/* ═══════════════════════════════════════════════════════════
   Flashcard App — Main Stylesheet
   Extracted from inline <style> + light/dark theme support
   ═══════════════════════════════════════════════════════════ */

/* ─── Theme Variables ─────────────────────────────────────── */
:root {
  --radius: 16px;
  color-scheme: dark light;
}

/* Dark theme (default) */
[data-theme="dark"], :root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --card: #232736;
  --accent: #6c63ff;
  --accent-light: #8b83ff;
  --green: #4caf50;
  --orange: #ff9800;
  --red: #ef5350;
  --text: #e8e8ed;
  --text-dim: #8b8fa3;
  --border: #2d3145;
  --card-front-bg: linear-gradient(135deg, #232736, #2a2f45);
  --card-front-border: var(--border);
  --card-back-bg: linear-gradient(135deg, #1e2a1e, #243024);
  --card-back-border: #3a5a3a;
  --input-focus-bg: rgba(255,255,255,0.04);
  --hover-bg: rgba(255,255,255,0.05);
  --shadow-color: rgba(0,0,0,0.35);
  --overlay-bg: rgba(0,0,0,0.6);
  --levelup-bg: linear-gradient(135deg, #1a1d27, #2a2f45);
}

/* Light theme */
[data-theme="light"] {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --card: #ffffff;
  --accent: #5b52e0;
  --accent-light: #7b73ff;
  --green: #2e7d32;
  --orange: #e65100;
  --red: #c62828;
  --text: #1a1a2e;
  --text-dim: #6b7085;
  --border: #d8dae5;
  --card-front-bg: linear-gradient(135deg, #f8f9fc, #eef0f8);
  --card-front-border: var(--border);
  --card-back-bg: linear-gradient(135deg, #e8f5e9, #f1f8e9);
  --card-back-border: #a5d6a7;
  --input-focus-bg: rgba(0,0,0,0.03);
  --hover-bg: rgba(0,0,0,0.04);
  --shadow-color: rgba(0,0,0,0.1);
  --overlay-bg: rgba(0,0,0,0.4);
  --levelup-bg: linear-gradient(135deg, #f8f9fc, #eef0f8);
}

/* Auto-detect system preference when no explicit choice */
@media (prefers-color-scheme: light) {
  [data-theme="auto"] {
    --bg: #f5f5f7;
    --surface: #ffffff;
    --card: #ffffff;
    --accent: #5b52e0;
    --accent-light: #7b73ff;
    --green: #2e7d32;
    --orange: #e65100;
    --red: #c62828;
    --text: #1a1a2e;
    --text-dim: #6b7085;
    --border: #d8dae5;
    --card-front-bg: linear-gradient(135deg, #f8f9fc, #eef0f8);
    --card-front-border: var(--border);
    --card-back-bg: linear-gradient(135deg, #e8f5e9, #f1f8e9);
    --card-back-border: #a5d6a7;
    --input-focus-bg: rgba(0,0,0,0.03);
    --hover-bg: rgba(0,0,0,0.04);
    --shadow-color: rgba(0,0,0,0.1);
    --overlay-bg: rgba(0,0,0,0.4);
    --levelup-bg: linear-gradient(135deg, #f8f9fc, #eef0f8);
  }
}

/* ─── Reset & Base ────────────────────────────────────────── */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.3s, color 0.3s;
}

/* ─── Top Bar ─────────────────────────────────────────────── */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.topbar h1 { font-size: 1.3rem; font-weight: 700; }
.topbar h1 span { color: var(--accent); }
.topbar-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

/* ─── Gear Dropdown ───────────────────────────────────────── */
.gear-dropdown { position: relative; display: inline-block; }
.gear-dropdown-menu {
  display: none; position: absolute; right: 0; top: calc(100% + 4px);
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  min-width: 170px; z-index: 200; box-shadow: 0 8px 24px var(--shadow-color);
  overflow: hidden;
}
.gear-dropdown.open .gear-dropdown-menu { display: block; }
.gear-dropdown-item {
  padding: 10px 16px; font-size: 0.875rem; color: var(--text);
  cursor: pointer; display: flex; align-items: center; gap: 8px;
  transition: background 0.12s;
}
.gear-dropdown-item:hover { background: var(--hover-bg); }
.gear-dropdown-item .gear-icon-label { font-size: 0.8rem; }
.gear-dropdown-item.admin-item { color: var(--accent); }
.gear-dropdown-item.admin-item:hover { background: rgba(108,99,255,0.1); }

/* ─── Buttons ─────────────────────────────────────────────── */
/* Design system:
   btn-primary  → accent purple  (#6c63ff) — main actions
   btn-success  → green  (#4caf50) — positive confirmations
   btn-danger   → red    (#e53935) — destructive actions
   btn-secondary→ gray             — cancel / dismiss
   btn-ghost    → transparent      — secondary navigation
   btn-green / btn-red are aliases kept for back-compat  */
.btn {
  padding: 8px 16px; border: none; border-radius: 8px;
  font-size: 0.875rem; font-weight: 600; cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn:active { transform: scale(0.96); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-light); }
.btn-primary:active:not(:disabled) { background: var(--accent); }

.btn-success, .btn-green { background: #4caf50; color: #fff; }
.btn-success:hover:not(:disabled), .btn-green:hover:not(:disabled) { background: #43a047; }
.btn-success:active:not(:disabled), .btn-green:active:not(:disabled) { background: #388e3c; }

.btn-danger, .btn-red { background: #e53935; color: #fff; }
.btn-danger:hover:not(:disabled), .btn-red:hover:not(:disabled) { background: #c62828; }
.btn-danger:active:not(:disabled), .btn-red:active:not(:disabled) { background: #b71c1c; }

.btn-secondary { background: var(--surface); color: var(--text-dim); border: 1px solid var(--border); }
.btn-secondary:hover:not(:disabled) { color: var(--text); border-color: var(--text-dim); }
.btn-secondary:active:not(:disabled) { background: var(--hover-bg); }

.btn-orange { background: var(--orange); color: #fff; }
.btn-orange:hover:not(:disabled) { background: #f57c00; }

.btn-ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover:not(:disabled) { color: var(--text); border-color: var(--text-dim); }
.btn-ghost:active:not(:disabled) { background: var(--hover-bg); }

.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.btn-xs { padding: 4px 8px; font-size: 0.75rem; }

.undo-btn { font-size: 1.2rem; padding: 4px 10px; line-height: 1; background: #e53935; border-color: #e53935; color: #fff; }
.undo-btn:hover { background: #c62828; border-color: #c62828; color: #fff; }

/* ─── Tabs ────────────────────────────────────────────────── */
.tabs {
  display: flex; gap: 0; background: var(--surface);
  border-bottom: 1px solid var(--border); padding: 0 24px;
}
.tab {
  padding: 12px 20px; cursor: pointer; font-size: 0.9rem;
  color: var(--text-dim); border-bottom: 2px solid transparent;
  transition: all 0.15s; font-weight: 500;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ─── Panels ──────────────────────────────────────────────── */
.panel { display: none; padding: 24px; max-width: 900px; margin: 0 auto; }
.panel.active { display: block; }

/* ─── Stats Row ───────────────────────────────────────────── */
.stats { display: flex; gap: 12px; margin-bottom: 24px; flex-wrap: wrap; }
.stat-card {
  background: var(--card); border-radius: 12px; padding: 16px 20px;
  flex: 1; min-width: 120px;
}
.stat-card .label { font-size: 0.75rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.05em; }
.stat-card .value { font-size: 1.6rem; font-weight: 700; margin-top: 4px; }
.stat-card .value.green { color: var(--green); }
.stat-card .value.orange { color: var(--orange); }
.stat-card .value.accent { color: var(--accent); }

/* ─── Flashcard ───────────────────────────────────────────── */
.flashcard-area { display: flex; flex-direction: column; align-items: center; margin-top: 16px; }
.progress-text { font-size: 0.85rem; color: var(--text-dim); margin-bottom: 16px; }
.card-container { perspective: 1200px; width: 100%; max-width: 520px; height: 300px; cursor: pointer; margin-bottom: 24px; }
.card-inner { position: relative; width: 100%; height: 100%; transition: transform 0.5s ease-in-out; transform-style: preserve-3d; -webkit-transform-style: preserve-3d; }
.card-inner.flipped { transform: rotateY(180deg); }
.card-front, .card-back {
  position: absolute; width: 100%; height: 100%;
  backface-visibility: hidden; -webkit-backface-visibility: hidden; border-radius: var(--radius);
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; padding: 32px; text-align: center;
}
.card-front { background: var(--card-front-bg); border: 1px solid var(--card-front-border); }
.card-back { background: var(--card-back-bg); border: 1px solid var(--card-back-border); transform: rotateY(180deg); }
.card-lang { font-size: 0.75rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 12px; }
.card-word { font-size: 1.8rem; font-weight: 700; line-height: 1.3; }
.card-phonetics { margin-top: 6px; font-size: 0.85rem; color: var(--text-dim); line-height: 1.4; }
.card-phonetics .phonetics-simple { font-weight: 600; letter-spacing: 0.02em; }
.card-phonetics .phonetics-ipa { font-family: 'Segoe UI', 'Noto Sans', sans-serif; opacity: 0.75; }
.card-hint { font-size: 0.85rem; color: var(--text-dim); margin-top: 16px; }

