/* Tessera landing site — shared stylesheet
 * Brand tokens mirror packages/tessera_shared/lib/atlas/theme.dart (Atlas Edition v2.0).
 * Hand-written CSS; no build step. Cloudflare Pages zero-config compatible.
 */

:root {
  --paper: #FBFBF8;
  --paper2: #FFFFFF;
  --paperWarm: #F7F5EE;
  --paperGrain: #F4F2EC;
  --paper3: #EFEFEB;
  --paper4: #DEDED7;
  --ink: #0A0908;
  --ink2: #3D3A37;
  --ink3: #6B6660;
  --ink4: #9A938B;
  --vermilion: #FF3D14;
  --vermilion-dim: #DD4422;
  --rule: #DEDED7;

  --font-display: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --radius-sm: 2px;
  --radius-md: 6px;
  --radius-lg: 18px;

  --max-w: 1120px;
  --gutter: 24px;
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  font-feature-settings: "kern", "liga", "calt";
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Type scale ──────────────────────────────────────────────────────────── */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 0.6em;
  color: var(--ink);
}

h1 { font-size: clamp(2.4rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.5rem); }
h3 { font-size: clamp(1.3rem, 2.2vw, 1.65rem); }
h4 { font-size: 1.1rem; }

p { margin: 0 0 1em; }
p.lead { font-size: 1.2rem; color: var(--ink2); }

a { color: var(--vermilion); text-decoration: none; }
a:hover { text-decoration: underline; }

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--paper3);
  padding: 1px 6px;
  border-radius: 3px;
}

ul, ol { padding-left: 1.3em; margin: 0 0 1em; }
ul li, ol li { margin-bottom: 0.4em; }

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 64px 0;
}

/* ── Layout primitives ───────────────────────────────────────────────────── */

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: 96px 0; }
.section-tight { padding: 56px 0; }

/* ── Nav ─────────────────────────────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 251, 248, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--rule);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.nav-brand:hover { text-decoration: none; }

.nav-brand img { width: 28px; height: 28px; }

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--ink2);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-links a.active { color: var(--vermilion); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle svg { width: 24px; height: 24px; stroke: var(--ink); }

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--paper2);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-bottom: 1px solid var(--rule);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 16px var(--gutter);
    border-top: 1px solid var(--rule);
  }
  .nav-links a:first-child { border-top: 0; }
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */

.btn {
  display: inline-block;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  text-align: center;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.1s, background 0.15s, border-color 0.15s;
  text-decoration: none;
  line-height: 1.2;
}

.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--vermilion);
  color: var(--paper2);
  border-color: var(--vermilion);
}
.btn-primary:hover { background: #E63310; border-color: #E63310; }

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink2);
}
.btn-secondary:hover { background: var(--ink); color: var(--paper2); border-color: var(--ink); }

.btn-ghost {
  background: transparent;
  color: var(--ink2);
  border-color: transparent;
  padding: 14px 18px;
}
.btn-ghost:hover { color: var(--ink); }

.btn-lg { padding: 18px 36px; font-size: 1.075rem; }

/* ── Hero ────────────────────────────────────────────────────────────────── */

.hero {
  padding: 96px 0 64px;
  background: linear-gradient(180deg, var(--paperWarm) 0%, var(--paper) 100%);
  border-bottom: 1px solid var(--rule);
}

.hero h1 {
  max-width: 18ch;
  margin-bottom: 0.4em;
}

.hero h1 em {
  font-style: italic;
  color: var(--vermilion);
  font-weight: 600;
}

.hero-lead {
  max-width: 56ch;
  font-size: 1.2rem;
  color: var(--ink2);
  margin-bottom: 36px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}

.hero-meta {
  margin-top: 28px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink3);
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.hero-meta span::before {
  content: "✓ ";
  color: var(--vermilion);
  font-weight: 700;
}

/* ── Feature cards ───────────────────────────────────────────────────────── */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--paper2);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: transform 0.15s, border-color 0.15s;
}

.feature-card:hover {
  transform: translateY(-2px);
  border-color: var(--ink4);
}

.feature-card .icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--paperGrain);
  border-radius: var(--radius-md);
  margin-bottom: 18px;
}
.feature-card .icon svg { width: 24px; height: 24px; stroke: var(--vermilion); fill: none; stroke-width: 1.8; }

