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

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

:root {
  --canvas: #f7f7f4;
  --canvas-soft: #fafaf7;
  --surface-card: #ffffff;
  --surface-strong: #e6e5e0;
  --hairline: #e6e5e0;
  --hairline-soft: #efeee8;
  --hairline-strong: #cfcdc4;
  --ink: #26251e;
  --body: #5a5852;
  --body-strong: #26251e;
  --muted: #807d72;
  --muted-soft: #a09c92;
  --primary: #f54e00;
  --primary-active: #d04200;
  --on-primary: #ffffff;
  --success: #1f8a65;
  --error: #cf2d56;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;
  --spacing-xxs: 4px;
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-base: 16px;
  --spacing-md: 20px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  --spacing-section: 80px;
  --font-body: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --max-width: 1200px;
}

html { font-size: 16px; scroll-behavior: smooth; }
body { background: var(--canvas); color: var(--body); font-family: var(--font-body); line-height: 1.5; -webkit-font-smoothing: antialiased; }

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

img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }

h1, h2, h3, h4, h5, h6 { color: var(--ink); font-weight: 400; line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: clamp(2rem, 5vw, 4.5rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.4rem, 3vw, 2.25rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.1rem, 2vw, 1.625rem); letter-spacing: -0.01em; }
h4 { font-size: 1.125rem; font-weight: 600; letter-spacing: 0; }
p { margin-bottom: 1em; color: var(--body); }
strong { color: var(--body-strong); font-weight: 600; }
code, pre { font-family: var(--font-mono); font-size: 0.8125rem; }
pre { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 1.25rem; overflow-x: auto; }
code { background: var(--surface-strong); padding: 2px 6px; border-radius: var(--radius-xs); font-size: 0.8125rem; color: var(--ink); }
ul, ol { padding-left: 1.5rem; margin-bottom: 1em; }
li { margin-bottom: 0.25em; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-lg); }
.container-narrow { max-width: 720px; margin: 0 auto; padding: 0 var(--spacing-lg); }

.site-header { background: var(--canvas); border-bottom: 1px solid var(--hairline); position: sticky; top: 0; z-index: 100; height: 64px; display: flex; align-items: center; }
.site-header .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.site-logo { font-size: 1.125rem; font-weight: 600; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.site-logo:hover { text-decoration: none; color: var(--primary); }
.nav-links { display: flex; align-items: center; gap: var(--spacing-xl); list-style: none; padding: 0; margin: 0; }
.nav-links a { font-size: 0.875rem; font-weight: 500; color: var(--body); text-decoration: none; transition: color 0.15s; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-links a.active { color: var(--ink); }
.nav-hamburger { display: none; background: none; border: none; cursor: pointer; padding: var(--spacing-xs); }
.nav-hamburger span { display: block; width: 20px; height: 2px; background: var(--ink); margin: 4px 0; transition: 0.3s; }
.mobile-nav { display: none; position: fixed; top: 64px; left: 0; right: 0; background: var(--canvas); border-bottom: 1px solid var(--hairline); padding: var(--spacing-lg); z-index: 99; }
.mobile-nav.open { display: block; }
.mobile-nav a { display: block; font-size: 1rem; font-weight: 500; color: var(--ink); padding: var(--spacing-sm) 0; border-bottom: 1px solid var(--hairline-soft); text-decoration: none; }
.mobile-nav a:last-child { border-bottom: none; }

.btn-primary { display: inline-flex; align-items: center; background: var(--primary); color: var(--on-primary); font-family: var(--font-body); font-size: 0.875rem; font-weight: 500; padding: 10px 18px; border-radius: var(--radius-md); border: none; cursor: pointer; text-decoration: none; transition: background 0.15s; height: 40px; }
.btn-primary:hover { background: var(--primary-active); text-decoration: none; color: var(--on-primary); }
.btn-secondary { display: inline-flex; align-items: center; background: var(--surface-card); color: var(--ink); font-family: var(--font-body); font-size: 0.875rem; font-weight: 500; padding: 10px 18px; border-radius: var(--radius-md); border: 1px solid var(--hairline-strong); cursor: pointer; text-decoration: none; transition: background 0.15s; height: 40px; }
.btn-secondary:hover { background: var(--surface-strong); text-decoration: none; color: var(--ink); }

