:root {
    --bg: #020b14;
    --cyan: #00f0ff;
    --teal: #00ffa3;
    --text: #e2e8f0;
    --font-head: 'Cinzel', serif;
    --font-body: 'Space Grotesk', sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: var(--bg); color: var(--text); font-family: var(--font-body); overflow: hidden; height: 100vh; }

canvas#abyssCanvas { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: 1; opacity: 0.6; }

.nav { position: fixed; top: 0; width: 100%; padding: 2.5rem 4rem; display: flex; justify-content: space-between; align-items: center; z-index: 10; }
.logo { font-family: var(--font-head); font-size: 1.4rem; color: var(--cyan); letter-spacing: 2px; }
.depth-hud { font-size: 0.85rem; color: var(--teal); letter-spacing: 2px; border: 1px solid rgba(0,255,163,0.3); padding: 6px 14px; border-radius: 100px; }

.hero { position: relative; z-index: 5; height: 100vh; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; padding: 0 2rem; }
.badge { background: rgba(0, 240, 255, 0.1); border: 1px solid var(--cyan); color: var(--cyan); padding: 6px 16px; border-radius: 100px; font-size: 0.8rem; letter-spacing: 3px; margin-bottom: 1.5rem; }
h1 { font-family: var(--font-head); font-size: 3.8rem; line-height: 1.15; margin-bottom: 1.5rem; background: linear-gradient(135deg, #ffffff, var(--teal)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; max-width: 850px; }
p { font-size: 1.2rem; color: #94a3b8; max-width: 650px; margin-bottom: 2.5rem; font-weight: 300; }

.btn-sonar { background: transparent; border: 1px solid var(--teal); color: var(--teal); padding: 1rem 2.5rem; font-family: var(--font-body); font-weight: 700; letter-spacing: 2px; cursor: pointer; transition: 0.3s; border-radius: 4px; box-shadow: 0 0 15px rgba(0,255,163,0.2); }
.btn-sonar:hover { background: var(--teal); color: var(--bg); box-shadow: 0 0 35px rgba(0,255,163,0.8); }