/**
 * Enhanced Frontend Design System - SaralStudy
 * Modern, responsive, and accessible design system
 * Version: 3.0
 */

/* =============================================
   CSS CUSTOM PROPERTIES
   ============================================= */
:root {
    /* Brand Colors */
    --saral-primary: #667eea;
    --saral-primary-dark: #5a6fd8;
    --saral-primary-light: #7c8fea;
    --saral-secondary: #764ba2;
    --saral-secondary-dark: #6a4190;
    --saral-secondary-light: #8459b4;
    
    /* Semantic Colors */
    --saral-success: #10b981;
    --saral-success-dark: #059669;
    --saral-success-light: #34d399;
    --saral-warning: #f59e0b;
    --saral-warning-dark: #d97706;
    --saral-warning-light: #fbbf24;
    --saral-danger: #ef4444;
    --saral-danger-dark: #dc2626;
    --saral-danger-light: #f87171;
    --saral-info: #3b82f6;
    --saral-info-dark: #2563eb;
    --saral-info-light: #60a5fa;
    
    /* Educational Colors */
    --saral-math: #dc2626;
    --saral-science: #059669;
    --saral-social: #7c3aed;
    --saral-english: #0891b2;
    --saral-hindi: #ea580c;
    --saral-physics: #1e40af;
    --saral-chemistry: #166534;
    --saral-biology: #be123c;
    
    /* Neutral Colors */
    --saral-white: #ffffff;
    --saral-gray-50: #f9fafb;
    --saral-gray-100: #f3f4f6;
    --saral-gray-200: #e5e7eb;
    --saral-gray-300: #d1d5db;
    --saral-gray-400: #9ca3af;
    --saral-gray-500: #6b7280;
    --saral-gray-600: #4b5563;
    --saral-gray-700: #374151;
    --saral-gray-800: #1f2937;
    --saral-gray-900: #111827;
    
    /* Typography */
    --saral-font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --saral-font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    
    --saral-text-xs: 0.75rem;
    --saral-text-sm: 0.875rem;
    --saral-text-base: 1rem;
    --saral-text-lg: 1.125rem;
    --saral-text-xl: 1.25rem;
    --saral-text-2xl: 1.5rem;
    --saral-text-3xl: 1.875rem;
    --saral-text-4xl: 2.25rem;
    --saral-text-5xl: 3rem;
    --saral-text-6xl: 3.75rem;
    
    --saral-font-light: 300;
    --saral-font-normal: 400;
    --saral-font-medium: 500;
    --saral-font-semibold: 600;
    --saral-font-bold: 700;
    --saral-font-extrabold: 800;
    
    --saral-leading-tight: 1.25;
    --saral-leading-normal: 1.5;
    --saral-leading-relaxed: 1.75;
    
    /* Spacing */
    --saral-space-1: 0.25rem;
    --saral-space-2: 0.5rem;
    --saral-space-3: 0.75rem;
    --saral-space-4: 1rem;
    --saral-space-5: 1.25rem;
    --saral-space-6: 1.5rem;
    --saral-space-8: 2rem;
    --saral-space-10: 2.5rem;
    --saral-space-12: 3rem;
    --saral-space-16: 4rem;
    --saral-space-20: 5rem;
    --saral-space-24: 6rem;
    --saral-space-32: 8rem;
    
    /* Border Radius */
    --saral-radius-sm: 0.25rem;
    --saral-radius: 0.5rem;
    --saral-radius-md: 0.75rem;
    --saral-radius-lg: 1rem;
    --saral-radius-xl: 1.5rem;
    --saral-radius-2xl: 2rem;
    --saral-radius-3xl: 3rem;
    --saral-radius-full: 9999px;
    
    /* Shadows */
    --saral-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --saral-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --saral-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --saral-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --saral-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --saral-shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --saral-shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    
    /* Transitions */
    --saral-transition-fast: 0.15s ease;
    --saral-transition: 0.3s ease;
    --saral-transition-slow: 0.5s ease;
    --saral-transition-bounce: 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Z-Index Scale */
    --saral-z-dropdown: 1000;
    --saral-z-sticky: 1020;
    --saral-z-fixed: 1030;
    --saral-z-modal-backdrop: 1040;
    --saral-z-modal: 1050;
    --saral-z-popover: 1060;
    --saral-z-tooltip: 1070;
    --saral-z-toast: 9999;
    
