/* ============================================================
   Escalas y Modos para Guitarra · Hoja de estilos
   Tema oscuro, acentos teal/ámbar/violeta, tipografía Inter.
   Base compartida con el lector de Armonía + widgets propios de
   escalas: cajas de posición, explorador, rueda modal,
   comparador A/B, diagrama de decisión y tabla acorde-escala.
   ============================================================ */

:root {
  color-scheme: dark;
  --bg: #08080a;
  --bg-2: #0d0d10;
  --panel: #141417;
  --panel-2: #18181b;
  --panel-3: #232328;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);

  --text: #f8fafc;
  --muted: #94a3b8;
  --soft: #cbd5e1;

  --teal: #14b8a6;
  --teal-glow: rgba(20, 184, 166, 0.3);
  --amber: #f59e0b;
  --rose: #e11d48;
  --violet: #8b5cf6;
  --green: #22c55e;
  --blue: #38bdf8;

  --role-root: #e11d48;
  --role-third: #f59e0b;
  --role-fifth: #14b8a6;
  --role-seventh: #8b5cf6;
  --role-ext: #22c55e;
  --role-tone: #38bdf8;

  --fn-tonic: #e11d48;
  --fn-sd: #2563eb;
  --fn-dom: #f59e0b;
  --fn-rel: #8b5cf6;
  --fn-sec: #f97316;

  /* colores de modo (oscuro → brillante) */
  --m-locrian: #4c1d95;
  --m-phrygian: #9d174d;
  --m-aeolian: #1d4ed8;
  --m-dorian: #0d9488;
  --m-mixolydian: #ea580c;
  --m-ionian: #eab308;
  --m-lydian: #38bdf8;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.18);
  --shadow: 0 24px 48px -12px rgba(0, 0, 0, 0.55);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --sidebar-w: 320px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(20, 184, 166, 0.08), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(139, 92, 246, 0.07), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
button { cursor: pointer; border: none; outline: none; background: none; color: inherit; }
button:focus-visible, a:focus-visible, [tabindex]:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; border-radius: var(--radius-sm); }
code { background: var(--panel-3); padding: 1px 6px; border-radius: 5px; font-family: 'SFMono-Regular', Consolas, monospace; font-size: 0.88em; color: #99f6e4; }
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #333; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #555; }

/* ---------- Barra superior ---------- */
.topbar {
  position: sticky; top: 0; z-index: 60;
  display: flex; align-items: center; gap: 12px;
  padding: 10px clamp(14px, 3vw, 28px);
  background: rgba(8, 8, 10, 0.86);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar .brand { display: flex; align-items: center; gap: 10px; font-weight: 900; letter-spacing: -0.02em; }
.topbar .brand .logo { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 10px; background: linear-gradient(135deg, var(--teal), var(--violet)); color: #042f2a; box-shadow: 0 4px 14px var(--teal-glow); }
.topbar .brand small { display: block; color: var(--muted); font-size: 0.68rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.topbar .spacer { flex: 1; }
.icon-btn, .back-link {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 38px; padding: 6px 14px;
  border: 1px solid var(--line-strong); border-radius: 999px;
  background: var(--panel-2); color: var(--soft);
  font-size: 0.85rem; font-weight: 700; transition: var(--transition); white-space: nowrap;
}
.icon-btn:hover, .back-link:hover { border-color: var(--teal); background: rgba(20, 184, 166, 0.1); color: #fff; }
.icon-btn svg, .back-link svg { width: 16px; height: 16px; }
#menuToggle { display: none; }
.audio-chip {
  display: inline-flex; align-items: center; gap: 8px; min-height: 38px; padding: 6px 16px;
  border: 1px solid rgba(20, 184, 166, 0.5); border-radius: 999px;
  background: linear-gradient(135deg, var(--teal), #0d9488); color: #042f2a;
  font-size: 0.84rem; font-weight: 800; box-shadow: 0 4px 12px var(--teal-glow); transition: var(--transition);
}
.audio-chip:hover { transform: translateY(-1px); filter: brightness(1.08); }
.audio-chip.on { background: linear-gradient(135deg, var(--green), #16a34a); border-color: rgba(34, 197, 94, 0.5); color: #042f12; }
.instr-chip { display: inline-flex; align-items: center; gap: 8px; min-height: 38px; padding: 6px 14px; border: 1px solid var(--line-strong); border-radius: 999px; background: var(--panel-2); color: var(--soft); font-size: 0.84rem; font-weight: 700; transition: var(--transition); white-space: nowrap; }
.instr-chip:hover { border-color: var(--amber); color: #fff; }
.instr-chip.on { background: linear-gradient(135deg, var(--amber), #d97706); border-color: rgba(245,158,11,0.5); color: #1f1300; }
.instr-chip.loading { opacity: 0.7; pointer-events: none; }
.instr-chip svg { width: 16px; height: 16px; }
.instr-chip.loading svg { animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- App shell ---------- */
.app { display: grid; grid-template-columns: var(--sidebar-w) minmax(0, 1fr); align-items: start; }

/* ---------- Sidebar / índice ---------- */
.sidebar {
  position: sticky; top: 59px; height: calc(100vh - 59px);
  overflow-y: auto; border-right: 1px solid var(--line);
  background: linear-gradient(180deg, var(--bg-2), var(--bg));
  padding: 16px 12px 60px;
}
.toc-search { position: relative; margin-bottom: 14px; }
.toc-search input {
  width: 100%; min-height: 42px; padding: 8px 14px 8px 38px;
  border: 1px solid var(--line); border-radius: var(--radius-md);
  background: var(--bg); color: var(--text); transition: var(--transition);
}
.toc-search input:focus { border-color: var(--teal); box-shadow: 0 0 0 4px rgba(20, 184, 166, 0.12); }
.toc-search svg { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); width: 16px; height: 16px; color: var(--muted); }

