/* ════════════════════════════════════════════════════════════
   Historia Trivia — Estilos globales
   Mobile-first · Dark mode automático · Accesible
   ════════════════════════════════════════════════════════════ */

/* ── Variables de diseño ─────────────────────────────────── */
:root {
  /* Paleta base (modo claro) */
  --bg:      #f4f1ea;
  --panel:   #fffdf8;
  --ink:     #241c14;
  --muted:   #6b5c47;
  --accent:  #8a3324;
  --accent2: #c9a227;
  --line:    #e2d8c3;
  --good:    #3a6b35;
  --bad:     #a3342a;

  /* Fondos de cursos */
  --grad-1eso:  linear-gradient(135deg,#c9a227 0%,#8a5a2b 55%,#4a3319 100%);
  --grad-2eso:  linear-gradient(135deg,#5c6670 0%,#33404a 55%,#1c242b 100%);
  --grad-3eso:  linear-gradient(135deg,#1f6f78 0%,#0f4750 55%,#082830 100%);
  --grad-4eso:  linear-gradient(135deg,#6b2a24 0%,#3c1512 55%,#1e0a08 100%);
  --grad-1bach: linear-gradient(135deg,#26415c 0%,#152a3d 55%,#0a1622 100%);
  --grad-2bach: linear-gradient(135deg,#8a3324 0%,#5c1f16 55%,#3a120c 100%);

  /* Tokens de diseño */
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --shadow-sm: 0 1px 3px rgba(36,28,20,.08);
  --shadow-md: 0 4px 16px rgba(36,28,20,.12);
  --shadow-lg: 0 8px 32px rgba(36,28,20,.16);
  --transition: 200ms cubic-bezier(.4,0,.2,1);
  --font-serif: Georgia, 'Iowan Old Style', 'Palatino Linotype', serif;
  --font-ui:    system-ui, -apple-system, sans-serif;

  /* Safe area (iOS) */
  --sat: env(safe-area-inset-top,    0px);
  --sab: env(safe-area-inset-bottom, 0px);
  --sal: env(safe-area-inset-left,   0px);
  --sar: env(safe-area-inset-right,  0px);
}

/* Dark mode automático */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:    #1b1712;
    --panel: #252019;
    --ink:   #f1e9da;
    --muted: #b3a488;
    --accent:  #d97a5f;
    --accent2: #e0b84a;
    --line:  #3a322580;
    --good:  #7fc47a;
    --bad:   #e07a6e;
  }
}
:root[data-theme="dark"] {
  --bg:    #1b1712;
  --panel: #252019;
  --ink:   #f1e9da;
  --muted: #b3a488;
  --accent:  #d97a5f;
  --accent2: #e0b84a;
  --line:  #3a322580;
  --good:  #7fc47a;
  --bad:   #e07a6e;
}

/* ── Reset y base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  height: 100%;
  scroll-padding-top: var(--sat);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif);
  line-height: 1.6;
  display: flex;
  justify-content: center;
  padding-top: var(--sat);
  padding-bottom: var(--sab);
  padding-left: var(--sal);
  padding-right: var(--sar);
}

/* ── Contenedor principal ─────────────────────────────────── */
#app {
  width: 100%;
  max-width: 640px;
  padding: 0 0 80px;
  position: relative;
}

/* ── Pantallas (router) ───────────────────────────────────── */
.screen {
  display: none;
  animation: screenIn var(--transition) both;
}
.screen.active { display: block; }

@keyframes screenIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: none; }
}

/* ── Tarjetas ─────────────────────────────────────────────── */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
}
.card--flush { padding: 0; overflow: hidden; }
.card--hero  { padding: 24px 20px; }

/* ── Banda de era (cabecera de quiz) ─────────────────────── */
.era-band {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  margin: -20px -20px 18px;
  padding: 14px 20px;
  color: #fff;
}
.era-band__icon {
  position: absolute;
  right: -16px; bottom: -16px;
  width: 80px; height: 80px;
  opacity: .22;
  color: #fff;
}
.era-band__text {
  position: relative;
  z-index: 1;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-family: var(--font-ui);
  font-weight: 600;
}

