:root {
  /* Brand colors */
  --brand-50:  #eef2ff;
  --brand-100: #e0e7ff;
  --brand-500: #6366f1;
  --brand-600: #4f46e5;
  --brand-700: #4338ca;

  /* Accent (Cyan) */
  --accent-50:  #ecfeff;
  --accent-500: #06b6d4;
  --accent-600: #0891b2;

  /* Semantic */
  --success-50:  #ecfdf5;
  --success-500: #10b981;
  --success-600: #059669;

  --warning-50:  #fffbeb;
  --warning-500: #f59e0b;
  --warning-600: #d97706;

  --danger-50:   #fef2f2;
  --danger-500:  #ef4444;
  --danger-600:  #dc2626;

  /* Neutrals (Slate) */
  --gray-50:   #f8fafc;
  --gray-100:  #f1f5f9;
  --gray-200:  #e2e8f0;
  --gray-300:  #cbd5e1;
  --gray-400:  #94a3b8;
  --gray-500:  #64748b;
  --gray-600:  #475569;
  --gray-700:  #334155;
  --gray-800:  #1e293b;
  --gray-900:  #0f172a;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow:    0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Radius */
  --radius-sm: 6px;
  --radius:    8px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Layout */
  --sidebar-w: 260px;
  --sidebar-w-collapsed: 72px;
}

/* ---- Base ---- */
* {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
html, body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--gray-800);
  background: var(--gray-50);
}

/* ---- Sidebar Layout ---- */
.app-layout {
  display: flex;
  min-height: 100vh;
}
.sidebar {
  width: var(--sidebar-w);
  background: white;
  border-right: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 50;
  transition: transform 0.25s ease, width 0.25s ease;
}
.main-content {
  flex: 1;
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.topbar {
  height: 64px;
  background: white;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  padding: 0 24px;
  position: sticky;
  top: 0; z-index: 40;
}
.page-content { padding: 32px; flex: 1; }

/* Sidebar Brand */
.sidebar-brand {
  height: 64px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 20px;
  border-bottom: 1px solid var(--gray-100);
}
.brand-logo {
  width: 34px; height: 34px;
  background: linear-gradient(135deg, var(--brand-500), var(--accent-500));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 18px;
  box-shadow: 0 4px 10px -2px rgba(99,102,241,0.4);
}
.brand-name {
  font-weight: 700;
  font-size: 17px;
  color: var(--gray-900);
  letter-spacing: -0.01em;
}

/* Sidebar Nav */
.sidebar-nav {
  padding: 16px 12px;
  flex: 1;
  overflow-y: auto;
}
.nav-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-400);
  padding: 12px 12px 6px;
}
.nav-item {
  display: flex; align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border-radius: var(--radius);
  color: var(--gray-600);
  font-weight: 500;
  font-size: 14px;
  transition: all 0.15s ease;
  cursor: pointer;
  margin-bottom: 2px;
  text-decoration: none;
}
.nav-item:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}
.nav-item.active {
  background: var(--brand-50);
  color: var(--brand-600);
  font-weight: 600;
}
.nav-item.active svg { stroke: var(--brand-600); }
.nav-item svg { width: 18px; height: 18px; stroke-width: 2; flex-shrink: 0; }

/* Sidebar Footer (user) */
.sidebar-footer {
  border-top: 1px solid var(--gray-100);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-500), var(--accent-500));
  color: white;
  font-weight: 600;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.user-info { flex: 1; min-width: 0; }
.user-name {
  font-size: 13px; font-weight: 600; color: var(--gray-900);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.user-email {
  font-size: 11px; color: var(--gray-500);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.icon-btn {
  width: 32px; height: 32px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--gray-500);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.15s;
}
.icon-btn:hover { background: var(--gray-100); color: var(--gray-800); }
.icon-btn svg { width: 18px; height: 18px; stroke-width: 2; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14px;
  transition: all 0.15s;
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; stroke-width: 2.2; }

.btn-primary {
  background: var(--brand-600);
  color: white;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--brand-700); box-shadow: var(--shadow); }

.btn-success {
  background: var(--success-600);
  color: white;
  box-shadow: var(--shadow-sm);
}
.btn-success:hover { background: var(--success-500); }

.btn-danger {
  background: var(--danger-600);
  color: white;
}
.btn-danger:hover { background: var(--danger-500); }

.btn-secondary {
  background: white;
  color: var(--gray-700);
  border-color: var(--gray-200);
}
.btn-secondary:hover { background: var(--gray-50); border-color: var(--gray-300); }

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
}
.btn-ghost:hover { background: var(--gray-100); color: var(--gray-900); }