.toc-progress { margin: 4px 4px 16px; }
.toc-progress .bar { height: 7px; border-radius: 999px; background: var(--panel-3); overflow: hidden; }
.toc-progress .bar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--teal), var(--green)); transition: width 0.4s ease; }
.toc-progress .lbl { display: flex; justify-content: space-between; margin-top: 6px; color: var(--muted); font-size: 0.72rem; font-weight: 700; }

.tomo { margin-bottom: 6px; border: 1px solid transparent; border-radius: var(--radius-md); }
.tomo-head {
  width: 100%; display: grid; grid-template-columns: 30px minmax(0,1fr) 18px; align-items: center; gap: 8px;
  padding: 10px 10px; border-radius: var(--radius-md); text-align: left; transition: var(--transition);
}
.tomo-head:hover { background: var(--panel-2); }
.tomo-head .tnum { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--panel-3); color: var(--amber); font-weight: 900; font-size: 0.8rem; }
.tomo-head .tt { min-width: 0; }
.tomo-head .tt strong { display: block; font-size: 0.86rem; font-weight: 800; line-height: 1.2; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tomo-head .tt span { display: block; color: var(--muted); font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; }
.tomo-head .chev { color: var(--muted); transition: transform 0.25s ease; }
.tomo.open .tomo-head .chev { transform: rotate(90deg); }
.tomo-body { display: none; padding: 2px 6px 8px; }
.tomo.open .tomo-body { display: block; }
.parte-label { margin: 8px 6px 4px; color: var(--teal); font-size: 0.68rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.08em; }
.toc-cap {
  display: grid; grid-template-columns: 28px minmax(0,1fr) auto; align-items: center; gap: 8px;
  padding: 7px 8px; border-radius: 8px; color: var(--soft); font-size: 0.82rem; transition: var(--transition);
}
.toc-cap:hover { background: var(--panel-2); color: #fff; }
.toc-cap.active { background: rgba(20, 184, 166, 0.12); color: #fff; box-shadow: inset 2px 0 0 var(--teal); }
.toc-cap .cnum { color: var(--muted); font-weight: 800; font-size: 0.74rem; text-align: center; }
.toc-cap.done .cnum::after { content: '✓'; color: var(--green); }
.toc-cap .ctitle { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.toc-cap .badge { font-size: 0.6rem; color: var(--amber); border: 1px solid rgba(245,158,11,0.4); border-radius: 999px; padding: 1px 6px; font-weight: 800; }

/* ---------- Main ---------- */
.content { min-width: 0; padding-bottom: 40px; }
.scrim { display: none; }
.view { max-width: 1180px; margin: 0 auto; padding: 0 clamp(14px, 3vw, 36px); }

/* ---------- Portada ---------- */
.cover {
  position: relative; min-height: calc(100vh - 59px);
  display: grid; align-content: center; gap: 22px;
  padding: clamp(30px, 6vw, 70px) clamp(20px, 6vw, 90px); overflow: hidden; isolation: isolate;
}
.cover::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image: url('https://images.unsplash.com/photo-1525201548942-d8732f6617a0?auto=format&fit=crop&w=1900&q=80');
  background-size: cover; background-position: center; filter: saturate(1.1);
}
.cover::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(110deg, rgba(8,8,10,0.97) 35%, rgba(8,8,10,0.78) 65%, rgba(8,8,10,0.5)); }
.cover .eyebrow {
  display: inline-flex; align-items: center; gap: 8px; width: fit-content; padding: 5px 14px;
  border: 1px solid rgba(20,184,166,0.35); border-radius: 999px; color: var(--teal);
  background: rgba(20,184,166,0.12); font-size: 0.74rem; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase;
}
.cover h1 { margin: 0; max-width: 17ch; font-size: clamp(2.4rem, 6vw, 4.6rem); line-height: 1.02; letter-spacing: -0.035em; font-weight: 900; }
.cover h1 .accent { background: linear-gradient(120deg, var(--teal), var(--violet)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.cover .tagline { max-width: 56ch; color: var(--soft); font-size: clamp(1.05rem, 2vw, 1.35rem); }
.cover .cover-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }
.cover .cover-meta .chip { padding: 6px 14px; border: 1px solid var(--line-strong); border-radius: 999px; background: rgba(20,20,24,0.6); font-size: 0.82rem; font-weight: 700; color: var(--soft); }
.cover .cover-meta .chip strong { color: var(--teal); }
.cover .cover-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 14px; }
.btn-primary, .btn-ghost {
  display: inline-flex; align-items: center; gap: 10px; min-height: 50px; padding: 0 26px;
  border-radius: 999px; font-weight: 800; font-size: 1rem; transition: var(--transition);
}
.btn-primary { background: linear-gradient(135deg, var(--teal), #0d9488); color: #042f2a; box-shadow: 0 8px 24px var(--teal-glow); }
.btn-primary:hover { transform: translateY(-2px); filter: brightness(1.08); }
.btn-ghost { border: 1px solid var(--line-strong); background: rgba(20,20,24,0.6); color: var(--text); }
.btn-ghost:hover { border-color: var(--teal); color: #fff; }

.cover-extra { padding: clamp(30px, 5vw, 56px) 0; display: grid; gap: 26px; }
.section-title { display: flex; align-items: center; gap: 12px; margin: 0 0 4px; font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 900; letter-spacing: -0.02em; }
.section-title i { color: var(--teal); }
.path-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.path-card { padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-md); background: linear-gradient(180deg, var(--panel-2), rgba(24,24,27,0.4)); transition: var(--transition); }
.path-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.path-card .lvl { display: inline-flex; padding: 3px 12px; border-radius: 999px; font-size: 0.72rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.05em; color: #042f2a; background: var(--teal); margin-bottom: 10px; }
.path-card h4 { margin: 0 0 6px; font-size: 1rem; }
.path-card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