    /* Breakpoints */
    --saral-breakpoint-sm: 640px;
    --saral-breakpoint-md: 768px;
    --saral-breakpoint-lg: 1024px;
    --saral-breakpoint-xl: 1280px;
    --saral-breakpoint-2xl: 1536px;
}

/* =============================================
   BASE STYLES
   ============================================= */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--saral-font-family);
    font-size: var(--saral-text-base);
    line-height: var(--saral-leading-normal);
    color: var(--saral-gray-900);
    background-color: var(--saral-gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* =============================================
   ENHANCED COMPONENTS
   ============================================= */

/* Enhanced Header */
.saral-header {
    background: white;
    border-bottom: 1px solid var(--saral-gray-200);
    position: sticky;
    top: 0;
    z-index: var(--saral-z-sticky);
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.95);
    transition: all var(--saral-transition);
}

.saral-header.scrolled {
    box-shadow: var(--saral-shadow-md);
}

.saral-header-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--saral-space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.saral-logo {
    display: flex;
    align-items: center;
    gap: var(--saral-space-3);
    text-decoration: none;
    color: var(--saral-gray-900);
    font-weight: var(--saral-font-bold);
    font-size: var(--saral-text-xl);
}

.saral-logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--saral-primary), var(--saral-secondary));
    border-radius: var(--saral-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--saral-font-bold);
    font-size: var(--saral-text-lg);
}

.saral-nav {
    display: flex;
    align-items: center;
    gap: var(--saral-space-8);
}

.saral-nav-link {
    color: var(--saral-gray-700);
    text-decoration: none;
    font-weight: var(--saral-font-medium);
    padding: var(--saral-space-2) var(--saral-space-4);
    border-radius: var(--saral-radius-lg);
    transition: all var(--saral-transition-fast);
    position: relative;
}

.saral-nav-link:hover {
    color: var(--saral-primary);
    background: var(--saral-gray-50);
}

.saral-nav-link.active {
    color: var(--saral-primary);
}

.saral-nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--saral-primary);
    border-radius: var(--saral-radius-full);
}

/* Enhanced Search */
.saral-search-container {
    position: relative;
    width: 400px;
}

.saral-search-input {
    width: 100%;
    padding: var(--saral-space-3) var(--saral-space-4) var(--saral-space-3) var(--saral-space-12);
    border: 2px solid var(--saral-gray-200);
    border-radius: var(--saral-radius-2xl);
    font-size: var(--saral-text-sm);
    transition: all var(--saral-transition-fast);
    background: var(--saral-gray-50);
}

.saral-search-input:focus {
    outline: none;
    border-color: var(--saral-primary);
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.saral-search-icon {
    position: absolute;
    left: var(--saral-space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--saral-gray-400);
    pointer-events: none;
}

.saral-search-suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 1px solid var(--saral-gray-200);
    border-radius: var(--saral-radius-xl);
    box-shadow: var(--saral-shadow-lg);
    margin-top: var(--saral-space-2);
    max-height: 400px;
    overflow-y: auto;
    z-index: var(--saral-z-dropdown);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--saral-transition-fast);
}

.saral-search-suggestions.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.saral-search-suggestion-item {
    padding: var(--saral-space-3) var(--saral-space-4);
    border-bottom: 1px solid var(--saral-gray-100);
    cursor: pointer;
    transition: background var(--saral-transition-fast);
}

.saral-search-suggestion-item:hover {
    background: var(--saral-gray-50);
}

.saral-search-suggestion-item:last-child {
    border-bottom: none;
}

/* Enhanced Hero Section */
.saral-hero {
    background: linear-gradient(135deg, var(--saral-primary) 0%, var(--saral-secondary) 100%);
    color: white;
    padding: var(--saral-space-20) 0;
    position: relative;
    overflow: hidden;
}

