@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --primary: #f54e00;
  --primary-active: #d04200;
  --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;
  --on-primary: #ffffff;
  --tl-thinking: #dfa88f;
  --tl-grep: #9fc9a2;
  --tl-read: #9fbbe0;
  --tl-edit: #c0a8dd;
  --tl-done: #c08532;
  --success: #1f8a65;
  --error: #cf2d56;
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;
  --r-pill: 9999px;
  --container: 1200px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', system-ui, "Helvetica Neue", Helvetica, Arial, sans-serif;
  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: var(--container); 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: -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; }
h4 { font-size: 22px; line-height: 1.3; letter-spacing: -0.005em; }
p { margin: 0 0 16px; }
a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--primary); }

.skip-link { position: absolute; left: -9999px; top: 0; background: var(--ink); color: var(--canvas); padding: 8px 16px; z-index: 200; }
.skip-link:focus { left: 0; }

.top-nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand-mark { font-size: 20px; color: var(--ink); letter-spacing: -0.03em; }
.brand-mark::before { content: "›"; color: var(--primary); margin-right: 6px; }
.nav-menu { display: flex; align-items: center; gap: 24px; }
.nav-link { font-size: 14px; font-weight: 500; color: var(--body); }
.nav-link:hover { color: var(--ink); }
.nav-cta {
  background: var(--primary); color: var(--on-primary);
  padding: 10px 18px; border-radius: var(--r-md); height: 40px;
  display: inline-flex; align-items: center; line-height: 1;
}
.nav-cta:hover { background: var(--primary-active); color: var(--on-primary); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); display: block; }

.section { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.label-uppercase {
  display: inline-block; font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--muted); margin-bottom: 16px;
}

.hero { background: var(--canvas); padding: 80px 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: 46ch; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 24px; }

.btn { display: inline-flex; align-items: center; justify-content: center; cursor: pointer; border: 0; font-family: inherit; }
.btn-primary {
  background: var(--primary); color: var(--on-primary); font-size: 14px; font-weight: 500;
  padding: 10px 18px; height: 40px; border-radius: var(--r-md);
}
.btn-primary:hover { background: var(--primary-active); color: var(--on-primary); }
.btn-download {
  background: var(--ink); color: var(--canvas); font-size: 14px; font-weight: 500;
  padding: 12px 20px; height: 44px; border-radius: var(--r-md);
}
.btn-download:hover { color: var(--canvas); opacity: 0.9; }
.btn-secondary {
  background: var(--surface-card); color: var(--ink); border: 1px solid var(--hairline-strong);
  font-size: 14px; font-weight: 500; padding: 10px 18px; height: 40px; border-radius: var(--r-md);
}
.btn-text { color: var(--ink); font-weight: 500; font-size: 14px; align-self: center; }
.btn-text::after { content: " →"; }

.media-card {
  background: var(--surface-card); border: 1px solid var(--hairline);
  border-radius: var(--r-lg); overflow: hidden;
}
.media-card img { width: 100%; height: 100%; display: block; object-fit: cover; aspect-ratio: 4 / 3; }
.media-card figcaption { font-size: 13px; color: var(--muted); padding: 12px 16px; line-height: 1.4; }

.badge-pill {
  display: inline-block; background: var(--surface-strong); color: var(--ink);
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em;
  border-radius: var(--r-pill); padding: 4px 10px;
}

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

.feature-card {
  background: var(--surface-card); border: 1px solid var(--hairline);
  border-radius: var(--r-lg); padding: 24px;
}
.feature-card h3 { font-size: 18px; font-weight: 600; }
.feature-card p { margin-bottom: 0; }
.card-link { display: block; }
.card-link:hover { border-color: var(--hairline-strong); }
.card-meta { font-size: 13px; color: var(--muted); margin-bottom: 8px; }

.timeline { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0; }
.tl-pill {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--ink); border-radius: var(--r-pill); padding: 4px 10px;
}
.tl-thinking { background: var(--tl-thinking); }
.tl-grep { background: var(--tl-grep); }
.tl-read { background: var(--tl-read); }
.tl-edit { background: var(--tl-edit); }
.tl-done { background: var(--tl-done); color: var(--on-primary); }

