/* ==========================================================================
   LENGUAJE MUSICAL · JUANJO LLOPICO
   Sistema de diseño v3 — "Papel de partitura"
   Editorial, cálido y accesible. Claro / oscuro / alto contraste.
   ========================================================================== */

/* --- 1. TOKENS ------------------------------------------------------------ */
:root {
  color-scheme: light;

  --bg: #FAF7F1;
  --surface: #FFFFFF;
  --surface-2: #F3EEE4;
  --ink: #15171C;
  --ink-2: #464A55;
  --ink-3: #6A6E7A;
  --line: #E4DED2;
  --line-strong: #CBC3B3;
  --inverse: #FAF7F1;

  --teoria: #3A3FA6;       --teoria-soft: #ECECFA;
  --dictados: #C23A1C;     --dictados-soft: #FBEAE4;
  --lenguaje: #0E6B55;     --lenguaje-soft: #E2F1EC;
  --solucion: #8C5A00;     --solucion-soft: #F8EDD3;

  --accent: var(--dictados);
  --focus: #1F4FD8;

  --dark-block: #15171C;
  --dark-block-2: #1E222B;
  --on-dark: #F2EEE4;
  --on-dark-2: #B9B6AD;

  --staff-line: rgba(21, 23, 28, .075);
  --shadow-sm: 0 1px 2px rgba(21, 23, 28, .05), 0 2px 8px rgba(21, 23, 28, .04);
  --shadow-md: 0 4px 12px rgba(21, 23, 28, .06), 0 16px 40px -12px rgba(21, 23, 28, .14);
  --shadow-lg: 0 30px 70px -24px rgba(21, 23, 28, .45);

  --font-heading: 'Fraunces', 'Iowan Old Style', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --container: 1180px;
  --header-h: 4.25rem;
  --font-scale: 1;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0E1014;
  --surface: #161921;
  --surface-2: #1B1F28;
  --ink: #F2EEE4;
  --ink-2: #C4C1B8;
  --ink-3: #98958E;
  --line: #2A2E38;
  --line-strong: #3C4150;
  --inverse: #0E1014;

  --teoria: #A3A8FF;       --teoria-soft: rgba(163, 168, 255, .13);
  --dictados: #FF8D6E;     --dictados-soft: rgba(255, 141, 110, .13);
  --lenguaje: #5ED1AE;     --lenguaje-soft: rgba(94, 209, 174, .13);
  --solucion: #F2BA60;     --solucion-soft: rgba(242, 186, 96, .13);
  --focus: #8FB0FF;

  --dark-block: #1B1F28;
  --dark-block-2: #232834;
  --staff-line: rgba(255, 255, 255, .06);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
  --shadow-md: 0 8px 28px -8px rgba(0, 0, 0, .55);
  --shadow-lg: 0 30px 70px -24px rgba(0, 0, 0, .8);
}

/* Alto contraste: bordes marcados, texto máximo contraste */
:root[data-contrast="high"] {
  --bg: #FFFFFF;
  --surface: #FFFFFF;
  --surface-2: #F2F2F2;
  --ink: #000000;
  --ink-2: #000000;
  --ink-3: #1A1A1A;
  --line: #000000;
  --line-strong: #000000;
  --teoria: #1B1F8A;  --dictados: #A12600;  --lenguaje: #045241;  --solucion: #6B4300;
  --teoria-soft: #FFFFFF;  --dictados-soft: #FFFFFF;  --lenguaje-soft: #FFFFFF;  --solucion-soft: #FFFFFF;
  --staff-line: transparent;
  --dark-block: #000000;
  --dark-block-2: #000000;
  --on-dark: #FFFFFF;
  --on-dark-2: #FFFFFF;
}
:root[data-theme="dark"][data-contrast="high"] {
  --bg: #000000;
  --surface: #000000;
  --surface-2: #0A0A0A;
  --ink: #FFFFFF;
  --ink-2: #FFFFFF;
  --ink-3: #E6E6E6;
  --line: #FFFFFF;
  --line-strong: #FFFFFF;
  --inverse: #000000;
  --teoria: #C4C7FF;  --dictados: #FFB09A;  --lenguaje: #86F0CF;  --solucion: #FFD488;
  --teoria-soft: #000000;  --dictados-soft: #000000;  --lenguaje-soft: #000000;  --solucion-soft: #000000;
  --dark-block: #000000;
}
:root[data-contrast="high"] .card,
:root[data-contrast="high"] .area-card,
:root[data-contrast="high"] .dictation-player-card,
:root[data-contrast="high"] .btn,
:root[data-contrast="high"] .search-card,
:root[data-contrast="high"] .chip-btn { border-width: 2px; border-color: var(--ink); }
:root[data-contrast="high"] .btn-primary { background: var(--ink); color: var(--inverse); }