.saral-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="60" height="60" viewBox="0 0 60 60" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="%23ffffff" fill-opacity="0.1"><circle cx="30" cy="30" r="4"/></g></svg>') repeat;
    opacity: 0.3;
}

.saral-hero-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--saral-space-4);
    position: relative;
    z-index: 1;
    text-align: center;
}

.saral-hero-title {
    font-size: var(--saral-text-5xl);
    font-weight: var(--saral-font-bold);
    margin-bottom: var(--saral-space-6);
    line-height: var(--saral-leading-tight);
    background: linear-gradient(135deg, #ffffff 0%, rgba(255,255,255,0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.saral-hero-subtitle {
    font-size: var(--saral-text-xl);
    margin-bottom: var(--saral-space-8);
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: var(--saral-leading-relaxed);
}

.saral-hero-search {
    max-width: 600px;
    margin: 0 auto var(--saral-space-12);
    position: relative;
}

.saral-hero-search-input {
    width: 100%;
    padding: var(--saral-space-4) var(--saral-space-6);
    border: none;
    border-radius: var(--saral-radius-3xl);
    font-size: var(--saral-text-lg);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    transition: all var(--saral-transition);
    box-shadow: var(--saral-shadow-xl);
}

.saral-hero-search-input:focus {
    outline: none;
    transform: translateY(-2px);
    box-shadow: var(--saral-shadow-2xl);
}

.saral-hero-search-input::placeholder {
    color: var(--saral-gray-500);
}

.saral-hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--saral-space-8);
    max-width: 1000px;
    margin: 0 auto;
}

.saral-hero-stat {
    text-align: center;
}

.saral-hero-stat-number {
    font-size: var(--saral-text-4xl);
    font-weight: var(--saral-font-bold);
    margin-bottom: var(--saral-space-2);
    display: block;
}

.saral-hero-stat-label {
    font-size: var(--saral-text-lg);
    opacity: 0.8;
}

/* Enhanced Cards */
.saral-card {
    background: white;
    border-radius: var(--saral-radius-2xl);
    box-shadow: var(--saral-shadow);
    overflow: hidden;
    transition: all var(--saral-transition);
    position: relative;
}

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

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

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

.saral-card-header {
    padding: var(--saral-space-6);
    border-bottom: 1px solid var(--saral-gray-100);
}

.saral-card-title {
    font-size: var(--saral-text-xl);
    font-weight: var(--saral-font-semibold);
    color: var(--saral-gray-900);
    margin: 0 0 var(--saral-space-2) 0;
}

.saral-card-subtitle {
    font-size: var(--saral-text-sm);
    color: var(--saral-gray-500);
    margin: 0;
}

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

.saral-card-footer {
    padding: var(--saral-space-6);
    border-top: 1px solid var(--saral-gray-100);
    background: var(--saral-gray-50);
}

/* Enhanced Buttons */
.saral-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--saral-space-2);
    padding: var(--saral-space-3) var(--saral-space-6);
    border: none;
    border-radius: var(--saral-radius-lg);
    font-size: var(--saral-text-sm);
    font-weight: var(--saral-font-medium);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--saral-transition-fast);
    position: relative;
    overflow: hidden;
}

.saral-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(--saral-transition-slow);
}

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

.saral-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.saral-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.saral-btn-primary {
    background: linear-gradient(135deg, var(--saral-primary), var(--saral-secondary));
    color: white;
}

.saral-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--saral-shadow-lg);
}

.saral-btn-secondary {
    background: var(--saral-gray-200);
    color: var(--saral-gray-900);
}

.saral-btn-secondary:hover {
    background: var(--saral-gray-300);
    transform: translateY(-1px);
}

.saral-btn-outline {
    background: transparent;
    color: var(--saral-primary);
    border: 2px solid var(--saral-primary);
}

.saral-btn-outline:hover {
    background: var(--saral-primary);
    color: white;
    transform: translateY(-1px);
}

.saral-btn-sm {
    padding: var(--saral-space-2) var(--saral-space-4);
    font-size: var(--saral-text-xs);
}

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

/* Enhanced Grid System */
.saral-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--saral-space-4);
}

