/* ============================================================
   driftless — marketing + docs design system
   ============================================================ */

:root {
  /* palette */
  --bg: #0a0b0f;
  --bg-soft: #0f111a;
  --bg-elev: #141826;
  --bg-elev-2: #1a1f30;
  --border: #232838;
  --border-soft: #1b1f2d;
  --text: #e7eaf3;
  --text-soft: #aab0c2;
  --text-dim: #6e7587;
  --accent: #6ea8fe;
  --accent-2: #8b7bff;
  --accent-3: #43e0c4;
  --green: #46d39a;
  --amber: #f5b454;
  --red: #ff6b81;
  --grad: linear-gradient(120deg, #6ea8fe 0%, #8b7bff 50%, #43e0c4 100%);
  --grad-soft: linear-gradient(120deg, rgba(110,168,254,.18), rgba(139,123,255,.12) 55%, rgba(67,224,196,.14));

  /* type */
  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;

  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1120px;
  --shadow: 0 24px 60px -24px rgba(0, 0, 0, .65);
  --shadow-sm: 0 8px 24px -12px rgba(0, 0, 0, .6);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 92px; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* ambient background glow */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 480px at 78% -8%, rgba(139, 123, 255, .14), transparent 60%),
    radial-gradient(760px 420px at 8% 4%, rgba(110, 168, 254, .12), transparent 58%),
    radial-gradient(700px 600px at 50% 110%, rgba(67, 224, 196, .07), transparent 60%);
  pointer-events: none;
}

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 { line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 .5em; }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); }
h3 { font-size: 1.18rem; letter-spacing: -0.01em; }
p { margin: 0 0 1rem; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--accent);
  opacity: .6;
}

.muted { color: var(--text-soft); }
.dim { color: var(--text-dim); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: .95rem;
  font-weight: 600;
  padding: 11px 18px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--grad);
  color: #0a0b0f;
  box-shadow: 0 10px 30px -12px rgba(110, 168, 254, .7);
}
.btn-primary:hover { box-shadow: 0 14px 36px -10px rgba(139, 123, 255, .8); transform: translateY(-1px); }
.btn-ghost {
  background: rgba(255, 255, 255, .03);
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); background: rgba(110, 168, 254, .08); }

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(10, 11, 15, .72);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -0.02em; font-size: 1.05rem; }
.brand .logo { width: 26px; height: 26px; }
.nav-links { display: flex; gap: 26px; margin-left: 8px; }
.nav-links a { color: var(--text-soft); font-size: .92rem; font-weight: 500; transition: color .15s ease; }
.nav-links a:hover { color: var(--text); }
.nav-cta { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; background: none; border: 0; color: var(--text); cursor: pointer; }

/* ---------- hero ---------- */
.hero { padding: 84px 0 56px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.4rem, 5.4vw, 3.9rem);
  letter-spacing: -0.035em;
  margin-bottom: 18px;
}
.hero .lede { font-size: 1.15rem; color: var(--text-soft); max-width: 36ch; margin-bottom: 28px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 22px; }
.hero-meta { display: flex; gap: 22px; flex-wrap: wrap; color: var(--text-dim); font-size: .85rem; }
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, .03);
  font-size: .8rem;
  color: var(--text-soft);
  margin-bottom: 22px;
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 3px rgba(70, 211, 154, .18); }

/* ---------- terminal ---------- */
.terminal {
  background: linear-gradient(180deg, #0d0f18, #0b0d14);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.term-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 14px;
  background: rgba(255, 255, 255, .02);
  border-bottom: 1px solid var(--border-soft);
}
.term-dot { width: 11px; height: 11px; border-radius: 50%; }
.term-dot.r { background: #ff5f57; }
.term-dot.y { background: #febc2e; }
.term-dot.g { background: #28c840; }
.term-title { margin-left: 10px; font-family: var(--font-mono); font-size: .76rem; color: var(--text-dim); }
.term-body {
  padding: 18px 18px 22px;
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.75;
  overflow-x: auto;
}
.term-body .l { white-space: pre; }
.term-body .prompt { color: var(--accent-3); }
.term-body .cmd { color: var(--text); }
.term-body .comment { color: var(--text-dim); }
.term-body .ok { color: var(--green); }
.term-body .warn { color: var(--amber); }
.term-body .bad { color: var(--red); }
.term-body .key { color: var(--accent); }
.term-body .arrow { color: var(--accent-2); }

/* ---------- sections ---------- */
section { padding: 64px 0; }
.section-head { max-width: 620px; margin-bottom: 44px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head p { color: var(--text-soft); font-size: 1.05rem; margin: 0; }

.divider { height: 1px; background: var(--border-soft); border: 0; margin: 0; }

/* problem callout */
.problem {
  background:
    var(--grad-soft),
    var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
}
.problem-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; align-items: center; }
.problem ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.problem li { display: flex; gap: 12px; align-items: flex-start; color: var(--text-soft); }
.problem li b { color: var(--text); font-weight: 600; }
.x-icon { color: var(--red); flex: 0 0 auto; margin-top: 3px; }

