/* ============================================================================
   ADVANCED SCHOOL MANAGEMENT SYSTEM - MAIN STYLESHEET
   Modern, Premium Design with CSS Variables
   ============================================================================ */

/* ============================================================================
   CSS VARIABLES - DESIGN TOKENS
   ============================================================================ */
:root {
    /* Primary Colors */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    /* Secondary - Green */
    --success-50: #ecfdf5;
    --success-100: #d1fae5;
    --success-500: #10b981;
    --success-600: #059669;
    --success-700: #047857;
    
    /* Warning - Amber */
    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    
    /* Danger - Red */
    --danger-50: #fef2f2;
    --danger-100: #fee2e2;
    --danger-500: #ef4444;
    --danger-600: #dc2626;
    
    /* Info - Cyan */
    --info-50: #ecfeff;
    --info-100: #cffafe;
    --info-500: #06b6d4;
    --info-600: #0891b2;
    
    /* Purple */
    --purple-50: #faf5ff;
    --purple-500: #8b5cf6;
    --purple-600: #7c3aed;
    
    /* Neutral - Gray */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Semantic Colors */
    --color-primary: var(--primary-600);
    --color-primary-hover: var(--primary-700);
    --color-secondary: var(--gray-600);
    --color-success: var(--success-500);
    --color-warning: var(--warning-500);
    --color-danger: var(--danger-500);
    --color-info: var(--info-500);
    
    /* Text Colors */
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-muted: var(--gray-400);
    --text-light: var(--gray-500);
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);
    
    /* Border Colors */
    --border-light: var(--gray-200);
    --border-default: var(--gray-300);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Poppins', var(--font-sans);
    --font-mono: 'Roboto Mono', 'Fira Code', monospace;
    
    /* Sidebar */
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 70px;
    --sidebar-bg: var(--gray-900);
    --sidebar-text: rgba(255, 255, 255, 0.8);
    
    /* Header */
    --header-height: 64px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-primary: var(--gray-900);
    --bg-secondary: var(--gray-800);
    --bg-tertiary: var(--gray-700);
    --text-primary: var(--gray-100);
    --text-secondary: var(--gray-400);
    --border-light: var(--gray-700);
    --border-default: var(--gray-600);
}

/* ============================================================================
   RESET & BASE
   ============================================================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
    margin-bottom: var(--spacing-4);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-primary { color: var(--color-primary) !important; }
.text-success { color: var(--color-success) !important; }
.text-warning { color: var(--color-warning) !important; }
.text-danger { color: var(--color-danger) !important; }
.text-info { color: var(--color-info) !important; }

/* ============================================================================
   LOGIN PAGE
   ============================================================================ */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--purple-600) 100%);
    padding: var(--spacing-4);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at center, rgba(255,255,255,0.1) 0%, transparent 60%);
    animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.3; }
}

.login-container {
    width: 100%;
    max-width: 440px;
    position: relative;
    z-index: 1;
}

.login-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-10);
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-logo {
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.login-logo img {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.login-logo h1 {
    font-size: 1.5rem;
    margin-top: var(--spacing-4);
    margin-bottom: var(--spacing-1);
}

.login-logo p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.login-footer {
    text-align: center;
    margin-top: var(--spacing-8);
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--border-light);
}

.login-footer p {
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* ============================================================================
   LAYOUT - SIDEBAR
   ============================================================================ */
.app-wrapper {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: linear-gradient(180deg, var(--gray-900) 0%, #0f172a 100%);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    transition: width var(--transition-slow);
    z-index: 1000;
    overflow: hidden;
}

.sidebar-header {
    padding: var(--spacing-6);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.sidebar-logo {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--purple-500) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.sidebar-brand {
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-brand h2 {
    color: white;
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0;
    line-height: 1.2;
}

.sidebar-brand span {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.5);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-4);
}

.sidebar-nav::-webkit-scrollbar {
    width: 4px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: var(--radius-full);
}

.nav-section {
    margin-bottom: var(--spacing-6);
}

.nav-section-title {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: rgba(255,255,255,0.4);
    padding: var(--spacing-2) var(--spacing-3);
    margin-bottom: var(--spacing-2);
}

.nav-item {
    margin-bottom: var(--spacing-1);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
    color: rgba(255,255,255,0.7);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: white;
    background: rgba(255,255,255,0.1);
}

.nav-link.active {
    color: white;
    background: linear-gradient(90deg, var(--primary-600) 0%, var(--primary-500) 100%);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.nav-link i {
    font-size: 1.125rem;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

.nav-link .badge {
    margin-left: auto;
    font-size: 0.7rem;
    padding: 0.2em 0.6em;
}

