:root {
  --bg: #0a0e18;
  --bg-soft: #111827;
  --panel: rgba(22, 30, 48, 0.72);
  --line: rgba(120, 150, 200, 0.16);
  --text: #e8eefc;
  --muted: #8695b5;
  --cyan: #38e8d6;
  --violet: #8ca0ff;
  --pink: #ff8ac8;
  --amber: #ffd166;
  --ar: 16 / 9;
}

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

html,
body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background:
    radial-gradient(1100px 620px at 12% -10%, rgba(56, 232, 214, 0.13), transparent 60%),
    radial-gradient(900px 620px at 92% 0%, rgba(140, 160, 255, 0.14), transparent 62%),
    var(--bg);
  min-height: 100%;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 18px 22px 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 100vh;
}

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.brand .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(56, 232, 214, 0.15), 0 0 14px var(--cyan);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  50% {
    opacity: 0.45;
  }
}

.modes {
  display: flex;
  gap: 6px;
  padding: 5px;
  border-radius: 999px;
  background: rgba(18, 26, 42, 0.75);
  border: 1px solid var(--line);
  margin-left: auto;
}

.mode-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 13.5px;
  font-family: inherit;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.18s, background 0.18s, box-shadow 0.18s;
  white-space: nowrap;
}

.mode-btn:hover {
  color: var(--text);
}

.mode-btn.active {
  color: #06231f;
  background: linear-gradient(135deg, var(--cyan), #7ae0ff);
  box-shadow: 0 4px 18px rgba(56, 232, 214, 0.32);
  font-weight: 600;
}

.perf {
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  min-width: 62px;
  text-align: right;
}

.perf span {
  color: var(--cyan);
  font-weight: 600;
}

/* ---------- 主体布局 ---------- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 292px;
  gap: 16px;
  align-items: start;
  flex: 1;
}

/* ---------- 画面区 ---------- */
.stage {
  position: relative;
  width: 100%;
  aspect-ratio: var(--ar);
  border-radius: 18px;
  overflow: hidden;
  background: #060a12;
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  isolation: isolate;
}

.stage video,
.stage canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.stage video {
  object-fit: cover;
  transform: scaleX(-1); /* 自拍镜像 */
  filter: saturate(1.05) contrast(1.02);
}

#overlay,
#fx {
  pointer-events: none;
}

.stage::after {
  /* 顶部渐隐，让文字可读 */
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 90px;
  background: linear-gradient(to bottom, rgba(6, 10, 18, 0.55), transparent);
  pointer-events: none;
}

.stage-hint {
  position: absolute;
  left: 16px;
  top: 14px;
  z-index: 5;
  font-size: 12.5px;
  color: rgba(232, 238, 252, 0.82);
  background: rgba(8, 14, 24, 0.5);
  backdrop-filter: blur(8px);
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  max-width: calc(100% - 32px);
}

/* ---------- 启动遮罩 ---------- */
.boot {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 14px;
  background: rgba(6, 10, 18, 0.92);
  backdrop-filter: blur(6px);
  transition: opacity 0.35s;
  text-align: center;
  padding: 24px;
}

.boot[hidden] {
  display: none;
}

.boot.fade {
  opacity: 0;
  pointer-events: none;
}

.boot p {
  font-size: 13.5px;
  color: var(--muted);
  max-width: 340px;
  line-height: 1.65;
}

.spinner {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 2.5px solid rgba(56, 232, 214, 0.18);
  border-top-color: var(--cyan);
  animation: spin 0.9s linear infinite;
}

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

.retry {
  appearance: none;
  border: 1px solid rgba(56, 232, 214, 0.4);
  background: rgba(56, 232, 214, 0.12);
  color: var(--cyan);
  font-family: inherit;
  font-size: 13px;
  padding: 8px 20px;
  border-radius: 999px;
  cursor: pointer;
}

.retry:hover {
  background: rgba(56, 232, 214, 0.22);
}

/* ---------- 侧栏 ---------- */
.panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 15px 16px;
  backdrop-filter: blur(10px);
}

.card h3 {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

.kv {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 9px 12px;
  font-size: 13px;
}

.kv dt {
  color: var(--muted);
}

.kv dd {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.readout {
  font-size: 13px;
  line-height: 1.9;
}

.muted {
  color: var(--muted);
  font-size: 12.5px;
}

.metric {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 5px 0;
}

.metric + .metric {
  border-top: 1px dashed rgba(120, 150, 200, 0.1);
}

.metric .label {
  color: var(--muted);
  font-size: 12.5px;
}

.metric .value {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--cyan);
}

.bar {
  height: 5px;
  border-radius: 3px;
  background: rgba(120, 150, 200, 0.16);
  overflow: hidden;
  margin-top: 6px;
}

.bar > i {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transition: width 0.1s linear;
}

.tip {
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--muted);
}

.tip b {
  color: var(--text);
  font-weight: 600;
}

.score-badge {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: 26px;
  font-weight: 700;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.score-badge small {
  font-size: 12px;
  color: var(--muted);
  font-weight: 500;
}

/* ---------- 窄屏 ---------- */
@media (max-width: 980px) {
  .app {
    padding: 14px 14px 24px;
  }
  .layout {
    grid-template-columns: 1fr;
  }
  .modes {
    order: 3;
    width: 100%;
    margin-left: 0;
    justify-content: space-between;
  }
  .mode-btn {
    flex: 1;
    padding: 9px 8px;
  }
  .panel {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .card {
    flex: 1 1 200px;
  }
}