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

:root {
  --color-primary: #0a0a0a;
  --color-on-primary: #ffffff;
  --color-brand-green: #00d4a4;
  --color-brand-green-deep: #00b48a;
  --color-brand-green-soft: #7cebcb;
  --color-canvas: #ffffff;
  --color-surface: #f7f7f7;
  --color-surface-soft: #fafafa;
  --color-surface-code: #1c1c1e;
  --color-hairline: #e5e5e5;
  --color-hairline-soft: #ededed;
  --color-hairline-dark: #1f1f1f;
  --color-ink: #0a0a0a;
  --color-charcoal: #1c1c1e;
  --color-slate: #3a3a3c;
  --color-steel: #5a5a5c;
  --color-stone: #888888;
  --color-muted: #a8a8aa;
  --color-on-dark: #ffffff;
  --color-on-dark-muted: #b3b3b3;
  --sidebar-width: 240px;
  --toc-width: 200px;
  --content-max: 720px;
  --nav-height: 64px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-ink);
  background: var(--color-canvas);
}

a { color: inherit; }

.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-canvas);
  border-bottom: 1px solid var(--color-hairline-soft);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-xxl, 32px);
}

.top-nav-inner {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  text-decoration: none;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-brand-green);
  display: inline-block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  font-size: 14px;
  color: var(--color-steel);
  transition: color 0.15s;
}

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

.nav-cta { margin-left: auto; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  text-decoration: none;
  border-radius: 9999px;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
  line-height: 1.3;
}

.btn-primary:hover { background: var(--color-charcoal); color: var(--color-on-primary); }
.btn-primary:disabled { background: var(--color-hairline); color: var(--color-muted); cursor: not-allowed; }

.btn-green {
  background: var(--color-brand-green);
  color: var(--color-primary);
}

.btn-green:hover { background: var(--color-brand-green-deep); color: var(--color-primary); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  background: transparent;
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  text-decoration: none;
  border-radius: 9999px;
  border: 1px solid var(--color-hairline);
  cursor: pointer;
  transition: border-color 0.15s;
  line-height: 1.3;
}

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

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
}

.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-canvas);
  z-index: 99;
  overflow-y: auto;
  padding: 24px;
  border-top: 1px solid var(--color-hairline);
}

.mobile-nav-drawer.open { display: block; }

.docs-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr var(--toc-width);
  min-height: calc(100vh - var(--nav-height));
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  gap: 32px;
}

.docs-sidebar {
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
  overflow-y: auto;
  padding: 32px 0;
  border-right: 1px solid var(--color-hairline-soft);
  scrollbar-width: thin;
}

.sidebar-section { margin-bottom: 20px; }

.sidebar-section-header {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-steel);
  padding: 16px 16px 4px;
}

.sidebar-nav-item {
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--color-steel);
  text-decoration: none;
  border-radius: 6px;
  transition: background 0.12s, color 0.12s;
}

.sidebar-nav-item:hover { color: var(--color-ink); background: var(--color-surface); }
.sidebar-nav-item.active { background: var(--color-surface); color: var(--color-ink); font-weight: 500; }

.docs-content {
  padding: 32px 0;
  max-width: var(--content-max);
  min-width: 0;
}

.docs-toc {
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
  overflow-y: auto;
  padding: 32px 0 32px 32px;
  scrollbar-width: thin;
}

.toc-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-steel);
  margin-bottom: 12px;
}

.toc-list { list-style: none; }

.toc-item a {
  display: block;
  font-size: 14px;
  color: var(--color-steel);
  text-decoration: none;
  padding: 4px 0;
  transition: color 0.12s;
}

.toc-item a:hover, .toc-item a.toc-active { color: var(--color-ink); }

.toc-item.level-3 a {
  padding-left: 16px;
  font-size: 13px;
}

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

.breadcrumbs a { color: var(--color-stone); text-decoration: none; }
.breadcrumbs a:hover { color: var(--color-ink); }
.breadcrumbs .sep { color: var(--color-muted); }
.breadcrumbs .current { color: var(--color-steel); }

.page-header { margin-bottom: 48px; }

.page-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-brand-green-deep);
  background: rgba(0, 212, 164, 0.1);
  padding: 4px 10px;
  border-radius: 9999px;
  margin-bottom: 16px;
}

