/* CSS Variables */
:root {
    --brand-50: #e6f2ff;
    --brand-100: #b3d9ff;
    --brand-500: #0073e6;
    --brand-600: #005bb5;
    --brand-700: #004494;

    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-400: #9ca3af;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --white: #ffffff;
    --background: #ffffff;
    --foreground: #171717;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --transition: all 0.2s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    color: var(--foreground);
    background-color: var(--background);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 9999px;
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-align: center;
}

.btn-sm {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
}

.btn-primary {
    background-color: var(--brand-500);
    color: var(--white);
    border-color: var(--brand-500);
}

.btn-primary:hover {
    background-color: var(--brand-600);
    border-color: var(--brand-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    color: var(--brand-500);
    border-color: var(--brand-500);
}

.btn-outline:hover {
    background-color: var(--brand-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-white {
    background-color: var(--white);
    color: var(--brand-500);
    border-color: var(--white);
}

.btn-white:hover {
    background-color: var(--gray-100);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-outline-white:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
}

.navbar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.logo img {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--gray-700);
    border-radius: 3px;
    transition: var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.mobile-menu {
    display: none;
    padding: 1rem;
    background-color: var(--white);
    border-top: 1px solid var(--gray-200);
}

.mobile-menu.active {
    display: block;
}

/* Hero Section */
.hero {
    padding-top: 100px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.hero-text {
    flex: 1;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero-text h1 span {
    display: block;
}

.hero-text h1 .highlight {
    color: var(--brand-500);
}

.hero-text p {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 2rem;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image img {
    max-height: 80vh;
    width: auto;
}

/* Section Styles */
.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    text-align: center;
    margin-bottom: 3rem;
}

/* Features Section */
.features {
    padding: 5rem 0;
    background-color: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.feature-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    background-color: var(--brand-50);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: var(--brand-500);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* How It Works Section */
.how-it-works {
    padding: 5rem 0;
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.step {
    text-align: center;
    max-width: 250px;
}

.step-number {
    width: 60px;
    height: 60px;
    background-color: var(--brand-500);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.step p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

.step-connector {
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--brand-500), var(--brand-100));
    border-radius: 3px;
}

/* CTA Section */
.cta {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--brand-500) 0%, var(--brand-700) 100%);
    color: var(--white);
}

.cta-content {
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.cta p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background-color: var(--gray-50);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 3rem;
    flex-wrap: wrap;
}

.footer-brand {
    max-width: 400px;
}

.footer-brand img {
    height: 40px;
    margin-bottom: 1rem;
}

.footer-brand p {
    color: var(--gray-600);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.footer-section h4 {
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.footer-links a:hover {
    color: var(--brand-500);
}

.footer-logos p {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 1rem;
}

.sponsor-logos {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.sponsor-logos img {
    height: 40px;
    width: auto;
}

.footer-bottom {
    border-top: 1px solid var(--gray-200);
    margin-top: 2rem;
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.75rem;
    color: var(--gray-600);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .hero-content {
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding-top: 80px;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-text p {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-image {
        display: none;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .steps {
        flex-direction: column;
        gap: 2rem;
    }

    .step-connector {
        width: 3px;
        height: 40px;
        background: linear-gradient(180deg, var(--brand-500), var(--brand-100));
    }

    .cta h2 {
        font-size: 1.75rem;
    }

    .cta p {
        font-size: 1rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
    }

    .footer-brand {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 0.65rem 1.5rem;
        font-size: 0.9rem;
    }

    .hero-text h1 {
        font-size: 1.75rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .cta-buttons .btn {
        width: 100%;
        max-width: 280px;
    }
}