/* =========================================
   YT Video Downloader — Premium Design System
   ========================================= */

/* ---------- 1. Design Tokens ---------- */
:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #0f0f2a;
  --bg-tertiary: #161638;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-input: rgba(255, 255, 255, 0.06);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-hover: rgba(255, 255, 255, 0.15);

  --accent-cyan: #00d4ff;
  --accent-emerald: #00e676;
  --accent-purple: #7c3aed;
  --accent-pink: #ff6b9d;
  --accent-gradient: linear-gradient(135deg, #00d4ff, #00e676);
  --accent-gradient-reverse: linear-gradient(135deg, #00e676, #00d4ff);
  --hero-gradient: linear-gradient(135deg, #0a1628 0%, #0d1f3c 25%, #0a2540 50%, #062a3e 75%, #0a1628 100%);

  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.4);
  --text-accent: #00d4ff;

  --success: #00e676;
  --error: #ff5252;
  --warning: #ffab00;

  --q-4k: #ffd700;
  --q-1080: #00e676;
  --q-720: #00d4ff;
  --q-480: #7c3aed;
  --q-360: rgba(255, 255, 255, 0.35);
  --q-audio: #ff6b9d;

  --yt-red: #FF0000;
  --ig-pink: #E4405F;
  --tt-teal: #00f2ea;
  --fb-blue: #1877F2;
  --pin-red: #E60023;
  --rd-orange: #FF4500;
  --tw-black: #ffffff;
  --th-black: #ffffff;
  --dm-blue: #0066DC;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow-cyan: 0 0 30px rgba(0, 212, 255, 0.2);
  --shadow-glow-green: 0 0 30px rgba(0, 230, 118, 0.2);

  --transition-fast: 150ms ease;
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---------- 2. Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input { font-family: inherit; border: none; outline: none; background: none; }
ul, ol { list-style: none; }

/* ---------- 3. Typography ---------- */
h1, h2, h3, h4, h5 {
  font-family: 'Outfit', 'Inter', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--space-md);
}

.section-title .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-3xl);
  line-height: 1.7;
}

/* ---------- 4. Layout ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-4xl) 0;
  position: relative;
}

.section-alt { background: var(--bg-secondary); }

.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-md);
}

.hidden { display: none !important; }

/* ---------- 5. Header & Navigation ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
  transition: background var(--transition-base);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--text-primary) !important;
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon svg { width: 20px; height: 20px; color: #0a0a1a; }

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

.nav-link {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--text-secondary) !important;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
  text-decoration: none;
  white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary) !important;
  background: rgba(255, 255, 255, 0.06);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 1px;
}

/* Dropdown */
.nav-dropdown { position: relative; }

.nav-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-dropdown-trigger svg {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown-trigger svg { transform: rotate(180deg); }

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 200px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-lg);
}

.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--text-secondary) !important;
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}

.nav-dropdown-menu a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary) !important;
}

/* Mobile Menu */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  z-index: 110;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 26, 0.97);
  backdrop-filter: blur(20px);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.mobile-nav.active { display: flex; }

.mobile-nav a {
  font-size: 1.25rem;
  color: var(--text-secondary) !important;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.mobile-nav a:hover, .mobile-nav a.active {
  color: var(--text-primary) !important;
  background: rgba(255, 255, 255, 0.06);
}

/* ---------- 6. Hero Section ---------- */
.hero {
  position: relative;
  padding: calc(70px + var(--space-4xl)) 0 var(--space-4xl);
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--hero-gradient);
  background-size: 300% 300%;
  animation: gradientShift 12s ease infinite;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(0, 212, 255, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(0, 230, 118, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(124, 58, 237, 0.08) 0%, transparent 50%);
}

.hero .container { position: relative; z-index: 1; text-align: center; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-bottom: var(--space-lg);
  font-weight: 500;
}

.hero-badge .pulse-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-emerald);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

.hero-title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 800;
  margin-bottom: var(--space-md);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.7;
}

/* ---------- 7. Search Bar ---------- */
.search-container {
  max-width: 720px;
  margin: 0 auto;
}

