:root {
  --bg: #f7f7f8;
  --card: #ffffff;
  --border: #e6e6ea;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0a84ff;
  --accent-hover: #006edc;
  --good: #34c759;
  --warn: #ff9f0a;
  --bad: #ff453a;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Pretendard",
    "Apple SD Gothic Neo", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- 카메라 카드 ---------- */
.camera-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.video-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
}

#video, #overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  /* 셀카뷰처럼 좌우 반전 */
  transform: scaleX(-1);
}

#video { object-fit: cover; }
#overlay { pointer-events: none; }

.status-pill {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 14px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: background 0.2s, color 0.2s;
}

.status-idle { background: rgba(255, 255, 255, 0.9); color: var(--muted); }
.status-good { background: var(--good); color: #fff; }
.status-forward { background: var(--warn); color: #fff; }
.status-alert { background: var(--bad); color: #fff; animation: pulse 0.8s infinite; }

@keyframes pulse {
  0%, 100% { transform: translateX(-50%) scale(1); }
  50% { transform: translateX(-50%) scale(1.05); }
}

.signal-bar {
  position: relative;
  margin-top: 14px;
  height: 28px;
  background: #eef0f3;
  border-radius: 8px;
  overflow: hidden;
}

.signal-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: linear-gradient(90deg, var(--good), var(--warn), var(--bad));
  transition: width 0.15s linear;
}

.signal-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  mix-blend-mode: difference;
  color: #fff;
}

/* ---------- 컨트롤 ---------- */
.controls {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.row { display: flex; gap: 12px; flex-wrap: wrap; }
.primary-row { margin-bottom: 14px; }
.settings-row { align-items: center; }

.btn {
  flex: 1 1 200px;
  padding: 12px 16px;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn:active:not(:disabled) { transform: translateY(1px); }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }

.btn-secondary { background: #e8e8ed; color: var(--text); }
.btn-secondary:hover:not(:disabled) { background: #dcdce1; }
.btn-secondary.active { background: var(--good); color: #fff; }

.setting {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--muted);
}
.setting > span { font-weight: 500; }
.setting select,
.setting input[type="number"] {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  font-size: 14px;
  color: var(--text);
}
.setting.checkbox {
  flex-direction: row;
  align-items: center;
  gap: 6px;
}

/* ---------- 디버그 ---------- */
.debug-panel {
  margin-top: 20px;
  background: #1d1d1f;
  color: #f7f7f8;
  border-radius: 12px;
  padding: 16px 20px;
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 12px;
}
.debug-panel h3 { margin: 0 0 8px; font-size: 13px; color: #98989d; }
.debug-panel ul { list-style: none; padding: 0; margin: 0; }
.debug-panel li { padding: 2px 0; }
.debug-panel span { color: #5ac8fa; font-weight: 600; }

.hidden { display: none !important; }

/* ---------- 푸터 ---------- */
.app-footer {
  margin-top: 28px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}
.app-footer .small { font-size: 11px; opacity: 0.7; margin-top: 4px; }