/* ==========================================================================
   AeroCode Flight Intelligence - Interactive Aviation Learning Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;600;700;900&family=Outfit:wght@400;500;600;700;800&family=JetBrains+Mono:wght@500;700&display=swap');

:root {
  --bg-main: #070a12;
  --bg-surface: rgba(14, 21, 37, 0.75);
  --bg-surface-elevated: rgba(22, 33, 58, 0.85);
  --bg-card: rgba(17, 26, 46, 0.7);
  --bg-card-hover: rgba(26, 40, 72, 0.85);

  --border-subtle: rgba(148, 163, 184, 0.12);
  --border-glow: rgba(56, 189, 248, 0.35);
  --border-focus: #38bdf8;

  --cyan-primary: #38bdf8;
  --cyan-glow: rgba(56, 189, 248, 0.25);
  --blue-vibrant: #2563eb;
  --gold-accent: #fbbf24;
  --gold-glow: rgba(251, 191, 36, 0.25);
  --emerald-success: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.25);
  --rose-danger: #f43f5e;
  --rose-glow: rgba(244, 63, 94, 0.25);
  --purple-accent: #a855f7;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-cyan: #7dd3fc;

  --font-main: 'Noto Sans TC', 'Outfit', system-ui, -apple-system, sans-serif;
  --font-code: 'JetBrains Mono', 'Outfit', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.15);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Theme Variables & Component Overrides */
body.theme-light {
  --bg-main: #f1f5f9;
  --bg-surface: rgba(255, 255, 255, 0.9);
  --bg-surface-elevated: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;

  --border-subtle: #cbd5e1;
  --border-glow: rgba(2, 132, 199, 0.35);
  --border-focus: #0284c7;

  --cyan-primary: #0284c7;
  --cyan-glow: rgba(2, 132, 199, 0.15);
  --blue-vibrant: #1d4ed8;
  --gold-accent: #d97706;
  --gold-glow: rgba(217, 119, 6, 0.15);
  --emerald-success: #059669;
  --emerald-glow: rgba(5, 150, 105, 0.15);
  --rose-danger: #e11d48;
  --rose-glow: rgba(225, 29, 72, 0.15);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-cyan: #0369a1;

  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 15px rgba(2, 132, 199, 0.12);
}

body.theme-light .aero-background {
  opacity: 0.15;
}

/* Light Mode: Big Title & Headers */
body.theme-light .brand-title h1 {
  background: linear-gradient(90deg, #0f172a 45%, var(--cyan-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.theme-light .config-header h2 {
  background: linear-gradient(90deg, #0f172a 35%, var(--cyan-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Light Mode: Category Navigation & Buttons */
body.theme-light .category-nav {
  background: #e2e8f0;
  border-color: #cbd5e1;
}

body.theme-light .cat-btn {
  color: #475569;
}

body.theme-light .cat-btn:hover {
  color: #0f172a;
}

body.theme-light .cat-btn.active {
  background: #ffffff;
  color: var(--cyan-primary);
  border: 1.5px solid rgba(2, 132, 199, 0.4);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

body.theme-light .cat-badge {
  background: rgba(2, 132, 199, 0.12);
  color: var(--cyan-primary);
}

/* Light Mode: Mode Navigation & Buttons */
body.theme-light .mode-nav {
  background: #e2e8f0;
  border-color: #cbd5e1;
}

body.theme-light .mode-btn {
  color: #475569;
}

body.theme-light .mode-btn:hover {
  color: #0f172a;
}

body.theme-light .mode-btn.active {
  background: linear-gradient(135deg, var(--cyan-primary), #0284c7);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.35);
}

/* Light Mode: Search Bar & View Toggles */
body.theme-light .search-input {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

body.theme-light .search-input::placeholder {
  color: #94a3b8;
}

body.theme-light .search-input:focus {
  background: #ffffff;
  border-color: var(--cyan-primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

body.theme-light .view-toggles {
  background: #e2e8f0;
  border-color: #cbd5e1;
}

body.theme-light .view-btn {
  color: #475569;
}

body.theme-light .view-btn.active {
  background: #ffffff;
  color: var(--cyan-primary);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

