:root{color-scheme:light dark;--bg:#f5f7fb;--surface:#fff;--text:#172338;--muted:#65748b;--line:#e5eaf2;--accent:#246fe5;--soft:#edf3ff}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:5px}.download-shell{width:100%;max-width:500px;margin:auto;padding:0 22px}.topbar{height:78px;display:flex;align-items:center;justify-content:space-between}.brand{font-size:20px;font-weight:750;letter-spacing:-.6px;color:var(--text)}.sign-in{font-size:14px;min-height:48px;display:flex;align-items:center}main{padding:18px 0 26px}.install-card{padding:28px;background:var(--surface);border:1px solid var(--line);border-radius:24px;box-shadow:0 8px 32px #14213505}.app-heading{display:flex;align-items:center;gap:16px}.app-icon{flex-shrink:0;width:64px;height:64px;border-radius:18px}.platform{font-size:9px;letter-spacing:.1em;color:var(--muted);margin:0;font-weight:650}h1{font-size:29px;line-height:1.2;letter-spacing:-1px;margin:4px 0}.version{font-size:12px;color:var(--muted);margin:0}.description{color:var(--muted);margin:24px 0 16px;line-height:1.75}.features{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:26px}.features span{padding:5px 9px;background:var(--soft);border-radius:8px;font-size:10px;color:var(--accent)}.download-button{display:flex;align-items:center;justify-content:center;gap:10px;min-height:56px;width:100%;padding:14px 18px;border-radius:14px;background:var(--accent);color:#fff;font-size:16px;font-weight:650;box-shadow:0 4px 12px #246fe522}.download-button:hover{text-decoration:none;filter:brightness(1.07)}.download-button svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.download-note{margin:12px 0 0;text-align:center;font-size:11px;color:var(--muted)}h2{margin:0 0 22px;font-size:19px;letter-spacing:-.4px}.how-to{padding:32px 6px 12px}.how-to ol{list-style:none;padding:0;margin:0}.how-to li{display:flex;gap:14px;margin-bottom:22px}.step{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:30px;height:30px;margin-top:2px;border:1px solid var(--line);border-radius:10px;color:var(--accent);font-size:13px;font-weight:650;background:var(--surface)}.how-to strong{font-size:14px;font-weight:650}.how-to p{font-size:13px;color:var(--muted);margin:4px 0 0;line-height:1.7}.download-help{border:1px solid var(--line);border-radius:14px;background:var(--surface)}.download-help summary{padding:15px 18px;cursor:pointer;min-height:52px;font-size:13px;font-weight:600}.download-help>div{padding:0 18px 10px;font-size:13px;color:var(--muted)}.download-help p{margin:0 0 12px}footer{border-top:1px solid var(--line);padding:22px 0 30px;display:flex;gap:14px;justify-content:space-between;color:var(--muted);font-size:11px}.unavailable{color:var(--muted);padding:16px;background:var(--soft);border-radius:14px}
@media(prefers-color-scheme:dark){:root{--bg:#0e1520;--surface:#151f2d;--text:#f2f5fb;--muted:#a1afc1;--line:#29374a;--accent:#76b7ff;--soft:#202e42}.download-button{background:#76b7ff;color:#102542;box-shadow:none}}
@media(max-width:360px){.download-shell{padding:0 16px}.install-card{padding:22px}.app-heading{gap:12px}.app-icon{width:52px;height:52px}h1{font-size:27px}.platform{font-size:8px}}