:root {
    /* Modern color palette using HSL */
    --primary: 220 85% 57%; /* #2563EB */
    --primary-dark: 220 85% 45%; /* #1E40AF */
    --secondary: 220 13% 18%; /* #1F2937 */
    --background: 220 13% 98%; /* #F8FAFC */
    --surface: 0 0% 100%; /* #FFFFFF */
    --text-primary: 220 13% 18%; /* #1F2937 */
    --text-secondary: 220 9% 46%; /* #6B7280 */
    --border: 220 13% 91%; /* #E5E7EB */
    --shadow: 220 43% 11% / 0.1; /* rgba(15, 23, 42, 0.1) */
    --shadow-lg: 220 43% 11% / 0.25; /* rgba(15, 23, 42, 0.25) */
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: hsl(var(--text-primary));
    background-color: hsl(var(--background));
    overflow-x: hidden;
    position: relative;
}

/* Animated Background - Floating Geometric Shapes */
body::before,
body::after {
    content: '';
    position: fixed;
    width: 100vw;
    height: 100vh;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: -1;
}

body::before {
    background-image: 
        radial-gradient(circle at 15% 25%, hsla(300, 70%, 60%, 0.3) 0%, transparent 25%),
        radial-gradient(circle at 85% 75%, hsla(45, 85%, 55%, 0.25) 0%, transparent 30%),
        radial-gradient(circle at 45% 10%, hsla(180, 60%, 50%, 0.2) 0%, transparent 20%),
        radial-gradient(circle at 90% 30%, hsla(120, 70%, 45%, 0.28) 0%, transparent 25%),
        radial-gradient(circle at 20% 80%, hsla(15, 80%, 55%, 0.35) 0%, transparent 35%);
    animation: float1 12s ease-in-out infinite;
}

body::after {
    background-image: 
        radial-gradient(circle at 70% 60%, hsla(270, 60%, 50%, 0.25) 0%, transparent 28%),
        radial-gradient(circle at 25% 45%, hsla(60, 70%, 60%, 0.2) 0%, transparent 22%),
        radial-gradient(circle at 60% 20%, hsla(200, 65%, 45%, 0.3) 0%, transparent 26%),
        radial-gradient(circle at 10% 15%, hsla(340, 75%, 55%, 0.22) 0%, transparent 24%),
        radial-gradient(circle at 80% 85%, hsla(90, 60%, 40%, 0.28) 0%, transparent 30%);
    animation: float2 16s ease-in-out infinite reverse;
}

@keyframes float1 {
    0%, 100% {
        transform: translate(0px, 0px) rotate(0deg) scale(1);
        opacity: 0.7;
    }
    33% {
        transform: translate(-20px, -30px) rotate(120deg) scale(1.1);
        opacity: 0.9;
    }
    66% {
        transform: translate(30px, -10px) rotate(240deg) scale(0.9);
        opacity: 0.5;
    }
}

@keyframes float2 {
    0%, 100% {
        transform: translate(0px, 0px) rotate(0deg) scale(1);
        opacity: 0.6;
    }
    25% {
        transform: translate(25px, 20px) rotate(90deg) scale(1.05);
        opacity: 0.8;
    }
    50% {
        transform: translate(-15px, 35px) rotate(180deg) scale(0.95);
        opacity: 0.4;
    }
    75% {
        transform: translate(-30px, -20px) rotate(270deg) scale(1.08);
        opacity: 0.7;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Navigation */
.navbar {
    background: hsla(var(--surface) / 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid hsl(var(--border));
    transition: all 0.3s ease;
    padding: var(--space-4) 0;
}

.navbar-brand {
    font-weight: 600;
    font-size: var(--font-size-xl);
    color: hsl(var(--primary)) !important;
    text-decoration: none;
}

.navbar-toggler {
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius);
    transition: all 0.3s ease;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 0.2rem hsla(var(--primary) / 0.25);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2833, 37, 41, 0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.nav-link {
    color: hsl(var(--text-secondary)) !important;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    margin: 0 var(--space-2);
    padding: var(--space-2) var(--space-3) !important;
    border-radius: var(--radius);
}

.nav-link:hover {
    color: hsl(var(--primary)) !important;
    background-color: hsl(var(--primary) / 0.1);
    transform: translateY(-2px);
}

@media (max-width: 991.98px) {
    .navbar-collapse {
        background: hsla(var(--surface) / 0.98);
        backdrop-filter: blur(15px);
        border-radius: var(--radius-lg);
        padding: var(--space-4);
        margin-top: var(--space-3);
        border: 1px solid hsl(var(--border));
        box-shadow: 0 10px 25px hsla(var(--shadow-lg));
    }
    
    .nav-link {
        margin: var(--space-1) 0;
        text-align: center;
    }
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: hsla(var(--background) / 0.4);
    position: relative;
    padding: var(--space-16) 0;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, hsla(var(--primary) / 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, hsla(var(--primary) / 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: hsl(var(--text-primary));
    margin-bottom: var(--space-6);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: hsl(var(--text-secondary));
    margin-bottom: var(--space-8);
    font-weight: 400;
}

.hero-cta {
    margin-top: var(--space-8);
}

/* Content Sections */
.content-section {
    padding: var(--space-16) 0;
}

.bg-light {
    background-color: hsla(var(--surface) / 0.4) !important;
    backdrop-filter: blur(5px);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    color: hsl(var(--text-primary));
    margin-bottom: var(--space-4);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: hsl(var(--text-secondary));
    font-weight: 400;
}

