:root{--bg:#071014;--panel:#0c171c;--line:rgba(255,255,255,.09);--text:#f4f7f8;--muted:#8fa0a8;--accent:#59d7ff;--accent2:#b8f1ff;--ok:#66dfa1;--bad:#ff8e8e;--warn:#ffd47a;--shadow:0 34px 90px rgba(0,0,0,.42)}*{box-sizing:border-box}html{background:var(--bg)}body{margin:0;min-height:100vh;background:radial-gradient(circle at 50% -20%,rgba(89,215,255,.14),transparent 42%),linear-gradient(180deg,#071014 0%,#091216 100%);color:var(--text);font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.installer-shell{width:min(1080px,calc(100% - 32px));margin:0 auto;padding:28px 0 48px}.installer-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.brand{color:#fff;text-decoration:none;font-weight:850;letter-spacing:.18em;font-size:18px}.brand span{color:var(--accent);font-weight:650}.secure-pill{border:1px solid var(--line);border-radius:999px;padding:8px 12px;color:var(--muted);font-size:12px;background:rgba(255,255,255,.025)}.installer-card{background:linear-gradient(180deg,rgba(17,30,36,.96),rgba(10,20,24,.98));border:1px solid var(--line);box-shadow:var(--shadow);border-radius:28px;overflow:hidden}.progress{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line);background:rgba(255,255,255,.018)}.progress-item{padding:18px 22px;display:flex;align-items:center;gap:10px;color:#647780;border-right:1px solid var(--line)}.progress-item:last-child{border-right:0}.progress-item span{display:grid;place-items:center;width:28px;height:28px;border:1px solid rgba(255,255,255,.12);border-radius:50%;font-size:12px}.progress-item b{font-size:13px}.progress-item.is-active{color:#dce9ee}.progress-item.is-active span{border-color:rgba(89,215,255,.4);background:rgba(89,215,255,.08);color:var(--accent)}.progress-item.is-done span{background:var(--accent);color:#061115;border-color:var(--accent)}section{padding:52px 58px 58px;max-width:860px;margin:0 auto}.eyebrow{margin:0 0 12px;color:var(--accent);font-size:11px;font-weight:800;letter-spacing:.16em}.installer-card h1{font-size:clamp(30px,5vw,46px);line-height:1.08;margin:0 0 14px;letter-spacing:-.04em}.lead{margin:0 0 32px;color:var(--muted);line-height:1.75;font-size:15px}.alert{margin:28px auto 0;width:calc(100% - 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