:root {
  color-scheme: light;
  --ink: #122833;
  --muted: #526872;
  --surface: #ffffff;
  --soft: #eef5f4;
  --line: #d6e2df;
  --brand: #102f3f;
  --accent: #d6a84b;
  --accent-dark: #8a650e;
  --success: #15603f;
  --radius: 18px;
  --shadow: 0 18px 50px rgba(16, 47, 63, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: "Tahoma", "Arial", sans-serif;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
.shell { width: min(1120px, calc(100% - 32px)); margin-inline: auto; }
.skip-link { position: fixed; inset-block-start: 8px; inset-inline-start: 8px; z-index: 100; padding: 10px 16px; background: white; color: var(--brand); border: 2px solid var(--brand); border-radius: 8px; transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.site-header { border-bottom: 1px solid var(--line); background: rgba(255,255,255,.96); }
.brand-row { min-height: 84px; display: flex; align-items: center; gap: 12px; }
.brand-icon { border-radius: 14px; box-shadow: 0 6px 18px rgba(16,47,63,.14); }
.brand-name { margin: 0; color: var(--brand); font-size: 1.35rem; font-weight: 800; letter-spacing: .04em; }
.brand-subtitle { margin: -4px 0 0; color: var(--muted); font-size: .85rem; }
.hero { padding-block: clamp(48px, 8vw, 92px); display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(280px, .65fr); gap: clamp(32px, 7vw, 84px); align-items: center; }
.eyebrow { margin: 0 0 8px; color: var(--accent-dark); font-size: .88rem; font-weight: 800; letter-spacing: .02em; }
h1, h2, h3 { color: var(--brand); line-height: 1.3; text-wrap: balance; }
h1 { margin: 0; font-size: clamp(2.1rem, 6vw, 4rem); max-width: 16ch; }
h2 { margin: 0; font-size: clamp(1.65rem, 4vw, 2.5rem); }
h3 { margin: 0 0 8px; font-size: 1.12rem; }
.lead { max-width: 62ch; margin: 20px 0 28px; color: var(--muted); font-size: clamp(1rem, 2vw, 1.15rem); }
.download-button { min-height: 52px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 12px 22px; background: var(--brand); color: #fff; border-radius: 12px; text-decoration: none; font-weight: 800; box-shadow: 0 12px 30px rgba(16,47,63,.22); transition: transform .18s ease, background .18s ease; }
.download-button:hover { background: #18465d; transform: translateY(-1px); }
.download-button:focus-visible, summary:focus-visible, .skip-link:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.download-mark { font-size: 1.3rem; line-height: 1; }
.download-note { margin: 12px 0 0; color: var(--muted); font-size: .88rem; }
.release-card { padding: 26px; background: var(--soft); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.release-card > img { margin: 0 auto 24px; border-radius: 28px; box-shadow: 0 10px 26px rgba(16,47,63,.18); }
dl { margin: 0; }
.release-card dl { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.release-card dl div { padding: 12px; background: white; border-radius: 12px; }
dt { color: var(--muted); font-size: .8rem; }
dd { margin: 2px 0 0; font-weight: 800; overflow-wrap: anywhere; }
.status { color: var(--success); }
.section { padding-block: clamp(48px, 7vw, 78px); }
.section-heading { margin-bottom: 28px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feature-grid article { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: white; }
.feature-grid p, .architecture-note, .trust p { margin: 0; color: var(--muted); }
.architecture-note { margin-top: 24px; padding: 18px 20px; border-inline-start: 4px solid var(--accent); background: #fbf8ee; border-radius: 10px; }
.steps-section { background: var(--brand); color: white; }
.steps-section h2, .steps-section .eyebrow { color: white; }
.steps { margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; list-style: none; }
.steps li { padding: 20px; border: 1px solid rgba(255,255,255,.22); border-radius: var(--radius); background: rgba(255,255,255,.07); }
.steps li span { width: 34px; height: 34px; display: grid; place-items: center; margin-bottom: 14px; border-radius: 50%; background: var(--accent); color: #172a32; font-weight: 900; }
.steps p { margin: 0; }
.trust { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
details { border: 1px solid var(--line); border-radius: var(--radius); background: var(--soft); }
summary { min-height: 52px; display: flex; align-items: center; padding: 14px 18px; cursor: pointer; color: var(--brand); font-weight: 800; }
.technical-details { padding: 0 18px 18px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.technical-details div { padding: 12px; background: white; border-radius: 10px; min-width: 0; }
.technical-details .full { grid-column: 1 / -1; }
.technical-details dd[dir="ltr"] { font-family: Consolas, monospace; font-size: .76rem; text-align: left; }
.site-footer { padding-block: 26px; background: #0b222d; color: #dce7e9; }
.site-footer .shell { display: flex; justify-content: space-between; gap: 16px; }
.site-footer p { margin: 0; font-size: .88rem; }

@media (max-width: 860px) {
  .hero, .trust { grid-template-columns: 1fr; }
  .release-card { max-width: 520px; }
  .feature-grid, .steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .shell { width: min(100% - 24px, 1120px); }
  .hero { padding-block: 42px; gap: 32px; }
  h1 { font-size: clamp(2rem, 11vw, 2.65rem); }
  .download-button { width: 100%; }
  .release-card { padding: 20px; }
  .release-card dl, .feature-grid, .steps, .technical-details { grid-template-columns: 1fr; }
  .technical-details .full { grid-column: auto; }
  .site-footer .shell { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}