/* ═══════════════════════════════════════════════
   NexToolsX · style.css
   Author: NexToolsX
   Theme: Dark-first, YouTube-red accent, Syne + DM Sans
   ═══════════════════════════════════════════════ */

/* ── 1. CSS Variables ── */
:root {
  --red: #ff2d2d;
  --red-dim: #cc1f1f;
  --red-glow: rgba(255, 45, 45, 0.25);
  --green: #22c55e;
  --green-dim: #16a34a;

  /* Dark theme */
  --bg: #0d0d0f;
  --surface: #161618;
  --surface-2: #1f1f22;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f0f0f0;
  --text-muted: #888;
  --text-faint: #555;

  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;

  --radius: 28px;
  --radius-lg: 40px;
  --radius-pill: 999px;
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-2: #ebebed;
  --border: rgba(0, 0, 0, 0.08);
  --text: #111;
  --text-muted: #666;
  --text-faint: #aaa;
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.12);
}

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

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

/* ── 3. Header ── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  background: rgba(13, 13, 15, 0.75);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

[data-theme="light"] .site-header {
  background: rgba(245, 245, 247, 0.85);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
}

.logo-icon {
  font-size: 1.1rem;
  color: var(--red);
  filter: drop-shadow(0 0 6px var(--red-glow));
  animation: pulse-icon 3s ease-in-out infinite;
}

@keyframes pulse-icon {
  0%, 100% { filter: drop-shadow(0 0 4px var(--red-glow)); }
  50% { filter: drop-shadow(0 0 12px var(--red-glow)); }
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.lang-dropdown-wrapper {
  position: relative;
}

.lang-btn, .theme-btn {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.85rem;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), border-color var(--transition);
  letter-spacing: 0.04em;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  min-width: 60px;
}

.lang-arrow {
  font-size: 0.6rem;
  transition: transform var(--transition);
}

.lang-btn[aria-expanded="true"] .lang-arrow {
  transform: scaleY(-1);
}

.lang-btn:hover, .theme-btn:hover {
  background: var(--surface);
  border-color: var(--red);
  transform: translateY(-1px);
}

.theme-btn { padding: 0.35rem 0.65rem; font-size: 1rem; }

/* Language Dropdown */
.lang-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem;
  list-style: none;
  min-width: 150px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  z-index: 1000;
  animation: slideDown 0.2s ease-out;
}

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

.lang-dropdown[hidden] {
  display: none;
}

.lang-dropdown li {
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition);
  font-size: 0.85rem;
  font-family: var(--font-display);
}

.lang-dropdown li:hover {
  background: var(--surface);
}

.lang-dropdown li.selected {
  background: var(--red);
  color: white;
  font-weight: 600;
}

/* ── 4. Hero Section ── */
.hero {
  position: relative;
  padding: 6rem 1.5rem 5rem;
  text-align: center;
  overflow: hidden;
}

/* Glow orbs */
.hero-bg { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.18;
  animation: float-glow 8s ease-in-out infinite alternate;
}

[data-theme="light"] .glow { opacity: 0.12; }

.glow-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--red), transparent);
  top: -200px; left: -100px;
}

.glow-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #ff6b00, transparent);
  bottom: -150px; right: -80px;
  animation-delay: 3s;
}

@keyframes float-glow {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, 20px) scale(1.08); }
}

.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 0%, black 0%, transparent 100%);
}

/* Hero content */
.hero-content {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.4rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 45, 45, 0.12);
  border: 1px solid rgba(255, 45, 45, 0.3);
  color: var(--red);
  border-radius: var(--radius-pill);
  padding: 0.3rem 1rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  font-family: var(--font-display);
  animation: fade-in-down 0.6s ease both;
}

@keyframes fade-in-down {
  from { opacity: 0; transform: translateY(-12px); }
  to   { opacity: 1; transform: translateY(0); }
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text);
  animation: fade-in-up 0.7s 0.1s ease both;
}

h1 em {
  font-style: normal;
  color: var(--red);
  position: relative;
}

h1 em::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red), transparent);
  border-radius: 2px;
}

@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero-sub {
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 300;
  animation: fade-in-up 0.7s 0.2s ease both;
}

/* ── 5. Input wrapper ── */
.input-wrapper {
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  animation: fade-in-up 0.7s 0.3s ease both;
}

.input-row {
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0.45rem 0.45rem 0.45rem 1rem;
  gap: 0.6rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow);
}

.input-row:focus-within {
  border-color: var(--red);
  box-shadow: 0 0 0 3px var(--red-glow), var(--shadow);
}

.input-icon { font-size: 1.05rem; flex-shrink: 0; opacity: 0.7; }

#urlInput {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text);
  min-width: 0;
}

#urlInput::placeholder { color: var(--text-faint); }

.btn-extract {
  background: var(--red);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 0.7rem 1.4rem;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}

.btn-text {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-extract:hover {
  background: var(--red-dim);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(255, 45, 45, 0.4);
}

.btn-extract:active { transform: translateY(0); }

.btn-extract.loading .btn-text { opacity: 0; }
.btn-extract.loading .btn-loader { display: block; }