.page-subtitle {
  font-size: 18px;
  line-height: 1.5;
  color: var(--color-steel);
}

.docs-content h1 {
  font-size: 48px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -1px;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.docs-content h2 {
  font-size: 28px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-ink);
  margin-top: 48px;
  margin-bottom: 16px;
  padding-top: 48px;
  border-top: 1px solid var(--color-hairline-soft);
}

.docs-content h3 {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-ink);
  margin-top: 32px;
  margin-bottom: 12px;
}

.docs-content h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-top: 24px;
  margin-bottom: 8px;
}

.docs-content p {
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-charcoal);
  margin-bottom: 16px;
}

.docs-content ul, .docs-content ol {
  margin-left: 32px;
  margin-bottom: 16px;
}

.docs-content li {
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-charcoal);
  margin-bottom: 8px;
}

.docs-content a {
  color: var(--color-brand-green-deep);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.docs-content code {
  font-family: 'SF Mono', Menlo, Consolas, 'Courier New', monospace;
  font-size: 13px;
  font-weight: 500;
  background: var(--color-surface);
  color: var(--color-charcoal);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--color-hairline);
}

.docs-content pre {
  background: var(--color-surface-code);
  color: var(--color-on-dark);
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 16px;
}

.docs-content pre code {
  background: none;
  border: none;
  color: var(--color-on-dark);
  padding: 0;
  font-size: 14px;
  font-weight: 400;
}

.docs-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 32px;
  font-size: 14px;
}

.docs-content th {
  text-align: left;
  padding: 12px 16px;
  background: var(--color-surface);
  color: var(--color-ink);
  font-weight: 600;
  border-bottom: 1px solid var(--color-hairline);
}

.docs-content td {
  padding: 12px 16px;
  color: var(--color-charcoal);
  border-bottom: 1px solid var(--color-hairline-soft);
}

.disclaimer-box {
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-left: 3px solid var(--color-brand-green);
  border-radius: 8px;
  padding: 16px 24px;
  margin: 32px 0;
  font-size: 14px;
  color: var(--color-steel);
  line-height: 1.5;
}

.disclaimer-box strong {
  color: var(--color-ink);
  display: block;
  margin-bottom: 6px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

details.faq-item {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline-soft);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 8px;
}

details.faq-item summary {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

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

details.faq-item summary::after {
  content: '+';
  font-size: 20px;
  color: var(--color-steel);
  flex-shrink: 0;
  line-height: 1;
}

details.faq-item[open] summary::after { content: '\2212'; }

details.faq-item .faq-body {
  margin-top: 16px;
  font-size: 16px;
  color: var(--color-charcoal);
  line-height: 1.5;
}

.related-section {
  border-top: 1px solid var(--color-hairline);
  padding-top: 32px;
  margin-top: 64px;
}

.related-section > h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-ink);
  margin: 0 0 16px;
  border: none;
  padding: 0;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.related-card {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: 12px;
  padding: 24px;
  text-decoration: none;
  transition: border-color 0.15s;
  display: block;
}

.related-card:hover { border-color: var(--color-brand-green); }

.related-card-tag {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-steel);
  margin-bottom: 6px;
}

.related-card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.3;
}

.hero-section {
  background: linear-gradient(180deg, #87a8c8 0%, #f5e9d8 100%);
  padding: 120px 32px;
  text-align: center;
}

.hero-content {
  max-width: 760px;
  margin: 0 auto;
}

.hero-content h1 {
  font-size: 56px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -1.5px;
  color: var(--color-ink);
  margin-bottom: 24px;
}

.hero-content p {
  font-size: 18px;
  line-height: 1.5;
  color: var(--color-charcoal);
  margin-bottom: 32px;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.home-main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}

.features-section {
  padding: 96px 0;
}

.section-title {
  font-size: 36px;
  font-weight: 600;
  letter-spacing: -0.5px;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--color-steel);
  margin-bottom: 48px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--color-surface);
  border-radius: 12px;
  padding: 32px;
}

.feature-icon {
  width: 40px;
  height: 40px;
  background: var(--color-brand-green);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 18px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--color-steel);
  line-height: 1.5;
  margin-bottom: 12px;
}

.feature-link {
  font-size: 14px;
  color: var(--color-brand-green-deep);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.guide-grid-section {
  padding: 64px 0;
  border-top: 1px solid var(--color-hairline-soft);
}

