/* Shared styles for ManyMath marketing sites.
   Requires tokens/manymath-brand.css, fonts.css, fallbacks.css (linked first).
   Page HTML has no inline stylesheet. Product copy is set in build_sites.py.
   See brand/BRAND.md §4-§7. Generated sites: do not edit per-site copies;
   edit brand/site-template/site.css and re-run tool/build_sites.py. */

* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg); color: var(--fg);
  font-family: var(--font-ui); font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-underline-offset: 3px; }
.wrap { width: min(1180px, 100% - 40px); margin: 0 auto; }

.skip-link {
  position: fixed; z-index: 100; top: 8px; left: 8px;
  transform: translateY(-160%);
  background: var(--surface); color: var(--fg);
  padding: 10px 14px; border-radius: var(--radius);
  box-shadow: 0 8px 30px rgba(10, 20, 14, 0.18);
}
.skip-link:focus { transform: translateY(0); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 12px max(20px, calc((100vw - 1180px) / 2));
  background: rgba(243, 246, 244, 0.92);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  border-bottom: 1px solid var(--border);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
}
@media (prefers-color-scheme: dark) {
  .site-header {
    background: rgba(16, 21, 18, 0.92);
    background: color-mix(in srgb, var(--bg) 92%, transparent);
  }
}
:root[data-theme="dark"] .site-header { background: rgba(16, 21, 18, 0.92); background: color-mix(in srgb, var(--bg) 92%, transparent); }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { width: 30px; height: 30px; display: block; }
.brand span { font-family: var(--font-display); font-size: 21px; font-weight: 700; }
nav { display: flex; gap: 4px; align-items: center; }
nav a {
  min-height: 38px; display: inline-flex; align-items: center; padding: 0 12px;
  border-radius: var(--radius); color: var(--fg-muted); font-size: 14px;
  font-weight: 550; text-decoration: none;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
nav a:hover { background: var(--surface-2); color: var(--fg); }
nav a.cta { background: var(--brand); color: var(--brand-on); font-weight: 650; }
nav a.cta:hover { background: var(--brand-strong); }

/* Hero — copy beside an app-frame card; text never overlays imagery (§4) */
.hero { padding: clamp(48px, 8vh, 96px) 0; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(28px, 5vw, 72px); align-items: center; }
.eyebrow {
  margin: 0 0 12px; color: var(--brand); font-size: 13px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
}
h1 { font-family: var(--font-display); font-size: clamp(40px, 5.4vw, 64px); font-weight: 700; line-height: 1.05; text-wrap: balance; }
.hero p.summary { margin: 20px 0 0; max-width: 34rem; color: var(--fg-muted); font-size: 18px; line-height: 1.55; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.button {
  min-height: 46px; display: inline-flex; align-items: center; gap: 9px; padding: 0 18px;
  border-radius: var(--radius); font-size: 15px; font-weight: 650; text-decoration: none;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.button:active { transform: scale(0.97); }
.button-primary { background: var(--brand); color: var(--brand-on); }
.button-primary:hover { background: var(--brand-strong); }
.button-quiet { border: 1px solid var(--border); background: var(--surface); color: var(--fg); }
.button-quiet:hover { background: var(--surface-2); }

.app-frame {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); overflow: hidden;
  box-shadow: 0 18px 44px -28px rgba(10, 20, 14, 0.28);
}
.app-frame .titlebar {
  height: 30px; display: flex; align-items: center; gap: 8px; padding: 0 12px;
  background: var(--surface-2); border-bottom: 1px solid var(--border);
}
.app-frame .titlebar i { width: 8px; height: 8px; border-radius: 50%; background: var(--border); }
.app-frame .titlebar i:first-child { background: var(--danger); }
.app-frame .titlebar span { margin-left: 6px; color: var(--fg-muted); font-size: 11px; font-family: var(--font-mono); }
.app-frame img { display: block; width: 100%; height: auto; }

/* Fade between preview themes over a static base image (BRAND.md 4).
   The 16-second cycle uses one-second fades. With reduced motion,
   overlays stay hidden and only the base image is shown. */
.theme-fade { position: relative; }
.theme-fade img:not(.base) {
  position: absolute; inset: 0; opacity: 0;
  animation: theme-xfade 16s ease-in-out infinite;
}
@keyframes theme-xfade {
  0% { opacity: 0; }
  6.25% { opacity: 1; }
  25% { opacity: 1; }
  31.25% { opacity: 0; }
  100% { opacity: 0; }
}