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

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

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

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

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

/* Enhanced Subject Cards */
.saral-subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--saral-space-6);
}

.saral-subject-card {
    background: white;
    border-radius: var(--saral-radius-2xl);
    padding: var(--saral-space-6);
    box-shadow: var(--saral-shadow);
    transition: all var(--saral-transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.saral-subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--subject-color, var(--saral-primary)), var(--subject-color-dark, var(--saral-primary-dark)));
    opacity: 0;
    transition: opacity var(--saral-transition);
}

.saral-subject-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: var(--saral-shadow-2xl);
}

.saral-subject-card:hover::before {
    opacity: 0.1;
}

.saral-subject-card:hover .saral-subject-icon {
    transform: scale(1.1) rotate(5deg);
}

.saral-subject-card:hover .saral-subject-title {
    color: var(--subject-color, var(--saral-primary));
}

.saral-subject-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--saral-radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--saral-text-2xl);
    color: white;
    margin-bottom: var(--saral-space-4);
    background: linear-gradient(135deg, var(--subject-color, var(--saral-primary)), var(--subject-color-dark, var(--saral-primary-dark)));
    transition: all var(--saral-transition-bounce);
}

.saral-subject-title {
    font-size: var(--saral-text-xl);
    font-weight: var(--saral-font-semibold);
    color: var(--saral-gray-900);
    margin-bottom: var(--saral-space-2);
    transition: color var(--saral-transition);
}

.saral-subject-description {
    font-size: var(--saral-text-sm);
    color: var(--saral-gray-600);
    line-height: var(--saral-leading-normal);
}

.saral-subject-stats {
    display: flex;
    gap: var(--saral-space-4);
    margin-top: var(--saral-space-4);
    padding-top: var(--saral-space-4);
    border-top: 1px solid var(--saral-gray-100);
}

.saral-subject-stat {
    display: flex;
    align-items: center;
    gap: var(--saral-space-1);
    font-size: var(--saral-text-xs);
    color: var(--saral-gray-500);
}

/* Enhanced Class Navigation */
.saral-class-nav {
    background: white;
    border-radius: var(--saral-radius-2xl);
    padding: var(--saral-space-6);
    box-shadow: var(--saral-shadow);
    margin-bottom: var(--saral-space-8);
}

.saral-class-nav-title {
    font-size: var(--saral-text-2xl);
    font-weight: var(--saral-font-bold);
    color: var(--saral-gray-900);
    margin-bottom: var(--saral-space-6);
    text-align: center;
}

.saral-class-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--saral-space-4);
}

.saral-class-item {
    display: flex;
    align-items: center;
    gap: var(--saral-space-3);
    padding: var(--saral-space-4);
    border-radius: var(--saral-radius-xl);
    text-decoration: none;
    color: var(--saral-gray-700);
    transition: all var(--saral-transition);
    border: 2px solid transparent;
}

.saral-class-item:hover {
    background: var(--saral-gray-50);
    border-color: var(--saral-primary);
    transform: translateY(-2px);
}

.saral-class-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--saral-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--saral-primary), var(--saral-secondary));
    color: white;
    font-weight: var(--saral-font-bold);
    font-size: var(--saral-text-sm);
    flex-shrink: 0;
}

.saral-class-info {
    flex: 1;
}

.saral-class-name {
    font-weight: var(--saral-font-semibold);
    color: var(--saral-gray-900);
    margin-bottom: var(--saral-space-1);
}

.saral-class-description {
    font-size: var(--saral-text-xs);
    color: var(--saral-gray-500);
}

/* Enhanced Features Section */
.saral-features {
    padding: var(--saral-space-16) 0;
    background: var(--saral-gray-50);
}

.saral-features-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--saral-space-4);
}

.saral-features-header {
    text-align: center;
    margin-bottom: var(--saral-space-12);
}

.saral-features-title {
    font-size: var(--saral-text-4xl);
    font-weight: var(--saral-font-bold);
    color: var(--saral-gray-900);
    margin-bottom: var(--saral-space-4);
}

.saral-features-subtitle {
    font-size: var(--saral-text-xl);
    color: var(--saral-gray-600);
    max-width: 600px;
    margin: 0 auto;
}

