/* =========================================================
   PRIMERA PANTALLA
   ========================================================= */

/* =========================================================
   TEMAS

   El MODO OSCURO es el tema original de la app: los valores
   de :root son los mismos de siempre, solo que ahora tienen
   nombre. El MODO CLARO (azul sobre blanco) esta al final de
   este bloque y unicamente cambia esos valores.
   ========================================================= */

:root {

    /* --- Primera pantalla --- */
    --bg: #050810;
    --card: #0c1426;
    --card-border: rgba(96, 140, 255, 0.25);
    --blue: #3b82f6;
    --blue-deep: #1e40af;
    --text: #eef2ff;
    --text-dim: #8b9ac2;
    --faint: rgba(140, 170, 255, 0.28);

    --star: #fff;
    --card-bg: rgba(12, 20, 38, 0.85);
    --card-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    --field: rgba(255, 255, 255, 0.04);
    --error: #f0709a;
    --quote-strong: #5b9dff;

    /* Dibujos del fondo: pendulo, onda, angulo, galaxia, planeta */
    --wire: #5b6a8c;
    --wire-2: #8b9ac2;
    --wire-3: #3b4a6b;
    --support: #7f8ca8;
    --ball-a: #6b7a99;
    --ball-b: #1c2536;
    --planet: #111a2e;
    --spark: #dce6ff;

    /* --- Panel del estudiante --- */
    --d-bg: #030711;
    --d-halo-1: rgba(20, 73, 150, .12);
    --d-halo-2: rgba(20, 90, 190, .08);
    --d-text: #e8efff;
    --line: rgba(70, 120, 210, .15);

    --side-a: #071020;
    --side-b: #050b17;
    --side-item: #8e9dbb;
    --side-item-hover: #ffffff;
    --side-hover: rgba(40, 100, 190, .15);
    --active-a: #0e55a5;
    --active-b: #073a79;
    --active-border: #1262bb;
    --active-text: #fff;
    --quote-bg: rgba(5, 16, 32, .5);
    --quote-border: rgba(63, 105, 177, .2);
    --quote-name: #488ce8;

    --panel-a: #08152a;
    --panel-b: #071122;
    --panel-border: rgba(53, 100, 171, .27);
    --panel-border-2: rgba(53, 100, 171, .25);
    --panel-hover: #1c65b8;
    --panel-shadow: none;
    --card-a: #081427;
    --card-b: #06101f;

    --chip-bg: #0b172b;
    --chip-border: rgba(91, 135, 210, .28);
    --accent-text: #318bf2;

    --points-border: rgba(48, 110, 205, .42);
    --points-a: rgba(10, 26, 54, .8);
    --points-b: rgba(4, 12, 26, .7);
    --star-border: #806300;
    --star-a: #4b3900;
    --star-b: #0b101c;
    --star-color: #ffd21a;
    --profile-a: #142744;
    --profile-b: #07101e;
    --profile-color: #79a6ee;

    --hero-a: #061327;
    --hero-b: #091b38;
    --hero-c: #071325;
    --hero-border: rgba(44, 100, 188, .42);
    --hero-glow-1: rgba(33, 112, 255, .2);
    --hero-glow-2: rgba(119, 52, 255, .2);
    --hero-ring: rgba(71, 139, 255, .45);
    --hero-ring-2: rgba(87, 166, 255, .7);
    --hero-formula: rgba(151, 185, 244, .35);
    --btn-a: #0874e8;
    --btn-b: #1553d0;

    --chevron: #508bd7;
    --link: #3286e9;

    --track: #101f38;
    --track-2: #14253e;
    --fill-a: #087df0;
    --fill-b: #1960d9;
    --fill-solid: #1785ed;
    --ring-fill: #1588f5;
    --ring-track: #15263d;
    --ring-hole: #071325;

    --sim-img-border: rgba(53, 105, 180, .3);
    --sim-btn-bg: #063269;
    --sim-btn-border: #0a4c99;
    --sim-btn-text: #d6e8ff;
    --more-bg: #06326a;
    --more-border: #0a4a95;
    --more-text: #c4ddff;

    --rank-line: rgba(70, 110, 170, .08);
    --rank-num: #25344c;
    --rank-num-text: #fff;
    --rank-cur-bg: rgba(16, 93, 188, .38);
    --rank-cur-text: #64a7ff;

    --achv-1: #6f39bb;
    --achv-1a: #26104b;
    --achv-1b: #0a1020;
    --achv-1t: #aa76ef;
    --achv-2: #087fe1;
    --achv-2a: #092f59;
    --achv-2b: #071020;
    --achv-2t: #419ce9;
    --achv-3: #24a54e;
    --achv-3a: #073c24;
    --achv-3b: #071020;
    --achv-3t: #45c678;

    --logout-text: #72839e;
    --logout-border: rgba(80, 115, 165, .2);

    /* Textos secundarios, por sitio */
    --txt-logo: #7083a8;
    --txt-side-quote: #a9b6ce;
    --txt-chip: #a7b8d6;
    --txt-welcome: #aab5ca;
    --txt-points: #a5afc3;
    --txt-hero: #9caaca;
    --txt-sec: #b8c3d9;
    --txt-topic: #8796b1;
    --txt-progress: #a8b4c9;
    --txt-sim: #8190aa;
    --txt-ring: #b6c1d4;
    --txt-info: #98a6bd;
    --txt-rank: #9aa8c0;
    --txt-achv: #8c9ab2;
}


/* ---------------------------------------------------------
   MODO CLARO: azul con predominio del blanco
   --------------------------------------------------------- */

:root[data-tema="claro"] {

    --bg: #f2f6fd;
    --card: #ffffff;
    --card-border: rgba(37, 99, 235, 0.18);
    --blue: #2563eb;
    --blue-deep: #1d4ed8;
    --text: #0e1a35;
    --text-dim: #5c6b8f;
    --faint: rgba(37, 99, 235, 0.22);

    --star: rgba(37, 99, 235, 0.30);
    --card-bg: rgba(255, 255, 255, 0.92);
    --card-shadow: 0 20px 50px rgba(37, 99, 235, 0.13);
    --field: #f5f8ff;
    --error: #d6336c;
    --quote-strong: #1d4ed8;

    --wire: #9fb6de;
    --wire-2: #5c7fb8;
    --wire-3: #c3d3ee;
    --support: #a9bcdd;
    --ball-a: #dbe6f8;
    --ball-b: #8ea7cf;
    --planet: #e8effb;
    --spark: #2563eb;

    --d-bg: #f4f8ff;
    --d-halo-1: rgba(37, 99, 235, .10);
    --d-halo-2: rgba(59, 130, 246, .07);
    --d-text: #0e1a35;
    --line: rgba(37, 99, 235, .14);

    --side-a: #ffffff;
    --side-b: #f3f7ff;
    --side-item: #54648c;
    --side-item-hover: #0e1a35;
    --side-hover: rgba(37, 99, 235, .09);
    --active-a: #2563eb;
    --active-b: #1d4ed8;
    --active-border: #1d4ed8;
    --active-text: #ffffff;
    --quote-bg: #f4f8ff;
    --quote-border: rgba(37, 99, 235, .16);
    --quote-name: #1d4ed8;

    --panel-a: #ffffff;
    --panel-b: #fbfdff;
    --panel-border: rgba(37, 99, 235, .16);
    --panel-border-2: rgba(37, 99, 235, .16);
    --panel-hover: #2563eb;
    --panel-shadow: 0 2px 10px rgba(37, 99, 235, .07);
    --card-a: #ffffff;
    --card-b: #f8fbff;

    --chip-bg: #ffffff;
    --chip-border: rgba(37, 99, 235, .20);
    --accent-text: #1d63d8;

    --points-border: rgba(37, 99, 235, .22);
    --points-a: #ffffff;
    --points-b: #eef4ff;
    --star-border: #e5b53c;
    --star-a: #fff7db;
    --star-b: #ffeeb8;
    --star-color: #c08a00;
    --profile-a: #eaf1ff;
    --profile-b: #dbe7ff;
    --profile-color: #2563eb;

    --hero-a: #e9f0ff;
    --hero-b: #dce9ff;
    --hero-c: #eef4ff;
    --hero-border: rgba(37, 99, 235, .22);
    --hero-glow-1: rgba(37, 99, 235, .14);
    --hero-glow-2: rgba(119, 52, 255, .10);
    --hero-ring: rgba(37, 99, 235, .35);
    --hero-ring-2: rgba(37, 99, 235, .55);
    --hero-formula: rgba(37, 99, 235, .28);
    --btn-a: #2563eb;
    --btn-b: #1d4ed8;

    --chevron: #2563eb;
    --link: #1d63d8;

    --track: #e3ebfa;
    --track-2: #e3ebfa;
    --fill-a: #3b82f6;
    --fill-b: #2563eb;
    --fill-solid: #2563eb;
    --ring-fill: #2563eb;
    --ring-track: #e3ebfa;
    --ring-hole: #ffffff;

    --sim-img-border: rgba(37, 99, 235, .20);
    --sim-btn-bg: #eaf1ff;
    --sim-btn-border: rgba(37, 99, 235, .28);
    --sim-btn-text: #1d4ed8;
    --more-bg: #eaf1ff;
    --more-border: rgba(37, 99, 235, .28);
    --more-text: #1d4ed8;

    --rank-line: rgba(37, 99, 235, .10);
    --rank-num: #dbe4f7;
    --rank-num-text: #34456f;
    --rank-cur-bg: rgba(37, 99, 235, .12);
    --rank-cur-text: #1d4ed8;

    --achv-1: rgba(124, 58, 237, .38);
    --achv-1a: #f3ecff;
    --achv-1b: #ffffff;
    --achv-1t: #6d28d9;
    --achv-2: rgba(37, 99, 235, .38);
    --achv-2a: #e8f1ff;
    --achv-2b: #ffffff;
    --achv-2t: #1d4ed8;
    --achv-3: rgba(22, 163, 74, .38);
    --achv-3a: #e6f8ee;
    --achv-3b: #ffffff;
    --achv-3t: #15803d;

    --logout-text: #6b7899;
    --logout-border: rgba(37, 99, 235, .18);

    --txt-logo: #8493b5;
    --txt-side-quote: #4a5a80;
    --txt-chip: #3a4d78;
    --txt-welcome: #6b7899;
    --txt-points: #6b7899;
    --txt-hero: #4a5a80;
    --txt-sec: #3a4d78;
    --txt-topic: #6b7899;
    --txt-progress: #6b7899;
    --txt-sim: #6b7899;
    --txt-ring: #6b7899;
    --txt-info: #6b7899;
    --txt-rank: #54648c;
    --txt-achv: #6b7899;
}

* {
    box-sizing: border-box;
    
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* ESTRELLAS */

.stars {
    position: fixed;
    inset: 0;
    background-image:
        radial-gradient(1.5px 1.5px at 10% 15%, var(--star) 100%, transparent),
        radial-gradient(1px 1px at 25% 60%, var(--star) 100%, transparent),
        radial-gradient(1.5px 1.5px at 70% 25%, var(--star) 100%, transparent),
        radial-gradient(1px 1px at 85% 70%, var(--star) 100%, transparent),
        radial-gradient(1px 1px at 45% 85%, var(--star) 100%, transparent),
        radial-gradient(1.5px 1.5px at 60% 10%, var(--star) 100%, transparent),
        radial-gradient(1px 1px at 92% 40%, var(--star) 100%, transparent);
    background-size: 100% 100%;
    opacity: 0.5;
    z-index: 0;
    animation: twinkle 4s ease-in-out infinite alternate;
}