/* ─── Edit Card Modal ─────────────────────────────────────── */
.edit-card-overlay {
  position: fixed; inset: 0; background: var(--overlay-bg);
  display: none; align-items: center; justify-content: center;
  z-index: 1000; padding: 20px; overflow-y: auto;
}
.edit-card-overlay.active { display: flex; }
.edit-card-modal { width: 100%; max-width: 520px; display: flex; flex-direction: column; gap: 16px; }
.edit-card-modal .card-front,
.edit-card-modal .card-back {
  position: static; transform: none; backface-visibility: visible;
  width: 100%; height: auto; min-height: 200px;
}
.edit-card-modal .card-word { width: 100%; }
.edit-card-modal .card-word textarea {
  width: 100%; background: transparent; border: none;
  color: var(--text); font-size: 1.8rem; font-weight: 700;
  text-align: center; resize: none; outline: none;
  font-family: inherit; line-height: 1.3; overflow: hidden; padding: 0;
}
.edit-card-modal .card-word textarea:focus { background: var(--input-focus-bg); border-radius: 8px; }
.edit-card-actions { display: flex; gap: 12px; justify-content: center; margin-top: 4px; }
.card-type-badge {
  position: absolute; top: 16px; right: 16px;
  font-size: 0.7rem; padding: 3px 8px; border-radius: 6px;
  background: rgba(108,99,255,0.2); color: var(--accent-light);
}
.card-counter {
  position: absolute; top: 16px; left: 16px;
  font-size: 0.7rem; padding: 3px 8px; border-radius: 6px;
  background: rgba(255,255,255,0.08); color: var(--text-dim);
}
.speak-btn {
  background: none; border: none; cursor: pointer;
  color: var(--text-dim); font-size: 1.8rem; padding: 8px;
  border-radius: 8px; transition: all 0.15s; margin-top: 8px;
}
.speak-btn:hover { color: var(--accent-light); background: rgba(108,99,255,0.1); }
.speak-btn.speaking { color: var(--accent); }
.rating-buttons { display: flex; gap: 12px; }
.rating-buttons .btn { min-width: 100px; justify-content: center; }

/* ─── Study Toolbar (mode picker + reverse toggle) ──────── */
.study-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; margin-bottom: 12px; flex-wrap: wrap;
}
.study-input-modes { display: flex; gap: 6px; }
.study-input-btn {
  padding: 6px 14px; font-size: 0.8rem; font-weight: 600;
  border: 1.5px solid var(--border); border-radius: 20px;
  background: none; color: var(--text-dim); cursor: pointer;
  transition: all 0.15s;
}
.study-input-btn:hover { color: var(--text); border-color: var(--text-dim); }
.study-input-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.study-reverse-btn {
  padding: 6px 14px; font-size: 0.8rem; font-weight: 600;
  border: 1.5px solid var(--border); border-radius: 20px;
  background: none; color: var(--text-dim); cursor: pointer;
  transition: all 0.15s; white-space: nowrap;
}
.study-reverse-btn:hover { color: var(--text); border-color: var(--text-dim); }
.study-reverse-btn.active { background: rgba(108,99,255,0.15); border-color: var(--accent); color: var(--accent-light); }

/* ─── Typing Mode ─────────────────────────────────────────── */
.typing-card {
  display: flex; flex-direction: column; align-items: center;
  width: 100%; max-width: 520px; gap: 12px;
}
.typing-progress { font-size: 0.85rem; color: var(--text-dim); align-self: flex-start; }
.typing-prompt-lang { font-size: 0.75rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.1em; }
.typing-prompt-word {
  font-size: 2rem; font-weight: 700; line-height: 1.3;
  text-align: center; color: var(--text);
  background: var(--card-front-bg); border: 1px solid var(--card-front-border);
  border-radius: var(--radius); padding: 28px 32px; width: 100%;
}
.typing-input-row { display: flex; gap: 8px; width: 100%; }
.typing-input {
  flex: 1; background: var(--input-bg); border: 1.5px solid var(--border);
  border-radius: 10px; padding: 12px 16px; font-size: 1.1rem;
  color: var(--text); font-family: inherit; outline: none;
  transition: border-color 0.15s;
}
.typing-input:focus { border-color: var(--accent); }
.typing-input:disabled { opacity: 0.7; }
.typing-result-area { width: 100%; text-align: center; min-height: 32px; }
.typing-correct { color: var(--green); font-weight: 700; font-size: 1.1rem; padding: 6px 0; }
.typing-incorrect { color: var(--red); font-weight: 700; font-size: 1.1rem; padding: 6px 0; }
.typing-correct-answer { font-size: 1rem; color: var(--text-dim); margin-top: 4px; }
.typing-correct-answer strong { color: var(--text); font-size: 1.1rem; }
.typing-rating-row {
  display: none; gap: 8px; flex-wrap: wrap;
  justify-content: center; align-items: center; width: 100%; margin-top: 4px;
}
.typing-rating-row .btn { min-width: 80px; justify-content: center; }

/* ─── Listening Mode ─────────────────────────────────────── */
.listening-card {
  display: flex; flex-direction: column; align-items: center;
  width: 100%; max-width: 520px; gap: 14px;
}
.listening-icon { font-size: 3rem; line-height: 1; margin-top: 8px; }
.listening-hint { font-size: 0.9rem; color: var(--text-dim); margin: 0; }
.listening-play-btns { display: flex; gap: 10px; align-items: center; }
.listening-translation { font-size: 0.9rem; color: var(--text-dim); margin-top: 4px; }
.listening-translation strong { color: var(--text); }

/* ─── Grammar Modal ───────────────────────────────────────── */
.grammar-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: var(--overlay-bg); z-index: 200;
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.grammar-panel {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 24px; text-align: left;
  font-size: 0.85rem; line-height: 1.6; color: var(--text);
  max-width: 520px; width: 100%; max-height: 80vh; overflow-y: auto; position: relative;
}
.grammar-close {
  position: absolute; top: 12px; right: 14px;
  background: none; border: none; color: var(--text-dim);
  font-size: 1.4rem; cursor: pointer; padding: 4px 8px;
  border-radius: 6px; transition: all 0.15s;
}
.grammar-close:hover { color: var(--text); background: var(--hover-bg); }

/* ─── Loading Spinner ─────────────────────────────────────── */
.loading-spinner-wrap {
  display: flex; align-items: center; justify-content: center;
  padding: 48px 20px;
}
.loading-spinner {
  width: 36px; height: 36px; border-radius: 50%;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  animation: spinner-rotate 0.75s linear infinite;
}
@keyframes spinner-rotate { to { transform: rotate(360deg); } }

/* ─── Delete Undo Toast ────────────────────────────────────── */
.delete-undo-toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%);
  background: var(--card); color: var(--text);
  border: 1px solid var(--border); border-left: 4px solid #e53935;
  padding: 12px 20px; border-radius: 10px;
  display: flex; align-items: center; gap: 16px;
  box-shadow: 0 4px 20px var(--shadow-color);
  z-index: 10001; font-size: 0.9rem; white-space: nowrap;
  animation: delete-toast-in 0.22s ease-out;
}
.delete-undo-btn {
  background: none; border: none; color: var(--accent);
  font-weight: 700; cursor: pointer; font-size: 0.9rem; padding: 0;
  text-decoration: underline; text-underline-offset: 2px;
}
.delete-undo-btn:hover { color: var(--accent-light); }
.delete-undo-countdown { font-size: 0.78rem; color: var(--text-dim); }
@keyframes delete-toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(12px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* AI Spinner */
#ai-spinner {
  position: fixed; top: 14px; right: 14px; z-index: 9999;
  display: none; align-items: center; gap: 8px;
  padding: 8px 14px; border-radius: 999px;
  background: linear-gradient(135deg, #6c63ff, #b388ff, #26a69a);
  background-size: 200% 200%;
  color: #fff; font-size: 0.8rem; font-weight: 600;
  box-shadow: 0 4px 18px rgba(108,99,255,0.45);
  animation: ai-shimmer 2s linear infinite, ai-pulse 1.4s ease-in-out infinite;
}
#ai-spinner.active { display: inline-flex; }
#ai-spinner .dot { width: 8px; height: 8px; border-radius: 50%; background: #fff; animation: ai-dot 1s ease-in-out infinite; }
@keyframes ai-shimmer { 0% {background-position:0% 50%;} 100% {background-position:200% 50%;} }
@keyframes ai-pulse { 0%,100% {transform:scale(1);} 50% {transform:scale(1.05);} }
@keyframes ai-dot { 0%,100% {opacity:0.4;} 50% {opacity:1;} }

/* ─── Settings Sub-tabs ───────────────────────────────────── */
.settings-subtabs {
  display: flex; flex-wrap: wrap; gap: 4px;
  border-bottom: 1px solid var(--border); margin-bottom: 24px; overflow-x: auto;
}
.settings-subtab {
  padding: 10px 18px; cursor: pointer;
  color: var(--text-dim); font-weight: 500; font-size: 0.9rem;
  border-bottom: 2px solid transparent; transition: all 0.15s; white-space: nowrap;
}
.settings-subtab:hover { color: var(--text); }
.settings-subtab.active { color: var(--accent); border-bottom-color: var(--accent); }
#panel-settings [data-stab]:not(.stab-active) { display: none; }

/* Pill-style settings tabs (2-tab layout) */
.settings-pill-tabs {
  background: var(--surface); border-radius: 12px; padding: 4px;
  border: 1px solid var(--border); gap: 4px; margin-bottom: 24px;
}
.settings-pill-tabs .settings-subtab {
  border-bottom: none; border-radius: 8px; background: transparent;
  flex: 1; text-align: center;
}
.settings-pill-tabs .settings-subtab.active {
  background: var(--accent); color: #fff; border-bottom: none;
}
.settings-pill-tabs .settings-subtab:hover:not(.active) {
  background: var(--hover-bg); color: var(--text);
}

/* ─── Theme Toggle Button ─────────────────────────────────── */
.theme-toggle-btn { font-size: 1rem; }

/* ─── Daily Goal Progress Bar ────────────────────────────── */
.daily-goal-bar {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 14px; margin-bottom: 16px;
}
.daily-goal-header {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.85rem; color: var(--text-dim); margin-bottom: 6px;
}
.daily-goal-header .goal-done { color: var(--green); font-weight: 700; }
.daily-goal-track {
  background: var(--border); border-radius: 4px; height: 6px; overflow: hidden;
}
.daily-goal-fill {
  background: var(--accent); height: 100%; border-radius: 4px;
  transition: width 0.4s ease;
}
.daily-goal-fill.goal-complete { background: var(--green); }