/* two dependencies */
.dep-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.dep-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform .18s ease, border-color .18s ease;
}
.dep-card:hover { transform: translateY(-3px); border-color: #2c3346; }
.dep-card h3 { margin: 0 0 8px; font-size: 1.15rem; }
.dep-card p { color: var(--text-soft); font-size: .94rem; margin: 0; }
.dep-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase;
  padding: 4px 11px; border-radius: 999px; margin-bottom: 16px;
}
.dep-tag.external { color: var(--amber); background: rgba(245, 180, 84, .12); border: 1px solid rgba(245, 180, 84, .3); }
.dep-tag.internal { color: var(--accent-3); background: rgba(67, 224, 196, .12); border: 1px solid rgba(67, 224, 196, .3); }
.dep-trigger { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--border-soft); font-family: var(--font-mono); font-size: .8rem; color: var(--text-dim); }
.dep-trigger code { color: var(--accent); }
.dep-foot { text-align: center; margin-top: 24px; font-size: 1rem; }

/* pipeline */
.pipeline {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
}
.pipe-step { padding: 22px 18px; border-right: 1px solid var(--border-soft); position: relative; }
.pipe-step:last-child { border-right: 0; }
.pipe-step .n {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 7px;
  display: inline-block;
  margin-bottom: 12px;
}
.pipe-step h4 { font-size: .98rem; margin: 0 0 6px; font-family: var(--font-mono); }
.pipe-step p { font-size: .82rem; color: var(--text-dim); margin: 0; }

/* feature cards */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}
.card:hover { transform: translateY(-3px); border-color: #2c3346; background: var(--bg-elev-2); }
.card .ic {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  border-radius: 11px;
  background: var(--grad-soft);
  border: 1px solid var(--border);
  margin-bottom: 16px;
  color: var(--accent);
}
.card h3 { margin-bottom: 8px; }
.card p { color: var(--text-soft); font-size: .92rem; margin: 0; }

/* evidence / scorecard */
.evidence-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: center; }
.scorecard {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.scorecard .sc-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border-soft);
  font-family: var(--font-mono); font-size: .82rem; color: var(--text-soft);
}
.status-pill {
  font-family: var(--font-mono); font-size: .74rem; font-weight: 600;
  padding: 4px 10px; border-radius: 999px; letter-spacing: .04em;
}
.status-pill.pass { background: rgba(70, 211, 154, .14); color: var(--green); border: 1px solid rgba(70, 211, 154, .35); }
table.sc { width: 100%; border-collapse: collapse; font-size: .88rem; }
table.sc th, table.sc td { padding: 12px 20px; text-align: left; }
table.sc thead th { font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-dim); font-weight: 600; border-bottom: 1px solid var(--border-soft); }
table.sc tbody tr { border-bottom: 1px solid var(--border-soft); }
table.sc tbody tr:last-child { border-bottom: 0; }
table.sc td.metric { color: var(--text-soft); font-family: var(--font-mono); font-size: .82rem; }
table.sc td .num { font-family: var(--font-mono); }
.delta-up { color: var(--green); }
.delta-flat { color: var(--text-dim); }
.delta-down { color: var(--red); }

.checklist { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 12px; }
.checklist li { display: flex; gap: 12px; align-items: flex-start; color: var(--text-soft); }
.check-icon { color: var(--green); flex: 0 0 auto; margin-top: 3px; }

/* code tabs */
.code-tabs { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--bg-soft); box-shadow: var(--shadow-sm); }
.tabs-bar { display: flex; gap: 2px; padding: 8px 8px 0; background: rgba(255,255,255,.02); border-bottom: 1px solid var(--border-soft); overflow-x: auto; }
.tab {
  font-family: var(--font-mono); font-size: .8rem; color: var(--text-dim);
  background: none; border: 0; padding: 9px 14px; cursor: pointer; border-radius: 8px 8px 0 0;
  border-bottom: 2px solid transparent; white-space: nowrap;
}
.tab:hover { color: var(--text-soft); }
.tab.active { color: var(--text); background: var(--bg); border-bottom-color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* principles */
.principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.principle { display: flex; gap: 16px; padding: 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-elev); }
.principle .pn { font-family: var(--font-mono); color: var(--accent); font-size: 1.1rem; flex: 0 0 auto; }
.principle h3 { font-size: 1rem; margin-bottom: 6px; }
.principle p { font-size: .9rem; color: var(--text-soft); margin: 0; }

/* CTA */
.cta {
  text-align: center;
  background: var(--grad-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 56px 40px;
}
.cta h2 { margin-bottom: 12px; }
.cta p { color: var(--text-soft); max-width: 48ch; margin: 0 auto 24px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* footer */
.footer { border-top: 1px solid var(--border-soft); padding: 40px 0; color: var(--text-dim); font-size: .88rem; }
.footer-inner { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; align-items: center; }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-links a:hover { color: var(--text); }

/* inline code */
code.inline {
  font-family: var(--font-mono);
  font-size: .85em;
  background: rgba(255, 255, 255, .06);
  border: 1px solid var(--border-soft);
  padding: 1px 6px;
  border-radius: 6px;
  color: var(--accent);
}

