: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;
  --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;
  --sp-xxs: 4px;
  --sp-xs: 8px;
  --sp-sm: 12px;
  --sp-base: 16px;
  --sp-md: 20px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-xxl: 48px;
  --sp-section: 80px;
  --sans: "Inter", system-ui, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--body);
  background: var(--canvas);
  letter-spacing: 0;
}

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

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

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--sp-lg); }

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

h1, h2, h3, h4 {
  color: var(--ink);
  font-weight: 400;
  margin: 0 0 var(--sp-base);
}

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 var(--sp-base); }

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

.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 { display: inline-flex; align-items: center; gap: var(--sp-xs); color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: var(--r-sm);
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 600;
  font-size: 15px;
}
.brand-word { font-size: 18px; font-weight: 600; color: var(--ink); }

.nav-menu { display: flex; align-items: center; gap: var(--sp-lg); }
.nav-link {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink);
}
.nav-link:hover { color: var(--primary); text-decoration: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-md);
  cursor: pointer;
}
.nav-toggle span { width: 18px; 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;
  transition: background-color .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; }
.btn-secondary {
  background: var(--surface-card);
  color: var(--ink);
  border-color: var(--hairline-strong);
  padding: 10px 18px;
  height: 40px;
}
.btn-secondary:hover { background: var(--canvas-soft); text-decoration: none; }
.btn-ink { background: var(--ink); color: var(--canvas); padding: 12px 20px; height: 44px; }
.btn-ink:hover { background: #000; text-decoration: none; }
.btn-text { color: var(--ink); padding: 10px 4px; height: 40px; }
.btn-text:hover { color: var(--primary); text-decoration: none; }

.badge {
  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;
}

.hero { background: var(--canvas); padding: var(--sp-section) 0 var(--sp-xl); }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--sp-xxl);
  align-items: center;
}
.hero h1 { margin-top: var(--sp-base); }
.hero-lead { font-size: 18px; color: var(--body); max-width: 36ch; }
.hero-actions { display: flex; gap: var(--sp-base); flex-wrap: wrap; margin-top: var(--sp-lg); }
.hero-figure { border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--hairline); background: var(--surface-card); }
.hero-figure img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3; }
.caption { font-size: 13px; line-height: 1.4; color: var(--muted); padding: var(--sp-sm) var(--sp-base); margin: 0; }

.section { padding: var(--sp-section) 0; }
.section-tight { padding: var(--sp-xxl) 0; }
.section-head { max-width: 60ch; margin-bottom: var(--sp-xl); }
.section-head p { color: var(--body); font-size: 16px; }

.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-lg); }
.card-grid.two { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: var(--sp-lg);
}
.card h3 { font-size: 22px; letter-spacing: -0.11px; }
.card .label { margin-bottom: var(--sp-sm); display: block; }
.card p { color: var(--body); margin-bottom: var(--sp-sm); }
.card-link { font-size: 14px; font-weight: 500; color: var(--primary); }

.article-card { display: flex; flex-direction: column; overflow: hidden; padding: 0; }
.article-card .article-thumb { aspect-ratio: 16 / 9; object-fit: cover; width: 100%; }
.article-card .article-body { padding: var(--sp-lg); display: flex; flex-direction: column; gap: var(--sp-xs); }
.article-card h3 { font-size: 22px; margin: 0; }
.article-card .meta { font-size: 13px; color: var(--muted); }

.timeline { display: flex; flex-wrap: wrap; gap: var(--sp-xs); list-style: none; padding: 0; margin: 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); }

.band-soft { background: var(--canvas-soft); border-top: 1px solid var(--hairline-soft); border-bottom: 1px solid var(--hairline-soft); }

.steps { counter-reset: step; display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-lg); }
.step { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--r-lg); padding: var(--sp-lg); }
.step .num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: var(--r-pill);
  background: var(--surface-strong); color: var(--ink);
  font-size: 13px; font-weight: 600; margin-bottom: var(--sp-sm);
}
.step h4 { font-size: 18px; font-weight: 600; letter-spacing: 0; }
.step p { color: var(--body); margin: 0; }

.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: var(--sp-xxl); align-items: start; }
.article-main { max-width: 72ch; }
.article-head { margin-bottom: var(--sp-xl); }
.article-head h1 { font-size: 52px; letter-spacing: -1.2px; line-height: 1.12; }
.article-meta { font-size: 13px; color: var(--muted); display: flex; gap: var(--sp-base); flex-wrap: wrap; margin-bottom: var(--sp-base); }
.article-hero { border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--hairline); margin-bottom: var(--sp-xl); }
.article-hero img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.prose p { color: var(--body); line-height: 1.7; font-size: 16px; }
.prose h2 { font-size: 30px; letter-spacing: -0.5px; margin-top: var(--sp-xl); }
.prose h3 { font-size: 22px; letter-spacing: -0.11px; margin-top: var(--sp-lg); }
.prose ul, .prose ol { color: var(--body); line-height: 1.7; padding-left: 1.25rem; margin: 0 0 var(--sp-base); }
.prose li { margin-bottom: var(--sp-xs); }
.prose a { color: var(--primary); text-decoration: underline; }