/* Goal-met calendar indicator */
.cal-indicator.goal-met { font-size: 0.6rem; color: var(--green); }

/* ─── Icon Button ─────────────────────────────────────────── */
.icon-btn {
  background: none; border: 1px solid var(--border);
  color: var(--text-dim); width: 36px; height: 36px;
  border-radius: 8px; cursor: pointer; font-size: 1.1rem;
  display: inline-flex; align-items: center; justify-content: center;
  transition: all 0.15s;
}
.icon-btn:hover { color: var(--text); border-color: var(--accent); }

/* ─── Grammar Panel Details ───────────────────────────────── */
.grammar-panel .grammar-title { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent-light); margin-bottom: 12px; font-weight: 600; }
.grammar-panel .grammar-sentence { font-size: 1.1rem; font-weight: 600; margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.grammar-panel .grammar-word { color: var(--accent-light); font-weight: 600; }
.grammar-panel .grammar-note { color: var(--text-dim); font-style: italic; margin-top: 8px; }
.grammar-more-btn {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 14px; padding: 6px 14px; border-radius: 8px;
  background: rgba(108,99,255,0.12); border: 1px solid rgba(108,99,255,0.3);
  color: var(--accent-light); font-size: 0.8rem; font-weight: 600;
  cursor: pointer; transition: all 0.15s;
}
.grammar-more-btn:hover { background: rgba(108,99,255,0.22); border-color: var(--accent); }
.grammar-more-btn .arrow { transition: transform 0.25s; display: inline-block; }
.grammar-more-btn.expanded .arrow { transform: rotate(180deg); }
.grammar-extended { display: none; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
.grammar-extended.visible { display: block; }
.grammar-extended h4 { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent-light); margin: 14px 0 8px 0; font-weight: 600; }
.grammar-extended h4:first-child { margin-top: 0; }
.grammar-extended p { margin: 6px 0; color: var(--text); font-size: 0.85rem; line-height: 1.6; }
.grammar-extended .conj-table { width: 100%; border-collapse: collapse; margin: 8px 0 12px 0; font-size: 0.8rem; }
.grammar-extended .conj-table th { text-align: left; padding: 5px 10px; color: var(--accent-light); border-bottom: 1px solid var(--border); font-weight: 600; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.04em; }
.grammar-extended .conj-table td { padding: 4px 10px; border-bottom: 1px solid rgba(45,49,69,0.5); color: var(--text); }
.grammar-extended .conj-table tr:last-child td { border-bottom: none; }
.grammar-extended .example { background: rgba(255,255,255,0.03); border-left: 3px solid var(--accent); padding: 8px 12px; border-radius: 0 6px 6px 0; margin: 8px 0; font-size: 0.83rem; }
.grammar-extended .example .de { font-weight: 600; color: var(--text); }
.grammar-extended .example .en { color: var(--text-dim); font-style: italic; }
.grammar-extended .tip { background: rgba(76,175,80,0.08); border: 1px solid rgba(76,175,80,0.2); border-radius: 8px; padding: 8px 12px; margin: 10px 0; font-size: 0.82rem; color: var(--green); }

/* ─── Prefix/Suffix/Synonym Panels ────────────────────────── */
.prefix-panel {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 24px; text-align: left;
  font-size: 0.85rem; line-height: 1.6; color: var(--text);
  max-width: 560px; width: 100%; max-height: 80vh; overflow-y: auto; position: relative;
}
.prefix-panel .prefix-title { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent-light); margin-bottom: 6px; font-weight: 600; }
.prefix-panel .prefix-base { font-size: 1.1rem; font-weight: 600; margin-bottom: 4px; }
.prefix-panel .prefix-note { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 16px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.prefix-item { padding: 10px 0; border-bottom: 1px solid rgba(45,49,69,0.5); }
.prefix-item:last-child { border-bottom: none; }
.prefix-item .prefix-verb-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.prefix-item .prefix-verb { font-weight: 700; font-size: 0.95rem; color: var(--text); }
.prefix-item .prefix-verb .prefix-highlight { color: var(--accent-light); }
.prefix-item .prefix-meaning { color: var(--text-dim); font-size: 0.85rem; }
.prefix-item .prefix-tag { font-size: 0.65rem; padding: 2px 7px; border-radius: 4px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; flex-shrink: 0; }
.prefix-tag.sep { background: rgba(76,175,80,0.15); color: var(--green); }
.prefix-tag.insep { background: rgba(255,152,0,0.15); color: var(--orange); }
.prefix-item .prefix-example { font-size: 0.8rem; color: var(--text-dim); margin-top: 4px; padding-left: 12px; border-left: 2px solid var(--border); }
.prefix-item .prefix-verb .suffix-highlight { color: #ab47bc; }
.word-prefix-panel .prefix-item .prefix-verb .prefix-highlight { color: #42a5f5; }
.synonym-panel .prefix-title { color: #26a69a; }
.synonym-panel .prefix-item .prefix-verb { color: #26a69a; }
.antonym-panel .prefix-title { color: #ef5350; }
.antonym-panel .prefix-item .prefix-verb { color: #ef5350; }

/* ─── Empty State ─────────────────────────────────────────── */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-dim); }
.empty-state h3 { font-size: 1.2rem; color: var(--text); margin-bottom: 8px; }

/* ─── Word List ───────────────────────────────────────────── */
.word-list { display: flex; flex-direction: column; gap: 8px; }
.word-item {
  background: var(--card); border-radius: 12px; padding: 14px 18px;
  display: flex; align-items: center; justify-content: space-between;
  border: 1px solid var(--border);
}
.word-item .left { flex: 1; }
.word-item .learned { font-weight: 600; font-size: 1rem; }
.word-item .known { color: var(--text-dim); font-size: 0.85rem; margin-top: 2px; }
.word-item .card-dates { display: flex; gap: 10px; margin-top: 4px; }
.word-item .card-dates span { font-size: 0.7rem; color: var(--text-dim); opacity: 0.65; }
.word-item .meta { display: flex; gap: 12px; align-items: center; }
.word-item .type-badge { font-size: 0.7rem; padding: 2px 8px; border-radius: 6px; background: rgba(108,99,255,0.15); color: var(--accent-light); }
.word-item .streak { font-size: 0.8rem; color: var(--text-dim); }
.delete-btn { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 1.1rem; padding: 4px 8px; border-radius: 6px; transition: all 0.15s; }
.delete-btn:hover { color: var(--red); background: rgba(239,83,80,0.1); }

/* ─── Forms ───────────────────────────────────────────────── */
.form-section { background: var(--card); border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); margin-bottom: 20px; }
.form-section h3 { font-size: 1rem; margin-bottom: 16px; }
.form-row { display: flex; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.form-group { display: flex; flex-direction: column; gap: 4px; flex: 1; min-width: 180px; }
.form-group label { font-size: 0.8rem; color: var(--text-dim); }
input, textarea, select {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 10px 14px; color: var(--text);
  font-size: 0.9rem; font-family: inherit; outline: none; transition: border-color 0.15s;
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); }
textarea { resize: vertical; min-height: 120px; }
select option { background: var(--surface); }
.import-help { font-size: 0.8rem; color: var(--text-dim); line-height: 1.5; margin-bottom: 12px; }
.import-help code { background: var(--surface); padding: 1px 5px; border-radius: 4px; font-size: 0.78rem; }

/* ─── Search & Filter ─────────────────────────────────────── */
.controls-row { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; align-items: center; }
.search-input { flex: 1; min-width: 200px; }
.hidden { display: none; }

/* ─── Settings ────────────────────────────────────────────── */
.settings-row { display: flex; align-items: center; gap: 16px; padding: 10px 0; border-bottom: 1px solid var(--border); }
.settings-label { font-size: 0.85rem; color: var(--text-dim); display: block; margin-bottom: 4px; min-width: 140px; }
.settings-value { font-size: 0.95rem; color: var(--text); }

/* ─── Toggle Switch ───────────────────────────────────────── */
.switch { position: relative; display: inline-block; width: 48px; height: 26px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background: var(--border); border-radius: 26px; transition: .3s; }
.slider:before { position: absolute; content: ""; height: 20px; width: 20px; left: 3px; bottom: 3px; background: var(--text); border-radius: 50%; transition: .3s; }
.switch input:checked + .slider { background: var(--accent); }
.switch input:checked + .slider:before { transform: translateX(22px); }

/* ─── Student Cards ───────────────────────────────────────── */
.student-card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; cursor: pointer; transition: border-color 0.2s; }
.student-card:hover { border-color: var(--accent); }
.student-card-name { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.student-card-email { font-size: 0.85rem; color: var(--text-dim); }
.student-card-stats { display: flex; gap: 16px; margin-top: 10px; font-size: 0.85rem; color: var(--text-dim); }
.student-card-stats strong { color: var(--text); }

/* ─── Reverse Mode Toggle ─────────────────────────────────── */
.reverse-mode-toggle {
  position: absolute; top: 16px; left: 50%; transform: translateX(-50%);
  display: inline-flex; align-items: center;
  background: rgba(255,255,255,0.08); border: 1px solid var(--border);
  border-radius: 20px; padding: 3px 10px; z-index: 2;
  font-size: 0.65rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--text-dim); cursor: pointer; transition: all 0.15s;
}
.reverse-mode-toggle:hover { border-color: var(--text-dim); color: var(--text); }
.reverse-mode-toggle.active { background: rgba(108,99,255,0.15); border-color: var(--accent); color: var(--accent-light); }

