:root {
  --bg: #f8fafc;
  --panel: rgba(255, 255, 255, 0.96);
  --panel-border: rgba(15, 23, 42, 0.06);
  --text: #16202f;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-2: #60a5fa;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(96, 165, 250, 0.18), transparent 24%),
    radial-gradient(circle at bottom right, rgba(37, 99, 235, 0.1), transparent 24%),
    linear-gradient(180deg, #ffffff 0%, #f4f7fb 100%);
}

.page {
  display: grid;
  grid-template-columns: minmax(320px, 540px) minmax(340px, 1fr);
  gap: 26px;
  justify-content: center;
  padding: 28px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  padding: 22px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: 40px;
  line-height: 1.06;
}

.intro {
  color: var(--muted);
  line-height: 1.62;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.grid,
.accordion {
  display: grid;
  gap: 12px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field span {
  font-size: 14px;
  color: var(--muted);
}

.field input,
.field textarea,
.field select {
  width: 100%;
  border: 1px solid rgba(37, 99, 235, 0.14);
  background: rgba(255, 255, 255, 0.96);
  color: var(--text);
  border-radius: 14px;
  padding: 14px 16px;
  font-size: 15px;
  outline: none;
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  border-color: rgba(37, 99, 235, 0.42);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
}

.field textarea {
  resize: vertical;
}

.button,
.link {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
}

.button {
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent), #1d4ed8);
}

.button.secondary {
  color: #1d2633;
  background: linear-gradient(135deg, #edf4ff, #dbeafe);
}

.button.accent {
  background: linear-gradient(135deg, #60a5fa, #2563eb);
}

.button:disabled {
  opacity: 0.65;
  cursor: progress;
}

.status {
  min-height: 24px;
  margin: 0;
  color: var(--muted);
}

.accordion-item {
  border: 1px solid rgba(37, 99, 235, 0.1);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.88);
  padding: 0 14px;
}

.accordion-item summary {
  list-style: none;
  cursor: pointer;
  font-weight: 800;
  padding: 14px 2px;
}

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

.accordion-body {
  display: grid;
  gap: 10px;
  padding: 0 2px 14px;
}

.inline-field {
  margin-top: 2px;
}

.slider-row {
  display: grid;
  grid-template-columns: 74px 1fr 56px;
  align-items: center;
  gap: 10px;
}

.slider-row label {
  color: var(--muted);
  font-size: 13px;
}

.slider-row output {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  font-size: 13px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.accordion-item select {
  min-height: 42px;
}

.preview-wrap {
  display: grid;
  gap: 18px;
  align-content: start;
}

.preview-shell {
  display: flex;
  justify-content: center;
}

.preview {
  position: relative;
  width: min(100%, 420px);
  aspect-ratio: 9 / 16;
  background: #ffffff;
  border-radius: 28px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid rgba(37, 99, 235, 0.08);
}

.preview img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.history {
  padding: 2px 2px 0;
}

.history h2 {
  margin: 0 0 14px;
  font-size: 22px;
}

.video-list {
  display: grid;
  gap: 12px;
}

.empty {
  margin: 0;
  color: var(--muted);
}

.video-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(37, 99, 235, 0.08);
}

.video-meta {
  display: grid;
  gap: 4px;
}

.video-title {
  font-weight: 800;
  font-size: 16px;
}

.video-subtitle {
  color: var(--muted);
  font-size: 13px;
}

.video-actions {
  display: flex;
  gap: 10px;
  flex-shrink: 0;
}

.link {
  color: #1d4ed8;
  background: #eff6ff;
  padding: 10px 14px;
}

@media (max-width: 980px) {
  .page {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  h1 {
    font-size: 32px;
  }

  .video-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .slider-row {
    grid-template-columns: 62px 1fr 46px;
  }
}