@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --secondary: #10B981;
  --danger: #EF4444;
  --background: #0F172A;
  --surface: rgba(30, 41, 59, 0.7);
  --surface-border: rgba(255, 255, 255, 0.1);
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--background);
  background-image: radial-gradient(circle at 15% 50%, rgba(79, 70, 229, 0.15), transparent 25%),
                    radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.15), transparent 25%);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Glassmorphism Utilities */
.glass-panel {
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--surface-border);
  border-radius: 16px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--surface-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--text-main);
}

/* Forms (Login/Signup) */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 2rem;
}

.auth-card {
  width: 100%;
  max-width: 400px;
  padding: 2.5rem;
  text-align: center;
}

.auth-card h1 {
  margin-bottom: 0.5rem;
  font-size: 1.8rem;
}

.auth-card p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 1.5rem;
  text-align: left;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  color: var(--text-main);
  font-family: 'Inter', sans-serif;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.btn {
  display: inline-block;
  width: 100%;
  padding: 0.75rem 1.5rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.2s ease;
  text-decoration: none;
  text-align: center;
}

.btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
}

.auth-links {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.auth-links a {
  color: var(--primary);
  text-decoration: none;
}

.auth-links a:hover {
  text-decoration: underline;
}

/* Dashboard / Home */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.stat-card {
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.stat-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.stat-info h3 {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.stat-info p {
  font-size: 1.8rem;
  font-weight: 700;
}

/* Calendar */
.calendar-wrapper {
  margin-top: 2rem;
  padding: 2rem;
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.5rem;
  text-align: center;
}

.calendar-day-name {
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.5rem;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}

.calendar-day:hover {
  border-color: var(--surface-border);
  background: rgba(255, 255, 255, 0.1);
}

.day-present {
  border-bottom: 3px solid var(--secondary);
}

.day-absent {
  border-bottom: 3px solid var(--danger);
}

.day-late {
  border-bottom: 3px solid #F59E0B;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease forwards;
}

/* Page Headers */
.page-header {
  margin-bottom: 2rem;
}

.page-header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.page-header p {
  color: var(--text-muted);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }
  
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }
  
  .calendar-day {
    padding: 0.25rem;
    font-size: 0.8rem;
  }
  
  .calendar-wrapper {
    padding: 0.5rem;
    margin-top: 1rem;
  }
  
  .calendar-grid {
    gap: 0.25rem;
  }
  
  .calendar-day-name {
    padding: 0.25rem;
    font-size: 0.75rem;
  }
  
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  
  .stat-card {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
  
  .container {
    padding: 1rem;
  }
  
  .auth-card {
    padding: 1.5rem;
  }
}

/* Admin Layout */
.admin-layout {
  display: flex;
  min-height: 100vh;
}

.admin-sidebar {
  width: 250px;
  background: rgba(15, 23, 42, 0.95);
  border-right: 1px solid var(--surface-border);
  padding: 2rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.admin-sidebar .logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #F59E0B; /* distinct color for admin */
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 1rem;
  margin-bottom: 2rem;
}

.admin-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.admin-nav a {
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: all 0.3s ease;
}

.admin-nav a:hover, .admin-nav a.active {
  background: var(--glass-bg);
  color: var(--text-main);
}

.admin-content {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
}

/* Data Tables */
.data-table-wrapper {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th, .data-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--surface-border);
}

.data-table th {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.9rem;
}

.data-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.status-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  display: inline-block;
}

.status-active { background: rgba(16, 185, 129, 0.1); color: var(--secondary); }
.status-inactive { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease forwards;
}

.admin-section {
  display: none;
}
.admin-section.active {
  display: block;
  animation: fadeIn 0.4s ease forwards;
}