/* --- 2. BASE -------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { font-size: calc(100% * var(--font-scale)); scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 1rem); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4 { margin: 0; font-family: var(--font-heading); font-weight: 600; line-height: 1.12; letter-spacing: -0.015em; font-optical-sizing: auto; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
img, svg { display: block; max-width: 100%; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
strong { font-weight: 600; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 6px; }
::selection { background: var(--ink); color: var(--inverse); }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: -4rem; left: 1rem; z-index: 200; padding: .7rem 1.1rem; background: var(--ink); color: var(--inverse); border-radius: 999px; font-weight: 600; text-decoration: none; transition: top .2s; }
.skip-link:focus { top: 1rem; }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: clamp(1.25rem, 4vw, 2rem); }
.icon { width: 1.15em; height: 1.15em; flex: none; }

/* --- 3. CABECERA ---------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 1.25rem; min-height: var(--header-h); }

.logo-brand { display: inline-flex; align-items: center; gap: .75rem; text-decoration: none; color: var(--ink); }
.logo-mark { width: 2.75rem; height: 2.75rem; flex: none; border-radius: 12px; }
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-title { font-family: var(--font-heading); font-weight: 600; font-size: 1.2rem; letter-spacing: -0.01em; }
.logo-subtitle { font-size: .75rem; color: var(--ink-3); margin-top: .2rem; letter-spacing: .02em; }
.logo-on-dark { color: var(--on-dark); }
.logo-on-dark .logo-subtitle { color: var(--on-dark-2); }

.main-nav { margin-left: auto; }
.nav-links { display: flex; align-items: center; gap: .25rem; }
.nav-link {
  position: relative; display: block; padding: .55rem .9rem; border-radius: 999px;
  font-size: .92rem; font-weight: 500; color: var(--ink-2); text-decoration: none;
  transition: color .15s, background-color .15s;
}
.nav-link:hover { color: var(--ink); background: var(--surface-2); }
.nav-link.active { color: var(--ink); font-weight: 600; }
.nav-link.active::after { content: ""; position: absolute; left: .9rem; right: .9rem; bottom: .2rem; height: 2px; border-radius: 2px; background: var(--accent); }

.header-tools { display: flex; align-items: center; gap: .4rem; }
.icon-btn {
  display: inline-grid; place-items: center; width: 2.6rem; height: 2.6rem; border-radius: 50%;
  border: 1px solid transparent; background: transparent; color: var(--ink);
  transition: background-color .15s, border-color .15s;
}
.icon-btn:hover { background: var(--surface-2); border-color: var(--line); }
.icon-btn .icon { width: 1.35rem; height: 1.35rem; }
.menu-toggle { display: none; }
.menu-toggle .icon-close { display: none; }
.menu-toggle[aria-expanded="true"] .icon-open { display: none; }
.menu-toggle[aria-expanded="true"] .icon-close { display: block; }

.a11y-menu { position: relative; }
.a11y-panel {
  position: absolute; right: 0; top: calc(100% + .6rem); width: 19.5rem; padding: .6rem;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-md); box-shadow: var(--shadow-md);
}
.a11y-panel[hidden] { display: none; }
.a11y-panel-title { padding: .4rem .7rem .5rem; font-size: .72rem; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.a11y-row { display: flex; align-items: center; gap: .75rem; width: 100%; padding: .65rem .7rem; border: 0; border-radius: var(--radius-sm); background: transparent; text-align: left; font-size: .92rem; font-weight: 500; }
button.a11y-row:hover { background: var(--surface-2); }
.a11y-row-static { justify-content: space-between; cursor: default; white-space: nowrap; }
.a11y-row-icon { display: grid; place-items: center; width: 1.9rem; height: 1.9rem; border-radius: 8px; background: var(--surface-2); }
.a11y-row-icon .icon-sun { display: none; }
:root[data-theme="dark"] .a11y-row-icon .icon-moon { display: none; }
:root[data-theme="dark"] .a11y-row-icon .icon-sun { display: block; }
.font-scale-group { display: inline-flex; gap: .25rem; }
.a11y-btn { min-width: 2.2rem; height: 2.2rem; padding: 0 .5rem; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--surface); font-size: .85rem; font-weight: 600; }
.a11y-btn:hover { border-color: var(--ink); }