.hero { padding: var(--spacing-section) 0; border-bottom: 1px solid var(--hairline); }
.hero-content { max-width: 760px; }
.hero-label { font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.55px; text-transform: uppercase; color: var(--muted); margin-bottom: var(--spacing-md); }
.hero h1 { margin-bottom: var(--spacing-lg); }
.hero-desc { font-size: 1rem; color: var(--body); max-width: 560px; margin-bottom: var(--spacing-xl); line-height: 1.5; }
.hero-image { margin-top: var(--spacing-xxl); border-radius: var(--radius-lg); border: 1px solid var(--hairline); overflow: hidden; }
.hero-image img { width: 100%; height: 320px; object-fit: cover; border-radius: 0; }

.section { padding: var(--spacing-section) 0; }
.section-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: var(--spacing-xl); border-bottom: 1px solid var(--hairline); padding-bottom: var(--spacing-lg); }
.section-label { font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.55px; text-transform: uppercase; color: var(--muted); margin-bottom: var(--spacing-xs); }
.section-title { font-size: clamp(1.375rem, 2.5vw, 2.25rem); color: var(--ink); font-weight: 400; letter-spacing: -0.02em; }
.section-link { font-size: 0.875rem; font-weight: 500; color: var(--primary); white-space: nowrap; }

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

.card { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: var(--spacing-lg); display: flex; flex-direction: column; transition: border-color 0.15s; }
.card:hover { border-color: var(--hairline-strong); }
.card-image { margin: calc(-1 * var(--spacing-lg)) calc(-1 * var(--spacing-lg)) var(--spacing-lg); border-radius: var(--radius-lg) var(--radius-lg) 0 0; overflow: hidden; }
.card-image img { width: 100%; height: 180px; object-fit: cover; border-radius: 0; }
.card-category { font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.55px; text-transform: uppercase; color: var(--muted); margin-bottom: var(--spacing-xs); }
.card-title { font-size: 1.125rem; font-weight: 600; color: var(--ink); margin-bottom: var(--spacing-sm); line-height: 1.3; letter-spacing: -0.01em; }
.card-title a { color: var(--ink); text-decoration: none; }
.card-title a:hover { color: var(--primary); text-decoration: none; }
.card-desc { font-size: 0.875rem; color: var(--body); line-height: 1.5; margin-bottom: var(--spacing-base); flex: 1; }
.card-meta { font-size: 0.8125rem; color: var(--muted); margin-top: auto; padding-top: var(--spacing-sm); border-top: 1px solid var(--hairline-soft); }

.page-hero { padding: var(--spacing-section) 0 var(--spacing-xl); border-bottom: 1px solid var(--hairline); }
.page-hero .breadcrumb { margin-bottom: var(--spacing-md); }
.page-hero h1 { margin-bottom: var(--spacing-md); }
.page-hero .page-desc { font-size: 1rem; color: var(--body); max-width: 600px; line-height: 1.6; }

.breadcrumb { display: flex; align-items: center; gap: var(--spacing-xs); font-size: 0.8125rem; color: var(--muted); list-style: none; padding: 0; flex-wrap: wrap; }
.breadcrumb li::after { content: '/'; margin-left: var(--spacing-xs); color: var(--hairline-strong); }
.breadcrumb li:last-child::after { content: ''; }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb li:last-child { color: var(--body-strong); }

.toc { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: var(--spacing-lg); margin-bottom: var(--spacing-xl); }
.toc-title { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.55px; text-transform: uppercase; color: var(--muted); margin-bottom: var(--spacing-sm); }
.toc ol { padding-left: 1.25rem; margin: 0; }
.toc li { margin-bottom: 0.35em; }
.toc a { font-size: 0.875rem; color: var(--body); text-decoration: none; }
.toc a:hover { color: var(--ink); }

.article-body { padding: var(--spacing-xxl) 0; }
.article-body h2 { margin-top: var(--spacing-xxl); margin-bottom: var(--spacing-base); font-size: clamp(1.25rem, 2vw, 1.75rem); font-weight: 400; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin-top: var(--spacing-xl); margin-bottom: var(--spacing-sm); font-size: 1.125rem; font-weight: 600; }
.article-body p { margin-bottom: var(--spacing-base); line-height: 1.6; }
.article-body ul, .article-body ol { margin-bottom: var(--spacing-base); padding-left: 1.5rem; }
.article-body li { margin-bottom: 0.4em; line-height: 1.5; }

