/* ChipSensei landing — dark techno system. Class vocabulary: cs-*.
   Palette mirrors ios/ChipSensei/Features/Shared/BrandColors.swift (docs/BRAND.md). */
:root {
  --bg: #0a0e14;
  --bg-2: #05080c;
  --panel: #121822;
  --panel-2: #1a2230;
  --fg: #e6edf3;
  --muted: #8b98a8;
  --faint: #5c6878;
  --accent: #22d3ee;
  --accent-2: #7dd3fc;
  --ok: #34d399;
  --warn: #f59e0b;
  --danger: #f87171;
  --line: #1f2a38;
  --line-soft: #161e29;
  --ink: #06121a;
  --glow: 0 0 0 1px var(--line), 0 24px 60px rgba(0, 0, 0, .55);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-weight: 700; letter-spacing: -0.02em; line-height: 1.12; margin: 0 0 12px; }
h1 { font-size: clamp(34px, 5vw, 56px); }
h2 { font-size: clamp(26px, 3.4vw, 36px); }
h3 { font-size: 20px; }
p { margin: 0 0 14px; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
code, .cs-mono { font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.cs-wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.cs-narrow { max-width: 760px; margin: 0 auto; padding: 0 24px; }
.cs-center { text-align: center; }
.cs-mt { margin-top: 40px; }
.cs-lede--center { margin: 0 auto; }
.cs-sec--tight { padding-top: 0; }
.cs-checks--gap { margin-top: 8px; }
.cs-foot-note { margin-top: 12px; }

/* nav */
.cs-top { position: sticky; top: 0; z-index: 10; background: rgba(10, 14, 20, .85); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line-soft); }
.cs-nav { max-width: 1080px; margin: 0 auto; padding: 14px 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.cs-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--fg); }
.cs-brand img { width: 28px; height: 28px; border-radius: 7px; }
.cs-nav a.cs-navlink { color: var(--muted); font-size: 14px; }

/* hero */
.cs-hero { position: relative; padding: 72px 0 56px; background: radial-gradient(1200px 500px at 50% -10%, rgba(34, 211, 238, .12), transparent 60%), linear-gradient(180deg, var(--bg-2), var(--bg)); border-bottom: 1px solid var(--line-soft); }
.cs-eyebrow { display: inline-block; font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
.cs-lede { color: var(--muted); font-size: 18px; max-width: 640px; }
.cs-cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 22px 0 8px; }
.cs-btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 999px; font-weight: 600; font-size: 15px; border: 1px solid transparent; }
.cs-btn--primary { background: var(--accent); color: var(--ink); }
.cs-btn--primary:hover { text-decoration: none; filter: brightness(1.07); }
.cs-btn--ghost { border-color: var(--line); color: var(--fg); background: var(--panel); }
.cs-subnote { color: var(--faint); font-size: 14px; }

/* trust strip */
.cs-trust { border-bottom: 1px solid var(--line-soft); background: var(--bg-2); }
.cs-trust-row { max-width: 1080px; margin: 0 auto; padding: 14px 24px; display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: center; color: var(--muted); font-size: 14px; }
.cs-badge { display: inline-flex; align-items: center; gap: 8px; }
.cs-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); }

/* sections */
.cs-sec { padding: 64px 0; }
.cs-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.cs-card { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 22px; box-shadow: 0 10px 30px rgba(0, 0, 0, .35); }
.cs-card h3 { display: flex; align-items: center; gap: 10px; }
.cs-icon { display: inline-flex; width: 34px; height: 34px; border-radius: 9px; align-items: center; justify-content: center; background: rgba(34, 211, 238, .12); color: var(--accent); font-size: 16px; }
.cs-card p { color: var(--muted); margin: 0; }

/* example build */
.cs-build { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; box-shadow: var(--glow); }
.cs-build-head { padding: 20px 22px; border-bottom: 1px solid var(--line-soft); display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: baseline; }
.cs-build-head h3 { margin: 0; }
.cs-build-head .cs-mono { color: var(--faint); font-size: 13px; }
.cs-ai { display: flex; gap: 10px; align-items: flex-start; margin: 16px 22px 0; padding: 12px 14px; border-radius: 12px; background: rgba(245, 158, 11, .10); border: 1px solid rgba(245, 158, 11, .35); color: var(--fg); font-size: 14px; }
.cs-ai b { color: var(--warn); }
.cs-parts { list-style: none; margin: 0; padding: 8px 0; }
.cs-part { display: grid; grid-template-columns: 34px 1fr auto; gap: 12px; align-items: center; padding: 14px 22px; border-bottom: 1px solid var(--line-soft); }
.cs-part:last-child { border-bottom: 0; }
.cs-part .cs-kind { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
.cs-part .cs-spec { font-size: 14px; color: var(--accent-2); }
.cs-part .cs-tdp { color: var(--faint); font-size: 13px; }
.cs-part .cs-buy { font-size: 13px; padding: 8px 14px; border-radius: 999px; border: 1px solid rgba(34, 211, 238, .6); color: var(--accent); white-space: nowrap; }
.cs-part .cs-buy:hover { background: rgba(34, 211, 238, .12); text-decoration: none; }
.cs-build-foot { padding: 16px 22px 20px; border-top: 1px solid var(--line-soft); display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
.cs-stat { background: var(--panel-2); border-radius: 12px; padding: 12px 14px; }
.cs-stat .l { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
.cs-stat .v { font-size: 22px; font-weight: 700; color: var(--accent); }
.cs-checks { display: flex; flex-wrap: wrap; gap: 8px; }
.cs-pill { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.cs-pill--ok { background: rgba(52, 211, 153, .14); color: var(--ok); }
.cs-pill--warn { background: rgba(245, 158, 11, .14); color: var(--warn); }
.cs-disclosure { margin: 16px 22px 20px; color: var(--muted); font-size: 13px; }

/* steps */
.cs-steps { padding: 0; margin: 0; counter-reset: step; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.cs-step { position: relative; padding: 22px 22px 22px 64px; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; }
.cs-step::before { counter-increment: step; content: counter(step); position: absolute; left: 20px; top: 20px; width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; background: var(--accent); color: var(--ink); font-weight: 700; }
.cs-step h3 { margin-bottom: 6px; font-size: 17px; }
.cs-step p { color: var(--muted); margin: 0; font-size: 15px; }

/* footer */
.cs-foot { border-top: 1px solid var(--line-soft); padding: 32px 0 48px; color: var(--faint); font-size: 14px; }
.cs-foot-row { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }
.cs-foot a { color: var(--muted); }

/* docs (privacy/terms) */
.cs-doc { max-width: 760px; margin: 0 auto; padding: 56px 24px 80px; }
.cs-doc h1 { font-size: 36px; }
.cs-doc h2 { font-size: 22px; margin-top: 32px; }
.cs-doc p, .cs-doc li { color: var(--muted); }
.cs-doc .cs-meta { color: var(--faint); font-size: 14px; }
.cs-doc ul { padding-left: 22px; }
.cs-back { display: inline-block; margin-bottom: 24px; color: var(--accent-2); }

@media (max-width: 640px) {
  .cs-hero { padding: 48px 0 40px; }
  .cs-part { grid-template-columns: 30px 1fr; }
  .cs-part .cs-buy { grid-column: 2; justify-self: start; }
  .cs-build-foot { grid-template-columns: 1fr; }
}