/* Northbrook Change Brief — ClickHouse Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --primary: #faff69;
  --primary-active: #e6eb52;
  --ink: #ffffff;
  --body: #cccccc;
  --body-strong: #e6e6e6;
  --muted: #888888;
  --muted-soft: #5a5a5a;
  --hairline: #2a2a2a;
  --hairline-strong: #3a3a3a;
  --canvas: #0a0a0a;
  --surface-soft: #121212;
  --surface-card: #1a1a1a;
  --surface-elevated: #242424;
  --on-primary: #0a0a0a;
  --on-dark: #ffffff;
  --accent-emerald: #22c55e;
  --accent-rose: #ef4444;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: 'Inter', -apple-system, system-ui, sans-serif; background: var(--canvas); color: var(--body); line-height: 1.55; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; color: var(--primary-active); }
img { max-width: 100%; display: block; }

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

/* Header */
.site-header { background: var(--canvas); border-bottom: 1px solid var(--hairline); height: 64px; display: flex; align-items: center; position: sticky; top: 0; z-index: 100; }
.header-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; width: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand-link { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 15px; color: var(--ink); text-decoration: none; }
.brand-link:hover { color: var(--primary); text-decoration: none; }
.brand-mark { width: 28px; height: 28px; background: var(--primary); border-radius: 6px; color: var(--on-primary); font-size: 11px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.site-nav { display: flex; align-items: center; gap: 24px; }
.site-nav a { font-size: 14px; font-weight: 500; color: var(--muted); text-decoration: none; }
.site-nav a:hover { color: var(--ink); }
.site-nav a.active { color: var(--primary); }
.burger-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; flex-direction: column; }
.burger-btn span { display: block; width: 20px; height: 2px; background: var(--ink); margin: 4px 0; }
.mobile-nav { display: none; }

@media (max-width: 768px) {
  .site-nav { display: none; }
  .burger-btn { display: flex; }
  .mobile-nav { position: fixed; top: 64px; left: 0; right: 0; bottom: 0; background: var(--canvas); z-index: 99; flex-direction: column; padding: 24px; border-top: 1px solid var(--hairline); overflow-y: auto; }
  .mobile-nav.open { display: flex; }
  .mobile-nav a { font-size: 16px; font-weight: 500; color: var(--body); padding: 14px 0; border-bottom: 1px solid var(--hairline); text-decoration: none; }
  .mobile-nav a:hover { color: var(--ink); }
  body.nav-open { overflow: hidden; }
}

/* Hero */
.hero { background: var(--canvas); padding: 80px 0; border-bottom: 1px solid var(--hairline); }
.hero-badge { display: inline-block; background: var(--surface-card); color: var(--on-dark); font-size: 12px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; padding: 4px 12px; border-radius: 9999px; margin-bottom: 20px; }
.hero h1 { font-size: 56px; font-weight: 700; color: var(--ink); line-height: 1.1; letter-spacing: -2px; max-width: 700px; margin-bottom: 16px; }
.hero h1 span { color: var(--primary); }
.hero p { font-size: 17px; color: var(--body); max-width: 520px; line-height: 1.6; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
@media (max-width: 640px) { .hero h1 { font-size: 36px; letter-spacing: -1px; } .hero { padding: 52px 0; } }

/* Buttons */
.btn-primary { display: inline-flex; align-items: center; background: var(--primary); color: var(--on-primary); font-size: 14px; font-weight: 600; padding: 10px 20px; border-radius: 8px; border: none; cursor: pointer; text-decoration: none; transition: background .15s; height: 40px; }
.btn-primary:hover { background: var(--primary-active); color: var(--on-primary); text-decoration: none; }
.btn-secondary { display: inline-flex; align-items: center; background: var(--surface-card); color: var(--on-dark); font-size: 14px; font-weight: 600; padding: 10px 20px; border-radius: 8px; border: 1px solid var(--hairline-strong); cursor: pointer; text-decoration: none; transition: background .15s; height: 40px; }
.btn-secondary:hover { background: var(--surface-elevated); text-decoration: none; color: var(--on-dark); }

