/* styles.css - Modern, Premium UI for Kumon Center Management System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  /* Colors */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-sidebar: #0f172a;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-on-dark: #f8fafc;
  
  --primary: #6366f1; /* Indigo */
  --primary-hover: #4f46e5;
  --primary-light: #e0e7ff;
  
  --accent: #8b5cf6; /* Violet */
  --accent-light: #f5f3ff;
  
  --success: #10b981; /* Emerald */
  --success-light: #ecfdf5;
  
  --warning: #f59e0b; /* Amber */
  --warning-light: #fef3c7;
  
  --danger: #ef4444; /* Rose */
  --danger-light: #fef2f2;
  
  --border: #e2e8f0;
  
  /* Typography */
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Layout */
  --sidebar-width: 260px;
  
  /* Shadows & Radius */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --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-premium: 0 20px 25px -5px rgb(99 102 241 / 0.08), 0 8px 10px -6px rgb(99 102 241 / 0.08);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Layout Container */
.app-container {
  display: flex;
  width: 100%;
  height: 100vh;
  position: relative;
}

/* Sidebar Navigation */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  color: var(--text-on-dark);
  display: flex;
  flex-direction: column;
  height: 100%;
  z-index: 10;
  box-shadow: var(--shadow-lg);
  flex-shrink: 0;
}

.sidebar-logo {
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-logo svg {
  width: 32px;
  height: 32px;
  color: var(--primary);
  filter: drop-shadow(0 0 4px var(--primary));
}

.logo-text {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, #a5b4fc, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar-menu {
  list-style: none;
  padding: 24px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-grow: 1;
  overflow-y: auto;
}

.menu-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
}

.menu-item a:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-on-dark);
}

.menu-item.active a {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--text-on-dark);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.menu-item a svg {
  width: 20px;
  height: 20px;
  stroke-width: 2;
  transition: var(--transition);
}

.sidebar-footer {
  padding: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
  text-align: center;
}

/* Main Content Area */
.main-wrapper {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

/* Header */
.top-header {
  height: 72px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  box-shadow: var(--shadow-sm);
  z-index: 5;
  flex-shrink: 0;
}

.header-title {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.date-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  background-color: var(--bg-primary);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
}

.profile-card {
  display: flex;
  align-items: center;
  gap: 10px;
}

.profile-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
}

.profile-info {
  display: flex;
  flex-direction: column;
}

.profile-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.profile-role {
  font-size: 11px;
  color: var(--text-muted);
}

/* Page Content Window */
.content-area {
  flex-grow: 1;
  padding: 32px;
  overflow-y: auto;
  position: relative;
}

/* Page Grid & Container Details */
.view-panel {
  display: none;
  animation: fadeIn 0.4s ease-out;
}

.view-panel.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Cards & Dashboards */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.metric-card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-premium);
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary);
  border-radius: 4px 0 0 4px;
}

.metric-card.accent::before { background: var(--accent); }
.metric-card.success::before { background: var(--success); }
.metric-card.warning::before { background: var(--warning); }

.metric-info h3 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 600;
}

.metric-value {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
}

.metric-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.metric-card .metric-icon {
  background-color: var(--primary-light);
  color: var(--primary);
}

.metric-card.accent .metric-icon {
  background-color: var(--accent-light);
  color: var(--accent);
}

.metric-card.success .metric-icon {
  background-color: var(--success-light);
  color: var(--success);
}

.metric-card.warning .metric-icon {
  background-color: var(--warning-light);
  color: var(--warning);
}

/* Dashboard Bottom Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  align-items: start;
}

.dashboard-card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin-bottom: 24px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.card-header h2 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-body);
}

.btn-primary {
  background-color: var(--primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.btn-secondary {
  background-color: white;
  border-color: var(--border);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  background-color: var(--bg-primary);
  border-color: var(--text-muted);
}

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

.btn-danger:hover {
  background-color: #e11d48;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

/* Action Controls (Bar above tables) */
.action-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  gap: 16px;
  flex-wrap: wrap;
}

.search-input-wrapper {
  position: relative;
  flex-grow: 1;
  max-width: 320px;
}

.search-input-wrapper svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  width: 18px;
  height: 18px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  padding-left: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* Filter selects */
.filters {
  display: flex;
  gap: 12px;
}

.filter-select {
  padding: 8px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  font-size: 13px;
  font-family: var(--font-body);
  color: var(--text-secondary);
  background-color: white;
  cursor: pointer;
}

.filter-select:focus {
  outline: none;
  border-color: var(--primary);
}

/* Data Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  background-color: var(--bg-secondary);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.data-table th {
  background-color: #f8fafc;
  padding: 16px 20px;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.5px;
}

.data-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: middle;
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr {
  transition: var(--transition);
}

.data-table tbody tr:hover {
  background-color: #fdfdfd;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  font-size: 11px;
  font-weight: 600;
  border-radius: var(--radius-full);
}

.badge-success {
  background-color: var(--success-light);
  color: var(--success);
}

.badge-warning {
  background-color: var(--warning-light);
  color: var(--warning);
}

.badge-danger {
  background-color: var(--danger-light);
  color: var(--danger);
}

.badge-primary {
  background-color: var(--primary-light);
  color: var(--primary);
}

.badge-secondary {
  background-color: #f1f5f9;
  color: #475569;
}

/* Modal Form Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  transform: scale(0.95) translateY(20px);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
}

.modal-overlay.active .modal-box {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  flex-grow: 1;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  background-color: #f8fafc;
}

/* Forms general */
.form-group {
  margin-bottom: 18px;
}

.form-group.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.input-field {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-primary);
  background-color: white;
  transition: var(--transition);
}

.input-field:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.input-field::placeholder {
  color: var(--text-muted);
}

textarea.input-field {
  min-height: 80px;
  resize: vertical;
}

.checkbox-group {
  display: flex;
  gap: 20px;
  padding: 6px 0;
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
}

.checkbox-label input {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
}

/* Quick Attendance List Card */
.student-attendance-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 380px;
  overflow-y: auto;
  padding-right: 4px;
}

.attendance-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  transition: var(--transition);
}

.attendance-item:hover {
  background-color: white;
  border-color: var(--text-muted);
}

.attendance-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.attendance-name {
  font-weight: 600;
  font-size: 14px;
}

.attendance-details {
  font-size: 12px;
  color: var(--text-secondary);
}

.attendance-action {
  display: flex;
  gap: 8px;
}

/* Reports Specific Layout */
.report-section {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin-bottom: 28px;
}

.report-header {
  border-bottom: 2px solid var(--border);
  padding-bottom: 16px;
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.report-title-row {
  display: flex;
  flex-direction: column;
}

.report-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

.report-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.report-meta-box {
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.report-meta-label {
  font-size: 11px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
}

.report-meta-value {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

/* Custom Scrollbar for premium feel */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* UI Alert Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 1000;
}

.toast {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 12px;
  animation: slideIn 0.3s ease;
  min-width: 280px;
  max-width: 400px;
}

.toast.success { border-left-color: var(--success); }
.toast.danger { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}