.disclaimer-box { background: var(--surface-card); border: 1px solid var(--hairline); border-left: 3px solid var(--primary); border-radius: 0 var(--radius-md) var(--radius-md) 0; padding: var(--spacing-base) var(--spacing-lg); margin-bottom: var(--spacing-xl); }
.disclaimer-box p { font-size: 0.875rem; color: var(--body); margin: 0; line-height: 1.5; }

.related-section { padding: var(--spacing-xxl) 0; border-top: 1px solid var(--hairline); margin-top: var(--spacing-xxl); }
.related-section h2 { font-size: 1.375rem; margin-bottom: var(--spacing-lg); }

.hub-intro { padding: var(--spacing-xxl) 0; }
.hub-intro p { font-size: 1.0625rem; line-height: 1.7; max-width: 720px; }

.two-col { display: grid; grid-template-columns: 1fr 2fr; gap: var(--spacing-xxl); }
.sidebar-nav { position: sticky; top: 80px; }
.sidebar-nav ul { list-style: none; padding: 0; }
.sidebar-nav li { margin-bottom: var(--spacing-xs); }
.sidebar-nav a { font-size: 0.875rem; color: var(--body); text-decoration: none; padding: var(--spacing-xs) var(--spacing-sm); display: block; border-radius: var(--radius-sm); }
.sidebar-nav a:hover { background: var(--surface-strong); color: var(--ink); }
.sidebar-nav a.active { background: var(--surface-strong); color: var(--ink); font-weight: 600; }

.site-footer { background: var(--canvas); border-top: 1px solid var(--hairline); padding: 64px 0 var(--spacing-xxl); margin-top: var(--spacing-section); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--spacing-xl); margin-bottom: var(--spacing-xxl); }
.footer-brand .site-logo { margin-bottom: var(--spacing-base); display: block; }
.footer-brand p { font-size: 0.875rem; color: var(--muted); line-height: 1.5; max-width: 280px; }
.footer-col h4 { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.55px; text-transform: uppercase; color: var(--ink); margin-bottom: var(--spacing-base); }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: var(--spacing-xs); }
.footer-col a { font-size: 0.875rem; color: var(--muted); text-decoration: none; }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { border-top: 1px solid var(--hairline); padding-top: var(--spacing-lg); }
.footer-disclaimers { margin-bottom: var(--spacing-base); }
.footer-disclaimers p { font-size: 0.8125rem; color: var(--muted); line-height: 1.5; margin-bottom: var(--spacing-xs); }
.footer-copy { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--spacing-sm); }
.footer-copy p { font-size: 0.8125rem; color: var(--muted); margin: 0; }
.footer-legal-links { display: flex; gap: var(--spacing-base); flex-wrap: wrap; }
.footer-legal-links a { font-size: 0.8125rem; color: var(--muted); text-decoration: none; }
.footer-legal-links a:hover { color: var(--ink); }

.cookie-banner { position: fixed; bottom: 0; left: 0; right: 0; background: var(--ink); color: var(--canvas); padding: var(--spacing-base) var(--spacing-lg); display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-lg); z-index: 1000; flex-wrap: wrap; }
.cookie-banner p { font-size: 0.875rem; margin: 0; color: var(--canvas-soft); flex: 1; min-width: 200px; }
.cookie-banner a { color: var(--primary); }
.cookie-actions { display: flex; gap: var(--spacing-sm); flex-shrink: 0; }
.cookie-accept { background: var(--primary); color: var(--on-primary); border: none; padding: 8px 16px; border-radius: var(--radius-md); font-size: 0.875rem; font-weight: 500; cursor: pointer; font-family: var(--font-body); }
.cookie-reject { background: transparent; color: var(--muted-soft); border: 1px solid var(--muted); padding: 8px 16px; border-radius: var(--radius-md); font-size: 0.875rem; cursor: pointer; font-family: var(--font-body); }

