:root {
    /* Brand Colors */
    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --secondary: #6B7280;
    --accent: #3B82F6;

    /* Dark Theme Colors */
    --bg-body: #0f172a; /* Slate 900 */
    --bg-card: #1e293b; /* Slate 800 */
    --bg-card-hover: #334155; /* Slate 700 */

    /* Text Colors */
    --text-main: #f8fafc; /* Slate 50 */
    --text-muted: #94a3b8; /* Slate 400 */
    --text-inverse: #ffffff;

    /* Borders */
    --border-color: #334155;

    /* Spacing */
    --container-width: 1200px;
    --header-height: 80px;
}

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

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

/* Typography */
h1, h2, h3, h4 {
    font-weight: 800;
    line-height: 1.2;
    color: var(--text-main);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

ul {
    list-style: none;
}

/* Utilities */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

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

.section {
    padding: 80px 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    line-height: 1;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-main);
}

.btn-secondary:hover {
    color: var(--primary);
}

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

.btn-outline:hover {
    border-color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.05);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-block {
    display: flex;
    width: 100%;
}

/* Navbar */
.navbar {
    height: var(--header-height);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: rgba(15, 23, 42, 0.8); /* Semi-transparent background */
    backdrop-filter: blur(12px);
    z-index: 1000;
}

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

.logo a {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-main);
}

.logo span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-muted);
}

.nav-links a:hover {
    color: var(--text-main);
}

.nav-actions {
    display: flex;
    gap: 16px;
    align-items: center;
}

/* Hero Section */
.hero {
    padding: 100px 0 80px;
    background: radial-gradient(circle at top center, rgba(37, 99, 235, 0.15) 0%, rgba(15, 23, 42, 0) 60%);
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 60px;
}

.visual-placeholder {
    width: 100%;
    max-width: 900px;
    height: 500px;
    margin: 0 auto;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
    color: var(--text-muted);
    font-weight: 500;
}

/* Features Section */
.section-header {
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-muted);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.feature-card {
    background-color: var(--bg-card);
    padding: 32px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.feature-card .icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-muted);
}

/* Pricing Section */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    max-width: 900px;
    margin: 0 auto 40px;
}

.pricing-card {
    background-color: var(--bg-card);
    padding: 40px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card.popular {
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary);
    background-color: rgba(37, 99, 235, 0.05);
}

.badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.price {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 8px;
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.price span {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 500;
}

.price-sub {
    font-size: 0.875rem;
    color: var(--primary);
    margin-bottom: 24px;
    font-weight: 600;
}

.features-list {
    margin-bottom: 32px;
    flex-grow: 1;
}

.features-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    color: var(--text-muted);
}

.features-list .check {
    color: var(--primary);
    font-weight: bold;
}

.pricing-note {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 60px 0;
    background-color: var(--bg-body);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-brand .logo {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.footer-brand .tagline {
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--text-muted);
}

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

.footer-copyright {
    color: var(--text-muted);
    width: 100%;
    text-align: center;
    margin-top: 40px;
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .navbar-content {
        flex-direction: column;
        gap: 20px;
    }

    .nav-links {
        gap: 20px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}