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

:root {
  --canvas: #f7f7f4;
  --canvas-soft: #fafaf7;
  --surface-card: #ffffff;
  --surface-strong: #e6e5e0;
  --primary: #f54e00;
  --primary-active: #d04200;
  --ink: #26251e;
  --body: #5a5852;
  --body-strong: #26251e;
  --muted: #807d72;
  --muted-soft: #a09c92;
  --on-primary: #ffffff;
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;
  --success: #1f8a65;
  --error: #cf2d56;
  --timeline-thinking: #dfa88f;
  --timeline-grep: #9fc9a2;
  --timeline-read: #9fbbe0;
  --timeline-edit: #c0a8dd;
  --timeline-done: #c08532;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background-color: var(--canvas);
  color: var(--body);
  line-height: 1.5;
  font-size: 16px;
  font-weight: 400;
}

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

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

h1, h2, h3, h4, h5, h6 {
  color: var(--ink);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

h1 { font-size: clamp(32px, 5vw, 48px); letter-spacing: -1px; }
h2 { font-size: clamp(24px, 3vw, 36px); letter-spacing: -0.72px; }
h3 { font-size: clamp(20px, 2.5vw, 26px); letter-spacing: -0.325px; }
h4 { font-size: 22px; letter-spacing: -0.11px; }
h5 { font-size: 18px; font-weight: 600; letter-spacing: 0; }
h6 { font-size: 16px; font-weight: 600; letter-spacing: 0; }

p { margin-bottom: 1rem; color: var(--body); }

code, pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 20px;
  color: var(--ink);
  overflow-x: auto;
  line-height: 1.5;
}

code { padding: 2px 6px; border-radius: 4px; }

.top-nav {
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  height: 64px;
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.top-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-wordmark {
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.5px;
}

.nav-wordmark span { color: var(--primary); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-menu a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.4;
}

.nav-menu a:hover { color: var(--primary); text-decoration: none; }

.nav-cta {
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  height: 40px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  line-height: 1;
  transition: background 0.15s;
}

.btn-primary:hover { background: var(--primary-active); text-decoration: none; color: var(--on-primary); }

.btn-secondary {
  background: var(--surface-card);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--hairline-strong);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  line-height: 1;
  transition: border-color 0.15s;
}

.btn-secondary:hover { border-color: var(--ink); text-decoration: none; color: var(--ink); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: 0.2s;
}

.layout-with-sidebar {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 80px;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 24px;
}

.sidebar-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

.sidebar-nav { list-style: none; }

.sidebar-nav li { margin-bottom: 4px; }

.sidebar-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--body);
  padding: 6px 8px;
  border-radius: 6px;
  display: block;
  transition: 0.15s;
}

.sidebar-nav a:hover, .sidebar-nav a.active {
  color: var(--ink);
  background: var(--surface-strong);
  text-decoration: none;
}

.sidebar-nav a.active { color: var(--primary); background: rgba(245,78,0,0.06); }

.main-content { min-width: 0; }

.page-header {
  padding: 80px 0 48px;
  border-bottom: 1px solid var(--hairline-soft);
  margin-bottom: 48px;
}

.page-header .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;
  margin-bottom: 16px;
}

.page-header h1 { margin-bottom: 16px; }

.page-header .lead {
  font-size: 18px;
  color: var(--body);
  line-height: 1.6;
  max-width: 680px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb .sep { color: var(--hairline-strong); }
.breadcrumb .current { color: var(--ink); }

.toc {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 40px;
}

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

.toc ol { padding-left: 20px; }
.toc li { margin-bottom: 6px; }
.toc a { font-size: 14px; color: var(--body); }
.toc a:hover { color: var(--primary); }

.article-body { line-height: 1.7; }
.article-body h2 { margin: 40px 0 16px; }
.article-body h3 { margin: 32px 0 12px; }
.article-body p { margin-bottom: 20px; }

.article-body ul, .article-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-body li { margin-bottom: 8px; }

.timeline-container { margin: 40px 0; }

.timeline-item {
  display: flex;
  gap: 20px;
  margin-bottom: 32px;
  align-items: flex-start;
}

.timeline-marker {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  margin-top: 4px;
  background: var(--surface-strong);
  color: var(--ink);
  border: 1px solid var(--hairline);
}

.timeline-item:nth-child(1) .timeline-marker { background: var(--timeline-thinking); }
.timeline-item:nth-child(2) .timeline-marker { background: var(--timeline-grep); }
.timeline-item:nth-child(3) .timeline-marker { background: var(--timeline-read); }
.timeline-item:nth-child(4) .timeline-marker { background: var(--timeline-edit); }
.timeline-item:nth-child(5) .timeline-marker { background: var(--timeline-done); color: #fff; }

.timeline-content h4 { margin-bottom: 8px; font-size: 18px; font-weight: 600; }
.timeline-content p { margin-bottom: 0; }