.nav-submenu {
    display: none;
    padding-left: var(--spacing-10);
    margin-top: var(--spacing-1);
}

.nav-item.open > .nav-submenu {
    display: block;
}

.nav-submenu .nav-link {
    padding: var(--spacing-2) var(--spacing-3);
    font-size: 0.8125rem;
}

/* ============================================================================
   LAYOUT - MAIN CONTENT
   ============================================================================ */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-slow);
}

.top-header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-6);
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.sidebar-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: 0.875rem;
}

.breadcrumb a {
    color: var(--text-muted);
}

.breadcrumb span {
    color: var(--text-muted);
}

.breadcrumb .current {
    color: var(--text-primary);
    font-weight: 500;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.header-action-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    color: var(--text-secondary);
    position: relative;
    transition: all var(--transition-fast);
}

.header-action-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.header-action-btn .badge-dot {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 8px;
    height: 8px;
    background: var(--color-danger);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-primary);
}

.user-dropdown {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-dropdown:hover {
    background: var(--bg-tertiary);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.user-info {
    display: none;
}

@media (min-width: 768px) {
    .user-info {
        display: block;
    }
}

.user-info .name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.user-info .role {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.page-content {
    flex: 1;
    padding: var(--spacing-6);
}

.page-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-6);
}

.page-title {
    margin: 0;
    font-size: 1.5rem;
}

.page-subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: var(--spacing-1);
}

/* ============================================================================
   CARDS
   ============================================================================ */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: var(--spacing-5) var(--spacing-6);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
}

.card-body {
    padding: var(--spacing-6);
}

.card-footer {
    padding: var(--spacing-4) var(--spacing-6);
    border-top: 1px solid var(--border-light);
    background: var(--bg-secondary);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

/* Stat Cards */
.stat-card {
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card .card-body {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    margin-bottom: var(--spacing-2);
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: var(--spacing-3);
}

.stat-trend {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    font-size: 0.8125rem;
    font-weight: 500;
}

.stat-trend.up {
    color: var(--color-success);
}

.stat-trend.down {
    color: var(--color-danger);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.primary {
    background: var(--primary-100);
    color: var(--primary-600);
}

.stat-icon.success {
    background: var(--success-100);
    color: var(--success-600);
}

.stat-icon.warning {
    background: var(--warning-100);
    color: var(--warning-600);
}

.stat-icon.danger {
    background: var(--danger-100);
    color: var(--danger-600);
}

.stat-icon.info {
    background: var(--info-100);
    color: var(--info-600);
}

.stat-icon.purple {
    background: var(--purple-50);
    color: var(--purple-600);
}

/* ============================================================================
   BUTTONS
   ============================================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    font-family: inherit;
    line-height: 1.5;
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-sm {
    padding: 0.4rem 0.875rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
    color: white;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-800) 100%);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.35);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--gray-400);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-500) 0%, var(--success-600) 100%);
    color: white;
}

.btn-success:hover {
    background: linear-gradient(135deg, var(--success-600) 0%, var(--success-700) 100%);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-500) 0%, var(--danger-600) 100%);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-500) 0%, var(--warning-600) 100%);
    color: white;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
}

.btn-icon.btn-sm {
    width: 32px;
    height: 32px;
}

.btn-block {
    width: 100%;
}

/* ============================================================================
   FORM ELEMENTS
   ============================================================================ */
.form-group {
    margin-bottom: var(--spacing-5);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-label .required {
    color: var(--color-danger);
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.9375rem;
    font-family: inherit;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-control:disabled {
    background: var(--bg-tertiary);
    cursor: not-allowed;
}

.form-control.is-invalid {
    border-color: var(--color-danger);
}

.form-control.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.invalid-feedback {
    display: block;
    margin-top: var(--spacing-2);
    font-size: 0.8125rem;
    color: var(--color-danger);
}

.form-text {
    margin-top: var(--spacing-2);
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px 12px;
    padding-right: 2.5rem;
}

.input-group {
    display: flex;
}

.input-group .form-control {
    flex: 1;
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.input-group .btn {
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.input-icon {
    position: relative;
}

.input-icon .form-control {
    padding-left: 2.75rem;
}

.input-icon i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

/* Checkboxes & Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-2);
}

.form-check-input {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-default);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.form-check-input:checked {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.form-check-input[type="radio"] {
    border-radius: var(--radius-full);
}

.form-check-label {
    cursor: pointer;
    font-size: 0.9375rem;
}

/* ============================================================================
   TABLES
   ============================================================================ */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: var(--spacing-4);
    text-align: left;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-light);
}

