/* ╔══════════════════════════════════════════════════════════════╗
   ║       MaraLyrics — Production CSS                          ║
   ║       Glass UI · Dark Mode · Soft Neon Accents             ║
   ╚══════════════════════════════════════════════════════════════╝ */

/* ─── CSS Variables ─────────────────────────────────────────── */
:root {
  /* Colors */
  --bg-primary:    #0a0e1a;
  --bg-secondary:  #111827;
  --bg-card:       rgba(17, 24, 39, 0.65);
  --bg-glass:      rgba(255, 255, 255, 0.04);
  --border-glass:  rgba(255, 255, 255, 0.08);

  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #64748b;

  --accent:         #8b5cf6;
  --accent-glow:    rgba(139, 92, 246, 0.35);
  --accent-light:   #a78bfa;
  --accent-dark:    #7c3aed;

  --neon-pink:      #ec4899;
  --neon-cyan:      #22d3ee;
  --neon-green:     #34d399;

  --success:  #10b981;
  --warning:  #f59e0b;
  --danger:   #ef4444;

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Typography */
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --text-xs:  0.75rem;
  --text-sm:  0.875rem;
  --text-base: 1rem;
  --text-lg:  1.125rem;
  --text-xl:  1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  /* Borders & Radius */
  --radius-sm:  0.375rem;
  --radius-md:  0.75rem;
  --radius-lg:  1rem;
  --radius-xl:  1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px var(--accent-glow);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Layout */
  --max-width: 1200px;
  --header-height: 64px;
}

/* ─── Reset & Base ──────────────────────────────────────────── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--accent);
}

img { max-width: 100%; display: block; }

/* ─── Background Gradient ───────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(139, 92, 246, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(236, 72, 153, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(34, 211, 238, 0.04) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* ─── Layout Container ──────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  position: relative;
  z-index: 1;
}

/* ─── Header ────────────────────────────────────────────────── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.header__logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  object-fit: contain;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header__nav-link {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.header__nav-link:hover,
.header__nav-link.active {
  color: var(--text-primary);
  background: var(--bg-glass);
}

/* ─── Hero Section ──────────────────────────────────────────── */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  text-align: center;
  position: relative;
}

.hero__title {
  font-size: clamp(var(--text-3xl), 5vw, var(--text-4xl));
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-light) 50%, var(--neon-pink) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  color: var(--text-secondary);
  font-size: var(--text-lg);
  max-width: 500px;
  margin: 0 auto var(--space-xl);
}

/* ─── Search Bar ────────────────────────────────────────────── */
.search {
  position: relative;
  max-width: 560px;
  margin: 0 auto;
}

.search__input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  padding-left: 48px;
  font-size: var(--text-base);
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(12px);
  outline: none;
  transition: all var(--transition-base);
}

.search__input::placeholder {
  color: var(--text-muted);
}

.search__input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow), var(--shadow-lg);
}

.search__icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 18px;
}

.search__clear {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 18px;
  padding: var(--space-xs);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  display: none;
}
.search__clear.visible { display: block; }
.search__clear:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

/* ─── Category Filters ──────────────────────────────────────── */
.categories {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin: var(--space-xl) 0;
}

.category-btn {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-sm);
  font-weight: 500;
  font-family: var(--font-sans);
  color: var(--text-secondary);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.category-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  background: rgba(139, 92, 246, 0.1);
}

.category-btn.active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

/* ─── Section Titles ────────────────────────────────────────── */
.section-title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-title__icon {
  font-size: var(--text-lg);
}

/* ─── Song Grid ─────────────────────────────────────────────── */
.song-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

/* ─── Song Card (Glass) ─────────────────────────────────────── */
.song-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: block;
}

.song-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--neon-pink), var(--neon-cyan));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.song-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139, 92, 246, 0.3);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(139, 92, 246, 0.1);
}

.song-card:hover::before {
  opacity: 1;
}

.song-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.song-card__artist {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.song-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.song-card__category {
  padding: 2px 8px;
  background: rgba(139, 92, 246, 0.15);
  color: var(--accent-light);
  border-radius: var(--radius-full);
  font-weight: 500;
}

.song-card__views {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ─── Song Detail Page ──────────────────────────────────────── */
.song-page {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.song-page__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-xl);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.song-page__back:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.song-page__header {
  margin-bottom: var(--space-xl);
}

.song-page__title {
  font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--text-primary), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.song-page__info {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.song-page__info-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.song-page__lyrics-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-2xl);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative;
}

.song-page__lyrics {
  font-family: 'Georgia', 'Noto Serif', 'Times New Roman', serif;
  font-size: 1.15rem;
  line-height: 2;
  white-space: pre-line;
  color: var(--text-primary);
  letter-spacing: 0.01em;
  font-style: normal;
  font-weight: 400;
}

.song-page__lyrics-card::before {
  content: '♪';
  position: absolute;
  top: -12px;
  left: 24px;
  font-size: 28px;
  background: linear-gradient(135deg, var(--accent), var(--neon-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Pagination ────────────────────────────────────────────── */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin: var(--space-2xl) 0;
}

.pagination__btn {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  font-weight: 500;
  font-family: var(--font-sans);
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination__btn:hover:not(:disabled) {
  color: var(--text-primary);
  border-color: var(--accent);
}