/* Light Mode: Filter Chips */
body.theme-light .chip-btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #334155;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

body.theme-light .chip-btn:hover {
  border-color: var(--cyan-primary);
  color: var(--cyan-primary);
  background: #f8fafc;
}

body.theme-light .chip-btn.active {
  background: rgba(2, 132, 199, 0.12);
  border-color: var(--cyan-primary);
  color: var(--cyan-primary);
  font-weight: 700;
}

body.theme-light .chip-btn.special-chip {
  background: #fffbeb;
  border-color: #fde68a;
  color: #b45309;
}

body.theme-light .chip-btn.special-chip:hover {
  border-color: #f59e0b;
}

body.theme-light .chip-btn.special-chip.active {
  background: #fef3c7;
  border-color: #d97706;
  color: #92400e;
  box-shadow: 0 1px 4px rgba(217, 119, 6, 0.15);
}

/* Light Mode: Cards & Components */
body.theme-light .airline-logo-box {
  background: #ffffff;
  border-color: #e2e8f0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

body.theme-light .airline-code-badge {
  background: rgba(2, 132, 199, 0.08);
  border-color: rgba(2, 132, 199, 0.3);
  color: var(--cyan-primary);
}

body.theme-light .codes-dual-display {
  background: #f1f5f9;
  border-color: #e2e8f0;
}

body.theme-light .detail-row {
  background: #f8fafc;
  border-color: #e2e8f0;
}

body.theme-light .country-pill {
  background: #e2e8f0;
  color: #334155;
}

body.theme-light .diff-alert-badge {
  background: #fef3c7;
  border-color: #fde68a;
  color: #b45309;
}

body.theme-light .btn-speak-pill {
  background: rgba(2, 132, 199, 0.08);
  border-color: rgba(2, 132, 199, 0.3);
  color: var(--cyan-primary);
}

body.theme-light .btn-speak-pill:hover {
  background: rgba(2, 132, 199, 0.18);
  border-color: var(--cyan-primary);
}

body.theme-light .tag-remark {
  background: #f3e8ff;
  color: #7e22ce;
}

body.theme-light .icon-btn:hover {
  background: #e2e8f0;
  color: #0f172a;
}

body.theme-light .ctrl-btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #475569;
}

body.theme-light .ctrl-btn:hover {
  background: #f8fafc;
  border-color: var(--cyan-primary);
  color: #0f172a;
}

body.theme-light .ctrl-btn.active {
  background: rgba(2, 132, 199, 0.1);
  border-color: var(--cyan-primary);
  color: var(--cyan-primary);
}

/* Light Mode: Data Table */
body.theme-light .aero-table th {
  background: #f1f5f9;
  color: #334155;
  border-bottom-color: #cbd5e1;
}

body.theme-light .aero-table td {
  border-bottom-color: #e2e8f0;
  color: #0f172a;
}

body.theme-light .aero-table tr:hover td {
  background: rgba(2, 132, 199, 0.04);
}

body.theme-light .table-code-pill {
  background: rgba(2, 132, 199, 0.1);
  color: var(--cyan-primary);
}

body.theme-light .table-code-pill.diff-pill {
  background: #fef3c7;
  color: #b45309;
}

body.theme-light .table-logo-img {
  border: 1px solid #e2e8f0;
}

/* Light Mode: Quiz Screen */
body.theme-light .mode-radio-card {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.theme-light .mode-radio-card:hover {
  border-color: var(--cyan-primary);
  background: #f8fafc;
}

body.theme-light .mode-radio-card.selected {
  background: rgba(2, 132, 199, 0.08);
  border-color: var(--cyan-primary);
  box-shadow: 0 0 15px rgba(2, 132, 199, 0.15);
}

body.theme-light .quiz-hud-bar {
  background: #ffffff;
  border-color: #e2e8f0;
}

body.theme-light .question-card {
  background: #ffffff;
  border-color: #e2e8f0;
}

body.theme-light .option-btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}

body.theme-light .option-btn:hover:not(.disabled) {
  background: #f8fafc;
  border-color: var(--cyan-primary);
}

body.theme-light .option-btn.correct {
  background: #dcfce7 !important;
  border-color: #10b981 !important;
  color: #065f46 !important;
}

body.theme-light .option-btn.correct .option-key {
  background: #10b981;
  color: #ffffff;
}

body.theme-light .option-btn.incorrect {
  background: #ffe4e6 !important;
  border-color: #f43f5e !important;
  color: #9f1239 !important;
}