.table th {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    background: var(--bg-secondary);
}

.table tbody tr:hover {
    background: var(--bg-secondary);
}

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

.table .photo-cell {
    width: 50px;
}

.table .photo-cell img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.table .actions-cell {
    white-space: nowrap;
}

/* ============================================================================
   BADGES
   ============================================================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25em 0.65em;
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1;
    border-radius: var(--radius-full);
}

.badge.bg-primary { background: var(--primary-100); color: var(--primary-700); }
.badge.bg-success { background: var(--success-100); color: var(--success-700); }
.badge.bg-warning { background: var(--warning-100); color: var(--warning-600); }
.badge.bg-danger { background: var(--danger-100); color: var(--danger-600); }
.badge.bg-info { background: var(--info-100); color: var(--info-600); }
.badge.bg-secondary { background: var(--gray-200); color: var(--gray-700); }

/* ============================================================================
   ALERTS
   ============================================================================ */
.alert {
    padding: var(--spacing-4) var(--spacing-5);
    border-radius: var(--radius-lg);
    border-left: 4px solid;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-4);
}

.alert-success {
    background: var(--success-50);
    border-color: var(--success-500);
    color: var(--success-700);
}

.alert-danger {
    background: var(--danger-50);
    border-color: var(--danger-500);
    color: var(--danger-600);
}

.alert-warning {
    background: var(--warning-50);
    border-color: var(--warning-500);
    color: var(--warning-600);
}

.alert-info {
    background: var(--info-50);
    border-color: var(--info-500);
    color: var(--info-600);
}

/* ============================================================================
   GRID SYSTEM
   ============================================================================ */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(-1 * var(--spacing-3));
}

.col {
    flex: 1;
    padding: 0 var(--spacing-3);
}

.col-12 { flex: 0 0 100%; max-width: 100%; padding: 0 var(--spacing-3); }
.col-6 { flex: 0 0 50%; max-width: 50%; padding: 0 var(--spacing-3); }
.col-4 { flex: 0 0 33.333%; max-width: 33.333%; padding: 0 var(--spacing-3); }
.col-3 { flex: 0 0 25%; max-width: 25%; padding: 0 var(--spacing-3); }

.grid {
    display: grid;
    gap: var(--spacing-6);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ============================================================================
   UTILITIES
   ============================================================================ */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--spacing-2); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-6 { margin-top: var(--spacing-6); }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-6 { margin-bottom: var(--spacing-6); }

.p-4 { padding: var(--spacing-4); }
.p-6 { padding: var(--spacing-6); }
.px-4 { padding-left: var(--spacing-4); padding-right: var(--spacing-4); }
.py-4 { padding-top: var(--spacing-4); padding-bottom: var(--spacing-4); }

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.hidden { display: none; }
.block { display: block; }

/* ============================================================================
   QUICK ACTIONS
   ============================================================================ */
.quick-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
}

.quick-action-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quick-action-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.quick-action-btn i {
    font-size: 1rem;
    color: var(--color-primary);
}

/* ============================================================================
   ACTIVITY TIMELINE
   ============================================================================ */
.activity-list {
    list-style: none;
}

.activity-item {
    display: flex;
    gap: var(--spacing-4);
    padding: var(--spacing-4) 0;
    border-bottom: 1px solid var(--border-light);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.875rem;
}

.activity-icon.success { background: var(--success-100); color: var(--success-600); }
.activity-icon.primary { background: var(--primary-100); color: var(--primary-600); }
.activity-icon.warning { background: var(--warning-100); color: var(--warning-600); }
.activity-icon.danger { background: var(--danger-100); color: var(--danger-600); }
.activity-icon.info { background: var(--info-100); color: var(--info-600); }

.activity-content {
    flex: 1;
}

.activity-text {
    font-size: 0.9375rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-1);
}

.activity-meta {
    font-size: 0.8125rem;
    color: var(--text-muted);
    display: flex;
    gap: var(--spacing-3);
}

/* ============================================================================
   EVENTS LIST
   ============================================================================ */
.event-list {
    list-style: none;
}

.event-item {
    display: flex;
    gap: var(--spacing-4);
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    transition: background var(--transition-fast);
}

.event-item:hover {
    background: var(--bg-secondary);
}

.event-date {
    width: 48px;
    height: 48px;
    background: var(--primary-100);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.event-date .day {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--primary-700);
    line-height: 1;
}

.event-date .month {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--primary-600);
}

.event-info {
    flex: 1;
}

.event-title {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-1);
}

.event-time {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* ============================================================================
   RESPONSIVE
   ============================================================================ */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .sidebar-toggle {
        display: flex;
    }
    
