:root {
  --bg: #0e1116;
  --card: #171b22;
  --border: #262c36;
  --text: #e8ecf1;
  --muted: #8b95a3;
  --accent: #38bdf8;
  --green: #34d399;
  --red: #f87171;
  --amber: #fbbf24;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 14px;
  min-height: 100vh;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
}
button {
  font: inherit;
  cursor: pointer;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #1f2530;
  color: var(--text);
  padding: 8px 14px;
}
button:hover { filter: brightness(1.15); }
button:disabled { opacity: .45; cursor: not-allowed; }
button.primary { background: var(--accent); border-color: var(--accent); color: #06121a; font-weight: 600; }
button.danger { background: var(--red); border-color: var(--red); color: #2a0a0a; font-weight: 600; }
button.quiet { background: transparent; }
button.secondary { background: #253042; }
.pill {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  background: #1f2530; border: 1px solid var(--border); font-size: 12px; color: var(--muted);
}
.pill.ok { color: var(--green); border-color: rgba(52,211,153,.4); }
.pill.bad { color: var(--red); border-color: rgba(248,113,113,.4); }
.pill.warn { color: var(--amber); border-color: rgba(251,191,36,.4); }

/* 登录 */
.login-card { max-width: 380px; margin: 9vh auto; }
.login-card h1 { margin: 0 0 6px; font-size: 22px; }
.eyebrow { letter-spacing: .14em; font-size: 11px; color: var(--accent); margin: 0 0 6px; }
.muted { color: var(--muted); font-size: 13px; }
label { display: block; margin: 12px 0 4px; font-size: 13px; color: var(--muted); }
input[type="text"], input[type="password"] {
  width: 100%; padding: 9px 10px; margin-top: 4px;
  background: #0d1117; border: 1px solid var(--border); border-radius: 8px; color: var(--text); font: inherit;
}
.error { color: var(--red); font-size: 13px; min-height: 18px; }

/* 主界面 */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; border-bottom: 1px solid var(--border); gap: 10px; flex-wrap: wrap;
}
.topbar h1 { font-size: 16px; margin: 0; }
.topbar-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.layout { display: flex; gap: 12px; padding: 12px; align-items: flex-start; }
.video-card { flex: 1 1 65%; min-width: 0; }
.video-title-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.video-title-row h2 { font-size: 15px; margin: 0; }
.cam-status { font-size: 12px; color: var(--muted); }
.cam-status.online { color: var(--green); }
.cam-status.offline { color: var(--amber); }
#cameraFrame { width: 100%; aspect-ratio: 16/9; border: none; border-radius: 8px; background: #000; display: block; }

.dash { flex: 0 0 300px; display: flex; flex-direction: column; gap: 12px; }
.dash-card h3 { margin: 0 0 10px; font-size: 14px; }
.hint { color: var(--muted); font-weight: 400; font-size: 11px; }

/* 方向盘表盘 */
.wheel-box { display: flex; justify-content: center; padding: 6px 0 14px; }
.wheel {
  width: 130px; height: 130px; border-radius: 50%;
  border: 5px solid #3a4353;
  background:
    radial-gradient(circle at 50% 50%, #1f2530 0 38%, #2b3342 40% 52%, #1f2530 55% 100%);
  position: relative;
  display: flex; align-items: center; justify-content: center;
  transition: transform .05s linear;
}
.wheel::before, .wheel::after {
  content: ""; position: absolute; background: #3a4353; border-radius: 4px;
}
.wheel::before { width: 6px; height: 100%; }
.wheel::after { width: 100%; height: 6px; }
.wheel span {
  position: relative; z-index: 2; background: #0d1117; color: var(--accent);
  border-radius: 50%; width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 600;
  border: 1px solid var(--border);
}

/* 油门刹车 */
.meter-row { display: flex; align-items: center; gap: 8px; margin: 8px 0; }
.meter-label { width: 34px; font-size: 12px; color: var(--muted); }
.bar { flex: 1; height: 10px; background: #0d1117; border-radius: 6px; overflow: hidden; }
.bar-fill { height: 100%; width: 0; border-radius: 6px; transition: width .05s linear; }
.bar-fill.accel { background: var(--green); }
.bar-fill.brake { background: var(--red); }
.meter-row b { width: 34px; text-align: right; font-variant-numeric: tabular-nums; }

/* 档位 */
.gear-row { display: flex; align-items: center; gap: 10px; }
.gear-row strong { font-size: 22px; flex: 1; text-align: center; }
.gear { min-width: 56px; }
.gear-input { margin-top: 10px; }
input[type="range"] { width: 100%; accent-color: var(--accent); }

/* 方向盘状态 */
.gp-state { font-size: 13px; color: var(--muted); min-height: 36px; }
.gp-state.ok { color: var(--green); }
.btn-row { display: flex; gap: 8px; margin: 10px 0; }
.map-list { font-size: 12px; color: var(--muted); margin-top: 6px; }
.raw-grid { font-size: 11px; color: var(--muted); margin-top: 8px; }

/* 超声波避障 */
.avoid-row { display: flex; gap: 8px; }
.avoid-btn { flex: 1; padding: 8px; }
.avoid-btn.on-btn.active { background: var(--green); border-color: var(--green); color: #06220f; font-weight: 600; }
.avoid-btn.off-btn.active { background: var(--amber); border-color: var(--amber); color: #2a1c06; font-weight: 600; }
.avoid-state { font-size: 12px; margin-top: 8px; color: var(--muted); }
.avoid-state.on { color: var(--green); }
.avoid-state.off { color: var(--amber); }

/* 遥测 */
.tele { display: flex; flex-wrap: wrap; gap: 8px; }
.tele span { font-size: 12px; color: var(--muted); }
.tele b { color: var(--text); font-variant-numeric: tabular-nums; }

.alert {
  margin: 0 12px 12px; padding: 8px 12px; border-radius: 8px;
  background: rgba(251,191,36,.12); border: 1px solid rgba(251,191,36,.35); color: var(--amber);
  font-size: 13px;
}

/* 校准弹窗 */
.overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.65);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.overlay[hidden] { display: none; }
.calib-card { width: min(420px, 90vw); }
.calib-card h2 { margin: 0 0 8px; font-size: 18px; }
.calib-step { font-size: 15px; min-height: 44px; }
.calib-progress { height: 8px; background: #0d1117; border-radius: 6px; overflow: hidden; margin: 12px 0; }
.calib-fill { height: 100%; width: 0; background: var(--accent); transition: width .3s; }

@media (max-width: 900px) {
  .layout { flex-direction: column; }
  .dash { flex: 1 1 auto; width: 100%; }
}