:root {
  --bg: #14161c;
  --bg-panel: #1b1e26;
  --bg-panel-2: #21252f;
  --border: #2e323d;
  --text: #edeff3;
  --text-muted: #9aa0ac;
  --accent: #c99a54;
  --accent-strong: #e0b578;
  --success: #4caf7d;
  --danger: #d9695a;
  --info: #8f8bc4;
  --radius: 8px;
  --radius-sm: 6px;
  --on-accent: #191307;
  --font-head: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }

/* El atributo `hidden` debe ganar siempre a cualquier `display` con más
   especificidad (ids, clases) declarado más abajo en esta hoja de estilos;
   si no, elementos como los modales o las tarjetas de feedback/resultado
   quedarían visibles aunque JS les ponga `hidden`. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  min-height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  padding-bottom: env(safe-area-inset-bottom, 0);
  touch-action: manipulation;
}

a { color: var(--accent-strong); }

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

/* ---------- Header ---------- */
.site-header {
  text-align: center;
  padding: calc(env(safe-area-inset-top, 0) + 20px) 16px 8px;
  border-bottom: 1px solid var(--border);
}
.site-header h1 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1.35rem, 5.6vw, 1.9rem);
  margin: 0 0 4px;
  letter-spacing: 0.005em;
}
.site-header h1 .accent { color: var(--accent-strong); font-style: italic; }
.tagline {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.86rem;
  letter-spacing: 0.01em;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 14px 14px 24px;
  max-width: 640px;
  width: 100%;
  margin: 0 auto;
}

/* ---------- Cómo funciona ---------- */
.howto h2 { font-family: var(--font-head); font-weight: 600; font-size: 1.05rem; margin: 0 0 6px; }
.howto summary {
  cursor: pointer;
  color: var(--accent-strong);
  font-weight: 600;
  padding: 8px 0;
  touch-action: manipulation;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.howto p, .howto li { font-size: 0.88rem; line-height: 1.55; color: var(--text-muted); }
.howto ul { margin: 8px 0 0; padding-left: 1.2em; }
.howto strong { color: var(--text); font-weight: 600; }

/* ---------- Game area ---------- */
.game-area {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

#game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
#set-number {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}

#progress-dots { display: flex; gap: 6px; }
.progress-dot {
  width: 18px; height: 6px;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: transparent;
  flex-shrink: 0;
}
.progress-dot.answered-wrong { background: var(--danger); border-color: var(--danger); }
.progress-dot.answered-correct { background: var(--success); border-color: var(--success); }
.progress-dot.current { border-color: var(--accent-strong); }

/* ---------- Header actions ---------- */
#header-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.icon-btn {
  min-height: 44px;
  min-width: 44px;
  padding: 6px 10px;
  font-size: 1.02rem;
  line-height: 1;
  border-radius: var(--radius-sm);
}
.icon-btn[aria-pressed="true"] { border-color: var(--accent); background: var(--bg-panel-2); }

/* ---------- Practice banner ---------- */
#practice-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 0.85rem;
}
#practice-banner button { padding: 10px; min-height: 44px; font-size: 0.82rem; }

/* ---------- Question card ---------- */
.item-type-label {
  display: block;
  font-size: 0.74rem;
  color: var(--accent-strong);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  margin: 0 0 12px;
}
.sentence {
  font-size: 1.12rem;
  line-height: 1.6;
  margin: 0 0 16px;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
@media (min-width: 480px) {
  .options-grid { grid-template-columns: 1fr 1fr; }
}
.option-btn {
  min-height: 48px;
  padding: 12px 14px;
  text-align: left;
  font-size: 0.95rem;
  font-weight: 500;
  font-family: var(--font-body);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-panel-2);
  color: var(--text);
  cursor: pointer;
  touch-action: manipulation;
  transition: background 0.15s, border-color 0.15s;
}
.option-btn:active { background: var(--bg-panel); }
.option-btn:disabled { cursor: default; }
.option-btn.correct { background: var(--success); border-color: var(--success); color: #06281c; }
.option-btn.incorrect { background: var(--danger); border-color: var(--danger); color: #2a0a0a; }

/* ---------- Feedback card ---------- */
.feedback-card {
  display: flex;
  flex-direction: column;
  gap: 7px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
  margin-top: 14px;
}
.feedback-icon { font-size: 1.5rem; margin: 0; }
#feedback-target {
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--accent-strong);
  margin: 0;
  font-size: 1.3rem;
}
.feedback-card p { margin: 0; font-size: 0.9rem; line-height: 1.55; color: var(--text-muted); }
.feedback-example {
  color: var(--text);
  font-style: italic;
  background: var(--bg-panel-2);
  border-left: 2px solid var(--accent);
  padding: 9px 11px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
#feedback-separable, #feedback-synonym { color: var(--info); }
.feedback-card button {
  align-self: flex-start;
  margin-top: 8px;
}