body.theme-light .option-btn.incorrect .option-key {
  background: #f43f5e;
  color: #ffffff;
}

body.theme-light .btn-start-quiz {
  color: #ffffff;
  background: linear-gradient(135deg, var(--cyan-primary), #0369a1);
  box-shadow: 0 4px 18px rgba(2, 132, 199, 0.35);
}

body.theme-light .btn-start-quiz:hover {
  box-shadow: 0 6px 24px rgba(2, 132, 199, 0.45);
}

body.theme-light .btn-next-question {
  color: #ffffff;
  background: linear-gradient(135deg, var(--cyan-primary), #0369a1);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}

body.theme-light .btn-next-question:hover {
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.45);
}

body.theme-light .cat-btn:not(.active) .cat-badge {
  background: #cbd5e1;
  color: #475569;
}

body.theme-light .icon-btn {
  color: #64748b;
}

body.theme-light .icon-btn:hover {
  background: #e2e8f0;
  color: #0284c7;
}

body.theme-light .icon-btn.active-star {
  color: #d97706;
}

body.theme-light .option-key {
  background: #f1f5f9;
  color: #475569;
}

body.theme-light .option-logo {
  border: 1px solid #e2e8f0;
}

body.theme-light .q-type-pill {
  background: rgba(2, 132, 199, 0.1);
  border-color: rgba(2, 132, 199, 0.3);
  color: var(--cyan-primary);
}

body.theme-light .question-code-main {
  color: var(--cyan-primary);
  text-shadow: none;
}

body.theme-light .combo-flame-badge {
  background: #fef3c7;
  border-color: #fde68a;
  color: #b45309;
}

body.theme-light .quiz-progress-track {
  background: #e2e8f0;
}

body.theme-light .feedback-card {
  background: #ffffff;
  border-color: rgba(2, 132, 199, 0.4);
}

body.theme-light .res-stat-box {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.theme-light .btn-secondary {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}

body.theme-light .btn-secondary:hover {
  background: #f8fafc;
  border-color: var(--cyan-primary);
}

body.theme-light .mistake-item {
  background: #ffffff;
  border: 1px solid #fecdd3;
}

/* Light Mode: Flashcards */
body.theme-light .flashcard-front,
body.theme-light .flashcard-back {
  background: #ffffff;
  border-color: #cbd5e1;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}


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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Background Aero Radar Grid & Ambient Glow */
.aero-background {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.radar-glow-1 {
  position: absolute;
  top: -15%;
  left: 20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
  filter: blur(80px);
  animation: floatOrb 18s ease-in-out infinite alternate;
}

.radar-glow-2 {
  position: absolute;
  bottom: 10%;
  right: -5%;
  width: 550px;
  height: 550px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.09) 0%, transparent 70%);
  filter: blur(90px);
  animation: floatOrb 22s ease-in-out infinite alternate-reverse;
}

.radar-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(56, 189, 248, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.1); }
  100% { transform: translate(-30px, 40px) scale(0.95); }
}

/* App Container */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 1380px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Header & HUD Navbar */
.app-header {
  background: var(--bg-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.75rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

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

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand-icon {
  width: 46px;
  height: 46px;
  background: linear-gradient(135deg, var(--cyan-primary), #1d4ed8);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.4);
  animation: pulseIcon 4s infinite ease-in-out;
}

@keyframes pulseIcon {
  0%, 100% { box-shadow: 0 4px 16px rgba(56, 189, 248, 0.4); }
  50% { box-shadow: 0 4px 26px rgba(56, 189, 248, 0.7); }
}

.brand-title h1 {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #ffffff 40%, var(--cyan-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.ctrl-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

.ctrl-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-glow);
  transform: translateY(-1px);
}

.ctrl-btn.active {
  color: var(--cyan-primary);
  border-color: var(--cyan-primary);
  background: rgba(56, 189, 248, 0.1);
}

/* Category Switcher (Airline vs City/Airport) */
.category-switch-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-subtle);
}

.category-nav {
  display: flex;
  background: rgba(8, 13, 24, 0.6);
  padding: 0.35rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  gap: 0.25rem;
}

.cat-btn {
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: var(--transition-fast);
}

.cat-btn:hover {
  color: var(--text-primary);
}

.cat-btn.active {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  color: var(--cyan-primary);
  border: 1px solid var(--border-glow);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

