/* ==========================================================================
   LINGUASEARCH — UI/UX PRO MAX DESIGN SYSTEM (v35)
   Style: Swiss Minimalist Grid + High-Craft Light/Dark SaaS Workspace
   6 Curated Themes • WCAG AAA Contrast • Zero Hardcoded Low-Contrast Leaks
   ========================================================================== */

:root {
  /* Typography Scale & Fonts */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Spatial Geometry & Radiuses */
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Micro-Interaction Transitions */
  --ease-snappy: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-normal: 220ms;

  /* Universal Accent Text */
  --text-on-accent: #ffffff;
}

/* ==========================================================================
   THEME 1: ☀️ Sáng Năng Động (Daylight Studio — Default Crisp Light)
   ========================================================================== */
:root,
[data-theme="daylight"] {
  --bg-canvas: #eef2f6;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-surface-hover: #f1f5f9;
  --bg-surface-subtle: #f4f7fb;
  --bg-glass: rgba(255, 255, 255, 0.92);
  --bg-glass-card: rgba(255, 255, 255, 0.98);

  --border-subtle: #dbe3ee;
  --border-medium: #cbd5e1;
  --border-strong: #94a3b8;
  --border-glow: rgba(2, 132, 199, 0.22);

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #475569;
  --text-dim: #64748b;

  --accent-primary: #0284c7;
  --accent-primary-hover: #0369a1;
  --accent-primary-glow: rgba(2, 132, 199, 0.10);
  --accent-indigo: #4f46e5;
  --accent-emerald: #059669;
  --accent-emerald-glow: rgba(5, 150, 105, 0.10);
  --accent-amber: #d97706;
  --accent-amber-glow: rgba(217, 119, 6, 0.10);
  --accent-rose: #e11d48;
  --accent-highlight: #fef08a;

  /* High-Contrast Semantic Badges (Light Mode = Deep Ink on Soft Tint) */
  --badge-sky-bg: #e0f2fe;
  --badge-sky-text: #0369a1;
  --badge-sky-border: #bae6fd;

  --badge-emerald-bg: #d1fae5;
  --badge-emerald-text: #047857;
  --badge-emerald-border: #a7f3d0;

  --badge-amber-bg: #fef3c7;
  --badge-amber-text: #b45309;
  --badge-amber-border: #fde68a;

  --badge-purple-bg: #ede9fe;
  --badge-purple-text: #6d28d9;
  --badge-purple-border: #ddd6fe;

  --badge-rose-bg: #ffe4e6;
  --badge-rose-text: #be123c;
  --badge-rose-border: #fecdd3;

  --shadow-bento: 0 1px 3px rgba(15, 23, 42, 0.06), 0 6px 20px -4px rgba(15, 23, 42, 0.05);
  --shadow-bento-hover: 0 12px 28px -6px rgba(15, 23, 42, 0.10), 0 0 0 1px #0284c7;
  --shadow-modal: 0 24px 48px -12px rgba(15, 23, 42, 0.22), 0 0 0 1px #cbd5e1;
}

/* ==========================================================================
   THEME 2: 🌿 Bạc Hà Tươi (Mint Botanical — Fresh Light)
   ========================================================================== */
[data-theme="mint"] {
  --bg-canvas: #e6f5ed;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-surface-hover: #f0fdf4;
  --bg-surface-subtle: #f2fbf6;
  --bg-glass: rgba(255, 255, 255, 0.92);
  --bg-glass-card: rgba(255, 255, 255, 0.98);

  --border-subtle: #c6ebd7;
  --border-medium: #9adbb8;
  --border-strong: #52b788;
  --border-glow: rgba(5, 150, 105, 0.22);

  --text-primary: #063729;
  --text-secondary: #0f513d;
  --text-muted: #1b6b52;
  --text-dim: #3d856d;

  --accent-primary: #059669;
  --accent-primary-hover: #047857;
  --accent-primary-glow: rgba(5, 150, 105, 0.12);
  --accent-indigo: #0d9488;
  --accent-emerald: #059669;
  --accent-emerald-glow: rgba(5, 150, 105, 0.12);
  --accent-amber: #d97706;
  --accent-amber-glow: rgba(217, 119, 6, 0.12);
  --accent-rose: #e11d48;
  --accent-highlight: #fef08a;

  --badge-sky-bg: #d1fae5;
  --badge-sky-text: #047857;
  --badge-sky-border: #a7f3d0;

  --badge-emerald-bg: #dcfce7;
  --badge-emerald-text: #15803d;
  --badge-emerald-border: #86efac;

  --badge-amber-bg: #fef3c7;
  --badge-amber-text: #b45309;
  --badge-amber-border: #fde68a;

  --badge-purple-bg: #ccfbf1;
  --badge-purple-text: #0f766e;
  --badge-purple-border: #99f6e4;

  --badge-rose-bg: #ffe4e6;
  --badge-rose-text: #be123c;
  --badge-rose-border: #fecdd3;

  --shadow-bento: 0 1px 3px rgba(6, 55, 41, 0.06), 0 6px 20px -4px rgba(6, 55, 41, 0.05);
  --shadow-bento-hover: 0 12px 28px -6px rgba(6, 55, 41, 0.10), 0 0 0 1px #059669;
  --shadow-modal: 0 24px 48px -12px rgba(6, 55, 41, 0.22), 0 0 0 1px #9adbb8;
}

/* ==========================================================================
   THEME 3: 🍑 Cam San Hô (Warm Coral — Editorial Warm Light)
   ========================================================================== */
[data-theme="coral"] {
  --bg-canvas: #f9ebe0;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-surface-hover: #fff7ed;
  --bg-surface-subtle: #fdf5ef;
  --bg-glass: rgba(255, 255, 255, 0.92);
  --bg-glass-card: rgba(255, 255, 255, 0.98);