    .sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        display: none;
    }
    
    .sidebar-overlay.open {
        display: block;
    }
    
    .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .page-content {
        padding: var(--spacing-4);
    }
    
    .grid-cols-3,
    .grid-cols-2 { grid-template-columns: 1fr; }
    
    .stat-card .card-body {
        flex-direction: column;
        gap: var(--spacing-4);
    }
    
    .stat-icon {
        order: -1;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: var(--spacing-6);
    }
    
    .quick-actions {
        flex-direction: column;
    }
    
    .quick-action-btn {
        width: 100%;
        justify-content: center;
    }
}

/* ============================================================================
   CHARTS CONTAINER
   ============================================================================ */
.chart-container {
    position: relative;
    height: 300px;
}

.chart-container canvas {
    max-width: 100%;
}

/* ============================================================================
   LOADING STATES
   ============================================================================ */
.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-light);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================================================
   DROPDOWN MENU
   ============================================================================ */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 200px;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-fast);
    z-index: 1000;
}

.dropdown.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    font-size: 0.875rem;
    color: var(--text-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
}

.dropdown-item i {
    color: var(--text-muted);
    width: 16px;
}

.dropdown-divider {
    height: 1px;
    background: var(--border-light);
    margin: var(--spacing-2) 0;
}

/* ============================================================================
   MOBILE RESPONSIVENESS
   ============================================================================ */

/* Extra Large Screens (1440px+) */
@media (min-width: 1440px) {
    .page-content {
        padding: var(--spacing-8);
    }
    
    .grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Large Screens (1024px - 1439px) */
@media (max-width: 1439px) {
    .grid-cols-4 { grid-template-columns: repeat(3, 1fr); }
}

/* Tablets and Small Desktops (768px - 1023px) */
@media (max-width: 1023px) {
    :root {
        --sidebar-width: 240px;
        --header-height: 56px;
    }
    
    .sidebar {
        width: var(--sidebar-width);
    }
    
    .main-content {
        margin-left: var(--sidebar-width);
    }
    
    .page-content {
        padding: var(--spacing-5);
    }
    
    .page-title {
        font-size: 1.25rem;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-3);
    }
    
    h1 { font-size: 1.875rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1.125rem; }
    
    .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
    .row .col-4 { flex: 0 0 50%; max-width: 50%; }
    .row .col-md-4 { width: 50% !important; }
    .row .col-md-8 { width: 100% !important; }
    .row .col-md-6 { width: 100% !important; }
    .row .col-5 { width: 100% !important; }
    .row .col-7 { width: 100% !important; }
    
    .card-body {
        padding: var(--spacing-4);
    }
    
    .stat-card .card-body {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
        margin-top: var(--spacing-3);
    }
    
    .table th,
    .table td {
        padding: var(--spacing-3);
        font-size: 0.8125rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.8125rem;
    }
    
    .form-group {
        margin-bottom: var(--spacing-4);
    }
}

/* Medium Devices (481px - 767px) */
@media (max-width: 767px) {
    :root {
        --sidebar-width: 0;
        --header-height: 56px;
    }
    
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        width: 280px;
        max-width: 100%;
        height: 100vh;
        transform: translateX(-100%);
        transition: transform var(--transition-slow);
        z-index: 999;
        border-right: 1px solid var(--border-light);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 998;
    }
    
    .sidebar.active ~ .sidebar-overlay {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
        min-height: calc(100vh - 56px);
    }
    
    .sidebar-toggle {
        display: flex !important;
        align-items: center;
        justify-content: center;
        order: -1;
    }
    
    .top-header {
        height: 56px;
        padding: 0 var(--spacing-3);
        justify-content: space-between;
    }
    
    .page-content {
        padding: var(--spacing-4);
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: var(--spacing-4);
    }
    
    .page-title {
        font-size: 1.25rem;
        margin-bottom: var(--spacing-2);
    }
    
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1.125rem; }
    h4 { font-size: 1rem; }
    
    .grid {
        gap: var(--spacing-4);
    }
    
    .grid-cols-4,
    .grid-cols-3,
    .grid-cols-2 {
        grid-template-columns: 1fr;
    }
    
    .row {
        margin: 0;
        flex-direction: column;
    }
    
    .row .col,
    .row .col-12,
    .row .col-6,
    .row .col-4,
    .row .col-3,
    .row .col-md-4,
    .row .col-md-6,
    .row .col-md-8,
    .row .col-5,
    .row .col-7 {
        flex: 0 0 100%;
        max-width: 100%;
        width: 100% !important;
        padding: 0 !important;
        margin-bottom: var(--spacing-4);
    }
    