.callout {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--primary);
  border-radius: var(--r-md);
  padding: var(--sp-base) var(--sp-md);
  margin: var(--sp-lg) 0;
}
.callout .label { display: block; margin-bottom: var(--sp-xs); }
.callout p:last-child { margin-bottom: 0; }

.keyfacts { list-style: none; padding: var(--sp-lg); margin: var(--sp-lg) 0; background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--r-lg); }
.keyfacts li { display: flex; gap: var(--sp-sm); padding: var(--sp-xs) 0; border-bottom: 1px solid var(--hairline-soft); color: var(--body); }
.keyfacts li:last-child { border-bottom: 0; }
.keyfacts strong { color: var(--ink); min-width: 7ch; }

.aside-card { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--r-lg); padding: var(--sp-lg); position: sticky; top: 88px; }
.aside-card h4 { font-size: 16px; font-weight: 600; letter-spacing: 0; }
.aside-card a { display: block; font-size: 14px; color: var(--ink); padding: 6px 0; border-bottom: 1px solid var(--hairline-soft); }
.aside-card a:last-child { border-bottom: 0; }
.aside-card a:hover { color: var(--primary); text-decoration: none; }

.page-main { padding: var(--sp-xxl) 0 var(--sp-section); }
.page-narrow { max-width: 76ch; }
.page-narrow h2 { font-size: 30px; letter-spacing: -0.5px; margin-top: var(--sp-xl); }
.page-narrow p, .page-narrow li { color: var(--body); line-height: 1.7; }
.page-narrow ul { padding-left: 1.25rem; }

.contact { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-xxl); align-items: start; }
.form-card { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--r-lg); padding: var(--sp-xl); }
.field { margin-bottom: var(--sp-base); }
.field label { display: block; font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
.field input {
  width: 100%;
  height: 44px;
  padding: 12px 16px;
  font-family: var(--sans);
  font-size: 16px;
  color: var(--ink);
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-md);
}
.field input:focus { outline: 2px solid var(--primary); outline-offset: 1px; border-color: var(--primary); }
.field input:invalid:not(:placeholder-shown) { border-color: var(--error); }
.form-note { font-size: 13px; color: var(--muted); }
.form-status { margin-top: var(--sp-base); font-size: 14px; }
.form-status.success { color: var(--success); }
.btn[disabled] { opacity: .6; cursor: progress; }

.cookie-banner {
  position: fixed;
  left: var(--sp-base);
  right: var(--sp-base);
  bottom: var(--sp-base);
  z-index: 150;
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-lg);
  padding: var(--sp-base) var(--sp-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-base);
  max-width: 1100px;
  margin: 0 auto;
}
.cookie-text p { margin: 0; font-size: 14px; color: var(--body); }
.cookie-text a { color: var(--primary); text-decoration: underline; }
.cookie-actions { display: flex; gap: var(--sp-xs); flex-shrink: 0; }
.cookie-banner.hidden { display: none; }

.footer { background: var(--canvas); border-top: 1px solid var(--hairline); padding: var(--sp-section) 0 var(--sp-xl); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr 1.2fr; gap: var(--sp-xl); }
.footer-brand { margin-bottom: var(--sp-sm); }
.footer-text { font-size: 14px; color: var(--body); }
.footer-head { font-size: 11px; font-weight: 600; letter-spacing: 0.88px; text-transform: uppercase; color: var(--muted); margin: 0 0 var(--sp-sm); }
.footer-link { display: block; font-size: 14px; color: var(--body); padding: 4px 0; }
.footer-link:hover { color: var(--primary); text-decoration: none; }
.footer-link.inline { display: inline; padding: 0; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-xs);
  margin-top: var(--sp-xl);
  padding-top: var(--sp-base);
  border-top: 1px solid var(--hairline);
  font-size: 13px;
  color: var(--muted);
}
.footer-bottom p { margin: 0; }

@media (max-width: 1024px) {
  h1 { font-size: 56px; letter-spacing: -1.6px; }
  .hero-grid { grid-template-columns: 1fr; gap: var(--sp-xl); }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .aside-card { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
  .footer-about { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    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: var(--sp-xs) var(--sp-lg) var(--sp-base);
    display: none;
  }
  .nav-menu.open { display: flex; }
  .nav-link { padding: var(--sp-sm) 0; width: 100%; border-bottom: 1px solid var(--hairline-soft); }
}

@media (max-width: 640px) {
  h1 { font-size: 32px; letter-spacing: -0.8px; }
  h2 { font-size: 28px; letter-spacing: -0.4px; }
  .article-head h1 { font-size: 32px; letter-spacing: -0.6px; }
  .section { padding: var(--sp-xxl) 0; }
  .hero { padding: var(--sp-xl) 0; }
  .card-grid, .card-grid.two, .steps { grid-template-columns: 1fr; }
  .contact { grid-template-columns: 1fr; gap: var(--sp-xl); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cookie-banner { flex-direction: column; align-items: stretch; }
  .cookie-actions { justify-content: flex-end; }
}