/* ========================================
   NAVI LMS - Global Styles
   Apple-inspired minimal UI with glassmorphism
   ======================================== */

/* === CSS Variables === */
:root {
    --primary: #0042FF;
    --primary-light: #3366FF;
    --primary-dark: #0033CC;
    --background: #FFFFFF;
    --surface: #F8F9FA;
    --text-primary: #1A1A1A;
    --text-secondary: #6B7280;
    --border: #E5E7EB;
    --error: #EF4444;
    --success: #10B981;
    --warning: #F59E0B;
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 80px;
    --header-height: 70px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  /* === Reset & Base === */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  

    .att-col-today { background: rgba(31,42,68,.06) !important; }
    .att-col-today-text { color: var(--accent) !important; }
    .att-col-normal-text { color: var(--text); }
    .att-td-today { background: rgba(31,42,68,.04); }
    .att-btn-locked { cursor: default !important; opacity: .45; }
    .att-btn-active { cursor: pointer; }
    @keyframes pulse {
      0%,100% { opacity:1; }
      50% { opacity:.3; }
    }
  html {
    font-size: 16px;
  }
  
  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-primary);
    background: var(--background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  
  /* === Typography === */
  h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 0.5rem;
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  h4 { font-size: 1.125rem; }
  
  p {
    margin-bottom: 1rem;
  }
  
  /* === Buttons === */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
  }
  
  .btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
  }
  
  .btn-primary {
    background: var(--primary);
    color: white;
  }
  
  .btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
  }
  
  .btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
  }
  
  .btn-secondary:hover {
    background: #F1F3F5;
  }
  
  .btn-ghost {
    background: transparent;
    color: var(--text-secondary);
  }
  
  .btn-ghost:hover {
    background: var(--surface);
    color: var(--text-primary);
  }
  
  /* === Form Elements === */
  .form-group {
    margin-bottom: 1.25rem;
  }
  
  .form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
  }
  
  .form-input {
    width: 100%;
    padding: 0.875rem 1.25rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--background);
  }
  
  .form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 66, 255, 0.1);
  }
  
  .form-input.error {
    border-color: var(--error);
  }
  
  .form-error {
    display: block;
    font-size: 0.75rem;
    color: var(--error);
    margin-top: 0.25rem;
  }
  
  /* === Glass Card === */
  .glass-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
  }
  
  /* ========================================
     LOGIN PAGE
     ======================================== */
  
  .login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1rem;
  }
  
  .login-card {
    width: 100%;
    max-width: 420px;
    padding: 2.5rem;
  }
  
  .login-logo {
    text-align: center;
    margin-bottom: 2rem;
  }
  
  .login-logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
  }
  
  .login-logo p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
  }
  
  .login-form {
    margin-bottom: 1.5rem;
  }
  
  .login-footer {
    text-align: center;
  }
  
  .login-footer a {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
  }
  
  .login-footer a:hover {
    text-decoration: underline;
  }
  
  .divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
  }
  
  .divider::before,
  .divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
  }
  
  /* ========================================
     DASHBOARD LAYOUT
     ======================================== */
  
  .dashboard {
    display: flex;
    height: 100vh;
    overflow: hidden;
  }
  
  /* === Sidebar === */
  .sidebar {
    width: var(--sidebar-width);
    background: var(--background);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    position: relative;
    z-index: 100;
  }
  
  .sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
  }
  
  .sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    border-bottom: 1px solid var(--border);
  }
  
  .sidebar-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
  }
  
  .sidebar.collapsed .sidebar-logo {
    display: none;
  }
  
  .sidebar-toggle {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
  }
  
  .sidebar-toggle:hover {
    background: var(--surface);
  }
  
  .sidebar-nav {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
  }
  
  .nav-item {
    margin-bottom: 0.25rem;
  }
  
  .nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-size: 0.95rem;
  }
  
  .nav-link:hover {
    background: var(--surface);
    color: var(--text-primary);
  }
  
  .nav-link.active {
    background: var(--surface);
    color: var(--primary);
    font-weight: 500;
  }
  
  .nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
  }
  
  .nav-text {
    flex: 1;
    white-space: nowrap;
  }
  
  .sidebar.collapsed .nav-text {
    display: none;
  }
  
  .nav-arrow {
    width: 16px;
    height: 16px;
    transition: var(--transition);
  }
  
  .sidebar.collapsed .nav-arrow {
    display: none;
  }
  
  .nav-link.expanded .nav-arrow {
    transform: rotate(90deg);
  }
  
  /* Submenu */
  .nav-submenu {
    display: none;
    padding-left: 3rem;
    margin-top: 0.25rem;
  }
  
  .nav-submenu.show {
    display: block;
  }
  
  .sidebar.collapsed .nav-submenu {
    display: none;
  }
  
  .sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
  }
  
  /* === Main Content === */
  .main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }
  
  .main-header {
    height: var(--header-height);
    background: var(--background);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
  }
  
  .header-title h2 {
    margin: 0;
  }
  
  .user-menu {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition);
  }
  
  .user-menu:hover {
    background: var(--surface);
  }
  
  .user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
  }
  
  .user-name {
    font-weight: 500;
    font-size: 0.95rem;
  }
  
  .main-body {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    background: var(--surface);
  }
  
  /* === Empty State === */
  .empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: 2rem;
  }
  
