:root {
  --bg: #ffffff;
  --bg-alt: #f4f4f2;
  --surface: #ffffff;
  --text: #121212;
  --muted: #5f5f5c;
  --line: #e2e2de;
  --brand: #121212;
  --brand-text: #ffffff;
  --accent: #1f8a4c;
  --accent-soft: #e7f4ec;
  --warn: #9a5b00;
  --warn-soft: #fff4e0;
  --error: #b3261e;
  --error-soft: #fdecea;
  --info-soft: #eef1f6;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 8px 24px rgba(0, 0, 0, .06);
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111111;
    --bg-alt: #181817;
    --surface: #1e1e1d;
    --text: #f1f1ee;
    --muted: #a5a5a0;
    --line: #2e2e2c;
    --brand: #f1f1ee;
    --brand-text: #111111;
    --accent: #4cc27f;
    --accent-soft: #15301f;
    --warn: #f0b24a;
    --warn-soft: #33270f;
    --error: #ff8a80;
    --error-soft: #3a1714;
    --info-soft: #1f2530;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .3);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 var(--font);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); font-weight: 750; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 650; }
h4 { font-size: .95rem; font-weight: 650; }
p { margin: 0 0 1em; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }

/* top bar */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: inline-flex; align-items: center; text-decoration: none; color: var(--text); }
.brand-logo { height: 24px; width: auto; display: block; }
.topnav { display: flex; gap: 20px; margin-left: auto; }
.topnav a { text-decoration: none; color: var(--muted); font-weight: 500; font-size: .95rem; }
.topnav a:hover { color: var(--text); }
.lang { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; padding: 2px; }
.lang button {
  border: 0; background: transparent; color: var(--muted); font: inherit; font-size: .8rem; font-weight: 650;
  padding: 4px 10px; border-radius: 999px; cursor: pointer;
}
.lang button[aria-pressed="true"] { background: var(--brand); color: var(--brand-text); }

/* hero */
.hero { padding: 48px 0 32px; }
.hero-inner { display: grid; grid-template-columns: 1.1fr .9fr; gap: 32px; align-items: center; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .78rem; font-weight: 700; color: var(--muted); margin-bottom: .75em; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 34em; }
.hero-meta { margin: 20px 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
/* The render has a white background: multiply blends it into the light page. */
.hero-image img { width: 100%; max-width: 440px; margin-left: auto; mix-blend-mode: multiply; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .hero-image img { border-radius: 24px; mix-blend-mode: normal; }
}

.pill { display: inline-flex; gap: 6px; align-items: center; padding: 6px 12px; border-radius: 999px; font-size: .9rem; background: var(--accent-soft); color: var(--accent); }
.pill strong { color: var(--text); }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-weight: 600; font-size: .98rem; line-height: 1;
  padding: 13px 20px; border-radius: 10px; border: 1px solid transparent;
  cursor: pointer; text-decoration: none; transition: transform .05s, background .15s, opacity .15s;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .4; cursor: not-allowed; transform: none; }
.btn-primary { background: var(--brand); color: var(--brand-text); }
.btn-primary:not(:disabled):hover { opacity: .88; }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--line); }
.btn-secondary:hover { border-color: var(--text); }
.btn-chosen { background: var(--accent-soft); color: var(--accent); border-color: transparent; cursor: default; }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--text); }
.btn-link { background: none; border: 0; padding: 8px 4px; color: var(--muted); text-decoration: underline; text-underline-offset: 3px; font-weight: 500; }
.btn-link:hover { color: var(--text); }
:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 60%, transparent); outline-offset: 2px; }

/* sections */
.section { padding: 56px 0; }
.section-alt { background: var(--bg-alt); }
.section-lead { color: var(--muted); max-width: 44em; margin-bottom: 28px; }

