:root {
    --bg-base: #050505;
    --bg-surface: #121212;
    --bg-elevated: #1a1a1a;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-disabled: #555555;
    
    --accent-blue: #2563eb;
    --accent-glow: rgba(37, 99, 235, 0.4);
    
    --border-color: #2a2a2a;
    --border-highlight: #333333;
    
    --font-mono: "JetBrains Mono", "SF Mono", Consolas, Menlo, monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { background-color: var(--bg-base); color: var(--text-primary); font-family: var(--font-sans); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: 0.2s ease; }
ul { list-style: none; }

/* Grid Background */
.grid-bg { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background-image: linear-gradient(var(--border-color) 1px, transparent 1px), linear-gradient(90deg, var(--border-color) 1px, transparent 1px); background-size: 50px 50px; opacity: 0.2; z-index: -1; pointer-events: none; }
.grid-bg::after { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.15) 0%, transparent 60%); }

/* Navbar */
.nav { padding: 20px 4%; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); background: rgba(5, 5, 5, 0.8); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 100; }
.nav-brand { font-size: 20px; font-weight: 700; letter-spacing: 1px; display: flex; align-items: center; gap: 8px; }
.nav-brand::before { content: ''; display: block; width: 8px; height: 8px; background: var(--accent-blue); border-radius: 50%; box-shadow: 0 0 10px var(--accent-blue); }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 13px; font-family: var(--font-mono); color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; }
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }
.nav-btn { background: var(--bg-surface); border: 1px solid var(--border-highlight); color: var(--text-primary) !important; padding: 8px 20px; border-radius: 4px; font-family: var(--font-mono); font-size: 12px; }
.nav-btn:hover { border-color: var(--accent-blue); background: rgba(37, 99, 235, 0.1); }

/* Hero */
.hero { padding: 100px 4% 80px; text-align: center; max-width: 1000px; margin: 0 auto; }
.hero-tag { display: inline-block; padding: 4px 12px; border: 1px solid var(--border-highlight); border-radius: 20px; font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary); margin-bottom: 24px; background: var(--bg-surface); }
.hero h1 { font-size: 56px; font-weight: 700; line-height: 1.2; margin-bottom: 24px; letter-spacing: -1px; }
.hero p { font-size: 18px; color: var(--text-secondary); font-weight: 400; max-width: 700px; margin: 0 auto 40px; line-height: 1.8; }
.btn-group { display: flex; justify-content: center; gap: 16px; }
.btn { padding: 14px 32px; border-radius: 6px; font-size: 14px; font-weight: 600; cursor: pointer; transition: 0.2s; border: 1px solid transparent; }
.btn-primary { background: var(--accent-blue); color: #fff; box-shadow: 0 0 20px var(--accent-glow); }
.btn-primary:hover { background: #1d4ed8; box-shadow: 0 0 30px var(--accent-glow); }
.btn-secondary { background: var(--bg-elevated); color: var(--text-primary); border-color: var(--border-color); }
.btn-secondary:hover { border-color: var(--text-secondary); background: #222; }

/* Stats Panel */
.stats { display: flex; justify-content: center; gap: 40px; padding: 0 4%; margin-bottom: 80px; flex-wrap: wrap; }
.stat-box { background: var(--bg-surface); border: 1px solid var(--border-color); padding: 30px; border-radius: 8px; width: 220px; text-align: center; }
.stat-box h3 { font-family: var(--font-mono); font-size: 32px; color: var(--text-primary); margin-bottom: 8px; }
.stat-box p { font-size: 12px; color: var(--text-disabled); text-transform: uppercase; letter-spacing: 1px; }

/* Main Container */
.container { max-width: 1200px; margin: 0 auto; padding: 0 4%; }
.section-title { font-size: 32px; font-weight: 700; margin-bottom: 40px; border-bottom: 1px solid var(--border-color); padding-bottom: 20px; display: flex; align-items: center; gap: 16px; }
.section-title::before { content: '>'; font-family: var(--font-mono); color: var(--accent-blue); }

/* About */
.about-panel { background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: 8px; padding: 40px; margin-bottom: 80px; position: relative; overflow: hidden; }
.about-panel::before { content: ''; position: absolute; left: 0; top: 0; width: 4px; height: 100%; background: var(--accent-blue); }
.about-panel p { font-size: 16px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.about-panel p:last-child { margin-bottom: 0; }

/* Features Grid */
.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; margin-bottom: 80px; }
.feat-card { background: var(--bg-surface); border: 1px solid var(--border-color); padding: 30px; border-radius: 8px; transition: 0.3s; }
.feat-card:hover { border-color: var(--accent-blue); background: var(--bg-elevated); transform: translateY(-3px); }
.feat-id { font-family: var(--font-mono); font-size: 12px; color: var(--text-disabled); margin-bottom: 16px; display: block; }
.feat-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; color: var(--text-primary); }
.feat-card p { font-size: 14px; color: var(--text-secondary); }

/* Interface Showcase */
.interface-showcase { margin-bottom: 80px; border: 1px solid var(--border-highlight); border-radius: 8px; background: var(--bg-surface); padding: 12px; box-shadow: 0 20px 50px rgba(0,0,0,0.5); }
.interface-showcase img { width: 100%; border-radius: 4px; display: block; }

/* Guide */
.guide-list { display: flex; flex-direction: column; gap: 16px; margin-bottom: 80px; }
.guide-item { background: var(--bg-surface); border: 1px solid var(--border-color); padding: 24px 30px; border-radius: 8px; display: flex; align-items: center; gap: 30px; }
.guide-num { font-family: var(--font-mono); font-size: 24px; color: var(--accent-blue); font-weight: 700; width: 40px; }
.guide-info h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.guide-info p { font-size: 14px; color: var(--text-secondary); }

/* FAQ */
.faq-list { margin-bottom: 80px; }
.faq-item { background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: 8px; padding: 30px; margin-bottom: 16px; }
.faq-q { font-size: 16px; font-weight: 600; margin-bottom: 12px; display: flex; gap: 12px; }
.faq-q::before { content: 'SYS.ERR>'; font-family: var(--font-mono); color: #ef4444; font-size: 13px; margin-top: 2px; }
.faq-a { font-size: 14px; color: var(--text-secondary); padding-left: 85px; line-height: 1.8; }

/* Footer */
.footer { border-top: 1px solid var(--border-color); padding: 40px 4%; display: flex; justify-content: space-between; align-items: center; background: var(--bg-surface); }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-family: var(--font-mono); font-size: 12px; color: var(--text-disabled); text-transform: uppercase; }
.footer-links a:hover { color: var(--text-primary); }
.footer-copy { font-family: var(--font-mono); font-size: 12px; color: var(--text-disabled); }

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 36px; }
    .btn-group { flex-direction: column; }
    .footer { flex-direction: column; gap: 20px; text-align: center; }
    .faq-q { flex-direction: column; gap: 4px; }
    .faq-q::before { margin-top: 0; }
    .faq-a { padding-left: 0; margin-top: 8px; }
}