:root {
  --canvas: #f7f7f4;
  --canvas-soft: #fafaf7;
  --surface-card: #ffffff;
  --surface-strong: #e6e5e0;
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;
  --primary: #f54e00;
  --primary-active: #d04200;
  --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;
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;
  --r-pill: 9999px;
  --sans: "Inter", system-ui, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  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 { color: var(--ink); font-weight: 400; }

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

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

.display-mega { font-size: 72px; line-height: 1.1; letter-spacing: -2.16px; font-weight: 400; }
.display-lg { font-size: 36px; line-height: 1.2; letter-spacing: -0.72px; }
.display-md { font-size: 26px; line-height: 1.25; letter-spacing: -0.325px; }
.display-sm { font-size: 22px; line-height: 1.3; letter-spacing: -0.11px; }

.label-uppercase {
  font-size: 11px; font-weight: 600; line-height: 1.4; letter-spacing: 0.88px;
  text-transform: uppercase; color: var(--muted);
}

.body-tracked { letter-spacing: 0.08px; }
.lead { font-size: 18px; color: var(--body); }

section { padding: 80px 0; }

.top-nav {
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  position: sticky; top: 0; z-index: 50;
}
.nav-inner { height: 64px; display: flex; align-items: center; justify-content: space-between; }
.wordmark { font-size: 18px; font-weight: 600; color: var(--ink); letter-spacing: -0.2px; }
.wordmark-dot { color: var(--primary); }
.nav-menu { display: flex; align-items: center; gap: 24px; }
.nav-link { font-size: 14px; font-weight: 500; color: var(--ink); }
.nav-link-strong {
  background: var(--primary); color: var(--on-primary);
  padding: 8px 14px; border-radius: var(--r-md); font-weight: 500;
}
.nav-link-strong:hover { background: var(--primary-active); text-decoration: none; }
.nav-toggle { display: none; flex-direction: column; gap: 4px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); display: block; }

.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: var(--r-md); cursor: pointer; border: 1px solid transparent;
  padding: 10px 18px; height: 40px;
}
.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: 1px solid var(--hairline-strong); }
.btn-secondary:hover { text-decoration: none; border-color: var(--ink); }
.btn-ink { background: var(--ink); color: var(--canvas); height: 44px; padding: 12px 20px; }
.btn-ink:hover { text-decoration: none; opacity: 0.92; }
.btn-text { background: none; color: var(--ink); height: 40px; padding: 10px 6px; }

.hero-band { background: var(--canvas); padding-top: 80px; padding-bottom: 64px; }
.hero-inner { max-width: 760px; }
.hero-band h1 { margin: 16px 0 20px; }
.hero-sub { font-size: 18px; color: var(--body); max-width: 620px; }
.hero-actions { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }

.hero-figure { margin-top: 48px; }
.figure-card {
  background: var(--surface-card); border: 1px solid var(--hairline);
  border-radius: var(--r-lg); overflow: hidden;
}
.figure-card img { width: 100%; height: auto; object-fit: cover; aspect-ratio: 16 / 9; }
.figure-caption { font-size: 13px; line-height: 1.4; color: var(--muted); padding: 12px 16px; border-top: 1px solid var(--hairline-soft); }

.section-head { max-width: 640px; margin-bottom: 40px; }
.section-head .display-lg { margin: 12px 0 12px; }

.method-grid { display: grid; grid-template-columns: repeat(3, 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; margin-bottom: 8px; }
.feature-card p { font-size: 16px; color: var(--body); }
.feature-index { font-family: var(--mono); font-size: 13px; color: var(--muted); margin-bottom: 16px; }

.article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.article-card {
  background: var(--surface-card); border: 1px solid var(--hairline);
  border-radius: var(--r-lg); overflow: hidden; display: flex; flex-direction: column;
}
.article-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.article-card-body { padding: 24px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.article-card h3 { font-size: 22px; line-height: 1.3; letter-spacing: -0.11px; }
.article-card p { font-size: 16px; color: var(--body); }
.article-card .btn-text { margin-top: auto; align-self: flex-start; color: var(--primary); }

.timeline-pills { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0; }
.pill {
  font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase;
  color: var(--ink); border-radius: var(--r-pill); padding: 4px 10px;
}
.pill-thinking { background: var(--t-thinking); }
.pill-grep { background: var(--t-grep); }
.pill-read { background: var(--t-read); }
.pill-edit { background: var(--t-edit); }
.pill-done { background: var(--t-done); color: var(--on-primary); }