  --border-subtle: #edd5c3;
  --border-medium: #e0b89b;
  --border-strong: #c98f65;
  --border-glow: rgba(234, 88, 12, 0.22);

  --text-primary: #271206;
  --text-secondary: #4a2511;
  --text-muted: #6e3b1e;
  --text-dim: #8c583a;

  --accent-primary: #ea580c;
  --accent-primary-hover: #c2410c;
  --accent-primary-glow: rgba(234, 88, 12, 0.12);
  --accent-indigo: #7c3aed;
  --accent-emerald: #059669;
  --accent-emerald-glow: rgba(5, 150, 105, 0.10);
  --accent-amber: #d97706;
  --accent-amber-glow: rgba(217, 119, 6, 0.12);
  --accent-rose: #e11d48;
  --accent-highlight: #fde68a;

  --badge-sky-bg: #ffedd5;
  --badge-sky-text: #c2410c;
  --badge-sky-border: #fed7aa;

  --badge-emerald-bg: #d1fae5;
  --badge-emerald-text: #047857;
  --badge-emerald-border: #a7f3d0;

  --badge-amber-bg: #fef3c7;
  --badge-amber-text: #b45309;
  --badge-amber-border: #fde68a;

  --badge-purple-bg: #f3e8ff;
  --badge-purple-text: #6d28d9;
  --badge-purple-border: #ddd6fe;

  --badge-rose-bg: #ffe4e6;
  --badge-rose-text: #be123c;
  --badge-rose-border: #fecdd3;

  --shadow-bento: 0 1px 3px rgba(39, 18, 6, 0.06), 0 6px 20px -4px rgba(39, 18, 6, 0.05);
  --shadow-bento-hover: 0 12px 28px -6px rgba(39, 18, 6, 0.10), 0 0 0 1px #ea580c;
  --shadow-modal: 0 24px 48px -12px rgba(39, 18, 6, 0.22), 0 0 0 1px #e0b89b;
}

/* ==========================================================================
   THEME 4: 🌸 Tím Lavender (Royal Lilac — Creative Light)
   ========================================================================== */
[data-theme="lavender"] {
  --bg-canvas: #efe8f8;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-surface-hover: #f5f3ff;
  --bg-surface-subtle: #f7f4fc;
  --bg-glass: rgba(255, 255, 255, 0.92);
  --bg-glass-card: rgba(255, 255, 255, 0.98);

  --border-subtle: #dcd0ee;
  --border-medium: #c4b5fd;
  --border-strong: #a78bfa;
  --border-glow: rgba(124, 58, 237, 0.22);

  --text-primary: #1e1b4b;
  --text-secondary: #312e81;
  --text-muted: #4c1d95;
  --text-dim: #6d28d9;

  --accent-primary: #7c3aed;
  --accent-primary-hover: #6d28d9;
  --accent-primary-glow: rgba(124, 58, 237, 0.12);
  --accent-indigo: #4f46e5;
  --accent-emerald: #059669;
  --accent-emerald-glow: rgba(5, 150, 105, 0.10);
  --accent-amber: #d97706;
  --accent-amber-glow: rgba(217, 119, 6, 0.10);
  --accent-rose: #e11d48;
  --accent-highlight: #fef08a;

  --badge-sky-bg: #ede9fe;
  --badge-sky-text: #5b21b6;
  --badge-sky-border: #ddd6fe;

  --badge-emerald-bg: #d1fae5;
  --badge-emerald-text: #047857;
  --badge-emerald-border: #a7f3d0;

  --badge-amber-bg: #fef3c7;
  --badge-amber-text: #b45309;
  --badge-amber-border: #fde68a;

  --badge-purple-bg: #f3e8ff;
  --badge-purple-text: #6d28d9;
  --badge-purple-border: #d8b4fe;

  --badge-rose-bg: #ffe4e6;
  --badge-rose-text: #be123c;
  --badge-rose-border: #fecdd3;

  --shadow-bento: 0 1px 3px rgba(30, 27, 75, 0.06), 0 6px 20px -4px rgba(30, 27, 75, 0.05);
  --shadow-bento-hover: 0 12px 28px -6px rgba(30, 27, 75, 0.10), 0 0 0 1px #7c3aed;
  --shadow-modal: 0 24px 48px -12px rgba(30, 27, 75, 0.22), 0 0 0 1px #c4b5fd;
}

/* ==========================================================================
   THEME 5: 🌙 Tối Hiện Đại (Midnight Slate — Pro Dark)
   ========================================================================== */
[data-theme="midnight"] {
  --bg-canvas: #090d16;
  --bg-surface: #0f172a;
  --bg-surface-elevated: #151f32;
  --bg-surface-hover: #1e293b;
  --bg-surface-subtle: #0d1322;
  --bg-glass: rgba(15, 23, 42, 0.88);
  --bg-glass-card: rgba(21, 31, 50, 0.85);

  --border-subtle: rgba(255, 255, 255, 0.09);
  --border-medium: rgba(255, 255, 255, 0.16);
  --border-strong: rgba(255, 255, 255, 0.26);
  --border-glow: rgba(56, 189, 248, 0.35);

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-primary: #38bdf8;
  --accent-primary-hover: #0ea5e9;
  --accent-primary-glow: rgba(56, 189, 248, 0.16);
  --accent-indigo: #6366f1;
  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.16);
  --accent-amber: #f59e0b;
  --accent-amber-glow: rgba(245, 158, 11, 0.16);
  --accent-rose: #f43f5e;
  --accent-highlight: #fde047;

  --badge-sky-bg: rgba(56, 189, 248, 0.14);
  --badge-sky-text: #7dd3fc;
  --badge-sky-border: rgba(56, 189, 248, 0.32);