/* --- 4. BOTONES ----------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .55rem;
  padding: .8rem 1.4rem; border-radius: 999px; border: 1.5px solid transparent;
  font-size: .95rem; font-weight: 600; line-height: 1.2; text-decoration: none; white-space: nowrap;
  transition: background-color .18s, color .18s, border-color .18s, transform .18s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--ink); color: var(--inverse); }
.btn-primary:hover { background: var(--ink-2); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { filter: brightness(.92); }
:root[data-theme="dark"] .btn-accent { color: #15171C; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--ink); background: var(--surface); }
.btn-secondary { background: var(--surface); color: var(--ink); border-color: var(--line-strong); }
.btn-secondary:hover { border-color: var(--ink); }
.btn-sm { padding: .5rem .95rem; font-size: .85rem; gap: .45rem; }
.btn-lg { padding: .95rem 1.5rem; font-size: 1rem; }
.btn-block { width: 100%; }
.btn-sol { background: var(--solucion-soft); color: var(--solucion); border-color: transparent; }
.btn-sol:hover { border-color: var(--solucion); }
.btn-audio { background: var(--dictados-soft); color: var(--dictados); border-color: transparent; }
.btn-audio:hover { border-color: var(--dictados); }
.btn .icon { width: 1.1em; height: 1.1em; }

/* --- 5. ELEMENTOS DE SECCIÓN --------------------------------------------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: .7rem;
  font-size: .76rem; font-weight: 600; letter-spacing: .15em; text-transform: uppercase; color: var(--accent);
}
.eyebrow::before { content: ""; width: 1.6rem; height: 2px; background: currentColor; border-radius: 2px; }

.section-block { padding-block: clamp(3.5rem, 8vw, 6rem); }
.section-alt { background: var(--surface-2); border-block: 1px solid var(--line); }
.section-header { max-width: 46rem; margin-bottom: clamp(2rem, 4vw, 3rem); display: grid; gap: .9rem; }
.section-title { font-size: clamp(1.85rem, 3.6vw, 2.75rem); }
.section-desc { font-size: 1.05rem; color: var(--ink-2); max-width: 40rem; }
.section-header-split { max-width: none; display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.section-header-split > div { display: grid; gap: .9rem; max-width: 46rem; }

.grid-2, .grid-3 { display: grid; gap: 1.25rem; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 700px) { .grid-2, .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1020px) { .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

/* --- 6. HOME · HERO ------------------------------------------------------- */
:root {
  --staff-bg: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='130'%3E%3Cg stroke='%2315171C' stroke-opacity='.085' stroke-width='1'%3E%3Cpath d='M0 30.5h120M0 41.5h120M0 52.5h120M0 63.5h120M0 74.5h120'/%3E%3C/g%3E%3C/svg%3E");
}
:root[data-theme="dark"] {
  --staff-bg: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='130'%3E%3Cg stroke='%23ffffff' stroke-opacity='.07' stroke-width='1'%3E%3Cpath d='M0 30.5h120M0 41.5h120M0 52.5h120M0 63.5h120M0 74.5h120'/%3E%3C/g%3E%3C/svg%3E");
}
:root[data-contrast="high"] { --staff-bg: none; }

.hero-home { position: relative; overflow: hidden; padding-block: clamp(2.75rem, 6vw, 5.5rem) clamp(2.5rem, 5vw, 4rem); isolation: isolate; }
.hero-home::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background-image: var(--staff-bg); background-repeat: repeat;
  -webkit-mask-image: radial-gradient(120% 90% at 85% 15%, #000 0%, transparent 70%);
  mask-image: radial-gradient(120% 90% at 85% 15%, #000 0%, transparent 70%);
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(2.5rem, 5vw, 4rem); align-items: center; }
@media (min-width: 960px) { .hero-grid { grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); } }

.hero-title { font-size: clamp(2.7rem, 6.4vw, 5rem); line-height: 1.02; letter-spacing: -0.03em; margin-block: 1.4rem 1.5rem; font-weight: 600; }
.hero-title em { font-style: italic; font-weight: 500; color: var(--accent); }
.hero-subtitle { font-size: clamp(1.05rem, 1.5vw, 1.2rem); color: var(--ink-2); max-width: 36rem; }
.hero-cta-group { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }

