@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700;800&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --ph-canvas: #eeefe9;
  --ph-surface-soft: #e5e7e0;
  --ph-surface-card: #ffffff;
  --ph-surface-doc: #fcfcfa;
  --ph-surface-dark: #23251d;
  --ph-ink: #23251d;
  --ph-body: #4d4f46;
  --ph-charcoal: #33342d;
  --ph-mute: #6c6e63;
  --ph-ash: #9b9c92;
  --ph-hairline: #bfc1b7;
  --ph-hairline-soft: #dcdfd2;
  --ph-primary: #f7a501;
  --ph-primary-pressed: #dd9001;
  --ph-on-primary: #23251d;
  --ph-on-dark: #ffffff;
  --ph-link-teal: #1078a3;
  --ph-accent-blue: #2c84e0;
  --ph-accent-blue-soft: #dceaf6;
  --ph-accent-green: #2c8c66;
  --ph-accent-green-soft: #d9eddf;
  --ph-accent-red: #cd4239;
  --ph-accent-red-soft: #f7d6d3;
  --ph-accent-purple: #7c44a6;
  --ph-accent-purple-soft: #e7d8ee;
  --ph-success: #2c8c66;
  --ph-error: #cd4239;
  --font-main: 'IBM Plex Sans', -apple-system, system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
}

body { background: var(--ph-canvas) !important; color: var(--ph-body); font-family: var(--font-main); }

a { color: var(--ph-link-teal); }
a:hover { color: var(--ph-ink); }

h1, h2, h3, h4, h5, h6 { color: var(--ph-ink); font-family: var(--font-main); }
h1 { font-size: clamp(1.75rem, 4vw, 2.25rem); font-weight: 700; line-height: 1.5; }
h2 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); font-weight: 800; line-height: 1.33; letter-spacing: -0.6px; }
h3 { font-size: 1.3125rem; font-weight: 700; line-height: 1.4; letter-spacing: -0.5px; }
h4 { font-size: 1.25rem; font-weight: 700; line-height: 1.4; }
p { color: var(--ph-body); line-height: 1.5; }
code { font-family: var(--font-mono); font-size: 0.875rem; background: var(--ph-surface-soft); color: var(--ph-ink); padding: 2px 6px; border-radius: 2px; }
pre { background: var(--ph-surface-dark); color: var(--ph-on-dark); font-family: var(--font-mono); font-size: 0.875rem; padding: 16px 20px; border-radius: 6px; overflow-x: auto; }

.ph-card { background: var(--ph-surface-card); border: 1px solid var(--ph-hairline); border-radius: 6px; padding: 24px; }
.ph-card-sm { padding: 20px; }
.ph-doc-card { background: var(--ph-surface-doc); border: 1px solid var(--ph-hairline); border-radius: 6px; padding: 24px; }

.site-header { background: var(--ph-canvas); border-bottom: 1px solid var(--ph-hairline); position: sticky; top: 0; z-index: 100; height: 56px; display: flex; align-items: center; }
.site-header .container-fluid { display: flex; align-items: center; justify-content: space-between; }
.site-logo { font-size: 1rem; font-weight: 700; color: var(--ph-ink); text-decoration: none; letter-spacing: -0.01em; }
.site-logo:hover { color: var(--ph-primary); text-decoration: none; }
.nav-menu { display: flex; align-items: center; gap: 24px; list-style: none; padding: 0; margin: 0; }
.nav-menu a { font-size: 1rem; font-weight: 600; color: var(--ph-body); text-decoration: none; transition: color 0.15s; }
.nav-menu a:hover { color: var(--ph-ink); }
.nav-cta { background: var(--ph-primary); color: var(--ph-on-primary); font-size: 0.875rem; font-weight: 700; padding: 8px 16px; border-radius: 9999px; text-decoration: none; transition: background 0.15s; white-space: nowrap; }
.nav-cta:hover { background: var(--ph-primary-pressed); color: var(--ph-on-primary); text-decoration: none; }
.nav-hamburger-btn { background: none; border: none; cursor: pointer; padding: 8px; display: none; }
.nav-hamburger-btn span { display: block; width: 20px; height: 2px; background: var(--ph-ink); margin: 4px 0; }
.mobile-nav-panel { display: none; position: fixed; top: 56px; left: 0; right: 0; background: var(--ph-canvas); border-bottom: 1px solid var(--ph-hairline); padding: 20px 24px; z-index: 99; }
.mobile-nav-panel.open { display: block; }
.mobile-nav-panel a { display: block; font-size: 1rem; font-weight: 600; color: var(--ph-ink); padding: 10px 0; border-bottom: 1px solid var(--ph-hairline-soft); text-decoration: none; }
.mobile-nav-panel a:last-child { border-bottom: none; }