  --badge-emerald-bg: rgba(16, 185, 129, 0.14);
  --badge-emerald-text: #6ee7b7;
  --badge-emerald-border: rgba(16, 185, 129, 0.32);

  --badge-amber-bg: rgba(245, 158, 11, 0.15);
  --badge-amber-text: #fcd34d;
  --badge-amber-border: rgba(245, 158, 11, 0.35);

  --badge-purple-bg: rgba(139, 92, 246, 0.16);
  --badge-purple-text: #c4b5fd;
  --badge-purple-border: rgba(139, 92, 246, 0.35);

  --badge-rose-bg: rgba(244, 63, 94, 0.15);
  --badge-rose-text: #fda4af;
  --badge-rose-border: rgba(244, 63, 94, 0.35);

  --shadow-bento: 0 4px 20px -2px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  --shadow-bento-hover: 0 12px 30px -4px rgba(0, 0, 0, 0.65), 0 0 0 1px rgba(56, 189, 248, 0.4);
  --shadow-modal: 0 24px 60px -12px rgba(0, 0, 0, 0.85), 0 0 0 1px rgba(255, 255, 255, 0.15);
}

/* ==========================================================================
   THEME 6: 🖤 OLED Tối Giản (Pitch Black — High Contrast Dark)
   ========================================================================== */
[data-theme="oled"] {
  --bg-canvas: #000000;
  --bg-surface: #0a0a0a;
  --bg-surface-elevated: #121212;
  --bg-surface-hover: #1d1d1d;
  --bg-surface-subtle: #080808;
  --bg-glass: rgba(0, 0, 0, 0.92);
  --bg-glass-card: rgba(18, 18, 18, 0.92);

  --border-subtle: rgba(255, 255, 255, 0.14);
  --border-medium: rgba(255, 255, 255, 0.24);
  --border-strong: rgba(255, 255, 255, 0.38);
  --border-glow: rgba(56, 189, 248, 0.45);

  --text-primary: #ffffff;
  --text-secondary: #e5e5e5;
  --text-muted: #a3a3a3;
  --text-dim: #737373;

  --accent-primary: #38bdf8;
  --accent-primary-hover: #0ea5e9;
  --accent-primary-glow: rgba(56, 189, 248, 0.20);
  --accent-indigo: #818cf8;
  --accent-emerald: #34d399;
  --accent-emerald-glow: rgba(52, 211, 153, 0.20);
  --accent-amber: #fbbf24;
  --accent-amber-glow: rgba(251, 191, 36, 0.20);
  --accent-rose: #fb7185;
  --accent-highlight: #fde047;

  --badge-sky-bg: rgba(56, 189, 248, 0.16);
  --badge-sky-text: #7dd3fc;
  --badge-sky-border: rgba(56, 189, 248, 0.38);

  --badge-emerald-bg: rgba(52, 211, 153, 0.16);
  --badge-emerald-text: #6ee7b7;
  --badge-emerald-border: rgba(52, 211, 153, 0.38);

  --badge-amber-bg: rgba(251, 191, 36, 0.16);
  --badge-amber-text: #fde047;
  --badge-amber-border: rgba(251, 191, 36, 0.38);

  --badge-purple-bg: rgba(167, 139, 250, 0.18);
  --badge-purple-text: #ddd6fe;
  --badge-purple-border: rgba(167, 139, 250, 0.38);

  --badge-rose-bg: rgba(251, 113, 133, 0.16);
  --badge-rose-text: #fda4af;
  --badge-rose-border: rgba(251, 113, 133, 0.38);

  --shadow-bento: 0 4px 20px rgba(0, 0, 0, 0.85);
  --shadow-bento-hover: 0 8px 30px rgba(0, 0, 0, 0.95), 0 0 0 1px rgba(255, 255, 255, 0.28);
  --shadow-modal: 0 24px 60px rgba(0, 0, 0, 0.95), 0 0 0 1px rgba(255, 255, 255, 0.24);
}

/* Backward-Compatible Legacy Token Aliases (Used by idioms, admin, etc.) */
:root,
[data-theme] {
  --bg-color: var(--bg-canvas);
  --bg-card: var(--bg-surface-elevated);
  --card-bg: var(--bg-surface-elevated);
  --border-color: var(--border-subtle);
  --text-color: var(--text-primary);
  --text-main: var(--text-primary);
  --primary: var(--accent-primary);
  --primary-hover: var(--accent-primary-hover);
  --highlight-bg: var(--accent-highlight);
  --highlight-text: #0f172a;
  --danger: var(--accent-rose);
  --success: var(--accent-emerald);
}

/* ==========================================================================
   Global Reset & Swiss Layout Foundation
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 15px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--duration-normal) var(--ease-snappy),
              color var(--duration-normal) var(--ease-snappy);
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-canvas);
}
::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-snappy);
}
a:hover {
  color: var(--accent-primary-hover);
}

/* Keyword Highlight in Search Snippets (Required by E2E contract) */
.highlight,
mark.highlight {
  background-color: var(--badge-amber-bg);
  color: var(--badge-amber-text);
  font-weight: 800;
  padding: 0.08rem 0.38rem;
  border-radius: 5px;
  border: 1px solid var(--badge-amber-border);
}

/* ==========================================================================
   Header & Swiss Minimalist Topbar
   ========================================================================== */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.6rem 1.5rem;
}

.header-inner {
  max-width: 1320px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-primary);
  transition: transform var(--duration-fast) var(--ease-snappy);
}
.brand-logo:hover {
  transform: translateY(-1px);
}

.logo-mark {
  width: 36px;
  height: 36px;
  background: var(--accent-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 12px var(--accent-primary-glow);
}

.logo-text {
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 0;
}
.logo-text-bold {
  font-weight: 800;
  color: var(--text-primary);
}
.logo-text-accent {
  font-weight: 700;
  color: var(--accent-primary);
}