.contact-form { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: var(--spacing-xl); max-width: 560px; }
.form-group { margin-bottom: var(--spacing-base); }
.form-group label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--ink); margin-bottom: var(--spacing-xs); }
.form-group input, .form-group textarea { width: 100%; background: var(--canvas); border: 1px solid var(--hairline-strong); border-radius: var(--radius-md); padding: 12px 16px; font-size: 0.9375rem; font-family: var(--font-body); color: var(--ink); height: 44px; transition: border-color 0.15s; }
.form-group textarea { height: auto; min-height: 100px; resize: vertical; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); }
.form-group input.error, .form-group textarea.error { border-color: var(--error); }
.form-error { font-size: 0.8125rem; color: var(--error); margin-top: var(--spacing-xs); display: none; }
.form-success { background: var(--surface-card); border: 1px solid var(--hairline); border-left: 3px solid var(--success); border-radius: 0 var(--radius-md) var(--radius-md) 0; padding: var(--spacing-base) var(--spacing-lg); display: none; }
.form-success p { margin: 0; color: var(--success); font-weight: 500; }
.btn-submit { min-width: 140px; justify-content: center; }
.btn-loading { opacity: 0.7; pointer-events: none; }

.tag-pill { display: inline-flex; align-items: center; background: var(--surface-strong); color: var(--muted); font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.55px; text-transform: uppercase; padding: 4px 10px; border-radius: var(--radius-pill); text-decoration: none; }
.tag-pill:hover { background: var(--hairline-strong); color: var(--ink); text-decoration: none; }

.featured-banner { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: var(--spacing-xl); margin-bottom: var(--spacing-xxl); display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-xl); align-items: center; }
.featured-banner-content .tag-pill { margin-bottom: var(--spacing-md); }
.featured-banner-content h2 { font-size: clamp(1.25rem, 2vw, 1.75rem); margin-bottom: var(--spacing-sm); }
.featured-banner-content p { font-size: 0.9375rem; color: var(--body); line-height: 1.6; margin-bottom: var(--spacing-base); }
.featured-banner-image img { border-radius: var(--radius-md); height: 240px; width: 100%; object-fit: cover; }

.overview-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-lg); margin-bottom: var(--spacing-xl); }
.overview-card { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: var(--spacing-lg); }
.overview-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: var(--spacing-sm); }
.overview-card p { font-size: 0.875rem; color: var(--body); margin: 0; line-height: 1.5; }

details summary { cursor: pointer; font-weight: 600; color: var(--ink); padding: var(--spacing-sm) 0; border-bottom: 1px solid var(--hairline-soft); list-style: none; display: flex; justify-content: space-between; align-items: center; }
details summary::after { content: '+'; font-size: 1.25rem; color: var(--muted); }
details[open] summary::after { content: '−'; }
details { margin-bottom: var(--spacing-sm); }
details p { padding: var(--spacing-sm) 0; color: var(--body); font-size: 0.9375rem; line-height: 1.6; }

.page-nav-links { display: flex; justify-content: space-between; margin-top: var(--spacing-xxl); padding-top: var(--spacing-lg); border-top: 1px solid var(--hairline); }
.page-nav-links a { font-size: 0.875rem; color: var(--primary); text-decoration: none; }
.page-nav-prev::before { content: '← '; }
.page-nav-next::after { content: ' →'; }

@media (max-width: 1024px) { .card-grid { grid-template-columns: repeat(2, 1fr); } .footer-grid { grid-template-columns: 1fr 1fr; } .featured-banner { grid-template-columns: 1fr; } .featured-banner-image { order: -1; } .two-col { grid-template-columns: 1fr; } }
@media (max-width: 768px) { .nav-links { display: none; } .nav-hamburger { display: block; } .card-grid, .card-grid-2 { grid-template-columns: 1fr; } .overview-grid { grid-template-columns: 1fr; } .section-header { flex-direction: column; gap: var(--spacing-sm); } .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--spacing-lg); } .cookie-banner { flex-direction: column; align-items: flex-start; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } .footer-copy { flex-direction: column; align-items: flex-start; } .hero { padding: var(--spacing-xxl) 0; } .section { padding: var(--spacing-xxl) 0; } }