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

:root {
  --color-primary: #f54e00;
  --color-primary-active: #d04200;
  --color-canvas: #f7f7f4;
  --color-canvas-soft: #fafaf7;
  --color-surface-card: #ffffff;
  --color-surface-strong: #e6e5e0;
  --color-hairline: #e6e5e0;
  --color-hairline-soft: #efeee8;
  --color-hairline-strong: #cfcdc4;
  --color-ink: #26251e;
  --color-body: #5a5852;
  --color-body-strong: #26251e;
  --color-muted: #807d72;
  --color-muted-soft: #a09c92;
  --color-on-primary: #ffffff;
  --color-success: #1f8a65;
  --color-error: #cf2d56;
  --font-sans: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-canvas);
  color: var(--color-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

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

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

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

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

.nav-logo {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: -0.3px;
}

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

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

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-body);
  line-height: 1.4;
  transition: color 0.15s;
}

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

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

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-ink);
  border-radius: 2px;
  transition: 0.2s;
}

.nav-mobile {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--color-canvas);
  border-bottom: 1px solid var(--color-hairline);
  z-index: 99;
  padding: 16px 24px;
}

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

.nav-mobile ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.nav-mobile a {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-body);
}

.hero-band {
  padding: 80px 0;
  background-color: var(--color-canvas);
}

.hero-band .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-content {}

.badge-pill {
  display: inline-flex;
  align-items: center;
  background-color: var(--color-surface-strong);
  color: var(--color-ink);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  border-radius: var(--radius-pill);
  padding: 4px 10px;
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-sans);
  font-size: 56px;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -1.5px;
  color: var(--color-ink);
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 16px;
  color: var(--color-body);
  line-height: 1.5;
  max-width: 480px;
  margin-bottom: 32px;
}

.hero-meta {
  font-size: 13px;
  color: var(--color-muted);
}

.hero-image-card {
  background-color: var(--color-surface-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-hairline);
  overflow: hidden;
}

.hero-image-card img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.hero-image-caption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-hairline-soft);
  font-family: var(--font-sans);
}

.section { padding: 80px 0; }

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

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

.section-sub {
  font-size: 16px;
  color: var(--color-body);
  line-height: 1.5;
  max-width: 600px;
  margin-bottom: 48px;
}

.divider {
  border: none;
  border-top: 1px solid var(--color-hairline);
  margin: 0;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.cards-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

.feature-card-icon {
  font-size: 24px;
  margin-bottom: 16px;
}

.feature-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.4;
  margin-bottom: 8px;
}

.feature-card-body {
  font-size: 14px;
  color: var(--color-body);
  line-height: 1.5;
}

.article-card {
  background-color: var(--color-surface-card);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.article-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.article-card-body {
  padding: 20px 24px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

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

.article-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.4;
  margin-bottom: 8px;
}

.article-card-title a { color: var(--color-ink); }
.article-card-title a:hover { color: var(--color-primary); }

.article-card-excerpt {
  font-size: 14px;
  color: var(--color-body);
  line-height: 1.5;
  flex: 1;
  margin-bottom: 16px;
}

.article-card-meta {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: auto;
}

.section-alt { background-color: var(--color-surface-card); }

.info-band {
  padding: 80px 0;
  background-color: var(--color-canvas-soft);
  border-top: 1px solid var(--color-hairline);
  border-bottom: 1px solid var(--color-hairline);
}

.info-band .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.info-band-content {}

.info-band-img-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-hairline);
}

.info-band-img-wrap img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.stats-row {
  display: flex;
  gap: 48px;
  margin-top: 32px;
}

.stat-item {}

.stat-number {
  font-size: 36px;
  font-weight: 400;
  color: var(--color-ink);
  letter-spacing: -0.72px;
  line-height: 1.1;
}

.stat-label {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 4px;
}

.article-header {
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--color-hairline);
}

.article-breadcrumb {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.article-breadcrumb a { color: var(--color-muted); }
.article-breadcrumb a:hover { color: var(--color-ink); }
.article-breadcrumb span { margin: 0 6px; }

.article-title {
  font-size: 42px;
  font-weight: 400;
  color: var(--color-ink);
  letter-spacing: -1px;
  line-height: 1.15;
  max-width: 800px;
  margin-bottom: 16px;
}

.article-meta {
  font-size: 14px;
  color: var(--color-muted);
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.article-body {
  padding: 48px 0 80px;
}

.article-body .container {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 64px;
  align-items: start;
}

.article-content { max-width: none; }

.article-content h2 {
  font-size: 26px;
  font-weight: 400;
  color: var(--color-ink);
  letter-spacing: -0.325px;
  line-height: 1.25;
  margin: 40px 0 16px;
}

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.4;
  margin: 28px 0 12px;
}

.article-content p {
  font-size: 16px;
  color: var(--color-body);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin: 0 0 20px 24px;
  font-size: 16px;
  color: var(--color-body);
  line-height: 1.6;
}

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

.article-content a { color: var(--color-primary); text-decoration: underline; }
.article-content a:hover { color: var(--color-primary-active); }

.article-content figure {
  margin: 32px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-hairline);
}

.article-content figure img {
  width: 100%;
  height: 340px;
  object-fit: cover;
}

.article-content figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-canvas-soft);
  border-top: 1px solid var(--color-hairline-soft);
}

.info-box {
  background-color: var(--color-surface-card);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin: 28px 0;
}

.info-box-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.info-box ul {
  margin: 0;
  padding-left: 20px;
}

.info-box ul li {
  font-size: 14px;
  color: var(--color-body);
  margin-bottom: 6px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 14px;
}