/* ─── Session Summary ─────────────────────────────────────── */
.session-summary { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-top: 24px; }
.session-summary h3 { font-size: 1rem; margin-bottom: 16px; }
.session-bar-row { display: flex; gap: 8px; margin-bottom: 16px; align-items: center; }
.session-bar-label { min-width: 80px; font-size: 0.85rem; color: var(--text-dim); }
.session-bar-container { flex: 1; height: 28px; background: var(--surface); border-radius: 6px; display: flex; overflow: hidden; }
.session-bar-segment { height: 100%; display: flex; align-items: center; justify-content: center; font-size: 0.75rem; font-weight: 600; color: #fff; transition: width 0.3s; }
.session-bar-again { background: var(--red); }
.session-bar-hard { background: var(--orange); }
.session-bar-good { background: var(--accent); }
.session-bar-easy { background: var(--green); }
.session-stats-grid { display: grid; gap: 8px; margin-top: 12px; }
.session-stats-top { grid-template-columns: repeat(3, 1fr); }
.session-stats-bottom { grid-template-columns: repeat(4, 1fr); margin-top: 8px; }
.session-stat-box { background: var(--surface); border-radius: 8px; padding: 10px 6px; text-align: center; }
.session-stat-label { font-size: 0.65rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.02em; }
.session-stat-value { font-size: 1.25rem; font-weight: 700; margin-top: 2px; }

/* ─── Mnemonic Single-Card View ───────────────────────────── */
.mnemonic-list { display: flex; flex-direction: column; gap: 12px; }
.mnemonic-nav { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; }
.mnemonic-counter { font-size: 0.85rem; color: var(--text-dim); font-weight: 600; }
.mnemonic-single-card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; overflow: hidden; box-shadow: 0 2px 12px var(--shadow-color); }
.mnemonic-card-header { text-align: center; padding: 20px 16px 12px; border-bottom: 1px solid var(--border); }
.mnemonic-word-title { font-size: 1.5rem; font-weight: 700; color: var(--text); }
.mnemonic-meaning-title { font-size: 1rem; color: var(--text-dim); margin-top: 4px; }
.mnemonic-word-info { font-size: 0.85rem; color: var(--accent); margin-top: 6px; }
.mnemonic-card-body { padding: 16px; }
.mnemonic-section { margin-bottom: 14px; }
.mnemonic-label { font-size: 0.75rem; font-weight: 700; color: var(--accent-light); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px; }
.mnemonic-content { font-size: 0.9rem; line-height: 1.5; color: var(--text); }
.mnemonic-ascii { background: var(--surface); border-radius: 8px; padding: 10px; font-size: 0.75rem; line-height: 1.3; overflow-x: auto; margin: 8px 0; }
.mnemonic-image { max-width: 100%; border-radius: 10px; margin: 8px 0; }
.mnemonic-image-prompt { font-size: 0.75rem; color: var(--text-dim); margin: 4px 0; }
.mnemonic-actions { display: flex; gap: 8px; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border); justify-content: center; }
.mnemonic-loading { text-align: center; padding: 20px; color: var(--accent); font-size: 0.9rem; }
.mnemonic-error { text-align: center; padding: 12px; color: var(--red); font-size: 0.85rem; }
.mnemonic-empty { text-align: center; padding: 24px; }

/* ─── XP / Streak Topbar ──────────────────────────────────── */
.xp-topbar { display: flex; align-items: center; gap: 10px; flex: 1; margin: 0 16px; }
.streak-badge { display: flex; align-items: center; gap: 4px; font-size: 0.85rem; font-weight: 700; color: #ff9800; white-space: nowrap; }
.level-badge { background: rgba(108,99,255,0.2); border: 1px solid rgba(108,99,255,0.4); border-radius: 20px; padding: 3px 10px; font-size: 0.75rem; font-weight: 700; color: var(--accent-light); white-space: nowrap; }
.cefr-badge { background: rgba(46,204,113,0.15); border: 1px solid rgba(46,204,113,0.4); border-radius: 20px; padding: 3px 10px; font-size: 0.75rem; font-weight: 700; color: #2ecc71; white-space: nowrap; cursor: help; transition: background 0.2s; }
.cefr-badge:hover { background: rgba(46,204,113,0.25); }
/* CEFR breakdown on Progress page */
.cefr-section { margin-top: 24px; }
.cefr-section h3 { font-size: 1rem; margin-bottom: 12px; }
.cefr-level-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; font-size: 0.85rem; }
.cefr-level-label { width: 32px; font-weight: 700; flex-shrink: 0; }
.cefr-level-bar-bg { flex: 1; height: 10px; background: var(--border); border-radius: 5px; overflow: hidden; }
.cefr-level-bar-fill { height: 100%; border-radius: 5px; transition: width 0.4s ease; }
.cefr-level-bar-fill.a1 { background: #2ecc71; }
.cefr-level-bar-fill.a2 { background: #27ae60; }
.cefr-level-bar-fill.b1 { background: #f1c40f; }
.cefr-level-bar-fill.b2 { background: #e67e22; }
.cefr-level-bar-fill.c1 { background: #e74c3c; }
.cefr-level-bar-fill.c2 { background: #8e44ad; }
.cefr-level-count { width: 50px; text-align: right; font-size: 0.78rem; color: var(--text-dim); flex-shrink: 0; }
.cefr-confidence { font-size: 0.78rem; color: var(--text-dim); margin-top: 6px; }
.xp-bar-wrap { flex: 1; min-width: 60px; max-width: 200px; display: flex; align-items: center; gap: 6px; }
.xp-bar-bg { flex: 1; height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; }
.xp-bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-light)); border-radius: 4px; transition: width 0.4s ease; }
.xp-label { font-size: 0.7rem; color: var(--text-dim); white-space: nowrap; }

/* Floating +XP popup */
.xp-popup { position: fixed; pointer-events: none; z-index: 9999; font-size: 1.2rem; font-weight: 800; color: #ffd700; text-shadow: 0 0 12px rgba(255,215,0,0.6); animation: xpFloat 1.2s ease-out forwards; }
@keyframes xpFloat { 0% { opacity: 1; transform: translateY(0) scale(1); } 60% { opacity: 1; transform: translateY(-50px) scale(1.2); } 100% { opacity: 0; transform: translateY(-80px) scale(0.9); } }

/* Level-up overlay */
.levelup-overlay { position: fixed; inset: 0; background: var(--overlay-bg); display: flex; align-items: center; justify-content: center; z-index: 10000; animation: lvlFadeIn 0.3s ease; }
@keyframes lvlFadeIn { from { opacity: 0 } to { opacity: 1 } }
.levelup-card { background: var(--levelup-bg); border: 2px solid var(--accent); border-radius: 24px; padding: 40px 48px; text-align: center; max-width: 360px; width: 90%; animation: lvlPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); }
@keyframes lvlPop { from { transform: scale(0.6); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.levelup-emoji { font-size: 3rem; margin-bottom: 8px; }
.levelup-title { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent-light); font-weight: 700; margin-bottom: 8px; }
.levelup-level { font-size: 3.5rem; font-weight: 900; color: #ffd700; line-height: 1; margin-bottom: 8px; }
.levelup-desc { font-size: 0.9rem; color: var(--text-dim); margin-bottom: 24px; }
.levelup-btn { background: var(--accent); color: #fff; border: none; border-radius: 12px; padding: 12px 32px; font-size: 1rem; font-weight: 700; cursor: pointer; transition: background 0.15s; }
.levelup-btn:hover { background: var(--accent-light); }

/* ─── Login Screen ────────────────────────────────────────── */
#login-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: var(--bg); z-index: 9999; display: flex; align-items: center; justify-content: center; padding: 20px; }
#login-overlay.hidden { display: none; }
.login-container { background: var(--surface); border-radius: var(--radius); padding: 40px; max-width: 400px; width: 100%; box-shadow: 0 8px 32px var(--shadow-color); }
.login-container h2 { font-size: 1.8rem; margin-bottom: 10px; color: var(--text); }
.login-container p { color: var(--text-dim); margin-bottom: 24px; font-size: 0.95rem; }
.login-form { display: none; }
.login-form.active { display: block; }
.login-form-group { margin-bottom: 16px; }
.login-form-group label { display: block; margin-bottom: 6px; font-size: 0.85rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.05em; }
.login-form-group input { width: 100%; padding: 10px 12px; border: 1px solid var(--border); background: var(--card); color: var(--text); border-radius: 8px; font-size: 1rem; transition: border-color 0.15s; }
.login-form-group input:focus { outline: none; border-color: var(--accent); }
.login-btn { width: 100%; padding: 10px; background: var(--accent); color: #fff; border: none; border-radius: 8px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background 0.15s; margin-bottom: 12px; }
.login-btn:hover { background: var(--accent-light); }
.login-toggle { text-align: center; margin-bottom: 16px; color: var(--text-dim); font-size: 0.9rem; }
.login-toggle a { color: var(--accent); cursor: pointer; text-decoration: underline; }
.login-divider { text-align: center; margin: 20px 0; color: var(--text-dim); font-size: 0.85rem; }
.login-divider::before, .login-divider::after { content: ''; display: inline-block; width: 40%; height: 1px; background: var(--border); margin: 0 8px; vertical-align: middle; }
#google-signin-btn { width: 100%; padding: 10px; background: var(--card); color: var(--text); border: 1px solid var(--border); border-radius: 8px; font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: all 0.15s; }
#google-signin-btn:hover { background: var(--border); border-color: var(--text-dim); }
.login-error { color: var(--red); font-size: 0.9rem; margin-bottom: 12px; padding: 8px; background: rgba(239,83,80,0.1); border-radius: 6px; display: none; }
.login-error.show { display: block; }
.login-loading { text-align: center; color: var(--text-dim); font-size: 0.95rem; padding: 20px; }