.search-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  background: rgba(255, 255, 255, 0.07);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.search-bar:focus-within {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow-cyan), var(--shadow-md);
}

.search-input {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  font-size: 1rem;
  color: var(--text-primary);
  background: transparent;
  min-width: 0;
}

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

.search-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: var(--accent-gradient);
  border-radius: calc(var(--radius-xl) - 4px);
  color: #0a0a1a;
  font-weight: 700;
  font-size: 1rem;
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.search-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.search-btn:hover::before { opacity: 1; }
.search-btn:hover { transform: scale(1.02); box-shadow: var(--shadow-glow-green); }
.search-btn:active { transform: scale(0.98); }

.search-btn svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.search-btn.loading { pointer-events: none; opacity: 0.8; }

.search-btn .spinner-icon {
  animation: spin 1s linear infinite;
}

.search-hint {
  text-align: center;
  margin-top: var(--space-md);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- 8. Results Section ---------- */
.results-section {
  padding: var(--space-2xl) 0;
  animation: fadeInUp 0.5s ease;
}

.result-card {
  padding: var(--space-xl);
  display: flex;
  gap: var(--space-xl);
  align-items: flex-start;
}

.result-thumbnail {
  width: 280px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
}

.result-thumbnail img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

.result-thumbnail .duration {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-sm);
  background: rgba(0, 0, 0, 0.8);
  padding: 2px var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
}

.result-info { flex: 1; min-width: 0; }

.result-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.result-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

.result-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.options-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.quality-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.quality-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  background: var(--bg-card);
}

.quality-pill:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.quality-pill .pill-format {
  font-size: 0.7rem;
  opacity: 0.6;
  text-transform: uppercase;
}

/* Pill Variants */
.quality-pill.primary {
  background: var(--accent-gradient);
  border: none;
  color: #000;
}
.quality-pill.primary:hover {
  opacity: 0.9;
}
.quality-pill.primary svg {
  color: #000;
}

.quality-pill.audio {
  border-color: #ff3366;
  color: #ff3366;
}
.quality-pill.audio:hover {
  background: rgba(255, 51, 102, 0.1);
}

.quality-pill.muted {
  opacity: 0.6;
  filter: grayscale(1);
  font-size: 0.75rem;
  padding: 6px 12px;
}
.quality-pill.muted:hover {
  opacity: 1;
}

/* Advanced Options Accordion */
details.advanced-options {
  margin-top: var(--space-md);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.02);
  transition: all var(--transition-base);
}
details.advanced-options summary {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  list-style: none;
  display: flex;
  align-items: center;
  color: var(--text-muted);
}
details.advanced-options summary::-webkit-details-marker { display: none; }
details.advanced-options summary:hover { color: var(--text-primary); }
details.advanced-options[open] summary { border-bottom: 1px solid var(--border-glass); }
details.advanced-options .advanced-content {
  padding: var(--space-md);
}

.quality-pill[data-quality="2160"] { border-color: var(--q-4k); color: var(--q-4k); }
.quality-pill[data-quality="2160"]:hover { background: rgba(255, 215, 0, 0.15); box-shadow: 0 0 15px rgba(255, 215, 0, 0.2); }
.quality-pill[data-quality="1080"] { border-color: var(--q-1080); color: var(--q-1080); }
.quality-pill[data-quality="1080"]:hover { background: rgba(0, 230, 118, 0.15); box-shadow: 0 0 15px rgba(0, 230, 118, 0.2); }
.quality-pill[data-quality="720"] { border-color: var(--q-720); color: var(--q-720); }
.quality-pill[data-quality="720"]:hover { background: rgba(0, 212, 255, 0.15); box-shadow: 0 0 15px rgba(0, 212, 255, 0.2); }
.quality-pill[data-quality="480"] { border-color: var(--q-480); color: var(--q-480); }
.quality-pill[data-quality="480"]:hover { background: rgba(124, 58, 237, 0.15); }
.quality-pill[data-quality="360"] { border-color: var(--q-360); color: var(--q-360); }
.quality-pill[data-quality="audio"] { border-color: var(--q-audio); color: var(--q-audio); }
.quality-pill[data-quality="audio"]:hover { background: rgba(255, 107, 157, 0.15); box-shadow: 0 0 15px rgba(255, 107, 157, 0.2); }