@keyframes twinkle {
    0% {
        opacity: 0.35;
    }

    100% {
        opacity: 0.7;
    }
}

.decor {
    position: fixed;
    z-index: 0;
    color: var(--faint);
    pointer-events: none;
    transition: transform 0.15s ease-out;
}

.decor svg {
    display: block;
}

.decor.formula {
    font-family: 'Inter', sans-serif;
    font-size: 1.5rem;
    font-style: italic;
    color: var(--faint);
}

/* Los SVG del fondo llevan el color escrito dentro del propio dibujo:
   aqui se vuelven a pintar segun el tema, sin tocar el HTML. */

.decor svg [stroke="#5b6a8c"] {
    stroke: var(--wire);
}

.decor svg [stroke="#8b9ac2"] {
    stroke: var(--wire-2);
}

.decor svg [fill="#8b9ac2"] {
    fill: var(--wire-2);
}

.decor svg [stroke="#3b4a6b"] {
    stroke: var(--wire-3);
}

.decor svg [fill="#111a2e"] {
    fill: var(--planet);
}

.decor svg [fill="#dce6ff"] {
    fill: var(--spark);
}

.float-1 {
    animation: float-a 6s ease-in-out infinite;
}

.float-2 {
    animation: float-b 7s ease-in-out infinite;
}

@keyframes float-a {

    0%,
    100% {
        margin-top: 0;
    }

    50% {
        margin-top: -10px;
    }
}

@keyframes float-b {

    0%,
    100% {
        margin-top: 0;
    }

    50% {
        margin-top: 10px;
    }
}

.galaxy-spin {
    animation: spin 18s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@media (prefers-reduced-motion: reduce) {

    .stars,
    .float-1,
    .float-2,
    .galaxy-spin {
        animation: none;
    }

    .decor {
        transition: none;
    }
}

.pendulum {
    top: 2%;
    left: 1%;
}

.cradle {
    position: relative;
    width: 210px;
    height: 150px;
}

.cradle .support {
    position: absolute;
    top: 0;
    left: 0;
    width: 200px;
    height: 5px;
    background: var(--support);
    border-radius: 3px;
}

.cradle .string-ball {
    position: absolute;
    top: 5px;
    width: 2px;
    transform-origin: top center;
}

.cradle .string-ball .string {
    width: 1.5px;
    height: 88px;
    background: var(--wire);
    margin: 0 auto;
}

.cradle .string-ball .ball {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    margin: -2px auto 0;
    background: radial-gradient(circle at 35% 30%, var(--ball-a), var(--ball-b));
}

.cradle .a1 {
    left: 8px;
}

.cradle .a2 {
    left: 40px;
}

.cradle .a3 {
    left: 72px;
}

.cradle .a4 {
    left: 104px;
}

.cradle .a5 {
    left: 136px;
}

@keyframes swing-left {
    0% {
        transform: rotate(0deg);
    }

    18% {
        transform: rotate(-30deg);
    }

    36% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(0deg);
    }
}

@keyframes swing-right {
    0% {
        transform: rotate(0deg);
    }

    50% {
        transform: rotate(0deg);
    }

    68% {
        transform: rotate(30deg);
    }

    86% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(0deg);
    }
}

.cradle .swing-left {
    animation: swing-left 3.2s ease-in-out infinite;
}

.cradle .swing-right {
    animation: swing-right 3.2s ease-in-out infinite;
}

.wave {
    top: 22%;
    left: 3%;
    width: 230px;
    opacity: 0.6;
}

.angle {
    top: 32%;
    right: 6%;
    width: 230px;
}

.galaxy {
    top: 2%;
    right: 2%;
    width: 260px;
}

.planet {
    bottom: 2%;
    right: 1%;
    width: 300px;
}

.f-ma {
    top: 12%;
    left: 16%;
}

.e-mc2 {
    top: 56%;
    left: 4%;
    font-size: 2rem;
}

.p-mv {
    top: 70%;
    left: 12%;
}

.sum-f {
    top: 88%;
    left: 7%;
}

.vf {
    top: 6%;
    right: 22%;
}

.ek {
    top: 44%;
    right: 15%;
}

/* CONTENEDOR DE REGISTRO */

#registroPage {
    position: relative;
    z-index: 2;
    min-height: 100vh;
}

#registroPage main {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1.2rem 1.5rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    margin-bottom: 0.4rem;
}

.brand h1 {
    font-size: clamp(1.6rem, 4vw, 2.3rem);
    font-weight: 700;
    letter-spacing: 0.06em;
    margin: 0;
}

.tagline {
    font-size: 0.78rem;
    letter-spacing: 0.16em;
    color: var(--text-dim);
    text-transform: uppercase;
    margin: 0 0 1.3rem;
}

.card {
    width: 100%;
    max-width: 460px;
    background: var(--card-bg);
    backdrop-filter: blur(6px);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 1.7rem 2.2rem 1.6rem;
    box-shadow: var(--card-shadow);
}

.card-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1.5px solid var(--blue);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.8rem;
}

.card h2 {
    text-align: center;
    font-size: 1.3rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
}

.underline {
    width: 44px;
    height: 3px;
    background: var(--blue);
    border-radius: 2px;
    margin: 0 auto 1.4rem;
}

#registroPage label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.6rem;
    color: var(--text);
}

#registroPage label svg {
    flex-shrink: 0;
}

#registroPage input[type="text"] {
    width: 100%;
    background: var(--field);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 0.85rem 1rem;
    font-size: 0.95rem;
    color: var(--text);
    font-family: 'Inter', sans-serif;
    margin-bottom: 1.1rem;
    text-transform: uppercase;
}

#registroPage input[type="text"]::placeholder {
    color: var(--text-dim);
}

#registroPage input[type="text"]:focus {
    outline: none;
    border-color: var(--blue);
}

.grado-group {
    display: flex;
    gap: 0.7rem;
    margin-bottom: 0.4rem;
}

.grado-btn {
    flex: 1;
    padding: 0.85rem 0;
    background: var(--field);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

.grado-btn:hover {
    border-color: var(--blue);
}

.grado-btn.selected {
    background: linear-gradient(180deg, var(--blue), var(--blue-deep));
    border-color: var(--blue);
    color: #fff;
}

.error {
    font-size: 0.78rem;
    color: var(--error);
    margin: -1.2rem 0 1.2rem;
    display: none;
}

.error.mostrar {
    display: block;
}

.error-grado {
    margin-top: 0.4rem;
    margin-bottom: 1rem;
}

.continuar {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.95rem 0;
    background: linear-gradient(90deg, var(--blue), var(--blue-deep));
    border: none;
    border-radius: 10px;
    color: #fff;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    margin-top: 0.4rem;
}

.quote {
    text-align: center;
    max-width: 420px;
    margin-top: 1.2rem;
    font-size: 0.85rem;
    color: var(--text-dim);
}

.quote strong {
    display: block;
    color: var(--quote-strong);
    font-weight: 500;
    margin-top: 0.2rem;
}

@media (max-width:520px) {
    .decor {
        display: none;
    }
}


/* =========================================================
   SEGUNDA PANTALLA - DASHBOARD
   ========================================================= */

#dashboardPage {
    display: none;
    min-height: 100vh;
    background:
        radial-gradient(circle at 55% 15%, var(--d-halo-1), transparent 30%),
        radial-gradient(circle at 90% 70%, var(--d-halo-2), transparent 30%),
        var(--d-bg);
    color: var(--d-text);
    font-family: 'Inter', sans-serif;
}

.dashboard {
    min-height: 100vh;
    display: flex;
}

/* SIDEBAR */

.sidebar {
    width: 205px;
    min-width: 205px;
    background: linear-gradient(180deg, var(--side-a), var(--side-b));
    border-right: 1px solid var(--line);
    padding: 18px 10px;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 20;
}

.side-logo {
    padding: 4px 3px 18px;
    text-align: center;
}

.side-logo .atom {
    width: 44px;
    height: 44px;
    margin: auto;
}

.side-logo h2 {
    font-family: Georgia, 'Times New Roman', Times, serif;
    font-size: 25px;
    letter-spacing: -1px;
    margin: -1px 0 4px;
    font-weight: 500;
}

.side-logo p {
    font-size: 11px;
    color: var(--txt-logo);
    letter-spacing: .08em;
    margin: 0;
}

.side-menu {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 5px;
}

.side-item {
    min-height: 40px;
    padding: 0 10px;
    border-radius: 7px;
    border: 1px solid transparent;
    display: flex;
    align-items: center;
    gap: 11px;
    color: var(--side-item);
    font-size: 16px;
    cursor: pointer;
    transition: .2s;
}

.side-item svg {
    width: 19px;
    height: 19px;
    flex-shrink: 0;
}

.side-item:hover {
    color: var(--side-item-hover);
    background: var(--side-hover);
}

.side-item.active {
    color: var(--active-text);
    background: linear-gradient(90deg, var(--active-a), var(--active-b));
    border-color: var(--active-border);
    box-shadow: 0 0 18px rgba(0, 110, 255, .12);
}

.side-quote {
    margin: auto 5px 2px;
    padding: 18px 14px;
    border: 1px solid var(--quote-border);
    border-radius: 8px;
    background: var(--quote-bg);
    color: var(--txt-side-quote);
    font-size: 13.5px;
    line-height: 1.55;
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
}

.side-quote strong {
    display: block;
    margin-top: 16px;
    color: var(--quote-name);
    font-size: 11.5px;
    font-weight: 400;
}

/* CONTENIDO */

.dashboard-main {
    margin-left: 205px;
    width: calc(100% - 205px);
    padding: 20px 26px;
    min-height: 100vh;
}

.topbar {
    min-height: 68px;
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
}

.student-info {
    flex: 1;
}

.welcome {
    font-size: 17px;
    color: var(--txt-welcome);
    margin-bottom: 2px;
}

.student-name {
    font-size: 16px;
    font-weight: 600;
}

.student-grade {
    color: var(--accent-text);
    font-size: 13.5px;
    margin-top: 3px;
}

.points-box {
    width: 268px;
    min-height: 74px;
    border: 1px solid var(--points-border);
    border-radius: 9px;
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 8px 13px;
    background: linear-gradient(135deg, var(--points-a), var(--points-b));
}

.star-circle {
    width: 47px;
    height: 47px;
    border-radius: 50%;
    border: 2px solid var(--star-border);
    background: radial-gradient(circle, var(--star-a), var(--star-b) 65%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 27px;
    color: var(--star-color);
    box-shadow: 0 0 15px rgba(255, 205, 0, .15);
}

.points-label {
    font-size: 11px;
    color: var(--txt-points);
    letter-spacing: .04em;
}

.points-number {
    font-size: 21px;
    margin: 2px 0;
    font-weight: 500;
}

.points-text {
    font-size: 11px;
    color: var(--txt-points);
}

.profile-circle {
    width: 42px;
    height: 42px;
    margin-left: 5px;
    padding: 0;
    flex-shrink: 0;
    border: 1px solid transparent;
    border-radius: 50%;
    background: linear-gradient(145deg, var(--profile-a), var(--profile-b));
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--profile-color);
    cursor: pointer;
    transition: border-color .18s, transform .18s;
}

