/* =========================
OBSIDIAN AI — ELITE UI SYSTEM
========================= */

:root {
    --black: #000;
    --white: #fff;
    --dim: #8a8a8a;
    --border: #1a1a1a;
    --accent: #00ff9d;
    --glass: rgba(255,255,255,0.05);
}

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

body{
    font-family: 'Syne', sans-serif;
    background:#000;
    color:#fff;
    line-height:1.6;
}

/* CONTAINER */
.container{
    max-width:1200px;
    margin:auto;
    padding:0 24px;
}

/* NAV */
header{
    position:fixed;
    width:100%;
    top:0;
    background:rgba(0,0,0,0.85);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--border);
    z-index:1000;
}

nav{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:16px 0;
}

.nav-links{
    display:flex;
    gap:28px;
    list-style:none;
}

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

.nav-links a:hover{color:#fff;}

/* HERO (NEURALINK STYLE) */
.hero{
    min-height:100vh;
    display:flex;
    align-items:center;
}

.hero h1{
    font-size:clamp(3rem,8vw,6rem);
    line-height:1;
    margin-bottom:20px;
}

.hero p{
    max-width:500px;
    color:var(--dim);
}

/* BUTTON */
.btn{
    padding:14px 28px;
    display:inline-block;
    text-decoration:none;
    margin-top:20px;
    border-radius:4px;
}

.btn-primary{
    background:var(--accent);
    color:#000;
    box-shadow:0 0 20px rgba(0,255,157,0.3);
}

.btn-primary:hover{
    transform:translateY(-2px);
    box-shadow:0 0 40px rgba(0,255,157,0.6);
}

/* SECTIONS */
.section{
    padding:120px 0;
    border-top:1px solid var(--border);
}

/* GRID */
.grid{
    display:grid;
    gap:24px;
}

.grid-3{
    grid-template-columns:repeat(3,1fr);
}

@media(max-width:768px){
    .grid-3{grid-template-columns:1fr;}
}

/* CARDS */
.card{
    background:var(--glass);
    border:1px solid var(--border);
    padding:24px;
    border-radius:8px;
    transition:0.3s;
}

.card:hover{
    border-color:var(--accent);
    transform:translateY(-6px);
}

/* VIDEO SECTION (Neuralink feel) */
.video-section{
    position:relative;
    height:70vh;
    overflow:hidden;
}

.video-section video{
    width:100%;
    height:100%;
    object-fit:cover;
    opacity:0.4;
}

.video-overlay{
    position:absolute;
    top:50%;
    left:50%;
    transform:translate(-50%,-50%);
    text-align:center;
}

/* FOOTER */
footer{
    text-align:center;
    padding:40px;
    color:var(--dim);
    border-top:1px solid var(--border);
}