/* ---------- 9. Platform Grid ---------- */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: var(--space-lg);
  max-width: 800px;
  margin: 0 auto;
}

.platform-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-md);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  text-decoration: none;
  color: var(--text-secondary) !important;
}

.platform-item:hover {
  background: var(--bg-card);
  transform: translateY(-4px);
  color: var(--text-primary) !important;
}

.platform-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
}

.platform-icon svg { width: 28px; height: 28px; transition: all var(--transition-base); }

.platform-item:hover .platform-icon { border-color: transparent; }

.platform-item[data-platform="youtube"]:hover .platform-icon { background: rgba(255, 0, 0, 0.15); box-shadow: 0 0 20px rgba(255, 0, 0, 0.2); }
.platform-item[data-platform="youtube"]:hover .platform-icon svg { color: var(--yt-red); }
.platform-item[data-platform="instagram"]:hover .platform-icon { background: rgba(228, 64, 95, 0.15); box-shadow: 0 0 20px rgba(228, 64, 95, 0.2); }
.platform-item[data-platform="instagram"]:hover .platform-icon svg { color: var(--ig-pink); }
.platform-item[data-platform="tiktok"]:hover .platform-icon { background: rgba(0, 242, 234, 0.15); box-shadow: 0 0 20px rgba(0, 242, 234, 0.2); }
.platform-item[data-platform="tiktok"]:hover .platform-icon svg { color: var(--tt-teal); }
.platform-item[data-platform="facebook"]:hover .platform-icon { background: rgba(24, 119, 242, 0.15); box-shadow: 0 0 20px rgba(24, 119, 242, 0.2); }
.platform-item[data-platform="facebook"]:hover .platform-icon svg { color: var(--fb-blue); }
.platform-item[data-platform="pinterest"]:hover .platform-icon { background: rgba(230, 0, 35, 0.15); box-shadow: 0 0 20px rgba(230, 0, 35, 0.2); }
.platform-item[data-platform="pinterest"]:hover .platform-icon svg { color: var(--pin-red); }
.platform-item[data-platform="reddit"]:hover .platform-icon { background: rgba(255, 69, 0, 0.15); box-shadow: 0 0 20px rgba(255, 69, 0, 0.2); }
.platform-item[data-platform="reddit"]:hover .platform-icon svg { color: var(--rd-orange); }
.platform-item[data-platform="twitter"]:hover .platform-icon { background: rgba(255, 255, 255, 0.1); box-shadow: 0 0 20px rgba(255, 255, 255, 0.15); }
.platform-item[data-platform="twitter"]:hover .platform-icon svg { color: var(--tw-black); }
.platform-item[data-platform="threads"]:hover .platform-icon { background: rgba(255, 255, 255, 0.1); box-shadow: 0 0 20px rgba(255, 255, 255, 0.15); }
.platform-item[data-platform="threads"]:hover .platform-icon svg { color: var(--th-black); }
.platform-item[data-platform="dailymotion"]:hover .platform-icon { background: rgba(0, 102, 220, 0.15); box-shadow: 0 0 20px rgba(0, 102, 220, 0.2); }
.platform-item[data-platform="dailymotion"]:hover .platform-icon svg { color: var(--dm-blue); }

.platform-name { font-size: 0.8rem; font-weight: 500; }

/* ---------- 10. How It Works (Steps) ---------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  position: relative;
}

.steps-grid::before {
  content: '';
  position: absolute;
  top: 44px;
  left: 16%;
  right: 16%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--border-glass-hover), var(--border-glass-hover), transparent);
}

.step-card {
  text-align: center;
  padding: var(--space-xl);
  position: relative;
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  margin: 0 auto var(--space-lg);
  position: relative;
  z-index: 1;
  color: #0a0a1a;
  background: var(--accent-gradient);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.step-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-md);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-icon svg { width: 48px; height: 48px; }

.step-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.step-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---------- 11. Features Grid ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.feature-card {
  padding: var(--space-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 2px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  transition: all var(--transition-base);
}