/* ── Hero card ────────────────────────────────────────────── */
.hero-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  padding: 28px 24px 26px;
  color: #fff;
  margin: 16px 16px 14px;
  box-shadow: var(--shadow-lg);
}
.hero-card__icon {
  position: absolute;
  right: -24px; bottom: -24px;
  width: 170px; height: 170px;
  opacity: .18;
  color: #fff;
  pointer-events: none;
}
.hero-card__eyebrow {
  position: relative;
  z-index: 1;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  opacity: .85;
  font-family: var(--font-ui);
  margin-bottom: 4px;
}
.hero-card__title {
  position: relative;
  z-index: 1;
  font-size: 1.5rem;
  font-weight: normal;
  margin-bottom: 4px;
}
.hero-card__sub {
  position: relative;
  z-index: 1;
  opacity: .88;
  font-size: .9rem;
}

/* ── Tipografía ───────────────────────────────────────────── */
h1, h2, h3 { font-weight: normal; letter-spacing: .3px; }
h1 { font-size: 1.55rem; }
h2 { font-size: 1.2rem; margin-bottom: 14px; }
h3 { font-size: 1rem; }

.label {
  display: block;
  font-size: .78rem;
  color: var(--muted);
  font-family: var(--font-ui);
  text-transform: uppercase;
  letter-spacing: .8px;
  margin-bottom: 6px;
}
.muted   { color: var(--muted); font-size: .88rem; }
.caption { color: var(--muted); font-size: .78rem; font-family: var(--font-ui); }
.badge   {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: 20px;
  font-size: .72rem;
  font-family: var(--font-ui);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .6px;
}
.badge--accent  { background: color-mix(in srgb,var(--accent) 14%,transparent); color: var(--accent); }
.badge--accent2 { background: color-mix(in srgb,var(--accent2) 18%,transparent); color: var(--accent2); }
.badge--good    { background: color-mix(in srgb,var(--good) 14%,transparent); color: var(--good); }
.badge--bad     { background: color-mix(in srgb,var(--bad) 14%,transparent); color: var(--bad); }
.badge--muted   { background: color-mix(in srgb,var(--muted) 12%,transparent); color: var(--muted); }

.qtag {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent2);
  margin-bottom: 6px;
}

/* ── Botones ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 13px 20px;
  border-radius: var(--radius-md);
  border: none;
  font-family: var(--font-serif);
  font-size: .97rem;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
  min-height: 48px;
  touch-action: manipulation;
  user-select: none;
}
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .38; cursor: default; pointer-events: none; }

.btn--primary {
  width: 100%;
  background: var(--accent);
  color: #fff;
  margin-top: 14px;
  font-size: 1rem;
  box-shadow: 0 2px 8px color-mix(in srgb,var(--accent) 40%,transparent);
}
.btn--primary:hover { opacity: .92; }

.btn--ghost {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
}
.btn--ghost:hover { background: color-mix(in srgb,var(--ink) 5%,transparent); }

.btn--danger {
  background: color-mix(in srgb,var(--bad) 12%,transparent);
  color: var(--bad);
  border: 1px solid color-mix(in srgb,var(--bad) 25%,transparent);
}
.btn--sm { padding: 8px 14px; min-height: 36px; font-size: .88rem; border-radius: var(--radius-sm); }
.btn--icon { width: 40px; height: 40px; padding: 0; border-radius: var(--radius-sm); }

/* ── Inputs ───────────────────────────────────────────────── */
.input-wrap { margin-bottom: 16px; }
.input {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: 1rem;
  font-family: var(--font-serif);
  transition: border-color var(--transition), box-shadow var(--transition);
  min-height: 48px;
}
.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb,var(--accent) 15%,transparent);
}
.input::placeholder { color: var(--muted); opacity: .7; }
.input--error { border-color: var(--bad); }

textarea.input { resize: vertical; min-height: 80px; }
select.input   { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b5c47' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; }

.form-error {
  color: var(--bad);
  font-size: .82rem;
  font-family: var(--font-ui);
  margin-top: 5px;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Checkbox con estilo */
.checkbox-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: .9rem;
  user-select: none;
}
.checkbox-wrap input[type="checkbox"] {
  width: 18px; height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

/* ── PANTALLA: Login ─────────────────────────────────────── */
#screen-login {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 24px 16px;
  gap: 0;
}
#screen-login.active { display: flex; }

.login-logo {
  text-align: center;
  margin-bottom: 32px;
}
.login-logo__icon {
  font-size: 3.2rem;
  display: block;
  margin-bottom: 8px;
  line-height: 1;
}
.login-logo__title {
  font-size: 1.6rem;
  color: var(--ink);
  letter-spacing: .5px;
}
.login-logo__sub {
  color: var(--muted);
  font-size: .9rem;
  margin-top: 2px;
}

