:root{
  --bg:#f5f5f7; --card:#fff; --ink:#1d1d1f; --muted:#6e6e73;
  --blue:#0a84ff; --blue-d:#0066cc; --line:#d2d2d7;
  --shadow:0 2px 12px rgba(0,0,0,.08);
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}
h1,h2,h3{font-weight:700;letter-spacing:-.01em}

.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 28px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.brand{display:flex;align-items:center;gap:12px}
.logo{width:38px;height:38px;border-radius:9px;background:linear-gradient(135deg,#0a84ff,#5e5ce6);color:#fff;display:grid;place-items:center;font-size:20px}
.brand h1{font-size:20px;margin:0}
.steps{display:flex;gap:4px}
.step{display:flex;align-items:center;gap:8px;padding:7px 14px;border-radius:999px;color:var(--muted);font-size:14px;font-weight:600;cursor:default}
.step .num{width:22px;height:22px;border-radius:50%;background:#e5e5ea;color:#7a7a80;display:grid;place-items:center;font-size:12px}
.step.active{color:var(--ink)}
.step.active .num{background:var(--blue);color:#fff}
.step.done{color:var(--ink)}
.step.done .num{background:#34c759;color:#fff}

#app{max-width:1080px;margin:0 auto;padding:32px 24px 60px}
.page{display:none}
.page.active{display:block}

.hero{text-align:center;margin:24px 0 36px}
.hero h2{font-size:38px;margin:0 0 10px}
.hero p{color:var(--muted);font-size:17px;margin:0}

.device-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;max-width:640px;margin:0 auto}
.device-card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:36px 24px;box-shadow:var(--shadow);cursor:pointer;transition:.15s;display:flex;flex-direction:column;align-items:center;gap:14px}
.device-card:hover{transform:translateY(-3px);border-color:var(--blue);box-shadow:0 8px 24px rgba(10,132,255,.18)}
.device-card h3{margin:0;font-size:22px}
.device-card p{margin:0;color:var(--muted)}
.device-icon{width:64px;height:104px;border-radius:14px;position:relative;background:linear-gradient(#3a3a3c,#2c2c2e)}
.device-icon::after{content:"";position:absolute;inset:5px 5px auto;height:3px;border-radius:3px;background:#1d1d1f}
.device-icon.ipad{width:84px;height:104px}

.page-head{display:flex;align-items:center;gap:16px;margin-bottom:20px}
.page-head h2{margin:0;font-size:26px}
.back{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 16px;cursor:pointer;font-size:14px;font-weight:600;color:var(--ink)}
.back:hover{background:#f0f0f2}

.search-row{margin-bottom:18px}
#model-search{width:100%;padding:12px 16px;border:1px solid var(--line);border-radius:12px;font-size:15px;background:#fff}
#model-search:focus{outline:none;border-color:var(--blue)}

.model-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.model-tile{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 12px;cursor:pointer;transition:.12s;text-align:center}
.model-tile:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:var(--shadow)}
.model-tile .mt-name{font-weight:700;font-size:15px}
.model-tile .mt-id{color:var(--muted);font-size:12px;margin-top:4px}
.model-tile .mt-count{margin-top:8px;display:inline-block;background:#eef4ff;color:var(--blue-d);font-size:12px;font-weight:600;padding:2px 8px;border-radius:999px}

.version-list{display:flex;flex-direction:column;gap:10px}
.version-row{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 20px;display:flex;align-items:center;gap:16px;cursor:pointer;transition:.12s}
.version-row:hover{border-color:var(--blue);box-shadow:var(--shadow)}
.v-status{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-weight:800;flex:none}
.v-status.open{background:#e7f7ec;color:#1e8e3e}
.v-status.signed{background:#fdecec;color:#d93025}
.v-main{flex:1;min-width:0}
.v-main .v-top{font-weight:700;font-size:16px}
.v-main .v-sub{color:var(--muted);font-size:13px;margin-top:2px}
.v-right{text-align:right;font-size:14px;color:var(--muted)}
.v-right .v-size{font-weight:700;color:var(--ink)}
.view-btn{background:#eef4ff;border:1px solid #cfe0fb;color:var(--blue-d);font-weight:700;font-size:14px;padding:9px 20px;border-radius:999px;cursor:pointer;flex:none;transition:.12s}
.view-btn:hover{background:var(--blue);border-color:var(--blue);color:#fff}

.version-cols{display:flex;gap:16px;padding:0 20px 8px;font-size:12px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
.version-cols .vc-main{flex:1}

.layout-toggle{margin-left:auto;display:flex;background:#eef0f2;border-radius:999px;padding:3px}
.layout-btn{border:none;background:transparent;padding:6px 16px;border-radius:999px;font-size:13px;font-weight:700;color:var(--muted);cursor:pointer}
.layout-btn.active{background:#fff;color:var(--ink);box-shadow:0 1px 4px rgba(0,0,0,.15)}

.model-grid.layout-list{display:flex;flex-direction:column;gap:8px}
.model-grid.layout-list .model-tile{display:flex;align-items:center;justify-content:space-between;text-align:left;padding:14px 20px;border-radius:12px}
.model-grid.layout-list .model-tile .mt-id{margin-top:0;margin-left:auto;margin-right:12px}
.model-grid.layout-list .model-tile .mt-count{margin-top:0}

.download-card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:30px;box-shadow:var(--shadow);max-width:640px}
.dl-row{display:flex;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--line)}
.dl-row:last-of-type{border-bottom:none}
.dl-row .k{color:var(--muted)}
.dl-row .v{font-weight:600}
.dl-btn{display:block;width:100%;margin-top:22px;background:var(--blue);color:#fff;text-align:center;font-size:17px;font-weight:700;padding:15px;border-radius:14px;text-decoration:none;transition:.12s}
.dl-btn:hover{background:var(--blue-d)}

.howto{margin-top:24px;background:#f5f5f7;border:1px solid var(--line);border-radius:14px;padding:18px 20px}
.howto h4{margin:0 0 10px;font-size:15px}
.howto ol{margin:0;padding-left:20px;color:#3c3c41;font-size:14px;line-height:1.7}
.dfu-chip{margin-top:12px;font-size:13px;color:var(--muted);background:#fff;border:1px dashed var(--line);border-radius:10px;padding:10px 12px}
.empty{color:var(--muted);padding:40px;text-align:center}

.foot{text-align:center;color:var(--muted);font-size:13px;padding:24px;border-top:1px solid var(--line)}
.foot .src{font-size:12px;margin-top:4px}

@media(max-width:600px){.device-cards{grid-template-columns:1fr}.hero h2{font-size:28px}.steps .step span:not(.num){display:none}}