@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@400;500;700;800&display=swap");

:root {
  color-scheme: light;
  --bg: #f7f6f1;
  --surface: #ffffff;
  --surface-soft: #f1f0eb;
  --text: #171717;
  --muted: #6e6a62;
  --line: #dedbd2;
  --line-strong: #c9c4b8;
  --accent: #1a73e8;
  --accent-soft: #e8f0fe;
  --success: #0f9d58;
  --warning: #fbbc04;
  --danger: #d93025;
  --shadow: 0 18px 50px rgba(25, 24, 20, 0.08);
  --radius: 8px;
}

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

body {
  min-height: 100vh;
  font-family: "Inter", "Noto Sans SC", sans-serif;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.85), rgba(247, 246, 241, 0.94)),
    var(--bg);
  color: var(--text);
}

.bg-video,
.bg-overlay {
  display: none;
}

.app {
  max-width: 1480px;
  margin: 0 auto;
  padding: 32px clamp(18px, 4vw, 56px) 40px;
  display: grid;
  gap: 18px;
}

.glass {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero {
  padding: 30px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
}

.eyebrow,
.panel-kicker {
  font-size: 11px;
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
  font-weight: 700;
}

.hero h1 {
  font-size: 52px;
  line-height: 1.02;
  letter-spacing: 0;
  font-weight: 800;
}

.hero-copy {
  color: var(--muted);
  max-width: 720px;
  margin-top: 14px;
  line-height: 1.7;
  font-size: 15px;
}

.hero-status {
  display: grid;
  gap: 8px;
  min-width: 240px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 14px;
  border: 1px solid transparent;
}

.status-dot,
.model-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--danger);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(360px, 0.8fr);
  gap: 18px;
}

.camera-panel,
.control-panel {
  padding: 20px;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.panel-head h2 {
  font-size: 30px;
  line-height: 1.1;
  letter-spacing: 0;
}

.live-stats {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.stat-chip,
.foot-stat,
.face-summary div {
  min-width: 108px;
  border-radius: var(--radius);
  padding: 12px;
  background: var(--surface-soft);
  border: 1px solid transparent;
}

.stat-label,
.foot-stat span,
.face-summary span {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
  letter-spacing: 0;
}

.stat-chip strong,
.foot-stat strong,
.face-summary strong {
  color: var(--text);
  font-size: 24px;
  line-height: 1;
}

.camera-wrap {
  position: relative;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius);
  overflow: hidden;
  background: #ebe9e1;
  border: 1px solid var(--line);
}

#previewVideo,
#overlayCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

#previewVideo {
  object-fit: cover;
  transform: scaleX(-1);
}

#overlayCanvas {
  pointer-events: none;
}

.scan-grid {
  display: none;
}

.scan-hint {
  position: absolute;
  left: 14px;
  bottom: 14px;
  max-width: calc(100% - 28px);
  border-radius: var(--radius);
  padding: 9px 12px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(222, 219, 210, 0.9);
  color: var(--muted);
  font-size: 13px;
}

.winner-banner {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%) translateY(-12px);
  opacity: 0;
  padding: 10px 14px;
  border-radius: var(--radius);
  background: var(--text);
  color: white;
  font-weight: 700;
  box-shadow: 0 16px 30px rgba(25, 24, 20, 0.16);
  transition: transform 0.32s ease, opacity 0.32s ease;
}

.winner-banner.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.camera-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  margin-top: 16px;
}

#instructionText {
  color: var(--muted);
  line-height: 1.7;
  max-width: 560px;
  font-size: 14px;
}

.camera-actions {
  display: flex;
  gap: 8px;
}

button,
select,
input {
  border: none;
  border-radius: var(--radius);
  font: inherit;
}

button {
  cursor: pointer;
  padding: 12px 15px;
  color: var(--text);
  transition: transform 0.16s ease, background 0.16s ease, opacity 0.16s ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
}

.primary {
  background: var(--text);
  color: white;
  font-weight: 700;
}

.accent {
  background: var(--accent);
  color: white;
  font-weight: 700;
}

.ghost {
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

.ghost.danger {
  color: var(--danger);
}

.enroll-box {
  padding: 14px;
  border-radius: var(--radius);
  background: var(--surface-soft);
  border: 1px solid transparent;
}

select,
input {
  flex: 1;
  min-width: 0;
  padding: 12px 13px;
  background: white;
  color: var(--text);
  border: 1px solid var(--line);
}

input::placeholder {
  color: #9b968d;
}

input:focus,
select:focus,
button:focus-visible {
  outline: 2px solid rgba(26, 115, 232, 0.28);
  outline-offset: 2px;
}

.face-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.hint {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
  margin-top: 10px;
}

.student-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  max-height: 600px;
  overflow: auto;
  padding-right: 2px;
}

.student-card {
  padding: 14px;
  border-radius: var(--radius);
  background: white;
  border: 1px solid var(--line);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.student-card.is-live {
  border-color: var(--line-strong);
}

.student-card.is-active {
  border-color: var(--accent);
  box-shadow: 0 12px 30px rgba(26, 115, 232, 0.12);
  transform: translateY(-1px);
}

.student-card.is-selected {
  border-color: var(--text);
  box-shadow: 0 12px 30px rgba(25, 24, 20, 0.12);
}

.student-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.student-name {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
}

.face-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 28px;
  padding: 0 8px;
  border-radius: var(--radius);
  background: var(--text);
  color: white;
  font-size: 13px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 8px;
  border-radius: var(--radius);
  font-size: 12px;
  border: 1px solid transparent;
}

.badge.ready {
  background: #e7f4ec;
  color: #116b3a;
}

.badge.empty {
  background: var(--surface-soft);
  color: var(--muted);
}

.badge.live {
  background: var(--accent-soft);
  color: #174ea6;
}

.student-meta {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.student-note {
  color: var(--muted);
  font-size: 13px;
  margin-top: 10px;
  min-height: 18px;
}

.tag-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  margin-top: 12px;
}

.empty-state {
  padding: 18px;
  border-radius: var(--radius);
  border: 1px dashed var(--line-strong);
  color: var(--muted);
  line-height: 1.7;
  background: var(--surface-soft);
}

.panel-foot {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 16px;
}

@media (max-width: 1060px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .camera-footer,
  .hero {
    flex-direction: column;
  }
}

@media (max-width: 720px) {
  .app {
    padding: 18px 12px 28px;
  }

  .hero {
    padding: 22px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .panel-head,
  .hero-status,
  .camera-actions,
  .panel-foot,
  .tag-row {
    grid-template-columns: 1fr;
    display: grid;
  }

  .live-stats {
    justify-content: flex-start;
  }
}