/* ─── Calendar ────────────────────────────────────────────── */
.calendar-container { margin-bottom: 32px; }
.calendar-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.calendar-header h4 { font-size: 1rem; font-weight: 600; }
.calendar-nav { display: flex; gap: 8px; }
.calendar-nav button { background: var(--surface); border: 1px solid var(--border); color: var(--text-dim); border-radius: 8px; padding: 6px 12px; cursor: pointer; font-size: 0.85rem; }
.calendar-nav button:hover { color: var(--text); border-color: var(--text-dim); }
.calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; text-align: center; }
.calendar-day-header { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; padding: 4px 0; font-weight: 600; }
.calendar-cell { position: relative; aspect-ratio: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; border-radius: 8px; font-size: 0.8rem; cursor: default; background: var(--surface); transition: background 0.2s, box-shadow 0.2s; }
.calendar-cell.empty { background: transparent; }
.calendar-cell.today { border: 2px solid var(--accent); }
.calendar-cell.activity-none { background: var(--surface); }
.calendar-cell.activity-low { background: rgba(100,180,255,0.25); }
.calendar-cell.activity-medium { background: rgba(60,160,255,0.45); }
.calendar-cell.activity-high { background: rgba(50,210,80,0.45); }
.calendar-cell.activity-complete { background: rgba(255,215,0,0.4); }
.calendar-cell.activity-multi { background: rgba(255,200,0,0.55); box-shadow: inset 0 0 12px rgba(255,215,0,0.3); }
.calendar-cell.activity-low .cal-day-num { color: #64b4ff; font-weight: 600; }
.calendar-cell.activity-medium .cal-day-num { color: #40c8ff; font-weight: 700; }
.calendar-cell.activity-high .cal-day-num { color: #50e860; font-weight: 700; }
.calendar-cell.activity-complete .cal-day-num { color: #ffe040; font-weight: 700; }
.calendar-cell.activity-multi .cal-day-num { color: #ffcc00; font-weight: 800; text-shadow: 0 0 6px rgba(255,200,0,0.5); }
.cal-day-num { font-size: 0.7rem; font-weight: 500; }
.cal-indicators { display: flex; gap: 2px; align-items: center; margin-top: 2px; }
.cal-indicator { font-size: 0.75rem; line-height: 1; }
.cal-indicator.none { color: var(--text-dim); opacity: 0.3; font-size: 0.5rem; }
.cal-indicator.partial { color: #5b9bd5; }
.cal-indicator.complete { color: #ffd700; }
.cal-indicator.multi-pass { color: #ffd700; text-shadow: 0 0 6px rgba(255,215,0,0.5); }
.cal-indicator.fire { font-size: 0.6rem; }
.calendar-legend { display: flex; gap: 16px; margin-top: 12px; flex-wrap: wrap; }
.calendar-legend-item { display: flex; align-items: center; gap: 4px; font-size: 0.75rem; color: var(--text-dim); }
.calendar-legend-icon { font-size: 0.85rem; }

/* ─── Daily Stats ─────────────────────────────────────────── */
.daily-stats { display: flex; gap: 12px; margin-bottom: 24px; flex-wrap: wrap; }
.daily-stat { background: var(--card); border-radius: 12px; padding: 12px 16px; flex: 1; min-width: 100px; text-align: center; }
.daily-stat .ds-value { font-size: 1.4rem; font-weight: 700; }
.daily-stat .ds-label { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; margin-top: 2px; }
.daily-stat .ds-value.gold { color: #ffd700; }
.daily-stat .ds-value.fire { color: var(--orange); }

/* ─── Leaderboard ─────────────────────────────────────────── */
.leaderboard-container { margin-top: 32px; }
.leaderboard-tabs { display: flex; gap: 0; margin-bottom: 16px; }
.lb-tab { padding: 8px 16px; font-size: 0.85rem; cursor: pointer; color: var(--text-dim); border-bottom: 2px solid transparent; font-weight: 500; }
.lb-tab:hover { color: var(--text); }
.lb-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.leaderboard-table { width: 100%; border-collapse: separate; border-spacing: 0 4px; }
.leaderboard-table th { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; text-align: left; padding: 8px 12px; font-weight: 600; }
.leaderboard-table td { padding: 10px 12px; background: var(--card); font-size: 0.9rem; }
.leaderboard-table tr td:first-child { border-radius: 8px 0 0 8px; }
.leaderboard-table tr td:last-child { border-radius: 0 8px 8px 0; }
.leaderboard-table tr.me td { background: rgba(108,99,255,0.15); border: 1px solid var(--accent); }
.leaderboard-table tr.me td:first-child { border-radius: 8px 0 0 8px; border-right: none; }
.leaderboard-table tr.me td:last-child { border-radius: 0 8px 8px 0; border-left: none; }
.leaderboard-table tr.me td:not(:first-child):not(:last-child) { border-top: 1px solid var(--accent); border-bottom: 1px solid var(--accent); border-left: none; border-right: none; }
.lb-rank { font-weight: 700; width: 40px; text-align: center; }
.lb-rank.gold { color: #ffd700; }
.lb-rank.silver { color: #c0c0c0; }
.lb-rank.bronze { color: #cd7f32; }
.lb-medal { font-size: 0.85rem; margin-left: 4px; }
.lb-name { font-weight: 500; }
.lb-xp { font-weight: 700; color: var(--accent); }
.lb-streak { color: var(--orange); }
.lb-no-data { text-align: center; color: var(--text-dim); padding: 24px; font-size: 0.9rem; }
.medal-gold { color: #ffd700; }
.medal-silver { color: #c0c0c0; }
.medal-bronze { color: #cd7f32; }

/* ─── Teacher Dashboard ───────────────────────────────────── */
.class-overview { background: var(--card); border-radius: var(--radius); padding: 20px; margin-bottom: 24px; }
.class-overview h3 { font-size: 1rem; font-weight: 600; margin-bottom: 16px; }
.class-stats-row { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.class-stat { background: var(--surface); border-radius: 10px; padding: 12px 16px; flex: 1; min-width: 120px; text-align: center; }
.class-stat .cs-value { font-size: 1.3rem; font-weight: 700; }
.class-stat .cs-label { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; margin-top: 2px; }
.set-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.set-tab { padding: 8px 16px; border-radius: 20px; border: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer; font-size: 0.85rem; white-space: nowrap; transition: all 0.2s; }
.set-tab:hover { border-color: var(--accent); }
.set-tab.active { background: rgba(108,99,255,0.15); border-color: var(--accent); color: var(--accent-light); }
.set-tab.new-set { border-style: dashed; color: var(--text-dim); }
.set-tab.new-set:hover { color: var(--accent); border-color: var(--accent); }
.set-tab-actions { margin-left: 6px; }
.teacher-sub-tabs { display: flex; gap: 0; margin-bottom: 20px; border-bottom: 1px solid var(--border); }
.teacher-sub-tab { padding: 8px 18px; font-size: 0.9rem; cursor: pointer; color: var(--text-dim); border-bottom: 2px solid transparent; margin-bottom: -1px; transition: color 0.15s, border-color 0.15s; font-weight: 500; }
.teacher-sub-tab:hover:not(.active) { color: var(--text); }
.teacher-sub-tab.active { color: var(--text); border-bottom-color: var(--accent); }
.analytics-bar-row { display: flex; align-items: center; gap: 8px; margin: 3px 0; }
.analytics-bar-label { font-size: 0.8rem; color: var(--text-dim); width: 72px; flex-shrink: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.analytics-bar-track { flex: 1; background: var(--surface); border-radius: 4px; height: 18px; overflow: hidden; }
.analytics-bar-fill { height: 100%; border-radius: 4px; min-width: 2px; }
.analytics-bar-value { font-size: 0.78rem; color: var(--text-dim); width: 52px; text-align: right; flex-shrink: 0; }
.analytics-table { width: 100%; border-collapse: separate; border-spacing: 0 3px; font-size: 0.88rem; }
.analytics-table th { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; text-align: center; padding: 6px 10px; font-weight: 600; }
.analytics-table th:first-child { text-align: left; }
.analytics-table td { padding: 9px 10px; background: var(--card); text-align: center; }
.analytics-table td:first-child { text-align: left; border-radius: 8px 0 0 8px; }
.analytics-table td:last-child { border-radius: 0 8px 8px 0; }

/* ─── Marketplace ─────────────────────────────────────────── */
.marketplace-search-row { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; }
.marketplace-search-row input { flex: 1; min-width: 200px; padding: 10px 14px; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 0.95rem; }
.marketplace-search-row select { padding: 10px 14px; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 0.9rem; }
.marketplace-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.marketplace-card { background: var(--card); border-radius: var(--radius); padding: 20px; border: 1px solid var(--border); transition: border-color 0.15s; display: flex; flex-direction: column; gap: 10px; }
.marketplace-card:hover { border-color: var(--accent); }
.marketplace-card-title { font-size: 1rem; font-weight: 700; }
.marketplace-card-meta { font-size: 0.8rem; color: var(--text-dim); display: flex; gap: 12px; flex-wrap: wrap; }
.marketplace-card-desc { font-size: 0.875rem; color: var(--text-dim); line-height: 1.5; flex: 1; }
.marketplace-card-footer { display: flex; align-items: center; justify-content: space-between; margin-top: auto; flex-wrap: wrap; gap: 8px; }
.marketplace-stars { color: #f5c842; font-size: 0.9rem; letter-spacing: 2px; }
.marketplace-stars-count { color: var(--text-dim); font-size: 0.8rem; margin-left: 4px; }
.marketplace-downloads { font-size: 0.8rem; color: var(--text-dim); }
.marketplace-empty { text-align: center; padding: 60px 20px; color: var(--text-dim); font-size: 0.95rem; }
.marketplace-loading { text-align: center; padding: 40px; color: var(--text-dim); }
.preview-card-list { display: flex; flex-direction: column; gap: 8px; max-height: 300px; overflow-y: auto; margin: 12px 0; }
.preview-card-row { display: flex; gap: 8px; background: var(--surface); border-radius: 8px; padding: 10px 14px; font-size: 0.9rem; }
.preview-card-row .pf { flex: 1; font-weight: 500; }
.preview-card-row .pb { flex: 1; color: var(--text-dim); }
.star-rating { display: flex; gap: 4px; font-size: 1.4rem; }
.star-rating span { cursor: pointer; color: var(--border); transition: color 0.1s; }
.star-rating span.lit { color: #f5c842; }

