:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #172033;
  --muted: #667085;
  --line: #e5e7eb;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --soft: #eff6ff;
  --danger: #b42318;
  --success: #027a48;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(circle at top left, #dbeafe 0, transparent 32rem), var(--bg);
}

.page {
  width: min(960px, calc(100% - 32px));
  margin: 40px auto;
}

.card {
  background: rgba(255,255,255,.9);
  border: 1px solid rgba(229,231,235,.9);
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(23,32,51,.08);
  padding: 28px;
  backdrop-filter: blur(10px);
}

.hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  font-size: 13px;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1;
  letter-spacing: -0.04em;
}

.subtitle {
  margin: 18px 0 0;
  max-width: 680px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
}

.badge {
  flex: none;
  padding: 9px 14px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: var(--soft);
  font-weight: 700;
  font-size: 14px;
}

.form-card { margin-bottom: 20px; }
label {
  display: block;
  font-weight: 700;
  margin-bottom: 10px;
}
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  resize: vertical;
  font-size: 16px;
  min-height: 112px;
  outline: none;
  transition: border .2s, box-shadow .2s;
}
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(37,99,235,.12);
}

.checkline {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin: 14px 0 18px;
  color: var(--muted);
  font-weight: 500;
  line-height: 1.5;
}

.checkline input { margin-top: 4px; }
.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
button {
  border: 0;
  border-radius: 14px;
  background: var(--primary);
  color: #fff;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: transform .12s, box-shadow .12s, background .12s;
  box-shadow: 0 10px 24px rgba(37,99,235,.25);
}
button:hover { transform: translateY(-1px); background: var(--primary-dark); }
button:disabled { opacity: .55; cursor: not-allowed; transform: none; }
button.secondary {
  color: var(--primary-dark);
  background: var(--soft);
  box-shadow: none;
}
button.ghost {
  color: var(--muted);
  background: #f3f4f6;
  box-shadow: none;
  padding: 8px 12px;
}

.hint {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.6;
  font-size: 14px;
}

.status {
  margin: 0 0 20px;
  border-radius: 18px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: #fff;
  white-space: pre-wrap;
  line-height: 1.6;
}
.status.error { color: var(--danger); border-color: #fecdca; background: #fffbfa; }
.status.success { color: var(--success); border-color: #abefc6; background: #f6fef9; }

.result { margin-bottom: 20px; }
.video-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 20px;
  align-items: start;
}
.thumbnail {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 18px;
  background: #eef2ff;
}
.meta h2 {
  margin: 0 0 10px;
  font-size: 24px;
}
.meta p { margin: 6px 0; color: var(--muted); }
.download-link {
  display: inline-flex;
  margin-top: 14px;
  color: #fff;
  background: var(--success);
  padding: 12px 16px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 800;
}
.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}
.section-title h2 { margin: 0; }
.recent-list { display: grid; gap: 10px; }
.recent-item {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}
.recent-item a { color: var(--primary-dark); font-weight: 800; text-decoration: none; }
.small { color: var(--muted); font-size: 13px; }

@media (max-width: 680px) {
  .page { width: min(100% - 20px, 960px); margin: 20px auto; }
  .hero, .video-card { grid-template-columns: 1fr; display: grid; }
  .card { padding: 20px; border-radius: 20px; }
  .badge { width: fit-content; }
  .recent-item { flex-direction: column; }
}