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

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-weight: 400;
  letter-spacing: -0.015em;
  background: var(--canvas);
  color: var(--body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 {
  color: var(--ink);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 { font-size: 72px; letter-spacing: -0.03em; line-height: 1.1; }
h2 { font-size: 36px; }
h3 { font-size: 26px; line-height: 1.25; }
h4 { font-size: 22px; font-weight: 600; letter-spacing: 0; }

p { margin-bottom: 16px; }
p:last-child { margin-bottom: 0; }

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

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

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

.top-nav {
  height: 64px;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  position: sticky;
  top: 0;
  z-index: 50;
}

.top-nav .container {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.wordmark {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.wordmark span { color: var(--primary); }

.nav-menu {
  display: flex;
  gap: 28px;
  list-style: none;
  align-items: center;
}
.nav-menu a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}
.nav-menu a:hover { text-decoration: none; color: var(--primary); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  width: 40px;
  height: 40px;
  cursor: pointer;
  font-size: 18px;
  color: var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: background 0.15s ease;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  padding: 10px 18px;
  height: 40px;
  border-radius: 8px;
}
.btn-primary:hover { background: var(--primary-active); color: var(--on-primary); }

.btn-secondary {
  background: var(--surface-card);
  color: var(--ink);
  border: 1px solid var(--hairline-strong);
  padding: 10px 18px;
  height: 40px;
  border-radius: 8px;
}

.btn-download {
  background: var(--ink);
  color: var(--canvas);
  padding: 12px 20px;
  height: 44px;
  border-radius: 8px;
}
.btn-download:hover { color: var(--canvas); }

.text-link {
  color: var(--ink);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.hero {
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--hairline);
}
.hero h1 { max-width: 14ch; margin-bottom: 24px; }
.hero .lead { max-width: 60ch; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }

.feature-card-mock {
  margin-top: 56px;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  overflow: hidden;
}
.feature-card-mock img {
  width: 100%;
  height: auto;
  display: block;
}
.feature-card-mock figcaption {
  font-size: 13px;
  color: var(--muted);
  padding: 12px 20px;
  border-top: 1px solid var(--hairline);
  background: var(--canvas-soft);
}

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

.card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 24px;
}
.card h4 { margin-bottom: 8px; }
.card p { color: var(--body); font-size: 15px; }

.article-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
}
.article-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--hairline);
}
.article-card .body { padding: 24px; }
.article-card .meta {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}
.article-card h4 { margin-bottom: 8px; }
.article-card .read { margin-top: 16px; }

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

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

.code-block {
  background: var(--surface-card);
  color: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 20px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
}

.divider { border: none; border-top: 1px solid var(--hairline); margin: 0; }

.article-body { max-width: 760px; }
.article-body h1 { font-size: 48px; margin-bottom: 16px; }
.article-body h2 { font-size: 28px; margin: 40px 0 16px; }
.article-body h3 { font-size: 20px; font-weight: 600; letter-spacing: 0; margin: 28px 0 12px; }
.article-body p { color: var(--body); margin-bottom: 18px; }
.article-body ul, .article-body ol { margin: 0 0 18px 22px; color: var(--body); }
.article-body li { margin-bottom: 8px; }
.article-body figure { margin: 28px 0; }
.article-body figure img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--hairline);
  display: block;
}
.article-body figcaption { font-size: 13px; color: var(--muted); margin-top: 8px; }

.article-hero-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.updated { font-size: 13px; color: var(--muted); }

.toc {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 32px;
}
.toc strong { display: block; font-size: 11px; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.toc ul { list-style: none; }
.toc li { margin-bottom: 6px; }
.toc a { color: var(--ink); font-size: 15px; }

.references { margin-top: 40px; }
.references ol { margin-left: 22px; }
.references a { color: var(--ink); text-decoration: underline; word-break: break-word; }

table.spec {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
}
table.spec th, table.spec td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline);
}
table.spec th { color: var(--ink); font-weight: 600; background: var(--canvas-soft); }
table.spec td { color: var(--body); }

.form-wrap {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 32px;
  max-width: 560px;
}
.form-field { margin-bottom: 20px; }
.form-field label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}
.form-field input {
  width: 100%;
  height: 44px;
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  padding: 12px 16px;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
}
.form-field input:focus { outline: 2px solid var(--primary); outline-offset: 1px; border-color: var(--primary); }
.form-message {
  display: none;
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  background: rgba(31, 138, 101, 0.12);
  color: var(--success);
  border: 1px solid rgba(31, 138, 101, 0.3);
}
.form-message.show { display: block; }
.btn[disabled] { opacity: 0.6; cursor: progress; }

.cta-band { padding: 96px 0; text-align: center; border-top: 1px solid var(--hairline); }
.cta-band h2 { margin-bottom: 24px; }

.footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 48px 0;
  color: var(--body);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 32px; }
.footer-grid h5 {
  font-size: 11px;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
  font-weight: 600;
}
.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; }
.footer a { color: var(--body); font-size: 14px; }
.footer a:hover { color: var(--ink); text-decoration: none; }
.footer .brand-col p { font-size: 14px; color: var(--muted); max-width: 36ch; }
.footer-bottom {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
  font-size: 13px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.cookie-banner {
  position: fixed;
  bottom: 24px;
  left: 24px;
  right: 24px;
  max-width: 560px;
  margin: 0 auto;
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: 12px;
  padding: 20px 24px;
  z-index: 100;
  display: none;
}
.cookie-banner.show { display: block; }
.cookie-banner p { font-size: 14px; color: var(--body); margin-bottom: 16px; }
.cookie-actions { display: flex; gap: 12px; }
.cookie-actions .btn { height: 36px; padding: 8px 16px; }

.disclaimer { font-size: 13px; color: var(--muted-soft); margin-top: 8px; }

.breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.breadcrumb a { color: var(--muted); }

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

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    flex-direction: column;
    padding: 16px 24px;
    gap: 16px;
  }
  .nav-menu.open { display: flex; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
}

@media (max-width: 640px) {
  h1 { font-size: 32px; }
  h2 { font-size: 28px; }
  .hero { padding: 56px 0; }
  .section { padding: 56px 0; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .article-body h1 { font-size: 32px; }
}