/* ---------- Hero de capítulo ---------- */
.chapter-hero {
  position: relative; margin: 22px 0 8px; padding: clamp(26px, 4vw, 48px) clamp(22px, 4vw, 52px);
  border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; isolation: isolate;
  background: linear-gradient(120deg, var(--panel), var(--bg-2));
}
.chapter-hero::after { content: ""; position: absolute; right: -60px; top: -60px; width: 320px; height: 320px; border-radius: 50%; background: radial-gradient(circle, rgba(20,184,166,0.16), transparent 70%); z-index: -1; }
.chapter-hero .crumbs { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: var(--muted); font-size: 0.78rem; font-weight: 700; margin-bottom: 14px; }
.chapter-hero .crumbs .lvl-pill { padding: 3px 10px; border-radius: 999px; background: rgba(245,158,11,0.14); color: var(--amber); font-weight: 800; }
.chapter-hero h1 { margin: 0; font-size: clamp(1.8rem, 4vw, 3rem); line-height: 1.08; letter-spacing: -0.03em; font-weight: 900; }
.chapter-hero .cap-index { display: inline-grid; place-items: center; min-width: 64px; height: 64px; border-radius: 16px; background: linear-gradient(135deg, var(--teal), var(--violet)); color: #042f2a; font-size: 1.6rem; font-weight: 900; box-shadow: 0 6px 20px var(--teal-glow); margin-bottom: 16px; }
.chapter-hero .topic-pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.chapter-hero .topic-pills span { padding: 5px 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--panel-2); color: var(--soft); font-size: 0.8rem; font-weight: 600; }

/* ---------- Paneles / secciones ---------- */
.chapter-body { display: grid; gap: 22px; margin-top: 20px; }
.panel { position: relative; padding: clamp(20px, 3vw, 32px); border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--panel); box-shadow: var(--shadow-sm); overflow: hidden; }
.panel::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent); }
.panel > h2 { display: flex; align-items: center; gap: 12px; margin: 0 0 16px; font-size: clamp(1.25rem, 2.4vw, 1.6rem); font-weight: 800; letter-spacing: -0.01em; }
.panel > h2 i { width: 22px; height: 22px; color: var(--teal); flex-shrink: 0; }
.section-intro { color: var(--soft); margin: -6px 0 18px; font-size: 1.02rem; }
.chapter-section { display: grid; gap: 18px; }
.chapter-section > * { min-width: 0; }

/* ---------- Bloques de contenido ---------- */
.concept-block { padding: 22px 24px; border: 1px solid rgba(20,184,166,0.3); border-radius: var(--radius-lg); background: linear-gradient(120deg, rgba(20,184,166,0.12), rgba(20,184,166,0.02)); }
.concept-eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--teal); font-size: 0.74rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 10px; }
.concept-eyebrow i { width: 16px; height: 16px; }
.concept-block p { margin: 0; font-size: clamp(1.1rem, 2vw, 1.35rem); line-height: 1.45; font-weight: 600; color: #fff; }
.lead { font-size: 1.1rem; color: var(--soft); }
.prose p { margin: 0 0 14px; color: var(--soft); }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: #fff; }

.callout { display: flex; gap: 14px; padding: 16px 18px; border-left: 4px solid var(--teal); border-radius: 0 var(--radius-md) var(--radius-md) 0; background: linear-gradient(90deg, rgba(20,184,166,0.1), rgba(20,184,166,0.02)); color: #e2e8f0; }
.callout i { width: 20px; height: 20px; color: var(--teal); flex-shrink: 0; margin-top: 2px; }
.callout.amber { border-color: var(--amber); background: linear-gradient(90deg, rgba(245,158,11,0.1), rgba(245,158,11,0.02)); }
.callout.amber i { color: var(--amber); }
.callout.rose { border-color: var(--rose); background: linear-gradient(90deg, rgba(225,29,72,0.1), rgba(225,29,72,0.02)); }
.callout.rose i { color: var(--rose); }
.callout.violet { border-color: var(--violet); background: linear-gradient(90deg, rgba(139,92,246,0.1), rgba(139,92,246,0.02)); }
.callout.violet i { color: var(--violet); }

/* fórmula */
.formula-block { padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius-md); background: #0d0d10; }
.formula-name { font-weight: 800; color: var(--amber); margin-bottom: 12px; font-size: 1.05rem; }
.formula-chips { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.fchip { display: grid; gap: 2px; min-width: 50px; padding: 8px 10px; border: 1px solid var(--line-strong); border-radius: var(--radius-sm); background: var(--panel-2); text-align: center; }
.fchip .ftop { color: var(--teal); font-weight: 900; font-size: 0.78rem; }
.fchip .fbot { color: #fff; font-weight: 800; font-size: 1.05rem; }
.fsep { color: var(--muted); font-weight: 900; }
.formula-note { margin-top: 12px; color: var(--muted); font-size: 0.9rem; }

/* ---------- Widget base ---------- */
.widget { margin: 0; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #0c0c0f; box-shadow: inset 0 4px 22px rgba(0,0,0,0.34); }
.widget-cap { display: flex; align-items: center; gap: 8px; color: var(--soft); font-weight: 700; font-size: 0.92rem; margin-bottom: 12px; }
.widget-cap i { width: 16px; height: 16px; color: var(--teal); }
.fb-scroll, .st-scroll { width: 100%; overflow-x: auto; }
.fb-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 14px; }
.fb-play {
  display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 8px 16px;
  border: 1px solid rgba(20,184,166,0.5); border-radius: 999px; background: rgba(20,184,166,0.13);
  color: #99f6e4; font-weight: 800; font-size: 0.85rem; transition: var(--transition);
}
.fb-play:hover { background: rgba(20,184,166,0.24); color: #fff; transform: translateY(-1px); }
.fb-play .ic { font-size: 0.7rem; }
.fb-play.playing { background: var(--teal); color: #042f2a; }
.fb-play[data-drone].droning { background: var(--violet); color: #fff; border-color: var(--violet); box-shadow: 0 0 0 3px rgba(139,92,246,0.3); }
.fb-toggle { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.fb-lbl { padding: 8px 14px; font-size: 0.8rem; font-weight: 700; color: var(--muted); transition: var(--transition); }
.fb-lbl.on { background: var(--panel-3); color: #fff; }
.fb-lbl:hover { color: #fff; }

