:root {
  color-scheme: light dark;
  --bg: #f5f9ff;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-solid: #ffffff;
  --text: #122033;
  --muted: #556477;
  --line: rgba(28, 58, 92, 0.14);
  --blue: #1677d2;
  --blue-strong: #075aa9;
  --cyan: #24a9c6;
  --green: #137b4d;
  --orange: #d56e1f;
  --shadow: 0 18px 55px rgba(36, 73, 112, 0.14);
  --radius: 24px;
  --content: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 0%, rgba(36,169,198,.16), transparent 30rem),
    radial-gradient(circle at 95% 12%, rgba(22,119,210,.14), transparent 28rem),
    var(--bg);
  line-height: 1.58;
}

a { color: var(--blue-strong); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; height: auto; display: block; }
button, a { -webkit-tap-highlight-color: transparent; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -10rem;
  z-index: 999;
  background: var(--surface-solid);
  padding: .8rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--line);
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}
.brand img { width: 34px; height: 34px; aspect-ratio: 1 / 1; object-fit: contain; border-radius: 9px; }

.site-nav { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
.site-nav a, .language-pill {
  color: var(--muted);
  text-decoration: none;
  font-weight: 650;
  font-size: .93rem;
  padding: .55rem .72rem;
  border-radius: 999px;
}
.site-nav a[aria-current="page"] { color: var(--blue-strong); background: rgba(22,119,210,.10); }
.language-pill { border: 1px solid var(--line); margin-left: 6px; }

main { width: min(calc(100% - 32px), var(--content)); margin: 0 auto; }

.hero {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
  padding: clamp(46px, 8vw, 92px) 0 56px;
}
.hero-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(2.7rem, 7vw, 5.6rem);
  line-height: .98;
  letter-spacing: -.055em;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: .4rem .68rem;
  border-radius: 999px;
  background: rgba(19,123,77,.10);
  color: var(--green);
  font-size: .9rem;
  font-weight: 750;
}
.lead { font-size: clamp(1.08rem, 2vw, 1.32rem); color: var(--muted); max-width: 43rem; }
.hero-art {
  background: linear-gradient(145deg, rgba(22,119,210,.12), rgba(36,169,198,.08));
  border: 1px solid var(--line);
  border-radius: 36px;
  padding: clamp(14px, 3vw, 28px);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-art img { width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: contain; border-radius: 22px; }

.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: .75rem 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-solid);
  color: var(--text);
  font-weight: 750;
  text-decoration: none;
  box-shadow: 0 7px 22px rgba(30, 68, 105, .07);
}
.button.primary { background: var(--blue); border-color: var(--blue); color: white; }
.button:hover { transform: translateY(-1px); }
.button[aria-disabled="true"] { opacity: .55; cursor: not-allowed; }

.section { padding: 52px 0; }
.section + .section { border-top: 1px solid var(--line); }
.section h2 { font-size: clamp(1.7rem, 4vw, 2.65rem); letter-spacing: -.03em; margin: 0 0 12px; }
.section-intro { color: var(--muted); max-width: 48rem; margin: 0 0 26px; }

.grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 12px 36px rgba(30,68,105,.06);
}
.card h3 { margin-top: 0; margin-bottom: 8px; font-size: 1.15rem; }
.card p:last-child { margin-bottom: 0; }
.card .icon { font-size: 1.55rem; margin-bottom: 14px; }

.badges { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0 0; }
.badge { padding: .42rem .62rem; border: 1px solid var(--line); border-radius: 999px; font-size: .9rem; font-weight: 700; background: var(--surface); }

.page-head { padding: clamp(48px, 7vw, 78px) 0 34px; max-width: 790px; }
.page-head h1 { font-size: clamp(2.35rem, 6vw, 4.8rem); line-height: 1; letter-spacing: -.05em; margin: 0 0 16px; }
.page-head p { color: var(--muted); font-size: 1.15rem; }

.prose { max-width: 800px; padding-bottom: 72px; }
.prose section { padding: 24px 0; border-top: 1px solid var(--line); }
.prose h2 { font-size: 1.45rem; letter-spacing: -.02em; margin: 0 0 8px; }
.prose h3 { font-size: 1.05rem; margin-bottom: 5px; }
.prose p, .prose li { color: var(--muted); }
.prose strong { color: var(--text); }
.prose ul { padding-left: 1.25rem; }
.prose .notice, .notice {
  padding: 18px 20px;
  border-radius: 18px;
  border: 1px solid rgba(213,110,31,.26);
  background: rgba(213,110,31,.08);
  color: var(--text);
}
.prose .good, .good {
  border-color: rgba(19,123,77,.24);
  background: rgba(19,123,77,.08);
}

.kv { display: grid; grid-template-columns: minmax(150px,.4fr) 1fr; gap: 10px 22px; }
.kv dt { font-weight: 800; }
.kv dd { margin: 0; color: var(--muted); }

.support-options { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; margin: 26px 0; }
.support-option { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
.support-option .button { margin-top: auto; }

.faq details { padding: 18px 0; border-top: 1px solid var(--line); }
.faq summary { font-weight: 780; cursor: pointer; }
.faq details p { margin-bottom: 0; }

.site-footer { border-top: 1px solid var(--line); margin-top: 26px; }
.footer-wrap {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
  padding: 30px 0 44px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  font-size: .92rem;
}
.footer-links { display: flex; gap: 14px; flex-wrap: wrap; }
.footer-links a { color: var(--muted); }

.small { font-size: .9rem; color: var(--muted); }
code { background: rgba(120,130,145,.12); border-radius: 7px; padding: .14em .35em; }

@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; }
  .hero-art { max-width: 640px; }
  .grid { grid-template-columns: 1fr; }
  .support-options { grid-template-columns: 1fr; }
  .nav-wrap { align-items: flex-start; padding: 12px 0; flex-wrap: wrap; }
  .site-nav { width: 100%; margin-left: 0; justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; }
  .language-pill { margin-left: auto; }
  .kv { grid-template-columns: 1fr; }
  .kv dd { margin-bottom: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .button:hover { transform: none; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1520;
    --surface: rgba(22,33,47,.86);
    --surface-solid: #172232;
    --text: #f2f6fb;
    --muted: #b5c1cf;
    --line: rgba(214,229,244,.13);
    --blue: #3699f2;
    --blue-strong: #78bcff;
    --cyan: #5ec8df;
    --green: #63d69b;
    --orange: #ffad69;
    --shadow: 0 18px 55px rgba(0,0,0,.28);
  }
}

.language-menu { position: relative; margin-left: 6px; }
.language-menu summary { list-style: none; cursor: pointer; color: var(--muted); font-weight: 700; font-size: .93rem; padding: .55rem .72rem; border: 1px solid var(--line); border-radius: 999px; }
.language-menu summary::-webkit-details-marker { display: none; }
.language-menu-list { position: absolute; right: 0; top: calc(100% + 8px); min-width: 190px; max-height: 60vh; overflow: auto; padding: 8px; background: var(--surface-solid); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); z-index: 100; }
.language-menu-list a { display: block; padding: .55rem .7rem; border-radius: 10px; color: var(--text); text-decoration: none; white-space: nowrap; }
.language-menu-list a[aria-current="true"] { background: rgba(22,119,210,.10); color: var(--blue-strong); font-weight: 750; }
.language-menu-list a:hover { background: rgba(120,130,145,.10); }
@media (max-width: 820px) { .language-menu { margin-left: auto; } }