.profile-circle:hover {
    border-color: var(--panel-hover);
    transform: scale(1.06);
}

.profile-circle:focus-visible {
    outline: 2px solid var(--panel-hover);
    outline-offset: 2px;
}

/* Mientras se está viendo el perfil, el botón queda marcado */

.profile-circle.perfil-abierto {
    border-color: var(--active-border);
    box-shadow: 0 0 0 3px var(--rank-cur-bg);
}

@media (prefers-reduced-motion: reduce) {

    .profile-circle:hover {
        transform: none;
    }

}

.profile-circle svg {
    width: 25px;
}

/* GRID PRINCIPAL */

.content-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 12px;
}

.left-content {
    min-width: 0;
}

.right-content {
    min-width: 0;
}

/* HERO */

.hero {
    min-height: 178px;
    border-radius: 8px;
    border: 1px solid var(--hero-border);
    background:
        radial-gradient(circle at 75% 50%, var(--hero-glow-1), transparent 25%),
        radial-gradient(circle at 80% 45%, var(--hero-glow-2), transparent 12%),
        linear-gradient(110deg, var(--hero-a), var(--hero-b) 48%, var(--hero-c));
    position: relative;
    overflow: hidden;
    padding: 27px 29px;
}

.hero:before {
    content: "";
    position: absolute;
    width: 310px;
    height: 310px;
    right: -20px;
    top: -75px;
    border: 1px solid var(--hero-ring);
    border-radius: 50%;
    transform: rotate(-20deg);
    box-shadow:
        0 0 18px rgba(30, 120, 255, .25),
        inset 0 0 25px rgba(30, 120, 255, .15);
}

.hero:after {
    content: "";
    position: absolute;
    width: 170px;
    height: 170px;
    right: 40px;
    top: -3px;
    border: 2px solid var(--hero-ring-2);
    border-radius: 50%;
    transform: rotate(48deg) scaleX(.35);
    box-shadow: 0 0 15px #2088ff;
}

.hero h1 {
    margin: 0 0 7px;
    font-size: 23px;
    font-weight: 600;
    position: relative;
    z-index: 2;
}

.hero p {
    max-width: 400px;
    margin: 0;
    color: var(--txt-hero);
    font-size: 15.5px;
    line-height: 1.5;
    position: relative;
    z-index: 2;
}

.hero-button {
    margin-top: 14px;
    min-height: 34px;
    border: 0;
    border-radius: 5px;
    padding: 0 14px;
    background: linear-gradient(90deg, var(--btn-a), var(--btn-b));
    color: #fff;
    font-size: 13.5px;
    cursor: pointer;
    position: relative;
    z-index: 3;
    box-shadow: 0 4px 12px rgba(0, 90, 255, .2);
}

.formula-hero {
    position: absolute;
    color: var(--hero-formula);
    font-size: 19px;
    font-style: italic;
}

.formula-one {
    top: 9px;
    left: 48%;
}

.formula-two {
    bottom: 8px;
    left: 53%;
}

/* SECCIONES */

.section-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 15px 0 7px;
    color: var(--txt-sec);
    font-size: 16px;
}

.section-title span:first-child:before {
    content: "›";
    color: var(--chevron);
    font-size: 20px;
    margin-right: 6px;
}

.view-all {
    color: var(--link);
    font-size: 14.5px;
    cursor: pointer;
}

/* TEMAS */

.topic-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.topic-card {
    min-width: 0;
    min-height: 200px;
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border: 1px solid var(--panel-border);
    border-radius: 7px;
    overflow: hidden;
    box-shadow: var(--panel-shadow);
    display: flex;
    flex-direction: column;
    transition: .2s;
}

.topic-card:hover,
.sim-card:hover {
    transform: translateY(-2px);
    border-color: var(--panel-hover);
}

.topic-image {
    height: 88px;
    position: relative;
    overflow: hidden;
    background: #081325;
}

.topic-image:before {
    content: "";
    position: absolute;
    inset: 0;
}

.mechanics:before {
    background:
        repeating-linear-gradient(100deg, transparent 0 16px, rgba(180, 200, 220, .12) 17px 18px),
        linear-gradient(120deg, #0a0d14, #161b26);
}

.waves:before {
    background:
        repeating-radial-gradient(ellipse at center, rgba(20, 123, 255, .75) 0 1px, transparent 2px 12px),
        radial-gradient(circle, #032a65, #020b1c);
}

.optics:before {
    background:
        linear-gradient(125deg, transparent 45%, #b5d5ff 46%, #fff 48%, #20b7ff 50%, transparent 53%),
        linear-gradient(140deg, #071425, #102544);
}

.electricity:before {
    background:
        radial-gradient(circle at 50% 50%, #a5ddff 0 2px, transparent 3px),
        repeating-linear-gradient(35deg, transparent 0 12px, rgba(56, 131, 255, .2) 13px 14px),
        #071438;
}

.topic-info {
    padding: 10px 12px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.topic-info h3 {
    font-size: 13.5px;
    margin: 0 0 5px;
    font-weight: 500;
}

.topic-info p {
    margin: 0;
    min-height: 32px;
    color: var(--txt-topic);
    font-size: 11px;
    line-height: 1.35;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    color: var(--txt-progress);
    font-size: 11px;
    margin-top: auto;
    padding-top: 7px;
}

.progress {
    height: 4px;
    border-radius: 10px;
    background: var(--track);
    margin-top: 5px;
    overflow: hidden;
}

.progress span {
    display: block;
    height: 100%;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--fill-a), var(--fill-b));
}

/* SIMULADORES */

.sim-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.sim-card {
    min-height: 172px;
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 7px;
    padding: 7px;
    box-shadow: var(--panel-shadow);
    display: flex;
    flex-direction: column;
    transition: .2s;
}

.sim-image {
    height: 69px;
    border-radius: 4px;
    border: 1px solid var(--sim-img-border);
    position: relative;
    overflow: hidden;
    background: #061329;
}

.sim-title {
    font-size: 11.5px;
    margin: 6px 2px 2px;
}

.sim-description {
    font-size: 10px;
    color: var(--txt-sim);
    min-height: 22px;
    margin: 0 2px;
}

.sim-button {
    width: 100%;
    min-height: 30px;
    margin-top: auto;
    background: var(--sim-btn-bg);
    border: 1px solid var(--sim-btn-border);
    color: var(--sim-btn-text);
    border-radius: 4px;
    font-size: 11px;
    cursor: pointer;
}

/* DIBUJOS DE SIMULADORES */

/* Ondas sonoras: la bocina y las bandas de aire comprimido que salen de ella. */
.sound-sim:before {
    content: "🔊";
    position: absolute;
    left: 11px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 24px;
    filter: drop-shadow(0 0 7px #1683ff);
}

.sound-sim:after {
    content: "";
    position: absolute;
    left: 44px;
    right: 8px;
    top: 50%;
    height: 38px;
    transform: translateY(-50%);
    background: repeating-linear-gradient(90deg,
        #247eff 0 2px,
        rgba(36, 126, 255, .25) 2px 5px,
        transparent 5px 11px);
    -webkit-mask-image: linear-gradient(90deg, #000 55%, transparent);
    mask-image: linear-gradient(90deg, #000 55%, transparent);
    animation: sonido-avanza 1.1s linear infinite;
}

@keyframes sonido-avanza {
    to { background-position: 11px 0; }
}

/* Reflexion y refraccion: la superficie del agua, el rayo que entra
   y el que se dobla al pasar al otro medio. */
.luz-sim {
    background-image: linear-gradient(180deg, rgba(36, 126, 255, .38), rgba(9, 52, 122, .75));
    background-size: 100% 50%;
    background-position: 0 100%;
    background-repeat: no-repeat;
}

.luz-sim:before {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 54px;
    margin-left: -54px;
    height: 0;
    border-top: 2px solid #ffd65b;
    transform-origin: right center;
    transform: rotate(34deg);
    box-shadow: 0 0 8px rgba(255, 214, 91, .55);
}

.luz-sim:after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 46px;
    height: 0;
    border-top: 2px solid rgba(255, 214, 91, .8);
    transform-origin: left center;
    transform: rotate(62deg);
    box-shadow: 0 0 8px rgba(255, 214, 91, .35);
}

/* Óptica: una lente y los tres rayos principales que la atraviesan. */
.optics-sim:before {
    content: "";
    position: absolute;
    left: 50%;
    top: 11px;
    bottom: 11px;
    width: 17px;
    margin-left: -8px;
    border-radius: 50%;
    border: 1px solid #67b6ff;
    background: rgba(103, 182, 255, .22);
}

.optics-sim:after {
    content: "";
    position: absolute;
    left: 12px;
    right: 12px;
    top: 50%;
    border-top: 1px solid #ffd65b;
    box-shadow:
        0 -15px 0 -0.5px rgba(255, 214, 91, .7),
        0 15px 0 -0.5px rgba(255, 214, 91, .7);
}

/* Gravedad: dos masas y la linea que las une. */
.gravity-sim {
    background-image: repeating-linear-gradient(90deg,
        rgba(140, 180, 255, .45) 0 6px,
        transparent 6px 13px);
    background-size: 100% 1px;
    background-position: 0 50%;
    background-repeat: no-repeat;
}

.gravity-sim:before {
    content: "";
    position: absolute;
    left: 26px;
    top: 50%;
    width: 15px;
    height: 15px;
    margin-top: -7px;
    border-radius: 50%;
    background: #5b9dff;
    box-shadow: 0 0 12px rgba(91, 157, 255, .65);
}

.gravity-sim:after {
    content: "";
    position: absolute;
    right: 24px;
    top: 50%;
    width: 29px;
    height: 29px;
    margin-top: -14px;
    border-radius: 50%;
    background: #d07a21;
    box-shadow: 0 0 16px rgba(208, 122, 33, .5);
}

/* Densidad: el liquido del recipiente y tres bloques a distinta altura. */
.density-sim:before {
    content: "";
    position: absolute;
    left: 13px;
    right: 13px;
    bottom: 7px;
    height: 33px;
    border-top: 2px solid #67b6ff;
    border-radius: 2px;
    background: linear-gradient(180deg, rgba(36, 126, 255, .5), rgba(9, 52, 122, .8));
}

.density-sim:after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 30px;
    width: 20px;
    height: 20px;
    margin-left: -10px;
    border-radius: 3px;
    background: #ffb84d;
    box-shadow:
        0 0 10px rgba(255, 184, 77, .45),
        -33px 14px 0 -3px #d07a21,
        33px 5px 0 -2px #8fc4ff;
}

.interference-sim:before,
.interference-sim:after {
    content: "";
    position: absolute;
    width: 145px;
    height: 48px;
    top: 10px;
    left: 3px;
    border-top: 2px solid #d07a21;
    border-radius: 50%;
    transform: skewY(-12deg);
}

.interference-sim:after {
    transform: skewY(12deg);
    border-color: #1688ff;
}