/* ---------- Diapasón ---------- */
/* Los SVG llevan width/height propios → tamaño natural; max-width evita que se estiren al ancho del panel. */
.fb-svg { display: block; min-width: 0; max-width: 100%; height: auto; }
.box-svg { min-width: 0; }
.fb-fretnum { fill: var(--muted); font-size: 12px; font-weight: 800; }
.fb-strlbl { fill: #c9b89a; font-size: 12px; font-weight: 800; }
.fb-dot { cursor: pointer; }
.fb-dot circle { fill: #2b2b30; stroke: rgba(0,0,0,0.5); stroke-width: 1; transition: transform 0.12s ease, filter 0.12s ease; transform-box: fill-box; transform-origin: center; }
.fb-dot .fb-txt { fill: #fff; font-size: 11px; font-weight: 800; pointer-events: none; }
.fb-dot:hover circle, .fb-dot.flash circle { filter: brightness(1.35); transform: scale(1.18); }
.fb-dot.root circle { fill: var(--role-root); }
.fb-dot.third circle { fill: var(--role-third); } .fb-dot.third .fb-txt { fill: #1f1300; }
.fb-dot.fifth circle { fill: var(--role-fifth); } .fb-dot.fifth .fb-txt { fill: #042f2a; }
.fb-dot.seventh circle { fill: var(--role-seventh); }
.fb-dot.ext circle { fill: var(--role-ext); } .fb-dot.ext .fb-txt { fill: #042f12; }
.fb-dot.tone circle { fill: var(--role-tone); } .fb-dot.tone .fb-txt { fill: #04212f; }
.fb-dot.ghost circle { fill: transparent; stroke: rgba(255,255,255,0.22); }
.fb-dot.ghost .fb-txt { fill: rgba(255,255,255,0.4); }
/* nota iluminada al sonar (reproducción animada) */
.fb-dot.lit circle { filter: brightness(1.7) drop-shadow(0 0 7px rgba(255,255,255,0.75)); transform: scale(1.4); }
.fb-dot.lit .fb-txt { fill: #fff; }
.st-note.lit ellipse { fill: var(--amber); filter: drop-shadow(0 0 6px rgba(245,158,11,0.85)); }
.tab-note { transition: none; }
.tab-note.lit rect { fill: var(--amber); }
.tab-note.lit .tab-num { fill: #1f1300; }
.fb-legend { display: flex; flex-wrap: wrap; gap: 10px 16px; margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); }
.lg-item { display: inline-flex; align-items: center; gap: 6px; font-size: 0.8rem; font-weight: 700; color: var(--soft); }
.lg-item small { color: var(--muted); font-weight: 600; }
.lg-dot { width: 12px; height: 12px; border-radius: 50%; }
.lg-item.root .lg-dot { background: var(--role-root); }
.lg-item.third .lg-dot { background: var(--role-third); }
.lg-item.fifth .lg-dot { background: var(--role-fifth); }
.lg-item.seventh .lg-dot { background: var(--role-seventh); }
.lg-item.ext .lg-dot { background: var(--role-ext); }
.lg-item.tone .lg-dot { background: var(--role-tone); }

/* ---------- Explorador ---------- */
.explorer-widget { border-color: rgba(139,92,246,0.3); }
.expl-controls { display: grid; gap: 12px; margin-bottom: 14px; }
.expl-group { display: grid; gap: 6px; }
.expl-lbl { color: var(--muted); font-size: 0.7rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.06em; }
.expl-roots, .expl-scales { display: flex; flex-wrap: wrap; gap: 6px; }
.expl-root, .expl-scale { padding: 6px 12px; border: 1px solid var(--line-strong); border-radius: 999px; background: var(--panel-2); color: var(--soft); font-size: 0.8rem; font-weight: 700; transition: var(--transition); }
.expl-root:hover, .expl-scale:hover { border-color: var(--violet); color: #fff; }
.expl-root.on { background: var(--teal); color: #042f2a; border-color: var(--teal); }
.expl-scale.on { background: var(--violet); color: #fff; border-color: var(--violet); }

/* ---------- Diagramas de acorde ---------- */
.chord-row { display: flex; flex-wrap: wrap; gap: 14px; }
.cd-widget { width: 168px; padding: 12px; text-align: center; cursor: pointer; transition: var(--transition); }
.cd-widget:hover { border-color: var(--teal); transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,0,0,0.3); }
.cd-name { font-weight: 900; font-size: 1.05rem; margin-bottom: 4px; }
.cd-svg { display: block; width: 130px; height: auto; margin: 0 auto; }
.cd-svg .cd-base { fill: var(--amber); font-size: 11px; font-weight: 800; }
.cd-svg .cd-mark { font-size: 13px; font-weight: 900; }
.cd-svg .cd-mark.mute { fill: #ef4444; }
.cd-svg .cd-dot { fill: var(--teal); }
.cd-svg .cd-dot.root { fill: var(--role-root); }
.cd-svg .cd-fing { fill: #042f2a; font-size: 10px; font-weight: 900; }
.cd-notes { color: var(--muted); font-size: 0.78rem; margin-top: 6px; }
.cd-play { margin-top: 8px; color: #99f6e4; font-size: 0.74rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.04em; }
.cd-play .ic { font-size: 0.62rem; }

/* ---------- Pentagrama / tab ---------- */
.st-svg { display: block; min-width: 0; max-width: 100%; height: auto; margin: 0 auto; }
.st-clef { fill: #f6f7fb; font-size: 56px; font-family: Georgia, serif; }
.st-acc { fill: #fde68a; font-size: 18px; font-weight: 900; }
.st-lbl { fill: var(--soft); font-size: 12px; font-weight: 800; }
.st-note { cursor: pointer; }
.st-note:hover ellipse { fill: var(--amber); }
.tab-svg { display: block; min-width: 0; max-width: 100%; height: auto; }
.tab-clef { fill: var(--muted); font-size: 12px; font-weight: 800; }
.tab-num { fill: #fff; font-size: 13px; font-weight: 900; }
.tab-lbl { fill: var(--muted); font-size: 10px; font-weight: 700; }

