:root {
  --qr-box-size: clamp(280px, 90vw, 520px);
}

.bg-gradient {
  background:
    radial-gradient(ellipse at 20% 20%, rgba(59, 130, 246, 0.08) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 80%, rgba(34, 197, 94, 0.05) 0%, transparent 55%);
}

[data-theme="light"] .bg-gradient {
  background:
    radial-gradient(ellipse at 20% 20%, rgba(59, 130, 246, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(34, 197, 94, 0.02) 0%, transparent 50%);
  opacity: 0.3;
}

.scanner-page {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

header {
  position: relative;
  padding: var(--space-3) 0 var(--space-1);
  text-align: center;
}

.logo {
  font-size: clamp(1.8rem, 3vw, 2.3rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 6px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.theme-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  position: absolute;
  top: var(--space-3);
  right: 0;
}

.theme-icon {
  width: 20px;
  height: 20px;
  stroke-width: 2;
  color: var(--text-primary);
  position: absolute;
  transition: all 0.3s ease;
}

.sun-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0.8);
}

.moon-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

[data-theme="light"] .sun-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

[data-theme="light"] .moon-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.8);
}

.status-banner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(34, 197, 94, 0.08));
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: visible;
}

.status-indicator {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 14px var(--accent-green);
  animation: pulse 2s infinite;
  flex-shrink: 0;
}

.status-indicator.occupied {
  background: var(--accent-amber);
  box-shadow: 0 0 14px var(--accent-amber);
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.55;
  }
}

.scanner-shell {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

@media (min-width: 1024px) {
  .scanner-shell {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
    align-items: start;
  }
}

.status-toast {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: var(--bg-card);
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: var(--shadow-soft);
  display: none;
  pointer-events: none;
  z-index: 5;
  min-width: 220px;
  text-align: right;
}

.status-toast.active {
  display: block;
}

.status-toast.success {
  border-color: var(--accent-green);
  background: linear-gradient(135deg,
    rgba(34, 197, 94, 0.12),
    var(--bg-card)
  );
  color: var(--accent-green);
}

.status-toast.warning {
  border-color: var(--accent-amber);
  background: linear-gradient(135deg,
    rgba(245, 158, 11, 0.12),
    var(--bg-card)
  );
  color: var(--accent-amber);
}

.status-toast.error {
  border-color: var(--accent-red);
  background: linear-gradient(135deg,
    rgba(239, 68, 68, 0.12),
    var(--bg-card)
  );
  color: var(--accent-red);
}

@media (max-width: 640px) {
  .status-toast {
    position: static;
    transform: none;
    width: 100%;
    margin-top: var(--space-3);
    text-align: left;
  }

  .status-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}

.scanner-card {
  padding: var(--space-5);
}

.qr-box {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #000;
  aspect-ratio: 1 / 1;
  width: 100%;
  max-width: var(--qr-box-size);
  margin: 0 auto;
  border: 1px solid var(--border-color);
}

#qr-reader video {
  object-fit: cover;
}

.manual-entry {
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-color);
  display: grid;
  gap: var(--space-3);
}

.location-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-3);
}

.location-btn {
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-3);
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
}

.location-btn:hover {
  border-color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.1);
}

.location-btn.selected {
  border-color: var(--accent-green);
  background: rgba(34, 197, 94, 0.1);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  z-index: 100;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  width: min(100%, 460px);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-soft);
  animation: modalIn 0.28s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  text-align: center;
  margin-bottom: var(--space-4);
}

.modal-header h2 {
  margin: 0 0 var(--space-2);
  font-size: 1.4rem;
}

.modal-header p {
  color: var(--text-secondary);
}

.student-name {
  color: var(--accent-blue);
  font-weight: 700;
}

.modal-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.feedback {
  position: fixed;
  top: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  display: none;
  align-items: center;
  gap: var(--space-3);
  z-index: 200;
  max-width: calc(100% - 40px);
  box-shadow: var(--shadow-soft);
}

.feedback.active {
  display: flex;
  animation: slideIn 0.3s ease;
}

.feedback.success {
  border-color: var(--accent-green);
}

.feedback.error {
  border-color: var(--accent-red);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translate(-50%, -10px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

.currently-out {
  padding: var(--space-5);
}

.out-list {
  margin-top: var(--space-3);
  display: grid;
  gap: var(--space-3);
}

.out-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

.out-name {
  font-weight: 700;
}

.out-details {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.out-timer {
  justify-self: start;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-family: "JetBrains Mono", monospace;
  font-weight: 600;
  background: rgba(59, 130, 246, 0.18);
  color: var(--accent-blue);
}

.out-timer.warning {
  background: rgba(245, 158, 11, 0.18);
  color: var(--accent-amber);
}

.out-timer.overtime {
  background: rgba(239, 68, 68, 0.18);
  color: var(--accent-red);
}

@media (min-width: 640px) {
  .out-item {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .out-timer {
    justify-self: end;
  }
}

.empty-state {
  text-align: center;
  padding: var(--space-5);
  color: var(--text-secondary);
}

.nav-links {
  margin-top: auto;
  padding-top: var(--space-5);
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--accent-blue);
}

.status-text strong {
  display: block;
  font-size: 1rem;
}

.status-text span {
  color: var(--text-secondary);
  font-size: 0.92rem;
}