.login-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 28px 24px 24px;
  box-shadow: var(--shadow-md);
}

/* ── PANTALLA: Home (alumno) ─────────────────────────────── */
.home-header {
  padding: 20px 16px 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.home-header__greeting { font-size: 1.3rem; }
.home-header__greeting span { color: var(--accent); }
.home-header__meta { color: var(--muted); font-size: .82rem; font-family: var(--font-ui); }
.home-header__actions { display: flex; gap: 8px; }

.play-card {
  margin: 0 16px 12px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.play-card__body {
  position: relative;
  overflow: hidden;
  padding: 26px 22px 22px;
  color: #fff;
}
.play-card__bg-icon {
  position: absolute;
  right: -20px; bottom: -20px;
  width: 150px; height: 150px;
  opacity: .18;
  color: #fff;
  pointer-events: none;
}
.play-card__label {
  position: relative;
  z-index: 1;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  opacity: .85;
  font-family: var(--font-ui);
  font-weight: 600;
}
.play-card__course {
  position: relative;
  z-index: 1;
  font-size: 1.35rem;
  margin: 4px 0 14px;
}
.play-btn {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  background: rgba(255,255,255,.95);
  color: var(--ink);
  border: none;
  border-radius: 30px;
  font-family: var(--font-serif);
  font-size: .97rem;
  cursor: pointer;
  transition: transform var(--transition), opacity var(--transition);
  touch-action: manipulation;
  min-height: 44px;
  font-weight: normal;
}
.play-btn:hover { opacity: .92; }
.play-btn:active { transform: scale(.96); }
.play-btn:disabled { opacity: .55; cursor: default; }
.play-btn__plays {
  display: block;
  position: relative;
  z-index: 1;
  margin-top: 12px;
  font-size: .8rem;
  opacity: .82;
  font-family: var(--font-ui);
}

/* Rejilla de estadísticas */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 10px;
  padding: 0 16px 4px;
}
.stat-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 14px 12px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.stat-card__value {
  font-size: 1.7rem;
  color: var(--accent);
  line-height: 1.1;
}
.stat-card__label {
  font-size: .7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .6px;
  font-family: var(--font-ui);
  margin-top: 2px;
}

/* ── PANTALLA: Quiz ───────────────────────────────────────── */
.quiz-header {
  padding: 16px 16px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}
.quiz-progress-bar {
  height: 4px;
  background: var(--line);
  border-radius: 2px;
  margin: 0 16px 14px;
  overflow: hidden;
}
.quiz-progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent2) 100%);
  border-radius: 2px;
  transition: width 300ms ease;
}

.quiz-card {
  margin: 0 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.quiz-card__body { padding: 20px; }
.quiz-question {
  font-size: 1.12rem;
  line-height: 1.55;
  margin-bottom: 22px;
  color: var(--ink);
}

/* Opciones de respuesta */
.options { display: flex; flex-direction: column; gap: 10px; }
.option-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: .97rem;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), transform 150ms ease;
  min-height: 52px;
  line-height: 1.4;
  touch-action: manipulation;
}
.option-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: color-mix(in srgb,var(--accent) 5%,transparent);
  transform: translateX(2px);
}
.option-btn:active:not(:disabled) { transform: scale(.99); }
.option-btn:disabled { cursor: default; }
.option-btn.correct {
  border-color: var(--good);
  background: color-mix(in srgb,var(--good) 13%,transparent);
  color: var(--good);
}
.option-btn.wrong {
  border-color: var(--bad);
  background: color-mix(in srgb,var(--bad) 13%,transparent);
  color: var(--bad);
}

/* Indicador de acierto/fallo */
@keyframes bounce {
  0%,100% { transform: scale(1); }
  50%      { transform: scale(1.04); }
}
.option-btn.correct { animation: bounce .35s ease; }

/* ── PANTALLA: Resultado ──────────────────────────────────── */
.result-card {
  margin: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  text-align: center;
}
.result-card__body { padding: 24px 20px; }
.result-score { font-size: 3rem; color: var(--accent); line-height: 1; margin: 8px 0 4px; }
.result-max   { font-size: 1rem; color: var(--muted); }
.result-msg   { margin: 12px 0 20px; font-size: 1rem; }