/* ---------- Piano ---------- */
.pn-svg { display: block; max-width: 100%; height: auto; }
.pn-key { cursor: pointer; }
.pn-key.white rect { fill: #f1f1ee; stroke: #1a1a1a; stroke-width: 1; }
.pn-key.black rect { fill: #1c1c20; stroke: #000; }
.pn-key:hover.white rect { fill: #dbeafe; }
.pn-key:hover.black rect { fill: #334155; }
.pn-key.white.root rect { fill: var(--role-root); } .pn-key.black.root rect { fill: var(--role-root); }
.pn-key.white.third rect { fill: var(--role-third); } .pn-key.black.third rect { fill: var(--role-third); }
.pn-key.white.fifth rect { fill: var(--role-fifth); } .pn-key.black.fifth rect { fill: var(--role-fifth); }
.pn-key.white.seventh rect { fill: var(--role-seventh); } .pn-key.black.seventh rect { fill: var(--role-seventh); }
.pn-key.white.ext rect { fill: var(--role-ext); } .pn-key.black.ext rect { fill: var(--role-ext); }
.pn-key.white.tone rect { fill: var(--role-tone); } .pn-key.black.tone rect { fill: var(--role-tone); }
.pn-lbl { fill: #042f2a; font-size: 10px; font-weight: 900; }
.pn-lbl.black { fill: #fff; }

/* ---------- Progresión ---------- */
.prog-row { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.prog-chip { display: grid; gap: 2px; min-width: 86px; padding: 12px 14px; border: 1px solid var(--line-strong); border-radius: var(--radius-md); background: var(--panel-2); transition: var(--transition); }
.prog-chip:hover { transform: translateY(-2px); border-color: var(--teal); }
.prog-chip.playing { transform: translateY(-3px) scale(1.04); box-shadow: 0 0 0 2px var(--teal), 0 8px 18px rgba(0,0,0,0.4); }
.prog-roman { font-size: 0.74rem; font-weight: 900; letter-spacing: 0.04em; }
.prog-name { font-size: 1.05rem; font-weight: 800; color: #fff; }
.prog-chip.fn-tonic { box-shadow: inset 0 -3px 0 var(--fn-tonic); } .prog-chip.fn-tonic .prog-roman { color: var(--fn-tonic); }
.prog-chip.fn-sd { box-shadow: inset 0 -3px 0 var(--fn-sd); } .prog-chip.fn-sd .prog-roman { color: #60a5fa; }
.prog-chip.fn-dom { box-shadow: inset 0 -3px 0 var(--fn-dom); } .prog-chip.fn-dom .prog-roman { color: var(--fn-dom); }
.prog-chip.fn-rel { box-shadow: inset 0 -3px 0 var(--fn-rel); } .prog-chip.fn-rel .prog-roman { color: var(--fn-rel); }
.prog-chip.fn-sec { box-shadow: inset 0 -3px 0 var(--fn-sec); } .prog-chip.fn-sec .prog-roman { color: var(--fn-sec); }
.prog-arrow { color: var(--muted); font-weight: 900; }
.prog-key { color: var(--muted); font-size: 0.85rem; }
.prog-key strong { color: var(--amber); }

/* ---------- Visor de intervalo ---------- */
.iv-svg { display: block; max-width: 480px; height: auto; margin: 0 auto; }
.iv-node { cursor: pointer; }
.iv-node circle.root { fill: var(--role-root); } .iv-node circle.third { fill: var(--role-third); }
.iv-t { fill: #fff; font-size: 13px; font-weight: 900; }
.iv-name { fill: #fde68a; font-size: 13px; font-weight: 800; }

/* ---------- Rueda modal ---------- */
.cw-svg { display: block; max-width: 460px; width: 100%; height: auto; }
.cw-seg { cursor: pointer; }
.cw-seg path { stroke: #0c0c0f; stroke-width: 2; transition: filter 0.15s ease, transform 0.15s ease; transform-box: fill-box; transform-origin: center; }
.cw-seg:hover path, .cw-seg.flash path { filter: brightness(1.25); }
.cw-seg .cw-lbl { fill: #fff; font-size: 14px; font-weight: 800; pointer-events: none; paint-order: stroke; stroke: rgba(0,0,0,0.55); stroke-width: 2.5px; }
.cw-seg.mode-locrian path { fill: var(--m-locrian); }
.cw-seg.mode-phrygian path { fill: var(--m-phrygian); }
.cw-seg.mode-aeolian path { fill: var(--m-aeolian); }
.cw-seg.mode-dorian path { fill: var(--m-dorian); }
.cw-seg.mode-mixolydian path { fill: var(--m-mixolydian); }
.cw-seg.mode-ionian path { fill: var(--m-ionian); }
.cw-seg.mode-lydian path { fill: var(--m-lydian); }
.cw-center-t { fill: #fff; font-size: 30px; font-weight: 900; }
.cw-center-s { fill: var(--muted); font-size: 12px; font-weight: 700; }
.cw-axis { fill: var(--soft); font-size: 12px; font-weight: 700; }
.cw-note { margin-top: 12px; color: var(--soft); font-size: 0.9rem; text-align: center; }
.cw-note strong { color: var(--amber); }