    .card {
        border-radius: var(--radius-lg);
    }
    
    .card-header {
        padding: var(--spacing-4) var(--spacing-4);
        flex-direction: column;
        align-items: flex-start;
    }
    
    .card-body {
        padding: var(--spacing-4);
    }
    
    .card-footer {
        padding: var(--spacing-3) var(--spacing-4);
    }
    
    .stat-card .card-body {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
        margin-top: var(--spacing-3);
    }
    
    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .table {
        min-width: 100%;
    }
    
    .table th,
    .table td {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: 0.75rem;
    }
    
    .table-responsive {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        margin-bottom: var(--spacing-4);
    }
    
    .table-responsive table {
        min-width: 100%;
    }
    
    .form-group {
        margin-bottom: var(--spacing-4);
    }
    
    .form-label {
        font-size: 0.8125rem;
        margin-bottom: var(--spacing-1);
    }
    
    .form-control {
        padding: 0.5rem 0.75rem;
        font-size: 1rem;
        border-radius: var(--radius-md);
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .input-group .form-control {
        border-radius: var(--radius-md);
        margin-bottom: var(--spacing-2);
    }
    
    .input-group .btn {
        border-radius: var(--radius-md);
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.8125rem;
        width: 100%;
        margin-bottom: var(--spacing-2);
    }
    
    .btn-sm {
        padding: 0.375rem 0.75rem;
        font-size: 0.75rem;
    }
    
    .btn-lg {
        padding: 0.625rem 1.25rem;
        font-size: 0.9375rem;
    }
    
    .btn-block {
        width: 100%;
    }
    
    .btn-group {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-2);
    }
    
    .btn-group .btn {
        width: 100%;
    }
    
    .quick-actions {
        flex-direction: column;
        gap: var(--spacing-2);
    }
    
    .quick-action-btn {
        width: 100%;
        justify-content: center;
        padding: var(--spacing-3) var(--spacing-4);
    }
    
    .header-right {
        gap: var(--spacing-2);
    }
    
    .header-action-btn {
        width: 36px;
        height: 36px;
    }
    
    .user-avatar {
        width: 32px;
        height: 32px;
    }
    
    .user-dropdown {
        padding: var(--spacing-1) var(--spacing-2);
    }
    
    .dropdown-menu {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        min-width: unset;
        max-height: 50vh;
        overflow-y: auto;
        border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
        z-index: 1001;
    }
    
    .sidebar-nav {
        padding: var(--spacing-3);
    }
    
    .nav-link {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: 0.8125rem;
    }
    
    .nav-section {
        margin-bottom: var(--spacing-4);
    }
    
    .nav-section-title {
        font-size: 0.65rem;
        padding: var(--spacing-2) var(--spacing-3);
    }
    
    .sidebar-brand h2 {
        font-size: 1rem;
    }
    
    .sidebar-brand span {
        font-size: 0.65rem;
    }
    
    .login-page {
        padding: var(--spacing-4);
    }
    
    .login-container {
        max-width: 100%;
    }
    
    .login-card {
        padding: var(--spacing-6);
        border-radius: var(--radius-lg);
    }
    
    .login-logo img {
        width: 60px;
        height: 60px;
    }
    
    .login-logo h1 {
        font-size: 1.25rem;
    }
}

/* Small Devices and Phones (320px - 480px) */
@media (max-width: 480px) {
    :root {
        font-size: 14px;
    }
    
    .sidebar {
        width: 280px;
    }
    
    .page-content {
        padding: var(--spacing-3);
    }
    
    .page-title {
        font-size: 1.125rem;
        margin-bottom: var(--spacing-2);
    }
    
    h1 { font-size: 1.375rem; }
    h2 { font-size: 1.125rem; }
    h3 { font-size: 1rem; }
    h4 { font-size: 0.9375rem; }
    
    .page-header {
        flex-direction: column;
        gap: var(--spacing-2);
        margin-bottom: var(--spacing-3);
    }
    
    .card {
        border-radius: var(--radius-lg);
        margin-bottom: var(--spacing-3);
    }
    
    .card-header {
        padding: var(--spacing-3);
        flex-direction: column;
        align-items: flex-start;
    }
    
    .card-body {
        padding: var(--spacing-3);
    }
    
    .card-footer {
        padding: var(--spacing-2) var(--spacing-3);
    }
    
    .stat-card {
        margin-bottom: var(--spacing-3);
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .stat-icon {
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
    }
    