/* ---------- Result card ---------- */
.result-card { display: flex; flex-direction: column; gap: 10px; }
#result-title { font-family: var(--font-head); font-weight: 600; font-size: 1.25rem; margin: 0; color: var(--text); }
#result-score { margin: 0; font-size: 1rem; font-weight: 600; color: var(--accent-strong); }
.result-squares { display: flex; gap: 6px; font-size: 1.4rem; }
#share-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
#share-feedback { font-size: 0.82rem; color: var(--success); }
#next-day-countdown { font-size: 0.85rem; color: var(--text-muted); }

/* ---------- FAQ ---------- */
.faq h2 { font-family: var(--font-head); font-weight: 600; font-size: 1.05rem; margin: 0 0 12px; }
.faq-item { margin-bottom: 14px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.faq-item:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }
.faq-item h3 { font-size: 0.94rem; margin: 0 0 4px; color: var(--text); font-weight: 600; }
.faq-item p { font-size: 0.86rem; line-height: 1.55; color: var(--text-muted); margin: 0; }

/* ---------- Modals ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 12, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
  overflow-y: auto;
}
.modal {
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.modal h2 {
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--text);
  margin: 0;
  font-size: 1.15rem;
}
.modal h3 { font-family: var(--font-head); font-weight: 600; font-size: 0.98rem; margin: 4px 0 0; }
.modal p, .modal li { font-size: 0.88rem; line-height: 1.5; color: var(--text-muted); }
.modal ul { margin: 0; padding-left: 1.2em; }
.modal strong { color: var(--text); font-weight: 600; }
.modal > button { align-self: flex-start; }
.stats-note { font-size: 0.78rem; font-style: italic; }

.stats-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.stat-tile {
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  text-align: center;
}
.stat-num {
  display: block;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.35rem;
  color: var(--accent-strong);
}
.stat-label { font-size: 0.74rem; color: var(--text-muted); }

.stats-distribution { display: flex; flex-direction: column; gap: 6px; }
.dist-row { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; }
.dist-label { width: 2.4em; flex-shrink: 0; color: var(--text-muted); }
.dist-bar-track {
  flex: 1;
  background: var(--bg-panel-2);
  border-radius: 4px;
  overflow: hidden;
  height: 16px;
}
.dist-bar-fill {
  height: 100%;
  min-width: 2px;
  background: var(--accent);
}
.dist-count { width: 1.6em; text-align: right; flex-shrink: 0; }

#archive-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 48vh;
  overflow-y: auto;
}
.archive-item {
  text-align: left;
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  min-height: unset;
  display: block;
  width: 100%;
}
.archive-item h3 { margin: 0 0 3px; font-family: var(--font-head); font-weight: 600; font-size: 0.92rem; color: var(--accent-strong); }
.archive-item p.archive-teaser { margin: 0; font-size: 0.78rem; color: var(--text-muted); }

button {
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  padding: 12px 14px;
  min-height: 44px;
  cursor: pointer;
  touch-action: manipulation;
  background: var(--bg-panel-2);
  color: var(--text);
  transition: background 0.15s, opacity 0.15s;
}
button:active { opacity: 0.85; }
button:disabled { opacity: 0.5; cursor: default; }

#btn-next, #btn-welcome-close {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
  width: 100%;
}
#btn-share {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}

/* ---------- Footer ---------- */
.site-footer {
  text-align: center;
  padding: 14px 16px calc(env(safe-area-inset-bottom, 0) + 16px);
  color: var(--text-muted);
  font-size: 0.76rem;
  max-width: 640px;
  margin: 0 auto;
  border-top: 1px solid var(--border);
}
.site-footer p { margin: 4px 0; }

/* ---------- Responsive tweaks ---------- */
@media (max-width: 340px) {
  .site-header h1 { font-size: 1.2rem; }
  button { font-size: 0.85rem; padding: 10px 8px; }
  .sentence { font-size: 1rem; }
}

/* ---------- Tema claro ---------- */
:root[data-theme="light"] {
  --bg: #faf7f2;
  --bg-panel: #ffffff;
  --bg-panel-2: #f3efe6;
  --border: #ddd5c4;
  --text: #1d1b16;
  --text-muted: #6c6558;
  --accent: #96651f;
  --accent-strong: #7a5119;
  --success: #2f8f5b;
  --danger: #b83f2e;
  --info: #6a63a8;
  --on-accent: #fbf7ee;
  color-scheme: light;
}
:root[data-theme="light"] .option-btn.correct { color: #052e16; }
:root[data-theme="light"] .option-btn.incorrect { color: #450a0a; }
:root[data-theme="light"] .modal-backdrop { background: rgba(29, 27, 22, 0.45); }