/* ScalarPhase — shared stylesheet. No build step, no dependencies. */
:root {
  --bg: #070b14;
  --bg2: #0b1120;
  --panel: #0d1424;
  --line: #1c2740;
  --ink: #e9edf5;
  --muted: #9aa6bd;
  --faint: #6b7690;
  --accent: #f0a832;      /* signal amber */
  --accent-ink: #1a1206;
  --cool: #7aa2f7;        /* steel blue, secondary */
  --serif: Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --max: 1080px;
  --radius: 10px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--cool); text-decoration: none; }
a:hover { text-decoration: underline; }
::selection { background: var(--accent); color: var(--accent-ink); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 11, 20, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; letter-spacing: 0.02em; }
.brand:hover { text-decoration: none; }
.brand svg { display: block; }
.brand .wordmark { font-family: var(--serif); font-size: 21px; }
.brand .wordmark em { font-style: normal; color: var(--accent); }
nav.links { display: flex; gap: 26px; }
nav.links a { color: var(--muted); font-size: 15px; }
nav.links a:hover, nav.links a.active { color: var(--ink); text-decoration: none; }
nav.links a.active { border-bottom: 2px solid var(--accent); padding-bottom: 2px; }
.menu-btn { display: none; background: none; border: 1px solid var(--line); color: var(--ink);
  border-radius: 8px; padding: 8px 12px; font-size: 15px; cursor: pointer; }
/* Language switcher */
.lang-switch { display: inline-flex; align-items: center; gap: 2px; border: 1px solid var(--line);
  border-radius: 999px; padding: 2px; margin-left: 14px; }
.lang-switch button { appearance: none; background: transparent; border: 0; color: var(--muted);
  font-family: var(--sans); font-size: 12px; font-weight: 700; letter-spacing: .08em;
  padding: 5px 11px; border-radius: 999px; cursor: pointer; }
.lang-switch button:hover { color: var(--ink); }
.lang-switch button.active { background: var(--accent); color: var(--accent-ink); }
@media (max-width: 720px) {
  nav.links .lang-switch { margin: 12px 24px 16px; align-self: flex-start; }
  nav.links { display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg2); flex-direction: column; gap: 0; border-bottom: 1px solid var(--line); }
  nav.links.open { display: flex; }
  nav.links a { padding: 14px 24px; border-top: 1px solid var(--line); }
  .menu-btn { display: block; }
}

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
#field, #metric, #quant, #volsurf, #stars { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.55; }
#quant { opacity: 0.85; }
.hero-inner { position: relative; padding: 110px 0 90px; max-width: 780px; }
.hero.slim .hero-inner { padding: 64px 0 56px; }
.eyebrow { font-family: var(--mono); font-size: 13px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 18px; }
h1 { font-family: var(--serif); font-weight: 400; font-size: clamp(38px, 5.4vw, 60px);
  line-height: 1.12; margin: 0 0 20px; }
h1 .hl { color: var(--accent); font-style: italic; }
.lede { font-size: 20px; color: var(--muted); max-width: 640px; margin: 0 0 34px; }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 13px 26px; border-radius: 8px; font-weight: 600;
  font-size: 16px; border: 1px solid transparent; cursor: pointer; }
.btn:hover { text-decoration: none; }
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { background: #ffb84d; }
.btn.ghost { border-color: var(--line); color: var(--ink); background: rgba(255,255,255,0.02); }
.btn.ghost:hover { border-color: var(--accent); }

/* ---------- sections ---------- */
section.block { padding: 72px 0; }
section.block + section.block { border-top: 1px solid var(--line); }
.kicker { font-family: var(--mono); font-size: 13px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--faint); margin: 0 0 12px; }
h2 { font-family: var(--serif); font-weight: 400; font-size: clamp(28px, 3.4vw, 38px);
  margin: 0 0 16px; line-height: 1.2; }
h3 { font-size: 20px; margin: 0 0 10px; }
p { margin: 0 0 16px; }
.section-sub { color: var(--muted); max-width: 680px; font-size: 18px; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-top: 36px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; transition: border-color 0.2s, transform 0.2s; }
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card .tag { font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 12px; }
.card p { color: var(--muted); font-size: 15.5px; margin-bottom: 14px; }
.card .more { font-size: 15px; font-weight: 600; }

.ticks { list-style: none; padding: 0; margin: 18px 0 0; }
.ticks li { padding: 10px 0 10px 30px; position: relative; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 16px; }
.ticks li::before { content: "→"; position: absolute; left: 4px; color: var(--accent); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
@media (max-width: 820px) { .split { grid-template-columns: 1fr; } }
.stat-row { display: flex; gap: 36px; margin-top: 32px; flex-wrap: wrap; }
.stat b { display: block; font-family: var(--serif); font-size: 34px; font-weight: 400; color: var(--accent); }
.stat span { color: var(--muted); font-size: 14px; }

.quote { border-left: 3px solid var(--accent); padding: 6px 0 6px 22px; margin: 28px 0;
  font-family: var(--serif); font-size: 22px; line-height: 1.5; color: var(--ink); }
.quote cite { display: block; margin-top: 10px; font-family: var(--sans); font-style: normal;
  font-size: 14px; color: var(--faint); }

/* ---------- forms ---------- */
form.contact { max-width: 620px; margin-top: 28px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; color: var(--muted); margin-bottom: 6px; }
.field input, .field select, .field textarea {
  width: 100%; background: var(--panel); border: 1px solid var(--line); color: var(--ink);
  border-radius: 8px; padding: 12px 14px; font-size: 16px; font-family: var(--sans); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent); }
.field textarea { min-height: 140px; resize: vertical; }
.form-note { font-size: 14px; color: var(--faint); margin-top: 14px; }
.form-ok { display: none; border: 1px solid var(--accent); border-radius: var(--radius);
  padding: 18px 22px; margin-top: 20px; background: rgba(240, 168, 50, 0.07); }

/* ---------- footer ---------- */
footer.site { border-top: 1px solid var(--line); padding: 44px 0 52px; background: var(--bg2); }
.foot-grid { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.foot-grid nav { display: flex; gap: 22px; flex-wrap: wrap; }
.foot-grid nav a { color: var(--muted); font-size: 15px; }
.disclaimer { margin-top: 28px; font-size: 13px; color: var(--faint); max-width: 760px; line-height: 1.6; }
.copyright { margin-top: 14px; font-size: 13px; color: var(--faint); }