/* ========== TOKENS ========== */
:root {
  --bg: #FAF7F2;
  --bg-elevated: #FFFFFF;
  --ink: #2A2A33;
  --ink-soft: #6B6B78;
  --ink-faint: #A8A8B3;
  --line: #ECE7DD;
  --line-soft: #F4F0E8;

  --accent: #7C6FE0;        /* lavanda */
  --accent-soft: #E8E4FB;
  --mint: #8FD4B8;
  --mint-soft: #DCF3E8;
  --peach: #F5B89E;
  --peach-soft: #FBE3D6;
  --sun: #F5D871;
  --sun-soft: #FCF1C8;
  --rose: #E89AB0;
  --rose-soft: #F8DCE4;

  --danger: #E07070;
  --success: #6FB58A;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(42,42,51,0.04), 0 2px 8px rgba(42,42,51,0.04);
  --shadow: 0 4px 16px rgba(42,42,51,0.06), 0 2px 4px rgba(42,42,51,0.04);
  --shadow-lg: 0 12px 32px rgba(42,42,51,0.10);

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }

.hidden { display: none !important; }

/* ========== AUTH ========== */
.auth-body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(circle at 20% 10%, var(--accent-soft) 0%, transparent 50%),
    radial-gradient(circle at 80% 90%, var(--peach-soft) 0%, transparent 50%),
    var(--bg);
}

.auth-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}

.auth-mark {
  font-size: 32px;
  color: var(--accent);
  text-align: center;
  margin-bottom: 8px;
}

.auth-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 600;
  text-align: center;
  letter-spacing: -0.02em;
}

.auth-sub {
  text-align: center;
  color: var(--ink-soft);
  margin: 8px 0 28px;
  font-size: 14px;
}

.tabs {
  display: flex;
  background: var(--line-soft);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 24px;
}

.tab {
  flex: 1;
  padding: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
  border-radius: 10px;
  transition: all 0.2s;
}

.tab.active {
  background: var(--bg-elevated);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}

.auth-form { display: flex; flex-direction: column; gap: 14px; }

.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
}

.auth-form input,
.form-input {
  padding: 12px 14px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  font-size: 15px;
  color: var(--ink);
  transition: border-color 0.2s, background 0.2s;
}

.auth-form input:focus,
.form-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--bg-elevated);
}

.btn-primary {
  padding: 13px;
  background: var(--accent);
  color: white;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 15px;
  margin-top: 4px;
  transition: transform 0.1s, background 0.2s;
}

.btn-primary:hover { background: #6A5DD0; }
.btn-primary:active { transform: scale(0.98); }

.btn-secondary {
  padding: 11px 18px;
  background: var(--line-soft);
  color: var(--ink);
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 14px;
  transition: background 0.2s;
}

.btn-secondary:hover { background: var(--line); }

.btn-ghost {
  padding: 8px 14px;
  font-size: 14px;
  color: var(--ink-soft);
  border-radius: 10px;
}

.btn-ghost:hover { background: var(--line-soft); color: var(--ink); }

.btn-danger {
  padding: 10px 16px;
  background: transparent;
  color: var(--danger);
  border: 1.5px solid var(--danger);
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 14px;
}

.btn-danger:hover { background: var(--danger); color: white; }

.form-msg { font-size: 13px; min-height: 18px; }
.form-msg.error { color: var(--danger); }
.form-msg.success { color: var(--success); }

/* ========== APP HEADER ========== */
.app-body {
  padding-bottom: 60px;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 247, 242, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.app-brand {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  cursor: pointer;
}

.app-brand .mark { color: var(--accent); }

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.streak-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px 6px 10px;
  background: var(--peach-soft);
  color: #C95A2E;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
}

.streak-pill .flame { font-size: 16px; }

.xp-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--accent-soft);
  color: #5A4DBC;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
}

.user-menu {
  position: relative;
}

.user-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  font-weight: 600;
  font-size: 14px;
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-elevated);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 6px;
  min-width: 160px;
  display: none;
}

.user-dropdown.open { display: block; }

.user-dropdown button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
}

.user-dropdown button:hover { background: var(--line-soft); }

/* ========== APP MAIN ========== */
.app-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.page-sub {
  color: var(--ink-soft);
  margin-bottom: 28px;
  font-size: 15px;
}

/* ========== HOME ========== */
.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.home-tile {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: left;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 140px;
}

.home-tile:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.home-tile .tile-icon {
  font-size: 28px;
  margin-bottom: 6px;
}

.home-tile h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.home-tile p {
  font-size: 13px;
  color: var(--ink-soft);
}

.tile-accent { background: var(--accent-soft); }
.tile-mint { background: var(--mint-soft); }
.tile-peach { background: var(--peach-soft); }
.tile-sun { background: var(--sun-soft); }
.tile-rose { background: var(--rose-soft); }