/* ─── Responsive ──────────────────────────────────────────── */
@media (max-width: 600px) {
  body { font-size: 1.1rem; }
  .topbar { padding: 14px 16px; }
  .topbar h1 { font-size: 1.5rem; }
  .topbar-actions { flex-wrap: wrap; gap: 6px; }
  .tabs { padding: 0 12px; overflow-x: auto; }
  .tab { padding: 14px 16px; font-size: 1.05rem; white-space: nowrap; }
  .panel { padding: 16px; }
  .stat-card .label { font-size: 0.9rem; }
  .stat-card .value { font-size: 2rem; }
  .card-container { height: 280px; }
  .card-word { font-size: 1.6rem; }
  .card-phonetics { font-size: 0.8rem; }
  .card-lang { font-size: 0.9rem; }
  .card-hint { font-size: 1rem; }
  .card-type-badge { font-size: 0.85rem; }
  .card-counter { font-size: 0.85rem; }
  .btn { padding: 14px 18px; font-size: 1.05rem; }
  .btn-sm { padding: 10px 14px; font-size: 0.95rem; }
  .rating-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; width: 100%; max-width: 360px; }
  .rating-buttons .btn { width: 100%; padding: 16px; font-size: 1.1rem; }
  .word-item .learned { font-size: 1.15rem; }
  .word-item .known { font-size: 1rem; }
  .word-item .type-badge { font-size: 0.85rem; }
  .word-item .streak { font-size: 0.95rem; }
  .delete-btn { font-size: 1.4rem; }
  .progress-text { font-size: 1rem; }
  .grammar-panel { font-size: 1.1rem; line-height: 1.7; }
  .grammar-panel .grammar-title { font-size: 0.95rem; }
  .grammar-panel .grammar-sentence { font-size: 1.25rem; }
  input, textarea, select { font-size: 1.05rem; padding: 14px; }
  .form-section h3 { font-size: 1.15rem; }
  .form-group label { font-size: 0.95rem; }
  .import-help { font-size: 0.95rem; }
  .search-input { font-size: 1.05rem; }
  .form-row { flex-direction: column; }
  .speak-btn { font-size: 2.2rem; padding: 10px; }
  .empty-state h3 { font-size: 1.4rem; }
  .empty-state p { font-size: 1.05rem; }
  .reverse-mode-toggle { font-size: 0.7rem; padding: 3px 10px; }
  .session-summary { padding: 16px; }
  .session-summary h3 { font-size: 1.1rem; }
  .session-bar-label { min-width: 70px; font-size: 0.8rem; }
  .session-stats-top { grid-template-columns: repeat(3, 1fr); }
  .session-stats-bottom { grid-template-columns: repeat(2, 1fr); }
  .xp-topbar { margin: 0 6px; gap: 6px; }
  .xp-bar-wrap { max-width: 80px; }
  .xp-label { display: none; }
}

/* ═══════════════════════════════════════════════════════════
   Quiz Module
   ═══════════════════════════════════════════════════════════ */

/* Setup screen */
.quiz-setup { max-width: 400px; margin: 20px auto; text-align: center; }
.quiz-setup-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.quiz-setup-row label { font-weight: 600; color: var(--text); }
.quiz-select {
  padding: 10px 14px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font-size: 0.95rem; min-width: 140px;
}
.quiz-stats-mini { color: var(--text-dim); font-size: 0.85rem; margin-bottom: 18px; }
.quiz-start-btn { width: 100%; padding: 14px; font-size: 1.1rem; }
.quiz-empty { text-align: center; color: var(--text-dim); padding: 40px 20px; font-size: 1rem; }

/* Progress bar */
.quiz-progress { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.quiz-progress-bar { flex: 1; height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.quiz-progress-fill { height: 100%; background: var(--accent); transition: width 0.3s ease; border-radius: 3px; }
.quiz-progress-text { font-size: 0.85rem; color: var(--text-dim); white-space: nowrap; }
.quiz-score { font-size: 0.85rem; color: var(--accent); font-weight: 600; white-space: nowrap; }

/* Question card */
.quiz-question {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; text-align: center; margin-bottom: 16px;
}
.quiz-label { font-size: 0.9rem; color: var(--text-dim); margin-bottom: 8px; }
.quiz-prompt { font-size: 1.5rem; font-weight: 700; color: var(--text); margin-bottom: 24px; }

/* Multiple choice options */
.quiz-options { display: grid; gap: 10px; }
.quiz-option {
  padding: 14px 18px; background: var(--surface); border: 2px solid var(--border);
  border-radius: 12px; color: var(--text); font-size: 1rem; cursor: pointer;
  transition: all 0.15s ease; text-align: left;
}
.quiz-option:hover:not(:disabled) { border-color: var(--accent); background: var(--hover-bg); }
.quiz-option.quiz-correct { border-color: var(--green); background: rgba(76, 175, 80, 0.15); color: var(--green); }
.quiz-option.quiz-wrong { border-color: var(--red); background: rgba(239, 83, 80, 0.15); color: var(--red); }
.quiz-option:disabled { cursor: default; opacity: 0.8; }

/* Fill-in-the-blank input */
.quiz-input-row { display: flex; gap: 10px; }
.quiz-text-input {
  flex: 1; padding: 14px 16px; background: var(--surface); border: 2px solid var(--border);
  border-radius: 12px; color: var(--text); font-size: 1.1rem; outline: none;
}
.quiz-text-input:focus { border-color: var(--accent); background: var(--input-focus-bg); }
.quiz-text-input.quiz-correct { border-color: var(--green); background: rgba(76, 175, 80, 0.1); }
.quiz-text-input.quiz-wrong { border-color: var(--red); background: rgba(239, 83, 80, 0.1); }
.quiz-submit-btn { padding: 14px 20px; font-size: 1.2rem; border-radius: 12px; }

/* Feedback */
.quiz-feedback { text-align: center; margin-top: 12px; padding: 14px; border-radius: 12px; font-size: 1.05rem; font-weight: 600; }
.quiz-fb-correct { color: var(--green); }
.quiz-fb-wrong { color: var(--red); }
.quiz-fb-icon { font-size: 1.2em; }
.quiz-fb-answer { font-weight: 400; color: var(--text-dim); margin-left: 8px; }
.quiz-next-btn { margin-top: 14px; padding: 12px 32px; }

/* Results */
.quiz-results { text-align: center; padding: 30px 20px; }
.quiz-results-emoji { font-size: 3rem; margin-bottom: 12px; }
.quiz-results-score { font-size: 2.2rem; font-weight: 700; color: var(--text); }
.quiz-results-pct { font-size: 1.1rem; color: var(--text-dim); margin-top: 4px; }
.quiz-results-xp { font-size: 1rem; color: var(--accent); font-weight: 600; margin-top: 12px; }

/* ═══════════════════════════════════════════════════════════
   Speech Recognition
   ═══════════════════════════════════════════════════════════ */

.card-audio-btns { display: flex; gap: 8px; justify-content: center; margin-top: 8px; }
.speech-mic { background: rgba(239, 83, 80, 0.12); border-color: var(--red); }
.speech-mic:hover { background: rgba(239, 83, 80, 0.25); }
.speech-mic.speech-active {
  background: var(--red); color: #fff; animation: speech-pulse 1s ease-in-out infinite;
}
@keyframes speech-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.speech-feedback {
  text-align: center; padding: 10px 16px; border-radius: 10px;
  font-size: 0.9rem; margin-top: 8px; min-height: 20px;
  transition: all 0.2s ease;
}
.speech-fb-listening { color: var(--accent); }
.speech-fb-correct { color: var(--green); font-weight: 600; }
.speech-fb-wrong { color: var(--red); }
.speech-fb-error { color: var(--text-dim); }

/* ═══════════════════════════════════════════════════════════
   Card Tags & Categories
   ═══════════════════════════════════════════════════════════ */

.tag-bar {
  display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 0;
  min-height: 0; /* collapse when empty */
}
.tag-chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 12px; border-radius: 20px; font-size: 0.8rem; cursor: pointer;
  background: rgba(108, 99, 255, 0.12); color: var(--accent); border: 1px solid transparent;
  transition: all 0.15s ease;
}
.tag-chip:hover { background: rgba(108, 99, 255, 0.22); }
.tag-chip.tag-active { background: var(--accent); color: #fff; border-color: var(--accent); }
.tag-chip.tag-clear { background: rgba(239, 83, 80, 0.12); color: var(--red); font-weight: 700; }
.tag-chip.tag-clear:hover { background: rgba(239, 83, 80, 0.25); }
.tag-chip.tag-removable { cursor: default; }
.tag-chip.tag-removable button {
  background: none; border: none; color: inherit; cursor: pointer;
  font-size: 1em; padding: 0 2px; opacity: 0.7;
}
.tag-chip.tag-removable button:hover { opacity: 1; }

.tag-mini {
  display: inline-block; padding: 1px 6px; border-radius: 8px; font-size: 0.7rem;
  background: rgba(108, 99, 255, 0.1); color: var(--accent); margin-right: 3px;
}
.word-item-tags { display: flex; flex-wrap: wrap; gap: 3px; margin-top: 3px; }
.tag-btn { color: var(--accent) !important; }

/* Tag editor popup */
.tag-editor-popup {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; z-index: 1000; min-width: 280px; max-width: 360px;
  box-shadow: 0 8px 32px var(--shadow-color);
}
.tag-editor-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 12px; font-weight: 600; color: var(--text);
}
.tag-editor-close { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 1.3rem; }
.tag-editor-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; min-height: 28px; }
.tag-editor-add { display: flex; gap: 8px; }
.tag-editor-add input {
  flex: 1; padding: 8px 12px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font-size: 0.9rem;
}
.tag-editor-add input:focus { border-color: var(--accent); outline: none; }

