:root {
  --bg: #0f1419;
  --bg-alt: #0d1821;
  --surface: #112233;
  --accent: #00c2ff;
  --accent-dim: #0091b3;
  --text: #e8eef2;
  --text-muted: #5a7a8a;
  --text-dim: #3d5a6e;
  --warm: #ffb347;
  --border: #1e2d3a;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Navigation */
.nav { padding: 20px 0; border-bottom: 1px solid var(--border); }
.nav-inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-family: var(--font-display); font-size: 18px; font-weight: 700; }
.nav-tagline { font-size: 12px; color: var(--text-muted); letter-spacing: 0.08em; text-transform: uppercase; }

/* Hero */
.hero { padding: 80px 0 60px; }
.hero-inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-badge { display: inline-block; background: var(--surface); border: 1px solid var(--border); color: var(--accent); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; padding: 5px 12px; border-radius: 100px; margin-bottom: 24px; }
.hero h1 { font-family: var(--font-display); font-size: clamp(32px, 4vw, 48px); font-weight: 800; line-height: 1.1; color: var(--text); margin-bottom: 20px; }
.hero-lede { color: var(--text-muted); font-size: 17px; line-height: 1.65; max-width: 440px; }

/* Schematic Frame */
.schematic-frame { background: #0a1520; border: 1px solid var(--border); border-radius: 10px; padding: 20px; box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,194,255,0.08); }
.schematic-label { font-size: 10px; color: var(--text-dim); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 12px; font-family: var(--font-display); }
.schematic-svg { width: 100%; border-radius: 6px; }
.schematic-caption { font-size: 11px; color: var(--text-dim); margin-top: 10px; text-align: center; font-style: italic; }

/* How It Works */
.hiw { padding: 80px 0; border-top: 1px solid var(--border); background: var(--bg-alt); }
.hiw-inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.section-title { font-family: var(--font-display); font-size: clamp(24px, 3vw, 34px); font-weight: 700; text-align: center; margin-bottom: 56px; line-height: 1.25; }
.hiw-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; }
.hiw-step { }
.step-num { font-family: var(--font-display); font-size: 42px; font-weight: 800; color: var(--accent); opacity: 0.25; line-height: 1; margin-bottom: 16px; }
.hiw-step h3 { font-family: var(--font-display); font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.hiw-step p { color: var(--text-muted); font-size: 15px; line-height: 1.65; }

/* Differentiation */
.diff { padding: 80px 0; }
.diff-inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.diff-header { max-width: 600px; margin: 0 auto; text-align: center; margin-bottom: 56px; }
.diff-header h2 { font-family: var(--font-display); font-size: clamp(26px, 3.5vw, 40px); font-weight: 800; line-height: 1.2; margin-bottom: 16px; }
.diff-sub { color: var(--text-muted); font-size: 17px; line-height: 1.6; }
.diff-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px; background: var(--border); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.diff-card { background: var(--surface); padding: 36px; }
.diff-icon { color: var(--accent); margin-bottom: 16px; }
.diff-card h4 { font-family: var(--font-display); font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.diff-card p { color: var(--text-muted); font-size: 14px; line-height: 1.65; }

/* Components */
.components { padding: 80px 0; border-top: 1px solid var(--border); background: var(--bg-alt); }
.components-inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; text-align: center; }
.components-badge { display: inline-block; background: var(--surface); border: 1px solid var(--border); color: var(--accent); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; padding: 5px 12px; border-radius: 100px; margin-bottom: 20px; }
.components h2 { font-family: var(--font-display); font-size: clamp(28px, 3.5vw, 42px); font-weight: 800; line-height: 1.2; margin-bottom: 16px; }
.components-desc { color: var(--text-muted); font-size: 17px; max-width: 520px; margin: 0 auto 48px; }
.symbol-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; text-align: left; }
.symbol-category { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 20px; }
.category-label { font-family: var(--font-display); font-size: 13px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 8px; }
.category-items { color: var(--text-muted); font-size: 13px; line-height: 1.7; }

/* Closing */
.closing { padding: 100px 0; }
.closing-inner { max-width: 800px; margin: 0 auto; padding: 0 24px; text-align: center; }
.closing h2 { font-family: var(--font-display); font-size: clamp(28px, 4vw, 46px); font-weight: 800; line-height: 1.15; margin-bottom: 20px; }
.closing-sub { color: var(--text-muted); font-size: 17px; line-height: 1.65; margin-bottom: 40px; max-width: 560px; margin-left: auto; margin-right: auto; }
.closing-statement { background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 6px; padding: 24px 28px; text-align: left; }
.closing-statement p { font-family: var(--font-display); font-size: 16px; font-weight: 600; color: var(--text); }

/* Footer */
.footer { padding: 32px 0; border-top: 1px solid var(--border); }
.footer-inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; display: flex; justify-content: space-between; align-items: center; }
.footer-brand { display: flex; flex-direction: column; gap: 6px; }
.footer-logo { display: flex; align-items: center; gap: 8px; font-family: var(--font-display); font-size: 15px; font-weight: 700; color: var(--text); }
.footer-brand p { color: var(--text-muted); font-size: 13px; }
.footer-bottom { color: var(--text-dim); font-size: 12px; }

/* Responsive */
@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-text { order: 1; }
  .hero-graphic { order: 2; }
  .hiw-steps { grid-template-columns: 1fr; gap: 32px; }
  .diff-grid { grid-template-columns: 1fr; }
  .symbol-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
  .hero { padding: 48px 0 40px; }
}

.nav-cta {
  background: var(--accent);
  color: #0d1821;
  font-weight: 600;
  font-size: 13px;
  padding: 7px 18px;
  border-radius: 7px;
  text-decoration: none;
  transition: background 0.15s;
  letter-spacing: 0.02em;
}
.nav-cta:hover { background: #33ccff; }