.player-preview {
  position: relative; padding: 1.5rem; border-radius: var(--radius-lg);
  background: var(--dark-block); color: var(--on-dark); box-shadow: var(--shadow-lg);
  border: 1px solid transparent;
}
:root[data-theme="dark"] .player-preview { border-color: var(--line); }
.player-preview-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1.25rem; font-size: .8rem; color: var(--on-dark-2); }
.player-preview-head strong { color: var(--on-dark); font-weight: 600; font-size: .9rem; }
.pill { display: inline-flex; align-items: center; gap: .4rem; padding: .25rem .65rem; border-radius: 999px; font-size: .72rem; font-weight: 600; letter-spacing: .04em; background: rgba(255,255,255,.1); color: var(--on-dark); }
.pill::before { content: ""; width: .45rem; height: .45rem; border-radius: 50%; background: #FF8D6E; }
.player-preview .stave { width: 100%; height: auto; color: var(--on-dark); margin-bottom: 1.25rem; }
.wave { display: flex; align-items: center; gap: 3px; height: 3.6rem; margin-bottom: 1.25rem; }
.wave span { flex: 1; height: var(--h); min-width: 2px; border-radius: 3px; background: rgba(255,255,255,.22); }
.wave span:nth-child(-n+24) { background: #FF8D6E; }
.player-preview-ctrl { display: flex; align-items: center; gap: .75rem; }
.pp-btn { display: grid; place-items: center; width: 2.6rem; height: 2.6rem; border-radius: 50%; background: rgba(255,255,255,.1); color: var(--on-dark); }
.pp-btn .icon { width: 1.15rem; height: 1.15rem; }
.pp-btn.pp-play { width: 3.4rem; height: 3.4rem; background: #FF8D6E; color: #15171C; }
.pp-btn.pp-play .icon { width: 1.4rem; height: 1.4rem; margin-left: 2px; }
.pp-speed { margin-left: auto; display: inline-flex; padding: .2rem; border-radius: 999px; background: rgba(255,255,255,.08); }
.pp-speed span { padding: .3rem .65rem; border-radius: 999px; font-size: .76rem; font-weight: 600; color: var(--on-dark-2); }
.pp-speed span.on { background: var(--on-dark); color: #15171C; }

.stats-strip { margin-top: clamp(2.5rem, 5vw, 4rem); display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line-strong); }
@media (min-width: 760px) { .stats-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.stat-item { display: flex; flex-direction: column; gap: .35rem; padding: 1.5rem 1.25rem 0 0; text-decoration: none; color: inherit; }
.stat-num { font-family: var(--font-heading); font-size: clamp(2.4rem, 4.4vw, 3.4rem); font-weight: 600; line-height: 1; letter-spacing: -0.03em; transition: color .2s; }
.stat-label { font-size: .88rem; color: var(--ink-3); }
.stat-item:hover .stat-num { color: var(--accent); }

/* --- 7. BUSCADOR ---------------------------------------------------------- */
.search-section { padding-block: 0 clamp(1rem, 3vw, 2rem); }
.search-card { padding: clamp(1.1rem, 2.4vw, 1.75rem); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.search-card-title { font-family: var(--font-heading); font-size: 1.35rem; font-weight: 600; margin-bottom: 1rem; }
.search-box-wrapper { display: flex; align-items: center; gap: .85rem; padding: .35rem 1.1rem; background: var(--bg); border: 1.5px solid var(--line-strong); border-radius: 999px; transition: border-color .15s, box-shadow .15s; }
.search-box-wrapper:focus-within { border-color: var(--ink); box-shadow: 0 0 0 4px color-mix(in srgb, var(--focus) 22%, transparent); }
.search-icon { color: var(--ink-3); }
.search-icon .icon { width: 1.3rem; height: 1.3rem; }
.global-search-input { flex: 1; min-width: 0; padding: .8rem 0; border: 0; background: transparent; font-size: 1.05rem; outline: none; }
.global-search-input::placeholder { color: var(--ink-3); }
.global-search-input:focus-visible { outline: none; }
.filter-chips { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.chip-btn { padding: .5rem 1rem; border: 1px solid var(--line-strong); border-radius: 999px; background: transparent; font-size: .86rem; font-weight: 500; color: var(--ink-2); transition: all .15s; }
.chip-btn:hover { border-color: var(--ink); color: var(--ink); }
.chip-btn.active { background: var(--ink); border-color: var(--ink); color: var(--inverse); }

