:root {
  --canvas: #f7f7f4;
  --canvas-soft: #fafaf7;
  --primary: #f54e00;
  --primary-active: #d04200;
  --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;
  --section: 80px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

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

code, pre, .mono {
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 13px;
}

img { max-width: 100%; display: block; }
a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--primary); }

h1, h2, h3, h4 {
  color: var(--ink);
  font-weight: 400;
  line-height: 1.2;
}

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

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

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.015em;
}

.site-logo span { color: var(--primary); }

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--body);
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); }

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  margin: 4px 0;
}

.mobile-menu {
  display: none;
  background: var(--surface-card);
  border-bottom: 1px solid var(--hairline);
  padding: 16px 24px;
  flex-direction: column;
  gap: 16px;
}

.mobile-menu a {
  font-size: 14px;
  font-weight: 500;
  color: var(--body);
}

.mobile-menu.open { display: flex; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  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;
  text-decoration: none;
}

.btn-primary:hover {
  background: var(--primary-active);
  color: var(--on-primary);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  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;
  text-decoration: none;
}

.btn-secondary:hover { color: var(--ink); border-color: var(--ink); }

.section-pad { padding: var(--section) 0; }

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

.section-title {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.72px;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-body {
  font-size: 16px;
  color: var(--body);
  max-width: 640px;
  line-height: 1.6;
}

.guide-card {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 24px;
  transition: border-color 0.15s;
}

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

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

.guide-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  line-height: 1.3;
}

.guide-card-desc {
  font-size: 14px;
  color: var(--body);
  line-height: 1.6;
  margin-bottom: 20px;
}

.guide-card-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.page-layout {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 64px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
  align-items: start;
}

.page-content h1 {
  font-size: clamp(26px, 4vw, 48px);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.72px;
  margin-bottom: 24px;
  line-height: 1.15;
}

.page-content h2 {
  font-size: 26px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.325px;
  margin: 48px 0 16px;
  padding-top: 16px;
  border-top: 1px solid var(--hairline);
}

.page-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin: 32px 0 12px;
}

.page-content p {
  color: var(--body);
  line-height: 1.7;
  margin-bottom: 16px;
  font-size: 16px;
}

.page-content ul, .page-content ol {
  color: var(--body);
  line-height: 1.7;
  margin: 0 0 16px 24px;
  font-size: 16px;
}

.page-content li { margin-bottom: 8px; }

.code-block {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 20px;
  margin: 24px 0;
  overflow-x: auto;
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 13px;
  color: var(--ink);
  line-height: 1.6;
  white-space: pre;
}

.disclaimer-box {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--primary);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.toc-sidebar {
  position: sticky;
  top: 80px;
  align-self: start;
}

.toc-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--hairline);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc-list a {
  font-size: 13px;
  color: var(--body);
  display: block;
  padding: 6px 0;
  border-bottom: 1px solid var(--hairline-soft);
  transition: color 0.15s;
}

.toc-list a:hover { color: var(--ink); }

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

.related-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 24px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

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

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

.related-card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}

.related-card-title a { color: inherit; }
.related-card-title a:hover { color: var(--primary); }

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--body); }
.breadcrumb .sep { color: var(--muted-soft); }
.breadcrumb .current { color: var(--body); }

.page-header {
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  padding: 64px 24px 48px;
}

.page-header-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.page-header h1 {
  font-size: clamp(26px, 4vw, 48px);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.72px;
  margin-bottom: 16px;
}

.page-header-desc {
  font-size: 16px;
  color: var(--body);
  max-width: 640px;
  line-height: 1.6;
}

.comparison-table-wrap {
  overflow-x: auto;
  margin: 32px 0;
  border-radius: 12px;
  border: 1px solid var(--hairline);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface-card);
  font-size: 14px;
}

.comparison-table th {
  background: var(--canvas-soft);
  color: var(--ink);
  font-weight: 600;
  font-size: 13px;
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--hairline);
  white-space: nowrap;
}

.comparison-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--hairline-soft);
  color: var(--body);
  vertical-align: top;
  line-height: 1.5;
}

.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table tr:hover td { background: var(--canvas-soft); }

.comparison-table .col-feature {
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.table-note {
  font-size: 13px;
  color: var(--muted);
  margin-top: 12px;
  line-height: 1.5;
}

.faq-list { margin-top: 24px; }

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

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

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

.faq-body {
  padding: 0 0 20px;
  color: var(--body);
  line-height: 1.7;
  font-size: 16px;
}

.site-footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: 48px 24px 40px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--body);
  line-height: 1.6;
  margin-top: 12px;
  max-width: 300px;
}

.footer-col-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col ul a {
  font-size: 14px;
  color: var(--body);
}

.footer-col ul a:hover { color: var(--ink); }

.footer-bottom {
  border-top: 1px solid var(--hairline);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-copyright {
  font-size: 13px;
  color: var(--muted);
}

.footer-disclaimer {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface-card);
  border-top: 1px solid var(--hairline);
  padding: 16px 24px;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.cookie-text {
  font-size: 14px;
  color: var(--body);
  line-height: 1.5;
  flex: 1;
  min-width: 200px;
}

.cookie-text a { color: var(--ink); text-decoration: underline; }

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

.btn-cookie-accept {
  background: var(--primary);
  color: var(--on-primary);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 16px;
  border: none;
  cursor: pointer;
  border-radius: 8px;
}

.btn-cookie-reject {
  background: transparent;
  color: var(--body);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 16px;
  border: 1px solid var(--hairline-strong);
  cursor: pointer;
  border-radius: 8px;
}

.contact-form { max-width: 560px; }

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

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.form-input {
  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: 16px;
  font-family: inherit;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
}

.form-input::placeholder { color: var(--muted-soft); }

.form-success {
  font-size: 14px;
  color: #1f8a65;
  padding: 14px 16px;
  background: rgba(31,138,101,0.08);
  border: 1px solid rgba(31,138,101,0.25);
  border-radius: 8px;
  display: none;
  margin-top: 16px;
}

.form-loading {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-right: 8px;
  vertical-align: middle;
}

@keyframes spin { to { transform: rotate(360deg); } }

.page-simple {
  max-width: 800px;
  margin: 0 auto;
  padding: 64px 24px;
}

.page-simple h1 {
  font-size: clamp(26px, 4vw, 48px);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.72px;
  margin-bottom: 32px;
}

.page-simple h2 {
  font-size: 22px;
  font-weight: 400;
  color: var(--ink);
  margin: 40px 0 12px;
  padding-top: 16px;
  border-top: 1px solid var(--hairline);
}

.page-simple h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin: 24px 0 8px;
}

.page-simple p {
  color: var(--body);
  line-height: 1.7;
  margin-bottom: 14px;
  font-size: 16px;
}

.page-simple ul, .page-simple ol {
  color: var(--body);
  line-height: 1.7;
  margin: 0 0 14px 24px;
  font-size: 16px;
}

.page-simple li { margin-bottom: 6px; }

.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;
  padding: 4px 10px;
  border-radius: 9999px;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

@media (max-width: 1024px) {
  .page-layout { grid-template-columns: 1fr; }
  .toc-sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .related-grid { grid-template-columns: 1fr 1fr; }
  .two-col { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: block; }
  .guide-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
  .cookie-banner { flex-direction: column; align-items: flex-start; }
}