:root {
    --primary: #3b82f6;
    --primary-dark: #1d4ed8;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-white: #f8fafc;
    --text-muted: #94a3b8;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background: var(--bg-dark); color: var(--text-white); line-height: 1.6; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.bg-alt { background: #0b1120; }
.section-title { font-size: 2.5rem; text-align: center; margin-bottom: 40px; }

/* Navbar */
.navbar { position: fixed; top: 0; width: 100%; height: 80px; background: rgba(15, 23, 42, 0.9); backdrop-filter: blur(10px); z-index: 1000; display: flex; align-items: center; border-bottom: 1px solid rgba(255,255,255,0.1); }
.nav-container { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.nav-menu { display: flex; list-style: none; gap: 30px; }
.nav-link { color: white; text-decoration: none; font-weight: 500; }
.logo-img { height: 40px; }

/* Hero */
.hero { height: 100vh; display: flex; align-items: center; text-align: center; position: relative; background: url('../assets/blueprint-ai-hero.png') center/cover; }
.hero::before { content: ''; position: absolute; inset: 0; background: rgba(0,0,0,0.6); z-index: 1; }
.hero-content { position: relative; z-index: 2; width: 100%; }
.hero-title { font-size: 4rem; margin-bottom: 20px; }

/* Roadmap */
.roadmap { position: relative; max-width: 800px; margin: 0 auto; padding: 40px 0; }
.roadmap::before { content: ''; position: absolute; left: 31px; top: 0; width: 4px; height: 100%; background: var(--primary); box-shadow: 0 0 15px var(--primary); }
.roadmap-item { position: relative; margin-bottom: 60px; padding-left: 80px; cursor: pointer; }
.roadmap-dot { position: absolute; left: 20px; top: 0; width: 26px; height: 26px; background: var(--bg-dark); border: 4px solid var(--primary); border-radius: 50%; z-index: 2; transition: 0.3s; }
.roadmap-item:hover .roadmap-dot { background: var(--primary); transform: scale(1.4); box-shadow: 0 0 20px var(--primary); }
.roadmap-content { background: var(--bg-card); padding: 30px; border-radius: 15px; border: 1px solid rgba(255,255,255,0.1); }

/* Buttons */
.btn { padding: 12px 30px; border-radius: 5px; text-decoration: none; font-weight: 600; display: inline-block; cursor: pointer; border: none; }
.btn-primary { background: var(--primary); color: white; }

/* Footer */
footer { padding: 40px 0; text-align: center; border-top: 1px solid #334155; }