/* QuillStack — site styles. Mirrors the app's STYLE_GUIDE.md:
   dark, utilitarian, monochrome chrome, color reserved for tags. */

:root {
  /* Surfaces (tonal stepping) */
  --base: #0E0E0E;
  --container-low: #131313;
  --container: #1A1919;
  --container-high: #222222;
  --container-highest: #262626;
  --bright: #393939;

  /* Primary */
  --primary: #E0E0E0;
  --on-primary-dark: #0E0E0E;

  /* Text hierarchy — never pure #FFF for body (OLED haloing) */
  --on-surface: #E5E2E1;
  --on-surface-variant: #ADAAAA;
  --on-surface-muted: #737070;

  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --maxw: 860px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--on-surface-variant);
  background: var(--base);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--on-surface); text-decoration: none; }
a:hover { color: var(--primary); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--container-low);
  border-bottom: 1px solid var(--container);
}
.site-header .inner {
  max-width: none;          /* full-width bar: logo hugs the top-left corner */
  margin: 0;
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 13px; }
.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 24%;
  /* brighter edge ring + soft glow so the mark stands out against the dark bar */
  box-shadow:
    0 0 0 1px rgba(229, 226, 225, 0.22),
    0 0 24px rgba(224, 224, 224, 0.12);
  flex-shrink: 0;
}
.wordmark {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.42em;
  color: var(--primary);
  text-shadow: 0 0 20px rgba(224, 224, 224, 0.20), 0 0 50px rgba(224, 224, 224, 0.08);
  white-space: nowrap;
}
.site-nav {
  display: flex;
  gap: 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.site-nav a { color: var(--on-surface-muted); }
.site-nav a:hover { color: var(--primary); }

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

.section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--on-surface-muted);
  margin-bottom: 14px;
}

/* ---------- Hero ---------- */
.hero { padding: 96px 0 72px; text-align: center; }
.hero h1 {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--on-surface);
  margin-bottom: 20px;
}
.hero h1 strong { font-weight: 600; color: var(--primary); }
.hero p.lede {
  font-size: 1.15rem;
  max-width: 30em;
  margin: 0 auto 32px;
  color: var(--on-surface-variant);
}

/* ---------- Tag chips (the only color) ---------- */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}
.chip {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 9px;
  border-radius: 0;               /* sharp rectangles */
  line-height: 1;
}

/* ---------- App-icon tile ---------- */
.app-icon {
  display: block;
  width: 76px;
  height: 76px;
  margin: 0 auto 28px;
  border-radius: 22%;              /* iOS squircle-ish */
  /* faint ring separates the near-black icon bg from the page; soft glow to lift it */
  box-shadow:
    0 0 0 1px rgba(229, 226, 225, 0.08),
    0 10px 34px rgba(0, 0, 0, 0.6),
    0 0 44px rgba(224, 224, 224, 0.05);
}

/* ---------- Capture-button motif ---------- */
.capture-dot {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary);
  margin: 0 auto 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 12px rgba(224,224,224,0.25), 0 0 30px rgba(224,224,224,0.08);
}
.capture-dot svg { width: 24px; height: 24px; fill: var(--on-primary-dark); }

/* ---------- Features ---------- */
.features { padding: 40px 0 72px; }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px;
  background: var(--container);        /* hairline gutters via gap */
  border: 1px solid var(--container);
}
.feature {
  background: var(--base);
  padding: 24px 22px;
}
.feature h3 {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1rem;
  color: var(--on-surface);
  margin-bottom: 8px;
}
.feature p { font-size: 0.92rem; color: var(--on-surface-variant); }

/* ---------- Content pages (privacy / terms) ---------- */
.doc { padding: 56px 0 80px; }
.doc h1 {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(2rem, 5vw, 2.8rem);
  letter-spacing: -0.02em;
  color: var(--on-surface);
  margin-bottom: 6px;
}
.doc .updated {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--on-surface-muted);
  margin-bottom: 40px;
}
.doc h2 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.3rem;
  color: var(--on-surface);
  margin: 40px 0 14px;
}
.doc h3 {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1.05rem;
  color: var(--on-surface);
  margin: 26px 0 10px;
}
.doc p, .doc li { color: var(--on-surface-variant); }
.doc p { margin-bottom: 14px; }
.doc ul { margin: 0 0 16px 22px; }
.doc li { margin-bottom: 7px; }
.doc strong { color: var(--on-surface); font-weight: 600; }
.doc a { text-decoration: underline; text-underline-offset: 2px; }
.doc hr { border: none; border-top: 1px solid var(--container-high); margin: 36px 0; }

.doc .callout {
  background: var(--container);
  border-left: 2px solid var(--bright);
  padding: 16px 18px;
  margin: 0 0 28px;
  font-size: 0.95rem;
}

/* Tables */
.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: 4px 0 24px;
  font-size: 0.86rem;
  display: block;
  overflow-x: auto;
}
.doc th, .doc td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--container-high);
  vertical-align: top;
}
.doc th {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--on-surface-muted);
  font-weight: 400;
  white-space: nowrap;
}
.doc td { color: var(--on-surface-variant); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--container);
  background: var(--container-low);
  padding: 32px 0;
}
.site-footer .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.site-footer .foot-links {
  display: flex;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.site-footer .foot-links a { color: var(--on-surface-muted); }
.site-footer .foot-links a:hover { color: var(--primary); }
.site-footer .copy {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--on-surface-muted);
}

@media (max-width: 560px) {
  .site-header .inner { flex-direction: column; align-items: flex-start; gap: 12px; }
  .hero { padding: 64px 0 48px; }
}