/**
 * Enterprise Project Management System
 * Modern Professional CSS Framework
 */

/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-x: hidden;
}

/* Modern CSS Variables */
:root {
    /* Primary Brand Colors */
    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-200: #bae6fd;
    --primary-300: #7dd3fc;
    --primary-400: #38bdf8;
    --primary-500: #0ea5e9;
    --primary-600: #0284c7;
    --primary-700: #0369a1;
    --primary-800: #075985;
    --primary-900: #0c4a6e;

    /* Secondary Colors */
    --secondary-50: #f8fafc;
    --secondary-100: #f1f5f9;
    --secondary-200: #e2e8f0;
    --secondary-300: #cbd5e1;
    --secondary-400: #94a3b8;
    --secondary-500: #64748b;
    --secondary-600: #475569;
    --secondary-700: #334155;
    --secondary-800: #1e293b;
    --secondary-900: #0f172a;

    /* Success Colors */
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-200: #bbf7d0;
    --success-300: #86efac;
    --success-400: #4ade80;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;
    --success-800: #166534;
    --success-900: #14532d;

    /* Warning Colors */
    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-200: #fde68a;
    --warning-300: #fcd34d;
    --warning-400: #fbbf24;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --warning-700: #b45309;
    --warning-800: #92400e;
    --warning-900: #78350f;

    /* Error Colors */
    --error-50: #fef2f2;
    --error-100: #fee2e2;
    --error-200: #fecaca;
    --error-300: #fca5a5;
    --error-400: #f87171;
    --error-500: #ef4444;
    --error-600: #dc2626;
    --error-700: #b91c1c;
    --error-800: #991b1b;
    --error-900: #7f1d1d;

    /* Neutral Grays */
    --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;

    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-tertiary: var(--gray-400);
    --border-primary: var(--gray-200);
    --border-secondary: var(--gray-300);

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Typography Scale */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;

    /* Font Weights */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    /* Line Heights */
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* Border Radius */
    --radius-sm: 0.125rem;
    --radius-base: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: var(--secondary-900);
    --bg-secondary: var(--secondary-800);
    --bg-tertiary: var(--secondary-700);
    --text-primary: var(--gray-100);
    --text-secondary: var(--gray-300);
    --text-tertiary: var(--gray-500);
    --border-primary: var(--secondary-700);
    --border-secondary: var(--secondary-600);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-semibold);
    line-height: var(--leading-tight);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

h1 { font-size: var(--text-4xl); font-weight: var(--font-bold); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

a {
    color: var(--primary-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-700);
}

/* Layout Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--space-6);
}

/* Modern Grid System */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }

/* Modern Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    line-height: 1;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left var(--transition-base);
}

.btn:hover::before {
    left: 100%;
}

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

.btn:disabled::before {
    display: none;
}

/* Button Variants */
.btn-primary {
    color: white;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    border-color: var(--primary-600);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-700), var(--primary-800));
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-tertiary);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-success {
    color: white;
    background: linear-gradient(135deg, var(--success-600), var(--success-700));
    border-color: var(--success-600);
    box-shadow: var(--shadow-sm);
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--success-700), var(--success-800));
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-warning {
    color: white;
    background: linear-gradient(135deg, var(--warning-600), var(--warning-700));
    border-color: var(--warning-600);
    box-shadow: var(--shadow-sm);
}

.btn-warning:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--warning-700), var(--warning-800));
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-danger {
    color: white;
    background: linear-gradient(135deg, var(--error-600), var(--error-700));
    border-color: var(--error-600);
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--error-700), var(--error-800));
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-outline-primary {
    color: var(--primary-600);
    background-color: transparent;
    border-color: var(--primary-600);
}

.btn-outline-primary:hover:not(:disabled) {
    color: white;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
}

.btn-xl {
    padding: var(--space-5) var(--space-10);
    font-size: var(--text-lg);
}

/* Modern Form Components */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: var(--space-4);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    position: relative;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
    transform: translateY(-1px);
}

.form-control:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--bg-secondary);
}

.form-control.is-invalid {
    border-color: var(--error-500);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-control.is-valid {
    border-color: var(--success-500);
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

.form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right var(--space-3) center;
    background-repeat: no-repeat;
    background-size: 16px 12px;
    padding-right: var(--space-10);
}

.form-text {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    margin-top: var(--space-2);
}

.error-message {
    font-size: var(--text-sm);
    color: var(--error-600);
    margin-top: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* Input Group */
.input-group {
    display: flex;
    width: 100%;
    position: relative;
}

.input-group .form-control {
    flex: 1;
    border-radius: 0;
}

.input-group .form-control:first-child {
    border-top-left-radius: var(--radius-lg);
    border-bottom-left-radius: var(--radius-lg);
}

.input-group .form-control:last-child {
    border-top-right-radius: var(--radius-lg);
    border-bottom-right-radius: var(--radius-lg);
}