.search-results-pane { display: none; margin-top: 1.1rem; max-height: 26rem; overflow-y: auto; overscroll-behavior: contain; border-top: 1px solid var(--line); padding-top: .9rem; }
.search-results-pane.visible { display: block; }
.result-count { font-size: .85rem; font-weight: 600; color: var(--ink-3); margin-bottom: .5rem; }
.result-empty { padding: 1.5rem 1rem; text-align: center; color: var(--ink-3); }
.result-item { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .8rem .25rem; border-bottom: 1px solid var(--line); }
.result-item:last-child { border-bottom: 0; }
.result-title { font-weight: 600; font-size: .95rem; }
.result-meta { font-size: .8rem; color: var(--ink-3); margin-top: .1rem; }
.result-meta code { font-family: var(--font-mono); font-size: .74rem; }
.result-actions { display: flex; gap: .4rem; flex: none; }
@media (max-width: 640px) { .result-item { flex-direction: column; align-items: flex-start; } }

/* --- 8. HOME · ÁREAS Y UNIDADES ------------------------------------------ */
.areas-grid { display: grid; gap: 1.25rem; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) { .areas-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.area-card {
  --c: var(--teoria); --c-soft: var(--teoria-soft);
  position: relative; display: flex; flex-direction: column; gap: 1.1rem; padding: 1.75rem;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg);
  transition: transform .25s cubic-bezier(.2,.7,.2,1), border-color .2s, box-shadow .25s;
}
.area-card::before { content: ""; position: absolute; left: 1.75rem; right: 1.75rem; top: -1px; height: 3px; border-radius: 0 0 3px 3px; background: var(--c); }
.area-card:hover { transform: translateY(-4px); border-color: var(--c); box-shadow: var(--shadow-md); }
.area-teoria { --c: var(--teoria); --c-soft: var(--teoria-soft); }
.area-dictados { --c: var(--dictados); --c-soft: var(--dictados-soft); }
.area-lenguaje { --c: var(--lenguaje); --c-soft: var(--lenguaje-soft); }
.area-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.area-icon { display: grid; place-items: center; width: 3.2rem; height: 3.2rem; border-radius: 14px; background: var(--c-soft); color: var(--c); }
.area-icon .icon { width: 1.6rem; height: 1.6rem; }
.area-meta { font-size: .78rem; font-weight: 600; color: var(--c); letter-spacing: .02em; }
.area-title { font-size: 1.65rem; }
.area-desc { color: var(--ink-2); font-size: .98rem; }
.area-list { display: grid; gap: .55rem; font-size: .92rem; color: var(--ink-2); flex: 1; }
.area-list li { display: grid; grid-template-columns: auto 1fr; gap: .65rem; align-items: baseline; }
.area-list b { font-size: .7rem; font-weight: 700; letter-spacing: .04em; color: var(--c); min-width: 2.6rem; }
.area-link { display: inline-flex; align-items: center; gap: .5rem; margin-top: .4rem; font-weight: 600; color: var(--c); text-decoration: none; }
.area-link::after { content: ""; position: absolute; inset: 0; }
.area-link .icon { transition: transform .2s; }
.area-card:hover .area-link .icon { transform: translateX(4px); }

.unit-list { display: grid; grid-template-columns: minmax(0, 1fr); border-top: 1px solid var(--line-strong); }
@media (min-width: 760px) { .unit-list { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 3rem; } }
@media (min-width: 1060px) { .unit-list { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.unit-row { display: grid; grid-template-columns: auto 1fr auto; gap: 1.1rem; align-items: center; padding: 1.5rem .25rem; border-bottom: 1px solid var(--line-strong); text-decoration: none; transition: background-color .2s, padding .2s; }
.unit-row:hover { background: var(--surface); padding-inline: 1rem; }
.unit-num { font-family: var(--font-heading); font-size: 2.6rem; font-weight: 500; line-height: 1; color: var(--ink-3); font-variant-numeric: lining-nums; transition: color .2s; min-width: 3.4rem; }
.unit-row:hover .unit-num { color: var(--teoria); }
.unit-info h3 { font-size: 1.12rem; margin-bottom: .2rem; }
.unit-info p { font-size: .86rem; color: var(--ink-3); line-height: 1.45; }
.unit-arrow { color: var(--ink-3); transition: transform .2s, color .2s; }
.unit-row:hover .unit-arrow { color: var(--teoria); transform: translateX(4px); }