/* ═══════════════════════════════════════════════════════════
   Badges & Achievements
   ═══════════════════════════════════════════════════════════ */

.badge-section { margin: 20px 0; }
.badge-section h4 { margin-bottom: 12px; color: var(--text); }
.badge-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 10px;
}
.badge-item {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 12px 8px; border-radius: 12px; text-align: center;
  transition: all 0.2s ease;
}
.badge-earned {
  background: rgba(108, 99, 255, 0.1); border: 1px solid var(--accent);
}
.badge-locked {
  background: var(--surface); border: 1px solid var(--border); opacity: 0.45;
}
.badge-icon { font-size: 1.8rem; }
.badge-label { font-size: 0.7rem; color: var(--text-dim); line-height: 1.2; }
.badge-earned .badge-label { color: var(--text); font-weight: 600; }

/* Badge toast */
.badge-toast {
  position: fixed; top: 20px; left: 50%; transform: translateX(-50%) translateY(-80px);
  background: var(--surface); border: 2px solid var(--accent); border-radius: 14px;
  padding: 12px 24px; display: flex; align-items: center; gap: 10px;
  z-index: 2000; box-shadow: 0 8px 32px var(--shadow-color);
  opacity: 0; transition: all 0.4s ease;
}
.badge-toast-show { transform: translateX(-50%) translateY(0); opacity: 1; }
.badge-toast-icon { font-size: 1.6rem; }
.badge-toast-text { font-size: 0.95rem; font-weight: 600; color: var(--text); }

/* ─── Home Page ──────────────────────────────────────── */
.home-page {
  max-width: 520px; margin: 0 auto; padding: 32px 16px;
  display: flex; flex-direction: column; gap: 24px;
}
.home-greeting {
  font-size: 1.5rem; font-weight: 700; color: var(--text);
  text-align: center;
}
.home-stats {
  display: flex; gap: 12px; justify-content: center;
}
.home-stat-card {
  flex: 1; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 12px; text-align: center;
}
.home-stat-value {
  font-size: 1.8rem; font-weight: 700; line-height: 1.1;
}
.home-stat-value.accent { color: var(--accent); }
.home-stat-value.orange { color: var(--orange); }
.home-stat-value.green { color: var(--green); }
.home-stat-label {
  font-size: 0.78rem; color: var(--text-dim); margin-top: 4px;
}
.home-actions {
  display: flex; gap: 10px; flex-wrap: wrap; justify-content: center;
}
.home-action-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 12px; font-size: 0.95rem;
  font-weight: 600; cursor: pointer; transition: transform 0.15s;
}
.home-action-btn:hover { transform: translateY(-2px); }
.home-action-icon { font-size: 1.2rem; }
.home-streak-banner {
  text-align: center; font-size: 1.1rem; color: var(--text);
  padding: 10px; background: var(--surface); border-radius: 12px;
  border: 1px solid var(--border);
}
.home-streak-fire { font-size: 1.3rem; vertical-align: middle; }
.home-badge-preview {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
  align-items: center;
}
.home-badges-label {
  width: 100%; text-align: center; font-size: 0.8rem;
  color: var(--text-dim); margin-bottom: 2px;
}
.home-badge-mini {
  font-size: 1.6rem; cursor: default;
  transition: transform 0.15s;
}
.home-badge-mini:hover { transform: scale(1.2); }

/* ─── Pair Flags (top bar) ───────────────────────────── */
.pair-flags {
  font-size: 0.85em; opacity: 0.85; margin-left: 4px;
  white-space: nowrap;
}

/* ─── Back-to-home button ────────────────────────────── */
.back-to-home {
  margin-bottom: 16px; font-size: 0.85rem; color: var(--text-dim);
  display: inline-flex; align-items: center; gap: 4px;
}
.back-to-home:hover { color: var(--accent); }

/* ─── Card Validation Banner ─────────────────────────── */
.validation-banner {
  margin-top: 12px; padding: 12px 16px;
  background: rgba(255, 152, 0, 0.08); border: 1px solid rgba(255, 152, 0, 0.3);
  border-radius: 12px;
}
.validation-header {
  display: flex; align-items: center; gap: 6px; margin-bottom: 8px;
  flex-wrap: wrap;
}
.validation-icon { font-size: 1.1rem; color: var(--orange); }
.validation-title { font-weight: 600; font-size: 0.88rem; color: var(--orange); }
.validation-bulk-actions { margin-left: auto; display: flex; gap: 4px; }
.validation-issue {
  padding: 8px 0; border-top: 1px solid rgba(255, 152, 0, 0.15);
}
.validation-issue:first-of-type { border-top: none; }
.validation-diff { font-size: 0.88rem; line-height: 1.5; }
.validation-field {
  font-weight: 600; font-size: 0.78rem; color: var(--text-dim);
  text-transform: uppercase; letter-spacing: 0.03em;
}
.validation-old {
  text-decoration: line-through; color: var(--red); opacity: 0.85;
}
.validation-new {
  font-weight: 600; color: var(--green);
}
.validation-reason {
  font-size: 0.8rem; color: var(--text-dim); margin: 2px 0 6px;
  font-style: italic;
}
.validation-actions { display: flex; gap: 8px; }
/* Ensure validation buttons respond to taps on mobile without delay */
.validation-banner button {
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(0,0,0,0.1);
  cursor: pointer;
  position: relative;
  z-index: 50;
  min-height: 36px;
  min-width: 44px;
  user-select: none;
  -webkit-user-select: none;
}
.validation-badge {
  background: rgba(255, 152, 0, 0.15) !important; color: var(--orange) !important;
  cursor: help;
}
.word-item.has-validation {
  border-left: 3px solid var(--orange);
}
/* Compact validation in word list */
.word-item .validation-banner {
  margin-top: 8px; padding: 8px 12px; font-size: 0.85rem;
}

/* ─── Inline Add button (Words / Sentences / Settings) ─── */
.btn-add-inline {
  flex-shrink: 0; padding: 8px 14px;
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 0.85rem; border-radius: 10px; line-height: 1;
  white-space: nowrap; font-weight: 600;
}

/* ─── Admin Tools ─── */
.admin-action-card {
  padding: 12px 16px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface);
}
.admin-last-run {
  font-size: 0.75rem; color: var(--text-dim); white-space: nowrap;
  text-align: right; min-width: 100px;
}

/* ═══════════════════════════════════════════════════════════
   ONBOARDING WIZARD
   ═══════════════════════════════════════════════════════════ */
.ob-overlay {
  position: fixed; inset: 0; z-index: 9000;
  background: var(--overlay-bg);
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
  animation: ob-fade-in 0.25s ease;
}
.ob-overlay.ob-fade-out { animation: ob-fade-out 0.3s ease forwards; }
@keyframes ob-fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes ob-fade-out { from { opacity: 1; } to { opacity: 0; } }

.ob-modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px 28px;
  width: 100%; max-width: 480px;
  box-shadow: 0 24px 64px var(--shadow-color);
  position: relative;
  animation: ob-slide-up 0.3s ease;
}
@keyframes ob-slide-up {
  from { transform: translateY(24px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.ob-dots {
  display: flex; gap: 8px; justify-content: center; margin-bottom: 28px;
}
.ob-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--border); transition: background 0.2s, transform 0.2s;
}
.ob-dot.active { background: var(--accent); transform: scale(1.3); }

.ob-step { display: none; }
.ob-step.active { display: block; }

.ob-emoji { font-size: 2.8rem; text-align: center; margin-bottom: 12px; }
.ob-title {
  font-size: 1.25rem; font-weight: 700; text-align: center;
  margin-bottom: 8px; color: var(--text);
}
.ob-desc {
  font-size: 0.9rem; color: var(--text-dim); text-align: center;
  margin-bottom: 24px; line-height: 1.5;
}

.ob-lang-row {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 28px; flex-wrap: wrap;
}
.ob-lang-col { flex: 1; min-width: 130px; display: flex; flex-direction: column; gap: 6px; }
.ob-label { font-size: 0.8rem; color: var(--text-dim); font-weight: 500; }
.ob-select {
  padding: 10px 12px; background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; color: var(--text); font-size: 0.95rem; cursor: pointer;
}
.ob-lang-arrow { font-size: 1.2rem; color: var(--text-dim); flex-shrink: 0; }

.ob-choices { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.ob-choice {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px; background: var(--card);
  border: 1px solid var(--border); border-radius: 12px;
  cursor: pointer; text-align: left; width: 100%;
  transition: border-color 0.15s, background 0.15s;
  color: var(--text);
}
.ob-choice:hover { border-color: var(--accent); background: var(--hover-bg); }
.ob-choice-icon { font-size: 1.6rem; flex-shrink: 0; }
.ob-choice-title { font-size: 0.95rem; font-weight: 600; }
.ob-choice-desc { font-size: 0.8rem; color: var(--text-dim); margin-top: 2px; }

.ob-tips { display: flex; flex-direction: column; gap: 12px; margin-bottom: 28px; }
.ob-tip {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 14px; background: var(--card);
  border-radius: 10px; border: 1px solid var(--border);
}
.ob-tip-icon { font-size: 1.3rem; flex-shrink: 0; }
.ob-tip p { font-size: 0.9rem; color: var(--text); line-height: 1.5; }

.ob-cta {
  width: 100%; padding: 13px; font-size: 1rem;
  border-radius: 10px; margin-bottom: 8px;
}
.ob-back {
  width: 100%; font-size: 0.85rem; opacity: 0.7;
}