/* CARDS DA DIREITA */

.side-card {
    border: 1px solid var(--panel-border-2);
    background: linear-gradient(180deg, var(--card-a), var(--card-b));
    border-radius: 7px;
    padding: 13px 14px;
    margin-bottom: 9px;
    box-shadow: var(--panel-shadow);
}

.side-card h3 {
    margin: 0 0 9px;
    font-size: 13.5px;
    font-weight: 600;
}

.circle-progress {
    width: 92px;
    height: 92px;
    border-radius: 50%;
    margin: 2px auto 9px;
    background: conic-gradient(var(--ring-fill) 0deg 252deg, var(--ring-track) 252deg 360deg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.circle-progress:after {
    content: "";
    position: absolute;
    inset: 8px;
    background: var(--ring-hole);
    border-radius: 50%;
}

.circle-progress strong {
    position: relative;
    z-index: 2;
    font-size: 19px;
}

.circle-progress small {
    position: absolute;
    z-index: 2;
    margin-top: 34px;
    font-size: 9.5px;
    color: var(--txt-ring);
}

.progress-info {
    color: var(--txt-info);
    font-size: 11px;
    margin-bottom: 7px;
}

.side-big-progress {
    height: 4px;
    background: var(--track-2);
    border-radius: 5px;
    overflow: hidden;
}

.side-big-progress span {
    display: block;
    height: 100%;
    width: 70%;
    background: var(--fill-solid);
}

/* TABLA */

.rank {
    display: grid;
    grid-template-columns: 20px 1fr 45px;
    align-items: center;
    height: 30px;
    font-size: 11px;
    color: var(--txt-rank);
    border-bottom: 1px solid var(--rank-line);
}

.rank-number {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--rank-num);
    color: var(--rank-num-text);
}

.rank:first-of-type .rank-number {
    background: #846d00;
    color: #ffe25a;
}

.rank:nth-of-type(2) .rank-number {
    background: #727a85;
}

.rank:nth-of-type(3) .rank-number {
    background: #8c572a;
}

/* Plata y bronce: el numero va en blanco tambien en modo claro */

.rank:nth-of-type(2) .rank-number,
.rank:nth-of-type(3) .rank-number {
    color: #fff;
}

.rank.current {
    margin: 0 -5px;
    padding: 0 5px;
    border-radius: 4px;
    background: var(--rank-cur-bg);
    color: var(--rank-cur-text);
}

.rank-points {
    text-align: right;
}

.more-button {
    width: 100%;
    min-height: 32px;
    margin-top: 7px;
    border: 1px solid var(--more-border);
    background: var(--more-bg);
    border-radius: 4px;
    color: var(--more-text);
    font-size: 11px;
    cursor: pointer;
}

/* LOGROS */

.achievements {
    display: flex;
    justify-content: space-around;
    margin: 5px 0 8px;
}

.achievement {
    text-align: center;
    width: 31%;
}

.achievement-icon {
    width: 54px;
    height: 54px;
    margin: auto;
    border-radius: 50%;
    border: 1px solid var(--achv-1);
    background: radial-gradient(circle, var(--achv-1a), var(--achv-1b));
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 25px;
    box-shadow: 0 0 13px rgba(142, 65, 255, .16);
}

.achievement:nth-child(2) .achievement-icon {
    border-color: var(--achv-2);
    background: radial-gradient(circle, var(--achv-2a), var(--achv-2b));
}

.achievement:nth-child(3) .achievement-icon {
    border-color: var(--achv-3);
    background: radial-gradient(circle, var(--achv-3a), var(--achv-3b));
}

.achievement p {
    color: var(--txt-achv);
    font-size: 9.5px;
    line-height: 1.4;
    margin: 5px 0 0;
}

.achievement strong {
    display: block;
    color: var(--achv-1t);
    font-size: 9.5px;
}

.achievement:nth-child(2) strong {
    color: var(--achv-2t);
}

.achievement:nth-child(3) strong {
    color: var(--achv-3t);
}

/* BOTÓN DE VOLVER */

.logout-button {
    margin-top: 10px;
    width: 100%;
    min-height: 32px;
    border-radius: 5px;
    background: transparent;
    color: var(--logout-text);
    border: 1px solid var(--logout-border);
    cursor: pointer;
    font-size: 11px;
}

.logout-button:hover {
    color: var(--d-text);
    border-color: var(--panel-hover);
}


/* =========================================================
   RESPONSIVE
   ========================================================= */

@media(max-width:1050px) {

    .sidebar {
        width: 180px;
        min-width: 180px;
    }

    .dashboard-main {
        margin-left: 180px;
        width: calc(100% - 180px);
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .right-content {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }

    .right-content .side-card {
        margin: 0;
    }

}

@media(max-width:800px) {

    /* Sin botón de menú: la barra lateral se convierte en una
       fila horizontal arriba, que se desliza con el dedo. */

    .dashboard {
        flex-direction: column;
    }

    .sidebar {
        position: static;
        width: 100%;
        min-width: 0;
        flex-direction: row;
        align-items: center;
        gap: 10px;
        padding: 8px 10px;
        border-right: 0;
        border-bottom: 1px solid var(--line);
        overflow-x: auto;
    }

    .sidebar::-webkit-scrollbar {
        height: 3px;
    }

    .sidebar::-webkit-scrollbar-thumb {
        background: var(--panel-border);
        border-radius: 10px;
    }

    .side-logo {
        display: flex;
        align-items: center;
        gap: 7px;
        flex-shrink: 0;
        padding: 0 6px 0 2px;
    }

    .side-logo .atom {
        width: 26px;
        height: 26px;
        margin: 0;
    }

    .side-logo .atom svg {
        width: 26px;
        height: 26px;
    }

    .side-logo h2 {
        margin: 0;
        font-size: 17px;
    }

    .side-logo p {
        display: none;
    }

    .side-menu {
        flex-direction: row;
        margin-top: 0;
        gap: 4px;
    }

    .side-item {
        white-space: nowrap;
        flex-shrink: 0;
    }

    .side-quote {
        display: none;
    }

    .dashboard-main {
        margin-left: 0;
        width: 100%;
        padding: 12px;
    }

    .points-box {
        display: none;
    }

    .topic-grid,
    .sim-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .right-content {
        grid-template-columns: 1fr;
    }

}

@media(max-width:520px) {

    .dashboard-main {
        padding: 9px;
    }

    .topbar {
        height: 55px;
    }

    .student-name {
        font-size: 15.5px;
    }

    .hero {
        height: 190px;
        padding: 22px 18px;
    }

    .hero h1 {
        font-size: 20px;
    }

    .hero p {
        width: 75%;
        font-size: 12.5px;
    }

    .topic-grid,
    .sim-grid {
        grid-template-columns: 1fr;
    }

    .topic-card {
        height: 170px;
    }

    .sim-card {
        height: 145px;
    }

}

/* GALATCXIS · Inicio en celular: cuadrícula de 2 tarjetas por fila (temas y simuladores) */
@media(max-width:520px) {
    #vistaInicio .topic-grid,
    #vistaInicio .sim-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
    #vistaInicio .topic-card { height: auto; min-height: 0; }
    #vistaInicio .topic-image { height: 64px; }
    #vistaInicio .topic-info { padding: 8px 9px; }
    #vistaInicio .topic-info h3 { font-size: 12.5px; line-height: 1.25; }
    #vistaInicio .topic-info p { min-height: 0; font-size: 10.5px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
    #vistaInicio .sim-card { height: auto; min-height: 0; padding: 6px; }
    #vistaInicio .sim-image { height: 56px; }
    #vistaInicio .sim-title { font-size: 11.5px; line-height: 1.25; }
    #vistaInicio .sim-description { min-height: 0; font-size: 10px; line-height: 1.3; margin-bottom: 6px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
    #vistaInicio .sim-button { min-height: 30px; font-size: 10.5px; padding: 0 4px; }
}


/* =========================================================
   ANIMACIONES DEL DASHBOARD
   ========================================================= */

@keyframes dashboardAppear {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#dashboardPage.visible {
    animation: dashboardAppear .45s ease;
}

/* =========================================================
   BOTON DE MODO CLARO / OSCURO
   ========================================================= */

.tema-btn {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
    padding: 0;
    border-radius: 50%;
    border: 1px solid var(--card-border);
    background: var(--card-bg);
    color: var(--blue);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--panel-shadow);
    transition: transform .18s, border-color .18s;
}

.tema-btn:hover {
    border-color: var(--blue);
    transform: scale(1.07);
}

.tema-btn:focus-visible {
    outline: 2px solid var(--blue);
    outline-offset: 2px;
}

/* Icono: se muestra el del tema al que se va a cambiar */

.tema-btn .ico-luna {
    display: none;
}

:root[data-tema="claro"] .tema-btn .ico-sol {
    display: none;
}

:root[data-tema="claro"] .tema-btn .ico-luna {
    display: block;
}

/* En la pantalla de registro flota en la esquina */

.tema-registro {
    position: fixed;
    top: 18px;
    right: 18px;
    z-index: 5;
}

/* En el panel vive en la barra superior */

.tema-panel {
    margin-left: 5px;
    border-color: var(--chip-border);
    background: var(--chip-bg);
    color: var(--accent-text);
}

.tema-panel:hover {
    border-color: var(--panel-hover);
}

@media (prefers-reduced-motion: reduce) {

    .tema-btn:hover {
        transform: none;
    }

}

/* =========================================================
   TERCERA PANTALLA - ACERCA DE
   ========================================================= */

#acercaPage {
    display: none;
    position: relative;
    z-index: 2;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
}

.acerca-wrap {
    position: relative;
    z-index: 2;
    max-width: 640px;
    margin: 0 auto;
    padding: 2.6rem 1.5rem 3rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.acerca-version {
    align-self: center;
    margin-left: 0.2rem;
    padding: 2px 9px;
    border: 1px solid var(--card-border);
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--blue);
}

.acerca-card {
    width: 100%;
    background: var(--card-bg);
    backdrop-filter: blur(6px);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.4rem 1.6rem 1.5rem;
    margin-bottom: 0.9rem;
    box-shadow: var(--card-shadow);
}

.acerca-card h2 {
    font-size: 1.08rem;
    font-weight: 600;
    text-align: center;
    margin: 0 0 0.45rem;
}

.acerca-card .underline {
    margin-bottom: 1.1rem;
}

.acerca-texto {
    font-size: 0.88rem;
    line-height: 1.65;
    color: var(--text-dim);
    margin: 0 0 0.9rem;
}

.acerca-texto strong {
    color: var(--text);
    font-weight: 600;
}

.acerca-datos {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0 1.1rem;
    margin: 1.2rem 0 0;
    font-size: 0.85rem;
}

.acerca-datos dt {
    padding: 0.62rem 0;
    border-top: 1px solid var(--card-border);
    color: var(--blue);
    font-weight: 600;
    white-space: nowrap;
}

.acerca-datos dd {
    padding: 0.62rem 0;
    border-top: 1px solid var(--card-border);
    margin: 0;
    color: var(--text-dim);
}

.acerca-lista {
    margin: 0;
    padding: 0;
    list-style: none;
}

.acerca-lista li {
    position: relative;
    padding-left: 1.2rem;
    margin-bottom: 0.55rem;
    font-size: 0.86rem;
    line-height: 1.55;
    color: var(--text-dim);
}

.acerca-lista li:before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.62em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--blue);
}