.summary-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 22px 26px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}

.summary-stat {
  display: flex;
  flex-direction: column;
}

.summary-stat .num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  line-height: 1;
}

.summary-stat .label {
  font-size: 12px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 4px;
}

/* ========== PAGE NAV ========== */
.page-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 16px;
  padding: 6px 10px;
  border-radius: 8px;
}

.page-back:hover { background: var(--line-soft); color: var(--ink); }

/* ========== FOLDERS / TREE ========== */
.folder-toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  align-items: center;
}

.breadcrumbs {
  display: flex;
  gap: 6px;
  align-items: center;
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.breadcrumbs button {
  color: var(--accent);
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 6px;
}

.breadcrumbs button:hover { background: var(--accent-soft); }

.breadcrumbs .sep { color: var(--ink-faint); }

.folder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}

.folder-card {
  background: var(--bg-elevated);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
}

.folder-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.folder-card .folder-icon { font-size: 24px; }
.folder-card .folder-name { font-weight: 600; font-size: 15px; }
.folder-card .folder-meta { font-size: 12px; color: var(--ink-soft); }

.folder-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.2s;
}

.folder-card:hover .folder-actions { opacity: 1; }

.icon-btn {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--ink-soft);
}

.icon-btn:hover { background: var(--line); color: var(--ink); }

/* ========== FLASHCARDS GRID ========== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.flashcard {
  perspective: 1000px;
  cursor: pointer;
  position: relative;
  height: 180px;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
  transform-style: preserve-3d;
}

.flashcard.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 16px;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  word-break: break-word;
  overflow: hidden;
}

.flashcard-face.back {
  transform: rotateY(180deg);
  font-weight: 400;
}

.flashcard-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 4px;
  z-index: 2;
  opacity: 0;
  transition: opacity 0.2s;
}

.flashcard:hover .flashcard-actions { opacity: 1; }

.flashcard-actions .icon-btn {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(4px);
}

.card-stats {
  position: absolute;
  bottom: 8px;
  left: 8px;
  display: flex;
  gap: 8px;
  font-size: 11px;
  color: rgba(0,0,0,0.5);
  font-weight: 500;
}

/* Paleta de colores para flashcards */
.color-accent { background: var(--accent-soft); color: #4A3F9C; }
.color-mint { background: var(--mint-soft); color: #2F7E5C; }
.color-peach { background: var(--peach-soft); color: #B8552B; }
.color-sun { background: var(--sun-soft); color: #8C7423; }
.color-rose { background: var(--rose-soft); color: #A84867; }
.color-sky { background: #DAE9F7; color: #2E5A8E; }
.color-cream { background: #F4EFE4; color: #6B5C3E; }

/* ========== FORMS ========== */
.form-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  max-width: 600px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
}

.form-group textarea {
  padding: 12px 14px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  font-size: 15px;
  resize: vertical;
  min-height: 80px;
}

.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--bg-elevated);
}

.form-group select {
  padding: 12px 14px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  font-size: 15px;
}

.color-picker {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.color-swatch {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  cursor: pointer;
  border: 3px solid transparent;
  transition: transform 0.15s, border-color 0.2s;
}

.color-swatch:hover { transform: scale(1.08); }
.color-swatch.selected { border-color: var(--ink); }

.form-actions {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

/* ========== GAMES ========== */
.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.game-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  overflow: hidden;
}

.game-card .game-icon {
  font-size: 36px;
  margin-bottom: 6px;
}

.game-card h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
}

.game-card p {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.game-card.locked {
  opacity: 0.6;
}

.game-card .lock-info {
  font-size: 12px;
  color: var(--ink-faint);
  font-style: italic;
}

/* ========== GAME PLAY ========== */
.game-play {
  max-width: 720px;
  margin: 0 auto;
}

.game-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--ink-soft);
}

.game-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--line);
  border-radius: 3px;
  margin: 0 16px;
  overflow: hidden;
}

.game-progress-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.3s;
}

.game-card-big {
  perspective: 1000px;
  height: 320px;
  margin-bottom: 24px;
  cursor: pointer;
}

.game-card-big .flashcard-inner { width: 100%; height: 100%; position: relative; transition: transform 0.6s; transform-style: preserve-3d;}
.game-card-big.flipped .flashcard-inner { transform: rotateY(180deg); }
.game-card-big .flashcard-face {
  font-size: 22px;
  padding: 40px;
  border-radius: var(--radius-lg);
}

.game-controls {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 12px;
  flex-wrap: wrap;
}

.btn-correct {
  padding: 13px 24px;
  background: var(--mint-soft);
  color: #2F7E5C;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 15px;
  border: 1.5px solid transparent;
  transition: all 0.2s;
}