.btn-primary-ph { background: var(--ph-primary); color: var(--ph-on-primary); font-family: var(--font-main); font-size: 0.875rem; font-weight: 700; padding: 8px 16px; height: 40px; border-radius: 6px; border: none; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; transition: background 0.15s; }
.btn-primary-ph:hover { background: var(--ph-primary-pressed); color: var(--ph-on-primary); text-decoration: none; }
.btn-secondary-ph { background: var(--ph-surface-soft); color: var(--ph-ink); font-size: 0.875rem; font-weight: 700; padding: 8px 16px; height: 40px; border-radius: 6px; border: none; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; font-family: var(--font-main); transition: background 0.15s; }
.btn-secondary-ph:hover { background: var(--ph-hairline); color: var(--ph-ink); text-decoration: none; }

.page-hero { padding: 80px 0 48px; border-bottom: 1px solid var(--ph-hairline); }
.page-hero h1 { margin-bottom: 16px; }
.page-hero .page-desc { font-size: 1rem; color: var(--ph-mute); max-width: 640px; line-height: 1.6; }
.section-eyebrow { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0; color: var(--ph-mute); margin-bottom: 8px; }

.sidebar-layout { display: grid; grid-template-columns: 240px 1fr; gap: 48px; align-items: start; padding: 48px 0; }
.doc-sidebar { position: sticky; top: 80px; }
.doc-sidebar .sidebar-title { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; color: var(--ph-mute); margin-bottom: 12px; letter-spacing: 0; }
.doc-sidebar nav ul { list-style: none; padding: 0; margin: 0; }
.doc-sidebar nav li { margin-bottom: 2px; }
.doc-sidebar nav a { display: block; font-size: 0.875rem; font-weight: 500; color: var(--ph-body); padding: 6px 10px; border-radius: 4px; text-decoration: none; transition: background 0.1s, color 0.1s; line-height: 1.43; }
.doc-sidebar nav a:hover { background: var(--ph-surface-soft); color: var(--ph-ink); }
.doc-sidebar nav a.active { background: var(--ph-surface-soft); color: var(--ph-ink); font-weight: 600; }
.doc-sidebar .sidebar-section { margin-bottom: 20px; }
.doc-sidebar .sidebar-section-title { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; color: var(--ph-ink); padding: 6px 10px 4px; letter-spacing: 0; }

.breadcrumb-ph { display: flex; align-items: center; gap: 6px; font-size: 0.875rem; color: var(--ph-mute); list-style: none; padding: 0; margin-bottom: 20px; flex-wrap: wrap; }
.breadcrumb-ph li::after { content: '/'; margin-left: 6px; color: var(--ph-hairline); }
.breadcrumb-ph li:last-child::after { content: ''; }
.breadcrumb-ph a { color: var(--ph-mute); text-decoration: none; }
.breadcrumb-ph a:hover { color: var(--ph-ink); }

.toc-block { background: var(--ph-surface-card); border: 1px solid var(--ph-hairline); border-radius: 6px; padding: 20px; margin-bottom: 32px; }
.toc-block .toc-title { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; color: var(--ph-mute); margin-bottom: 10px; }
.toc-block ol { padding-left: 1.25rem; margin: 0; }
.toc-block li { margin-bottom: 4px; }
.toc-block a { font-size: 0.875rem; color: var(--ph-body); text-decoration: none; font-weight: 500; }
.toc-block a:hover { color: var(--ph-ink); }