    .grid {
        gap: var(--spacing-3);
    }
    
    .table {
        font-size: 0.75rem;
    }
    
    .table th,
    .table td {
        padding: var(--spacing-2);
    }
    
    .form-group {
        margin-bottom: var(--spacing-3);
    }
    
    .form-label {
        font-size: 0.75rem;
    }
    
    .form-control {
        padding: 0.5rem 0.625rem;
        font-size: 1rem;
    }
    
    .btn {
        padding: 0.5rem 0.875rem;
        font-size: 0.75rem;
        margin-bottom: var(--spacing-2);
    }
    
    .top-header {
        height: 52px;
        padding: 0 var(--spacing-2);
    }
    
    .sidebar-toggle {
        width: 36px;
        height: 36px;
    }
    
    .header-right {
        gap: var(--spacing-1);
    }
    
    .header-action-btn {
        width: 32px;
        height: 32px;
    }
    
    .user-avatar {
        width: 28px;
        height: 28px;
    }
    
    .user-info {
        display: none !important;
    }
    
    .quick-actions {
        gap: var(--spacing-2);
        margin-bottom: var(--spacing-4);
    }
    
    .quick-action-btn {
        width: 100%;
        padding: var(--spacing-2) var(--spacing-3);
        font-size: 0.75rem;
    }
    
    .nav-link {
        padding: var(--spacing-2) var(--spacing-2);
        font-size: 0.75rem;
    }
    
    .nav-link i {
        font-size: 1rem;
    }
    
    .sidebar-header {
        padding: var(--spacing-4);
    }
    
    .sidebar-logo {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }
    
    .login-card {
        padding: var(--spacing-4);
        border-radius: var(--radius-lg);
    }
    
    .login-header {
        margin-bottom: var(--spacing-6);
    }
    
    .login-logo img {
        width: 50px;
        height: 50px;
    }
    
    .login-logo h1 {
        font-size: 1.125rem;
        margin-top: var(--spacing-3);
    }
    
    .dropdown-menu {
        max-height: 60vh;
    }
    
    .modal {
        width: 100% !important;
        margin: 0 var(--spacing-3) !important;
        border-radius: var(--radius-lg);
    }
    
    .modal-header {
        padding: var(--spacing-4) !important;
    }
    
    .modal-body {
        padding: var(--spacing-4) !important;
    }
    
    .modal-footer {
        padding: var(--spacing-4) !important;
    }
    
    /* Admin-specific responsive adjustments */
    .row .col-md-4,
    .row .col-md-6,
    .row .col-md-8,
    .row .col-5,
    .row .col-7 {
        width: 100% !important;
        padding: 0 !important;
        margin-bottom: var(--spacing-3);
    }
}

/* Extra Small Devices (320px and below) */
@media (max-width: 360px) {
    :root {
        font-size: 13px;
    }
    
    .page-title {
        font-size: 1rem;
    }
    
    h1 { font-size: 1.25rem; }
    h2 { font-size: 1rem; }
    h3 { font-size: 0.9375rem; }
    
    .card {
        margin-bottom: var(--spacing-3);
    }
    
    .card-body {
        padding: var(--spacing-2);
    }
    
    .btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.7rem;
    }
    
    .table th,
    .table td {
        padding: var(--spacing-1);
        font-size: 0.65rem;
    }
    
    .form-control {
        padding: 0.375rem 0.5rem;
    }
    
    .stat-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}
        width: var(--sidebar-width);
    }
    
    .main-content {
        margin-left: var(--sidebar-width);
    }
    
    .page-content {
        padding: var(--spacing-5);
    }
    
    .page-title {
        font-size: 1.25rem;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-3);
    }
    
    h1 { font-size: 1.875rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1.125rem; }
    
    .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
    .row .col-4 { flex: 0 0 50%; max-width: 50%; }
    
    .card-body {
        padding: var(--spacing-4);
    }
    
    .stat-card .card-body {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
        margin-top: var(--spacing-3);
    }
    
    .table th,
    .table td {
        padding: var(--spacing-3);
        font-size: 0.8125rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.8125rem;
    }
    
    .form-group {
        margin-bottom: var(--spacing-4);
    }
}

/* Medium Devices (481px - 767px) */
@media (max-width: 767px) {
    :root {
        --sidebar-width: 0;
        --header-height: 56px;
    }
    
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        width: 280px;
        max-width: 100%;
        height: 100vh;
        transform: translateX(-100%);
        transition: transform var(--transition-slow);
        z-index: 999;
        border-right: 1px solid var(--border-light);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 998;
    }
    