.btn-correct:hover { background: var(--mint); color: white; }

.btn-wrong {
  padding: 13px 24px;
  background: var(--rose-soft);
  color: #A84867;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 15px;
  border: 1.5px solid transparent;
  transition: all 0.2s;
}

.btn-wrong:hover { background: var(--rose); color: white; }

.test-options {
  display: grid;
  gap: 10px;
}

.test-option {
  padding: 16px 20px;
  background: var(--bg-elevated);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  text-align: left;
  font-size: 15px;
  transition: all 0.2s;
}

.test-option:hover { border-color: var(--accent); background: var(--accent-soft); }
.test-option.correct { background: var(--mint-soft); border-color: var(--mint); color: #2F7E5C; }
.test-option.wrong { background: var(--rose-soft); border-color: var(--rose); color: #A84867; }
.test-option:disabled { cursor: default; }

.game-result {
  text-align: center;
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow);
}

.game-result .result-icon {
  font-size: 56px;
  margin-bottom: 12px;
}

.game-result h2 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 8px;
}

.result-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin: 24px 0;
  flex-wrap: wrap;
}

.result-stat .num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 600;
  color: var(--accent);
}

.result-stat .label {
  font-size: 12px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-comparison {
  background: var(--line-soft);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.result-comparison .better { color: var(--success); font-weight: 600; }
.result-comparison .worse { color: var(--danger); font-weight: 600; }

/* ========== SELECTOR DE CARPETAS PARA JUEGO ========== */
.folder-select-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 18px 0;
  max-height: 320px;
  overflow-y: auto;
  padding: 6px;
}

.folder-select-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s;
}

.folder-select-item:hover { background: var(--line-soft); }

.folder-select-item input { width: 18px; height: 18px; accent-color: var(--accent); }
.folder-select-item .label-text { flex: 1; font-size: 14px; }
.folder-select-item .count { font-size: 12px; color: var(--ink-soft); }

/* ========== STATS ========== */
.progress-tabs {
  max-width: 400px;
  margin-bottom: 28px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--bg-elevated);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.stat-card .stat-label {
  font-size: 12px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.stat-card .stat-value {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 600;
  line-height: 1;
}

.stat-card .stat-sub {
  font-size: 12px;
  color: var(--ink-faint);
  margin-top: 6px;
}

.heatmap-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.heatmap-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
}

.heatmap {
  display: grid;
  grid-auto-flow: column;
  grid-template-rows: repeat(7, 14px);
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.heatmap-cell {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  background: var(--line-soft);
}

.heatmap-cell.level-1 { background: var(--accent-soft); }
.heatmap-cell.level-2 { background: #C9C0F0; }
.heatmap-cell.level-3 { background: #9D8FE8; }
.heatmap-cell.level-4 { background: var(--accent); }

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: flex-end;
  font-size: 12px;
  color: var(--ink-soft);
  margin-top: 10px;
}

/* ========== ACHIEVEMENTS ========== */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px;
}

.achievement {
  background: var(--bg-elevated);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s;
}

.achievement.locked {
  opacity: 0.45;
  filter: grayscale(0.5);
}

.achievement .ach-icon {
  font-size: 36px;
  margin-bottom: 8px;
}

.achievement .ach-name {
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 4px;
}

.achievement .ach-desc {
  font-size: 12px;
  color: var(--ink-soft);
}

/* ========== MODAL ========== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(42,42,51,0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

.modal {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 28px;
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal h2 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 8px;
}

.modal p { color: var(--ink-soft); margin-bottom: 16px; font-size: 14px; }

/* ========== TOAST ========== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--ink);
  color: white;
  padding: 14px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.show { transform: translateX(-50%) translateY(0); }
.toast.achievement { background: var(--accent); }

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--ink-soft);
}

.empty-state .empty-icon { font-size: 48px; margin-bottom: 12px; opacity: 0.5; }
.empty-state p { font-size: 15px; margin-bottom: 14px; }

/* ========== RESPONSIVE ========== */
@media (max-width: 640px) {
  .app-header { padding: 12px 16px; gap: 8px; flex-wrap: wrap; }
  .app-main { padding: 20px 16px; }
  .auth-card { padding: 28px 22px; }
  .summary-card { padding: 18px; gap: 16px; }
  .summary-stat .num { font-size: 22px; }
  .home-tile { padding: 20px; min-height: 120px; }
  .game-card-big { height: 260px; }
  .game-card-big .flashcard-face { font-size: 18px; padding: 24px; }
  .result-stats { gap: 20px; }
  .streak-pill, .xp-pill { font-size: 13px; padding: 5px 10px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visibles */
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}