/* --- 9. HOME · PROFESOR --------------------------------------------------- */
.teacher-card {
  position: relative; overflow: hidden; display: grid; grid-template-columns: minmax(0, 1fr); gap: 2.5rem; padding: clamp(1.75rem, 5vw, 3.5rem);
  background: var(--dark-block); color: var(--on-dark); border-radius: var(--radius-lg);
}
@media (min-width: 900px) { .teacher-card { grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); align-items: center; } }
.teacher-card::after { content: ""; position: absolute; inset: 0; background-image: var(--staff-bg); filter: invert(1); opacity: .5; pointer-events: none; -webkit-mask-image: linear-gradient(100deg, transparent 40%, #000); mask-image: linear-gradient(100deg, transparent 40%, #000); }
:root[data-theme="dark"] .teacher-card::after { filter: none; }
.teacher-card > * { position: relative; z-index: 1; }
.teacher-id { display: flex; align-items: center; gap: 1.1rem; }
.teacher-monogram { display: grid; place-items: center; width: 4.6rem; height: 4.6rem; border-radius: 50%; background: var(--on-dark); color: var(--dark-block); font-family: var(--font-heading); font-size: 1.7rem; font-weight: 600; flex: none; }
.teacher-name { font-size: 1.5rem; }
.teacher-role { color: var(--on-dark-2); font-size: .92rem; margin-top: .2rem; }
.teacher-card .eyebrow { color: #FF8D6E; }
.teacher-card .section-title { margin-block: .9rem 1rem; font-size: clamp(1.6rem, 3vw, 2.3rem); }
.teacher-bio { color: var(--on-dark-2); max-width: 38rem; }
.teacher-bio strong { color: var(--on-dark); }
.teacher-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.75rem; }
.teacher-card .btn-primary { background: var(--on-dark); color: #15171C; }
.teacher-card .btn-primary:hover { background: #fff; }
.teacher-card .btn-ghost { color: var(--on-dark); border-color: rgba(255,255,255,.3); }
.teacher-card .btn-ghost:hover { border-color: #fff; background: transparent; }

/* --- 10. PÁGINAS INTERIORES ---------------------------------------------- */
.breadcrumbs { padding-block: 1rem 0; font-size: .85rem; color: var(--ink-3); }
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; }
.breadcrumbs li { display: inline-flex; align-items: center; gap: .4rem; }
.breadcrumbs li + li::before { content: "/"; color: var(--line-strong); }
.breadcrumbs a { text-decoration: none; }
.breadcrumbs a:hover { color: var(--ink); text-decoration: underline; }
.breadcrumbs [aria-current] { color: var(--ink); font-weight: 500; }

.page-hero { --accent: var(--teoria); position: relative; overflow: hidden; padding-block: clamp(2.25rem, 5vw, 4rem) clamp(2.5rem, 5vw, 3.75rem); border-bottom: 1px solid var(--line); isolation: isolate; }
.hero-teoria { --accent: var(--teoria); --accent-soft: var(--teoria-soft); }
.hero-dictados { --accent: var(--dictados); --accent-soft: var(--dictados-soft); }
.hero-solucion { --accent: var(--solucion); --accent-soft: var(--solucion-soft); }
.hero-lenguaje { --accent: var(--lenguaje); --accent-soft: var(--lenguaje-soft); }
.page-hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(100deg, transparent 35%, var(--accent-soft)); opacity: .9; }
.page-hero::after { content: ""; position: absolute; inset: 0; z-index: -1; background-image: var(--staff-bg); -webkit-mask-image: linear-gradient(100deg, transparent 45%, #000); mask-image: linear-gradient(100deg, transparent 45%, #000); }
.page-title { font-size: clamp(2.2rem, 5vw, 3.9rem); letter-spacing: -0.025em; margin-block: 1.1rem 1.1rem; max-width: 18ch; text-wrap: balance; }
.page-lead { font-size: clamp(1rem, 1.4vw, 1.15rem); color: var(--ink-2); max-width: 44rem; }
.page-hero-actions { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.75rem; }
.hero-numeral { position: absolute; right: clamp(1rem, 6vw, 5rem); bottom: -.18em; z-index: -1; font-family: var(--font-heading); font-weight: 500; font-size: clamp(9rem, 22vw, 18rem); line-height: 1; color: var(--accent); opacity: .16; letter-spacing: -0.05em; pointer-events: none; user-select: none; }