.article-body h2 { font-size: 1.3125rem; font-weight: 700; letter-spacing: -0.5px; margin-top: 40px; margin-bottom: 12px; color: var(--ph-ink); }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { font-size: 1.125rem; font-weight: 700; margin-top: 28px; margin-bottom: 10px; color: var(--ph-ink); }
.article-body p { font-size: 0.9375rem; color: var(--ph-body); line-height: 1.71; margin-bottom: 14px; }
.article-body ul, .article-body ol { margin-bottom: 14px; padding-left: 1.5rem; }
.article-body li { font-size: 0.9375rem; color: var(--ph-body); line-height: 1.71; margin-bottom: 4px; }

.callout-blue { background: var(--ph-accent-blue-soft); color: var(--ph-ink); border-radius: 6px; padding: 16px 20px; margin-bottom: 24px; }
.callout-green { background: var(--ph-accent-green-soft); color: var(--ph-ink); border-radius: 6px; padding: 16px 20px; margin-bottom: 24px; }
.callout-red { background: var(--ph-accent-red-soft); color: var(--ph-ink); border-radius: 6px; padding: 16px 20px; margin-bottom: 24px; }
.callout-purple { background: var(--ph-accent-purple-soft); color: var(--ph-ink); border-radius: 6px; padding: 16px 20px; margin-bottom: 24px; }
.callout-blue p, .callout-green p, .callout-red p, .callout-purple p { margin: 0; font-size: 0.9375rem; }

.disclaimer-note { background: var(--ph-accent-blue-soft); color: var(--ph-ink); border-radius: 6px; padding: 16px 20px; margin-bottom: 24px; }
.disclaimer-note p { margin: 0; font-size: 0.875rem; }

.compare-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; margin-bottom: 24px; }
.compare-table th { background: var(--ph-surface-soft); color: var(--ph-ink); font-weight: 700; padding: 10px 14px; text-align: left; border: 1px solid var(--ph-hairline); font-size: 0.8125rem; }
.compare-table td { padding: 10px 14px; border: 1px solid var(--ph-hairline-soft); color: var(--ph-body); vertical-align: top; background: var(--ph-surface-card); }
.compare-table tr:nth-child(even) td { background: var(--ph-surface-doc); }

.related-section { padding: 40px 0; border-top: 1px solid var(--ph-hairline); margin-top: 40px; }
.related-section h2 { font-size: 1.125rem; font-weight: 700; margin-bottom: 20px; }
.related-card { background: var(--ph-surface-card); border: 1px solid var(--ph-hairline); border-radius: 6px; padding: 20px; height: 100%; }
.related-card .eyebrow { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; color: var(--ph-mute); margin-bottom: 6px; }
.related-card h4 { font-size: 1rem; font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
.related-card h4 a { color: var(--ph-ink); text-decoration: none; }
.related-card h4 a:hover { color: var(--ph-link-teal); }
.related-card p { font-size: 0.875rem; color: var(--ph-mute); margin: 0; }

.hero-cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 40px; }

.site-footer { background: var(--ph-canvas); border-top: 1px solid var(--ph-hairline); padding: 48px 0 32px; margin-top: 80px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
.footer-brand p { font-size: 0.875rem; color: var(--ph-mute); line-height: 1.5; margin-top: 12px; max-width: 260px; }
.footer-col-title { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; color: var(--ph-ink); margin-bottom: 12px; letter-spacing: 0; }
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: 6px; }
.footer-col a { font-size: 0.875rem; color: var(--ph-mute); text-decoration: none; }
.footer-col a:hover { color: var(--ph-ink); }
.footer-bottom { border-top: 1px solid var(--ph-hairline); padding-top: 20px; }
.footer-disclaimers p { font-size: 0.8125rem; color: var(--ph-mute); line-height: 1.5; margin-bottom: 6px; }
.footer-copy-row { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.footer-copy-row p { font-size: 0.8125rem; color: var(--ph-mute); margin: 0; }
.footer-legal-links { display: flex; gap: 16px; flex-wrap: wrap; }
.footer-legal-links a { font-size: 0.8125rem; color: var(--ph-mute); text-decoration: none; }
.footer-legal-links a:hover { color: var(--ph-ink); }

