:root {
    --bg:#050505;
    --panel:#0f0f0f;
    --text:#f4f4f5;
    --muted:#a1a1aa;
    --accent:#ff2e55;
    --accent-soft:rgba(255,46,85,0.25);
    --border:rgba(255,255,255,0.08);
}

* {
    box-sizing:border-box;
    margin:0;
    padding:0;
    font-family:system-ui,-apple-system;
}

body {
    background:var(--bg);
    color:var(--text);
}

/* HEADER */
.header {
    position:sticky;
    top:0;
    z-index:20;
    background:rgba(8,8,8,0.85);
    backdrop-filter:blur(14px);
    border-bottom:1px solid var(--border);
}

.header-inner {
    max-width:1200px;
    margin:auto;
    padding:12px 32px;
    display:flex;
    align-items:center;
    justify-content:space-between;
}

.logo {
    font-weight:600;
}

nav a {
    margin:0 18px;
    text-decoration:none;
    color:var(--muted);
}

nav a:hover {
    color:white;
}

/* BUTTONS */
.btn {
    padding:14px 32px;
    border-radius:999px;
    border:none;
    font-size:0.95rem;
    cursor:pointer;
}

.primary {
    background:var(--accent);
    color:white;
    box-shadow:0 0 32px rgba(255,46,85,0.4);
}

.ghost {
    background:transparent;
    color:white;
    border:1px solid var(--border);
}

/* SECTIONS */
section {
    padding:120px 5vw;
}

.hero {
    padding-top:160px;
}

/* HERO */
.hero-inner {
    max-width:1200px;
    margin:auto;
    display:grid;
    grid-template-columns:1.1fr 1fr;
    gap:72px;
    align-items:center;
}

.eyebrow {
    font-size:0.7rem;
    letter-spacing:0.25em;
    color:var(--accent);
    margin-bottom:20px;
}

.hero h1 {
    font-size:4.4rem;
    margin-bottom:24px;
}

.hero p {
    color:var(--muted);
    margin-bottom:32px;
    max-width:520px;
}

/* 3D MODEL */
.model-frame {
    position:relative;
    height:520px;
    border-radius:32px;
    background:radial-gradient(600px at center,var(--accent-soft),transparent);
    overflow:hidden;
}

.model-frame canvas {
    width:100%;
    height:100%;
}

.model-label {
    position:absolute;
    bottom:20px;
    left:24px;
    font-size:0.7rem;
    color:var(--muted);
    letter-spacing:0.12em;
    text-transform:uppercase;
}

/* SYSTEM */
.system-inner {
    max-width:1100px;
    margin:auto;
    text-align:center;
}

.lead {
    color:var(--muted);
    margin:24px auto 64px;
    max-width:640px;
}

.system-grid {
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    gap:32px;
}

.system-card {
    background:var(--panel);
    border:1px solid var(--border);
    border-radius:20px;
    padding:32px;
}

/* CORE */
.core-inner {
    max-width:1200px;
    margin:auto;
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:72px;
    align-items:center;
}

.core-visual {
    height:460px;
}

.core-visual canvas {
    width:100%;
    height:100%;
}

.core-copy ul {
    margin-top:24px;
    padding-left:20px;
}

.core-copy li {
    margin-bottom:12px;
    color:var(--muted);
}

/* USE CASES */
.use-cases {
    text-align:center;
}

.use-grid {
    max-width:1000px;
    margin:64px auto 0;
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    gap:32px;
}

.use-card {
    background:var(--panel);
    border:1px solid var(--border);
    border-left:3px solid var(--accent);
    border-radius:20px;
    padding:32px;
}

/* PRINCIPLES */
.principles-inner {
    max-width:1100px;
    margin:auto;
}

.principles-grid {
    margin-top:64px;
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    gap:32px;
}

/* CTA */
.cta {
    text-align:center;
    background:radial-gradient(700px at center,rgba(255,46,85,0.35),transparent);
}

.cta p {
    margin:20px 0 32px;
    color:var(--muted);
}

/* FOOTER */
footer {
    padding:32px;
    text-align:center;
    color:var(--muted);
}

/* MOBILE */
@media(max-width:900px){
    .hero-inner,
    .core-inner {
        grid-template-columns:1fr;
    }

    nav {
        display:none;
    }

    .hero h1 {
        font-size:3.2rem;
    }
}