.data-table th {
  background-color: var(--color-surface-strong);
  color: var(--color-ink);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.3px;
  text-align: left;
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-hairline-strong);
}

.data-table td {
  padding: 10px 16px;
  color: var(--color-body);
  border-bottom: 1px solid var(--color-hairline-soft);
  vertical-align: top;
}

.data-table tr:last-child td { border-bottom: none; }

.article-sidebar { position: sticky; top: 88px; }

.sidebar-card {
  background-color: var(--color-surface-card);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 14px;
}

.toc-list {
  list-style: none;
  padding: 0;
}

.toc-list li { margin-bottom: 6px; }

.toc-list a {
  font-size: 14px;
  color: var(--color-body);
  line-height: 1.4;
}

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

.related-list {
  list-style: none;
  padding: 0;
}

.related-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-hairline-soft);
}

.related-list li:last-child { border-bottom: none; }

.related-list a {
  font-size: 14px;
  color: var(--color-body);
  line-height: 1.4;
}

.related-list a:hover { color: var(--color-primary); }

.contact-section {
  padding: 80px 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  background-color: var(--color-surface-card);
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  height: 44px;
  font-size: 14px;
  font-family: var(--font-sans);
  color: var(--color-ink);
  outline: none;
  transition: border-color 0.15s;
}

.form-control:focus { border-color: var(--color-ink); }

.form-control.error { border-color: var(--color-error); }

textarea.form-control {
  height: auto;
  min-height: 120px;
  resize: vertical;
}

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

.btn-primary:hover { background-color: var(--color-primary-active); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.form-message {
  display: none;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  margin-top: 16px;
}

.form-message.success {
  background-color: #f0faf6;
  border: 1px solid #b3e0d0;
  color: var(--color-success);
}

.form-message.error {
  background-color: #fdf0f3;
  border: 1px solid #f5b8c4;
  color: var(--color-error);
}

.contact-info h3 {
  font-size: 26px;
  font-weight: 400;
  color: var(--color-ink);
  letter-spacing: -0.3px;
  margin-bottom: 16px;
}

.contact-info p {
  font-size: 15px;
  color: var(--color-body);
  line-height: 1.6;
  margin-bottom: 24px;
}

.contact-detail {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-detail-item {
  font-size: 14px;
  color: var(--color-body);
}

.contact-detail-item strong {
  color: var(--color-ink);
  display: block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  margin-bottom: 2px;
}

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

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

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-hairline);
}

.footer-brand {}

.footer-brand-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 10px;
}

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

.footer-brand-desc {
  font-size: 14px;
  color: var(--color-body);
  line-height: 1.5;
  max-width: 280px;
}

.footer-col-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: 0.3px;
  text-transform: uppercase;
  margin-bottom: 14px;
}

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

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

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

.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

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

.footer-disclaimer {
  font-size: 12px;
  color: var(--color-muted-soft);
  max-width: 600px;
  text-align: right;
}

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-ink);
  color: var(--color-canvas);
  z-index: 9999;
  padding: 16px 24px;
  display: none;
}

.cookie-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

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

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

.cookie-actions {
  display: flex;
  gap: 10px;
  flex-shrink: 0;
}

.btn-cookie-accept {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background-color 0.15s;
}

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

.btn-cookie-reject {
  background-color: transparent;
  color: var(--color-canvas);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(247,247,244,0.35);
  cursor: pointer;
  transition: border-color 0.15s;
}

.btn-cookie-reject:hover { border-color: rgba(247,247,244,0.65); }

.page-hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--color-hairline);
}

.page-hero-title {
  font-size: 42px;
  font-weight: 400;
  color: var(--color-ink);
  letter-spacing: -1px;
  line-height: 1.15;
  margin-bottom: 12px;
}

.page-hero-sub {
  font-size: 16px;
  color: var(--color-body);
  max-width: 560px;
}

.prose-section {
  padding: 56px 0;
}

.prose {
  max-width: 760px;
}

.prose h2 {
  font-size: 26px;
  font-weight: 400;
  color: var(--color-ink);
  letter-spacing: -0.3px;
  margin: 40px 0 14px;
}

.prose h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
  margin: 28px 0 10px;
}

.prose p {
  font-size: 16px;
  color: var(--color-body);
  line-height: 1.65;
  margin-bottom: 18px;
}

.prose ul, .prose ol {
  margin: 0 0 18px 22px;
  font-size: 16px;
  color: var(--color-body);
  line-height: 1.6;
}

.prose li { margin-bottom: 6px; }

.prose strong { color: var(--color-ink); font-weight: 600; }

.prose a { color: var(--color-primary); text-decoration: underline; }
.prose a:hover { color: var(--color-primary-active); }

.updated-date {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 6px;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: none;
}

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

@media (max-width: 1024px) {
  .hero-title { font-size: 44px; }
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  .hero-band .container { grid-template-columns: 1fr; gap: 40px; }
  .hero-title { font-size: 36px; }

  .cards-grid { grid-template-columns: 1fr; }
  .cards-grid-2 { grid-template-columns: 1fr; }

  .info-band .container { grid-template-columns: 1fr; gap: 32px; }

  .article-body .container { grid-template-columns: 1fr; }
  .article-sidebar { display: none; }

  .contact-grid { grid-template-columns: 1fr; gap: 40px; }

  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-disclaimer { text-align: left; }

  .section-title { font-size: 28px; }
  .article-title { font-size: 30px; }
  .page-hero-title { font-size: 30px; }

  .stats-row { flex-wrap: wrap; gap: 24px; }
}

@media (max-width: 480px) {
  .footer-top { grid-template-columns: 1fr; }
  .hero-title { font-size: 30px; }
}