:root {
  color-scheme: dark;
  --bg: #0b0d12;
  --card: #151821;
  --border: #262b38;
  --text: #e6e8ee;
  --muted: #8a90a2;
  --ok: #1f9d55;
  --bad: #c92a3a;
  --warn: #b8860b;
  --accent: #5b8def;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  margin: 0;
  overflow: hidden;
}

.setup {
  max-width: 420px;
  margin: 40px auto;
  padding: 20px;
}
.setup h1 { font-size: 20px; margin-bottom: 4px; }
.setup p.sub { color: var(--muted); font-size: 14px; margin-top: 0; }

.mode-toggle { display: flex; gap: 8px; margin: 16px 0; }
.mode-toggle button {
  flex: 1;
  padding: 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.mode-toggle button.active { border-color: var(--accent); background: #1a2333; }

.setup a.go,
.setup button.go {
  display: block;
  width: 100%;
  margin-top: 16px;
  padding: 14px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 16px;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}
.setup .err { color: var(--bad); margin-top: 10px; font-size: 14px; }

.scan-screen { display: none; height: 100vh; flex-direction: column; }
.scan-screen.active { display: flex; }

.scan-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.scan-header .badge {
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 13px;
  background: var(--accent);
}
.scan-header .staff-name {
  flex: 1;
  margin-left: 10px;
  color: var(--muted);
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.scan-header button.switch {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
}

.camera-wrap { position: relative; flex: 1; background: #000; overflow: hidden; }
.camera-wrap video { width: 100%; height: 100%; object-fit: cover; }
.camera-wrap .hint {
  position: absolute; bottom: 16px; left: 0; right: 0;
  text-align: center; color: #fff; text-shadow: 0 1px 3px rgba(0,0,0,.8); font-size: 14px;
}

.result-overlay {
  position: fixed; inset: 0; display: none;
  flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 24px; z-index: 10;
}
.result-overlay.show { display: flex; }
.result-overlay.ok { background: var(--ok); }
.result-overlay.invalid { background: var(--bad); }
.result-overlay.already_used { background: var(--warn); }
.result-overlay .big { font-size: 56px; font-weight: 800; color: #fff; letter-spacing: 1px; }
.result-overlay .detail { margin-top: 20px; color: #fff; font-size: 18px; line-height: 1.6; }
.result-overlay .detail strong { display: block; font-size: 22px; }
.result-overlay .tap { margin-top: 30px; color: rgba(255,255,255,.85); font-size: 14px; }