.input-group-text {
    display: flex;
    align-items: center;
    padding: var(--space-4);
    font-size: var(--text-base);
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.input-group-text:first-child {
    border-top-left-radius: var(--radius-lg);
    border-bottom-left-radius: var(--radius-lg);
    border-right: 0;
}

.input-group-text:last-child {
    border-top-right-radius: var(--radius-lg);
    border-bottom-right-radius: var(--radius-lg);
    border-left: 0;
}

.input-group-text:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Modern Card Component */
.card {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-base);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    opacity: 0;
    transition: opacity var(--transition-fast);
}

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

.card:hover::before {
    opacity: 1;
}

.card-header {
    padding: var(--space-6);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body {
    padding: var(--space-6);
    flex: 1;
}

.card-footer {
    padding: var(--space-6);
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
}

.card-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin: 0;
}

.card-subtitle {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin: var(--space-1) 0 0 0;
}

.card-text {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Modern Alert System */
.alert {
    padding: var(--space-4) var(--space-6);
    margin-bottom: var(--space-4);
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    position: relative;
    overflow: hidden;
}

.alert::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: currentColor;
}

.alert-primary {
    color: var(--primary-800);
    background-color: var(--primary-50);
    border-color: var(--primary-200);
}

.alert-success {
    color: var(--success-800);
    background-color: var(--success-50);
    border-color: var(--success-200);
}

.alert-warning {
    color: var(--warning-800);
    background-color: var(--warning-50);
    border-color: var(--warning-200);
}

.alert-danger {
    color: var(--error-800);
    background-color: var(--error-50);
    border-color: var(--error-200);
}

/* Navigation Components */
.navbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-primary);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.navbar-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    text-decoration: none;
}

.navbar-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin: 0;
}

/* Modern Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--z-fixed);
    width: 280px;
    height: 100vh;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border-right: 1px solid var(--border-primary);
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-xl);
}

.sidebar.show {
    transform: translateX(0);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-6);
    margin-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-primary);
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
}

.sidebar-brand {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: white;
}

.sidebar-nav {
    padding: 0 var(--space-4);
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-nav .nav-item {
    margin-bottom: var(--space-2);
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.sidebar-nav .nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(14, 165, 233, 0.1), transparent);
    transition: left var(--transition-base);
}

.sidebar-nav .nav-link:hover {
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    transform: translateX(4px);
}

.sidebar-nav .nav-link:hover::before {
    left: 100%;
}

.sidebar-nav .nav-link.active {
    color: var(--primary-600);
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    border-left: 4px solid var(--primary-600);
    font-weight: var(--font-medium);
}

.sidebar-nav .nav-link i {
    width: 20px;
    text-align: center;
}

/* Main Content Area */
.main-content {
    margin-left: 0;
    min-height: 100vh;
    transition: margin-left var(--transition-base);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.main-content.sidebar-open {
    margin-left: 280px;
}

/* Dashboard Stats */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.stat-card {
    padding: var(--space-6);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-primary);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
}

.stat-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

.stat-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-2xl);
    margin-bottom: var(--space-4);
    font-size: var(--text-2xl);
    position: relative;
    overflow: hidden;
}

.stat-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, currentColor, transparent);
    opacity: 0.1;
}

.stat-icon.primary { 
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200)); 
    color: var(--primary-600); 
}
.stat-icon.success { 
    background: linear-gradient(135deg, var(--success-100), var(--success-200)); 
    color: var(--success-600); 
}
.stat-icon.warning { 
    background: linear-gradient(135deg, var(--warning-100), var(--warning-200)); 
    color: var(--warning-600); 
}
.stat-icon.danger { 
    background: linear-gradient(135deg, var(--error-100), var(--error-200)); 
    color: var(--error-600); 
}

.stat-value {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: var(--space-2);
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin: 0;
    font-weight: var(--font-medium);
}

/* Authentication Pages */
.auth-page {
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--secondary-50) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    position: relative;
    overflow: hidden;
}

.auth-page::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%230ea5e9' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='4'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    animation: float 20s ease-in-out infinite;
}

.auth-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-width: 1400px;
    width: 100%;
    background: var(--bg-primary);
    border-radius: var(--radius-3xl);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
    border: 1px solid var(--border-primary);
    position: relative;
    z-index: 1;
}

.auth-card {
    padding: var(--space-12);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.auth-logo {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    border-radius: var(--radius-3xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-6);
    font-size: var(--text-3xl);
    color: var(--primary-600);
    position: relative;
    overflow: hidden;
}

.auth-logo::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-500), transparent);
    opacity: 0.1;
}

.auth-title {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    background: linear-gradient(135deg, var(--text-primary), var(--primary-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-subtitle {
    font-size: var(--text-base);
    margin-bottom: 0;
    color: var(--text-secondary);
}