/* Tarjetas de documento */
.card { --c: var(--teoria); --c-soft: var(--teoria-soft); display: flex; flex-direction: column; gap: .7rem; padding: 1.4rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-md); transition: border-color .2s, box-shadow .2s, transform .2s; }
.card:hover { border-color: var(--line-strong); box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: .75rem; }
.card-file { font-family: var(--font-mono); font-size: .68rem; color: var(--ink-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.card-title { font-size: 1.2rem; line-height: 1.22; }
.card-desc { font-size: .92rem; color: var(--ink-2); flex: 1; }
.card-actions { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .6rem; }
.card-badge { display: inline-flex; align-items: center; gap: .4rem; flex: none; padding: .28rem .7rem; border-radius: 999px; font-size: .68rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; background: var(--c-soft); color: var(--c); }
.card-badge::before { content: ""; width: .4rem; height: .4rem; border-radius: 50%; background: currentColor; }
.badge-teoria { --c: var(--teoria); --c-soft: var(--teoria-soft); }
.badge-dictado { --c: var(--dictados); --c-soft: var(--dictados-soft); }
.badge-lenguaje { --c: var(--lenguaje); --c-soft: var(--lenguaje-soft); }
.badge-solucion { --c: var(--solucion); --c-soft: var(--solucion-soft); }
.card-meta { font-size: .8rem; color: var(--ink-3); }
.topic-list { display: grid; gap: .4rem; font-size: .88rem; color: var(--ink-2); margin-bottom: .5rem; flex: 1; }
.topic-list li { display: grid; grid-template-columns: auto 1fr; gap: .55rem; align-items: baseline; }
.topic-list li::before { content: ""; width: .35rem; height: .35rem; margin-top: .45rem; border-radius: 50%; background: var(--teoria); }
.card-compact { padding: 1.15rem 1.25rem; }
.card-compact .card-title { font-size: 1.05rem; }
.hub-card .card-title { font-size: 1.45rem; }

/* Reproductor de dictados */
.dictation-player-card { scroll-margin-top: calc(var(--header-h) + 1.25rem); display: flex; flex-direction: column; gap: 1rem; padding: 1.25rem 1.35rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-md); transition: border-color .2s, box-shadow .2s; }
.dictation-player-card:hover { border-color: var(--line-strong); }
.dictation-player-card:target { border-color: var(--dictados); box-shadow: 0 0 0 4px color-mix(in srgb, var(--dictados) 20%, transparent); }
.dictation-header { display: flex; align-items: center; justify-content: space-between; gap: .75rem; }
.dictation-title { font-size: 1.2rem; }
.dictation-badge { flex: none; padding: .25rem .65rem; border-radius: 999px; font-size: .68rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; background: var(--dictados-soft); color: var(--dictados); }
.player-controls { display: flex; align-items: center; flex-wrap: wrap; gap: .55rem .6rem; }
.play-toggle-btn { display: grid; place-items: center; width: 3rem; height: 3rem; flex: none; border: 0; border-radius: 50%; background: var(--ink); color: var(--inverse); transition: background-color .15s, transform .15s; }
.play-toggle-btn:hover { background: var(--dictados); transform: scale(1.05); }
:root[data-theme="dark"] .play-toggle-btn:hover { color: #15171C; }
.play-toggle-btn .icon { width: 1.2rem; height: 1.2rem; }
.play-toggle-btn .icon-play { margin-left: 2px; }
.btn-icon { padding: .45rem .7rem; font-variant-numeric: tabular-nums; }
.player-progress-wrapper { flex: 1 1 9rem; min-width: 8rem; display: grid; gap: .15rem; }
.player-scrubber { width: 100%; height: 1.25rem; margin: 0; cursor: pointer; accent-color: var(--dictados); }
.player-time-display { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: .72rem; color: var(--ink-3); }
.speed-select { padding: .45rem .7rem; border: 1px solid var(--line-strong); border-radius: 999px; background: var(--surface); font-size: .85rem; font-weight: 600; cursor: pointer; }
.player-error { padding: .7rem .9rem; border-radius: var(--radius-sm); background: var(--dictados-soft); color: var(--ink); font-size: .85rem; }
.player-error[hidden] { display: none; }
.player-error a { color: var(--dictados); font-weight: 600; }
.dictation-footer-actions { display: flex; align-items: center; flex-wrap: wrap; gap: .5rem; padding-top: 1rem; border-top: 1px dashed var(--line-strong); }
.dictation-footer-actions .spacer { margin-left: auto; display: flex; gap: .5rem; }
.sol-link-pill { display: inline-flex; align-items: center; gap: .45rem; padding: .45rem .9rem; border-radius: 999px; background: var(--solucion-soft); color: var(--solucion); font-size: .82rem; font-weight: 600; text-decoration: none; }
.sol-link-pill:hover { box-shadow: inset 0 0 0 1.5px var(--solucion); }