/* Navigation Segmented Controls */
.main-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.25rem;
}

.nav-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  padding: 0.42rem 0.9rem;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--duration-fast) var(--ease-snappy);
  white-space: nowrap;
}

.nav-tab:hover {
  color: var(--text-primary);
  background: var(--bg-surface-hover);
}

.nav-tab.active {
  color: var(--text-on-accent);
  background: var(--accent-primary);
  font-weight: 700;
  box-shadow: 0 2px 8px var(--accent-primary-glow);
}

.nav-tab-streak {
  color: var(--badge-amber-text);
}
.nav-tab-streak.active {
  background: var(--accent-amber);
  color: #ffffff;
}

.nav-pill-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: var(--badge-amber-bg);
  color: var(--badge-amber-text);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--badge-amber-border);
}
.nav-tab.active .nav-pill-badge {
  background: rgba(255, 255, 255, 0.22);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.35);
}

.streak-flame {
  display: inline-block;
}

/* Header Right Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.theme-selector-pill,
.lang-selector-pill {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-full);
  padding: 0.34rem 0.75rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  transition: all var(--duration-fast) var(--ease-snappy);
}
.theme-selector-pill:hover,
.theme-selector-pill:focus-within,
.lang-selector-pill:hover,
.lang-selector-pill:focus-within {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

.theme-pill-icon,
.lang-pill-icon {
  font-size: 0.9rem;
  line-height: 1;
}

.theme-selector-select,
.lang-selector-select {
  background: transparent;
  color: var(--text-primary);
  border: none;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  outline: none;
  appearance: none;
  padding-right: 1.1rem;
}
.theme-selector-select option,
.lang-selector-select option {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
}

.select-chevron {
  position: absolute;
  right: 0.6rem;
  pointer-events: none;
  color: var(--text-muted);
}

/* User Profile Badge */
.user-profile-menu {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-full);
  padding: 0.25rem 0.65rem 0.25rem 0.32rem;
}

.user-avatar {
  width: 26px;
  height: 26px;
  background: var(--accent-primary);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.76rem;
  font-weight: 800;
}

.user-email-text {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  max-width: 130px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-logout {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  padding: 0.22rem;
  border-radius: 6px;
  transition: all var(--duration-fast) var(--ease-snappy);
}
.btn-logout:hover {
  color: var(--badge-rose-text);
  background: var(--badge-rose-bg);
}

/* ==========================================================================
   Main Container & Bento Card Architecture
   ========================================================================== */
main.container {
  max-width: 1320px;
  width: 100%;
  margin: 1.5rem auto 2.5rem auto;
  padding: 0 1.5rem;
  flex: 1;
}

.card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  margin-bottom: 1.35rem;
  box-shadow: var(--shadow-bento);
  position: relative;
  transition: border-color var(--duration-normal) var(--ease-snappy),
              box-shadow var(--duration-normal) var(--ease-snappy);
}

/* ==========================================================================
   Hero Search Command Center (Minimalist SaaS Hero)
   ========================================================================== */
.hero-search-card {
  padding: 1.75rem 2rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-bento);
}

.hero-search-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.15rem;
}

.hero-title-group h1 {
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.25;
}

.hero-title-group p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.search-bar {
  display: flex;
  gap: 0.65rem;
  align-items: center;
  background: var(--bg-surface-subtle);
  border: 2px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 0.45rem 0.55rem 0.45rem 1.15rem;
  transition: all var(--duration-fast) var(--ease-snappy);
}

.search-bar:focus-within {
  background: var(--bg-surface-elevated);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px var(--accent-primary-glow);
}

.search-bar input[type="text"] {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1.08rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.search-bar input[type="text"]::placeholder {
  color: var(--text-dim);
  font-weight: 500;
  font-size: 0.96rem;
}

/* Quick Discovery Bar & Language Pills */
.search-discovery-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--border-subtle);
}

.quick-chips-group {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.quick-chips-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 0.2rem;
}

.dict-lang-pills-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.lang-pill-btn {
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.3rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snappy);
}
.lang-pill-btn:hover {
  color: var(--text-primary);
  background: var(--bg-surface-hover);
  border-color: var(--border-strong);
}
.lang-pill-btn.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
  font-weight: 700;
}

.quota-indicator {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* ==========================================================================
   Buttons System
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  background: var(--accent-primary);
  color: #ffffff;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: 0.65rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snappy);
  box-shadow: 0 2px 6px var(--accent-primary-glow);
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover {
  background: var(--accent-primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-primary-glow);
}

.btn:active {
  transform: scale(0.98);
}

.btn-secondary {
  background: var(--bg-surface-subtle);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  box-shadow: none;
}
.btn-secondary:hover {
  background: var(--bg-surface-hover);
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  box-shadow: none;
}

.btn-success {
  background: var(--accent-emerald);
  color: #ffffff;
  border: 1px solid transparent;
}
.btn-success:hover {
  filter: brightness(0.95);
  color: #ffffff;
}

.btn-google-login {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.42rem 0.95rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
  transition: all var(--duration-fast) var(--ease-snappy);
}
.btn-google-login:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-1px);
}

.btn-tool {
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-full);
  padding: 0.32rem 0.8rem;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snappy);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.btn-tool:hover {
  background: var(--bg-surface-hover);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-1px);
}

/* ==========================================================================
   Studio Split Stage (Video Top-Left + Karaoke Text Top-Right) & Horizon List
   ========================================================================== */
.player-split-stage {
  padding: 1.35rem;
}

.player-top-split-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 1.35rem;
  align-items: stretch;
}

@media (max-width: 980px) {
  .player-top-split-grid {
    grid-template-columns: 1fr;
  }
}

.player-top-left-col {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
}

.player-top-right-col {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.playlist-header-title {
  font-size: 0.96rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.playlist-count-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.16rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--badge-sky-bg);
  color: var(--badge-sky-text);
  border: 1px solid var(--badge-sky-border);
}

