:root {
    --primary-color: #6366f1;
    --secondary-color: #ec4899;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-brand i {
    font-size: 28px;
    color: var(--accent-color);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* Buttons */
.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
}

.btn-primary:hover {
    background: #5855eb;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.btn-hero:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.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="0.05"><circle cx="30" cy="30" r="2"/></g></g></svg>');
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateX(0px) translateY(0px); }
    50% { transform: translateX(20px) translateY(-10px); }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(45deg, #fbbf24, #f59e0b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
    text-align: center;
}

.hero-visual {
    position: relative;
    height: 500px;
}

.floating-cards {
    position: relative;
    width: 100%;
    height: 100%;
}

.floating-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 20px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 10px;
    animation: floatCard 6s ease-in-out infinite;
    animation-delay: var(--delay);
}

.floating-card:nth-child(1) {
    top: 20%;
    right: 10%;
}

.floating-card:nth-child(2) {
    top: 50%;
    left: 20%;
}

.floating-card:nth-child(3) {
    bottom: 20%;
    right: 30%;
}

@keyframes floatCard {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Categories Section */
.categories {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.category-card {
    background: white;
    padding: 40px 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.category-card::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: var(--transition);
}

.category-card:hover::before {
    left: 100%;
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.category-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    color: white;
    font-size: 36px;
}

.category-card h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.category-card p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    line-height: 1.6;
}

.category-count {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Causes List */
.causes-list {
    padding: 80px 0;
}

.causes-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 50px;
}

.causes-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.filters {
    display: flex;
    gap: 10px;
}

.filter-btn {
    padding: 8px 16px;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary-color);
    color: white;
}

.causes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.cause-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.cause-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.cause-header {
    padding: 25px;
    border-bottom: 1px solid #f3f4f6;
}

.cause-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.cause-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.cause-stats {
    display: flex;
    justify-content: space-between;
    padding: 20px 25px;
    background: var(--bg-secondary);
}

.cause-stat {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.cause-stat i {
    color: var(--primary-color);
}

.donate-section {
    padding: 20px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-donate-small {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-donate-small:hover {
    background: #5855eb;
    transform: scale(1.05);
}

/* Testimonials */
.testimonials {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.testimonials-carousel {
    max-width: 800px;
    margin: 0 auto;
}

.testimonial-card {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.testimonial-card.active {
    opacity: 1;
    transform: translateY(0);
}

.testimonial-content p {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 30px;
    line-height: 1.7;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
}

.author-info h4 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.author-info span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand p {
    margin-top: 15px;
    opacity: 0.8;
    line-height: 1.6;
}

.footer-links h4 {
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-links a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-bottom: 10px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
    padding-left: 10px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 0;
    border-radius: var(--border-radius);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.close {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    z-index: 1001;
    color: var(--text-secondary);
    transition: var(--transition);
}

.close:hover {
    color: var(--text-primary);
}

.modal-header {
    padding: 30px;
    text-align: center;
    border-bottom: 1px solid #f3f4f6;
}

.modal-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.modal-header p {
    color: var(--text-secondary);
}

.donation-form {
    padding: 30px;
}

.amount-selector h3 {
    margin-bottom: 20px;
    color: var(--text-primary);
    font-weight: 600;
}

.amount-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.amount-btn {
    padding: 15px;
    border: 2px solid #e5e7eb;
    background: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-align: center;
    transition: var(--transition);
    font-weight: 500;
}

.amount-btn:hover,
.amount-btn.selected {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
    color: var(--primary-color);
}

.donor-info {
    margin: 30px 0;
}

.donor-info input,
.donor-info textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #e5e7eb;
    border-radius: var(--border-radius);
    font-family: inherit;
    transition: var(--transition);
}

.donor-info input:focus,
.donor-info textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.donor-info textarea {
    height: 80px;
    resize: vertical;
}

#custom-amount {
    margin-bottom: 0;
}

.btn-donate {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 16px;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

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

/* Cause Profile Modal */
.cause-profile {
    max-width: 800px;
}

.profile-header {
    padding: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.profile-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 20px;
}

.profile-content {
    padding: 40px;
}

.comments-section {
    margin-top: 30px;
}

.comments-section h3 {
    margin-bottom: 20px;
    color: var(--text-primary);
    font-weight: 600;
}

.comment {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 15px;
    border-left: 4px solid var(--primary-color);
}

.comment-author {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.comment-text {
    color: var(--text-secondary);
    line-height: 1.6;
}

.comment-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 10px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .causes-header {
        flex-direction: column;
        gap: 20px;
        align-items: flex-start;
    }
    
    .filters {
        align-self: stretch;
        overflow-x: auto;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .amount-options {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .causes-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
    
    .amount-options {
        grid-template-columns: 1fr;
    }
}

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

/* Loading animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Utility classes */
.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

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