:root {
  --bg: #0f1b2d;
  --panel: #152540;
  --border: #2a3b55;
  --line: #1e2d44;
  --accent: #3b82f6;
  --accent-soft: #7fb3ff;
  --text: #e8eef7;
  --muted: #a9b6c9;
  --dim: #8796ad;
  --error: #fca5a5;
  --ok: #86efac;
  --max: 1120px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-soft); }
a:hover { color: #fff; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
p { margin: 0 0 1em; }
svg { max-width: 100%; height: auto; display: block; }

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

/* header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-top: 18px; padding-bottom: 18px; }
.wordmark { font-weight: 800; letter-spacing: .14em; font-size: 14px; color: var(--text); text-decoration: none; }
.nav { display: flex; gap: 22px; flex-wrap: wrap; font-size: 14px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--text); }

.eyebrow { font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--accent-soft); font-weight: 600; margin: 0 0 12px; }

/* hero */
.hero .wrap { display: grid; grid-template-columns: 1.15fr 1fr; gap: 48px; align-items: center; padding-top: 72px; padding-bottom: 80px; }
.hero h1 { font-size: clamp(30px, 4.4vw, 46px); font-weight: 800; letter-spacing: -.01em; }
.hero .lede { font-size: 18px; color: var(--muted); max-width: 34em; margin-bottom: 28px; }

.btn {
  display: inline-block; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600;
  padding: 12px 20px; border-radius: 6px; border: 0; font: inherit; font-weight: 600; cursor: pointer;
}
.btn:hover { background: #2f6fe0; color: #fff; }
.btn[disabled] { opacity: .6; cursor: progress; }

/* sections */
.section { border-top: 1px solid var(--line); }
.section > .wrap { padding-top: 56px; padding-bottom: 56px; }
.section h2 { font-size: clamp(22px, 2.6vw, 30px); }
.section .intro { color: var(--muted); max-width: 40em; }

.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 24px; }
.cards.three { grid-template-columns: repeat(3, 1fr); }
.card { border: 1px solid var(--border); border-radius: 6px; padding: 20px; }
.card h3 { font-size: 17px; }
.card p { color: var(--muted); font-size: 15px; margin: 0; }
a.card { display: block; color: inherit; text-decoration: none; transition: border-color .15s; }
a.card:hover { border-color: var(--accent); }
a.card .more { display: inline-block; margin-top: 12px; color: var(--accent-soft); font-size: 14px; }
.supporting { color: var(--dim); margin: 18px 0 0; font-size: 15px; }

.result { background: var(--panel); border-radius: 6px; padding: 20px; }
.result .client { font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--accent-soft); margin-bottom: 6px; }
.result h3 { font-size: 17px; }
.result p { color: var(--muted); font-size: 15px; margin: 0; }
.result .note { display: block; margin-top: 8px; font-size: 12px; color: var(--dim); }

.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin-top: 24px; }
.principles h3 { font-size: 17px; }
.principles p { color: var(--muted); font-size: 15px; margin: 0; }

/* diagram */
.diagram text { font-family: var(--font); }

/* contact */
.contact .wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact .aside { color: var(--muted); }
.contact .aside h2 { color: var(--text); }
form { display: grid; gap: 14px; }
.form-row { display: grid; gap: 6px; }
.form-row label { font-size: 14px; color: var(--muted); }
.form-row input, .form-row textarea {
  width: 100%; background: var(--panel); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; padding: 12px; font: inherit;
}
.form-row textarea { min-height: 140px; resize: vertical; }
.form-row input:focus, .form-row textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.field-error { color: var(--error); font-size: 13px; min-height: 0; }
.form-status { margin: 0; font-size: 15px; }
.form-status.error { color: var(--error); }
.form-status.ok { color: var(--ok); }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

/* article pages */
.article .wrap { max-width: 760px; padding-top: 56px; padding-bottom: 72px; }
.article h1 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; }
.article h2 { font-size: 22px; margin-top: 1.6em; }
.article p, .article li { color: var(--muted); }
.article ul { padding-left: 1.2em; }
.article .diagram { margin: 28px 0; background: var(--panel); border-radius: 6px; padding: 20px; }
.article .cta { margin-top: 36px; }

/* simple message pages */
.message .wrap { padding-top: 96px; padding-bottom: 120px; max-width: 640px; }

/* footer */
.site-footer { border-top: 1px solid var(--line); color: var(--dim); font-size: 14px; }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-top: 24px; padding-bottom: 32px; }
.site-footer a { color: var(--dim); }

@media (max-width: 960px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  .hero .wrap { grid-template-columns: 1fr; gap: 32px; padding-top: 48px; padding-bottom: 56px; }
  .cards, .cards.three, .principles, .contact .wrap { grid-template-columns: 1fr; }
  .contact .wrap { gap: 24px; }
  .nav { gap: 14px; }
}