/* ==========================================================================
   Feature A: Multi-Language Dictionary Bento Box
   ========================================================================== */
.dictionary-card {
  border-left: 4px solid var(--accent-emerald);
  background: var(--bg-surface-elevated);
}

.dictionary-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.dict-mode-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--badge-emerald-text);
  background: var(--badge-emerald-bg);
  border: 1px solid var(--badge-emerald-border);
  padding: 0.24rem 0.65rem;
  border-radius: var(--radius-xs);
}

.dict-lang-badge {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--badge-sky-text);
  background: var(--badge-sky-bg);
  border: 1px solid var(--badge-sky-border);
  padding: 0.24rem 0.75rem;
  border-radius: var(--radius-full);
}

.dict-main-row {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.dict-headword-group {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.dict-query-title {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.dict-ipa {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--badge-amber-text);
  background: var(--badge-amber-bg);
  padding: 0.18rem 0.6rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--badge-amber-border);
}

.dict-pos-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--badge-purple-text);
  background: var(--badge-purple-bg);
  border: 1px solid var(--badge-purple-border);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-xs);
}

.dict-meaning-box {
  font-size: 1.12rem;
  color: var(--text-primary);
  background: var(--badge-emerald-bg);
  border: 1px solid var(--badge-emerald-border);
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-md);
  line-height: 1.5;
}

.dict-meaning-flag {
  color: var(--badge-emerald-text);
  font-size: 0.9rem;
  font-weight: 700;
  margin-right: 0.4rem;
}

.dict-en-def {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.dict-usage-note {
  margin-top: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  background: var(--bg-surface-subtle);
  padding: 0.65rem 0.95rem;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent-primary);
}

.dict-sub-section {
  margin-top: 1.1rem;
  padding-top: 0.95rem;
  border-top: 1px solid var(--border-subtle);
}

.dict-sub-title {
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
}

.dict-chips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(195px, 1fr));
  gap: 0.65rem;
}

.dict-word-chip {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snappy);
}
.dict-word-chip:hover {
  border-color: var(--accent-primary);
  background: var(--bg-surface-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-bento);
}

.dict-word-chip.chunk-highlight {
  border-color: var(--badge-amber-border);
  background: var(--badge-amber-bg);
}

.chip-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.35rem;
  margin-bottom: 0.25rem;
}

.chip-word {
  font-weight: 800;
  color: var(--accent-primary);
  font-size: 0.95rem;
}

.chip-ipa {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--badge-amber-text);
}

.chip-pos {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
}

.chip-meaning {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.dict-collocations-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.collocation-pill {
  background: var(--badge-emerald-bg) !important;
  border-color: var(--badge-emerald-border) !important;
  color: var(--badge-emerald-text) !important;
  font-weight: 700 !important;
}

/* ==========================================================================
   Paraphrase & Tone Clusters Bento Grid
   ========================================================================== */
.intent-section {
  border-left: 4px solid var(--accent-indigo);
}

.intent-header {
  margin-bottom: 1rem;
}

.intent-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--badge-purple-text);
  background: var(--badge-purple-bg);
  border: 1px solid var(--badge-purple-border);
  padding: 0.22rem 0.65rem;
  border-radius: var(--radius-xs);
  display: inline-block;
  margin-bottom: 0.45rem;
}

.intent-cluster-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.2rem;
}

.intent-cluster-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.intent-groups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.intent-tone-card {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
}

.intent-tone-card.tone-casual { border-top: 3px solid var(--accent-emerald); }
.intent-tone-card.tone-neutral { border-top: 3px solid var(--accent-primary); }
.intent-tone-card.tone-formal { border-top: 3px solid var(--accent-indigo); }

.tone-header {
  margin-bottom: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.tone-header strong {
  font-size: 0.95rem;
  color: var(--text-primary);
}
.tone-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.tone-phrase-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  flex: 1;
}

.tone-phrase-item {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  transition: all var(--duration-fast) var(--ease-snappy);
}
.tone-phrase-item:hover {
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}
.tone-phrase-item.current-matched {
  background: var(--badge-sky-bg);
  border: 1px solid var(--accent-primary);
}

.tone-phrase-row {
  margin-bottom: 0.22rem;
}

.btn-intent-phrase {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
  padding: 0;
  text-align: left;
}
.btn-intent-phrase:hover .phrase-text {
  color: var(--accent-primary);
  text-decoration: underline;
}

.phrase-hits {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--badge-sky-bg);
  color: var(--badge-sky-text);
  padding: 0.12rem 0.45rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--badge-sky-border);
}

.tone-phrase-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.35;
}

/* ==========================================================================
   Video Player Section & Synchronized Karaoke Caption Studio
   ========================================================================== */
.player-section {
  padding: 1.25rem;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-bento);
}

.video-player-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #090d16;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-medium);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.18);
}

#yt-player-frame, #yt-player-frame iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.video-click-shield {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  cursor: pointer;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-state-badge {
  background: rgba(15, 23, 42, 0.88);
  backdrop-filter: blur(8px);
  color: #ffffff;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.92rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  pointer-events: none;
}

.video-overlay-caption {
  position: absolute;
  bottom: 1rem;
  left: 4%;
  right: 4%;
  z-index: 20;
  pointer-events: none;
  text-align: center;
}

#overlay-caption-text {
  display: inline-block;
  background: rgba(9, 13, 22, 0.88);
  backdrop-filter: blur(6px);
  color: #ffffff;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.4;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

/* Custom Player Control Bar */
.player-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.95rem;
  padding: 0.7rem 0.85rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.custom-transport-group {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.custom-transport-btn {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  padding: 0.45rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 700;
}
.custom-transport-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.btn-play-pause {
  background: var(--accent-primary) !important;
  color: #ffffff !important;
  border-color: var(--accent-primary) !important;
  font-weight: 700;
  min-width: 92px;
}
.btn-play-pause:hover {
  background: var(--accent-primary-hover) !important;
  color: #ffffff !important;
}

