:root {
    /* Color Palette */
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --secondary: #0f172a;
    --accent: #3b82f6;
    --background: #f8fafc;
    --surface: #ffffff;
    --text: #334155;
    --text-light: #64748b;
    --border: #e2e8f0;

    /* Spacing */
    --container-padding: 2rem;
    --section-spacing: 4rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #0f172a;
        --surface: #1e293b;
        --text: #e2e8f0;
        --text-light: #94a3b8;
        --border: #334155;
    }
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text);
    line-height: 1.2;
    margin-bottom: 1rem;
    font-weight: 700;
}

h1 { font-size: 2.5rem; letter-spacing: -0.05em; }
h2 { font-size: 2rem; letter-spacing: -0.03em; margin-top: 2rem; }
h3 { font-size: 1.5rem; }

p { margin-bottom: 1.5rem; }

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

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

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

/* Header */
header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
    header {
        background-color: rgba(15, 23, 42, 0.8);
    }
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text);
    letter-spacing: -0.05em;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-light);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    text-align: center;
    background: radial-gradient(circle at top right, var(--primary) -20%, transparent 40%);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary);
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

/* Main Content */
main {
    padding: var(--section-spacing) 0;
}

.content-section {
    background-color: var(--surface);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* Footer */
footer {
    background-color: var(--surface);
    border-top: 1px solid var(--border);
    padding: 4rem 0 2rem;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 0.5rem;
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Mobile Menu */
.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--text);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--surface);
        padding: 2rem;
        flex-direction: column;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-toggle {
        display: block;
    }

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