/* Sections */
.section { padding: 72px 0; }
.section-dark { padding: 72px 0; background: var(--surface-soft); }
.section-yellow { background: var(--primary); padding: 56px 0; }
.section-yellow h2 { font-size: 36px; font-weight: 700; color: var(--on-primary); letter-spacing: -1.5px; margin-bottom: 12px; }
.section-yellow p { font-size: 16px; color: rgba(0,0,0,0.7); margin-bottom: 24px; }
.section-label { font-size: 12px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--muted); margin-bottom: 12px; }
.section-title { font-size: 40px; font-weight: 700; color: var(--ink); letter-spacing: -1.5px; line-height: 1.15; margin-bottom: 16px; }
.section-sub { font-size: 16px; color: var(--body); max-width: 540px; line-height: 1.6; margin-bottom: 40px; }

/* Cards */
.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 900px) { .cards-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .cards-grid { grid-template-columns: 1fr; } }

.card { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: 12px; padding: 28px; }
.card-yellow { background: var(--primary); border: none; }
.card-tag { font-size: 12px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--muted); margin-bottom: 12px; }
.card-yellow .card-tag { color: rgba(0,0,0,0.6); }
.card h3 { font-size: 18px; font-weight: 600; color: var(--ink); margin-bottom: 8px; line-height: 1.35; }
.card-yellow h3 { color: var(--on-primary); }
.card p { font-size: 14px; color: var(--body); line-height: 1.55; margin-bottom: 16px; }
.card-yellow p { color: rgba(0,0,0,0.7); }
.card-link { font-size: 14px; font-weight: 600; color: var(--primary); }
.card-yellow .card-link { color: var(--on-primary); }
.card-link:hover { text-decoration: underline; }

/* Gallery */
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 900px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .gallery-grid { grid-template-columns: 1fr; } }
.gallery-item { border-radius: 12px; overflow: hidden; border: 1px solid var(--hairline); }
.gallery-item img { width: 100%; height: 200px; object-fit: cover; }
.gallery-caption { padding: 10px 14px; font-size: 13px; color: var(--muted); background: var(--surface-card); }

/* Feature article */
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 768px) { .feature-row { grid-template-columns: 1fr; } }
.feature-row h2 { font-size: 32px; font-weight: 700; color: var(--ink); letter-spacing: -1px; line-height: 1.2; margin-bottom: 12px; }
.feature-row p { font-size: 16px; color: var(--body); line-height: 1.65; margin-bottom: 20px; }
.feature-img-wrap { border-radius: 12px; overflow: hidden; border: 1px solid var(--hairline); }
.feature-img-wrap img { width: 100%; height: 260px; object-fit: cover; }

/* Page hero */
.page-hero { padding: 52px 0 40px; border-bottom: 1px solid var(--hairline); background: var(--surface-soft); }
.page-hero h1 { font-size: 40px; font-weight: 700; color: var(--ink); letter-spacing: -1.5px; margin-bottom: 8px; }
.page-hero p { font-size: 16px; color: var(--body); max-width: 580px; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { color: var(--hairline-strong); }

/* Article */
.article-layout { display: grid; grid-template-columns: 1fr 280px; gap: 48px; align-items: start; }
@media (max-width: 900px) { .article-layout { grid-template-columns: 1fr; } }
.article-meta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; font-size: 13px; color: var(--muted); }
.article-category { background: var(--surface-card); color: var(--on-dark); font-size: 12px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; padding: 3px 10px; border-radius: 9999px; }
.article-title { font-size: 40px; font-weight: 700; color: var(--ink); letter-spacing: -1.5px; line-height: 1.1; margin-bottom: 12px; }
.article-summary { font-size: 17px; color: var(--body-strong); line-height: 1.65; padding: 16px 20px; background: var(--surface-card); border-left: 3px solid var(--primary); border-radius: 0 8px 8px 0; margin-bottom: 28px; }
.article-body h2 { font-size: 24px; font-weight: 700; color: var(--ink); margin: 32px 0 12px; letter-spacing: -0.3px; }
.article-body h3 { font-size: 18px; font-weight: 600; color: var(--ink); margin: 24px 0 10px; }
.article-body p { font-size: 16px; color: var(--body); line-height: 1.7; margin-bottom: 16px; }
.article-body ul, .article-body ol { padding-left: 20px; margin-bottom: 16px; }
.article-body li { font-size: 16px; color: var(--body); line-height: 1.7; margin-bottom: 6px; }
.article-img { border-radius: 12px; overflow: hidden; border: 1px solid var(--hairline); margin: 28px 0; }
.article-img img { width: 100%; height: 320px; object-fit: cover; }
.article-img figcaption { padding: 10px 14px; font-size: 13px; color: var(--muted); background: var(--surface-card); }
.not-covered { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: 12px; padding: 20px 24px; margin: 32px 0; }
.not-covered h3 { font-size: 12px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 10px; }
.not-covered ul { padding-left: 18px; }
.not-covered li { font-size: 14px; color: var(--body); margin-bottom: 6px; }
.related-articles { margin-top: 40px; padding-top: 28px; border-top: 1px solid var(--hairline); }
.related-articles h3 { font-size: 16px; font-weight: 700; color: var(--ink); margin-bottom: 14px; }
.related-list { display: flex; flex-direction: column; gap: 10px; }
.related-item { padding: 14px 16px; background: var(--surface-card); border: 1px solid var(--hairline); border-radius: 8px; }
.related-item a { font-size: 14px; font-weight: 600; color: var(--ink); text-decoration: none; }
.related-item a:hover { color: var(--primary); }
.related-item span { display: block; font-size: 12px; color: var(--muted); margin-top: 3px; }