/* ---------- Comparador A/B ---------- */
.cmp-grid { display: grid; grid-template-columns: 1fr auto 1fr; align-items: stretch; gap: 12px; }
.cmp-card { padding: 16px; border: 1px solid var(--line-strong); border-radius: var(--radius-md); background: var(--panel-2); display: grid; gap: 10px; align-content: start; }
.cmp-card.a { border-left: 4px solid var(--teal); }
.cmp-card.b { border-left: 4px solid var(--amber); }
.cmp-name { font-weight: 800; font-size: 1.05rem; color: #fff; }
.cmp-degs { display: flex; flex-wrap: wrap; gap: 5px; }
.cmp-deg { display: inline-flex; align-items: baseline; gap: 4px; padding: 4px 8px; border-radius: 6px; background: var(--panel-3); font-size: 0.78rem; font-weight: 700; color: var(--soft); }
.cmp-deg b { color: var(--teal); font-size: 0.7rem; }
.cmp-vs { display: grid; place-items: center; color: var(--muted); font-weight: 900; font-size: 0.9rem; }
.cmp-diff { color: var(--soft); font-size: 0.85rem; }
.cmp-diff strong { color: var(--amber); }

/* ---------- Diagrama de decisión ---------- */
.flow-widget { border-color: rgba(245,158,11,0.3); }
.flow-stack { display: grid; gap: 4px; }
.flow-node { padding: 14px 16px; border: 1px solid var(--line-strong); border-radius: var(--radius-md); background: linear-gradient(180deg, var(--panel-2), rgba(24,24,27,0.5)); transition: var(--transition); }
.flow-node:hover { border-color: var(--amber); transform: translateX(4px); }
.flow-q { display: flex; align-items: center; gap: 10px; font-weight: 800; color: #fff; font-size: 1rem; }
.flow-num { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: rgba(245,158,11,0.16); color: var(--amber); font-weight: 900; font-size: 0.8rem; flex-shrink: 0; }
.flow-a { margin-top: 6px; padding-left: 36px; color: var(--soft); font-size: 0.9rem; }
.flow-arrow { display: grid; place-items: center; color: var(--amber); }
.flow-arrow i { width: 18px; height: 18px; }
.flow-result { margin-top: 12px; display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-radius: var(--radius-md); background: rgba(34,197,94,0.1); border: 1px solid rgba(34,197,94,0.3); color: #bbf7d0; font-weight: 700; }
.flow-result i { width: 20px; height: 20px; color: var(--green); }
.flow-result strong { color: #fff; }

/* ---------- Modo Jam ---------- */
.jam-widget { border-color: rgba(225,29,72,0.32); background: linear-gradient(180deg, #100c0e, #0c0c0f); }
.jam-widget .widget-cap i { color: var(--rose); }
.jam-transport { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 14px; }
.jam-play { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 8px 20px; border: 1px solid rgba(225,29,72,0.5); border-radius: 999px; background: linear-gradient(135deg, var(--rose), #be123c); color: #fff; font-weight: 800; font-size: 0.9rem; transition: var(--transition); }
.jam-play:hover { filter: brightness(1.1); transform: translateY(-1px); }
.jam-widget.jamming .jam-play { background: linear-gradient(135deg, var(--green), #16a34a); border-color: rgba(34,197,94,0.5); box-shadow: 0 0 0 3px rgba(34,197,94,0.25); }
.jam-tempo { display: inline-flex; align-items: center; gap: 8px; color: var(--soft); font-size: 0.84rem; font-weight: 700; }
.jam-tempo i { width: 16px; height: 16px; color: var(--muted); }
.jam-tempo input[type=range] { width: 120px; accent-color: var(--rose); cursor: pointer; }
.jam-bpm { min-width: 64px; color: #fff; font-weight: 800; }
.jam-styles { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.jam-style { padding: 7px 13px; font-size: 0.78rem; font-weight: 700; color: var(--muted); transition: var(--transition); }
.jam-style:hover { color: #fff; }
.jam-style.on { background: var(--rose); color: #fff; }
.jam-chords { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-bottom: 14px; }
.jam-chip { display: grid; gap: 2px; min-width: 76px; padding: 10px 12px; border: 1px solid var(--line-strong); border-radius: var(--radius-md); background: var(--panel-2); transition: var(--transition); }
.jam-chip.playing { transform: translateY(-3px) scale(1.05); box-shadow: 0 0 0 2px var(--rose), 0 8px 18px rgba(0,0,0,0.4); border-color: var(--rose); }
.jam-scale-lbl { display: flex; align-items: center; gap: 8px; color: var(--soft); font-size: 0.9rem; margin-bottom: 10px; }
.jam-scale-lbl i { width: 16px; height: 16px; color: var(--teal); }
.jam-scale-lbl strong { color: var(--amber); }

/* ---------- Entrenador auditivo ---------- */
.trainer-widget { border-color: rgba(139,92,246,0.32); }
.trainer-widget .widget-cap i { color: var(--violet); }
.tr-scoreboard { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 12px; color: var(--soft); font-size: 0.85rem; }
.tr-scoreboard strong { color: #fff; font-size: 1.05rem; }
.tr-streak strong { color: var(--amber); }
.tr-controls { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 12px; }
.tr-next { display: inline-flex; align-items: center; gap: 6px; min-height: 40px; padding: 8px 16px; border: 1px solid var(--line-strong); border-radius: 999px; background: var(--panel-2); color: var(--soft); font-weight: 700; transition: var(--transition); }
.tr-next:hover { border-color: var(--violet); color: #fff; }
.tr-next i { width: 16px; height: 16px; }
.tr-options { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.tr-hint { grid-column: 1 / -1; color: var(--muted); }
.tr-opt { padding: 13px 14px; border: 1px solid var(--line-strong); border-radius: var(--radius-md); background: var(--panel-2); color: var(--soft); font-weight: 600; text-align: center; transition: var(--transition); }
.tr-opt:hover { border-color: var(--violet); color: #fff; }
.tr-opt.correct { background: rgba(34,197,94,0.16); border-color: var(--green); color: #fff; }
.tr-opt.wrong { background: rgba(225,29,72,0.14); border-color: var(--rose); color: #fff; }
.tr-feedback { margin-top: 12px; font-weight: 800; }
.tr-feedback.ok { color: var(--green); }
.tr-feedback.no { color: var(--rose); }