.feature-icon svg { width: 40px; height: 40px; transition: all var(--transition-base); }

.feature-card:hover .feature-icon { transform: scale(1.15); }
.feature-card:hover .icon-animate-bounce { animation: iconBounce 0.6s ease; }
.feature-card:hover .icon-animate-flash { animation: iconFlash 0.6s ease; }
.feature-card:hover .icon-animate-spin { animation: spin 1.5s ease; }
.feature-card:hover .icon-animate-shake { animation: iconShake 0.5s ease; }
.feature-card:hover .icon-animate-pulse { animation: pulse 0.8s ease; }
.feature-card:hover .icon-animate-float { animation: float 1s ease; }

.feature-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.feature-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---------- 12. FAQ Section ---------- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.faq-item {
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.faq-item:hover { border-color: var(--border-glass-hover); }

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-lg);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  transition: all var(--transition-fast);
  background: transparent;
}

.faq-question:hover { background: rgba(255, 255, 255, 0.02); }

.faq-chevron {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition-base);
  color: var(--text-muted);
}

.faq-item.active .faq-chevron { transform: rotate(180deg); color: var(--accent-cyan); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.faq-item.active .faq-answer { max-height: 300px; }

.faq-answer-inner {
  padding: 0 var(--space-lg) var(--space-lg);
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---------- 13. Footer ---------- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-glass);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: var(--space-md);
  line-height: 1.7;
}

.footer-heading {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer-links { display: flex; flex-direction: column; gap: var(--space-sm); }

.footer-links a {
  color: var(--text-muted) !important;
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover { color: var(--text-primary) !important; }

.footer-bottom {
  border-top: 1px solid var(--border-glass);
  padding-top: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- 14. Toast Notifications ---------- */
.toast-container {
  position: fixed;
  top: 85px;
  right: var(--space-lg);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: slideInRight 0.3s ease, fadeOut 0.3s ease 3.7s forwards;
  min-width: 280px;
  font-size: 0.88rem;
}

.toast-success { border-left: 3px solid var(--success); }
.toast-error { border-left: 3px solid var(--error); }

.toast svg { width: 20px; height: 20px; flex-shrink: 0; }
.toast-success svg { color: var(--success); }
.toast-error svg { color: var(--error); }

/* ---------- 15. Loading Skeleton ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.skeleton-thumbnail { width: 280px; aspect-ratio: 16/9; border-radius: var(--radius-md); }
.skeleton-title { height: 24px; width: 80%; margin-bottom: var(--space-sm); }
.skeleton-text { height: 16px; width: 50%; margin-bottom: var(--space-lg); }
.skeleton-pills { display: flex; gap: var(--space-sm); }
.skeleton-pill { height: 36px; width: 90px; border-radius: var(--radius-pill); }

/* ---------- 16. Animations & Keyframes ---------- */
@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

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

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(60px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; transform: translateX(30px); }
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@keyframes iconBounce {
  0%, 100% { transform: scale(1.15) translateY(0); }
  40% { transform: scale(1.15) translateY(-8px); }
  60% { transform: scale(1.15) translateY(-4px); }
}

@keyframes iconFlash {
  0%, 100% { opacity: 1; }
  25% { opacity: 0.2; }
  50% { opacity: 1; }
  75% { opacity: 0.3; }
}

@keyframes iconShake {
  0%, 100% { transform: scale(1.15) translateX(0); }
  20% { transform: scale(1.15) translateX(-4px); }
  40% { transform: scale(1.15) translateX(4px); }
  60% { transform: scale(1.15) translateX(-3px); }
  80% { transform: scale(1.15) translateX(2px); }
}

@keyframes float {
  0%, 100% { transform: scale(1.15) translateY(0); }
  50% { transform: scale(1.15) translateY(-6px); }
}

@keyframes revealIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal { opacity: 0; transform: translateY(30px); transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- 17. Responsive ---------- */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav { display: none; }
  .mobile-toggle { display: flex; }