/* Key context */
.key-context { background: var(--surface-card); border: 1px solid var(--hairline); border-left: 3px solid var(--primary); border-radius: 0 12px 12px 0; padding: 20px 24px; margin: 28px 0; }
.key-context h3 { font-size: 12px; font-weight: 600; color: var(--primary); text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 12px; }
.key-context ul { padding-left: 18px; }
.key-context li { font-size: 15px; color: var(--body); line-height: 1.65; margin-bottom: 8px; }

/* TOC */
.toc-box { background: var(--surface-card); border: 1px solid var(--hairline); border-radius: 12px; padding: 20px; position: sticky; top: 80px; }
.toc-box h4 { font-size: 12px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 14px; }
.toc-box a { display: block; font-size: 14px; color: var(--muted); padding: 6px 0; border-bottom: 1px solid var(--hairline); text-decoration: none; }
.toc-box a:last-child { border-bottom: none; }
.toc-box a:hover { color: var(--primary); }

/* Contact form */
.contact-form { display: flex; flex-direction: column; gap: 16px; max-width: 520px; }
.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%; font-family: inherit; padding: 10px 14px; border: 1px solid var(--hairline-strong); border-radius: 8px; font-size: 16px; color: var(--on-dark); background: var(--surface-card); outline: none; transition: border-color .15s; }
.form-group input:focus, .form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { min-height: 110px; resize: vertical; height: auto; }
.form-confirm { display: none; padding: 14px 16px; background: var(--surface-card); border: 1px solid var(--accent-emerald); color: var(--accent-emerald); border-radius: 8px; font-size: 15px; font-weight: 600; }
.form-confirm.show { display: block; }

/* Footer */
.site-footer { background: var(--canvas); border-top: 1px solid var(--hairline); padding: 56px 0 32px; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
@media (max-width: 768px) { .footer-inner { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-inner { grid-template-columns: 1fr; } }
.footer-brand h3 { font-size: 15px; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.footer-brand p { font-size: 14px; color: var(--muted); line-height: 1.55; max-width: 280px; }
.footer-col h4 { font-size: 12px; font-weight: 600; color: var(--ink); letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 14px; }
.footer-col a { display: block; font-size: 14px; color: var(--muted); margin-bottom: 8px; text-decoration: none; }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { border-top: 1px solid var(--hairline); padding-top: 20px; font-size: 13px; color: var(--muted-soft); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* Cookie banner */
.cookie-banner { position: fixed; bottom: 0; left: 0; right: 0; background: var(--surface-card); color: var(--on-dark); padding: 16px 24px; z-index: 999; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; border-top: 1px solid var(--hairline); }
.cookie-banner.hidden { display: none; }
.cookie-banner p { font-size: 14px; color: var(--body); flex: 1; min-width: 200px; }
.cookie-banner a { color: var(--primary); }
.cookie-actions { display: flex; gap: 8px; flex-shrink: 0; }
.cookie-actions button { font-size: 13px; font-weight: 600; padding: 8px 14px; border-radius: 8px; cursor: pointer; font-family: inherit; border: none; }
.btn-accept { background: var(--primary); color: var(--on-primary); }
.btn-accept:hover { background: var(--primary-active); }
.btn-reject { background: var(--surface-elevated); color: var(--body); }
.btn-reject:hover { color: var(--ink); }
.btn-settings { background: var(--surface-elevated); color: var(--body); }
.btn-settings:hover { color: var(--ink); }