:root {
  --canvas: #f7f7f4;
  --canvas-soft: #fafaf7;
  --surface-card: #ffffff;
  --surface-strong: #e6e5e0;
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;
  --ink: #26251e;
  --body: #5a5852;
  --muted: #807d72;
  --muted-soft: #a09c92;
  --primary: #f54e00;
  --primary-active: #d04200;
  --on-primary: #ffffff;
  --success: #1f8a65;
  --error: #cf2d56;
  --tl-thinking: #dfa88f;
  --tl-grep: #9fc9a2;
  --tl-read: #9fbbe0;
  --tl-edit: #c0a8dd;
  --tl-done: #c08532;
  --sans: "Inter", system-ui, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --max: 1200px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--body);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: -0.01em;
}

img { max-width: 100%; height: auto; display: block; }

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

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

h1, h2, h3 { color: var(--ink); font-weight: 400; margin: 0 0 16px; }
h1 { font-size: 72px; line-height: 1.1; letter-spacing: -0.03em; }
h2 { font-size: 36px; line-height: 1.2; letter-spacing: -0.02em; }
h3 { font-size: 26px; line-height: 1.25; letter-spacing: -0.0125em; }
p { margin: 0 0 16px; }

.section { padding: 80px 0; }
.section-tight { padding: 56px 0; }

.eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}

.lead { font-size: 18px; color: var(--body); max-width: 60ch; }

.top-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(247, 247, 244, 0.92);
  backdrop-filter: saturate(120%) blur(6px);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.wordmark { font-size: 18px; font-weight: 600; color: var(--ink); letter-spacing: -0.01em; }
.wordmark span { color: var(--primary); }
.nav-menu { display: flex; gap: 24px; align-items: center; }
.nav-link { font-size: 14px; font-weight: 500; color: var(--body); }
.nav-link.is-active { color: var(--ink); }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 4px 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 12px 18px;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}
.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: var(--primary-active); text-decoration: none; }
.btn-secondary { background: var(--surface-card); color: var(--ink); border-color: var(--hairline-strong); }
.btn-secondary:hover { border-color: var(--ink); text-decoration: none; }
.btn-dark { background: var(--ink); color: var(--canvas); height: 44px; padding: 12px 20px; }
.btn-dark:hover { background: #000; text-decoration: none; }
.text-link { color: var(--ink); font-weight: 500; border-bottom: 1px solid var(--hairline-strong); }
.text-link:hover { border-color: var(--ink); text-decoration: none; }

.hero { padding: 96px 0 64px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; }
.hero-actions { display: flex; gap: 16px; align-items: center; margin-top: 24px; flex-wrap: wrap; }
.hero-figure { border: 1px solid var(--hairline); border-radius: 12px; overflow: hidden; background: var(--surface-card); }
.hero-figure img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.figure-caption { font-size: 13px; color: var(--muted); padding: 12px 16px; border-top: 1px solid var(--hairline-soft); }

.badge {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--surface-strong);
  border-radius: 9999px;
  padding: 4px 10px;
}

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 24px;
}
.card h3 { font-size: 22px; }
.card .card-kicker { font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); }
.card-link { display: inline-block; margin-top: 8px; font-weight: 500; color: var(--ink); border-bottom: 1px solid var(--hairline-strong); }
.card-link:hover { border-color: var(--ink); text-decoration: none; }

.article-card { display: flex; flex-direction: column; overflow: hidden; padding: 0; }
.article-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; border-bottom: 1px solid var(--hairline); }
.article-card .article-body { padding: 20px 24px 24px; }

.feature-list { list-style: none; margin: 0; padding: 0; }
.feature-list li { padding: 16px 0; border-bottom: 1px solid var(--hairline-soft); }
.feature-list li:last-child { border-bottom: 0; }
.feature-list strong { color: var(--ink); font-weight: 600; }

.code-block {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 20px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  overflow-x: auto;
  white-space: pre;
  margin: 0 0 16px;
}

.callout {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--primary);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 0 0 24px;
}
.callout .eyebrow { margin-bottom: 8px; }

.checklist { list-style: none; margin: 0; padding: 0; }
.checklist li { position: relative; padding: 8px 0 8px 28px; color: var(--body); }
.checklist li::before { content: ""; position: absolute; left: 4px; top: 14px; width: 8px; height: 8px; border-radius: 9999px; background: var(--primary); }

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

.article-wrap { max-width: 760px; margin: 0 auto; }
.article-header { padding: 64px 0 24px; }
.article-meta { font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.article-figure { border: 1px solid var(--hairline); border-radius: 12px; overflow: hidden; margin: 0 0 24px; background: var(--surface-card); }
.article-figure img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.article-body-text h2 { font-size: 28px; margin-top: 40px; }
.article-body-text h3 { font-size: 20px; margin-top: 28px; }
.article-body-text ul, .article-body-text ol { color: var(--body); padding-left: 20px; }
.article-body-text li { margin-bottom: 8px; }

.references { font-size: 14px; }
.references li { margin-bottom: 8px; }

.related-nav { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 24px; }

.form-grid { display: grid; gap: 16px; max-width: 560px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 14px; font-weight: 600; color: var(--ink); }
.field input, .field textarea {
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  padding: 12px 16px;
  font-family: var(--sans);
  font-size: 16px;
  color: var(--ink);
}
.field textarea { min-height: 120px; resize: vertical; }
.field input:focus, .field textarea:focus { outline: 2px solid var(--primary); outline-offset: 1px; border-color: var(--primary); }
.field input:invalid:not(:placeholder-shown) { border-color: var(--error); }
.form-status { font-size: 14px; min-height: 20px; }
.form-status.is-success { color: var(--success); }
.btn[disabled] { opacity: 0.6; cursor: progress; }

.cookie-banner {
  position: fixed;
  left: 24px;
  right: 24px;
  bottom: 24px;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: 12px;
  padding: 20px 24px;
  max-width: var(--max);
  margin: 0 auto;
}
.cookie-text { margin: 0; font-size: 14px; color: var(--body); max-width: 70ch; }
.cookie-actions { display: flex; gap: 12px; flex-shrink: 0; }

.footer { border-top: 1px solid var(--hairline); padding: 64px 0 48px; margin-top: 24px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; }
.footer-heading { font-size: 16px; font-weight: 600; color: var(--ink); margin: 0 0 12px; }
.footer-link { display: block; font-size: 14px; color: var(--body); padding: 4px 0; }
.footer-note { font-size: 14px; color: var(--muted); max-width: 40ch; }
.footer-base { display: flex; justify-content: space-between; gap: 16px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--hairline-soft); flex-wrap: wrap; }
.footer-fine { font-size: 13px; color: var(--muted); margin: 0; }

@media (max-width: 1024px) {
  h1 { font-size: 56px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-menu {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 64px;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    padding: 12px 24px 20px;
  }
  .nav-menu.is-open { display: flex; }
}

@media (max-width: 640px) {
  h1 { font-size: 32px; }
  h2 { font-size: 28px; }
  .section { padding: 56px 0; }
  .hero { padding: 56px 0 40px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cookie-banner { flex-direction: column; align-items: flex-start; }
  .footer-base { flex-direction: column; }
}