/* releases */
.release-list { display: grid; gap: 20px; }
.release {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
.release.is-chosen { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), var(--shadow); }
.release-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px 16px; margin-bottom: 8px; }
.release-head p { margin: 0; }
.release-title { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.release-title h3 { margin: 0; font-size: 1.35rem; }
.badges { display: flex; gap: 6px; }
.badge { font-size: .72rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; padding: 4px 8px; border-radius: 6px; }
.badge-current { background: var(--accent-soft); color: var(--accent); }
.badge-older { background: var(--bg-alt); color: var(--muted); }
.release-summary { font-size: 1.05rem; }
.recommend { background: var(--bg-alt); border-radius: 10px; padding: 14px 16px; margin: 16px 0; }
.recommend h4 { margin-bottom: .35em; }
.recommend p { margin: 0; color: var(--muted); }
.recommend-critical { background: var(--warn-soft); }
.changes { margin: 12px 0 4px; }
.changes > summary { cursor: pointer; font-weight: 650; padding: 6px 0; list-style-position: inside; }
.change-list { list-style: none; padding: 0; margin: 8px 0 0; display: grid; gap: 10px; }
.change { display: grid; grid-template-columns: 92px 1fr; gap: 12px; align-items: start; }
.change-type { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; padding: 3px 8px; border-radius: 6px; text-align: center; margin-top: 2px; }
.change-new .change-type { background: var(--accent-soft); color: var(--accent); }
.change-improved .change-type { background: var(--info-soft); color: var(--text); }
.change-fixed .change-type { background: var(--bg-alt); color: var(--muted); border: 1px solid var(--line); }
.change-security .change-type { background: var(--warn-soft); color: var(--warn); }
.release-foot { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line); }

/* steps */
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }
.step {
  display: grid; grid-template-columns: 44px 1fr; gap: 16px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px;
}
.step-num {
  width: 36px; height: 36px; border-radius: 50%; background: var(--brand); color: var(--brand-text);
  display: grid; place-items: center; font-weight: 700;
}
.step-body > :last-child { margin-bottom: 0; }
.step-split { display: grid; grid-template-columns: 1fr 300px; gap: 24px; align-items: start; }
.checklist { margin: 0 0 1em; padding-left: 1.2em; }
.checklist li { margin: .3em 0; }
.howto { margin: 0 0 1em; padding-left: 1.3em; }
.howto li { margin: .45em 0; padding-left: .2em; }
.anim { margin: 0; text-align: center; }
.anim img { width: 100%; max-width: 300px; margin: 0 auto; border-radius: 12px; background: #fff; border: 1px solid var(--line); }
.anim figcaption { font-size: .85rem; color: var(--muted); margin-top: 8px; }
.chosen { display: flex; align-items: center; flex-wrap: wrap; gap: 4px 8px; padding: 12px 14px; background: var(--bg-alt); border-radius: 10px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; margin: 12px 0; }
.check { display: flex; gap: 10px; align-items: flex-start; margin: 10px 0; cursor: pointer; }
.check input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--brand); }

.status { border-radius: 10px; padding: 12px 14px; margin-top: 12px; font-weight: 500; }
.status-info { background: var(--info-soft); }
.status-ok { background: var(--accent-soft); color: var(--accent); }
.status-warn { background: var(--warn-soft); color: var(--warn); }
.status-error { background: var(--error-soft); color: var(--error); }

.device { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 14px 0 0; }
.device div { background: var(--bg-alt); border-radius: 10px; padding: 10px 12px; min-width: 0; }
.device dt { font-size: .75rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); font-weight: 650; }
.device dd { margin: 2px 0 0; font-weight: 650; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }

.progress { display: flex; align-items: center; gap: 12px; margin-top: 12px; }
.progress-bar { flex: 1; height: 10px; border-radius: 999px; background: var(--bg-alt); overflow: hidden; border: 1px solid var(--line); }
.progress-bar span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.progress-text { font-variant-numeric: tabular-nums; font-weight: 650; min-width: 3.5em; text-align: right; }

.notice { border-radius: 10px; padding: 14px 16px; margin-bottom: 16px; }
.notice strong { display: block; margin-bottom: 4px; }
.notice-warn { background: var(--warn-soft); color: var(--warn); }

.log { margin-top: 20px; }
.log summary { cursor: pointer; color: var(--muted); font-size: .9rem; }
.log pre {
  max-height: 260px; overflow: auto; background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
  padding: 12px; font: 12px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; white-space: pre-wrap; word-break: break-all;
}

/* help */
.faq { display: grid; gap: 10px; max-width: 820px; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 4px 18px; }
.faq summary { cursor: pointer; font-weight: 600; padding: 12px 0; }
.faq details p { color: var(--muted); }
.contact { margin-top: 24px; color: var(--muted); }

.footer { border-top: 1px solid var(--line); padding: 24px 0; font-size: .85rem; color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-image { order: -1; }
  .hero-image img { max-width: 260px; margin: 0 auto; }
  .step-split { grid-template-columns: 1fr; }
  .anim img { max-width: 260px; }
}
@media (max-width: 600px) {
  .topnav { display: none; }
  .lang { margin-left: auto; }
  .hero { padding-top: 24px; }
  .step { grid-template-columns: 1fr; padding: 18px; }
  .release { padding: 18px; }
  .change { grid-template-columns: 1fr; gap: 4px; }
  .change-type { justify-self: start; }
  .device { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}