.cat-badge {
  background: rgba(56, 189, 248, 0.15);
  color: var(--cyan-primary);
  font-size: 0.75rem;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  font-family: var(--font-code);
}

/* Mode Switcher Tabs (Display vs Quiz vs Flashcards) */
.mode-nav {
  display: flex;
  background: rgba(8, 13, 24, 0.6);
  padding: 0.35rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  gap: 0.25rem;
}

.mode-btn {
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.mode-btn:hover {
  color: var(--text-primary);
}

.mode-btn.active {
  background: linear-gradient(135deg, var(--cyan-primary), #0284c7);
  color: #040814;
  font-weight: 700;
  box-shadow: 0 2px 14px rgba(56, 189, 248, 0.4);
}

/* ==========================================================================
   DISPLAY MODE SECTION
   ========================================================================== */
.display-toolbar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.search-and-view {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.search-input-box {
  flex: 1;
  min-width: 260px;
  position: relative;
}

.search-icon {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
  pointer-events: none;
}

.search-input {
  width: 100%;
  background: rgba(8, 13, 24, 0.7);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 0.95rem;
  padding: 0.75rem 2.8rem 0.75rem 2.9rem;
  border-radius: var(--radius-full);
  outline: none;
  transition: var(--transition-fast);
}

.search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 16px var(--cyan-glow);
  background: rgba(14, 21, 37, 0.9);
}

.search-clear {
  position: absolute;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  display: none;
}

.search-clear:hover {
  color: var(--text-primary);
}

.view-toggles {
  display: flex;
  background: rgba(8, 13, 24, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.25rem;
}

.view-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.55rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition-fast);
}

.view-btn.active {
  background: rgba(56, 189, 248, 0.2);
  color: var(--cyan-primary);
  font-weight: 600;
}

/* Filter Chips Bar */
.filter-chips-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  scrollbar-width: thin;
}

.chip-btn {
  background: rgba(14, 21, 37, 0.7);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-fast);
}

.chip-btn:hover {
  border-color: var(--border-glow);
  color: var(--text-primary);
}

.chip-btn.active {
  background: rgba(56, 189, 248, 0.18);
  border-color: var(--cyan-primary);
  color: var(--cyan-primary);
  font-weight: 600;
}

.chip-btn.special-chip {
  border-color: rgba(251, 191, 36, 0.4);
  color: var(--gold-accent);
}

.chip-btn.special-chip.active {
  background: rgba(251, 191, 36, 0.18);
  border-color: var(--gold-accent);
}

.filter-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.count-highlight {
  color: var(--cyan-primary);
  font-weight: 700;
}

/* Airline Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.25rem;
}

/* Card Styles */
.airline-card, .city-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-card);
}

.airline-card:hover, .city-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5), var(--shadow-glow);
}

.card-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.airline-code-badge {
  font-family: var(--font-code);
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--cyan-primary);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 0.2rem 0.85rem;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  box-shadow: inset 0 0 10px rgba(56, 189, 248, 0.1);
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition-fast);
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.icon-btn.active-star {
  color: var(--gold-accent);
}

.card-main-content {
  display: flex;
  align-items: center;
  gap: 1.15rem;
}

/* Airline Logo Styling */
.airline-logo-box {
  width: 68px;
  height: 68px;
  min-width: 68px;
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
  position: relative;
  overflow: hidden;
}

.airline-logo-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.airline-card:hover .airline-logo-img {
  transform: scale(1.08);
}

.airline-logo-fallback {
  width: 100%;
  height: 100%;
  border-radius: 8px;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-code);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--cyan-primary);
}

.airline-info-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.airline-name-zh {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.airline-name-en {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.3;
}

/* City / Airport Card Details */
.city-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.country-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
}

.flag-emoji {
  font-size: 1.1rem;
}

.diff-alert-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  background: rgba(251, 191, 36, 0.15);
  border: 1px solid rgba(251, 191, 36, 0.4);
  color: var(--gold-accent);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  animation: pulseBadge 3s infinite;
}

@keyframes pulseBadge {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.codes-dual-display {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  background: rgba(8, 13, 24, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
}

.code-col {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.code-col-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.code-col-value {
  font-family: var(--font-code);
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.city-code-color {
  color: var(--cyan-primary);
}

