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

:root {
    --color-primary: #22c55e;
    --color-primary-dark: #16a34a;
    --color-primary-light: #4ade80;
    --color-bg: #09090b;
    --color-bg-secondary: #111113;
    --color-bg-tertiary: #1a1a1d;
    --color-text: #ffffff;
    --color-text-secondary: #a3a3a3;
    --color-text-muted: #737373;
    --color-border: #2a2a2a;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --container-max: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --transition: 0.2s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

code {
    background: var(--color-bg-tertiary);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(9, 9, 11, 0.8);
    backdrop-filter: blur(12px);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

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

.logo-icon {
    width: 32px;
    height: 32px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    text-decoration: none;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: var(--color-primary);
    color: #000;
}

.btn-primary:hover {
    background: var(--color-primary-light);
    color: #000;
}

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

.btn-secondary:hover {
    color: var(--color-text);
    border-color: var(--color-text-muted);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-chevron {
    width: 16px;
    height: 16px;
    margin-left: 0.25rem;
    transition: transform var(--transition);
}

/* Download Dropdown */
.download-wrapper {
    position: relative;
    display: inline-block;
}

.version-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 50%;
    transform: translateX(-50%);
    min-width: 260px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
    z-index: 50;
    overflow: hidden;
}

.version-dropdown.active {
    opacity: 1;
    visibility: visible;
}

.dropdown-header {
    padding: 0.75rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border);
}

.dropdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    color: var(--color-text);
    text-decoration: none;
    transition: background var(--transition);
}

.dropdown-item:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}

.version-range {
    font-weight: 500;
}

.version-info {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* Hero Section */
.hero {
    padding: calc(4rem + var(--spacing-2xl)) 0 var(--spacing-2xl);
    text-align: center;
    background: radial-gradient(ellipse at top, rgba(34, 197, 94, 0.05) 0%, transparent 50%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: rgba(34, 197, 94, 0.1);
    border-radius: 2rem;
    color: var(--color-primary);
    font-size: 0.8125rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.01em;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

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

/* Stats Section */
.stats {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.stat-label {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* Section Titles */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

/* Features Section */
.features {
    padding: var(--spacing-2xl) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: rgba(34, 197, 94, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.feature-icon svg {
    width: 20px;
    height: 20px;
    stroke: var(--color-primary);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

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

/* Installation Section */
.installation {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
}

.steps {
    max-width: 700px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 19px;
    top: 44px;
    bottom: -16px;
    width: 1px;
    background: var(--color-border);
}

.step-number {
    width: 38px;
    height: 38px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    color: #000;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.step-content p {
    color: var(--color-text-secondary);
}

/* FAQ Section */
.faq {
    padding: var(--spacing-2xl) 0;
}

.faq-grid {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.faq-item {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

.faq-item summary {
    padding: var(--spacing-md);
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.25rem;
    color: var(--color-text-muted);
    transition: transform var(--transition);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--color-text-secondary);
}

/* CTA Section */
.cta {
    padding: var(--spacing-2xl) 0;
}

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

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.cta p {
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
}

/* Footer */
.footer {
    padding: var(--spacing-xl) 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

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

.footer-info p {
    margin-bottom: 0.25rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

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

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

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

    .hero-description {
        font-size: 1rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .stat-number {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

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

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

/* Selection */
::selection {
    background: rgba(34, 197, 94, 0.3);
    color: var(--color-text);
}

/* Focus states for accessibility */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Smooth animations */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html {
        scroll-behavior: auto;
    }
}