/* Desglose de preguntas */
.answer-review { margin-top: 18px; text-align: left; }
.answer-item {
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 10px;
  align-items: flex-start;
}
.answer-item:last-child { border-bottom: none; }
.answer-icon { margin-top: 2px; font-size: 1rem; }
.answer-question { font-size: .88rem; color: var(--muted); margin-bottom: 3px; }
.answer-chosen   { font-size: .9rem; }
.answer-chosen.correct { color: var(--good); }
.answer-chosen.wrong   { color: var(--bad); }
.answer-correct-was { font-size: .82rem; color: var(--muted); font-style: italic; }

/* ── PANTALLA: Ranking ────────────────────────────────────── */
.lb-header { padding: 20px 16px 12px; }
.filterbar {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.filterbar__btn {
  padding: 6px 13px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  min-height: 34px;
}
.filterbar__btn:hover { border-color: var(--accent); color: var(--accent); }
.filterbar__btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in srgb,var(--accent) 10%,transparent);
}

.lb-table {
  width: 100%;
  border-collapse: collapse;
}
.lb-table th {
  padding: 7px 12px;
  text-align: left;
  font-size: .72rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .6px;
  border-bottom: 2px solid var(--line);
  font-family: var(--font-ui);
}
.lb-table td {
  padding: 12px 12px;
  border-bottom: 1px solid var(--line);
  font-size: .93rem;
  vertical-align: middle;
}
.lb-table tr:last-child td { border-bottom: none; }
.lb-table tr.me td { background: color-mix(in srgb,var(--accent2) 10%,transparent); }

.lb-rank {
  width: 32px;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: .85rem;
  font-weight: 700;
}
.lb-rank.top-1 { color: #c9a227; }
.lb-rank.top-2 { color: #9aa4ac; }
.lb-rank.top-3 { color: #a87b5a; }
.lb-name  { font-weight: normal; }
.lb-pts   { text-align: right; font-family: var(--font-ui); font-weight: 700; color: var(--accent); }

/* ── PANTALLA: Perfil ─────────────────────────────────────── */
.profile-header {
  padding: 24px 16px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.avatar {
  width: 64px; height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: #fff;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
}
.profile-name  { font-size: 1.25rem; }
.profile-meta  { color: var(--muted); font-size: .85rem; font-family: var(--font-ui); }

/* Racha */
.streak-display {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px;
  background: color-mix(in srgb,var(--accent2) 10%,transparent);
  border-radius: var(--radius-md);
  margin: 0 16px 12px;
  border: 1px solid color-mix(in srgb,var(--accent2) 25%,transparent);
}
.streak-number { font-size: 2rem; color: var(--accent2); line-height: 1; }
.streak-label  { font-size: .82rem; color: var(--muted); font-family: var(--font-ui); }

/* Historial de partidas */
.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.history-item:last-child { border-bottom: none; }
.history-course { font-size: .82rem; color: var(--muted); font-family: var(--font-ui); margin-bottom: 2px; }
.history-score  { font-size: 1.05rem; }
.history-date   { font-size: .78rem; color: var(--muted); font-family: var(--font-ui); }

/* ── PANEL DE PROFESOR ────────────────────────────────────── */
#app.teacher-mode { max-width: 960px; }

/* Navegación del profesor */
.teacher-nav {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 16px;
  position: sticky;
  top: var(--sat);
  z-index: 100;
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
  scrollbar-width: none;
}
.teacher-nav::-webkit-scrollbar { display: none; }
.teacher-nav__brand {
  font-size: .95rem;
  color: var(--accent);
  white-space: nowrap;
  padding: 14px 12px 14px 0;
  border-right: 1px solid var(--line);
  margin-right: 6px;
  font-weight: normal;
}
.teacher-nav__tab {
  padding: 14px 14px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
  min-height: 48px;
}
.teacher-nav__tab:hover { color: var(--ink); }
.teacher-nav__tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.teacher-content { padding: 20px 16px; }

/* Tarjetas de estadísticas del profesor */
.teacher-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}
.teacher-stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}
.teacher-stat__value { font-size: 2rem; color: var(--accent); line-height: 1; margin-bottom: 4px; }
.teacher-stat__label { font-size: .75rem; color: var(--muted); font-family: var(--font-ui); text-transform: uppercase; letter-spacing: .6px; }

