:root {
  --bg: #0a0e1a;
  --panel: #131a2b;
  --panel-2: #1a2338;
  --border: #263250;
  --text: #eaf0ff;
  --text-dim: #8ea0c6;
  --accent: #4c8dff;
  --accent-2: #7fb0ff;
  --good: #35d38a;
  --warn: #f2b544;
  --bad: #ff5b6e;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  touch-action: manipulation;
}

#app {
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(10px + var(--safe-top)) 14px 10px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, #4c8dff, #35d38a);
  box-shadow: 0 0 8px rgba(76,141,255,0.6);
}

.topbar-actions { display: flex; gap: 6px; }

.icon-btn {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.icon-btn svg { width: 20px; height: 20px; fill: currentColor; }
.icon-btn:active { background: var(--border); }

.level-widget { padding: 0; overflow: hidden; }
.level-widget canvas { display: block; }

.weather-chip {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-dim);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 10px;
  white-space: nowrap;
  flex-shrink: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.view {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.screen {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.hidden { display: none !important; }

/* Permission screen */
#screen-permission {
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.permission-card {
  max-width: 420px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.permission-icon { color: var(--accent-2); }
.permission-card h1 { font-size: 1.3rem; margin: 4px 0 0; }
.permission-card p { color: var(--text-dim); font-size: 0.92rem; line-height: 1.4; margin: 0; }
.permission-status { font-size: 0.85rem; color: var(--text-dim); }
.permission-help {
  text-align: left;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.permission-help p { color: var(--text); margin: 0 0 6px; }
.permission-help ul { margin: 0; padding-left: 18px; }
.permission-help li { margin-bottom: 4px; }

.btn-primary, .btn-secondary, .btn-danger {
  border: none;
  border-radius: 12px;
  padding: 12px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.btn-primary { background: linear-gradient(135deg, #4c8dff, #3a6fe0); color: #fff; }
.btn-primary:active { filter: brightness(0.9); }
.btn-secondary { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:active { background: var(--border); }
.btn-danger { background: rgba(255,91,110,0.15); color: var(--bad); border: 1px solid rgba(255,91,110,0.35); }

/* Live screen */
#screen-live { padding-bottom: 8px; }
.camera-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  background: #000;
  overflow: hidden;
  flex-shrink: 0;
}
#video, #video-cal-mirror {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
#overlay, #cal-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(0,0,0,0.55);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  font-size: 0.72rem;
  padding: 4px 9px;
  border-radius: 999px;
  backdrop-filter: blur(4px);
}
.badge-stability { left: auto; right: 10px; background: rgba(242,181,68,0.25); border-color: rgba(242,181,68,0.5); color: #ffd98a; }

.torch-btn {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.5);
  border: 1px solid rgba(255,255,255,0.25);
}
.torch-btn.active { background: rgba(242,181,68,0.85); color: #201400; }

.tare-btn {
  position: absolute;
  bottom: 10px;
  left: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px 8px 10px;
  border-radius: 999px;
  background: rgba(0,0,0,0.5);
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 0.2s ease, transform 0.15s ease;
}
.tare-btn svg { width: 18px; height: 18px; fill: none; }
.tare-btn:active:not(:disabled) { transform: scale(0.95); }
.tare-btn:disabled { opacity: 0.45; }
.tare-btn.flash { background: rgba(53,211,138,0.85); border-color: rgba(53,211,138,0.9); color: #06210f; }

.readout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.readout-value {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.readout-value .unit { font-size: 1.1rem; color: var(--text-dim); margin-left: 4px; font-weight: 600; }
.readout-sub { color: var(--text-dim); font-size: 0.85rem; margin-top: 4px; }
.readout-meta { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; color: var(--text-dim); flex-shrink: 0; }

.snapshot-btn {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, #4c8dff, #3a6fe0);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 10px rgba(76,141,255,0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.2s ease;
}
.snapshot-btn svg { width: 24px; height: 24px; }
.snapshot-btn:active { transform: scale(0.92); }
.snapshot-btn:disabled {
  background: var(--panel-2);
  color: var(--text-dim);
  box-shadow: none;
  opacity: 0.6;
}
.snapshot-btn.flash {
  background: linear-gradient(135deg, #35d38a, #21a86b);
  box-shadow: 0 0 0 6px rgba(53,211,138,0.25);
}

.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--text-dim); flex-shrink: 0; }
.dot.good { background: var(--good); box-shadow: 0 0 6px rgba(53,211,138,0.7); }
.dot.warn { background: var(--warn); box-shadow: 0 0 6px rgba(242,181,68,0.7); }
.dot.bad { background: var(--bad); }

.hint {
  padding: 12px 16px;
  color: var(--text-dim);
  font-size: 0.82rem;
  line-height: 1.4;
}
.hint strong { color: var(--accent-2); }

/* Calibration screen */
#screen-calibrate .cal-panel {
  padding: 14px 16px 24px;
  background: var(--panel);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.cal-instructions { color: var(--text-dim); font-size: 0.87rem; line-height: 1.4; margin: 0; }
.cal-fields { display: flex; gap: 12px; }
.cal-fields label {
  flex: 1;
  font-size: 0.78rem;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cal-fields input {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 10px;
  font-size: 1rem;
}
.cal-actions { display: flex; gap: 10px; margin-top: auto; }
.cal-actions button { flex: 1; }

/* Settings screen */
.settings-panel { padding: 16px; display: flex; flex-direction: column; gap: 4px; }
.settings-panel h2 { margin: 4px 0 10px; font-size: 1.1rem; }
.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.settings-title { font-size: 0.94rem; font-weight: 600; }
.settings-sub { font-size: 0.78rem; color: var(--text-dim); margin-top: 2px; }
.settings-close { margin-top: 18px; }

.lens-select {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 9px 10px;
  font-size: 0.85rem;
  max-width: 46vw;
  flex-shrink: 0;
}

.switch { position: relative; display: inline-block; width: 46px; height: 26px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute; cursor: pointer; inset: 0;
  background: var(--panel-2); border: 1px solid var(--border);
  transition: 0.2s; border-radius: 999px;
}
.slider::before {
  content: ""; position: absolute; height: 18px; width: 18px; left: 3px; top: 2px;
  background: var(--text-dim); border-radius: 50%; transition: 0.2s;
}
.switch input:checked + .slider { background: rgba(76,141,255,0.35); border-color: var(--accent); }
.switch input:checked + .slider::before { transform: translateX(20px); background: var(--accent); }

/* Tab bar */
.tabbar {
  display: flex;
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 6px 6px calc(6px + var(--safe-bottom));
  flex-shrink: 0;
}
.tab-btn {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 6px 0;
  font-size: 0.68rem;
  border-radius: 10px;
}
.tab-btn svg { width: 20px; height: 20px; fill: none; }
.tab-btn.active { color: var(--accent-2); }
.tab-btn:active { background: var(--panel-2); }

@media (min-width: 560px) {
  .camera-wrap { max-width: 480px; margin: 0 auto; aspect-ratio: 3/4; }
  .permission-card, .readout, .hint, .settings-panel, .cal-panel { max-width: 480px; margin-left: auto; margin-right: auto; width: 100%; }
}