:root {
  --bg: #0A1628;
  --bg-alt: #0F2035;
  --surface: #132240;
  --fg: #F5ECD7;
  --fg-muted: rgba(245,236,215,0.5);
  --accent: #E8A838;
  --accent-dim: rgba(232,168,56,0.12);
  --grade-a: #34D399;
  --grade-b: #60A5FA;
  --grade-c: #FBBF24;
  --grade-d: #94A3B8;
  --mono: 'DM Mono', monospace;
  --serif: 'Instrument Serif', serif;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--serif);
  -webkit-font-smoothing: antialiased;
}

/* NAV */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 48px;
  border-bottom: 1px solid rgba(245,236,215,0.06);
}
.nav-logo {
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.05em;
}
.accent { color: var(--accent); }
.nav-tagline {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* HERO */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  padding: 100px 48px 80px;
  align-items: start;
}
.hero-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 28px;
}
.hero-headline {
  font-size: clamp(52px, 6vw, 80px);
  font-weight: 400;
  line-height: 1.0;
  margin-bottom: 28px;
}
.hero-headline em {
  font-style: italic;
  color: var(--accent);
}
.hero-sub {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.65;
  color: var(--fg-muted);
  max-width: 440px;
}

/* TERMINAL */
.hero-terminal {
  background: var(--surface);
  border: 1px solid rgba(245,236,215,0.08);
  border-radius: 8px;
  overflow: hidden;
}
.terminal-bar {
  background: var(--bg-alt);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid rgba(245,236,215,0.06);
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.red { background: #FF5F57; }
.dot.amber { background: #FEBC2E; }
.dot.green { background: #28C840; }
.terminal-title {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--fg-muted);
  letter-spacing: 0.1em;
  margin-left: 8px;
}
.terminal-body { padding: 20px; }
.terminal-row { margin-bottom: 8px; }
.t-label { font-family: var(--mono); font-size: 10px; color: var(--fg-muted); letter-spacing: 0.08em; display: block; margin-bottom: 4px; }
.t-val { font-family: var(--mono); font-size: 11px; color: var(--fg); }
.t-status { font-family: var(--mono); font-size: 10px; padding: 2px 6px; border-radius: 3px; margin-left: 8px; }
.t-status.active { background: rgba(52,211,153,0.15); color: var(--grade-a); }
.grade-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 12px 0; }
.grade { padding: 12px; border-radius: 4px; border: 1px solid rgba(255,255,255,0.06); }
.g-lbl { font-family: var(--mono); font-size: 9px; letter-spacing: 0.1em; color: var(--fg-muted); display: block; margin-bottom: 4px; }
.g-count { font-family: var(--mono); font-size: 22px; display: block; }
.grade-a { border-color: rgba(52,211,153,0.25); }
.grade-a .g-count { color: var(--grade-a); }
.grade-b { border-color: rgba(96,165,250,0.25); }
.grade-b .g-count { color: var(--grade-b); }
.grade-c { border-color: rgba(251,191,36,0.25); }
.grade-c .g-count { color: var(--grade-c); }
.grade-d { border-color: rgba(148,163,184,0.25); }
.grade-d .g-count { color: var(--grade-d); }
.mt { margin-top: 16px; }
.brief-status { font-family: var(--mono); font-size: 10px; color: var(--fg-muted); margin-top: 4px; }

/* METRICS */
.metrics { padding: 80px 48px; border-top: 1px solid rgba(245,236,215,0.06); }
.metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2px; }
.metric { padding: 32px 28px; background: var(--bg-alt); }
.metric-value { font-family: var(--mono); font-size: 40px; color: var(--accent); margin-bottom: 12px; line-height: 1; }
.metric-label { font-family: var(--serif); font-size: 14px; line-height: 1.55; color: var(--fg-muted); }

/* HOW */
.how { padding: 100px 48px; }
.how-header { margin-bottom: 64px; }
.section-eyebrow { font-family: var(--mono); font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent); margin-bottom: 16px; }
.how-title { font-size: clamp(36px, 4vw, 52px); font-weight: 400; line-height: 1.1; }
.how-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2px; }
.step { background: var(--surface); padding: 32px 28px; }
.step-num { font-family: var(--mono); font-size: 11px; color: var(--accent); letter-spacing: 0.1em; margin-bottom: 20px; }
.step-body h3 { font-family: var(--serif); font-size: 22px; font-weight: 400; margin-bottom: 12px; }
.step-body p { font-family: var(--serif); font-size: 14px; line-height: 1.65; color: var(--fg-muted); }

/* GRADE */
.grade-section { background: var(--bg-alt); padding: 100px 48px; }
.grade-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.grade-title { font-size: clamp(36px, 4vw, 52px); font-weight: 400; line-height: 1.1; margin: 16px 0 24px; }
.grade-body { font-family: var(--serif); font-size: 16px; line-height: 1.65; color: var(--fg-muted); }
.grade-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.g-card { padding: 24px; border-radius: 6px; border: 1px solid rgba(255,255,255,0.06); }
.card-mark { font-family: var(--mono); font-size: 32px; margin-bottom: 6px; line-height: 1; }
.card-label { font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em; color: var(--fg-muted); display: block; margin-bottom: 10px; }
.card-desc { font-family: var(--serif); font-size: 13px; line-height: 1.55; color: var(--fg-muted); }
.card-a .card-mark { color: var(--grade-a); }
.card-b .card-mark { color: var(--grade-b); }
.card-c .card-mark { color: var(--grade-c); }
.card-d .card-mark { color: var(--grade-d); }

/* CLOSING */
.closing { padding: 120px 48px; }
.closing-inner { max-width: 720px; }
.closing-headline { font-size: clamp(40px, 5vw, 68px); font-weight: 400; line-height: 1.05; margin-bottom: 28px; }
.closing-body { font-family: var(--serif); font-size: 18px; line-height: 1.7; color: var(--fg-muted); }

/* FOOTER */
.footer { padding: 40px 48px; border-top: 1px solid rgba(245,236,215,0.06); display: flex; align-items: center; justify-content: space-between; }
.footer-logo { font-family: var(--mono); font-size: 14px; }
.footer-sub { font-family: var(--mono); font-size: 10px; color: var(--fg-muted); letter-spacing: 0.08em; }
.footer-copy { font-family: var(--mono); font-size: 10px; color: var(--fg-muted); }

/* RESPONSIVE */
@media (max-width: 768px) {
  .nav { padding: 20px 24px; }
  .hero { grid-template-columns: 1fr; gap: 48px; padding: 60px 24px 60px; }
  .metrics { padding: 60px 24px; }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .how { padding: 60px 24px; }
  .how-steps { grid-template-columns: 1fr 1fr; }
  .grade-section { padding: 60px 24px; }
  .grade-inner { grid-template-columns: 1fr; gap: 48px; }
  .grade-cards { grid-template-columns: 1fr; }
  .closing { padding: 80px 24px; }
  .footer { flex-direction: column; gap: 8px; padding: 32px 24px; }
}