/* ---------- Círculo de quintas interactivo ---------- */
.cof-layout { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 18px; align-items: start; }
.cof-circle { display: grid; place-items: center; }
.cof-svg { max-width: 100%; height: auto; }
.cof-node { cursor: pointer; }
.cof-node .cof-o { fill: #18181b; stroke: var(--line-strong); stroke-width: 1.5; transition: var(--transition); }
.cof-node:hover .cof-o { stroke: var(--teal); filter: brightness(1.2); }
.cof-node.sel .cof-o { fill: var(--teal); stroke: var(--teal); }
.cof-major { fill: #fff; font-size: 14px; font-weight: 800; pointer-events: none; }
.cof-node.sel .cof-major { fill: #042f2a; }
.cof-minor { fill: var(--muted); font-size: 11px; font-weight: 700; pointer-events: none; }
.cof-center { fill: var(--amber); font-size: 12px; font-weight: 800; pointer-events: none; }
.cof-detail { display: grid; gap: 14px; min-width: 0; }
.cof-key-name { color: var(--soft); font-size: 0.95rem; }
.cof-key-name strong { color: var(--amber); }
@media (max-width: 820px) { .cof-layout { grid-template-columns: 1fr; } .cof-circle { order: -1; } }

/* ---------- Tabla acorde-escala ---------- */
.cs-table td { vertical-align: top; }
.cs-chord { margin-bottom: 4px; }
.cs-cname { color: var(--muted); font-size: 0.72rem; }
.cs-rec { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 8px; }
.cs-rec:last-child { margin-bottom: 0; }
.cs-play { min-height: 32px; padding: 5px 12px; font-size: 0.8rem; }
.cs-note { color: var(--soft); font-size: 0.85rem; }

/* ---------- Cards / steps / table ---------- */
.cards { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 14px; }
.cards.three { grid-template-columns: repeat(3, minmax(0,1fr)); }
.cards.one { grid-template-columns: 1fr; }
.mini-card { padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-md); background: linear-gradient(180deg, var(--panel-2), rgba(24,24,27,0.4)); transition: var(--transition); }
.mini-card:hover { transform: translateY(-2px); border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.mini-card .mc-ic { width: 22px; height: 22px; color: var(--teal); margin-bottom: 8px; }
.mini-card h4 { margin: 0 0 6px; font-size: 1rem; }
.mini-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.tag { display: inline-flex; padding: 3px 10px; border-radius: 999px; background: var(--panel-3); color: var(--text); font-size: 0.72rem; font-weight: 800; }
.tag.teal { background: rgba(20,184,166,0.12); color: var(--teal); }
.tag.amber { background: rgba(245,158,11,0.12); color: var(--amber); }
.tag.violet { background: rgba(139,92,246,0.14); color: #c4b5fd; }
/* pastillas de emoción */
.tag.mood-bright { background: rgba(234,179,8,0.16); color: #fde047; }
.tag.mood-warm { background: rgba(234,88,12,0.16); color: #fdba74; }
.tag.mood-dark { background: rgba(139,92,246,0.16); color: #c4b5fd; }

.timeline { display: grid; gap: 12px; counter-reset: step; }
.step { display: grid; grid-template-columns: 46px 1fr; gap: 14px; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--panel-2); counter-increment: step; transition: var(--transition); }
.step:hover { border-color: var(--line-strong); transform: translateX(4px); }
.step::before { content: counter(step, decimal-leading-zero); display: grid; place-items: center; width: 46px; height: 46px; border-radius: 50%; background: rgba(245,158,11,0.1); color: var(--amber); font-weight: 900; border: 1px solid rgba(245,158,11,0.3); }
.step h4 { margin: 0 0 4px; font-size: 1.05rem; }
.step p { margin: 0; color: var(--soft); font-size: 0.92rem; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--panel-2); }
table { width: 100%; min-width: 520px; border-collapse: collapse; }
th, td { padding: 13px 16px; text-align: left; vertical-align: top; }
th { background: rgba(0,0,0,0.25); color: var(--muted); font-size: 0.74rem; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase; border-bottom: 1px solid var(--line-strong); }
td { color: var(--soft); font-size: 0.92rem; border-bottom: 1px solid var(--line); }
tr:last-child td { border-bottom: 0; }
tr:hover td { background: rgba(255,255,255,0.02); }

.photo-panel { position: relative; display: grid; align-items: end; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-lg); background-size: cover; background-position: center; isolation: isolate; }
.photo-panel::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg, rgba(8,8,10,0.94), rgba(8,8,10,0.55), transparent); }
.photo-panel figcaption { max-width: 640px; padding: clamp(20px, 4vw, 36px); }
.photo-panel h4 { margin: 0 0 8px; font-size: clamp(1.2rem, 2.4vw, 1.7rem); font-weight: 800; }
.photo-panel p { margin: 0; color: var(--soft); }

.sound-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 10px; }
.sound-button { display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 10px 16px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--panel-2); color: var(--soft); font-weight: 600; font-size: 0.92rem; transition: var(--transition); text-align: left; }
.sound-button i { width: 18px; height: 18px; color: var(--teal); flex-shrink: 0; }
.sound-button:hover { background: var(--panel-3); border-color: var(--teal); color: #fff; transform: translateY(-2px); }
.sound-button[data-drone].droning { border-color: var(--violet); background: rgba(139,92,246,0.18); color: #fff; }

/* ---------- Ejercicios ---------- */
.exercise { padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--panel-2); border-left: 4px solid var(--teal); display: grid; gap: 12px; }
.exercise.oido { border-left-color: var(--violet); }
.exercise.composicion { border-left-color: var(--amber); }
.ex-head { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.05rem; }
.ex-head i { width: 18px; height: 18px; color: var(--teal); }
.exercise.oido .ex-head i { color: var(--violet); }
.exercise.composicion .ex-head i { color: var(--amber); }
.ex-steps { margin: 0; padding-left: 20px; color: var(--soft); display: grid; gap: 6px; }
.ex-steps li { padding-left: 4px; }