/* Visor de documentos */
dialog#doc-preview-modal { width: min(1100px, 94vw); height: min(92vh, 900px); max-width: none; max-height: none; padding: 0; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); color: var(--ink); overflow: hidden; box-shadow: var(--shadow-lg); }
dialog#doc-preview-modal[open] { display: flex; flex-direction: column; }
dialog#doc-preview-modal::backdrop { background: rgba(14, 16, 20, .62); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); }
.modal-header, .modal-footer { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .85rem 1.1rem .85rem 1.5rem; }
.modal-header { border-bottom: 1px solid var(--line); }
.modal-footer { border-top: 1px solid var(--line); justify-content: flex-end; flex-wrap: wrap; padding-right: 1.25rem; }
.modal-title { font-size: 1.15rem; }
.modal-body { flex: 1; min-height: 0; background: var(--surface-2); }
.modal-iframe { width: 100%; height: 100%; border: 0; }

/* --- 11. PIE -------------------------------------------------------------- */
.site-footer { padding-block: clamp(3rem, 6vw, 4.5rem) 1.75rem; background: var(--dark-block); color: var(--on-dark-2); }
.footer-top { display: grid; gap: 2.5rem; grid-template-columns: minmax(0, 1fr); padding-bottom: 3rem; }
@media (min-width: 640px) { .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .footer-top { grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr)); gap: 3rem; } }
.footer-desc { margin-block: 1.25rem; max-width: 24rem; font-size: .92rem; }
.footer-mail { display: inline-flex; align-items: center; gap: .6rem; font-size: .88rem; color: var(--on-dark); text-decoration: none; word-break: break-all; }
.footer-mail:hover span { text-decoration: underline; }
.footer-col-title { margin-bottom: 1.1rem; font-family: var(--font-body); font-size: .74rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--on-dark); }
.footer-links { display: grid; gap: .6rem; font-size: .9rem; }
.footer-links a { text-decoration: none; transition: color .15s; }
.footer-links a:hover { color: #fff; text-decoration: underline; }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 2rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,.12); font-size: .82rem; }

/* --- 12. MOVIMIENTO ------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal { animation: rise .7s cubic-bezier(.2,.7,.2,1) both; }
  .reveal-2 { animation-delay: .08s; }
  .reveal-3 { animation-delay: .16s; }
  @keyframes rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* --- 13. RESPONSIVE ------------------------------------------------------- */
@media (max-width: 899px) {
  .menu-toggle { display: inline-grid; }
  .main-nav { position: absolute; left: 0; right: 0; top: 100%; margin: 0; background: var(--bg); border-bottom: 1px solid var(--line); box-shadow: var(--shadow-md); display: none; }
  .main-nav:has(.nav-links.open) { display: block; }
  .nav-links { flex-direction: column; align-items: stretch; gap: 0; padding: .75rem clamp(1.25rem, 4vw, 2rem) 1.25rem; }
  .nav-link { padding: .95rem .5rem; border-radius: 0; font-size: 1.05rem; border-bottom: 1px solid var(--line); }
  .nav-link.active::after { display: none; }
  .nav-link.active { color: var(--accent); }
  .header-tools { margin-left: auto; }
  .logo-subtitle { display: none; }
}
@media (max-width: 560px) {
  .hero-cta-group .btn { flex: 1 1 100%; }
  .unit-num { font-size: 2.1rem; min-width: 2.8rem; }
  .player-preview { padding: 1.1rem; }
  .a11y-panel { position: fixed; left: 1rem; right: 1rem; top: calc(var(--header-h) + .5rem); width: auto; }
  .dictation-footer-actions .spacer { margin-left: 0; }
}

@media print {
  .site-header, .site-footer, .search-section, .page-hero-actions, .card-actions { display: none !important; }
  body { background: #fff; color: #000; }
}