/* ═══════════════════════════════════════════════════════════
   STUDY MODE BUTTONS (on Study/Home panel)
   ═══════════════════════════════════════════════════════════ */
.study-mode-row {
  display: flex; gap: 12px; margin: 20px 0;
  flex-wrap: wrap;
}
.study-mode-btn {
  flex: 1; min-width: 120px;
  display: flex; align-items: center; gap: 12px;
  padding: 16px 14px; border-radius: 14px;
  border: 1.5px solid var(--border); background: var(--card);
  cursor: pointer; text-align: left; color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}
.study-mode-btn:hover { border-color: var(--accent); box-shadow: 0 4px 16px rgba(108,99,255,0.15); }
.study-mode-btn.primary { border-color: var(--accent); background: rgba(108,99,255,0.1); }
.study-mode-icon { font-size: 1.8rem; flex-shrink: 0; }
.study-mode-title { font-size: 0.95rem; font-weight: 600; }
.study-mode-desc { font-size: 0.75rem; color: var(--text-dim); margin-top: 2px; }

/* ═══════════════════════════════════════════════════════════
   WORDS PANEL SUB-TABS
   ═══════════════════════════════════════════════════════════ */
.words-subtabs {
  display: flex; gap: 0; margin-bottom: 16px;
  border-radius: 10px; overflow: hidden;
  border: 1px solid var(--border);
}
.words-subtab {
  flex: 1; padding: 9px 12px;
  border: none; cursor: pointer;
  font-size: 0.85rem; font-weight: 600;
  background: var(--surface); color: var(--text-dim);
  transition: background 0.2s, color 0.2s;
}
.words-subtab.active { background: var(--accent); color: #fff; }
.words-subtab:hover:not(.active) { background: var(--hover-bg); color: var(--text); }

/* Floating Add button */
.fab-add {
  position: fixed; bottom: 24px; right: 24px; z-index: 200;
  width: 52px; height: 52px; border-radius: 50%;
  background: var(--accent); color: #fff;
  font-size: 1.5rem; border: none; cursor: pointer;
  box-shadow: 0 4px 20px rgba(108,99,255,0.4);
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.15s, box-shadow 0.15s;
}
.fab-add:hover { transform: scale(1.1); box-shadow: 0 6px 24px rgba(108,99,255,0.5); }

/* ═══════════════════════════════════════════════════════════
   GRAMMAR REFERENCE (Progress tab)
   ═══════════════════════════════════════════════════════════ */
.grammar-ref-section {
  margin-bottom: 20px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.grammar-ref-row {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.grammar-ref-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 2px; }
.grammar-ref-desc { font-size: 0.8rem; color: var(--text-dim); }

/* ═══════════════════════════════════════════════════════════
   GRAMMAR BROWSER MODAL
   ═══════════════════════════════════════════════════════════ */
.gb-overlay {
  position: fixed; inset: 0; z-index: 8000;
  background: var(--overlay-bg);
  display: flex; align-items: flex-end; justify-content: center;
  animation: ob-fade-in 0.2s ease;
}
.gb-overlay.gb-fade-out { animation: ob-fade-out 0.25s ease forwards; }
@media (min-width: 600px) {
  .gb-overlay { align-items: center; padding: 20px; }
}

.gb-modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
  width: 100%; max-width: 640px;
  max-height: 90vh;
  display: flex; flex-direction: column;
  overflow: hidden;
  box-shadow: 0 -8px 40px var(--shadow-color);
  animation: gb-slide-up 0.3s ease;
}
@media (min-width: 600px) {
  .gb-modal { border-radius: var(--radius); max-height: 80vh; }
}
@keyframes gb-slide-up {
  from { transform: translateY(40px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.gb-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 20px 0; flex-shrink: 0;
}
.gb-title { font-size: 1.1rem; font-weight: 700; }
.gb-close {
  background: none; border: none; color: var(--text-dim);
  font-size: 1.1rem; cursor: pointer; padding: 4px 8px;
  border-radius: 6px; transition: background 0.15s;
}
.gb-close:hover { background: var(--hover-bg); }

.gb-search-row { padding: 12px 20px 0; flex-shrink: 0; }
.gb-search {
  width: 100%; padding: 10px 14px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; color: var(--text); font-size: 0.95rem;
}
.gb-search:focus { outline: none; border-color: var(--accent); }

.gb-tabs {
  display: flex; padding: 12px 20px 0; gap: 0;
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.gb-tab {
  padding: 8px 16px; font-size: 0.85rem; font-weight: 600;
  border: none; background: none; cursor: pointer;
  color: var(--text-dim); border-bottom: 2px solid transparent;
  margin-bottom: -1px; transition: color 0.15s, border-color 0.15s;
}
.gb-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.gb-content { flex: 1; overflow-y: auto; padding: 8px 0; }

.gb-list { display: flex; flex-direction: column; }
.gb-entry {
  display: flex; align-items: center; justify-content: space-between;
  padding: 13px 20px; cursor: pointer; border-bottom: 1px solid var(--border);
  transition: background 0.12s;
}
.gb-entry:hover { background: var(--hover-bg); }
.gb-entry-label { font-size: 0.9rem; color: var(--text); }
.gb-entry-arrow { color: var(--text-dim); font-size: 1.1rem; }
.gb-empty { padding: 32px 20px; text-align: center; color: var(--text-dim); font-size: 0.9rem; }

.gb-detail { padding: 16px 20px; overflow-y: auto; }
.gb-detail-back { margin-bottom: 16px; }
.gb-detail-title {
  font-size: 1rem; font-weight: 700; margin-bottom: 16px;
  padding-bottom: 12px; border-bottom: 1px solid var(--border);
}
.gb-detail-body {
  font-size: 0.9rem; line-height: 1.65; color: var(--text);
}
.gb-detail-body h4 { margin: 16px 0 8px; font-size: 0.95rem; color: var(--text); }
.gb-detail-body p { margin-bottom: 10px; }
.gb-detail-body table { width: 100%; border-collapse: collapse; margin: 10px 0; }
.gb-detail-body th, .gb-detail-body td {
  padding: 7px 10px; border: 1px solid var(--border); font-size: 0.85rem; text-align: left;
}
.gb-detail-body th { background: var(--card); font-weight: 600; }
.gb-detail-body .example {
  background: var(--card); border-radius: 8px; padding: 10px 12px;
  margin: 8px 0; border-left: 3px solid var(--accent);
}
.gb-detail-body .tip {
  background: rgba(108,99,255,0.08); border-radius: 8px; padding: 10px 12px;
  margin: 8px 0; border-left: 3px solid var(--accent); font-size: 0.85rem;
}
.gb-detail-body .grammar-word { color: var(--accent); font-weight: 600; }
.gb-detail-body .grammar-note { color: var(--text-dim); font-size: 0.85rem; }

/* ═══════════════════════════════════════════════════════════
   STUDY SESSION TIMER (#8)
   ═══════════════════════════════════════════════════════════ */
.study-timer {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.5px;
  padding: 4px 9px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  white-space: nowrap;
}

.session-time-display {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 10px;
}

/* ═══════════════════════════════════════════════════════════
   SEARCH & STUDY (#9)
   ═══════════════════════════════════════════════════════════ */
.study-search-wrap {
  position: relative;
  margin-bottom: 10px;
}
.study-search-input {
  width: 100%;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 0.9rem;
  box-sizing: border-box;
  transition: border-color 0.2s;
}
.study-search-input:focus {
  outline: none;
  border-color: var(--accent);
}
.study-search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0; right: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 24px var(--shadow-color);
  max-height: 260px;
  overflow-y: auto;
  z-index: 100;
  display: none;
}
.study-search-results.visible { display: block; }
.study-search-item {
  padding: 10px 14px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  transition: background 0.12s;
}
.study-search-item:last-child { border-bottom: none; }
.study-search-item:hover { background: var(--hover-bg); }
.study-search-src { font-weight: 600; color: var(--text); font-size: 0.9rem; flex-shrink: 0; }
.study-search-tgt { color: var(--text-dim); font-size: 0.85rem; text-align: right; }

/* ═══════════════════════════════════════════════════════════
   QUIZ DIFFICULTY FILTERS (#10)
   ═══════════════════════════════════════════════════════════ */
.quiz-filter-row {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 4px;
}
.quiz-filter-btn {
  padding: 7px 12px;
  border: 1.5px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text-dim);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  line-height: 1.2;
}
.quiz-filter-btn:hover { border-color: var(--accent); color: var(--text); }
.quiz-filter-btn.active {
  border-color: var(--accent);
  background: rgba(108,99,255,0.12);
  color: var(--accent);
}
.quiz-filter-count {
  font-size: 0.72rem;
  font-weight: 700;
  opacity: 0.75;
}
.quiz-filter-info {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}


/* ── #19 Marketplace categories ─────────────────────────── */
.mp-category-pills { display: flex; gap: 7px; flex-wrap: wrap; margin-bottom: 16px; }
.mp-cat-pill { padding: 4px 13px; border-radius: 20px; border: 1px solid var(--border); background: var(--surface); color: var(--text-dim); font-size: 0.8rem; cursor: pointer; transition: all 0.15s; }
.mp-cat-pill:hover { border-color: var(--accent); color: var(--accent); }
.mp-cat-pill.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.category-badge { display: inline-block; font-size: 0.72rem; padding: 2px 8px; border-radius: 10px; background: rgba(108,99,255,0.12); color: var(--accent); font-weight: 500; }

/* ── #20 Card images ─────────────────────────────────────── */
.card-image-wrapper { display: flex; justify-content: center; margin: 6px 0 2px; }
.card-image-wrapper img { max-width: 100%; max-height: 150px; border-radius: 10px; object-fit: contain; }
.word-item-thumb { width: 36px; height: 36px; border-radius: 6px; object-fit: cover; flex-shrink: 0; }

/* ── #21 Example sentence ────────────────────────────────── */
.card-example-section { font-size: 0.85rem; color: var(--text-dim); margin-top: 10px; background: var(--surface); border-radius: 8px; padding: 10px 14px; line-height: 1.55; border-left: 3px solid var(--accent); text-align: left; }
.card-example-section .ex-label { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; color: var(--accent); margin-bottom: 4px; }