.feature-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 24px;
}

.feature-card h5 { margin-bottom: 8px; font-size: 18px; font-weight: 600; color: var(--ink); }

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 32px 0;
}

.related-section {
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--hairline);
}

.related-section h3 {
  font-size: 22px;
  margin-bottom: 24px;
  font-weight: 400;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.related-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 20px;
  transition: border-color 0.15s;
}

.related-card:hover { border-color: var(--hairline-strong); }

.related-card .label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

.related-card h6 { font-size: 15px; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
.related-card p { font-size: 13px; margin-bottom: 0; }

.faq-item {
  border-bottom: 1px solid var(--hairline-soft);
}

.faq-item summary {
  padding: 16px 0;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: '+';
  font-size: 20px;
  font-weight: 400;
  color: var(--muted);
  flex-shrink: 0;
}

.faq-item[open] summary::after { content: '−'; }

.faq-body { padding: 0 0 16px; color: var(--body); font-size: 15px; line-height: 1.6; }

.disclaimer-block {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--surface-strong);
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
}

.footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 64px 0 48px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .wordmark {
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}

.footer-brand .wordmark span { color: var(--primary); }

.footer-brand p { font-size: 14px; line-height: 1.5; max-width: 340px; }

.footer-col h6 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { font-size: 14px; color: var(--body); }
.footer-col a:hover { color: var(--ink); text-decoration: none; }

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-disclaimers { max-width: 640px; }

.footer-disclaimers p {
  font-size: 13px;
  color: var(--muted-soft);
  margin-bottom: 8px;
  line-height: 1.5;
}

.footer-copy { font-size: 13px; color: var(--muted); flex-shrink: 0; }

.hero-section {
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--hairline-soft);
}

.hero-section h1 { margin-bottom: 20px; max-width: 720px; }
.hero-section .lead { font-size: 18px; color: var(--body); line-height: 1.6; max-width: 600px; margin-bottom: 32px; }

.hero-pills { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 48px; }

.timeline-pill {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  border-radius: 9999px;
  padding: 4px 10px;
  color: var(--ink);
}

.pill-thinking { background: var(--timeline-thinking); }
.pill-grep { background: var(--timeline-grep); }
.pill-read { background: var(--timeline-read); }
.pill-edit { background: var(--timeline-edit); }
.pill-done { background: var(--timeline-done); color: #fff; }

.guide-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  padding: 64px 0;
}

.guide-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 28px;
  transition: border-color 0.15s;
}

.guide-card:hover { border-color: var(--hairline-strong); }

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

.guide-card h3 { font-size: 22px; margin-bottom: 10px; }
.guide-card p { font-size: 15px; margin-bottom: 16px; }
.guide-card a.read-link { font-size: 14px; font-weight: 500; color: var(--primary); }
.guide-card a.read-link:hover { text-decoration: underline; }

.contact-form { max-width: 600px; }

.form-group { margin-bottom: 20px; }

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.form-group input, .form-group textarea {
  width: 100%;
  background: var(--surface-card);
  color: var(--ink);
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  padding: 12px 16px;
  height: 44px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.15s;
}

.form-group textarea { height: 120px; resize: vertical; }

.form-group input:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--ink);
}

.form-group input.error, .form-group textarea.error { border-color: var(--error); }

.form-error { font-size: 13px; color: var(--error); margin-top: 4px; display: none; }
.form-error.visible { display: block; }

.form-success {
  background: rgba(31,138,101,0.08);
  border: 1px solid var(--success);
  color: var(--success);
  border-radius: 8px;
  padding: 16px;
  font-size: 15px;
  display: none;
}

.form-success.visible { display: block; }

#cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--ink);
  color: var(--canvas);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  z-index: 9999;
  border-top: 1px solid rgba(255,255,255,0.1);
}

#cookie-banner p { font-size: 14px; color: var(--canvas); margin: 0; }

#cookie-banner a { color: #dfa88f; }

.cookie-actions { display: flex; gap: 12px; flex-shrink: 0; }

.cookie-accept {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
}

.cookie-reject {
  background: transparent;
  color: var(--canvas);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 8px;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
}

.section { padding: 80px 0; }

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

.divider { height: 1px; background: var(--hairline-soft); margin: 48px 0; }

@media (max-width: 1024px) {
  .layout-with-sidebar { grid-template-columns: 220px 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .nav-menu, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    padding: 16px 24px;
    gap: 4px;
    z-index: 99;
  }
  .nav-cta.open { display: flex; padding: 0 24px 16px; background: var(--canvas); position: absolute; top: auto; left: 0; right: 0; z-index: 99; }
  .layout-with-sidebar { grid-template-columns: 1fr; padding: 24px; }
  .sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; }
  .guide-cards { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-section { padding: 48px 0 40px; }
  h1 { font-size: 28px; }
  .page-header { padding: 40px 0 32px; }
  #cookie-banner { flex-direction: column; align-items: flex-start; }
}