.acerca-lista-proxima li:before {
    background: none;
    border: 1px solid var(--blue);
}

.acerca-sub {
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin: 1.3rem 0 0.7rem;
}

/* --- Compartir --- */

.acerca-enlace {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.acerca-enlace input {
    flex: 1;
    min-width: 0;
    background: var(--field);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 0.7rem 0.85rem;
    font-size: 0.82rem;
    color: var(--text-dim);
    font-family: 'Inter', sans-serif;
}

.acerca-enlace input:focus {
    outline: none;
    border-color: var(--blue);
}

.acerca-copiar {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0 1rem;
    background: linear-gradient(90deg, var(--blue), var(--blue-deep));
    border: none;
    border-radius: 10px;
    color: #fff;
    font-family: 'Inter', sans-serif;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
}

.acerca-nota {
    font-size: 0.76rem;
    line-height: 1.5;
    color: var(--text-dim);
    margin: 0 0 0.9rem;
    min-height: 1em;
}

.acerca-botones {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.share-btn {
    flex: 1;
    min-width: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.7rem 0.6rem;
    background: var(--field);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
}

.share-btn:hover {
    border-color: var(--blue);
    color: var(--blue);
}

.share-btn[hidden] {
    display: none;
}

.acerca-volver {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    margin-top: 0.7rem;
    padding: 0.6rem 1.1rem;
    background: transparent;
    border: 1px solid var(--card-border);
    border-radius: 10px;
    color: var(--text-dim);
    font-family: 'Inter', sans-serif;
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
}

.acerca-volver:hover {
    border-color: var(--blue);
    color: var(--text);
}

.acerca-copiar:focus-visible,
.share-btn:focus-visible,
.acerca-volver:focus-visible {
    outline: 2px solid var(--blue);
    outline-offset: 2px;
}

#acercaPage .quote {
    margin-top: 1.4rem;
}

@media (max-width:520px) {

    .acerca-wrap {
        padding: 1.8rem 1rem 2.4rem;
    }

    .acerca-card {
        padding: 1.2rem 1.1rem 1.3rem;
    }

    .acerca-datos {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .acerca-datos dd {
        border-top: 0;
        padding-top: 0;
    }

    .acerca-enlace {
        flex-direction: column;
    }

    .acerca-copiar {
        justify-content: center;
        padding: 0.7rem;
    }

}

/* =========================================================
   VISTAS DEL PANEL
   Inicio, Temas, Lectura, Simuladores, Mis Puntos,
   Logros, Perfil y Ajustes.
   ========================================================= */

.vista {
    display: none;
}

.vista.vista-activa {
    display: block;
    animation: vistaEntra .28s ease;
}

#vistaInicio.vista-activa {
    display: grid;
}

@keyframes vistaEntra {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sin-animacion *,
.sin-animacion *:before,
.sin-animacion *:after {
    animation: none !important;
    transition: none !important;
}

.vista-cabecera {
    margin-bottom: 14px;
}

.vista-cabecera h2 {
    margin: 0 0 4px;
    font-size: 21px;
    font-weight: 600;
}

.vista-cabecera p {
    margin: 0;
    max-width: 62ch;
    color: var(--txt-hero);
    font-size: 13.5px;
    line-height: 1.6;
}

.volver-btn {
    margin-bottom: 12px;
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    color: var(--txt-progress);
    font-family: 'Inter', sans-serif;
    font-size: 12.5px;
    cursor: pointer;
}

.volver-btn:hover {
    border-color: var(--panel-hover);
    color: var(--d-text);
}

.side-card-link {
    cursor: pointer;
}

.side-card-link:hover {
    border-color: var(--panel-hover);
}

.bloque {
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    padding: 14px 16px;
    box-shadow: var(--panel-shadow);
}

.bloque-titulo {
    margin: 0 0 10px;
    font-size: 14.5px;
    font-weight: 600;
}

.dos-columnas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 10px;
}

.vacio {
    margin: 0;
    color: var(--txt-topic);
    font-size: 12.5px;
    line-height: 1.6;
}


/* --------- Lista de temas --------- */

.lista-temas {
    display: grid;
    gap: 10px;
}

.tema-fila {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    box-shadow: var(--panel-shadow);
    transition: transform .18s, border-color .18s;
}

.tema-fila:hover {
    transform: translateY(-2px);
    border-color: var(--panel-hover);
}

.tema-fila:focus-visible,
.sim-ficha:focus-visible,
.topic-card:focus-visible,
.side-card-link:focus-visible,
.view-all:focus-visible {
    outline: 2px solid var(--panel-hover);
    outline-offset: 2px;
}

.tema-dibujo {
    position: relative;
    overflow: hidden;
    min-height: 128px;
    background: #081325;
}

.tema-dibujo:before {
    content: "";
    position: absolute;
    inset: 0;
}

.tema-cuerpo {
    padding: 13px 16px 15px;
    min-width: 0;
}

.tema-encabezado {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 4px;
}

.tema-encabezado h3 {
    margin: 0;
    font-size: 15.5px;
    font-weight: 600;
}

.tema-estado {
    flex-shrink: 0;
    padding: 2px 8px;
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    color: var(--txt-progress);
    font-size: 11px;
    letter-spacing: .04em;
    text-transform: uppercase;
}

.tema-estado.tema-listo {
    border-color: var(--achv-3);
    color: var(--achv-3t);
}

.tema-cuerpo>p {
    margin: 0 0 8px;
    color: var(--txt-topic);
    font-size: 12.5px;
    line-height: 1.5;
}

.tema-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 9px;
    color: var(--txt-progress);
    font-size: 11.5px;
}

.tema-meta span:before {
    content: "·  ";
    color: var(--chevron);
}


/* --------- Lectura de un tema --------- */

.lectura {
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    padding: 0 0 20px;
    overflow: hidden;
    box-shadow: var(--panel-shadow);
}

.lectura-portada {
    position: relative;
    height: 150px;
    overflow: hidden;
    background: #081325;
}

.lectura-portada:before {
    content: "";
    position: absolute;
    inset: 0;
}

.lectura-titulo {
    margin: 18px 26px 4px;
    font-size: 22px;
    font-weight: 600;
}

.lectura-resumen {
    margin: 0 26px 4px;
    color: var(--txt-hero);
    font-size: 13.5px;
}

.lectura-bloque {
    margin: 16px 26px 0;
    max-width: 74ch;
}

.lectura-bloque h3 {
    margin: 0 0 5px;
    font-size: 14.5px;
    font-weight: 600;
    color: var(--accent-text);
}

.lectura-bloque p {
    margin: 0;
    color: var(--txt-topic);
    font-size: 13.5px;
    line-height: 1.75;
}

.lectura-sub {
    margin: 24px 26px 10px;
    font-size: 13.5px;
    font-weight: 600;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--txt-progress);
}

.formulas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 8px;
    margin: 0 26px;
}

.formula-item {
    border: 1px solid var(--panel-border);
    border-radius: 7px;
    padding: 11px 13px;
    background: var(--card-a);
}

.formula-txt {
    display: block;
    margin-bottom: 4px;
    font-size: 16px;
    font-style: italic;
    color: var(--accent-text);
}

.formula-des {
    display: block;
    color: var(--txt-topic);
    font-size: 11.5px;
    line-height: 1.5;
}


/* --------- Preguntas --------- */

.preguntas {
    margin: 0 26px;
    display: grid;
    gap: 9px;
}

.pregunta {
    border: 1px solid var(--panel-border);
    border-left: 3px solid var(--panel-border);
    border-radius: 7px;
    padding: 12px 14px;
    background: var(--card-a);
}

.pregunta.preg-ok {
    border-left-color: var(--achv-3t);
}

.pregunta.preg-mal {
    border-left-color: var(--star-color);
}

.pregunta-txt {
    margin: 0 0 9px;
    font-size: 13.5px;
    line-height: 1.55;
}

.pregunta-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 17px;
    height: 17px;
    margin-right: 7px;
    border-radius: 50%;
    background: var(--rank-num);
    color: var(--rank-num-text);
    font-size: 11.5px;
}

.opciones {
    display: grid;
    gap: 6px;
}

.opcion {
    text-align: left;
    padding: 8px 11px;
    background: var(--field);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    color: var(--d-text);
    font-family: 'Inter', sans-serif;
    font-size: 12.5px;
    cursor: pointer;
    transition: border-color .15s, background .15s;
}

.opcion:hover:not(:disabled) {
    border-color: var(--panel-hover);
}

.opcion:disabled {
    cursor: default;
    opacity: .75;
}

.opcion.opcion-ok {
    border-color: var(--achv-3);
    background: var(--achv-3a);
    color: var(--achv-3t);
    opacity: 1;
}

.opcion.opcion-mal {
    border-color: var(--star-border);
    color: var(--star-color);
    opacity: 1;
}

.explicacion {
    margin: 9px 0 0;
    color: var(--txt-topic);
    font-size: 12px;
    line-height: 1.6;
}

.pie-nota {
    margin: 14px 26px 0;
    color: var(--txt-progress);
    font-size: 12.5px;
}

.pie-final {
    margin: 16px 26px 0;
    padding: 14px 16px;
    border: 1px solid var(--panel-border);
    border-radius: 7px;
    background: var(--card-a);
}

.pie-final strong {
    display: block;
    margin-bottom: 3px;
    font-size: 14.5px;
}

.pie-final p {
    margin: 0 0 10px;
    color: var(--txt-topic);
    font-size: 12.5px;
}


/* --------- Fichas de simuladores --------- */

.lista-sims {
    display: grid;
    gap: 10px;
}

.sim-ficha {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 14px;
    padding: 12px;
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    cursor: pointer;
    box-shadow: var(--panel-shadow);
    transition: border-color .18s, transform .18s;
}

.sim-ficha:hover {
    transform: translateY(-2px);
    border-color: var(--panel-hover);
}

.sim-ficha.resaltada {
    border-color: var(--panel-hover);
    box-shadow: 0 0 0 2px var(--rank-cur-bg);
}

.sim-ficha .sim-image {
    height: 100%;
    min-height: 104px;
}

.sim-ficha-cuerpo {
    min-width: 0;
    padding-right: 4px;
}

.sim-ficha-cuerpo>p {
    margin: 0 0 9px;
    color: var(--txt-topic);
    font-size: 12.5px;
}

.sim-datos {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0 14px;
    margin: 0;
    font-size: 12.5px;
}

.sim-datos dt {
    padding: 6px 0;
    border-top: 1px solid var(--panel-border);
    color: var(--accent-text);
    font-weight: 600;
    white-space: nowrap;
}

.sim-datos dd {
    margin: 0;
    padding: 6px 0;
    border-top: 1px solid var(--panel-border);
    color: var(--txt-topic);
    line-height: 1.55;
}

.sim-datos .sim-formula {
    font-style: italic;
    font-size: 14.5px;
    color: var(--d-text);
}


/* --------- Mis puntos --------- */

.puntos-cabecera {
    display: grid;
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
    gap: 10px;
    margin-bottom: 10px;
}

.puntos-grande,
.puntos-nivel {
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    padding: 16px 18px;
    box-shadow: var(--panel-shadow);
}

.puntos-cifra {
    display: block;
    font-size: 34px;
    font-weight: 600;
    line-height: 1.1;
    color: var(--star-color);
}