    .sidebar.active ~ .sidebar-overlay {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
        min-height: calc(100vh - 56px);
    }
    
    .sidebar-toggle {
        display: flex !important;
        align-items: center;
        justify-content: center;
        order: -1;
    }
    
    .top-header {
        height: 56px;
        padding: 0 var(--spacing-3);
        justify-content: space-between;
    }
    
    .header-left {
        gap: var(--spacing-2);
        flex: 1;
    }
    
    .breadcrumb {
        display: none;
    }
    
    .page-content {
        padding: var(--spacing-4);
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: var(--spacing-4);
    }
    
    .page-title {
        font-size: 1.25rem;
        margin-bottom: var(--spacing-2);
    }
    
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1.125rem; }
    h4 { font-size: 1rem; }
    
    .grid {
        gap: var(--spacing-4);
    }
    
    .grid-cols-4,
    .grid-cols-3,
    .grid-cols-2 {
        grid-template-columns: 1fr;
    }
    
    .col-12,
    .col-6,
    .col-4,
    .col-3 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    
    .row {
        margin: 0;
    }
    
    .row > [class*='col-'] {
        padding: 0;
        margin-bottom: var(--spacing-4);
    }
    
    .card {
        border-radius: var(--radius-lg);
    }
    
    .card-header {
        padding: var(--spacing-4) var(--spacing-4);
    }
    
    .card-body {
        padding: var(--spacing-4);
    }
    
    .card-footer {
        padding: var(--spacing-3) var(--spacing-4);
    }
    
    .stat-card .card-body {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
        margin-top: var(--spacing-3);
    }
    
    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .table {
        min-width: 100%;
    }
    
    .table th,
    .table td {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: 0.75rem;
    }
    
    .table .photo-cell {
        width: 40px;
    }
    
    .table .photo-cell img {
        width: 32px;
        height: 32px;
    }
    
    .form-group {
        margin-bottom: var(--spacing-4);
    }
    
    .form-label {
        font-size: 0.8125rem;
        margin-bottom: var(--spacing-1);
    }
    
    .form-control {
        padding: 0.5rem 0.75rem;
        font-size: 1rem;
        border-radius: var(--radius-md);
    }
    
    .form-control:focus {
        outline: none;
        border-color: var(--color-primary);
        box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .input-group .form-control {
        border-radius: var(--radius-md);
        margin-bottom: var(--spacing-2);
    }
    
    .input-group .btn {
        border-radius: var(--radius-md);
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.8125rem;
        width: 100%;
        margin-bottom: var(--spacing-2);
    }
    
    .btn-sm {
        padding: 0.375rem 0.75rem;
        font-size: 0.75rem;
    }
    
    .btn-lg {
        padding: 0.625rem 1.25rem;
        font-size: 0.9375rem;
    }
    
    .btn-block {
        width: 100%;
    }
    
    .btn-group {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-2);
    }
    
    .btn-group .btn {
        width: 100%;
    }
    
    .quick-actions {
        flex-direction: column;
        gap: var(--spacing-2);
    }
    
    .quick-action-btn {
        width: 100%;
        justify-content: center;
        padding: var(--spacing-3) var(--spacing-4);
    }
    
    .header-right {
        gap: var(--spacing-2);
    }
    
    .header-action-btn {
        width: 36px;
        height: 36px;
    }
    
    .user-avatar {
        width: 32px;
        height: 32px;
    }
    
    .user-dropdown {
        padding: var(--spacing-1) var(--spacing-2);
    }
    
    .dropdown-menu {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        min-width: unset;
        max-height: 50vh;
        overflow-y: auto;
        border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
        z-index: 1001;
    }
    
    .sidebar-nav {
        padding: var(--spacing-3);
    }
    
    .nav-link {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: 0.8125rem;
    }
    
    .nav-section {
        margin-bottom: var(--spacing-4);
    }
    
    .nav-section-title {
        font-size: 0.65rem;
        padding: var(--spacing-2) var(--spacing-3);
    }
    
    .sidebar-brand h2 {
        font-size: 1rem;
    }
    
    .sidebar-brand span {
        font-size: 0.65rem;
    }
    
    .login-page {
        padding: var(--spacing-4);
    }
    
    .login-container {
        max-width: 100%;
    }
    
    .login-card {
        padding: var(--spacing-6);
        border-radius: var(--radius-lg);
    }
    
    .login-logo img {
        width: 60px;
        height: 60px;
    }
    
    .login-logo h1 {
        font-size: 1.25rem;
    }
}

/* Small Devices and Phones (320px - 480px) */
@media (max-width: 480px) {
    :root {
        font-size: 14px;
    }
    