.guide-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.guide-list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 24px;
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: 12px;
  text-decoration: none;
  transition: border-color 0.15s;
}

.guide-list-item:hover { border-color: var(--color-brand-green); }

.guide-list-item .guide-num {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-brand-green-deep);
  background: rgba(0,212,164,0.1);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.guide-list-item .guide-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
}

.guide-list-item .guide-desc {
  font-size: 13px;
  color: var(--color-steel);
}

.site-footer {
  background: var(--color-canvas);
  border-top: 1px solid var(--color-hairline);
  padding: 64px 32px;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 32px;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-steel);
  line-height: 1.5;
  margin-bottom: 10px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.footer-col ul { list-style: none; }

.footer-col li { margin-bottom: 8px; }

.footer-col a {
  font-size: 14px;
  color: var(--color-steel);
  text-decoration: none;
  display: block;
  padding: 2px 0;
}

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

.footer-bottom {
  max-width: 1280px;
  margin: 32px auto 0;
  padding-top: 32px;
  border-top: 1px solid var(--color-hairline-soft);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-disclaimer {
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.5;
  flex: 1;
  min-width: 200px;
}

.footer-copyright {
  font-size: 12px;
  color: var(--color-muted);
  white-space: nowrap;
}

.cookie-banner {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: 12px;
  padding: 24px 32px;
  max-width: 600px;
  width: calc(100% - 48px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
  display: none;
  gap: 24px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.cookie-banner.show { display: flex; }

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

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

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

.cookie-btn-accept {
  padding: 8px 16px;
  background: var(--color-brand-green);
  color: var(--color-primary);
  border: none;
  border-radius: 9999px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
}

.cookie-btn-reject {
  padding: 8px 16px;
  background: transparent;
  color: var(--color-on-dark-muted);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 9999px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
}

.form-group { margin-bottom: 24px; }

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.form-input {
  width: 100%;
  height: 40px;
  padding: 12px 16px;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-size: 16px;
  font-family: inherit;
  border: 1px solid var(--color-hairline);
  border-radius: 8px;
  outline: none;
  transition: border 0.15s;
}

.form-input:focus {
  border: 2px solid var(--color-brand-green);
}

.form-hint {
  font-size: 13px;
  color: var(--color-stone);
  margin-top: 4px;
}

.form-success {
  display: none;
  padding: 16px 24px;
  background: rgba(0, 212, 164, 0.1);
  border: 1px solid var(--color-brand-green);
  border-radius: 8px;
  color: var(--color-ink);
  font-size: 16px;
  margin-top: 16px;
}

.topic-hero {
  background: var(--color-surface-soft);
  border-bottom: 1px solid var(--color-hairline-soft);
  padding: 64px 32px;
}

.topic-hero-inner {
  max-width: 760px;
  margin: 0 auto;
}

.topic-hero h1 {
  font-size: 48px;
  font-weight: 600;
  letter-spacing: -1px;
  line-height: 1.1;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.topic-hero p {
  font-size: 18px;
  color: var(--color-steel);
  line-height: 1.5;
}

.page-section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 64px 32px;
}

.contact-page-wrapper {
  max-width: 640px;
  margin: 0 auto;
  padding: 64px 32px;
}

@media (max-width: 1023px) {
  .docs-layout { grid-template-columns: 1fr; padding: 0 24px; }
  .docs-sidebar, .docs-toc { display: none; }
  .docs-content { max-width: 100%; }
  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 767px) {
  .hero-content h1 { font-size: 36px; letter-spacing: -0.5px; }
  .hero-section { padding: 80px 24px; }
  .features-section { padding: 64px 0; }
  .section-title { font-size: 28px; }
  .docs-content h1 { font-size: 32px; }
  .docs-content h2 { font-size: 22px; }
  .site-footer { padding: 48px 24px; }
  .footer-inner { grid-template-columns: 1fr; }
  .home-main { padding: 0 24px; }
  .contact-page-wrapper { padding: 48px 24px; }
}

@media (max-width: 479px) {
  .hero-content h1 { font-size: 28px; }
  .hero-buttons { flex-direction: column; align-items: stretch; }
  .cookie-banner { flex-direction: column; }
  .footer-bottom { flex-direction: column; }
}