  .empty-state-icon {
    width: 120px;
    height: 120px;
    margin-bottom: 1.5rem;
    opacity: 0.5;
  }
  
  .empty-state h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
  }
  
  .empty-state p {
    color: var(--text-secondary);
    margin: 0;
  }
  
  /* === Courses Content === */
  .courses-container {
    max-width: 1400px;
    margin: 0 auto;
  }
  
  .section-header {
    margin-bottom: 2rem;
  }
  
  .section-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
  }
  
  .section-header p {
    color: var(--text-secondary);
    margin: 0;
  }
  
  .modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
  }
  
  .module-card {
    background: var(--background);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
  }
  
  .module-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border);
  }
  
  .module-title {
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
  }
  
  .module-progress {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.75rem;
  }
  
  .progress-bar {
    flex: 1;
    height: 8px;
    background: var(--surface);
    border-radius: var(--radius-full);
    overflow: hidden;
  }
  
  .progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
  }
  
  .progress-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
  }
  
  .months-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
  }
  
  .month-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }
  
  .month-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
  }
  
  .month-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
  }
  
  .month-card:hover::before {
    opacity: 1;
  }
  
  .month-card.completed {
    background: linear-gradient(135deg, rgba(0, 66, 255, 0.05) 0%, rgba(0, 66, 255, 0.02) 100%);
    border-color: var(--primary);
  }
  
  .month-card.locked {
    opacity: 0.5;
    cursor: not-allowed;
  }
  
  .month-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
  }
  
  .month-name {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.5em;
  }
  
  .month-status {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 500;
  }
  
  .month-status.completed {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
  }
  
  .month-status.current {
    background: rgba(0, 66, 255, 0.1);
    color: var(--primary);
  }
  
  .month-status.locked {
    background: rgba(107, 114, 128, 0.1);
    color: var(--text-secondary);
  }
  
  /* === Modal === */
  .modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
  }
  
  .modal-overlay.show {
    display: flex;
  }
  
  .modal {
    background: var(--background);
    border-radius: var(--radius-xl);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    display: flex;
    flex-direction: column;
  }
  
  .modal-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .modal-title {
    font-size: 1.5rem;
    margin: 0;
  }
  
  .modal-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--surface);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
  }
  
  .modal-close:hover {
    background: var(--border);
  }
  
  .modal-body {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
  }
  
  /* === Tabs === */
  .tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border);
  }
  
  .tab {
    padding: 0.875rem 1.5rem;
    border: none;
    background: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: var(--transition);
  }
  
  .tab:hover {
    color: var(--text-primary);
  }
  
  .tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
  }
  
  .tab-content {
    display: none;
  }
  
  .tab-content.active {
    display: block;
  }
  
  /* === Lessons Grid === */
  .lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
  }
  
  .lesson-card {
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .lesson-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
  }
  
  .lesson-card.locked {
    opacity: 0.5;
    cursor: not-allowed;
  }
  
  .lesson-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--background);
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--text-secondary);
    flex-shrink: 0;
  }
  
  .lesson-card.completed .lesson-number {
    background: var(--success);
    border-color: var(--success);
    color: white;
  }
  
  .lesson-card.current .lesson-number {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
  }
  
  .lesson-info {
    flex: 1;
  }
  
  .lesson-title {
    font-weight: 500;
    margin-bottom: 0.25rem;
    font-size: 0.95rem;
  }
  
  .lesson-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
  }

  .lesson-status {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .lesson-status-icon {
    opacity: 0.3;
  }

  .lesson-status-icon.completed {
    opacity: 1;
  }

  .lesson-card.completed {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.05);
  }
  
  /* ========================================
     MOBILE RESPONSIVE
     ======================================== */
  
  @media (max-width: 768px) {
    .sidebar {
      position: fixed;
      left: -100%;
      top: 0;
      bottom: 0;
      width: 280px;
      z-index: 200;
      box-shadow: var(--shadow-xl);
    }
    
    .sidebar.mobile-open {
      left: 0;
    }
    
    .sidebar.collapsed {
      width: 280px;
    }
    
    .sidebar.collapsed .sidebar-logo,
    .sidebar.collapsed .nav-text,
    .sidebar.collapsed .nav-arrow {
      display: block;
    }
    
    .sidebar.collapsed .nav-submenu.show {
      display: block;
    }
    
    .mobile-overlay {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(0, 0, 0, 0.5);
      z-index: 150;
    }
    
    .mobile-overlay.show {
      display: block;
    }
    
    .main-header {
      padding: 0 1rem;
    }
    
    .main-body {
      padding: 1rem;
    }
    
    .modules-grid {
      grid-template-columns: 1fr;
    }
    
    .months-grid {
      grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .lessons-grid {
      grid-template-columns: 1fr;
    }
    
    .user-name {
      display: none;
    }
  }
  
  @media (max-width: 480px) {
    .login-card {
      padding: 2rem 1.5rem;
    }
    
    .months-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    
    .module-card {
      padding: 1.5rem;
    }
  }
  
  /* === Utility Classes === */
  .hidden {
    display: none !important;
  }
  
  .text-center {
    text-align: center;
  }
  
  .mt-1 { margin-top: 0.5rem; }
  .mt-2 { margin-top: 1rem; }
  .mt-3 { margin-top: 1.5rem; }
  .mb-1 { margin-bottom: 0.5rem; }
  .mb-2 { margin-bottom: 1rem; }
  .mb-3 { margin-bottom: 1.5rem; }