.btn-loader {
  display: none;
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 18px; height: 18px;
  border: 2.5px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Error */
.error-msg {
  color: var(--red);
  font-size: 0.82rem;
  text-align: left;
  padding-left: 0.5rem;
  min-height: 1.2rem;
  font-weight: 500;
}

/* Format tags */
.format-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  animation: fade-in-up 0.7s 0.4s ease both;
}

.format-tags span {
  font-size: 0.72rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.7rem;
  font-family: 'Courier New', monospace;
}

/* Tools Link */
.tools-link {
  margin: 1.5rem 0;
  animation: fade-in-up 0.5s 0.3s ease both;
}

.tool-card {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 1.2rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}

.tool-card:hover {
  border-color: var(--red);
  background: var(--surface-3);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(255, 45, 45, 0.2);
}

.tool-icon {
  font-size: 1.2rem;
}

/* History Section */
.history-section {
  margin-top: 1.5rem;
  animation: fade-in-up 0.5s ease both;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.history-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.history-clear {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.7rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.history-clear:hover {
  color: var(--text);
  background: var(--surface-2);
}

.history-list {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

@media (min-width: 601px) {
  .history-list {
    gap: 1rem;
  }
  
  .history-item {
    min-width: 140px;
  }
}

.history-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  transition: all var(--transition);
}

.history-item:hover {
  border-color: var(--red);
  background: var(--surface-3);
  transform: translateY(-2px);
}

.history-item img {
  width: 64px;
  height: 48px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.history-id {
  font-size: 0.75rem;
  font-family: 'Courier New', monospace;
  color: var(--text-muted);
}

.history-empty {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ── 6. Result Section ── */
.result-section {
  padding: 2rem 1.5rem 4rem;
  max-width: 900px;
  margin: 0 auto;
  animation: fade-in-up 0.5s ease both;
}

.result-inner { display: flex; flex-direction: column; gap: 1.8rem; }

.video-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.82rem;
}

.meta-label { color: var(--text-muted); font-weight: 500; }

.video-id-display {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.15rem 0.6rem;
  font-size: 0.82rem;
  color: var(--red);
  font-family: 'Courier New', monospace;
  letter-spacing: 0.04em;
}

/* Quality grid */
.quality-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.2rem;
}

/* Quality card */
.quality-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  cursor: default;
}

.quality-card:hover {
  transform: translateY(-4px);
  border-color: var(--red);
  box-shadow: 0 12px 40px rgba(255, 45, 45, 0.15);
}

.card-img-wrap {
  position: relative;
  overflow: hidden;
  background: var(--surface-2);
  aspect-ratio: 16/9;
}

.card-img-wrap img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  loading: lazy;
  transition: transform 0.4s ease, filter 0.3s ease;
  filter: brightness(0.95);
}

.quality-card:hover .card-img-wrap img {
  transform: scale(1.03);
  filter: brightness(1);
}

/* Skeleton loader for images */
.card-img-wrap.skeleton::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(90deg,
    var(--surface-2) 25%,
    var(--border) 50%,
    var(--surface-2) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
}

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

.card-body {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

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

.quality-label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}

.quality-res {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--surface-2);
  border-radius: var(--radius-pill);
  padding: 0.15rem 0.6rem;
  border: 1px solid var(--border);
}

.card-actions {
  display: flex;
  gap: 0.6rem;
}

/* Buttons inside cards */
.btn-download, .btn-copy {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border-radius: 10px;
  padding: 0.6rem 0.8rem;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.btn-download {
  background: var(--red);
  color: #fff;
}

.btn-download:hover {
  background: var(--red-dim);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(255, 45, 45, 0.4);
}

.btn-copy {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-copy:hover {
  background: var(--border);
  transform: translateY(-1px);
}

.btn-copy.copied {
  border-color: #22c55e;
  color: #22c55e;
}

/* ── 7. FAQ Section ── */
.faq-section {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 4rem 1.5rem;
}

.faq-inner {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.faq-inner h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.faq-list { display: flex; flex-direction: column; gap: 0.7rem; }

.faq-item {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item[open] { border-color: rgba(255, 45, 45, 0.4); }

.faq-item summary {
  padding: 1rem 1.2rem;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
  color: var(--text);
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--red);
  transition: transform var(--transition);
  line-height: 1;
}

.faq-item[open] summary::after { transform: rotate(45deg); }

.faq-body {
  padding: 0 1.2rem 1rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ── 8. Footer ── */
.site-footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.78rem;
  color: var(--text-faint);
  border-top: 1px solid var(--border);
}

/* ── 9. Responsive ── */
@media (max-width: 600px) {
  .hero { padding: 4rem 1rem 3.5rem; }

  h1 { font-size: 2rem; }

  .input-row { flex-direction: column; align-items: stretch; padding: 0.6rem; gap: 0.5rem; }

  .btn-extract { width: 100%; justify-content: center; padding: 0.85rem; }

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

  .card-actions { flex-direction: column; }

  .format-tags { display: none; }
}

/* ── 10. Accessibility: Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ── 11. Hidden utility ── */
[hidden] { display: none !important; }