.player-time-badge {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--badge-sky-text);
  background: var(--badge-sky-bg);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--badge-sky-border);
}

.custom-secondary-group {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

/* Learning Caption Box (Karaoke-style Voice Sync) */
.learning-caption-box {
  margin-top: 0.95rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
}

.karaoke-studio-panel {
  margin-top: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.65rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.3rem;
}

.caption-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.caption-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--badge-sky-text);
  background: var(--badge-sky-bg);
  border: 1px solid var(--badge-sky-border);
  padding: 0.18rem 0.55rem;
  border-radius: var(--radius-xs);
  letter-spacing: 0.03em;
}

.caption-tools {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-tool-translate {
  border-color: var(--accent-primary) !important;
  color: var(--accent-primary) !important;
  font-weight: 700 !important;
}

/* Karaoke Lyrics & Synchronized Voice Runner */
.caption-body {
  font-size: 1.28rem;
  font-weight: 600;
  line-height: 1.85;
  color: var(--text-secondary);
  min-height: 52px;
  padding: 0.5rem 0.15rem;
  cursor: pointer;
  user-select: text;
}

.karaoke-stage-body {
  flex: 1;
  min-height: 155px;
  max-height: 270px;
  overflow-y: auto;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.05rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  align-content: flex-start;
  box-shadow: inset 0 1px 3px rgba(15, 23, 42, 0.04);
}

.caption-word {
  display: inline-block;
  padding: 0.12rem 0.32rem;
  margin: 0.08rem 0.1rem;
  border-radius: 6px;
  color: var(--text-secondary);
  font-weight: 600;
  transition: all 0.12s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.caption-word:hover {
  background: var(--badge-sky-bg) !important;
  color: var(--badge-sky-text) !important;
  transform: translateY(-1px);
}

.caption-word.voice-active {
  background: var(--accent-primary) !important;
  color: #ffffff !important;
  font-weight: 700;
  transform: scale(1.06);
  box-shadow: 0 2px 8px var(--accent-primary-glow);
}

.caption-word.voice-passed {
  color: var(--text-primary);
  font-weight: 600;
}

.caption-word.target-word {
  color: var(--badge-amber-text);
  background: var(--badge-amber-bg);
  border: 1px solid var(--badge-amber-border);
  font-weight: 800;
}

.caption-word.target-word.word-active {
  background: #f59e0b !important;
  color: #ffffff !important;
  border-color: #d97706 !important;
  font-weight: 900;
  transform: scale(1.1);
  box-shadow: 0 2px 12px rgba(245, 158, 11, 0.45);
}

.learning-highlight {
  background: transparent;
  color: inherit;
  font-weight: inherit;
  padding: 0;
  border-radius: 4px;
}

#overlay-caption-text .caption-word {
  color: #e2e8f0;
}
#overlay-caption-text .caption-word.voice-active {
  background: #0284c7 !important;
  color: #ffffff !important;
  font-weight: 800;
  border-radius: 4px;
}
#overlay-caption-text .caption-word.target-word {
  color: #fde047;
  background: transparent;
  border: none;
  text-decoration: underline;
}
#overlay-caption-text .caption-word.target-word.word-active {
  background: #f59e0b !important;
  color: #000000 !important;
  font-weight: 900;
  border-radius: 4px;
  text-decoration: none;
}

.subtitle-translation-box {
  margin-top: 0.4rem;
  padding: 0.75rem 0.95rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-left: 3px solid var(--accent-primary);
  border-radius: var(--radius-md);
  max-height: 185px;
  overflow-y: auto;
}

.subtitle-trans-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.35rem;
}

.subtitle-trans-meaning {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
}

.caption-progress-track {
  width: 100%;
  height: 6px;
  background: var(--border-subtle);
  border-radius: var(--radius-full);
  margin-top: 0.35rem;
  overflow: hidden;
}

.caption-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-indigo));
  transition: width 0.15s linear;
}

/* ==========================================================================
   Horizon List View (Horizontal Scrollable Video Clips Carousel)
   ========================================================================== */
.horizon-playlist-card {
  padding: 1.15rem 1.35rem;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-bento);
}

.horizon-playlist-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--border-subtle);
}

.horizon-header-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.horizon-drag-hint {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
}

.horizon-header-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.horizon-arrow-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-subtle);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snappy);
}

.horizon-arrow-btn:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  transform: translateY(-1px);
  box-shadow: 0 3px 8px var(--accent-primary-glow);
}

.horizon-viewport-wrap {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.horizon-float-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 15;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-float);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 800;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snappy);
  opacity: 0.92;
}

.horizon-float-arrow.left {
  left: -10px;
}

.horizon-float-arrow.right {
  right: -10px;
}

.horizon-float-arrow:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  transform: translateY(-50%) scale(1.08);
  opacity: 1;
}

@media (max-width: 768px) {
  .horizon-float-arrow {
    display: none;
  }
}

/* Search Result Cards (Vertical Fallback + Horizon List View Track) */
.search-results {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.search-results.horizon-results-track {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 1rem;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-behavior: smooth;
  scroll-snap-type: x proximity;
  cursor: grab;
  user-select: none;
  padding: 0.35rem 0.35rem 0.85rem 0.35rem;
  width: 100%;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.search-results.horizon-results-track::-webkit-scrollbar {
  height: 7px;
}

.search-results.horizon-results-track::-webkit-scrollbar-track {
  background: var(--bg-surface-subtle);
  border-radius: var(--radius-full);
}

.search-results.horizon-results-track::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-full);
}

.search-results.horizon-results-track::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