/* Tablas de datos */
.data-table-wrap {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
}
.data-table th {
  padding: 11px 14px;
  text-align: left;
  font-size: .72rem;
  color: var(--muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .7px;
  background: color-mix(in srgb,var(--muted) 5%,transparent);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-ui);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}
.data-table th:hover { color: var(--ink); }
.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  font-size: .9rem;
  vertical-align: middle;
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: color-mix(in srgb,var(--ink) 3%,transparent); }
.data-table tr { cursor: pointer; }

/* Barra de herramientas */
.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.search-input {
  flex: 1;
  min-width: 200px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  font-size: .9rem;
  font-family: var(--font-ui);
  min-height: 40px;
}
.search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb,var(--accent) 12%,transparent);
}

/* Modal (editor de preguntas, añadir alumno) */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 200;
  padding: var(--sat) 0 var(--sab);
  animation: fadeIn 200ms ease both;
}
@media (min-width: 540px) {
  .modal-overlay { align-items: center; padding: 24px; }
}
@keyframes fadeIn { from { opacity: 0; } }

.modal {
  background: var(--panel);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  width: 100%;
  max-width: 520px;
  max-height: 90dvh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalUp 250ms cubic-bezier(.34,1.56,.64,1) both;
}
@media (min-width: 540px) {
  .modal { border-radius: var(--radius-xl); }
}
@keyframes modalUp {
  from { opacity: 0; transform: translateY(40px); }
}

.modal__header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal__title { font-size: 1.1rem; }
.modal__close {
  width: 36px; height: 36px;
  border: none;
  background: color-mix(in srgb,var(--muted) 12%,transparent);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.modal__close:hover { background: color-mix(in srgb,var(--muted) 20%,transparent); }
.modal__body { padding: 20px; }
.modal__footer {
  padding: 14px 20px 20px;
  border-top: 1px solid var(--line);
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* Toggle switch */
.toggle-wrap { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; }
.toggle-label { font-size: .93rem; }
.toggle-desc  { color: var(--muted); font-size: .8rem; font-family: var(--font-ui); }
.toggle {
  position: relative;
  width: 46px;
  height: 26px;
  flex-shrink: 0;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle__track {
  position: absolute;
  inset: 0;
  border-radius: 13px;
  background: var(--line);
  transition: background var(--transition);
  cursor: pointer;
}
.toggle__track::after {
  content: '';
  position: absolute;
  left: 3px; top: 3px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #fff;
  transition: transform var(--transition);
  box-shadow: 0 1px 3px rgba(0,0,0,.25);
}
.toggle input:checked + .toggle__track { background: var(--accent); }
.toggle input:checked + .toggle__track::after { transform: translateX(20px); }

/* Selector de opciones (para editor de preguntas) */
.option-editor {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
  align-items: center;
}
.option-editor__letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  font-family: var(--font-ui);
  font-weight: 700;
  flex-shrink: 0;
  color: var(--muted);
  transition: background var(--transition), color var(--transition);
}
.option-editor__letter.correct { background: var(--good); color: #fff; }
.option-editor__radio { display: none; }

/* ── Notificaciones Toast ─────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: calc(var(--sab) + 16px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  width: min(calc(100% - 32px), 400px);
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  background: var(--ink);
  color: var(--bg);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: .9rem;
  font-family: var(--font-ui);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: toastIn 300ms cubic-bezier(.34,1.56,.64,1) both;
}
.toast.out { animation: toastOut 250ms ease both; }
.toast--success { background: var(--good); color: #fff; }
.toast--error   { background: var(--bad);  color: #fff; }
.toast--info    { background: var(--accent); color: #fff; }

@keyframes toastIn  { from { opacity: 0; transform: translateY(20px) scale(.9); } }
@keyframes toastOut { to   { opacity: 0; transform: translateY(20px) scale(.9); } }

/* ── Overlay de carga ─────────────────────────────────────── */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 500;
  transition: opacity 300ms ease;
}
.loading-overlay.hidden { opacity: 0; pointer-events: none; }
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { color: var(--muted); font-size: .88rem; font-family: var(--font-ui); }

/* Skeleton loader */
.skeleton {
  background: linear-gradient(90deg, var(--line) 25%, color-mix(in srgb,var(--line) 60%,var(--panel)) 50%, var(--line) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { to { background-position: -200% center; } }

