:root{--bg:#071522;--p:#0d2439;--p2:#102d47;--line:#244d6c;--text:#f5f9ff;--muted:#a8bfd1;--blue:#66c7ff;--green:#79d9a7;--red:#ef8a92;--amber:#f5d56f}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:linear-gradient(#071522,#06101c);color:var(--text);font:15px system-ui,-apple-system,Segoe UI,sans-serif;min-height:100vh}
button,input,select{font:inherit}.top{position:sticky;top:0;z-index:9;background:#071522f2;border-bottom:1px solid #173a54;display:flex;justify-content:space-between;align-items:center;padding:12px 15px;backdrop-filter:blur(14px)}
.brand{font-weight:900;font-size:18px;cursor:pointer}.menu{position:relative}.mb{background:#0e2942;color:#fff;border:1px solid #2d5879;border-radius:12px;width:43px;height:43px;font-size:21px;cursor:pointer}
.drop{display:none;position:absolute;right:0;top:49px;width:250px;background:#0a1e31;border:1px solid var(--line);border-radius:14px;padding:7px;box-shadow:0 18px 45px #0008}.drop.on{display:block}
.drop button{display:block;width:100%;border:0;background:none;color:#e8f4ff;text-align:left;padding:11px;border-radius:9px;font-weight:700;cursor:pointer}.drop button:hover{background:#143552}
.wrap{max-width:1080px;margin:auto;padding:18px 12px 70px}.view{display:none}.view.on{display:block}.card{background:linear-gradient(#102a43,#0b2034);border:1px solid #214b69;border-radius:17px}
.hero{padding:23px}.hero h1{font-size:clamp(32px,7vw,50px);margin:5px 0 10px;line-height:1.04}.muted{color:var(--muted)}.tag{color:#83d1ff;font-size:11px;font-weight:900;letter-spacing:.8px;text-transform:uppercase}
.stats{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.stat{background:#081b2b;border:1px solid #28506f;border-radius:10px;padding:8px 10px}
.section{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:22px 2px 10px}.section h2{margin:0}.mini{font-size:12px}
.quick,.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.tile{padding:16px;cursor:pointer;min-height:145px}.tile .ico{font-size:30px}.tile h3{margin:8px 0 5px}.tile p{margin:0;color:var(--muted);font-size:13px}
.search,input,select{width:100%;padding:12px;border-radius:11px;border:1px solid #2b5576;background:#071b2d;color:#fff}.group{margin:9px 0;border:1px solid #214967;border-radius:14px;background:#0a1f33;overflow:hidden}
.group summary{padding:14px 15px;font-weight:900;cursor:pointer}.row{display:flex;gap:12px;align-items:center;padding:12px;cursor:pointer}.row:hover{background:#12314d}.ri{font-size:27px;width:38px}
.row h3{margin:0 0 3px;font-size:16px}.row p{margin:0;color:var(--muted);font-size:12px}.back{border:0;background:none;color:#a9dcff;font-weight:800;padding:0 0 12px;cursor:pointer}
.head{padding:20px;margin-bottom:11px}.head h1{margin:5px 0}.mods{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.mod{padding:16px;cursor:pointer;position:relative}.mod h3{margin:4px 0 8px}.mod:hover,.tile:hover{border-color:#39759c;transform:translateY(-1px)}
.progress{height:8px;background:#061522;border:1px solid #214866;border-radius:99px;overflow:hidden}.progress i{display:block;height:100%;background:#67c5ff;transition:width .2s}
.source-pill{display:inline-flex;align-items:center;gap:6px;padding:5px 8px;border-radius:99px;background:#081b2b;border:1px solid #2b5576;color:#bfe6ff;font-size:11px;font-weight:800}
.lesson-shell{display:grid;gap:11px}.lesson-head{padding:22px}.lesson-head h1{font-size:clamp(28px,6vw,40px);margin:6px 0 10px}.lesson-head p{line-height:1.6}
.lesson-section{padding:18px 20px}.lesson-section h2{margin:2px 0 8px;font-size:20px}.lesson-section p{line-height:1.72;color:#d8e5ef;margin:0}
.source-box{padding:14px 16px}.source-box a{color:#8ed7ff;text-decoration:none}.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.btn{border:0;border-radius:10px;padding:11px 14px;font-weight:850;cursor:pointer;background:#67c5ff;color:#041321}.btn2{background:#112d47;color:#dcefff;border:1px solid #2b5778}.btn:disabled{opacity:.5;cursor:not-allowed}
.test-card{padding:18px;margin-top:14px;border-color:#3a6786}.test-card h3{margin:4px 0 6px}.test-card .bigline{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.continue{margin-top:12px;padding:15px 17px;display:flex;align-items:center;justify-content:space-between;gap:12px}.continue h3{margin:2px 0}.continue p{margin:0}