.btn-lg { padding: 13px 24px; font-size: 15px; }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-block { width: 100%; }

/* ---- Cards ---- */
.card {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}
.card-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--gray-900);
}
.card-body { padding: 22px; }

/* ---- Stat Cards ---- */
.stat-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: all 0.15s;
}
.stat-card:hover {
  border-color: var(--gray-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.stat-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 14px;
}
.stat-icon svg { width: 20px; height: 20px; stroke-width: 2; }
.stat-label {
  font-size: 12px; font-weight: 600;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 6px;
}
.stat-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat-sub { font-size: 12px; color: var(--gray-500); margin-top: 4px; }

/* Stat color variants */
.stat-icon.indigo { background: var(--brand-50); color: var(--brand-600); }
.stat-icon.green  { background: var(--success-50); color: var(--success-600); }
.stat-icon.yellow { background: var(--warning-50); color: var(--warning-600); }
.stat-icon.red    { background: var(--danger-50); color: var(--danger-600); }
.stat-icon.cyan   { background: var(--accent-50); color: var(--accent-600); }

/* ---- Badges ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.badge-success { background: var(--success-50); color: var(--success-600); }
.badge-warning { background: var(--warning-50); color: var(--warning-600); }
.badge-danger  { background: var(--danger-50);  color: var(--danger-600); }
.badge-info    { background: var(--brand-50);   color: var(--brand-600); }
.badge-gray    { background: var(--gray-100);   color: var(--gray-600); }

.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  display: inline-block;
}

/* ---- Status Dots (for history) ---- */
.status-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}
.dot-full  { background: var(--success-500); box-shadow: 0 0 0 3px var(--success-50); }
.dot-half  { background: linear-gradient(90deg, var(--warning-500) 50%, var(--gray-200) 50%); box-shadow: 0 0 0 3px var(--warning-50); }
.dot-active{ background: var(--brand-500); box-shadow: 0 0 0 3px var(--brand-50); animation: pulse 2s infinite; }
.dot-leave { background: var(--danger-500); box-shadow: 0 0 0 3px var(--danger-50); }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ---- Forms ---- */
.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: 6px;
}
.form-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--gray-900);
  background: white;
  transition: all 0.15s;
  outline: none;
}
.form-input:focus {
  border-color: var(--brand-500);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-input::placeholder { color: var(--gray-400); }
.form-input-with-icon { padding-left: 40px; }
.form-input-wrapper { position: relative; }
.form-input-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
  pointer-events: none;
}
.form-input-icon svg { width: 16px; height: 16px; }

/* ---- Toast ---- */
.toast {
  position: fixed;
  top: 20px; right: 20px;
  background: var(--gray-900);
  color: white;
  padding: 12px 18px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-xl);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 500;
  animation: slideIn 0.25s ease-out;
  max-width: 400px;
}
.toast svg { width: 18px; height: 18px; flex-shrink: 0; }
.toast-success { background: var(--success-600); }
.toast-error   { background: var(--danger-600); }
.toast-warning { background: var(--warning-600); }
.toast-info    { background: var(--brand-600); }

@keyframes slideIn {
  from { transform: translateX(120%); opacity: 0; }
  to   { transform: translateX(0); opacity: 1; }
}

/* ---- Loading Skeleton ---- */
.skeleton {
  background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.4s infinite;
  border-radius: 6px;
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---- Camera Overlay ---- */
.camera-wrap {
  position: relative;
  background: black;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  box-shadow: var(--shadow-xl);
}
.face-guide-oval {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.face-guide-oval::before {
  content: '';
  width: 220px;
  height: 280px;
  border: 3px solid rgba(255,255,255,0.5);
  border-radius: 50%;
  box-shadow: 0 0 0 9999px rgba(0,0,0,0.35);
}

/* ---- Mobile Responsive ---- */
.mobile-menu-btn { display: none; }

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: var(--shadow-xl);
  }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .mobile-menu-btn { display: flex; }
  .page-content { padding: 20px 16px; }
  .sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,0.5);
    z-index: 45;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s;
  }
  .sidebar-overlay.open { opacity: 1; pointer-events: auto; }
}

/* ---- Utilities ---- */
.pulse-ring {
  box-shadow: 0 0 0 0 rgba(99,102,241, 0.5);
  animation: pulse-ring 1.6s infinite;
}
@keyframes pulse-ring {
  0%   { box-shadow: 0 0 0 0 rgba(99,102,241, 0.5); }
  100% { box-shadow: 0 0 0 16px rgba(99,102,241, 0); }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-400); }