.cookie-banner { position: fixed; bottom: 0; left: 0; right: 0; background: var(--ph-surface-card); border-top: 1px solid var(--ph-hairline); padding: 16px 24px; display: flex; align-items: center; justify-content: space-between; gap: 20px; z-index: 1000; flex-wrap: wrap; box-shadow: 0 -2px 8px rgba(0,0,0,0.06); }
.cookie-banner p { font-size: 0.875rem; color: var(--ph-body); margin: 0; flex: 1; min-width: 200px; }
.cookie-actions { display: flex; gap: 10px; flex-shrink: 0; }
.cookie-accept-btn { background: var(--ph-primary); color: var(--ph-on-primary); border: none; padding: 8px 16px; border-radius: 6px; font-size: 0.875rem; font-weight: 700; cursor: pointer; font-family: var(--font-main); }
.cookie-reject-btn { background: var(--ph-surface-soft); color: var(--ph-body); border: none; padding: 8px 16px; border-radius: 6px; font-size: 0.875rem; cursor: pointer; font-family: var(--font-main); }

.contact-form-wrap { background: var(--ph-surface-card); border: 1px solid var(--ph-hairline); border-radius: 6px; padding: 32px; max-width: 540px; }
.ph-form-group { margin-bottom: 16px; }
.ph-form-group label { display: block; font-size: 0.875rem; font-weight: 600; color: var(--ph-ink); margin-bottom: 6px; }
.ph-form-group input, .ph-form-group textarea { width: 100%; background: var(--ph-surface-card); border: 1px solid var(--ph-hairline); border-radius: 6px; padding: 8px 12px; font-size: 1rem; font-family: var(--font-main); color: var(--ph-ink); height: 36px; transition: border-color 0.15s; }
.ph-form-group textarea { height: auto; min-height: 100px; resize: vertical; }
.ph-form-group input:focus, .ph-form-group textarea:focus { outline: none; border-color: var(--ph-accent-blue); box-shadow: 0 0 0 3px rgba(59,130,246,0.2); }
.ph-form-group input.is-invalid { border-color: var(--ph-accent-red); }
.ph-form-error { font-size: 0.8125rem; color: var(--ph-accent-red); margin-top: 4px; display: none; }
.ph-form-success { background: var(--ph-accent-green-soft); border-radius: 6px; padding: 16px 20px; display: none; margin-bottom: 16px; }
.ph-form-success p { margin: 0; font-size: 0.9375rem; color: var(--ph-accent-green); font-weight: 600; }

details { border-bottom: 1px solid var(--ph-hairline-soft); }
details summary { cursor: pointer; font-weight: 600; color: var(--ph-ink); padding: 14px 0; list-style: none; display: flex; justify-content: space-between; align-items: center; font-size: 0.9375rem; }
details summary::after { content: '+'; color: var(--ph-mute); font-size: 1.1rem; }
details[open] summary::after { content: '−'; }
details > div { padding: 0 0 16px; }
details > div p { font-size: 0.9375rem; color: var(--ph-body); margin: 0; line-height: 1.6; }

@media (max-width: 1024px) { .sidebar-layout { grid-template-columns: 200px 1fr; gap: 32px; } .hero-cards-grid { grid-template-columns: repeat(2, 1fr); } .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 768px) { .nav-menu { display: none; } .nav-hamburger-btn { display: block; } .sidebar-layout { grid-template-columns: 1fr; } .doc-sidebar { position: static; } .hero-cards-grid { grid-template-columns: 1fr; } .footer-grid { grid-template-columns: 1fr 1fr; gap: 20px; } .page-hero { padding: 48px 0 32px; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } .footer-copy-row { flex-direction: column; align-items: flex-start; } .cookie-banner { flex-direction: column; align-items: flex-start; } }