:root {
    --bg-color: #0A0A0A;
    --surface-color: #141414;
    --surface-border: #262626;
    --text-primary: #EDEDED;
    --text-secondary: #A1A1AA;
    --accent-color: #3B82F6;
    --accent-hover: #2563EB;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

html {
    scroll-behavior: smooth;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    position: sticky;
    top: 0;
    background-color: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--surface-border);
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.brand h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: #D4D4D8;
}

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

.btn-secondary:hover {
    background-color: #1F1F1F;
}

.btn-outline {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--surface-border);
}

.btn-outline:hover {
    background-color: var(--surface-color);
}

.btn-large {
    padding: 14px 28px;
    font-size: 1.05rem;
}

/* Hero */
.hero {
    padding: 120px 0 80px;
    text-align: center;
}

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

.hero h2 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero p {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.compatibility-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Features */
.features {
    padding: 80px 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background-color: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: 12px;
    padding: 32px;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--surface-border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 24px;
}

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

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

/* Download */
.download-section {
    padding: 80px 0;
}

.download-box {
    background-color: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: 16px;
    padding: 64px 24px;
    text-align: center;
}

.download-box h2 {
    font-size: 2rem;
    margin-bottom: 8px;
}

#version-display {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 0.9rem;
}

.download-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.download-note {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Security */
.security-section {
    padding: 60px 0 100px;
}

.security-badge {
    max-width: 600px;
    margin: 0 auto;
    border-left: 2px solid var(--surface-border);
    padding-left: 24px;
}

.security-badge h3 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.security-list {
    list-style: none;
}

.security-list li {
    font-size: 0.95rem;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.security-list li strong {
    color: var(--text-primary);
}

/* Footer */
footer {
    border-top: 1px solid var(--surface-border);
    padding: 40px 0;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
}

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

.copyright {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    nav {
        display: none; /* Hide nav links on mobile for simplicity, keep download CTA if moved */
    }
    
    .hero {
        padding: 80px 0 60px;
    }
    
    .download-actions {
        flex-direction: column;
    }
    
    .footer-container {
        flex-direction: column;
        align-items: flex-start;
    }
}