: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;
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;
  --r-pill: 9999px;
  --maxw: 1200px;
  --section: 80px;
  --font: "Inter", system-ui, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

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

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

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

h1, h2, h3, h4 { color: var(--ink); font-weight: 400; margin: 0 0 16px; }
h1 { font-size: 72px; line-height: 1.1; letter-spacing: -2.16px; }
h2 { font-size: 36px; line-height: 1.2; letter-spacing: -0.72px; }
h3 { font-size: 26px; line-height: 1.25; letter-spacing: -0.325px; }
h4 { font-size: 22px; line-height: 1.3; letter-spacing: -0.11px; }
p { margin: 0 0 16px; }

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

.section { padding: var(--section) 0; }
.section--tight { padding: 48px 0; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--canvas);
  padding: 10px 16px;
  border-radius: var(--r-md);
  z-index: 200;
}
.skip-link:focus { left: 16px; top: 16px; }

.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
}
.top-nav__inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.wordmark {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.2px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.wordmark__dot { color: var(--primary); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}
.nav-links a:hover { color: var(--primary); text-decoration: none; }
.nav-toggle {
  display: none;
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-md);
  width: 40px;
  height: 40px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 16px;
  height: 2px;
  background: var(--ink);
  position: relative;
}
.nav-toggle span::before { position: absolute; top: -5px; }
.nav-toggle span::after { position: absolute; top: 5px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--r-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: background .15s ease, color .15s ease;
}
.btn--primary { background: var(--primary); color: var(--on-primary); padding: 10px 18px; height: 40px; }
.btn--primary:hover { background: var(--primary-active); text-decoration: none; color: var(--on-primary); }
.btn--ink { background: var(--ink); color: var(--canvas); padding: 12px 20px; height: 44px; }
.btn--ink:hover { background: #16150f; color: var(--canvas); text-decoration: none; }
.btn--secondary { background: var(--surface-card); color: var(--ink); border-color: var(--hairline-strong); padding: 10px 18px; height: 40px; }
.btn--secondary: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 p.lead { font-size: 18px; color: var(--body); max-width: 48ch; }
.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.hero__media {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.hero__media img { width: 100%; height: 360px; object-fit: cover; }
.hero__media figcaption {
  font-size: 13px;
  color: var(--muted);
  padding: 12px 16px;
  border-top: 1px solid var(--hairline);
}

.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: var(--r-pill);
  padding: 4px 10px;
  margin-bottom: 16px;
}

.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: var(--r-lg);
  padding: 24px;
}
.card h3, .card h4 { margin-bottom: 8px; }
.card .label { margin-bottom: 8px; }
.card p { margin-bottom: 0; }

.card-link { display: block; color: inherit; }
.card-link:hover { text-decoration: none; border-color: var(--hairline-strong); }
.card-link:hover h4 { color: var(--primary); }

.section-head { max-width: 64ch; margin-bottom: 48px; }
.section-head p { color: var(--body); margin-bottom: 0; }

.steps { counter-reset: step; display: grid; gap: 16px; }
.step {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: 24px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.step__num {
  counter-increment: step;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  min-width: 28px;
}
.step__num::before { content: counter(step, decimal-leading-zero); }
.step h4 { margin-bottom: 4px; }
.step p { margin-bottom: 0; color: var(--body); }

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

.fact-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.fact-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border-bottom: 1px solid var(--hairline-soft);
  padding-bottom: 12px;
}
.fact-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.fact-list .marker { color: var(--primary); font-family: var(--mono); font-size: 13px; }

.article-body { max-width: 72ch; }
.article-body h2 { margin-top: 48px; }
.article-body h3 { margin-top: 32px; }
.article-body ul, .article-body ol { color: var(--body); padding-left: 22px; }
.article-body li { margin-bottom: 8px; }
.article-meta { color: var(--muted); font-size: 14px; margin-bottom: 24px; }
.article-figure {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
  margin: 32px 0;
}
.article-figure img { width: 100%; height: 320px; object-fit: cover; }
.article-figure figcaption { font-size: 13px; color: var(--muted); padding: 12px 16px; border-top: 1px solid var(--hairline); }

.callout {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--primary);
  border-radius: var(--r-md);
  padding: 20px;
  margin: 24px 0;
}
.callout p:last-child { margin-bottom: 0; }

.related { border-top: 1px solid var(--hairline); margin-top: 48px; padding-top: 32px; }

.form {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: 32px;
}
.field { margin-bottom: 20px; }
.field label { display: block; font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 8px; }
.field input {
  width: 100%;
  height: 44px;
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-md);
  padding: 12px 16px;
  font-family: var(--font);
  font-size: 16px;
  color: var(--ink);
}
.field input:focus { outline: 2px solid var(--primary); outline-offset: 1px; border-color: var(--primary); }
.field input.invalid { border-color: var(--error); }
.field .err { color: var(--error); font-size: 13px; margin-top: 6px; display: none; }
.field .err.show { display: block; }
.form__note { font-size: 13px; color: var(--muted); margin-top: 4px; }
.form-status {
  display: none;
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--r-md);
  font-size: 14px;
}
.form-status.show { display: block; }
.form-status.ok { background: rgba(31,138,101,.1); color: var(--success); border: 1px solid rgba(31,138,101,.3); }

.spinner {
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: var(--on-primary);
  border-radius: 50%;
  display: inline-block;
  margin-right: 8px;
  animation: spin .7s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

.footer { background: var(--canvas); border-top: 1px solid var(--hairline); padding: 64px 0 48px; }
.footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; }
.footer h4 { font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); }
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin-bottom: 10px; }
.footer a { font-size: 14px; color: var(--body); }
.footer a:hover { color: var(--ink); }
.footer__brand p { font-size: 14px; color: var(--body); max-width: 36ch; }
.footer__bottom {
  border-top: 1px solid var(--hairline);
  margin-top: 48px;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
}
.disclaimer { font-size: 13px; color: var(--muted); max-width: 80ch; margin-top: 12px; }

.cookie {
  position: fixed;
  left: 24px;
  right: 24px;
  bottom: 24px;
  z-index: 150;
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-lg);
  padding: 20px 24px;
  display: none;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  max-width: 880px;
  margin: 0 auto;
}
.cookie.show { display: flex; }
.cookie p { margin: 0; font-size: 14px; color: var(--body); max-width: 56ch; }
.cookie__actions { display: flex; gap: 12px; }

@media (max-width: 1024px) {
  h1 { font-size: 56px; letter-spacing: -1.5px; }
  .hero__grid { grid-template-columns: 1fr; }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    padding: 8px 24px 16px;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; padding: 10px 0; border-bottom: 1px solid var(--hairline-soft); }
  .nav-toggle { display: inline-flex; }
}

@media (max-width: 640px) {
  h1 { font-size: 32px; letter-spacing: -1px; }
  h2 { font-size: 28px; letter-spacing: -0.5px; }
  .section { padding: 56px 0; }
  .grid--3, .grid--2 { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 40px; }
}