.search-results.horizon-results-track.is-dragging {
  cursor: grabbing;
  scroll-behavior: auto;
  scroll-snap-type: none;
}

.result-card {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.05rem 1.2rem;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snappy);
  position: relative;
  box-shadow: var(--shadow-bento);
}

.horizon-results-track .result-card {
  flex: 0 0 250px;
  width: 250px;
  max-width: 78vw;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 0.55rem;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snappy);
  position: relative;
  box-shadow: var(--shadow-bento);
}

.horizon-results-track > .card {
  flex: 1 1 100%;
  min-width: 100%;
}

.result-card:hover {
  border-color: var(--accent-primary);
  background: var(--bg-surface-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-bento-hover);
}

.result-card.active-card {
  border: 2px solid var(--accent-primary);
  background: var(--bg-surface-elevated);
  box-shadow: var(--shadow-bento-hover);
}

/* Video Thumbnail Display */
.result-thumb-box {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #090d16;
  border: 1px solid var(--border-subtle);
}

.result-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.22s var(--ease-snappy);
}

.result-thumb-badge {
  position: absolute;
  top: 0.4rem;
  left: 0.4rem;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(4px);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-xs);
  border: 1px solid rgba(255, 255, 255, 0.2);
  pointer-events: none;
  z-index: 2;
}

.result-thumb-play {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.35);
  color: #ffffff;
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-snappy);
  z-index: 3;
}

.result-thumb-play svg {
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.55));
  transform: scale(0.9);
  transition: transform var(--duration-fast) var(--ease-snappy);
}

.horizon-results-track .result-card:hover .result-thumb-img {
  transform: scale(1.04);
}

.horizon-results-track .result-card:hover .result-thumb-play {
  opacity: 1;
}

.horizon-results-track .result-card:hover .result-thumb-play svg {
  transform: scale(1.1);
}

.horizon-results-track .result-card:hover .result-title-box {
  color: var(--accent-primary);
}

.horizon-results-track .result-card.active-card .result-thumb-badge {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
}

.horizon-results-track .result-card.active-card .result-thumb-play {
  opacity: 1;
  background: rgba(15, 23, 42, 0.15);
}

.horizon-results-track .result-card.active-card .result-thumb-play svg {
  color: var(--accent-primary);
}

/* Video Title Box (Fixed 2 lines with ellipsis, no snippet text) */
.result-title-box {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  height: calc(1.35em * 2);
  min-height: calc(1.35em * 2);
  max-height: calc(1.35em * 2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  word-break: break-word;
  margin-top: 0.5rem;
  padding: 0 0.15rem;
  transition: color var(--duration-fast) var(--ease-snappy);
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.55rem;
}

.result-header span {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.result-snippet {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.55;
  background: var(--bg-surface-elevated);
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

/* ==========================================================================
   Feature B: Daily 5-Minute Workout & Curated Goal Tracks (/daily)
   ========================================================================== */
.daily-hero-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  background: var(--bg-surface-elevated);
  border-left: 4px solid var(--accent-amber);
}

.daily-hero-left {
  flex: 1;
  min-width: 280px;
}

.daily-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--badge-amber-text);
  background: var(--badge-amber-bg);
  border: 1px solid var(--badge-amber-border);
  padding: 0.22rem 0.65rem;
  border-radius: var(--radius-full);
}

.daily-hero-title {
  margin: 0.55rem 0 0.35rem 0;
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.daily-hero-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

.daily-hero-stats {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.streak-stat-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-medium);
  padding: 0.75rem 1.15rem;
  border-radius: var(--radius-lg);
}

.streak-icon {
  font-size: 1.75rem;
}

.streak-number {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--badge-amber-text);
}

.streak-label {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-muted);
}

.daily-workout-container {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.workout-step-card {
  border-left: 4px solid var(--accent-primary);
}
.workout-step-card.step-card-done {
  border-left-color: var(--accent-emerald);
}

.workout-step-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.15rem;
}

.step-title-group {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}
.step-title-group h3 {
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--text-primary);
}

.step-number-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  background: var(--accent-primary);
  color: #ffffff;
  padding: 0.22rem 0.6rem;
  border-radius: var(--radius-xs);
}

.step-status-pill {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
}
.step-status-pill.completed {
  background: var(--badge-emerald-bg);
  color: var(--badge-emerald-text);
  border: 1px solid var(--badge-emerald-border);
}

.pod-highlight-box {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.35rem;
  margin-bottom: 1.15rem;
}

.pod-phrase-title {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--accent-primary);
  letter-spacing: -0.02em;
}

.pod-meaning-text {
  margin-top: 0.45rem;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
}

.pod-context-note {
  margin-top: 0.35rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.daily-player-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.25rem;
}
@media (max-width: 860px) {
  .daily-player-grid {
    grid-template-columns: 1fr;
  }
}

.daily-active-caption {
  margin-top: 0.65rem;
  padding: 0.75rem 0.95rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  color: var(--text-primary);
}

.pod-clips-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.pod-clip-card {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 0.95rem;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snappy);
}
.pod-clip-card:hover,
.pod-clip-card.active {
  border-color: var(--accent-primary);
  background: var(--badge-sky-bg);
}

.pod-clip-title {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--accent-primary);
  margin-bottom: 0.22rem;
}
.pod-clip-quote {
  font-size: 0.84rem;
  color: var(--text-secondary);
  font-style: italic;
}

.daily-cloze-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.15rem;
}

.cloze-question-card {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.15rem;
}

.cloze-sentence-box {
  font-size: 1rem;
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 0.85rem;
  line-height: 1.6;
}

.cloze-options-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.goal-tracks-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.goal-track-tab {
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 0.6rem 1.1rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  transition: all var(--duration-fast) var(--ease-snappy);
}
.goal-track-tab:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}
.goal-track-tab.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
}