/* Link Cards */
.link-card {
    background: hsl(var(--surface));
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid hsl(var(--border));
    box-shadow: 0 1px 3px hsla(var(--shadow));
    min-height: 280px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-self: flex-start;
}

.link-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px hsla(var(--shadow-lg)), 0 10px 10px -5px hsla(var(--shadow));
    border-color: hsl(var(--primary));
}

/* Expandable Cards */
.expandable-card {
    cursor: pointer;
    overflow: hidden;
}

.expandable-card .expand-icon {
    float: right;
    transition: transform 0.3s ease;
    font-size: 0.8em;
    margin-left: var(--space-2);
}

.expandable-card.expanded .expand-icon {
    transform: rotate(180deg);
}

.expandable-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    margin-top: var(--space-4);
}

.expandable-card.expanded .expandable-content {
    max-height: 300px;
}

.expandable-card.expanded {
    position: relative;
    z-index: 10;
}

.referral-list {
    padding: var(--space-4) 0;
    border-top: 1px solid hsl(var(--border));
    margin-top: var(--space-4);
}

.referral-item {
    margin-bottom: var(--space-3);
}

.referral-item:last-child {
    margin-bottom: 0;
}

.referral-link {
    display: flex;
    align-items: center;
    padding: var(--space-3);
    background: hsl(var(--background));
    border-radius: var(--radius);
    text-decoration: none;
    color: hsl(var(--text-primary));
    transition: all 0.3s ease;
    border: 1px solid hsl(var(--border));
}

.referral-link:hover {
    background: hsl(var(--primary));
    color: white;
    transform: translateX(4px);
}

.referral-link span {
    flex: 1;
    text-align: left;
    font-weight: 500;
}



.card-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--primary-dark)));
    color: white;
}

.card-icon i {
    font-size: 1.5rem;
}

.support-icon {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.link-card h5 {
    font-weight: 600;
    color: hsl(var(--text-primary));
    margin-bottom: var(--space-3);
    font-size: var(--font-size-lg);
}

.link-card p {
    color: hsl(var(--text-secondary));
    margin-bottom: var(--space-6);
    font-size: var(--font-size-sm);
}

/* Category Headers */
.category-header {
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 2px solid hsl(var(--border));
}

.category-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--primary-dark)));
    color: white;
    font-size: 1.25rem;
}

.category-header h4 {
    color: hsl(var(--text-primary));
    font-weight: 600;
    font-size: var(--font-size-xl);
}

.category-header p {
    color: hsl(var(--text-secondary));
    font-size: var(--font-size-sm);
}

/* Social Cards */
.social-card {
    text-align: center;
}

.social-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: hsl(var(--text-secondary));
    transition: all 0.3s ease;
    background: hsl(var(--surface));
    border: 1px solid hsl(var(--border));
}

.social-link:hover {
    color: hsl(var(--primary));
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px hsla(var(--shadow-lg));
    border-color: hsl(var(--primary));
}

.social-link i {
    font-size: 2rem;
    margin-bottom: var(--space-2);
}

.social-link span {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Buttons */
.btn {
    font-weight: 500;
    border-radius: var(--radius);
    padding: var(--space-3) var(--space-6);
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--primary-dark)));
    color: white;
    border: 1px solid transparent;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px hsla(var(--primary) / 0.4);
    color: white;
}

.btn-outline-primary {
    background: transparent;
    color: hsl(var(--primary));
    border: 1px solid hsl(var(--primary));
}

.btn-outline-primary:hover {
    background: hsl(var(--primary));
    color: white;
    transform: translateY(-2px);
}

.btn-outline-secondary {
    background: transparent;
    color: hsl(var(--text-secondary));
    border: 1px solid hsl(var(--border));
}

.btn-outline-secondary:hover {
    background: hsl(var(--text-secondary));
    color: white;
    transform: translateY(-2px);
}

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

/* Footer */
.footer {
    background: hsl(var(--surface));
    border-top: 1px solid hsl(var(--border));
    padding: var(--space-8) 0;
    margin-top: var(--space-16);
}

.footer p {
    color: hsl(var(--text-secondary));
    margin: 0;
    font-size: var(--font-size-sm);
}

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

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s ease-out forwards;
    opacity: 0;
}

.slide-up {
    animation: slideUp 0.8s ease-out forwards;
    opacity: 0;
}

/* Hidden sections */
.section-hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .content-section {
        padding: var(--space-12) 0;
    }
    
    .hero-section {
        padding: var(--space-12) 0;
        min-height: 80vh;
    }
    
    .link-card {
        padding: var(--space-6);
    }
    
    .card-icon {
        width: 50px;
        height: 50px;
    }
    
    .card-icon i {
        font-size: 1.25rem;
    }
    
    .social-link {
        padding: var(--space-4);
    }
    
    .social-link i {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .hero-cta .btn {
        display: block;
        width: 100%;
        margin-bottom: var(--space-3);
    }
    
    .hero-cta .btn:last-child {
        margin-bottom: 0;
    }
}

/* Scroll animations trigger */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* Loading state */
.loading {
    opacity: 0;
    pointer-events: none;
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus states for accessibility */
.btn:focus,
.nav-link:focus,
.social-link:focus {
    outline: 2px solid hsl(var(--primary));
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --text-primary: 0 0% 0%;
        --text-secondary: 0 0% 20%;
        --border: 0 0% 50%;
    }
}