/* =========================================================
   NebulaEdge — Vercel-style monochrome design system
   Palette: #000 / #0a0a0a / #fff / #fafafa / grays
   Signature: dot-matrix background, triangle logo, sharp geometry
   ========================================================= */
:root{
  --bg:#ffffff;
  --bg-alt:#fafafa;
  --ink:#000000;
  --ink-2:#0a0a0a;
  --gray-900:#111111;
  --gray-700:#3a3a3a;
  --gray-600:#666666;
  --gray-500:#888888;
  --gray-300:#eaeaea;
  --line:rgba(0,0,0,.08);
  --line-strong:rgba(0,0,0,.14);
  --dot:rgba(0,0,0,.07);
  --radius:4px;
  --maxw:1080px;
  --font:"Inter","-apple-system",BlinkMacSystemFont,"Segoe UI","Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--ink);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.8);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:1.05rem;letter-spacing:-.01em;color:var(--ink)}
.brand-dot{
  width:14px;height:14px;background:var(--ink);
  clip-path:polygon(50% 0,100% 100%,0 100%);
  -webkit-clip-path:polygon(50% 0,100% 100%,0 100%);
}
.nav-links{display:flex;gap:30px;font-size:.875rem;color:var(--gray-600)}
.nav-links a{transition:color .15s}
.nav-links a:hover{color:var(--ink)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:4px}
.nav-toggle span{width:22px;height:2px;background:var(--ink);border-radius:0;transition:transform .25s,opacity .25s}

/* ---------- eyebrow ---------- */
.eyebrow{
  font-size:.72rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;
  color:var(--gray-600);margin-bottom:14px;
}
.eyebrow-on-dark{color:var(--gray-300)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:96px 0 64px;border-bottom:1px solid var(--line)}
/* signature dot-matrix, masked to fade toward bottom */
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(circle,var(--dot) 1px,transparent 1.5px);
  background-size:24px 24px;background-position:0 0;
  -webkit-mask-image:linear-gradient(180deg,#000 0,#000 55%,transparent 100%);
  mask-image:linear-gradient(180deg,#000 0,#000 55%,transparent 100%);
}
.hero-inner{position:relative}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-size:.72rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;
  color:var(--gray-700);
  border:1px solid var(--line-strong);border-radius:999px;
  padding:6px 14px;margin-bottom:28px;background:#fff;
}
.eyebrow-mark{
  width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;
  border-bottom:7px solid var(--ink);
}
.hero-title{
  font-size:clamp(2.2rem,5.2vw,4rem);font-weight:800;line-height:1.08;
  letter-spacing:-.02em;margin-bottom:22px;
}
/* monochrome highlight bar — the one memorable accent */
.mark{
  background:var(--ink);color:#fff;padding:0 .14em;
  -webkit-box-decoration-break:clone;box-decoration-break:clone;
}
.hero-sub{max-width:560px;margin-bottom:36px;color:var(--gray-600);font-size:1.05rem;line-height:1.65}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:48px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 26px;border-radius:var(--radius);
  font-weight:600;font-size:.95rem;letter-spacing:-.01em;line-height:1;
  border:1px solid transparent;transition:background .15s,color .15s,border-color .15s;
}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:#1a1a1a}
.btn-ghost{border-color:var(--line-strong);color:var(--ink);background:transparent}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-on-dark{background:#fff;color:var(--ink)}
.btn-on-dark:hover{background:#eaeaea}
.hero-meta{
  display:flex;gap:40px;flex-wrap:wrap;list-style:none;
  color:var(--gray-600);font-size:.88rem;
  padding-top:32px;border-top:1px solid var(--line);
}
.hero-meta b{display:block;font-size:1.5rem;color:var(--ink);font-weight:800;letter-spacing:-.02em;margin-bottom:2px}
.hero-visual{margin-top:56px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--bg-alt)}
.hero-visual-img{width:100%;height:auto;display:block}

/* ---------- sections ---------- */
section{padding:88px 0}
.section-title{font-size:clamp(1.8rem,3.4vw,2.6rem);font-weight:800;line-height:1.15;letter-spacing:-.02em;margin-bottom:14px}
.section-sub{color:var(--gray-600);margin-bottom:48px;font-size:1rem;max-width:520px}
.grad{color:var(--ink);font-weight:800}

/* ---------- cards ---------- */
.features{border-bottom:1px solid var(--line)}
.grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;
}
.card{background:var(--bg);padding:32px 28px;transition:background .2s}
.card:hover{background:var(--bg-alt)}
.card-icon{
  width:40px;height:40px;display:flex;align-items:center;justify-content:center;
  margin-bottom:20px;border:1px solid var(--line-strong);border-radius:var(--radius);
  color:var(--ink);
}
.card-icon svg{width:22px;height:22px}
.card h3{font-size:1.1rem;font-weight:700;margin-bottom:10px;letter-spacing:-.01em}
.card p{color:var(--gray-600);font-size:.92rem;line-height:1.6}

/* ---------- visual ---------- */
.visual{background:var(--bg-alt);border-bottom:1px solid var(--line)}
.visual-img{display:block;width:100%;border:1px solid var(--line);border-radius:var(--radius)}

/* ---------- stats ---------- */
.stats{background:var(--bg);border-bottom:1px solid var(--line)}
.stats-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;
}
.stat{background:var(--bg);padding:34px 24px;text-align:left}
.stat b{display:block;font-size:2.6rem;font-weight:800;letter-spacing:-.03em;line-height:1;color:var(--ink);margin-bottom:8px}
.stat span{color:var(--gray-600);font-size:.88rem}

/* ---------- cta ---------- */
.cta{background:var(--ink);color:#fff}
.cta-inner{max-width:760px}
.cta .eyebrow{color:var(--gray-300)}
.cta h2{font-size:clamp(1.8rem,3.4vw,2.6rem);font-weight:800;letter-spacing:-.02em;line-height:1.15;margin-bottom:16px}
.cta p{color:var(--gray-300);margin-bottom:32px;font-size:1.02rem}

/* ---------- footer ---------- */
.footer{background:var(--bg);padding:72px 0 0}
.footer-inner{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;
  padding-bottom:48px;border-bottom:1px solid var(--line);
}
.footer-brand p{color:var(--gray-600);font-size:.9rem;margin-top:14px;max-width:260px}
.footer-col h4{font-size:.72rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--gray-600);margin-bottom:16px}
.footer-col a{display:block;color:var(--gray-700);font-size:.92rem;padding:5px 0;transition:color .15s}
.footer-col a:hover{color:var(--ink)}
.footer-bottom{padding:24px 0}
.footer-bottom p{color:var(--gray-600);font-size:.82rem}

/* ---------- reveal (scroll animation, driven by main.js) ---------- */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
}

/* ---------- responsive ---------- */
@media(max-width:820px){
  .nav-links{
    position:fixed;top:64px;left:0;right:0;flex-direction:column;
    background:#fff;padding:20px 24px;gap:14px;
    border-bottom:1px solid var(--line);
    box-shadow:0 12px 28px rgba(0,0,0,.05);
    transform:translateY(-8px);opacity:0;visibility:hidden;
    transition:opacity .25s ease,transform .25s ease,visibility .25s ease;
  }
  .nav-links.open{transform:none;opacity:1;visibility:visible}
  .nav-toggle{display:flex}
  .hero{padding:64px 0 48px}
  .hero-meta{gap:24px}
  .footer-inner{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
  .hero-meta{gap:22px}
  .hero-meta b{font-size:1.3rem}
  .footer-inner{grid-template-columns:1fr}
}