.puntos-lbl {
    display: block;
    margin-top: 2px;
    color: var(--txt-points);
    font-size: 11.5px;
    letter-spacing: .05em;
    text-transform: uppercase;
}

.puntos-nivel {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.nivel-nombre {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 9px;
}

.puntos-nivel .progress {
    margin: 0 0 7px;
}

.nivel-falta {
    color: var(--txt-progress);
    font-size: 12px;
}

.tabla-puntos {
    margin: 0;
    padding: 0;
    list-style: none;
}

.tabla-puntos li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 8px 0;
    border-bottom: 1px solid var(--rank-line);
    color: var(--txt-topic);
    font-size: 12.5px;
}

.tabla-puntos li:last-child {
    border-bottom: 0;
}

.tabla-puntos b {
    color: var(--achv-3t);
    font-weight: 600;
}

.actividad {
    margin: 0;
    padding: 0;
    list-style: none;
}

.actividad li {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    padding: 7px 0;
    border-bottom: 1px solid var(--rank-line);
    font-size: 12.5px;
    color: var(--txt-topic);
}

.actividad li:last-child {
    border-bottom: 0;
}

.actividad time {
    flex-shrink: 0;
    color: var(--txt-progress);
    font-size: 11px;
}


/* --------- Logros --------- */

.grid-logros {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
    gap: 10px;
}

.logro {
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    padding: 15px 14px 13px;
    text-align: center;
    box-shadow: var(--panel-shadow);
}

.logro-icono {
    width: 52px;
    height: 52px;
    margin: 0 auto 9px;
    border-radius: 50%;
    border: 1px solid var(--panel-border);
    background: var(--card-a);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 25px;
    filter: grayscale(1);
    opacity: .45;
}

.logro-ganado .logro-icono {
    border-color: var(--achv-1);
    background: radial-gradient(circle, var(--achv-1a), var(--achv-1b));
    filter: none;
    opacity: 1;
    box-shadow: 0 0 13px rgba(142, 65, 255, .16);
}

.logro h3 {
    margin: 0 0 3px;
    font-size: 13.5px;
    font-weight: 600;
}

.logro p {
    margin: 0 0 9px;
    color: var(--txt-achv);
    font-size: 11.5px;
    line-height: 1.45;
    min-height: 26px;
}

.logro-cuenta {
    display: block;
    margin-top: 6px;
    color: var(--txt-progress);
    font-size: 11px;
}

.logro-ganado .logro-cuenta {
    color: var(--achv-3t);
}

.achievement.bloqueado .achievement-icon {
    filter: grayscale(1);
    opacity: .4;
}


/* --------- Reto del día --------- */

/* Ilustración */

.reto-escena {
    position: relative;
    margin: 0 0 9px;
    padding: 6px 8px;
    border: 1px solid var(--panel-border);
    border-radius: 7px;
    background:
        radial-gradient(circle at 50% 120%, var(--d-halo-1), transparent 60%),
        var(--card-a);
    overflow: hidden;
}

.reto-escena.escena-ok {
    border-color: var(--achv-3);
}

.reto-escena.escena-mal {
    border-color: var(--star-border);
}

.esc {
    display: block;
    width: 100%;
    height: auto;
}

.esc .e-piso,
.esc .e-guia {
    stroke: var(--panel-border);
    stroke-width: 1.6;
    fill: none;
}

.esc .e-guia {
    stroke: var(--txt-progress);
    stroke-width: 1.2;
    opacity: .55;
}

.esc .e-cuerpo {
    fill: var(--panel-a);
    stroke: var(--chevron);
    stroke-width: 1.6;
    stroke-linejoin: round;
}

.esc .e-flecha {
    stroke: var(--star-color);
    stroke-width: 2;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.esc .e-onda,
.esc .e-arco,
.esc .e-traza {
    stroke: var(--accent-text);
    stroke-width: 1.6;
    fill: none;
    stroke-linecap: round;
}

.esc .e-rayo {
    stroke: var(--star-color);
    stroke-width: 2;
    stroke-linecap: round;
}

.esc .e-bola {
    fill: var(--accent-text);
}

.esc .e-punto {
    fill: var(--accent-text);
}

.esc .e-agua {
    fill: var(--rank-cur-bg);
    stroke: none;
}

.esc .e-estela {
    stroke: var(--txt-progress);
    stroke-width: 1.4;
    stroke-linecap: round;
    opacity: .5;
}

.esc .e-txt {
    fill: var(--txt-progress);
    font-family: 'Inter', sans-serif;
    font-size: 12.5px;
    font-style: italic;
}

/* Movimiento de las escenas */

.esc .e-empuja {
    animation: escEmpuje 2.4s ease-in-out infinite;
}

@keyframes escEmpuje {

    0%,
    100% {
        transform: translateX(-6px);
    }

    50% {
        transform: translateX(0);
    }
}

.esc .e-estela.e1 {
    animation: escFade 1.8s ease-in-out infinite;
}

.esc .e-estela.e2 {
    animation: escFade 1.8s ease-in-out .2s infinite;
}

.esc .e-estela.e3 {
    animation: escFade 1.8s ease-in-out .4s infinite;
}

@keyframes escFade {

    0%,
    100% {
        opacity: .18;
    }

    50% {
        opacity: .7;
    }
}

.esc .e-rebota {
    animation: escRebote 3s cubic-bezier(.4, 0, .6, 1) infinite;
}

@keyframes escRebote {
    0% {
        transform: translate(0, 0);
    }

    50% {
        transform: translate(104px, -2px);
    }

    100% {
        transform: translate(0, 0);
    }
}

.esc .e-arco {
    opacity: 0;
    animation: escPulso 2.4s ease-out infinite;
}

.esc .e-arco.a2 {
    animation-delay: .35s;
}

.esc .e-arco.a3 {
    animation-delay: .7s;
}

@keyframes escPulso {
    0% {
        opacity: 0;
    }

    30% {
        opacity: .85;
    }

    100% {
        opacity: 0;
    }
}

.esc .e-late {
    animation: escLate 1.6s ease-in-out infinite;
}

@keyframes escLate {

    0%,
    100% {
        opacity: .35;
    }

    50% {
        opacity: 1;
    }
}

.esc .e-onda.o1 {
    animation: escFade 2s ease-in-out infinite;
}

.esc .e-onda.o2 {
    animation: escFade 2s ease-in-out .25s infinite;
}

.esc .e-onda.o3 {
    animation: escFade 2s ease-in-out .5s infinite;
}

.esc .e-fluye {
    animation: escFluye 3s linear infinite;
}

.esc .e-fluye.p2 {
    animation-delay: 1s;
}

.esc .e-fluye.p3 {
    animation-delay: 2s;
}

@keyframes escFluye {
    0% {
        transform: translateX(0);
        opacity: 0;
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 1;
    }

    100% {
        transform: translateX(122px);
        opacity: 0;
    }
}

.esc .e-aguja {
    transform-origin: 100px 58px;
    animation: escAguja 3.4s ease-in-out infinite;
}

@keyframes escAguja {

    0%,
    100% {
        transform: rotate(-52deg);
    }

    50% {
        transform: rotate(46deg);
    }
}

.esc .e-cae {
    animation: escCae 2.6s ease-in infinite;
}

@keyframes escCae {
    0% {
        transform: translateY(0);
        opacity: 0;
    }

    12% {
        opacity: 1;
    }

    80% {
        transform: translateY(46px);
        opacity: 1;
    }

    100% {
        transform: translateY(46px);
        opacity: 0;
    }
}

.esc .e-traza {
    stroke-dasharray: 210;
    stroke-dashoffset: 210;
    animation: escTraza 3.2s ease-in-out infinite;
}

@keyframes escTraza {
    0% {
        stroke-dashoffset: 210;
    }

    55%,
    100% {
        stroke-dashoffset: 0;
    }
}

.esc .e-vuela {
    animation: escVuela 3.2s ease-in-out infinite;
}

@keyframes escVuela {
    0% {
        transform: translate(0, 0);
    }

    27% {
        transform: translate(72px, -52px);
    }

    55%,
    100% {
        transform: translate(144px, 0);
    }
}

.esc .e-oscila {
    transform-origin: 100px 14px;
    animation: escOscila 2.8s ease-in-out infinite;
}

@keyframes escOscila {

    0%,
    100% {
        transform: rotate(-22deg);
    }

    50% {
        transform: rotate(22deg);
    }
}

.esc .e-rueda {
    animation: escAvanza 3.4s ease-in-out infinite;
}

@keyframes escAvanza {

    0%,
    100% {
        transform: translateX(-10px);
    }

    50% {
        transform: translateX(18px);
    }
}

.esc .e-gira {
    transform-origin: 100px 46px;
    animation: escGira 5s linear infinite;
}

@keyframes escGira {
    from {
        transform: rotateY(0deg);
    }

    to {
        transform: rotateY(360deg);
    }
}

/* Etiquetas de tema y dificultad */

.reto-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 7px;
}

.reto-chip {
    padding: 2px 7px;
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    color: var(--txt-progress);
    font-size: 11px;
    letter-spacing: .04em;
    text-transform: uppercase;
}

.reto-chip.dif-facil {
    border-color: var(--achv-3);
    color: var(--achv-3t);
}

.reto-chip.dif-media {
    border-color: var(--star-border);
    color: var(--star-color);
}

.reto-chip.dif-dificil {
    border-color: var(--achv-1);
    color: var(--achv-1t);
}

/* Pregunta y opciones */

.reto-pregunta {
    margin: 0 0 9px;
    font-size: 13px;
    line-height: 1.55;
    color: var(--d-text);
}

.reto-opciones {
    display: grid;
    gap: 5px;
}

.reto-op {
    display: flex;
    align-items: center;
    gap: 8px;
    text-align: left;
    padding: 7px 9px;
    background: var(--field);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    color: var(--d-text);
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    cursor: pointer;
    transition: border-color .15s, transform .15s, background .15s;
}

.reto-op:hover:not(:disabled) {
    border-color: var(--panel-hover);
    transform: translateX(2px);
}

.reto-op:disabled {
    cursor: default;
}

.reto-letra {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--rank-num);
    color: var(--rank-num-text);
    font-size: 11px;
    font-weight: 600;
}

.reto-op-txt {
    min-width: 0;
}

.reto-op-ok {
    border-color: var(--achv-3);
    background: var(--achv-3a);
    color: var(--achv-3t);
}

.reto-op-ok .reto-letra {
    background: var(--achv-3);
    color: #fff;
}

.reto-op-mal {
    border-color: var(--star-border);
    color: var(--star-color);
}

.reto-op-mal .reto-letra {
    background: var(--star-border);
    color: #fff;
}

/* Resultado */

.reto-resultado {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 9px;
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    animation: retoEntra .35s ease;
}

.reto-resultado.res-ok {
    background: var(--achv-3a);
    color: var(--achv-3t);
}

.reto-resultado.res-mal {
    background: var(--star-a);
    color: var(--star-color);
}

@keyframes retoEntra {
    from {
        opacity: 0;
        transform: translateY(6px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.reto-marca {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12.5px;
    color: #fff;
}

.res-ok .reto-marca {
    background: var(--achv-3);
}

.res-mal .reto-marca {
    background: var(--star-border);
}

.reto-explica {
    margin: 8px 0 0;
    color: var(--txt-topic);
    font-size: 11.5px;
    line-height: 1.6;
}