    .sidebar {
        width: 280px;
    }
    
    .page-content {
        padding: var(--spacing-3);
    }
    
    .page-title {
        font-size: 1.125rem;
        margin-bottom: var(--spacing-2);
    }
    
    h1 { font-size: 1.375rem; }
    h2 { font-size: 1.125rem; }
    h3 { font-size: 1rem; }
    h4 { font-size: 0.9375rem; }
    
    .page-header {
        flex-direction: column;
        gap: var(--spacing-2);
        margin-bottom: var(--spacing-3);
    }
    
    .card {
        border-radius: var(--radius-lg);
        margin-bottom: var(--spacing-3);
    }
    
    .card-header {
        padding: var(--spacing-3);
        flex-direction: column;
        align-items: flex-start;
    }
    
    .card-body {
        padding: var(--spacing-3);
    }
    
    .card-footer {
        padding: var(--spacing-2) var(--spacing-3);
    }
    
    .stat-card {
        margin-bottom: var(--spacing-3);
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .stat-icon {
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
    }
    
    .grid {
        gap: var(--spacing-3);
    }
    
    .table {
        font-size: 0.75rem;
    }
    
    .table th,
    .table td {
        padding: var(--spacing-2);
    }
    
    .form-group {
        margin-bottom: var(--spacing-3);
    }
    
    .form-label {
        font-size: 0.75rem;
    }
    
    .form-control {
        padding: 0.5rem 0.625rem;
        font-size: 1rem;
    }
    
    .btn {
        padding: 0.5rem 0.875rem;
        font-size: 0.75rem;
        margin-bottom: var(--spacing-2);
    }
    
    .top-header {
        height: 52px;
        padding: 0 var(--spacing-2);
    }
    
    .sidebar-toggle {
        width: 36px;
        height: 36px;
    }
    
    .header-right {
        gap: var(--spacing-1);
    }
    
    .header-action-btn {
        width: 32px;
        height: 32px;
    }
    
    .user-avatar {
        width: 28px;
        height: 28px;
    }
    
    .user-info {
        display: none !important;
    }
    
    .quick-actions {
        gap: var(--spacing-2);
        margin-bottom: var(--spacing-4);
    }
    
    .quick-action-btn {
        width: 100%;
        padding: var(--spacing-2) var(--spacing-3);
        font-size: 0.75rem;
    }
    
    .nav-link {
        padding: var(--spacing-2) var(--spacing-2);
        font-size: 0.75rem;
    }
    
    .nav-link i {
        font-size: 1rem;
    }
    
    .sidebar-header {
        padding: var(--spacing-4);
    }
    
    .sidebar-logo {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }
    
    .login-card {
        padding: var(--spacing-4);
        border-radius: var(--radius-lg);
    }
    
    .login-header {
        margin-bottom: var(--spacing-6);
    }
    
    .login-logo img {
        width: 50px;
        height: 50px;
    }
    
    .login-logo h1 {
        font-size: 1.125rem;
        margin-top: var(--spacing-3);
    }
    
    .dropdown-menu {
        max-height: 60vh;
    }
    
    .modal {
        width: 100% !important;
        margin: 0 var(--spacing-3) !important;
        border-radius: var(--radius-lg);
    }
    
    .modal-header {
        padding: var(--spacing-4) !important;
    }
    
    .modal-body {
        padding: var(--spacing-4) !important;
    }
    
    .modal-footer {
        padding: var(--spacing-4) !important;
    }
}

/* Extra Small Devices (320px and below) */
@media (max-width: 360px) {
    :root {
        font-size: 13px;
    }
    
    .page-title {
        font-size: 1rem;
    }
    
    h1 { font-size: 1.25rem; }
    h2 { font-size: 1rem; }
    h3 { font-size: 0.9375rem; }
    
    .card {
        margin-bottom: var(--spacing-3);
    }
    
    .card-body {
        padding: var(--spacing-2);
    }
    
    .btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.7rem;
    }
    
    .table th,
    .table td {
        padding: var(--spacing-1);
        font-size: 0.65rem;
    }
    
    .form-control {
        padding: 0.375rem 0.5rem;
    }
    
    .stat-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

/* ============================================================================
   PRINT STYLES
   ============================================================================ */
@media print {
    .sidebar,
    .sidebar-overlay,
    .top-header,
    .quick-actions,
    .btn {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
    }
    
    .page-content {
        padding: 0 !important;
    }
    
    .card {
        break-inside: avoid;
        box-shadow: none !important;
        border: 1px solid #ddd !important;
        page-break-inside: avoid;
    }
}