:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.container { max-width: 800px; margin: 0 auto; padding: 16px; }

/* Header */
header {
  background: var(--primary);
  color: white;
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0,0,0,.1);
}
header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header h1 { font-size: 1.25rem; font-weight: 700; }
header .user-info {
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 12px;
}
header .user-info button {
  background: rgba(255,255,255,.2);
  border: none;
  color: white;
  padding: 4px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.8rem;
}

/* Tabs */
.tabs {
  display: flex;
  background: var(--card);
  border-radius: var(--radius);
  margin: 16px 0;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
.tab {
  flex: 1;
  text-align: center;
  padding: 10px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  transition: all .2s;
}
.tab.active { color: var(--primary); border-color: var(--primary); }
.tab:hover { background: #f1f5f9; }

/* Cards */
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
.card h2 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--text);
}
.card h3 {
  font-size: 0.95rem;
  margin-bottom: 8px;
  color: var(--text-muted);
}

/* Punch buttons */
.punch-area {
  display: flex;
  gap: 16px;
  margin: 20px 0;
}
.punch-btn {
  flex: 1;
  padding: 24px;
  font-size: 1.2rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform .1s, box-shadow .2s;
}
.punch-btn:active { transform: scale(.97); }
.punch-btn.clock-in {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 12px rgba(37,99,235,.3);
}
.punch-btn.clock-out {
  background: var(--danger);
  color: white;
  box-shadow: 0 4px 12px rgba(220,38,38,.3);
}
.punch-btn:disabled {
  opacity: .5;
  cursor: not-allowed;
  transform: none;
}

/* Clock */
.clock {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text);
  margin: 12px 0;
  font-variant-numeric: tabular-nums;
}
.clock-date {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* Status badge */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-success { background: #dcfce7; color: var(--success); }
.badge-warning { background: #fef3c7; color: var(--warning); }
.badge-danger { background: #fee2e2; color: var(--danger); }
.badge-info { background: #dbeafe; color: var(--primary); }

/* Forms */
.form-group { margin-bottom: 12px; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 4px;
  color: var(--text-muted);
}
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
}
.form-group textarea { min-height: 60px; resize: vertical; }

.btn {
  padding: 8px 20px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: opacity .2s;
}
.btn:hover { opacity: .9; }
.btn-primary { background: var(--primary); color: white; }
.btn-success { background: var(--success); color: white; }
.btn-warning { background: var(--warning); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-sm { padding: 4px 12px; font-size: 0.8rem; }

/* Table */
table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th, td { padding: 8px; text-align: left; border-bottom: 1px solid var(--border); }
th { font-weight: 600; color: var(--text-muted); font-size: 0.8rem; }

/* Trust score */
.trust-3 { color: var(--success); }
.trust-2 { color: var(--warning); }
.trust-1 { color: var(--danger); }

/* Month nav */
.month-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 16px;
}
.month-nav button {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 12px;
  cursor: pointer;
}
.month-nav span { font-size: 1.1rem; font-weight: 600; }

/* Login screen */
.login-container {
  max-width: 400px;
  margin: 60px auto;
  padding: 0 16px;
}
.login-card {
  background: var(--card);
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 4px 20px rgba(0,0,0,.08);
  text-align: center;
}
.login-card h1 {
  font-size: 1.8rem;
  margin-bottom: 4px;
  color: var(--primary);
}
.login-card p {
  color: var(--text-muted);
  margin-bottom: 24px;
  font-size: 0.9rem;
}

/* Message */
.message {
  padding: 10px 16px;
  border-radius: var(--radius);
  margin-bottom: 12px;
  font-size: 0.85rem;
}
.message-success { background: #dcfce7; color: #166534; }
.message-error { background: #fee2e2; color: #991b1b; }
.message-info { background: #dbeafe; color: #1e40af; }

/* Today info */
.today-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0;
}
.today-info .info-item {
  text-align: center;
}
.today-info .info-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.today-info .info-value {
  font-size: 1.1rem;
  font-weight: 600;
}

/* Responsive */
@media (max-width: 600px) {
  .punch-area { flex-direction: column; }
  .punch-btn { padding: 18px; font-size: 1rem; }
  .clock { font-size: 2rem; }
  .today-info { grid-template-columns: 1fr; }
}