.pagination__btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination__btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.pagination__info {
  color: var(--text-muted);
  font-size: var(--text-sm);
  margin: 0 var(--space-sm);
}

/* ─── Skeleton / Shimmer Loading ────────────────────────────── */
.skeleton {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
}

.skeleton::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255,255,255,0.04) 50%,
    transparent 100%
  );
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.skeleton__line {
  height: 14px;
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
}
.skeleton__line--title {
  height: 20px;
  width: 70%;
  margin-bottom: var(--space-md);
}
.skeleton__line--short { width: 40%; }
.skeleton__line--medium { width: 60%; }

/* ─── Offline Badge ─────────────────────────────────────────── */
.offline-badge {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgba(239, 68, 68, 0.9);
  color: #fff;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  gap: var(--space-xs);
  animation: slideInUp 0.3s ease;
  box-shadow: var(--shadow-md);
}

.offline-badge.visible {
  display: flex;
}

@keyframes slideInUp {
  from { transform: translateY(20px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

/* ─── Empty / Error States ──────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  color: var(--text-muted);
}

.empty-state__icon {
  font-size: 48px;
  margin-bottom: var(--space-md);
  opacity: 0.4;
}

.empty-state__title {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.empty-state__text {
  font-size: var(--text-sm);
  max-width: 400px;
  margin: 0 auto;
}

/* ─── Footer ────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border-glass);
  padding: var(--space-xl) 0;
  text-align: center;
  color: var(--text-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-3xl);
}

.footer__heart {
  color: var(--neon-pink);
}

/* ─── Utilities ─────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

.fade-in {
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.stagger-enter {
  opacity: 0;
  transform: translateY(12px);
  animation: staggerIn 0.4s ease forwards;
}

@keyframes staggerIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ─── Responsive ────────────────────────────────────────────── */

/* Tablets */
@media (max-width: 768px) {
  .container { padding: 0 var(--space-md); }

  .hero { padding: var(--space-2xl) 0 var(--space-xl); }
  .hero__title { font-size: var(--text-3xl); }

  .song-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .song-page__lyrics-card {
    padding: var(--space-lg);
  }

  .song-page__lyrics {
    font-size: var(--text-base);
  }

  .header__nav-link {
    font-size: var(--text-xs);
    padding: var(--space-xs);
  }
}

/* Mobile */
@media (max-width: 480px) {
  :root {
    --header-height: 56px;
  }

  .hero__subtitle { font-size: var(--text-base); }

  .search__input {
    padding: var(--space-sm) var(--space-md);
    padding-left: 40px;
    font-size: var(--text-sm);
  }

  .categories { gap: var(--space-xs); }

  .category-btn {
    font-size: var(--text-xs);
    padding: 2px var(--space-sm);
  }

  .song-card {
    padding: var(--space-md);
  }

  .song-page {
    padding: var(--space-lg) var(--space-md);
  }

  .song-page__lyrics-card {
    padding: var(--space-md);
  }

  .song-page__title {
    font-size: var(--text-2xl);
  }

  .pagination__btn {
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--text-xs);
  }
}

/* Touch-friendly tap targets */
@media (pointer: coarse) {
  .song-card { min-height: 100px; }
  .category-btn { min-height: 36px; }
  .pagination__btn { min-height: 40px; min-width: 40px; }
}

/* ─── 404 Error Page ────────────────────────────────────────── */
.error-page {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}

.error-page__glow {
  position: absolute;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -60%);
  pointer-events: none;
  opacity: 0.5;
  animation: pulseGlow 3s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.3; transform: translate(-50%, -60%) scale(1); }
  50%      { opacity: 0.6; transform: translate(-50%, -60%) scale(1.1); }
}

.error-page__code {
  font-size: clamp(5rem, 15vw, 10rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
  background: linear-gradient(135deg, var(--accent) 0%, var(--neon-pink) 50%, var(--neon-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  z-index: 1;
  margin-bottom: var(--space-md);
}

.error-page__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  position: relative;
  z-index: 1;
}

.error-page__text {
  color: var(--text-secondary);
  font-size: var(--text-base);
  max-width: 420px;
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  position: relative;
  z-index: 1;
}

.error-page__actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.error-page__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-xl);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  border: none;
}

.error-page__btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: var(--shadow-glow);
}
.error-page__btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--accent-glow);
  color: #fff;
}

.error-page__btn--ghost {
  background: var(--bg-glass);
  color: var(--text-secondary);
  border: 1px solid var(--border-glass);
}
.error-page__btn--ghost:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  background: rgba(139, 92, 246, 0.1);
}

.error-page__notes {
  margin-top: var(--space-2xl);
  display: flex;
  gap: var(--space-lg);
  position: relative;
  z-index: 1;
}

.error-page__note {
  font-size: var(--text-2xl);
  opacity: 0.15;
  animation: floatNote 3s ease-in-out infinite;
}

@keyframes floatNote {
  0%, 100% { transform: translateY(0); opacity: 0.15; }
  50%      { transform: translateY(-12px); opacity: 0.3; }
}

/* ─── Print ─────────────────────────────────────────────────── */
@media print {
  body::before, .header, .footer, .search,
  .categories, .pagination, .offline-badge { display: none !important; }

  .song-page__lyrics-card {
    background: #fff;
    color: #000;
    border: 1px solid #ccc;
  }

  .song-page__title {
    -webkit-text-fill-color: #000;
    background: none;
  }
}