:root {
  --bg: #ffffff;
  --bg-alt: #f8f9fb;
  --card: #ffffff;
  --text: #1a1a2e;
  --muted: #64748b;
  --soft: #94a3b8;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #2563eb;
  --success: #16a34a;
  --warning: #f59e0b;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.2s ease;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg-alt);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-hover); }

/* ===== Layout ===== */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px 48px; }

/* ===== Topbar ===== */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 0; margin-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand span { font-weight: 800; font-size: 1.1rem; color: var(--text); }

.brand-badge {
  width: 36px; height: 36px; border-radius: 8px;
  display: grid; place-items: center;
  background: var(--primary); color: #fff;
  font-size: 0.7rem; font-weight: 800; letter-spacing: 0.5px;
}

.nav { display: flex; align-items: center; gap: 6px; }

.nav a {
  color: var(--muted); font-size: 0.88rem; font-weight: 500;
  padding: 8px 14px; border-radius: 8px;
  transition: var(--transition);
}
.nav a:hover { color: var(--text); background: rgba(0,0,0,0.04); }

/* ===== Hero ===== */
.hero {
  display: grid; grid-template-columns: 1fr 420px; gap: 32px;
  align-items: start;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800; line-height: 1.15;
  margin-bottom: 12px; letter-spacing: -0.5px;
}

.hero > section:first-child p {
  color: var(--muted); font-size: 1rem; line-height: 1.7;
  margin-bottom: 0;
}

.pill-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }

.pill {
  border: 1px solid var(--border); background: var(--bg);
  color: var(--muted); padding: 6px 14px;
  border-radius: 20px; font-size: 0.82rem; font-weight: 500;
}

.notice {
  margin-top: 16px; background: #fffbeb; border: 1px solid #fde68a;
  color: #92400e; padding: 12px 16px;
  border-radius: var(--radius-sm); font-size: 0.88rem;
}

/* ===== Card / Converter ===== */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; box-shadow: var(--shadow-lg);
}

.converter-card { padding: 24px; position: sticky; top: 20px; }

.converter-title {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
}
.converter-title h2 { font-size: 1.2rem; font-weight: 700; }

.free-badge {
  background: #f0fdf4; color: var(--success);
  border: 1px solid #bbf7d0;
  padding: 4px 12px; border-radius: 20px;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 1px;
}

/* ===== Dropzone ===== */
.dropzone {
  border: 2px dashed var(--border); background: var(--bg-alt);
  border-radius: 14px; padding: 28px 16px;
  text-align: center; cursor: pointer;
  transition: var(--transition);
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary); background: var(--primary-light);
}

.drop-icon { font-size: 2rem; margin-bottom: 8px; }
.dropzone strong { display: block; font-size: 0.95rem; color: var(--text); }
.dropzone span { display: block; color: var(--muted); margin-top: 4px; font-size: 0.88rem; }
input[type=file] { display: none; }

/* ===== Rules ===== */
.rules {
  margin: 14px 0; display: grid; gap: 4px;
  color: var(--soft); font-size: 0.85rem;
}

/* ===== Form Row ===== */
.row { display: grid; gap: 6px; margin: 14px 0; }
label { color: var(--muted); font-size: 0.88rem; font-weight: 600; }

select {
  width: 100%; background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px 14px; font-size: 0.92rem; font-family: var(--font);
  outline: none; transition: var(--transition);
}
select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }

/* ===== File List ===== */
.file-list { display: grid; gap: 6px; margin: 14px 0; max-height: 150px; overflow: auto; }

.file-item {
  display: flex; justify-content: space-between; align-items: center;
  gap: 10px; background: var(--bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 10px 14px;
  color: var(--muted); font-size: 0.88rem;
}
.file-item b { color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 240px; }

/* ===== Actions ===== */
.actions { display: grid; gap: 8px; margin-top: 16px; }

button, .button-link {
  border: 0; border-radius: var(--radius-sm);
  padding: 13px 16px; font-weight: 700; cursor: pointer;
  transition: var(--transition); text-decoration: none;
  text-align: center; font-size: 0.92rem; font-family: var(--font);
}

