/* One header (.ch) and one footer (.cf) for every page on amplifysystems.io.
   Used by components/site/chrome/SiteChrome.tsx and by public/os.html + public/avatar-success.html.
   Option b palette (Amplify design guide): navy page, blue-to-teal gradient button, amber focus ring. */
.ch, .cf {
  --chrome-navy: #07122B;
  --chrome-navy-rgb: 7, 18, 43;
  --chrome-head: #F3F6FF;
  --chrome-body: #C9D2E8;
  --chrome-muted: #B6BCD0;
  --chrome-link: #8FB2FF;
  --chrome-line: rgba(143, 178, 255, 0.14);
  --chrome-grad: linear-gradient(90deg, #3D7BFF 0%, #09C8A7 100%);
  --chrome-focus: #FFB547;
  --chrome-display: var(--font-display, 'Montserrat'), system-ui, sans-serif;
  --chrome-sans: var(--font-sans, 'DM Sans'), system-ui, sans-serif;
  box-sizing: border-box;
}
.ch *, .cf * { box-sizing: border-box; }

/* ── Header ── */
.ch { position: sticky; top: 0; z-index: 500; width: 100%; color: var(--chrome-head); font-family: var(--chrome-sans);
  transition: background-color .25s ease, box-shadow .25s ease, border-color .25s ease; border-bottom: 1px solid transparent; }
.ch[data-overlay="true"] { position: fixed; left: 0; right: 0; background: linear-gradient(rgba(var(--chrome-navy-rgb), .82), rgba(var(--chrome-navy-rgb), 0)); }
.ch.is-solid { background: rgba(var(--chrome-navy-rgb), .97); border-bottom-color: var(--chrome-line); box-shadow: 0 6px 24px rgba(0, 0, 0, .18); }
@supports (backdrop-filter: blur(12px)) { .ch.is-solid { backdrop-filter: blur(12px); background: rgba(var(--chrome-navy-rgb), .92); } }
.ch-bar { max-width: 1240px; margin: 0 auto; height: 72px; padding: 0 24px; display: flex; align-items: center; gap: 24px; }
.ch-logo { display: flex; align-items: center; flex-shrink: 0; }
.ch-logo img { display: block; height: 34px; width: auto; }
.ch-nav { flex: 1; display: flex; justify-content: center; }
.ch-links { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.ch-links a { display: block; padding: 8px 12px; border-radius: 6px; color: var(--chrome-head); text-decoration: none; font: 500 14.5px/1.2 var(--chrome-sans); text-shadow: 0 1px 2px rgba(0, 0, 0, .35); }
.ch-links a:hover { background: rgba(255, 255, 255, .08); }
.ch-actions { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.ch-login { color: var(--chrome-head); text-decoration: none; font: 500 14.5px/1.2 var(--chrome-sans); padding: 8px 10px; border-radius: 6px; text-shadow: 0 1px 2px rgba(0, 0, 0, .35); }
.ch-login:hover { background: rgba(255, 255, 255, .08); }
.ch-cta { display: inline-flex; align-items: center; gap: 8px; background: var(--chrome-grad); color: var(--chrome-navy); font: 700 14.5px/1 var(--chrome-display); text-decoration: none; padding: 12px 18px; border-radius: 8px; white-space: nowrap; }
.ch-cta:hover { filter: brightness(1.08); }
.ch-cta::after { content: '→'; font-family: var(--chrome-sans); }
.ch-toggle { display: none; width: 44px; height: 44px; border-radius: 8px; border: 1px solid rgba(255, 255, 255, .22); background: rgba(var(--chrome-navy-rgb), .35); cursor: pointer; padding: 0; flex-direction: column; align-items: center; justify-content: center; gap: 5px; }
.ch-toggle span { display: block; width: 18px; height: 2px; border-radius: 2px; background: var(--chrome-head); transition: transform .2s ease, opacity .2s ease; }
.ch.is-open .ch-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.ch.is-open .ch-toggle span:nth-child(2) { opacity: 0; }
.ch.is-open .ch-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.ch-menu { border-top: 1px solid var(--chrome-line); background: var(--chrome-navy); padding: 12px 24px 24px; max-height: calc(100vh - 72px); overflow-y: auto; }
.ch-menu[hidden] { display: none; }
.ch-menu ul { list-style: none; margin: 0 0 16px; padding: 0; }
.ch-menu li a { display: block; padding: 14px 4px; color: var(--chrome-head); text-decoration: none; font: 600 17px/1.2 var(--chrome-display); border-bottom: 1px solid var(--chrome-line); }
.ch-menu .ch-cta { width: 100%; justify-content: center; padding: 15px 18px; font-size: 16px; }
.ch.is-open { background: var(--chrome-navy); }
.ch a:focus-visible, .ch button:focus-visible, .cf a:focus-visible { outline: 3px solid var(--chrome-focus); outline-offset: 3px; border-radius: 6px; }
@media (max-width: 1060px) {
  .ch-nav, .ch-login { display: none; }
  .ch-toggle { display: flex; }
}
@media (max-width: 560px) {
  .ch-bar { padding: 0 16px; gap: 12px; height: 64px; }
  .ch-logo img { height: 30px; }
  .ch-actions > .ch-cta { display: none; }
  .ch-menu { max-height: calc(100vh - 64px); }
}

/* ── Footer ── */
.cf { position: relative; z-index: 1; background: var(--chrome-navy); color: var(--chrome-body); font-family: var(--chrome-sans); border-top: 1px solid var(--chrome-line); }
.cf-inner { max-width: 1240px; margin: 0 auto; padding: 56px 24px 36px; display: grid; grid-template-columns: 1.3fr repeat(5, 1fr); gap: 28px; }
.cf-brand img { display: block; height: 34px; width: auto; margin-bottom: 14px; }
.cf-brand p { margin: 0; font-size: 14px; line-height: 1.6; color: var(--chrome-muted); max-width: 30ch; }
.cf-title { margin: 0 0 12px; font: 700 12px/1 var(--chrome-sans); letter-spacing: .14em; text-transform: uppercase; color: var(--chrome-muted); }
.cf-col ul, .cf-legal { list-style: none; margin: 0; padding: 0; }
.cf-col li { margin-bottom: 9px; }
.cf-col a, .cf-legal a { color: var(--chrome-body); text-decoration: none; font-size: 14px; line-height: 1.4; word-break: break-word; }
.cf-col a:hover, .cf-legal a:hover { color: var(--chrome-head); text-decoration: underline; }
.cf-bottom { max-width: 1240px; margin: 0 auto; padding: 18px 24px 28px; border-top: 1px solid var(--chrome-line); display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.cf-bottom p { margin: 0; font-size: 13px; color: var(--chrome-muted); }
.cf-legal { display: flex; gap: 18px; }
.cf-legal a { font-size: 13px; }
@media (max-width: 1060px) { .cf-inner { grid-template-columns: repeat(3, 1fr); } .cf-brand { grid-column: 1 / -1; } }
@media (max-width: 720px) { .cf-inner { grid-template-columns: 1fr 1fr; } .cf-brand { grid-column: 1 / -1; } }
@media (max-width: 480px) { .cf-inner { grid-template-columns: 1fr; padding: 44px 16px 28px; } .cf-bottom { padding: 18px 16px 28px; } }
/* Pages with the phone sticky book bar keep the footer clear of it. */
@media (max-width: 768px) { .sp-has-sticky .cf-bottom { padding-bottom: 96px; } }
/* In-page links (#book, #faq) land below the sticky header. */
html { scroll-padding-top: 88px; }