/* ── Sección vacía ────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--muted);
}
.empty-state__icon { font-size: 2.5rem; margin-bottom: 12px; }
.empty-state__title { font-size: 1rem; color: var(--ink); margin-bottom: 6px; }
.empty-state__body  { font-size: .88rem; font-family: var(--font-ui); }

/* ── Nivel seleccionado (grid de niveles) ─────────────────── */
.level-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}
.level-btn {
  position: relative;
  overflow: hidden;
  padding: 16px 12px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  color: #fff;
  font-family: var(--font-serif);
  font-size: .93rem;
  cursor: pointer;
  text-align: left;
  min-height: 72px;
  transition: border-color var(--transition), transform var(--transition);
}
.level-btn:active { transform: scale(.97); }
.level-btn.selected { border-color: rgba(255,255,255,.7); }
.level-btn__name  { position: relative; z-index: 1; display: block; }
.level-btn__tag   { position: relative; z-index: 1; display: block; font-size: .72rem; opacity: .82; margin-top: 2px; font-family: var(--font-ui); }
.level-btn__icon  { position: absolute; right: -10px; bottom: -12px; width: 60px; height: 60px; opacity: .25; color: #fff; }

/* ── Notificaciones (pantalla de perfil) ─────────────────── */
.notif-banner {
  background: color-mix(in srgb,var(--accent2) 10%,transparent);
  border: 1px solid color-mix(in srgb,var(--accent2) 25%,transparent);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin: 0 16px 12px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.notif-banner__icon { font-size: 1.6rem; flex-shrink: 0; }
.notif-banner__title { font-size: .92rem; margin-bottom: 2px; }
.notif-banner__body  { font-size: .8rem; color: var(--muted); font-family: var(--font-ui); }

/* Instrucción de instalación (iOS) */
.ios-install-tip {
  background: color-mix(in srgb,var(--muted) 8%,transparent);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: .85rem;
  font-family: var(--font-ui);
  line-height: 1.5;
  color: var(--muted);
  margin: 0 16px 12px;
}

/* ── Separadores y utilidades layout ─────────────────────── */
.section-title {
  padding: 18px 16px 10px;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  font-family: var(--font-ui);
  font-weight: 700;
}
.divider { height: 1px; background: var(--line); margin: 4px 0; }
.px-16 { padding-left: 16px; padding-right: 16px; }
.mt-sm { margin-top: 8px; }
.mt-md { margin-top: 16px; }
.text-right  { text-align: right; }
.text-center { text-align: center; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-sm { gap: 8px; }
.gap-md { gap: 14px; }
.fw-bold { font-weight: 700; font-family: var(--font-ui); }
.color-good { color: var(--good); }
.color-bad  { color: var(--bad);  }
.color-accent  { color: var(--accent); }
.color-accent2 { color: var(--accent2); }

/* Botón con círculo de logout */
.logout-btn {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: .8rem;
  font-family: var(--font-ui);
  cursor: pointer;
  transition: all var(--transition);
  min-height: 34px;
}
.logout-btn:hover { border-color: var(--bad); color: var(--bad); }

/* ── Responsive: escritorio ───────────────────────────────── */
@media (min-width: 640px) {
  .stats-grid { grid-template-columns: repeat(3,1fr); }
  .quiz-card  { margin: 0 24px; }
  .hero-card  { margin: 16px 24px 14px; }
  .play-card  { margin: 0 24px 12px; }
}

@media (min-width: 960px) {
  #app.teacher-mode {
    display: grid;
    grid-template-columns: 220px 1fr;
    align-items: flex-start;
    gap: 0;
  }
  .teacher-nav {
    flex-direction: column;
    align-items: flex-start;
    position: sticky;
    top: var(--sat);
    height: calc(100dvh - var(--sat));
    border-bottom: none;
    border-right: 1px solid var(--line);
    padding: 20px 12px;
    gap: 2px;
  }
  .teacher-nav__brand {
    padding: 0 8px 16px;
    border-right: none;
    border-bottom: 1px solid var(--line);
    margin-right: 0;
    margin-bottom: 8px;
    width: 100%;
  }
  .teacher-nav__tab {
    width: 100%;
    text-align: left;
    padding: 10px 12px;
    border-bottom: none;
    border-radius: var(--radius-sm);
    border-left: 2px solid transparent;
  }
  .teacher-nav__tab.active {
    border-bottom-color: transparent;
    border-left-color: var(--accent);
    background: color-mix(in srgb,var(--accent) 8%,transparent);
  }
}