/* Pie: racha, aciertos y cuenta regresiva */

.reto-pie {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 9px;
    padding-top: 8px;
    border-top: 1px solid var(--rank-line);
    color: var(--txt-progress);
    font-size: 11px;
}

.reto-cuenta {
    margin-left: auto;
    color: var(--accent-text);
}

/* Destello al responder */

.reto-flash-ok {
    animation: flashOk .7s ease;
}

.reto-flash-mal {
    animation: flashMal .7s ease;
}

@keyframes flashOk {

    0%,
    100% {
        filter: none;
    }

    35% {
        filter: brightness(1.25) saturate(1.3);
    }
}

@keyframes flashMal {

    0%,
    100% {
        transform: translateX(0);
    }

    20% {
        transform: translateX(-4px);
    }

    45% {
        transform: translateX(4px);
    }

    70% {
        transform: translateX(-2px);
    }
}

@media (prefers-reduced-motion: reduce) {

    .esc * {
        animation: none !important;
    }

    .reto-flash-ok,
    .reto-flash-mal,
    .reto-resultado {
        animation: none !important;
    }

}


/* --------- Perfil --------- */

.perfil-tarjeta {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 20px;
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    margin-bottom: 10px;
    box-shadow: var(--panel-shadow);
}

.perfil-avatar {
    flex-shrink: 0;
    width: 66px;
    height: 66px;
    border-radius: 50%;
    border: 2px solid var(--active-border);
    background: linear-gradient(145deg, var(--profile-a), var(--profile-b));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    font-weight: 600;
    color: var(--profile-color);
}

.perfil-datos h3 {
    margin: 0 0 2px;
    font-size: 19px;
    font-weight: 600;
}

.perfil-grado {
    margin: 0 0 9px;
    color: var(--accent-text);
    font-size: 12.5px;
}

.perfil-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.chip-perfil {
    padding: 3px 9px;
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    color: var(--txt-progress);
    font-size: 11.5px;
}

.grid-resumen {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 10px;
}

@media (max-width:900px) {

    .grid-resumen {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

}

@media (max-width:560px) {

    .grid-resumen {
        grid-template-columns: minmax(0, 1fr);
    }

}

/* Avance por tema, dentro del perfil */

.perfil-avance {
    margin-bottom: 10px;
}

.avance-fila {
    display: grid;
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr) 46px;
    align-items: center;
    gap: 14px;
    padding: 9px 0;
    border-bottom: 1px solid var(--rank-line);
    cursor: pointer;
}

.avance-fila:last-child {
    border-bottom: 0;
}

.avance-fila:hover .avance-nombre {
    color: var(--accent-text);
}

.avance-fila:focus-visible {
    outline: 2px solid var(--panel-hover);
    outline-offset: 2px;
}

.avance-nombre {
    font-size: 12.5px;
}

.avance-pct {
    text-align: right;
    color: var(--txt-progress);
    font-size: 12px;
    font-variant-numeric: tabular-nums;
}

@media (max-width:640px) {

    .avance-fila {
        grid-template-columns: minmax(0, 1fr) 46px;
    }

    .avance-fila .progress {
        grid-column: 1 / -1;
    }

}

.resumen-item {
    padding: 12px 14px;
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    box-shadow: var(--panel-shadow);
}

.resumen-lbl {
    display: block;
    margin-bottom: 3px;
    color: var(--txt-progress);
    font-size: 11px;
    letter-spacing: .04em;
    text-transform: uppercase;
}

.resumen-item strong {
    font-size: 17px;
    font-weight: 600;
}

.perfil-acciones {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.accion-btn {
    padding: 9px 15px;
    background: linear-gradient(90deg, var(--btn-a), var(--btn-b));
    border: none;
    border-radius: 6px;
    color: #fff;
    font-family: 'Inter', sans-serif;
    font-size: 12.5px;
    font-weight: 600;
    cursor: pointer;
}

.accion-btn.accion-suave {
    background: transparent;
    border: 1px solid var(--panel-border);
    color: var(--txt-progress);
}

.accion-btn.accion-suave:hover {
    border-color: var(--panel-hover);
    color: var(--d-text);
}


/* --------- Ajustes --------- */

.ajustes {
    display: grid;
    gap: 8px;
}

.ajuste {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 16px;
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    box-shadow: var(--panel-shadow);
}

.ajuste-txt h3 {
    margin: 0 0 3px;
    font-size: 14.5px;
    font-weight: 600;
}

.ajuste-txt p {
    margin: 0;
    max-width: 58ch;
    color: var(--txt-topic);
    font-size: 12.5px;
    line-height: 1.5;
}

.ajuste-btn {
    flex-shrink: 0;
    min-width: 108px;
    padding: 8px 12px;
    background: var(--sim-btn-bg);
    border: 1px solid var(--sim-btn-border);
    border-radius: 6px;
    color: var(--sim-btn-text);
    font-family: 'Inter', sans-serif;
    font-size: 12.5px;
    font-weight: 600;
    cursor: pointer;
}

.ajuste-btn:hover {
    border-color: var(--panel-hover);
}

.ajuste-riesgo .ajuste-btn {
    background: transparent;
    border-color: var(--star-border);
    color: var(--star-color);
}

.volver-btn:focus-visible,
.opcion:focus-visible,
.reto-op:focus-visible,
.accion-btn:focus-visible,
.ajuste-btn:focus-visible,
.more-button:focus-visible,
.sim-button:focus-visible,
.hero-button:focus-visible {
    outline: 2px solid var(--panel-hover);
    outline-offset: 2px;
}


/* --------- Pantallas pequeñas --------- */

@media (max-width:800px) {

    .tema-fila,
    .sim-ficha {
        grid-template-columns: minmax(0, 1fr);
    }

    .tema-dibujo {
        min-height: 74px;
    }

    .sim-ficha .sim-image {
        min-height: 74px;
    }

    .puntos-cabecera {
        grid-template-columns: minmax(0, 1fr);
    }

    .lectura-titulo,
    .lectura-resumen,
    .lectura-bloque,
    .lectura-sub,
    .formulas,
    .preguntas,
    .pie-nota,
    .pie-final {
        margin-left: 14px;
        margin-right: 14px;
    }

    .ajuste {
        flex-direction: column;
        align-items: flex-start;
    }

    .perfil-tarjeta {
        flex-direction: column;
        text-align: center;
    }

    .perfil-chips {
        justify-content: center;
    }

}

/* =========================================================
   TEMAS: ILUSTRACIONES Y LABORATORIO
   ========================================================= */

/* --------- Resumen de arriba --------- */

.temas-resumen {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 8px;
    margin-bottom: 12px;
}

.mini-dato {
    padding: 10px 13px;
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    box-shadow: var(--panel-shadow);
}

.mini-dato strong {
    display: block;
    font-size: 18px;
    font-weight: 600;
}

.mini-dato span {
    color: var(--txt-progress);
    font-size: 11px;
    letter-spacing: .04em;
    text-transform: uppercase;
}

/* --------- Ilustración del tema --------- */

.tema-dibujo,
.lectura-portada {
    display: block;
}

.ilu {
    position: absolute;
    inset: 6px;
    width: 100%;
    height: 100%;
}

.ilu .i-piso {
    stroke: var(--panel-border);
    stroke-width: 2;
}

.ilu .i-cuerpo {
    fill: var(--panel-a);
    stroke: var(--chevron);
    stroke-width: 2;
    stroke-linejoin: round;
}

.ilu .i-flecha {
    stroke: var(--star-color);
    stroke-width: 2.4;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.ilu .i-arco {
    stroke: var(--txt-progress);
    stroke-width: 1.4;
    fill: none;
    stroke-dasharray: 4 5;
    opacity: .6;
}

.ilu .i-bola {
    fill: var(--accent-text);
}

.ilu .i-onda {
    stroke: var(--accent-text);
    stroke-width: 2.2;
    fill: none;
    stroke-linecap: round;
}

.ilu .i-onda.i-tenue {
    stroke: var(--chevron);
    stroke-width: 1.4;
    opacity: .5;
}

.ilu .i-estela {
    stroke: var(--txt-progress);
    stroke-width: 1.6;
    stroke-linecap: round;
    opacity: .45;
}

.ilu .i-cota {
    stroke: var(--txt-progress);
    stroke-width: 1.2;
}

.ilu .i-txt {
    fill: var(--txt-progress);
    font-family: 'Inter', sans-serif;
    font-size: 15.5px;
    font-style: italic;
}

.ilu .i-haz {
    stroke: var(--d-text);
    stroke-width: 2.4;
    stroke-linecap: round;
    opacity: .85;
}

.ilu .i-prisma {
    fill: var(--rank-cur-bg);
    stroke: var(--accent-text);
    stroke-width: 1.6;
    stroke-linejoin: round;
}

.ilu .i-arcoiris line {
    stroke-width: 2.2;
    stroke-linecap: round;
}

.ilu .i-arcoiris .a1 {
    stroke: #ef4444;
}

.ilu .i-arcoiris .a2 {
    stroke: #f59e0b;
}

.ilu .i-arcoiris .a3 {
    stroke: #eab308;
}

.ilu .i-arcoiris .a4 {
    stroke: #22c55e;
}

.ilu .i-arcoiris .a5 {
    stroke: #3b82f6;
}

.ilu .i-arcoiris .a6 {
    stroke: #a855f7;
}

.ilu .i-cable {
    fill: none;
    stroke: var(--chevron);
    stroke-width: 2.2;
}

.ilu .i-foco {
    fill: var(--star-color);
    fill-opacity: .85;
    stroke: var(--star-border);
    stroke-width: 1.6;
}

.ilu .i-foco-luz {
    fill: var(--star-color);
    opacity: .16;
}

.ilu .i-filamento {
    stroke: var(--star-border);
    stroke-width: 1.4;
    fill: none;
}

.ilu .i-carga {
    fill: var(--accent-text);
}

/* Movimiento de las ilustraciones */

.ilu .i-lanza {
    animation: iluLanza 4s ease-in-out infinite;
}

@keyframes iluLanza {
    0% {
        transform: translate(0, 0);
        opacity: 0;
    }

    12% {
        opacity: 1;
    }

    50% {
        transform: translate(108px, -48px);
    }

    88% {
        transform: translate(216px, 0);
        opacity: 1;
    }

    100% {
        transform: translate(216px, 0);
        opacity: 0;
    }
}

.ilu .i-caja {
    animation: iluEmpuje 3s ease-in-out infinite;
}

@keyframes iluEmpuje {

    0%,
    100% {
        transform: translateX(-8px);
    }

    50% {
        transform: translateX(10px);
    }
}

.ilu .i-estela.e1 {
    animation: iluFade 1.8s ease-in-out infinite;
}

.ilu .i-estela.e2 {
    animation: iluFade 1.8s ease-in-out .2s infinite;
}

.ilu .i-estela.e3 {
    animation: iluFade 1.8s ease-in-out .4s infinite;
}

@keyframes iluFade {

    0%,
    100% {
        opacity: .12;
    }

    50% {
        opacity: .65;
    }
}

.ilu .i-desliza {
    animation: iluDesliza 2.6s linear infinite;
}

@keyframes iluDesliza {
    from {
        transform: translateX(0);
    }

    to {
        transform: translateX(80px);
    }
}

.ilu .i-arcoiris {
    animation: iluBrilla 3.4s ease-in-out infinite;
}

@keyframes iluBrilla {

    0%,
    100% {
        opacity: .6;
    }

    50% {
        opacity: 1;
    }
}

.ilu .i-foco-luz {
    animation: iluLatido 2.6s ease-in-out infinite;
}

@keyframes iluLatido {

    0%,
    100% {
        opacity: .10;
    }

    50% {
        opacity: .30;
    }
}

.ilu .i-carga {
    animation: iluCorre 3s linear infinite;
}

.ilu .i-carga.c2 {
    animation-delay: 1s;
}

.ilu .i-carga.c3 {
    animation-delay: 2s;
}

@keyframes iluCorre {
    0% {
        transform: translateX(0);
        opacity: 0;
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 1;
    }