.saral-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--saral-space-8);
}

.saral-feature-card {
    background: white;
    border-radius: var(--saral-radius-2xl);
    padding: var(--saral-space-8);
    box-shadow: var(--saral-shadow);
    transition: all var(--saral-transition);
    text-align: center;
}

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

.saral-feature-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--saral-radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--saral-text-3xl);
    color: white;
    margin: 0 auto var(--saral-space-6);
    background: linear-gradient(135deg, var(--feature-color, var(--saral-primary)), var(--feature-color-dark, var(--saral-primary-dark)));
}

.saral-feature-title {
    font-size: var(--saral-text-2xl);
    font-weight: var(--saral-font-semibold);
    color: var(--saral-gray-900);
    margin-bottom: var(--saral-space-4);
}

.saral-feature-description {
    font-size: var(--saral-text-base);
    color: var(--saral-gray-600);
    line-height: var(--saral-leading-relaxed);
}

/* Enhanced Testimonials */
.saral-testimonials {
    padding: var(--saral-space-16) 0;
    background: linear-gradient(135deg, var(--saral-primary) 0%, var(--saral-secondary) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.saral-testimonials::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="40" height="40" viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="%23ffffff" fill-opacity="0.1"><circle cx="20" cy="20" r="3"/></g></svg>') repeat;
    opacity: 0.3;
}

.saral-testimonials-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--saral-space-4);
    position: relative;
    z-index: 1;
}

.saral-testimonials-header {
    text-align: center;
    margin-bottom: var(--saral-space-12);
}

.saral-testimonials-title {
    font-size: var(--saral-text-4xl);
    font-weight: var(--saral-font-bold);
    margin-bottom: var(--saral-space-4);
}

.saral-testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--saral-space-8);
}

.saral-testimonial-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--saral-radius-2xl);
    padding: var(--saral-space-6);
    transition: all var(--saral-transition);
}

.saral-testimonial-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.15);
}

.saral-testimonial-rating {
    display: flex;
    gap: var(--saral-space-1);
    margin-bottom: var(--saral-space-4);
    color: #fbbf24;
}

.saral-testimonial-text {
    font-size: var(--saral-text-lg);
    line-height: var(--saral-leading-relaxed);
    margin-bottom: var(--saral-space-6);
    font-style: italic;
}

.saral-testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--saral-space-3);
}

.saral-testimonial-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--saral-radius-full);
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--saral-font-bold);
    color: white;
}

.saral-testimonial-info {
    flex: 1;
}

.saral-testimonial-name {
    font-weight: var(--saral-font-semibold);
    margin-bottom: var(--saral-space-1);
}

.saral-testimonial-role {
    font-size: var(--saral-text-sm);
    opacity: 0.8;
}

/* Enhanced Footer */
.saral-footer {
    background: var(--saral-gray-900);
    color: white;
    padding: var(--saral-space-16) 0 var(--saral-space-8);
}

.saral-footer-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--saral-space-4);
}

.saral-footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--saral-space-8);
    margin-bottom: var(--saral-space-12);
}

.saral-footer-section h3 {
    font-size: var(--saral-text-lg);
    font-weight: var(--saral-font-semibold);
    margin-bottom: var(--saral-space-4);
    color: white;
}

.saral-footer-links {
    list-style: none;
    padding: 0;
}

.saral-footer-links li {
    margin-bottom: var(--saral-space-2);
}

.saral-footer-links a {
    color: var(--saral-gray-400);
    text-decoration: none;
    transition: color var(--saral-transition);
}

.saral-footer-links a:hover {
    color: white;
}

.saral-footer-bottom {
    border-top: 1px solid var(--saral-gray-700);
    padding-top: var(--saral-space-8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--saral-space-4);
}

.saral-footer-copyright {
    color: var(--saral-gray-400);
    font-size: var(--saral-text-sm);
}

.saral-footer-social {
    display: flex;
    gap: var(--saral-space-4);
}

.saral-footer-social a {
    width: 40px;
    height: 40px;
    border-radius: var(--saral-radius-full);
    background: var(--saral-gray-700);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all var(--saral-transition);
}

