:root {
  color-scheme: light;
  /* 湖蓝色主题 */
  --page-bg: #e9f3ff;
  --card-bg: #ffffff;
  --text-color: #0b2239;
  --muted-text: #5a6b80;
  --border-color: #d0deef;
  --accent: #1f7ae0;
  --accent-dark: #165cae;
  --accent-grad-from: #6ec3ff;
  --accent-grad-to: #1f7ae0;
  --danger: #d64545;
  --speaker-1: #2e7dff;
  --speaker-2: #00a6a6;
  --speaker-3: #8e6cff;
  --speaker-4: #ff7a59;
  --speaker-5: #00b96b;
  --speaker-6: #c45bdf;
  font-family: "HarmonyOS Sans", "Inter", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  background: linear-gradient(180deg, rgba(110,195,255,0.25), rgba(31,122,224,0.12)), var(--page-bg);
  padding: 48px 16px 72px;
  color: var(--text-color);
}

main.card {
  width: min(1080px, 100%);
  background: var(--card-bg);
  border-radius: 20px;
  border: 1px solid rgba(18, 28, 60, 0.08);
  box-shadow: 0 12px 30px rgba(17, 37, 87, 0.12);
  padding: 40px;
  display: grid;
  gap: 32px;
}

header h1 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 2vw + 1rem, 2.3rem);
  word-break: break-word;
}

header .lead {
  margin: 0;
  color: var(--muted-text);
  line-height: 1.7;
}

.alert {
  margin-top: 20px;
  padding: 18px;
  border-radius: 14px;
  line-height: 1.6;
}

.alert-warning {
  background: rgba(214, 69, 69, 0.08);
  border: 1px solid rgba(214, 69, 69, 0.24);
  color: var(--danger);
}

.section {
  border: 1px solid rgba(18, 28, 60, 0.08);
  border-radius: 18px;
  padding: 24px;
  display: grid;
  gap: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.88));
}

.section h2 {
  margin: 0;
  font-size: 1.2rem;
  color: #152040;
}

.field {
  display: grid;
  gap: 8px;
  color: var(--muted-text);
  font-size: 0.95rem;
}

.field > span {
  font-weight: 600;
  color: var(--text-color);
}

input[type="text"],
input[type="number"],
input[type="password"],
textarea,
select {
  width: 100%;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  font-size: 0.98rem;
  background: rgba(255, 255, 255, 0.9);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="password"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(38, 103, 255, 0.16);
}

input[type="file"] {
  padding: 10px 0;
  color: var(--muted-text);
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  color: var(--text-color);
}

.options-grid label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid rgba(38, 103, 255, 0.16);
  background: rgba(38, 103, 255, 0.05);
  font-weight: 600;
}

/* 工具栏样式 */
.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
}

.select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: #fff;
}

.btn {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid rgba(18, 28, 60, 0.12);
  background: linear-gradient(180deg,#fff, #f4f6fb);
  color: #1c2746;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease, filter 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(17,37,87,0.14);
  filter: saturate(1.05);
}

.btn-secondary {
  background: linear-gradient(180deg,#edf0f7,#e6ebf7);
}

button[type="submit"] {
  padding: 16px;
  border-radius: 14px;
  border: none;
  background: linear-gradient(120deg, var(--accent-grad-from), var(--accent-grad-to));
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

button[type="submit"]:hover {
  transform: translateY(-1px);
  box-shadow: 0 20px 40px rgba(40, 104, 255, 0.32);
}

button[type="submit"]:disabled {
  cursor: not-allowed;
  background: #9ba8d5;
  box-shadow: none;
}

textarea {
  min-height: 420px;
  max-height: 70vh;
  resize: vertical;
  font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
  line-height: 1.7;
  white-space: pre-wrap;
}

#transcriptOutput {
  font-size: 0.95rem;
}

.output .grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* 结构化视图样式 */
.structured-view {
  display: grid;
  gap: 16px;
}

.timeline {
  position: relative;
  height: 28px;
  border: 1px dashed var(--border-color);
  border-radius: 10px;
  background: linear-gradient(90deg, rgba(38,103,255,0.08) 0%, transparent 100%);
}

.timeline .tick {
  position: absolute;
  top: 0;
  height: 100%;
  width: 1px;
  background: rgba(28, 39, 86, 0.18);
}

.timeline .label {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  color: var(--muted-text);
}

.timeline .tooltip {
  position: absolute;
  top: -36px;
  transform: translateX(-50%);
  padding: 6px 8px;
  border-radius: 8px;
  background: #1c2746;
  color: #ffffff;
  font-size: 12px;
  white-space: nowrap;
  box-shadow: 0 8px 20px rgba(17,37,87,0.24);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.timeline:hover .tooltip {
  opacity: 1;
}

.channels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
}

.channel-column {
  border: 1px solid rgba(18,28,60,0.08);
  border-radius: 12px;
  padding: 12px;
  background: rgba(255,255,255,0.9);
}

.channel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  color: var(--muted-text);
  font-size: 0.95rem;
}

.speaker-group {
  margin-bottom: 12px;
}

.speaker-title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: 6px;
}

.speaker-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 2px solid #ffffff;
  box-shadow: 0 2px 6px rgba(17,37,87,0.18);
}

.segment-item {
  padding: 8px 10px;
  border-left: 3px solid var(--accent);
  background: rgba(38,103,255,0.06);
  border-radius: 10px;
  margin: 6px 0;
}
.segment-item.active {
  outline: 2px solid var(--accent);
  background: rgba(110,195,255,0.18);
}

.segment-meta {
  font-size: 12px;
  color: var(--muted-text);
}

.editable {
  outline: none;
}
.editable:focus {
  box-shadow: inset 0 0 0 2px rgba(31,122,224,0.25);
  background: rgba(110,195,255,0.12);
}

.highlight {
  background: rgba(214,69,69,0.18);
  border-radius: 6px;
}

pre {
  background: #0f172a;
  color: #f8fafc;
  padding: 16px;
  border-radius: 14px;
  min-height: 160px;
  max-height: 50vh;
  overflow: auto;
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre-wrap;
}

a {
  color: var(--accent-dark);
}

a:hover {
  color: var(--accent);
}

@media (max-width: 640px) {
  body {
    padding: 24px 12px 48px;
  }

  main.card {
    padding: 28px;
    border-radius: 16px;
  }

  .section {
    padding: 20px;
  }
}