  .hero { padding: calc(70px + var(--space-2xl)) 0 var(--space-2xl); min-height: auto; }
  .hero-title { font-size: clamp(1.6rem, 7vw, 2.5rem); }

  .search-bar { flex-direction: column; padding: var(--space-md); border-radius: var(--radius-lg); }
  .search-input { padding: var(--space-md); width: 100%; }
  .search-btn { width: 100%; justify-content: center; padding: var(--space-md); border-radius: var(--radius-md); }

  .result-card { flex-direction: column; }
  .result-thumbnail { width: 100%; }

  .steps-grid { grid-template-columns: 1fr; }
  .steps-grid::before { display: none; }

  .features-grid { grid-template-columns: 1fr; }

  .platform-grid { grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--space-md); text-align: center; }

  .section { padding: var(--space-3xl) 0; }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-md); }
  .platform-grid { grid-template-columns: repeat(3, 1fr); }
  .quality-grid { gap: var(--space-xs); }
  .quality-pill { padding: 6px var(--space-sm); font-size: 0.75rem; }
}

/* =========================================
   LIGHT MODE & LAYOUT OVERRIDES 
   ========================================= */
:root {
  --bg-primary: #00b4d8;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f9fafb;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-input: #ffffff;
  --border-glass: #e5e7eb;
  --border-glass-hover: #d1d5db;

  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --text-accent: #00b4d8;
  
  --hero-gradient: none;
  --shadow-glow-cyan: none;
  --shadow-glow-green: none;
}

body { background: var(--bg-primary); }
body::before, .hero-bg::after, .hero-bg { display: none !important; }

/* Header & Nav */
.header { background: #ffffff; border-bottom: none; box-shadow: var(--shadow-sm); }
.logo-icon svg { color: #ffffff; }
.logo { color: #00b4d8 !important; }
.nav-link { color: #4b5563 !important; }
.nav-link:hover, .nav-link.active { background: #f3f4f6; color: #00b4d8 !important; }

/* Hero */
.hero { background: var(--bg-primary); padding-top: 140px; }
.hero-title { color: #ffffff; }
.hero-subtitle { color: #e0f2fe; }
.search-bar { background: #ffffff; border-color: #ffffff; box-shadow: var(--shadow-lg); }
.search-input { color: #1f2937; }

/* Main Content Containers */
.section-alt { background: #f9fafb; }
.glass-card { background: #ffffff; border: 1px solid #e5e7eb; box-shadow: var(--shadow-md); }

/* Result Card Table Layout */
.result-card { padding: 0; display: flex; gap: 0; overflow: hidden; border-radius: var(--radius-lg); background: #ffffff; }
.result-thumbnail { width: 35%; border-radius: 0; border-right: 1px solid #e5e7eb; background: #f9fafb; padding: var(--space-lg); }
.result-info { width: 65%; padding: var(--space-lg); }

@media (max-width: 768px) {
  .result-card { flex-direction: column; }
  .result-thumbnail { width: 100%; border-right: none; border-bottom: 1px solid #e5e7eb; }
  .result-info { width: 100%; }
}

/* Download Rows */
.download-row { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid #f3f4f6; transition: background 0.2s; }
.download-row:hover { background: #f9fafb; }
.download-row:last-child { border-bottom: none; }
.row-info { display: flex; align-items: center; gap: 16px; flex: 1; }
.row-badge { padding: 4px 8px; background: #f59e0b; color: #fff; border-radius: 4px; font-size: 0.75rem; font-weight: 700; min-width: 45px; text-align: center; }
.row-badge.audio { background: #ec4899; }
.row-res { font-weight: 600; color: #1f2937; width: 80px; }
.row-size { color: #6b7280; font-size: 0.9rem; }

.download-btn-hollow {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px; border: 2px solid #10b981; color: #10b981 !important;
  border-radius: 6px; font-weight: 600; font-size: 0.9rem; transition: all 0.2s ease; background: transparent; white-space: nowrap;
}
.download-btn-hollow:hover { background: #10b981; color: #fff !important; }
.download-btn-hollow svg { stroke-width: 2.5; }

details.advanced-options { background: transparent; border-color: #e5e7eb; margin-top: 16px; }