.saral-footer-social a:hover {
    background: var(--saral-primary);
    transform: translateY(-2px);
}

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */

/* Mobile */
@media (max-width: 640px) {
    .saral-header-container {
        padding: 0 var(--saral-space-3);
    }
    
    .saral-nav {
        display: none;
    }
    
    .saral-search-container {
        width: 100%;
    }
    
    .saral-hero-title {
        font-size: var(--saral-text-3xl);
    }
    
    .saral-hero-subtitle {
        font-size: var(--saral-text-lg);
    }
    
    .saral-hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--saral-space-4);
    }
    
    .saral-grid-cols-1,
    .saral-grid-cols-2,
    .saral-grid-cols-3,
    .saral-grid-cols-4 {
        grid-template-columns: 1fr;
    }
    
    .saral-subject-grid {
        grid-template-columns: 1fr;
    }
    
    .saral-class-grid {
        grid-template-columns: 1fr;
    }
    
    .saral-features-grid {
        grid-template-columns: 1fr;
    }
    
    .saral-testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .saral-footer-grid {
        grid-template-columns: 1fr;
        gap: var(--saral-space-6);
    }
    
    .saral-footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* Tablet */
@media (min-width: 641px) and (max-width: 1024px) {
    .saral-subject-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .saral-class-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .saral-features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .saral-testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* =============================================
   ANIMATIONS
   ============================================= */

@keyframes saral-fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes saral-slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes saral-bounce {
    0%, 20%, 53%, 80%, 100% {
        transform: translate3d(0, 0, 0);
    }
    40%, 43% {
        transform: translate3d(0, -30px, 0);
    }
    70% {
        transform: translate3d(0, -15px, 0);
    }
    90% {
        transform: translate3d(0, -4px, 0);
    }
}

@keyframes saral-pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(102, 126, 234, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(102, 126, 234, 0);
    }
}

.saral-animate-fadeInUp {
    animation: saral-fadeInUp 0.6s ease-out;
}

.saral-animate-slideInLeft {
    animation: saral-slideInLeft 0.6s ease-out;
}

.saral-animate-bounce {
    animation: saral-bounce 1s ease-in-out;
}

.saral-animate-pulse {
    animation: saral-pulse 2s infinite;
}

/* =============================================
   UTILITY CLASSES
   ============================================= */

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

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

.saral-bg-primary { background: var(--saral-primary); }
.saral-bg-secondary { background: var(--saral-secondary); }
.saral-bg-success { background: var(--saral-success); }
.saral-bg-warning { background: var(--saral-warning); }
.saral-bg-danger { background: var(--saral-danger); }
.saral-bg-info { background: var(--saral-info); }

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

.saral-rounded-sm { border-radius: var(--saral-radius-sm); }
.saral-rounded { border-radius: var(--saral-radius); }
.saral-rounded-md { border-radius: var(--saral-radius-md); }
.saral-rounded-lg { border-radius: var(--saral-radius-lg); }
.saral-rounded-xl { border-radius: var(--saral-radius-xl); }
.saral-rounded-2xl { border-radius: var(--saral-radius-2xl); }
.saral-rounded-full { border-radius: var(--saral-radius-full); }

/* =============================================
   ACCESSIBILITY
   ============================================= */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

.saral-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for better accessibility */
.saral-btn:focus-visible,
.saral-nav-link:focus-visible,
.saral-card:focus-visible {
    outline: 2px solid var(--saral-primary);
    outline-offset: 2px;
}

/* =============================================
   PRINT STYLES
   ============================================= */

@media print {
    .saral-header,
    .saral-footer,
    .saral-hero-search,
    .saral-btn {
        display: none !important;
    }
    
    .saral-hero {
        background: white !important;
        color: black !important;
        padding: var(--saral-space-8) 0 !important;
    }
    
    .saral-card {
        box-shadow: none !important;
        border: 1px solid var(--saral-gray-300) !important;
        break-inside: avoid;
    }
    
    .saral-text-gradient {
        background: none !important;
        -webkit-text-fill-color: black !important;
        color: black !important;
    }
}