:root {
  color-scheme: dark;
  --bg-base: #0a0a0a;
  --text-primary: #f5f5f5;
  --text-secondary: #bdbdbd;
  --text-muted: #a3a3a3;
  --accent: #4db6ac;
  --border-subtle: rgba(255, 255, 255, .10);
  --border-light: rgba(255, 255, 255, .18);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; overscroll-behavior: none; background-color: var(--bg-base); }
body { overscroll-behavior: none; margin: 0; background: var(--bg-base); color: var(--text-primary); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; -webkit-font-smoothing: antialiased; }
a, button, summary { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
a { color: inherit; }
button { font: inherit; }
a:focus-visible, button:focus-visible, summary:focus-visible, [tabindex="0"]:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; border-radius: 6px; }
[id] { scroll-margin-top: 16px; }
h1, h2, h3 { text-wrap: balance; }
p { text-wrap: pretty; }
.skip-link { position: fixed; top: 12px; left: 16px; z-index: 2000; padding: 12px 20px; background: #f5f5f5; color: #0a0a0a; border-radius: 8px; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
/* Fade one persistent glass layer; keep the links and header geometry stable. */
.site-nav { position: fixed; inset: 0 0 auto; z-index: 1000; isolation: isolate; padding: 0 max(24px, env(safe-area-inset-right)) 0 max(24px, env(safe-area-inset-left)); border-bottom: 1px solid transparent; background: transparent; -webkit-backdrop-filter: none; backdrop-filter: none; }
/* Feather the glass below the links instead of ending it in a dark strip. */
.site-nav::before { content: ''; position: absolute; inset: -24px 0 -20px; z-index: 0; pointer-events: none; background: rgba(10, 10, 10, .78); -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px); -webkit-mask-image: linear-gradient(to bottom, #000 calc(100% - 20px), transparent); mask-image: linear-gradient(to bottom, #000 calc(100% - 20px), transparent); opacity: var(--header-opacity, 0); transition: opacity .16s ease-out; }
.interior .site-nav::before { opacity: 1; }
.site-nav-inner { position: relative; z-index: 1; max-width: 1200px; min-height: 84px; margin: auto; display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.site-brand { display: inline-flex; flex-shrink: 0; align-items: center; min-height: 44px; }
.site-brand img { display: block; width: 158px; height: auto; }
.site-nav-links { display: flex; align-items: center; gap: 30px; }
.site-nav-links > a { text-decoration: none; font-size: 14px; font-weight: 500; }
.site-nav-links > a:not(.button) { color: var(--text-secondary); padding: 12px 0; }
.site-nav-links > a:hover { color: var(--text-primary); opacity: 1; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 50px; padding: 13px 24px; background: #ffffff; color: #101010; border: 1px solid transparent; border-radius: 100px; font-size: 15px; line-height: 1.4; font-weight: 650; text-decoration: none; cursor: pointer; transition: transform .18s ease, background-color .18s ease, box-shadow .18s ease; }
.button svg { width: 18px; height: 18px; flex-shrink: 0; }
.button:hover, .site-nav-links > .button:hover { background: #eaeaea; color: #101010; box-shadow: 0 8px 30px #0003; opacity: 1; transform: translateY(-2px); }
.button:active { transform: translateY(0); }
.site-nav .button { min-height: 44px; padding: 10px 20px; font-size: 14px; }
.site-footer { padding: 30px max(24px, env(safe-area-inset-right)) 30px max(24px, env(safe-area-inset-left)); border-top: 1px solid var(--border-subtle); background: #0a0a0a; }
.site-footer-inner { max-width: 1200px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.site-footer-brand { display: flex; align-items: center; gap: 12px; color: var(--text-muted); font-size: 13px; }
.site-footer-brand img { width: 28px; height: 28px; border-radius: 7px; }
.site-footer-links { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.site-footer-links a { display: inline-flex; align-items: center; min-height: 44px; font-size: 14px; color: var(--text-secondary); text-decoration: none; }
.site-footer-links a:hover { color: var(--accent); opacity: 1; }
.interior .gradient-bg { background: #0a0a0a; }
.interior { line-height: 1.7; }
.interior .page-header { padding: 140px 24px 44px; margin: 0; }
.interior .page-header h1 { font-size: clamp(32px, 5vw, 48px); line-height: 1.15; }
.interior .content-card, .interior .contact-card, .interior .faq-item, .interior .link-card { background: #141414; -webkit-backdrop-filter: none; backdrop-filter: none; border-color: var(--border-subtle); }
.interior .content-card { padding: 32px; }
.interior p, .interior li { font-size: 16px; }
.interior .container { max-width: 860px; }
.interior .table-scroll { overflow-x: auto; max-width: 100%; margin: 24px 0; border: 1px solid var(--border-subtle); border-radius: 12px; scrollbar-color: #666666 #141414; }
.interior .table-scroll table { margin: 0; min-width: 560px; }
.interior .data-table th { color: var(--accent); background: #1a1a1a; }
.interior .data-table th, .interior .data-table td { padding: 16px; }
.interior .toc h2 { font-size: 18px; margin: 0 0 16px; padding: 0; border: 0; }
.interior .toc a { display: inline-block; padding: 4px 0; }
.support-page main { padding: 0 24px 72px; max-width: 820px; }
.support-page .page-header { padding-left: 0; padding-right: 0; }
.support-page .contact-card { padding: 32px; margin-bottom: 48px; }
.support-page .contact-email { max-width: 100%; overflow-wrap: anywhere; font-size: 15px; padding: 14px 20px; }
.support-page .faq-item { padding: 0 24px; margin-bottom: 12px; }
.support-page .faq-item summary { padding: 22px 28px 22px 0; font-size: 17px; font-weight: 600; cursor: pointer; position: relative; list-style: none; }
.support-page .faq-item summary::-webkit-details-marker { display: none; }
.support-page .faq-item summary::after { content: '+'; position: absolute; right: 0; color: var(--accent); font-size: 24px; top: 15px; }
.support-page .faq-item[open] summary::after { content: '−'; }
.support-page .faq-item p { padding-bottom: 24px; margin: 0; }
.support-page .faq-item[open] summary { color: var(--accent); }
.support-page .contact-address { margin: 16px 0 0; font-size: 14px; }
.support-page .response-time { color: var(--text-muted); font-size: 14px; }
@media (max-width: 640px) {
  .site-nav { padding-left: max(20px, env(safe-area-inset-left)); padding-right: max(20px, env(safe-area-inset-right)); }
  .site-nav-inner { min-height: 72px; gap: 12px; }
  .site-brand img { width: 132px; }
  .site-nav-links { gap: 0; }
  .site-nav-links > a:not(.button) { display: none; }
  .site-nav .button { padding: 10px 15px; font-size: 13px; }
  .site-footer-inner { flex-direction: column; gap: 12px; }
  .site-footer-links { justify-content: center; gap: 8px 20px; }
  .interior .page-header { padding-top: 116px; padding-bottom: 36px; }
  .interior .container { padding-left: 20px; padding-right: 20px; }
  .interior .content-card, .support-page .contact-card { padding: 24px 20px; }
  .support-page main { padding-left: 20px; padding-right: 20px; }
  .support-page .faq-item { padding: 0 20px; }
  .interior .links-section { grid-template-columns: 1fr; }
  .table-scroll::before { content: "Scroll to view all columns →"; display: block; position: sticky; left: 0; width: 100%; box-sizing: border-box; padding: 10px 16px; color: var(--accent); background: #1a1a1a; font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}