.feature-card h3 { font-size: 1.3rem; margin-bottom: 10px; }
.feature-card p { color: var(--ink2); margin-bottom: 0; font-size: 0.97rem; }

/* ── Stat strip ──────────────────────────────────────────────────────────── */

.stats {
  background: var(--paperGrain);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 56px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
  text-align: center;
}

.stat .n {
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 600;
  color: var(--vermilion);
  letter-spacing: -0.02em;
  line-height: 1;
}

.stat .l {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink3);
  margin-top: 8px;
}

/* ── Pricing table ───────────────────────────────────────────────────────── */

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 40px 0;
}

@media (max-width: 720px) { .pricing-grid { grid-template-columns: 1fr; } }

.pricing-card {
  background: var(--paper2);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  border-color: var(--vermilion);
  border-width: 2px;
  position: relative;
}

.pricing-card.featured::before {
  content: "Pro";
  position: absolute;
  top: -12px;
  left: 32px;
  background: var(--vermilion);
  color: var(--paper2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

.pricing-card h3 { font-size: 1.5rem; margin-bottom: 8px; }
.pricing-card .price {
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 6px;
}
.pricing-card .price small { font-size: 1rem; font-weight: 400; color: var(--ink3); }
.pricing-card .blurb { color: var(--ink2); margin-bottom: 24px; }
.pricing-card ul { list-style: none; padding: 0; margin: 0 0 28px; }
.pricing-card li {
  padding: 10px 0;
  border-top: 1px solid var(--rule);
  font-size: 0.97rem;
  color: var(--ink2);
}
.pricing-card li:first-child { border-top: 0; }
.pricing-card li::before {
  content: "→";
  color: var(--vermilion);
  margin-right: 10px;
  font-weight: 600;
}
.pricing-card li.muted { color: var(--ink4); }
.pricing-card li.muted::before { content: "—"; color: var(--ink4); }
.pricing-card .btn { margin-top: auto; }

/* Comparison table */
.compare {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper2);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-size: 0.96rem;
}
.compare th, .compare td {
  padding: 14px 18px;
  text-align: left;
  border-top: 1px solid var(--rule);
}
.compare thead th { background: var(--paperGrain); border-top: 0; font-weight: 600; }
.compare th:not(:first-child), .compare td:not(:first-child) { text-align: center; }
.compare .yes { color: var(--vermilion); font-weight: 600; }
.compare .no { color: var(--ink4); }

/* ── Article / prose ─────────────────────────────────────────────────────── */

.prose {
  max-width: 70ch;
  margin: 0 auto;
}
.prose h2 { margin-top: 1.6em; }
.prose h3 { margin-top: 1.3em; }
.prose blockquote {
  border-left: 3px solid var(--vermilion);
  margin: 24px 0;
  padding: 8px 0 8px 20px;
  color: var(--ink2);
  font-style: italic;
}
.prose img { max-width: 100%; height: auto; border-radius: var(--radius-md); }

/* ── Footer ──────────────────────────────────────────────────────────────── */

.footer {
  border-top: 1px solid var(--rule);
  padding: 64px 0 48px;
  background: var(--paperWarm);
  color: var(--ink2);
  font-size: 0.94rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

.footer h4 {
  font-family: var(--font-body);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink3);
  margin-bottom: 14px;
}

.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 8px; }
.footer a { color: var(--ink2); }
.footer a:hover { color: var(--vermilion); }

.footer-tagline {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--ink3);
  margin-top: 8px;
}

.footer-bottom {
  border-top: 1px solid var(--rule);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--ink3);
  flex-wrap: wrap;
  gap: 12px;
}

/* ── Utilities ───────────────────────────────────────────────────────────── */

.text-center { text-align: center; }
.text-mono { font-family: var(--font-mono); }
.text-dim { color: var(--ink3); }
.muted { color: var(--ink3); }
.pill {
  display: inline-block;
  padding: 4px 10px;
  background: var(--paperGrain);
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink3);
}
.pill-accent {
  background: rgba(255, 61, 20, 0.08);
  border-color: rgba(255, 61, 20, 0.2);
  color: var(--vermilion);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--vermilion);
  margin-bottom: 14px;
}

/* Sr-only */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Skip link */
.skip {
  position: absolute; left: 0; top: -40px;
  background: var(--ink); color: var(--paper2);
  padding: 8px 14px; z-index: 100;
  border-radius: 0 0 var(--radius-md) 0;
}
.skip:focus { top: 0; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}