.airport-code-color {
  color: #34d399;
}

.airport-code-highlight {
  color: var(--gold-accent);
}

.city-detail-names {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.detail-row {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  background: rgba(8, 13, 24, 0.35);
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(148, 163, 184, 0.08);
}

.detail-row-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.2rem;
}

.detail-row-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.btn-speak-pill {
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--cyan-primary);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: var(--transition-fast);
}

.btn-speak-pill:hover {
  background: rgba(56, 189, 248, 0.25);
  border-color: var(--cyan-primary);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(56, 189, 248, 0.25);
}

.btn-speak-pill:active {
  transform: scale(0.96);
}

.detail-row-zh {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.detail-row-en {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.card-footer-tags {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.75rem;
  font-size: 0.78rem;
}

.tag-region {
  color: var(--text-muted);
}

.tag-remark {
  background: rgba(168, 85, 247, 0.15);
  color: #d8b4fe;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* Data Table View */
.table-container {
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  box-shadow: var(--shadow-card);
}

.aero-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.aero-table th {
  background: rgba(15, 23, 42, 0.95);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.aero-table td {
  padding: 0.95rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
  vertical-align: middle;
}

.aero-table tr:hover td {
  background: rgba(56, 189, 248, 0.05);
}

.table-logo-cell {
  width: 54px;
}

.table-logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  background: #ffffff;
  border-radius: var(--radius-sm);
  padding: 3px;
}

.table-code-pill {
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 1.1rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.12);
  color: var(--cyan-primary);
  display: inline-block;
}

.table-code-pill.diff-pill {
  background: rgba(251, 191, 36, 0.15);
  color: var(--gold-accent);
}

/* ==========================================================================
   INTERACTIVE QUIZ MODE SECTION
   ========================================================================== */
.quiz-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Quiz Config View */
.quiz-config-card {
  background: var(--bg-surface);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-card);
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.config-header {
  text-align: center;
}

.config-header h2 {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(90deg, #ffffff, var(--cyan-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
}

.config-header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.config-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.config-label {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.config-options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.85rem;
}

.mode-radio-card {
  position: relative;
  background: rgba(14, 21, 37, 0.65);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.mode-radio-card:hover {
  border-color: var(--border-glow);
  background: rgba(22, 33, 58, 0.85);
}

.mode-radio-card input {
  position: absolute;
  opacity: 0;
}

.mode-radio-card.selected {
  border-color: var(--cyan-primary);
  background: rgba(56, 189, 248, 0.12);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.2);
}

.radio-icon-box {
  font-size: 1.5rem;
}

.radio-text-box h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.radio-text-box p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.btn-start-quiz {
  background: linear-gradient(135deg, var(--cyan-primary), #0284c7);
  color: #040814;
  font-size: 1.15rem;
  font-weight: 800;
  border: none;
  padding: 1.1rem 2.5rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin: 0.5rem auto 0;
  box-shadow: 0 4px 25px rgba(56, 189, 248, 0.4);
  transition: var(--transition-smooth);
}

.btn-start-quiz:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 32px rgba(56, 189, 248, 0.6);
}

/* Active Quiz Container */
.quiz-active-container {
  max-width: 820px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Quiz Top Stats Bar */
.quiz-hud-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1rem 1.5rem;
  gap: 1rem;
}

.hud-stat {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
}

.hud-stat-label {
  color: var(--text-muted);
}

.hud-stat-val {
  font-family: var(--font-code);
  font-weight: 800;
  color: var(--text-primary);
}

.combo-flame-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(251, 191, 36, 0.15);
  border: 1px solid rgba(251, 191, 36, 0.4);
  color: var(--gold-accent);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  font-family: var(--font-code);
  font-weight: 800;
  animation: pulseFlame 1.5s infinite;
}

@keyframes pulseFlame {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

/* Progress bar */
.quiz-progress-track {
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-primary), #34d399);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

/* Question Visual Stage */
.question-card {
  background: var(--bg-surface);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  gap: 1.25rem;
}

.q-type-pill {
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.15);
  color: var(--cyan-primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Prominent Airline Logo in Question (Requirement!) */
.question-airline-logo {
  width: 90px;
  height: 90px;
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.question-airline-logo img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.question-text-main {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.question-code-main {
  font-family: var(--font-code);
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--cyan-primary);
  letter-spacing: 0.08em;
  text-shadow: 0 0 30px rgba(56, 189, 248, 0.4);
}