.track-header-banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  padding: 1.1rem 1.3rem;
  border-radius: var(--radius-lg);
}

.track-phrases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.85rem;
}

.track-phrase-card {
  display: block;
  text-decoration: none;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  transition: all var(--duration-fast) var(--ease-snappy);
}
.track-phrase-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-bento);
}

.track-phrase-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.35rem;
}

.track-phrase-en {
  font-weight: 800;
  font-size: 1rem;
  color: var(--accent-primary);
}

.track-phrase-ipa {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--badge-amber-text);
}

.track-phrase-meaning {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.track-videos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.85rem;
}

.track-video-card {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.95rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.75rem;
}

.track-video-title {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text-primary);
  line-height: 1.45;
}

.track-video-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Idioms Hub Cards & Filters (/idioms)
   ========================================================================== */
.idioms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1.15rem;
}
@media (max-width: 640px) {
  .idioms-grid {
    grid-template-columns: 1fr;
  }
}

.idiom-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.85rem;
  box-shadow: var(--shadow-bento);
  transition: all var(--duration-fast) var(--ease-snappy);
}
.idiom-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-bento-hover);
}

.idiom-example-box {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: 0.75rem 0.95rem;
  font-size: 0.9rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.btn-category-pill {
  padding: 0.48rem 0.95rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-medium);
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  transition: all var(--duration-fast) var(--ease-snappy);
}
.btn-category-pill:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}
.btn-category-pill.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
}

/* ==========================================================================
   Modals, Alerts & Form Inputs
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 580px;
  box-shadow: var(--shadow-modal);
  padding: 1.75rem;
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.85rem;
  margin-bottom: 1.25rem;
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}
.modal-close-btn:hover {
  color: var(--text-primary);
}

.modal-input {
  width: 100%;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.9rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  outline: none;
}
.modal-input:focus {
  border-color: var(--accent-primary);
  background: var(--bg-surface-elevated);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

.error-box {
  display: none;
  background: var(--badge-rose-bg);
  border: 1px solid var(--badge-rose-border);
  color: var(--badge-rose-text);
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  margin: 1rem 0;
}

.alert-box {
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
}
.alert-success {
  background: var(--badge-emerald-bg);
  border: 1px solid var(--badge-emerald-border);
  color: var(--badge-emerald-text);
}

/* ==========================================================================
   Tabs System, Phrasebook & Lessons Workspace
   ========================================================================== */
.tabs-nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.35rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.6rem;
}

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 700;
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snappy);
}
.tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-surface-hover);
}
.tab-btn.active {
  color: #ffffff;
  background: var(--accent-primary);
}

.phrase-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-bento);
  transition: all var(--duration-fast) var(--ease-snappy);
}
.phrase-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.srs-flashcard {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-bento);
  text-align: center;
}

.srs-grade-bar {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-grade {
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
  border: none;
  min-width: 125px;
  color: #ffffff;
}
.btn-again { background: #dc2626; }
.btn-hard { background: #d97706; }
.btn-good { background: #059669; }
.btn-easy { background: #0284c7; }

.tag-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-xs);
  text-transform: uppercase;
}
.tag-daily {
  background: var(--badge-sky-bg);
  color: var(--badge-sky-text);
  border: 1px solid var(--badge-sky-border);
}
.tag-work {
  background: var(--badge-purple-bg);
  color: var(--badge-purple-text);
  border: 1px solid var(--badge-purple-border);
}
.tag-presentation {
  background: var(--badge-amber-bg);
  color: var(--badge-amber-text);
  border: 1px solid var(--badge-amber-border);
}
.tag-academic {
  background: var(--badge-emerald-bg);
  color: var(--badge-emerald-text);
  border: 1px solid var(--badge-emerald-border);
}

.lesson-workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}
@media (max-width: 900px) {
  .lesson-workspace {
    grid-template-columns: 1fr;
  }
}

.cloze-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.cloze-input {
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xs);
  padding: 0.35rem 0.6rem;
  color: var(--accent-primary);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  margin: 0 0.25rem;
  width: 140px;
  text-align: center;
  outline: none;
}
.cloze-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--accent-primary-glow);
}
.cloze-input.correct {
  border-color: var(--badge-emerald-border);
  background: var(--badge-emerald-bg);
  color: var(--badge-emerald-text);
}
.cloze-input.incorrect {
  border-color: var(--badge-rose-border);
  background: var(--badge-rose-bg);
  color: var(--badge-rose-text);
}

.vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.vocab-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.quiz-option-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
  cursor: pointer;
  color: var(--text-primary);
  font-weight: 500;
}
.quiz-option-label:hover {
  border-color: var(--accent-primary);
  background: var(--bg-surface-hover);
}
.quiz-option-label.selected {
  border-color: var(--accent-primary);
  background: var(--badge-sky-bg);
  color: var(--badge-sky-text);
  font-weight: 700;
}
.quiz-option-label.is-correct {
  border-color: var(--badge-emerald-border);
  background: var(--badge-emerald-bg);
  color: var(--badge-emerald-text);
}
.quiz-option-label.is-incorrect {
  border-color: var(--badge-rose-border);
  background: var(--badge-rose-bg);
  color: var(--badge-rose-text);
}

/* ==========================================================================
   Footer & Responsive
   ========================================================================== */
.app-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated);
  padding: 1.35rem 1.5rem;
  margin-top: auto;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-inner {
  max-width: 1320px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.footer-dot {
  width: 7px;
  height: 7px;
  background: var(--accent-emerald);
  border-radius: 50%;
}

@media (max-width: 768px) {
  .app-header {
    padding: 0.6rem 1rem;
  }
  .header-inner {
    flex-wrap: wrap;
  }
  .main-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    justify-content: flex-start;
  }
  main.container {
    padding: 0 1rem;
  }
}