/* CSS product illustrations for sites without screenshots */
.mock { padding: 16px; font-size: 12.5px; min-height: 280px; background: var(--surface); }
.mock .msg { max-width: 82%; padding: 8px 11px; margin-bottom: 9px; border-radius: var(--radius); background: var(--surface-2); }
.mock .msg b { display: block; margin-bottom: 2px; color: var(--brand); font-size: 11px; font-weight: 650; }
.mock .msg p { color: var(--fg); line-height: 1.45; }
.mock .msg.self { margin-left: auto; background: var(--brand-soft); }
.mock .row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 8px; border-bottom: 1px solid var(--border); font-family: var(--font-mono); font-size: 11.5px; }
.mock .row:last-child { border-bottom: none; }
.mock .row .name { display: inline-flex; align-items: center; gap: 9px; color: var(--fg); }
.mock .row .meta { color: var(--fg-muted); }
.mock .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--brand); flex-shrink: 0; }
.mock .dot.dim { background: var(--border); }

/* Bands */
.band { padding: 64px 0; border-top: 1px solid var(--border); }
.band h2 { font-family: var(--font-display); font-size: clamp(28px, 3vw, 36px); line-height: 1.15; text-wrap: balance; }
.band .lede { margin-top: 14px; max-width: 62ch; color: var(--fg-muted); font-size: 17px; }
.cols { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 28px; }
.col { padding: 22px 26px; border-right: 1px solid var(--border); border-top: 3px solid transparent; transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease); }
.col:last-child { border-right: none; }
.col:hover { background: var(--surface); border-top-color: var(--brand); }
.col h3 { font-size: 16px; font-weight: 650; margin-bottom: 8px; }
.col p { color: var(--fg-muted); font-size: 15px; }

/* This section inverts the page colors. Its eyebrow uses the opposite
   theme's green to preserve contrast. */
.dark-band { background: var(--fg); color: var(--bg); padding: 72px 0; }
.dark-band .eyebrow { color: #78c87c; }
@media (prefers-color-scheme: dark) { .dark-band .eyebrow { color: #236827; } }
:root[data-theme="dark"] .dark-band .eyebrow { color: #236827; }
.dark-band h2 { font-family: var(--font-display); font-size: clamp(28px, 3.4vw, 40px); max-width: 22ch; }
.dark-band p { margin-top: 18px; max-width: 60ch; opacity: 0.82; font-size: 17px; }

/* Contact strip */
.contact { margin-top: 34px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.contact .button { min-height: 42px; }
.contact p { color: var(--fg-muted); font-size: 14px; }

/* Ecosystem band — canonical component, identical markup on every site (§5) */
.eco-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; margin-top: 30px; }
.eco-card {
  grid-column: span 2; padding: 20px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease);
}
.eco-card:hover { border-color: var(--brand); }
.eco-card.featured { border-color: var(--brand); }
.eco-card:nth-last-child(-n+2) { grid-column: span 3; }
.eco-card img { width: 34px; height: 34px; display: block; margin-bottom: 16px; }
.eco-card .cat { margin: 0 0 4px; color: var(--brand); font-size: 12px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.eco-card h3 { font-family: var(--font-display); font-size: 20px; }
.eco-card p { margin-top: 8px; color: var(--fg-muted); font-size: 14.5px; }
.eco-card a { display: inline-flex; gap: 6px; margin-top: 14px; color: var(--brand); font-weight: 650; font-size: 14.5px; text-decoration: none; }
.eco-card a:hover { text-decoration: underline; }

/* Footer */
footer { border-top: 1px solid var(--border); padding: 26px 0; }
.foot { display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--fg-muted); font-size: 14px; }
.foot img { height: 22px; display: block; opacity: 0.9; }

/* 404 */
.not-found { min-height: 60vh; display: flex; flex-direction: column; justify-content: center; padding: 64px 0; }
.not-found h1 { font-size: clamp(36px, 5vw, 56px); }
.not-found p { margin-top: 18px; max-width: 52ch; color: var(--fg-muted); font-size: 17px; }
.not-found .button { margin-top: 26px; align-self: flex-start; }

@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; }
  .cols { grid-template-columns: 1fr; }
  .col { border-right: none; border-bottom: 1px solid var(--border); }
  .col:last-child { border-bottom: none; }
  .eco-grid { grid-template-columns: 1fr 1fr; }
  .eco-card, .eco-card:nth-last-child(-n+2) { grid-column: span 1; }
  nav a:not(.cta) { display: none; }
}
@media (max-width: 560px) {
  .eco-grid { grid-template-columns: 1fr; }
}