.code-block {
  background: var(--surface-card); border: 1px solid var(--hairline);
  border-radius: var(--r-lg); padding: 20px; font-family: 'JetBrains Mono', monospace;
  font-size: 13px; line-height: 1.5; color: var(--ink); overflow-x: auto; margin: 0 0 16px;
}

.callout {
  background: var(--canvas-soft); border: 1px solid var(--hairline);
  border-left: 3px solid var(--primary); border-radius: var(--r-md);
  padding: 20px 24px; margin: 24px 0;
}
.callout h4 { margin-bottom: 8px; }
.callout p:last-child { margin-bottom: 0; }

.data-table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 15px; }
.data-table th, .data-table td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--hairline); }
.data-table th { color: var(--ink); font-weight: 600; background: var(--canvas-soft); }
.data-table caption { caption-side: bottom; font-size: 13px; color: var(--muted); padding-top: 8px; text-align: left; }

.article-wrap { max-width: 760px; margin: 0 auto; }
.article-hero img { width: 100%; border-radius: var(--r-lg); border: 1px solid var(--hairline); display: block; }
.article-body { font-size: 16px; letter-spacing: 0.005em; }
.article-body h2 { margin-top: 48px; }
.article-body h3 { margin-top: 32px; }
.article-body ul, .article-body ol { padding-left: 22px; margin: 0 0 16px; }
.article-body li { margin-bottom: 8px; }
.article-meta { font-size: 13px; color: var(--muted); margin-bottom: 24px; }
.toc { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--r-lg); padding: 20px 24px; margin-bottom: 32px; }
.toc h4 { font-size: 16px; font-weight: 600; margin-bottom: 12px; }
.toc a { display: block; color: var(--body); font-size: 15px; padding: 4px 0; }
.toc a:hover { color: var(--primary); }

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

.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 48px; align-items: start; }
.form-field { margin-bottom: 16px; }
.form-field label { display: block; font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
.form-field input, .form-field textarea {
  width: 100%; background: var(--surface-card); color: var(--ink);
  border: 1px solid var(--hairline-strong); border-radius: var(--r-md);
  padding: 12px 16px; font-family: inherit; font-size: 16px;
}
.form-field input { height: 44px; }
.form-field input:focus, .form-field textarea:focus { outline: none; border-color: var(--primary); }
.form-msg { border-radius: var(--r-md); padding: 12px 16px; margin-bottom: 16px; font-size: 15px; display: none; }
.form-msg.success { display: block; background: rgba(31,138,101,0.1); color: var(--success); border: 1px solid var(--success); }
.btn-primary[disabled] { opacity: 0.6; cursor: progress; }

.footer { background: var(--canvas); border-top: 1px solid var(--hairline); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr; gap: 32px; }
.footer-head { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin-bottom: 16px; }
.footer-link { display: block; font-size: 14px; color: var(--body); margin-bottom: 8px; }
.footer-note { font-size: 14px; color: var(--body); max-width: 36ch; margin-top: 12px; }
.footer-bottom { border-top: 1px solid var(--hairline); margin-top: 32px; padding-top: 24px; }
.footer-bottom p { font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.disclaimer { color: var(--muted-soft); }

.cookie-banner {
  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: 1200px; margin: 0 auto;
}
.cookie-banner.show { display: flex; }
.cookie-banner p { margin: 0; font-size: 14px; color: var(--body); max-width: 64ch; }
.cookie-actions { display: flex; gap: 12px; flex-shrink: 0; }

@media (max-width: 1024px) {
  h1 { font-size: 56px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 4px;
    background: var(--canvas); border-bottom: 1px solid var(--hairline); padding: 16px 24px;
  }
  .nav-menu.open { display: flex; }
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 640px) {
  h1 { font-size: 32px; }
  h2 { font-size: 28px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section { padding: 56px 0; }
}