:root{--bg:#07111f;--panel:#0d1a2b;--text:#eef4fb;--muted:#9aabc0;--accent:#59b8ff;--accent2:#7ee3c3;--warn:#ffd166;--danger:#ff7b7b;--line:#22364f;--shadow:0 18px 55px rgba(0,0,0,.28)}
*{box-sizing:border-box}body{margin:0;background:linear-gradient(135deg,#06101c,#0a1728 58%,#081421);color:var(--text);font:15px/1.6 Inter,Segoe UI,Arial,sans-serif}a{color:inherit;text-decoration:none}
.app{display:flex;min-height:100vh}.sidebar{width:292px;background:#06101b;border-right:1px solid var(--line);padding:22px 16px;position:fixed;inset:0 auto 0 0;overflow:auto}.brand{font-size:19px;font-weight:800;line-height:1.25}.brand span{color:var(--accent)}.brand-sub{color:var(--muted);font-size:12px;margin:5px 0 18px}.search{width:100%;background:#0b1a2c;border:1px solid var(--line);color:#fff;padding:10px 11px;border-radius:9px}.progress{height:8px;background:#122238;border-radius:99px;overflow:hidden;margin-top:12px}.bar{height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2))}.progress-text{font-size:12px;color:var(--muted);margin:5px 1px 16px}.nav-title{color:#60748d;text-transform:uppercase;letter-spacing:.12em;font-size:11px;margin:20px 10px 7px}.nav a{display:block;padding:9px 11px;border-radius:9px;color:#b8c7d8;margin:3px 0}.nav a:hover,.nav a.active{background:#10263f;color:#fff}
.main{margin-left:292px;width:calc(100% - 292px);padding:30px 38px 60px}.topbar{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:26px}.crumb{color:var(--muted);font-size:13px}.actions button{border:1px solid var(--line);background:#102136;color:#dfeaf5;padding:9px 13px;border-radius:9px;cursor:pointer}.hero{background:radial-gradient(circle at 82% 15%,rgba(89,184,255,.18),transparent 34%),linear-gradient(145deg,#102740,#0d1929);border:1px solid var(--line);border-radius:18px;padding:30px;box-shadow:var(--shadow)}
.pill{display:inline-block;padding:4px 8px;border-radius:999px;background:#113452;color:#9bd6ff;font-size:11px;margin:2px 4px 2px 0}h1{font-size:35px;line-height:1.15;margin:10px 0 12px}h2{margin-top:34px;font-size:24px}h3{margin:0 0 7px}.lead{color:#bbcadb;max-width:900px;font-size:16px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:15px;margin-top:18px}.card{background:rgba(13,26,43,.94);border:1px solid var(--line);border-radius:14px;padding:18px}.card:hover{border-color:#315273}.metric{font-size:27px;font-weight:800;margin-bottom:3px}.muted{color:var(--muted)}
.flow{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:18px 0}.step{background:#10253d;border:1px solid #2a4664;border-radius:10px;padding:10px 13px}.arrow{color:var(--accent)}.table{width:100%;border-collapse:collapse;background:#0c1929;border-radius:12px;overflow:hidden}.table th,.table td{padding:11px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.table th{background:#10243a;color:#d6e4f3}
.cmd{background:#05101c;border:1px solid #1d354d;border-radius:10px;padding:14px;overflow:auto;color:#dff2ff}.cmd code{white-space:pre}.note,.warn,.danger,.success{padding:13px 15px;border-radius:8px;margin:14px 0;background:#0f2034;border-left:4px solid var(--accent)}.warn{background:#241f0f;border-left-color:var(--warn)}.danger{background:#281418;border-left-color:var(--danger)}.success{background:#10241e;border-left-color:var(--accent2)}.check{display:flex;gap:10px;align-items:flex-start;padding:8px 0}.check input{margin-top:5px}.quiz-card{background:#0c1929;border:1px solid var(--line);border-radius:12px;padding:16px;margin:12px 0}.quiz-card button,.reveal-btn{border:1px solid var(--line);background:#132943;color:#e2edf8;border-radius:8px;padding:8px 11px;cursor:pointer;margin-top:8px}.answer{display:none;color:#a4e7cd;margin-top:10px}
.arch{display:grid;grid-template-columns:repeat(7,1fr);gap:8px;margin-top:20px}.arch .node{padding:14px 8px;border:1px solid #2b4868;background:#0f2239;border-radius:10px;text-align:center;font-size:13px}.arch .node small{display:block;color:var(--muted);margin-top:4px}.timeline{display:grid;grid-template-columns:110px 1fr;gap:10px 14px}.time{color:var(--accent);font-weight:700}.timeline .item{background:#0d1c2e;border:1px solid var(--line);border-radius:10px;padding:12px}.footer{margin-top:44px;color:#667a92;font-size:12px}
@media(max-width:1000px){.arch{grid-template-columns:repeat(2,1fr)}}@media(max-width:900px){.sidebar{position:static;width:100%;height:auto}.app{display:block}.main{margin:0;width:100%;padding:20px}.nav{display:grid;grid-template-columns:repeat(2,1fr)}}@media print{.sidebar,.actions,.search,.progress,.progress-text{display:none}.main{margin:0;width:100%;padding:10px}.hero,.card{box-shadow:none}}