/* ---------- Errores ---------- */
.errors-grid { display: grid; gap: 12px; }
.err-card { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.err-wrong, .err-right { display: flex; gap: 8px; padding: 14px 16px; border-radius: var(--radius-md); font-size: 0.92rem; }
.err-wrong { background: rgba(225,29,72,0.08); border: 1px solid rgba(225,29,72,0.25); color: #fecdd3; }
.err-right { background: rgba(34,197,94,0.08); border: 1px solid rgba(34,197,94,0.25); color: #bbf7d0; }
.err-wrong i, .err-right i { width: 18px; height: 18px; flex-shrink: 0; margin-top: 2px; }
.err-wrong i { color: var(--rose); } .err-right i { color: var(--green); }

/* ---------- Resumen ---------- */
.summary-block { padding: 4px; }
.summary-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; }
.summary-box { padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius-md); background: linear-gradient(180deg, var(--panel-2), rgba(24,24,27,0.4)); }
.summary-box span { display: block; color: var(--muted); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase; }
.summary-box strong { display: block; margin-top: 6px; color: #fff; font-size: 1.05rem; }

/* ---------- Quiz ---------- */
.quiz-block { padding: 20px 22px; border: 1px solid rgba(139,92,246,0.32); border-radius: var(--radius-lg); background: linear-gradient(120deg, rgba(139,92,246,0.1), rgba(139,92,246,0.02)); display: grid; gap: 14px; }
.quiz-head { display: flex; align-items: center; gap: 10px; color: #c4b5fd; font-weight: 800; font-size: 0.8rem; letter-spacing: 0.06em; text-transform: uppercase; }
.quiz-head i { width: 18px; height: 18px; }
.quiz-q { margin: 0; font-size: 1.15rem; font-weight: 700; color: #fff; }
.quiz-play { width: fit-content; }
.quiz-opts { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 10px; }
.quiz-opt { padding: 14px 16px; border: 1px solid var(--line-strong); border-radius: var(--radius-md); background: var(--panel-2); color: var(--soft); font-weight: 600; text-align: left; transition: var(--transition); }
.quiz-opt:hover { border-color: var(--violet); color: #fff; }
.quiz-opt.correct { background: rgba(34,197,94,0.16); border-color: var(--green); color: #fff; }
.quiz-opt.wrong { background: rgba(225,29,72,0.14); border-color: var(--rose); color: #fff; }
.quiz-feedback { font-weight: 800; }
.quiz-feedback.ok { color: var(--green); }
.quiz-feedback.no { color: var(--rose); }
.quiz-explain { color: var(--soft); border-top: 1px solid var(--line); padding-top: 12px; }

.svg-illus svg { display: block; max-width: min(100%, 480px); height: auto; margin: 0 auto; }
.cols-2 { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.cols-2 .col { display: grid; gap: 16px; align-content: start; }
.block-divider { height: 1px; background: linear-gradient(90deg, transparent, var(--line-strong), transparent); margin: 6px 0; }

/* ---------- Andamiaje (capítulo en desarrollo) ---------- */
.scaffold-note { display: flex; gap: 14px; padding: 18px 20px; border: 1px dashed rgba(245,158,11,0.4); border-radius: var(--radius-md); background: rgba(245,158,11,0.06); color: #fde68a; }
.scaffold-note i { width: 22px; height: 22px; flex-shrink: 0; }
.topics-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.topic-item { display: grid; grid-template-columns: 26px 1fr; gap: 10px; align-items: center; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--panel-2); }
.topic-item .ti-num { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 8px; background: rgba(20,184,166,0.12); color: var(--teal); font-weight: 900; font-size: 0.78rem; }
.template-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 8px; }
.template-list .ti { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel-2); color: var(--soft); font-size: 0.84rem; }
.template-list .ti span { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 6px; background: var(--panel-3); color: var(--amber); font-weight: 800; font-size: 0.72rem; }

/* ---------- Paginador ---------- */
.pager { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; margin-top: 30px; }
.pager-link { flex: 1 1 260px; display: grid; gap: 4px; padding: 16px 20px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--panel); transition: var(--transition); }
.pager-link:hover { border-color: var(--teal); background: rgba(20,184,166,0.07); transform: translateY(-2px); }
.pager-link span { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase; }
.pager-link.next { text-align: right; } .pager-link.next span { justify-content: flex-end; }
.pager-link strong { color: #fff; font-size: 1rem; }
.pager-link.done-btn { flex-basis: 100%; }
.mark-done { display: inline-flex; align-items: center; justify-content: center; gap: 10px; width: 100%; min-height: 50px; border-radius: var(--radius-md); border: 1px solid rgba(34,197,94,0.4); background: rgba(34,197,94,0.1); color: #bbf7d0; font-weight: 800; transition: var(--transition); }
.mark-done:hover { background: rgba(34,197,94,0.2); color: #fff; }
.mark-done.is-done { background: rgba(34,197,94,0.2); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .app { grid-template-columns: 1fr; }
  #menuToggle { display: inline-flex; }
  .sidebar { position: fixed; top: 59px; left: 0; width: min(86vw, var(--sidebar-w)); z-index: 55; transform: translateX(-105%); transition: transform 0.3s ease; box-shadow: var(--shadow); }
  .app.menu-open .sidebar { transform: translateX(0); }
  .scrim { display: block; position: fixed; inset: 59px 0 0; background: rgba(0,0,0,0.55); z-index: 54; opacity: 0; pointer-events: none; transition: opacity 0.3s ease; }
  .app.menu-open .scrim { opacity: 1; pointer-events: auto; }
}
@media (max-width: 720px) {
  .cards, .cards.three, .err-card, .cols-2, .quiz-opts { grid-template-columns: 1fr; }
  .cmp-grid { grid-template-columns: 1fr; }
  .cmp-vs { padding: 4px; }
  .topbar .brand small { display: none; }
  .chapter-body { gap: 16px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }