:root {
  --bg: #111214; --raised: #191b1e; --border: #2a2d31; --text: #e8eaed; --muted: #9aa1a9;
  --accent: #19d3b4; --accent-ink: #062b25; --sky: #5ab8ff;
  --gutter: clamp(16px, 5vw, 56px);
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: light) {
  :root { --bg: #f6f7f8; --raised: #ffffff; --border: #dde1e5; --text: #15171a; --muted: #5d6670;
          --accent: #0fa58c; --accent-ink: #ffffff; --sky: #1f7fd1; }
}
* { box-sizing: border-box; }
/* Android (Samsung Internet, Chrome) inflates text it thinks is too small; keep our sizes. */
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: 72px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 var(--sans); overflow-wrap: break-word; }
a { color: var(--sky); }
button { font: inherit; color: inherit; }

/* header */
.top { display: flex; justify-content: space-between; align-items: center; gap: 12px;
       padding: 12px var(--gutter); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10;
       background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(8px); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); text-decoration: none; flex: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.top-actions { display: flex; align-items: center; gap: 18px; }
.menu { display: flex; align-items: center; gap: 18px; }
.menu a { color: var(--text); text-decoration: none; font-size: 15px; white-space: nowrap; }
.lang { background: transparent; border: 1px solid var(--border); border-radius: 8px; padding: 4px 10px; cursor: pointer; }
.menu-toggle { display: none; background: transparent; border: 1px solid var(--border); border-radius: 8px;
               width: 40px; height: 36px; padding: 0; cursor: pointer; flex-direction: column; align-items: center;
               justify-content: center; gap: 4px; }
.menu-toggle span { display: block; width: 18px; height: 2px; border-radius: 2px; background: var(--text); transition: transform .2s, opacity .2s; }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* content */
main { max-width: 980px; margin: 0 auto; padding: 0 var(--gutter); }
.hero { text-align: center; padding: 72px 0 52px; }
.hero h1 { font-size: clamp(28px, 6vw, 46px); line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.01em; }
.lead { font-size: clamp(16px, 2.4vw, 19px); color: var(--muted); max-width: 680px; margin: 0 auto 28px; }
.cta { display: inline-block; background: var(--accent); color: var(--accent-ink); font-weight: 700; padding: 12px 24px;
       border-radius: 10px; text-decoration: none; }
.block { padding: 48px 0; border-top: 1px solid var(--border); }
.block h2 { font-size: clamp(22px, 4vw, 28px); margin: 0 0 20px; }
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.tab { background: var(--raised); border: 1px solid var(--border); border-radius: 8px; padding: 8px 14px; cursor: pointer; }
.tab.active { border-color: var(--accent); color: var(--accent); }
.pane { display: none; } .pane.active { display: block; }
.cmd { display: flex; gap: 10px; align-items: center; background: var(--raised); border: 1px solid var(--border);
       border-radius: 10px; padding: 12px 14px; margin: 12px 0; }
.cmd code { flex: 1; min-width: 0; font: 14px/1.5 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; }
.copy { flex: none; background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 8px; padding: 6px 12px;
        cursor: pointer; font-weight: 600; }
.muted { color: var(--muted); font-size: 15px; }
.steps { padding-left: 22px; } .steps li { margin: 8px 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); gap: 16px; }
.grid article { background: var(--raised); border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px; }
.grid h3 { margin: 0 0 8px; font-size: 18px; color: var(--accent); }
.grid p { margin: 0; color: var(--muted); }
.checks { list-style: none; padding: 0; margin: 0; } .checks li { padding: 8px 0 8px 30px; position: relative; }
.checks li::before { content: "✓"; position: absolute; left: 4px; color: var(--accent); font-weight: 700; }
details { background: var(--raised); border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 600; } details p { color: var(--muted); margin: 10px 0 0; }
.foot { text-align: center; color: var(--muted); padding: 32px var(--gutter); border-top: 1px solid var(--border); font-size: 14px; }

/* phones and narrow tablets */
@media (max-width: 760px) {
  .top-actions { gap: 8px; }
  .menu-toggle { display: flex; }
  .menu { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: stretch;
          gap: 0; padding: 6px var(--gutter) 12px; background: var(--bg); border-bottom: 1px solid var(--border); }
  .menu.open { display: flex; }
  .menu a { padding: 12px 0; font-size: 17px; border-bottom: 1px solid var(--border); }
  .menu a:last-child { border-bottom: 0; }
  .hero { padding: 40px 0 36px; text-align: left; }
  .lead { margin-left: 0; }
  .cta { display: block; text-align: center; }
  .block { padding: 36px 0; }
  .tabs { display: grid; grid-template-columns: repeat(3, 1fr); }
  .tab { padding: 8px 6px; text-align: center; }
  .cmd { flex-direction: column; align-items: stretch; }
  .cmd code { font-size: 13px; }
  .copy { padding: 9px 12px; }
  .grid article { padding: 16px; }
  details { padding: 12px 14px; }
}