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

.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 48px; align-items: start; }
.article-main { max-width: 720px; }
.article-main h1 { margin: 16px 0 16px; }
.article-meta { font-size: 13px; color: var(--muted); margin-bottom: 24px; }
.article-main h2 { font-size: 26px; line-height: 1.25; letter-spacing: -0.325px; margin: 40px 0 16px; }
.article-main h3 { font-size: 22px; line-height: 1.3; letter-spacing: -0.11px; margin: 28px 0 12px; }
.article-main p { margin-bottom: 16px; letter-spacing: 0.08px; }
.article-main ul, .article-main ol { margin: 0 0 16px 22px; }
.article-main li { margin-bottom: 8px; }
.article-figure { margin: 28px 0; }

.callout {
  background: var(--canvas-soft); border: 1px solid var(--hairline);
  border-left: 3px solid var(--primary); border-radius: var(--r-md);
  padding: 20px; margin: 28px 0;
}
.callout .label-uppercase { margin-bottom: 8px; }

.code-block {
  background: var(--surface-card); border: 1px solid var(--hairline);
  border-radius: var(--r-lg); padding: 20px; margin: 24px 0;
  font-family: var(--mono); font-size: 13px; line-height: 1.5; color: var(--ink);
  white-space: pre-wrap;
}

.spec-table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 15px; }
.spec-table th, .spec-table td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--hairline); }
.spec-table th { color: var(--ink); font-weight: 600; background: var(--canvas-soft); }
.spec-table td { color: var(--body); }

.aside-card {
  background: var(--surface-card); border: 1px solid var(--hairline);
  border-radius: var(--r-lg); padding: 24px; position: sticky; top: 88px;
}
.aside-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 12px; }
.aside-card a { display: block; font-size: 14px; color: var(--body); margin-bottom: 8px; }

.contact-band { background: var(--canvas-soft); border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-form { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--r-lg); padding: 32px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; color: var(--ink); margin-bottom: 6px; }
.text-input {
  width: 100%; background: var(--surface-card); color: var(--ink);
  border: 1px solid var(--hairline-strong); border-radius: var(--r-md);
  padding: 12px 16px; height: 44px; font-family: var(--sans); font-size: 15px;
}
textarea.text-input { height: auto; min-height: 110px; padding-top: 12px; resize: vertical; }
.text-input:focus { outline: none; border-color: var(--primary); }
.form-status { margin-top: 14px; font-size: 14px; min-height: 20px; }
.form-status.success { color: var(--success); }

.contact-list { list-style: none; margin: 16px 0 0; font-size: 15px; color: var(--body); }
.contact-list li { margin-bottom: 10px; }
.contact-list strong { color: var(--ink); }

.footer { background: var(--canvas); border-top: 1px solid var(--hairline); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.footer-head { font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 14px; }
.footer-link { display: block; font-size: 14px; color: var(--body); margin-bottom: 10px; }
.footer-note { font-size: 14px; color: var(--body); margin: 12px 0; max-width: 320px; }
.footer-meta { font-size: 13px; color: var(--muted); }
.footer-bottom { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--hairline); }
.footer-disclaimer { font-size: 13px; color: var(--muted); }

.cookie-banner {
  position: fixed; left: 24px; right: 24px; bottom: 24px; z-index: 100;
  max-width: 880px; margin: 0 auto;
  background: var(--surface-card); border: 1px solid var(--hairline-strong);
  border-radius: var(--r-lg); padding: 20px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.cookie-banner.hidden { display: none; }
.cookie-text { font-size: 14px; color: var(--body); }
.cookie-actions { display: flex; gap: 12px; flex-shrink: 0; }

@media (max-width: 1024px) {
  .display-mega { font-size: 56px; letter-spacing: -1.4px; }
  .method-grid, .article-grid { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .aside-card { position: static; }
  .footer-grid { grid-template-columns: 1fr 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; }
}

@media (max-width: 640px) {
  .display-mega { font-size: 32px; letter-spacing: -0.6px; }
  .display-lg { font-size: 28px; }
  section { padding: 56px 0; }
  .method-grid, .article-grid, .contact-grid, .footer-grid { grid-template-columns: 1fr; }
  .cookie-banner { flex-direction: column; align-items: flex-start; left: 12px; right: 12px; bottom: 12px; }
}