.question-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

/* Options 4-Choice Grid */
.options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.option-btn {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.4rem;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 1rem;
  text-align: left;
  transition: var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.option-btn:hover:not(.disabled) {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.option-key {
  width: 32px;
  height: 32px;
  min-width: 32px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.option-logo {
  width: 44px;
  height: 44px;
  min-width: 44px;
  background: #ffffff;
  border-radius: var(--radius-sm);
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.option-logo img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.option-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.option-text-primary {
  font-size: 1.15rem;
  font-weight: 700;
}

.option-code-style {
  font-family: var(--font-code);
  font-size: 1.5rem;
  letter-spacing: 0.05em;
  color: var(--cyan-primary);
}

.option-text-sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Option States on Feedback */
.option-btn.correct {
  background: rgba(16, 185, 129, 0.25) !important;
  border-color: var(--emerald-success) !important;
  color: #ffffff;
  box-shadow: 0 0 25px var(--emerald-glow);
}

.option-btn.correct .option-key {
  background: var(--emerald-success);
  color: #040814;
}

.option-btn.incorrect {
  background: rgba(244, 63, 94, 0.25) !important;
  border-color: var(--rose-danger) !important;
  box-shadow: 0 0 25px var(--rose-glow);
  animation: shakeBtn 0.4s ease;
}

.option-btn.incorrect .option-key {
  background: var(--rose-danger);
  color: #ffffff;
}

@keyframes shakeBtn {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.option-btn.disabled {
  pointer-events: none;
  opacity: 0.7;
}

/* Feedback Drawer / Explanation */
.feedback-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 1.35rem 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.feedback-info {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.feedback-icon-large {
  font-size: 2.2rem;
}

.feedback-text h4 {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 0.2rem;
}

.feedback-text p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.btn-next-question {
  background: linear-gradient(135deg, var(--cyan-primary), #0284c7);
  color: #040814;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.4);
}

.btn-next-question:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(56, 189, 248, 0.6);
}

/* Quiz Completion & Results Screen */
.quiz-results-card {
  background: var(--bg-surface);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
  max-width: 820px;
  margin: 0 auto;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.results-hero h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.score-big-circle {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  border: 6px solid var(--cyan-primary);
  margin: 1.5rem auto 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 35px var(--cyan-glow);
}

.score-percent {
  font-family: var(--font-code);
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--text-primary);
}

.score-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.results-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.res-stat-box {
  background: rgba(14, 21, 37, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.res-stat-val {
  font-family: var(--font-code);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--cyan-primary);
}

.res-stat-lbl {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.mistakes-review-box {
  background: rgba(244, 63, 94, 0.08);
  border: 1px solid rgba(244, 63, 94, 0.25);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: left;
}

.mistakes-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
}

.mistakes-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-height: 240px;
  overflow-y: auto;
}

.mistake-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(14, 21, 37, 0.75);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

.results-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
}

/* ==========================================================================
   FLASHCARD MODE SECTION (BONUS LEARNING TOOL)
   ========================================================================== */
.flashcard-section {
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.flashcard-container {
  width: 100%;
  height: 380px;
  perspective: 1000px;
  cursor: pointer;
}

.flashcard-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

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

.flashcard-front, .flashcard-back {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border-subtle);
  background: var(--bg-surface);
  backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
  gap: 1rem;
}

.flashcard-back {
  transform: rotateY(180deg);
  background: var(--bg-surface-elevated);
  border-color: var(--border-glow);
}

.flashcard-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  justify-content: center;
}

/* Responsive Media Queries */
@media (max-width: 768px) {
  .app-container {
    padding: 1rem 0.75rem 3rem;
  }
  .options-grid {
    grid-template-columns: 1fr;
  }
  .codes-dual-display {
    grid-template-columns: 1fr;
  }
  .results-stats-row {
    grid-template-columns: 1fr;
  }
  .header-top {
    flex-direction: column;
    align-items: flex-start;
  }
  .question-text-main {
    font-size: 1.75rem;
  }
  .question-code-main {
    font-size: 2.6rem;
  }
}

/* App Footer & Copyright */
.app-footer {
  margin-top: 3.5rem;
  padding: 2rem 1.5rem;
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.footer-copyright {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.03em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.footer-subtext {
  font-size: 0.85rem;
  color: var(--text-muted);
}