    100% {
        transform: translateX(208px);
        opacity: 0;
    }
}

/* --------- Tarjeta del tema --------- */

.tema-fila.tema-sugerido {
    border-color: var(--panel-hover);
}

.tema-pie {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}

.tema-anillo {
    position: relative;
    width: 34px;
    height: 34px;
    flex-shrink: 0;
    border-radius: 50%;
    background: conic-gradient(var(--ring-fill) 0deg var(--pct), var(--ring-track) var(--pct) 360deg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tema-anillo:after {
    content: "";
    position: absolute;
    inset: 4px;
    border-radius: 50%;
    background: var(--panel-a);
}

.tema-anillo span {
    position: relative;
    z-index: 2;
    font-size: 11px;
    font-weight: 600;
}

.tema-abrir {
    color: var(--accent-text);
    font-size: 12.5px;
    font-weight: 600;
}

.tema-fila:hover .tema-abrir {
    text-decoration: underline;
}

.tema-marca {
    margin-left: auto;
    padding: 2px 8px;
    border: 1px solid var(--panel-hover);
    border-radius: 20px;
    color: var(--accent-text);
    font-size: 11px;
    letter-spacing: .04em;
    text-transform: uppercase;
}

/* --------- Laboratorio rápido --------- */

.lab {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 12px;
    margin: 0 26px;
    padding: 14px;
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    background: var(--card-a);
}

.lab-escena {
    border: 1px solid var(--panel-border);
    border-radius: 7px;
    background:
        radial-gradient(circle at 50% 120%, var(--d-halo-1), transparent 62%),
        var(--panel-b);
    padding: 6px;
    display: flex;
    align-items: center;
}

.lab-svg {
    display: block;
    width: 100%;
    height: auto;
}

.lab-svg .l-piso,
.lab-svg .l-cota {
    stroke: var(--panel-border);
    stroke-width: 1.8;
}

.lab-svg .l-normal {
    stroke: var(--txt-progress);
    stroke-width: 1.2;
    stroke-dasharray: 3 4;
    opacity: .7;
}

.lab-svg .l-cuerpo {
    fill: var(--panel-a);
    stroke: var(--chevron);
    stroke-width: 2;
}

.lab-svg .l-flecha {
    stroke: var(--star-color);
    stroke-width: 2.6;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.lab-svg .l-onda {
    stroke: var(--accent-text);
    stroke-width: 2.2;
    fill: none;
    stroke-linecap: round;
}

.lab-svg .l-agua {
    fill: var(--rank-cur-bg);
}

.lab-svg .l-rayo {
    stroke: var(--star-color);
    stroke-width: 2.6;
    stroke-linecap: round;
}

.lab-svg .l-rayo-2 {
    stroke: var(--accent-text);
}

.lab-svg .l-cable {
    fill: none;
    stroke: var(--chevron);
    stroke-width: 2.2;
}

.lab-svg .l-resistencia {
    fill: var(--panel-a);
    stroke: var(--chevron);
    stroke-width: 1.8;
}

.lab-svg .l-foco {
    fill: var(--star-color);
    stroke: var(--star-border);
    stroke-width: 1.6;
}

.lab-svg .l-halo {
    fill: var(--star-color);
}

.lab-svg .l-filamento {
    stroke: var(--star-border);
    stroke-width: 1.4;
    fill: none;
}

.lab-svg .l-carga {
    fill: var(--accent-text);
    animation: labCorre 2s linear infinite;
}

@keyframes labCorre {
    0% {
        transform: translateX(0);
        opacity: 0;
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 1;
    }

    100% {
        transform: translateX(208px);
        opacity: 0;
    }
}

.lab-svg .l-desliza {
    animation: labDesliza 2s linear infinite;
}

@keyframes labDesliza {
    from {
        transform: translateX(0);
    }

    to {
        transform: translateX(var(--paso, 60px));
    }
}

.lab-svg .l-txt {
    fill: var(--txt-progress);
    font-family: 'Inter', sans-serif;
    font-size: 13.5px;
}

.lab-svg .l-dato {
    fill: var(--accent-text);
    font-weight: 600;
}

.lab-panel {
    display: flex;
    flex-direction: column;
    gap: 9px;
    min-width: 0;
}

.lab-nota {
    margin: 0;
    color: var(--txt-topic);
    font-size: 12px;
    line-height: 1.55;
}

.lab-control {
    display: block;
}

.lab-et {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 4px;
    color: var(--txt-progress);
    font-size: 12px;
}

.lab-et b {
    color: var(--d-text);
    font-size: 13.5px;
    font-variant-numeric: tabular-nums;
}

.lab-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 10px;
    background: var(--track);
    outline: none;
    cursor: pointer;
}

.lab-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: linear-gradient(180deg, var(--fill-a), var(--fill-b));
    border: 2px solid var(--panel-a);
    cursor: pointer;
    box-shadow: 0 0 0 1px var(--panel-hover);
}

.lab-slider::-moz-range-thumb {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--fill-b);
    border: 2px solid var(--panel-a);
    cursor: pointer;
}

.lab-slider:focus-visible {
    outline: 2px solid var(--panel-hover);
    outline-offset: 3px;
}

.lab-resultado {
    margin-top: auto;
    padding: 10px 12px;
    border: 1px solid var(--panel-border);
    border-radius: 7px;
    background: var(--panel-b);
}

.lab-formula {
    display: block;
    color: var(--accent-text);
    font-size: 13.5px;
    font-style: italic;
    margin-bottom: 2px;
}

.lab-resultado strong {
    display: block;
    font-size: 22px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.lab-pie {
    display: block;
    margin-top: 3px;
    color: var(--txt-progress);
    font-size: 11.5px;
}

@media (max-width:800px) {

    .lab {
        grid-template-columns: minmax(0, 1fr);
        margin: 0 14px;
    }

}

@media (prefers-reduced-motion: reduce) {

    .ilu *,
    .lab-svg *,
    .sound-sim:after {
        animation: none !important;
    }

}


/* =========================================================
   SIMULADOR EMBEBIDO
   La simulación vive dentro de la app: el marco, la cabecera
   y la guía usan los mismos colores de la plataforma.
   ========================================================= */

.sim-abrir,
.sim-button-listo {
    margin-top: 10px;
    padding: 8px 14px;
    background: linear-gradient(180deg, var(--btn-a), var(--btn-b));
    border: 1px solid var(--active-border);
    border-radius: 6px;
    color: #fff;
    font-family: 'Inter', sans-serif;
    font-size: 12.5px;
    font-weight: 600;
    cursor: pointer;
    transition: .2s;
}

.sim-abrir:hover,
.sim-button-listo:hover {
    filter: brightness(1.12);
}

.sim-vista {
    border: 1px solid var(--panel-border);
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    border-radius: 8px;
    padding: 16px 18px 18px;
    box-shadow: var(--panel-shadow);
}

.sim-vista-cab {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--panel-border);
}

.sim-vista-eti {
    display: block;
    color: var(--accent-text);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.sim-vista-titulo {
    margin: 2px 0 3px;
    font-size: 21px;
    font-weight: 600;
    color: var(--d-text);
}

.sim-vista-resumen {
    margin: 0;
    color: var(--txt-hero);
    font-size: 13px;
}

.sim-vista-acciones {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.sim-vista-formula {
    padding: 5px 11px;
    border: 1px solid var(--chip-border);
    border-radius: 20px;
    background: var(--chip-bg);
    color: var(--accent-text);
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-size: 12px;
}

.sim-accion {
    padding: 7px 13px;
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    background: transparent;
    color: var(--txt-progress);
    font-family: 'Inter', sans-serif;
    font-size: 12.5px;
    cursor: pointer;
    transition: .2s;
}

.sim-accion:hover {
    border-color: var(--panel-hover);
    color: var(--d-text);
}

.sim-accion-p {
    background: linear-gradient(180deg, var(--btn-a), var(--btn-b));
    border-color: var(--active-border);
    color: #fff;
}

/* Marco de la simulación: mantiene la proporción y el borde de la app */
.sim-marco {
    position: relative;
    margin: 14px 0 4px;
    border: 1px solid var(--sim-img-border);
    border-radius: 8px;
    overflow: hidden;
    background: #f7f9fc;
    aspect-ratio: 16 / 10;
    max-height: 74vh;
}

.sim-marco:fullscreen {
    aspect-ratio: auto;
    max-height: none;
    height: 100%;
    border: 0;
    border-radius: 0;
}

.sim-frame {
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
}

.sim-cargando {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background: linear-gradient(180deg, var(--panel-a), var(--panel-b));
    color: var(--txt-progress);
    font-size: 13px;
}

/* Guía de uso al lado del simulador */
.sim-guias {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 14px;
}

.sim-guia {
    border: 1px solid var(--panel-border-2);
    background: linear-gradient(180deg, var(--card-a), var(--card-b));
    border-radius: 7px;
    padding: 13px 15px;
}

.sim-guia-t {
    margin: 0 0 8px;
    color: var(--accent-text);
    font-size: 13px;
    font-weight: 600;
}

.sim-pasos {
    margin: 0;
    padding-left: 20px;
    color: var(--txt-topic);
    font-size: 12.5px;
    line-height: 1.6;
}

.sim-pasos li {
    margin-bottom: 7px;
}

.sim-pasos li::marker {
    color: var(--accent-text);
    font-weight: 600;
}

.sim-observa {
    margin: 0;
    padding-left: 18px;
    color: var(--txt-topic);
    font-size: 12.5px;
    line-height: 1.6;
    list-style: none;
}

.sim-observa li {
    position: relative;
    margin-bottom: 7px;
}

.sim-observa li::before {
    content: "›";
    position: absolute;
    left: -13px;
    color: var(--accent-text);
    font-weight: 700;
}

.sim-aprendes {
    margin: 10px 0 0;
    padding-top: 10px;
    border-top: 1px solid var(--panel-border);
    color: var(--txt-hero);
    font-size: 12.5px;
    line-height: 1.55;
}

.sim-credito {
    margin: 12px 0 0;
    color: var(--txt-progress);
    font-size: 11.5px;
    line-height: 1.5;
}

@media (max-width:800px) {

    .sim-guias {
        grid-template-columns: minmax(0, 1fr);
    }

    .sim-marco {
        aspect-ratio: 4 / 3;
        max-height: 68vh;
    }

    .sim-vista-cab {
        align-items: flex-start;
    }

}