/* copy button */
.copy-btn {
  position: absolute; top: 10px; right: 10px;
  font-family: var(--font-mono); font-size: .72rem;
  background: rgba(255,255,255,.05); border: 1px solid var(--border);
  color: var(--text-soft); padding: 4px 9px; border-radius: 7px; cursor: pointer;
  opacity: 0; transition: opacity .15s ease, color .15s ease;
}
.has-copy { position: relative; }
.has-copy:hover .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.copy-btn.copied { color: var(--green); border-color: rgba(70,211,154,.4); }

/* ============================================================
   DOCS
   ============================================================ */
.docs-layout { display: grid; grid-template-columns: 248px minmax(0, 1fr); gap: 48px; align-items: start; padding: 40px 0 80px; }
.docs-sidebar {
  position: sticky; top: 88px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  padding-right: 8px;
}
.docs-sidebar h5 {
  font-size: .72rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--text-dim); margin: 22px 0 8px; font-weight: 700;
}
.docs-sidebar h5:first-child { margin-top: 0; }
.docs-sidebar a {
  display: block; padding: 6px 12px; border-radius: 8px;
  color: var(--text-soft); font-size: .9rem; border-left: 2px solid transparent;
  transition: color .12s ease, background .12s ease;
}
.docs-sidebar a:hover { color: var(--text); background: rgba(255,255,255,.03); }
.docs-sidebar a.active { color: var(--text); background: rgba(110,168,254,.1); border-left-color: var(--accent); }

.docs-content { max-width: 760px; min-width: 0; }
.docs-content h1 { font-size: 2.2rem; letter-spacing: -0.03em; margin-bottom: 8px; }
.docs-content .doc-lede { font-size: 1.1rem; color: var(--text-soft); margin-bottom: 8px; }
.docs-content section { padding: 36px 0 0; scroll-margin-top: 88px; }
.docs-content section:first-of-type { padding-top: 24px; }
.docs-content h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border-soft); padding-bottom: 10px; margin-bottom: 18px; }
.docs-content h3 { margin-top: 26px; }
.docs-content p, .docs-content li { color: var(--text-soft); }
.docs-content strong { color: var(--text); }
.docs-content ul, .docs-content ol { padding-left: 22px; }
.docs-content li { margin-bottom: 7px; }

pre {
  background: #0c0e16;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.65;
  margin: 0 0 18px;
}
pre code { color: var(--text); white-space: pre; }
.tok-c { color: var(--text-dim); }
.tok-k { color: var(--accent-2); }
.tok-s { color: var(--accent-3); }
.tok-p { color: var(--accent); }

.doc-table { width: 100%; border-collapse: collapse; font-size: .9rem; margin: 0 0 20px; }
.doc-table th, .doc-table td { text-align: left; padding: 10px 14px; border: 1px solid var(--border-soft); vertical-align: top; }
.doc-table th { background: var(--bg-elev); font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; color: var(--text-soft); }
.doc-table td code { font-family: var(--font-mono); color: var(--accent); font-size: .85em; }

.callout {
  display: flex; gap: 14px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  background: rgba(110,168,254,.06);
  border-radius: var(--radius-sm);
  padding: 14px 18px; margin: 0 0 20px;
}
.callout.warn { border-left-color: var(--amber); background: rgba(245,180,84,.06); }
.callout.good { border-left-color: var(--green); background: rgba(70,211,154,.06); }
.callout p { margin: 0; font-size: .9rem; }
.callout .ci { flex: 0 0 auto; margin-top: 2px; }

.status-tag { font-family: var(--font-mono); font-size: .76rem; padding: 2px 9px; border-radius: 999px; font-weight: 600; }
.status-tag.pass { background: rgba(70,211,154,.14); color: var(--green); }
.status-tag.partial { background: rgba(245,180,84,.14); color: var(--amber); }
.status-tag.blocked { background: rgba(255,107,129,.14); color: var(--red); }
.status-tag.change { background: rgba(110,168,254,.14); color: var(--accent); }

/* ---------- responsive ---------- */
@media (max-width: 940px) {
  .hero-grid, .problem-grid, .evidence-grid, .dep-grid { grid-template-columns: 1fr; gap: 36px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .pipeline { grid-template-columns: repeat(2, 1fr); }
  .pipe-step { border-bottom: 1px solid var(--border-soft); }
  .principles { grid-template-columns: 1fr; }
  .docs-layout { grid-template-columns: 1fr; }
  .docs-sidebar {
    position: static; max-height: none;
    border: 1px solid var(--border); border-radius: var(--radius);
    padding: 16px; margin-bottom: 8px;
  }
}
@media (max-width: 680px) {
  .nav-links { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav.open .nav-links {
    display: flex; flex-direction: column; gap: 4px;
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg-soft); border-bottom: 1px solid var(--border);
    padding: 14px 24px;
  }
  .feature-grid { grid-template-columns: 1fr; }
  .pipeline { grid-template-columns: 1fr; }
  .hero { padding: 52px 0 36px; }
  .problem, .cta { padding: 28px; }
}