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

:root {
  --bg: #0a0a0f;
  --surface: rgba(255,255,255,0.04);
  --surface-hover: rgba(255,255,255,0.07);
  --border: rgba(255,255,255,0.08);
  --border-focus: rgba(99,102,241,0.6);
  --text: #f1f1f5;
  --text-muted: #8b8b9e;
  --primary: #6366f1;
  --primary-hover: #4f52e0;
  --success: #22c55e;
  --error: #f87171;
  --radius: 14px;
  --radius-sm: 8px;
}

html { font-size: 16px; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: hidden;
}

/* Ambient background orbs */
.bg-orbs { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.18;
}
.orb-1 { width: 500px; height: 500px; background: #6366f1; top: -150px; left: -100px; }
.orb-2 { width: 400px; height: 400px; background: #8b5cf6; bottom: -100px; right: -80px; }
.orb-3 { width: 300px; height: 300px; background: #06b6d4; top: 40%; left: 50%; transform: translateX(-50%); }

.container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 640px;
  padding: 24px 16px 48px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Header */
header { display: flex; justify-content: center; }
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

/* Hero */
.hero { text-align: center; }
.hero h1 {
  font-size: clamp(2rem, 6vw, 2.8rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
}
.gradient-text {
  background: linear-gradient(135deg, #6366f1, #a78bfa, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.subtitle {
  margin-top: 12px;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.6;
}

/* Card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* Input row */
.input-row { display: flex; gap: 10px; }
.input-wrap {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}
.input-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  pointer-events: none;
  flex-shrink: 0;
}
#url-input {
  width: 100%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  padding: 12px 40px 12px 42px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
#url-input::placeholder { color: var(--text-muted); }
#url-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.clear-btn {
  position: absolute;
  right: 10px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  display: none;
  align-items: center;
  transition: color 0.15s;
}
.clear-btn:hover { color: var(--text); }

/* Buttons */
.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 12px 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  transition: background 0.2s, transform 0.1s;
  flex-shrink: 0;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:active { transform: scale(0.97); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-download {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: opacity 0.2s, transform 0.1s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(99,102,241,0.3);
}
.btn-download:hover { opacity: 0.9; box-shadow: 0 6px 28px rgba(99,102,241,0.45); }
.btn-download:active { transform: scale(0.98); }
.btn-download:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* Spinner */
.btn-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Error */
.error-msg {
  background: rgba(248,113,113,0.1);
  border: 1px solid rgba(248,113,113,0.25);
  color: var(--error);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.875rem;
  line-height: 1.5;
}

/* Preview */
.preview {
  display: none;
  gap: 16px;
  align-items: flex-start;
  animation: fadeIn 0.3s ease;
}
.preview.visible { display: flex; }.thumbnail {
  width: 140px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  background: var(--surface-hover);
}
.meta { flex: 1; min-width: 0; }
.video-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.meta-row { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.tag {
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3px 10px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Format selector */
.format-section { display: flex; flex-direction: column; gap: 10px; }
.format-label { font-size: 0.8rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; }
.select-wrap { position: relative; }
.select-wrap select {
  width: 100%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: 0.875rem;
  padding: 11px 40px 11px 14px;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.select-wrap select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.select-wrap select option { background: #1a1a2e; color: var(--text); }
.select-arrow {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

/* Progress */
.progress-wrap {
  display: flex;
  flex-direction: column;
  gap: 10px;
  animation: fadeIn 0.3s ease;
  background: rgba(99,102,241,0.06);
  border: 1px solid rgba(99,102,241,0.15);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.progress-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.progress-bar {
  flex: 1;
  height: 6px;
  background: rgba(255,255,255,0.07);
  border-radius: 99px;
  overflow: hidden;
}
.progress-actions { display: flex; gap: 8px; flex-shrink: 0; }
.progress-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  border: none;
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 5px 10px;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}
.progress-btn:hover { opacity: 0.8; }
.progress-btn:active { transform: scale(0.96); }
.progress-btn.cancel {
  background: rgba(248,113,113,0.12);
  border: 1px solid rgba(248,113,113,0.25);
  color: var(--error);
}
.progress-bar {
  height: 6px;
  background: rgba(255,255,255,0.07);
  border-radius: 99px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #6366f1, #a78bfa, #38bdf8);
  background-size: 200% 100%;
  border-radius: 99px;
  width: 0%;
  transition: width 0.5s ease;
  animation: shimmer 2s linear infinite;
}
@keyframes shimmer {
  0%   { background-position: 200% center; }
  100% { background-position: -200% center; }
}
.progress-label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
}
.progress-label .pct {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.progress-label .meta {
  color: var(--text-muted);
  font-size: 0.78rem;
}

/* Footer */
footer { text-align: center; font-size: 0.8rem; color: var(--text-muted); }
footer a { color: var(--text-muted); text-decoration: underline; text-underline-offset: 3px; }
footer a:hover { color: var(--text); }

@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

@media (max-width: 480px) {
  .input-row { flex-direction: column; }
  .btn-primary { width: 100%; justify-content: center; }
  .preview { flex-direction: column; }
  .thumbnail { width: 100%; height: 180px; }
}