.primary {
  color: #fff; background: var(--primary);
  box-shadow: 0 2px 8px rgba(37,99,235,0.3);
}
.primary:hover:not(:disabled) {
  background: var(--primary-hover); transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.35);
}

.secondary {
  color: var(--text); background: var(--bg);
  border: 1px solid var(--border);
}
.secondary:hover { background: var(--bg-alt); border-color: var(--muted); }

button:disabled { opacity: 0.5; cursor: not-allowed; }

.button-link { display: inline-block; }

/* ===== Progress ===== */
.progress-wrap {
  margin-top: 14px; background: var(--border-light);
  border-radius: 999px; overflow: hidden; height: 8px;
}
.progress {
  width: 0%; height: 100%; background: var(--primary);
  border-radius: 999px; transition: width 0.3s ease;
}

.status { min-height: 22px; color: var(--muted); font-size: 0.88rem; margin-top: 10px; }

/* ===== Downloads ===== */
.downloads { display: grid; gap: 6px; margin-top: 12px; }

.download-item {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; padding: 10px 14px; border-radius: var(--radius-sm);
  background: #f0fdf4; border: 1px solid #bbf7d0;
}
.download-item a { color: var(--success); font-weight: 700; }

/* ===== Content Grid ===== */
.content-grid {
  margin-top: 32px; display: grid;
  grid-template-columns: repeat(3, 1fr); gap: 14px;
}

.info-card { padding: 22px; }
.info-card h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 6px; }
.info-card p { color: var(--muted); font-size: 0.88rem; line-height: 1.6; }

/* ===== Comparison ===== */
.comparison { margin-top: 20px; padding: 28px; }
.comparison h2 { font-size: 1.3rem; font-weight: 800; margin-bottom: 16px; }

.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

.plan {
  padding: 20px; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--bg);
}
.plan h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.plan ul { padding-left: 18px; color: var(--muted); line-height: 1.9; font-size: 0.88rem; }

.pro {
  border-color: var(--primary); background: var(--primary-light);
}

.small { color: var(--soft); font-size: 0.84rem; margin-top: 20px; }

/* ===== YouTube Section ===== */
.yt-section {
  margin-bottom: 16px;
}

.yt-section label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 8px;
}

.yt-input-row {
  display: flex;
  gap: 8px;
}

.yt-input {
  flex: 1;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text);
  font-size: 0.92rem;
  font-family: var(--font);
  outline: none;
  transition: var(--transition);
}

.yt-input::placeholder { color: var(--soft); }

.yt-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.yt-btn {
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
  border: none;
  background: #dc2626;
  color: #fff;
  font-family: var(--font);
  transition: var(--transition);
  white-space: nowrap;
}

.yt-btn:hover {
  background: #b91c1c;
  transform: translateY(-1px);
}

.yt-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.yt-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid #fff;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

.yt-hint {
  display: block;
  font-size: 0.8rem;
  color: var(--soft);
  margin-top: 6px;
}

/* ===== Divider ===== */
.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0;
  color: var(--soft);
  font-size: 0.82rem;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ===== YouTube Result ===== */
.yt-result {
  display: none;
  margin-top: 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.yt-result.show {
  display: block;
  animation: fadeSlide 0.3s ease;
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.yt-result-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.yt-result-icon { font-size: 1.2rem; }

.yt-result-title {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text);
}

.yt-result-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

.yt-result-meta strong { color: var(--text); }

.yt-result-actions {
  display: flex;
  gap: 8px;
}

.yt-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--success);
  color: #fff;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.88rem;
  text-decoration: none;
  transition: var(--transition);
}

.yt-download-btn:hover {
  background: #15803d;
  color: #fff;
  transform: translateY(-1px);
}

.yt-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .converter-card { position: static; }
  .content-grid, .compare-grid { grid-template-columns: 1fr; }
  .topbar { flex-direction: column; gap: 12px; align-items: flex-start; }
  .nav { flex-wrap: wrap; }
}