.auth-form .form-group {
    margin-bottom: var(--space-6);
}

.auth-form .form-control {
    padding: var(--space-4);
    font-size: var(--text-base);
    border-radius: var(--radius-xl);
}

.auth-form .btn {
    padding: var(--space-4);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-xl);
}

.auth-sidebar {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
    color: white;
    padding: var(--space-12);
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.auth-sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M20 20c0-11.046-8.954-20-20-20v20h20z'/%3E%3C/g%3E%3C/svg%3E");
}

.auth-sidebar-content {
    position: relative;
    z-index: 1;
}

.auth-sidebar-title {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-6);
    color: white;
}

.auth-sidebar-text {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-8);
    color: rgba(255, 255, 255, 0.9);
}

.auth-features {
    margin-bottom: var(--space-12);
}

.auth-features .feature-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--text-base);
}

.auth-features .feature-item:last-child {
    margin-bottom: 0;
}

.auth-features .feature-item i {
    font-size: var(--text-lg);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    width: 56px;
    height: 56px;
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: var(--z-tooltip);
    box-shadow: var(--shadow-lg);
}

.theme-toggle:hover {
    color: var(--text-primary);
    border-color: var(--border-secondary);
    box-shadow: var(--shadow-xl);
    transform: scale(1.05);
}

/* Dropdown Component */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle {
    position: relative;
    background: none;
    border: none;
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    z-index: var(--z-dropdown);
    display: none;
    min-width: 200px;
    padding: var(--space-2) 0;
    margin: var(--space-2) 0 0;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(10px);
}

.dropdown-menu.show {
    display: block;
    animation: slideDown var(--transition-fast);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
    padding: var(--space-3) var(--space-4);
    clear: both;
    font-weight: var(--font-normal);
    color: var(--text-primary);
    text-align: inherit;
    white-space: nowrap;
    background-color: transparent;
    border: 0;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.dropdown-item:hover {
    background-color: var(--bg-secondary);
    color: var(--primary-600);
    transform: translateX(4px);
}

.dropdown-divider {
    height: 0;
    margin: var(--space-2) 0;
    overflow: hidden;
    border-top: 1px solid var(--border-primary);
}

/* Avatar Component */
.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    color: var(--primary-600);
    font-weight: var(--font-medium);
    overflow: hidden;
    position: relative;
}

.avatar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-500), transparent);
    opacity: 0.1;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-sm { width: 32px; height: 32px; font-size: var(--text-sm); }
.avatar-lg { width: 56px; height: 56px; font-size: var(--text-lg); }
.avatar-xl { width: 80px; height: 80px; font-size: var(--text-2xl); }

/* Utility Classes */
.w-100 { width: 100%; }
.h-100 { height: 100%; }
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-600); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--success-600); }
.text-warning { color: var(--warning-600); }
.text-danger { color: var(--error-600); }
.text-muted { color: var(--text-tertiary); }

.bg-primary { background-color: var(--primary-600); }
.bg-secondary { background-color: var(--bg-secondary); }
.bg-success { background-color: var(--success-600); }
.bg-warning { background-color: var(--warning-600); }
.bg-danger { background-color: var(--error-600); }

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }

.me-3 { margin-right: var(--space-3); }
.ms-2 { margin-left: var(--space-2); }
.ms-auto { margin-left: auto; }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

.fade-in {
    animation: fadeIn var(--transition-base);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .auth-container {
        grid-template-columns: 1fr;
        max-width: 600px;
    }
    
    .auth-sidebar {
        display: none;
    }
    
    .main-content.sidebar-open {
        margin-left: 0;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .dashboard-stats {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .sidebar {
        width: 100%;
    }
    
    .navbar {
        padding: var(--space-3) var(--space-4);
    }
    
    .auth-card {
        padding: var(--space-8);
    }
    
    .auth-logo {
        width: 60px;
        height: 60px;
        font-size: var(--text-2xl);
    }
    
    .auth-title {
        font-size: var(--text-3xl);
    }
    
    .theme-toggle {
        top: var(--space-4);
        right: var(--space-4);
        width: 48px;
        height: 48px;
    }
    
    .stat-card {
        padding: var(--space-4);
    }
    
    .stat-value {
        font-size: var(--text-3xl);
    }
    
    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: var(--text-xl);
    }
}

@media (max-width: 480px) {
    .auth-card {
        padding: var(--space-6);
    }
    
    .auth-title {
        font-size: var(--text-2xl);
    }
    
    .btn {
        padding: var(--space-3) var(--space-5);
    }
    
    .form-control {
        padding: var(--space-3);
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .navbar,
    .btn,
    .theme-toggle {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
    }
    
    .card {
        border: 1px solid #000;
        box-shadow: none;
        page-break-inside: avoid;
    }
    
    body {
        font-size: 12px;
        line-height: 1.4;
        color: #000;
        background: #fff;
    }
}