.question{padding:17px;margin:10px 0}.question h3{margin:0 0 12px;font-size:17px;line-height:1.4}.qnum{color:#83d1ff;font-size:11px;font-weight:900;margin-bottom:5px}.quizopt{display:block;width:100%;padding:11px 12px;margin:7px 0;text-align:left;border-radius:10px;border:1px solid #2a5575;background:#092139;color:#fff;cursor:pointer}
.quizopt:hover{border-color:#4e8cb4}.quizopt.selected{background:#153959;border-color:#70c9ff}.quizopt.ok{background:#123b2d;border-color:#56bd8c}.quizopt.no{background:#3b191e;border-color:#d16b73}
.feedback{margin-top:8px;padding:10px 12px;border-radius:9px;background:#081b2b;border:1px solid #234b69;color:#cde1ef;line-height:1.5}.score{font-size:46px;font-weight:950;color:#76ceff}.score.good{color:var(--green)}.score.bad{color:var(--red)}
.result{padding:20px;margin-bottom:12px}.result h2{margin:3px 0}.ebooks{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.book{padding:15px}.book h3{margin:5px 0 8px}.book a{color:#8ed7ff}
.account{display:grid;grid-template-columns:1.2fr .8fr;gap:10px}.acc{padding:18px}.field{margin:12px 0}.field label{display:block;margin-bottom:5px;color:#bdd0df;font-size:12px;font-weight:800}.big{font-size:48px;color:#76ceff;font-weight:950}
.legal-mini{font-size:11px;line-height:1.45;color:#7894aa;background:#071725;border:1px solid #183951;border-radius:9px;padding:8px 10px;margin-top:10px}.home-legal{margin-top:24px}.badge-pass{color:#9ce5bd}.badge-test{color:#ffe792}
hr.sep{border:0;border-top:1px solid #214967;margin:16px 0}
@media(max-width:800px){.quick,.grid{grid-template-columns:repeat(2,1fr)}.mods,.ebooks,.account{grid-template-columns:1fr}}
@media(max-width:430px){.quick,.grid{grid-template-columns:1fr}.wrap{padding:13px 10px 60px}.hero{padding:19px}.lesson-head,.lesson-section{padding:17px}.continue{align-items:flex-start;flex-direction:column}.btn{width:100%}}
.visual-study{padding:18px;overflow:hidden}.visual-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.visual-head h2{margin:4px 0 6px}.safe-pill{font-size:12px;color:#9fc0d6;border:1px solid #2b5673;background:#081b2b;border-radius:999px;padding:6px 9px;white-space:nowrap}.faa-viz{background:#06131f;border:1px solid #244d6c;border-radius:15px;padding:9px;margin-top:12px;overflow:hidden}.faa-viz svg{width:100%;height:auto;display:block}.viz-note,.viz-source{font-size:12px;color:#8fb1c9}.scenario{margin-top:14px;padding:14px;border:1px solid #244d6c;border-radius:14px;background:#0a2032}.scenario h3{margin:5px 0 10px}.scenario-options{display:grid;gap:8px}.scenario-option{background:#0b1c2b;border:1px solid #315b78;color:#edf8ff;padding:11px;border-radius:11px;text-align:left;font-weight:700;cursor:pointer}.scenario-option.good{border-color:#79d9a7;background:#103729}.scenario-option.bad{border-color:#ef8a92;background:#3a171c}.scenario-result{display:none;margin-top:10px;padding:10px;border-radius:10px;background:#071826;color:#d8ebf7}.scenario-result.on{display:block}.systems-lab{position:fixed;inset:0;z-index:100;background:#02070cdd;display:none;align-items:flex-start;justify-content:center;padding:16px;overflow:auto}.systems-lab.on{display:flex}.lab-shell{width:min(100%,980px);background:#071522;border:1px solid #2b5877;border-radius:18px;box-shadow:0 24px 70px #000a;overflow:hidden}.lab-top{position:sticky;top:0;background:#0a1d2d;z-index:2;padding:13px 15px;border-bottom:1px solid #244d6c;display:flex;justify-content:space-between;align-items:center}.lab-top h2{margin:0}.lab-close,.lab-tab{border:1px solid #315b78;background:#0b2235;color:#fff;border-radius:10px;padding:8px 10px;cursor:pointer;font-weight:800}.lab-tabs{display:flex;gap:7px;overflow:auto;padding:10px 12px;border-bottom:1px solid #244d6c}.lab-tab{white-space:nowrap;border-radius:999px}.lab-tab.on{border-color:#6dc7ff;background:#173b57}.lab-body{padding:14px}.lab-grid{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(240px,.55fr);gap:14px}.lab-info{background:#0a1d2d;border:1px solid #244d6c;border-radius:14px;padding:14px;min-height:150px}.hot{cursor:pointer}.hot:hover{opacity:.8}.lab-card{margin-top:10px;background:#0a2032;border:1px solid #244d6c;border-radius:12px;padding:10px}.lab-card b{display:block;margin-bottom:4px}.svg-title{font-size:16px;font-weight:900;fill:#f6fbff}.svg-label{font-size:12px;font-weight:800;fill:#e8f5ff}.svg-muted{font-size:11px;fill:#9fc0d6}@media(max-width:720px){.visual-head{display:block}.safe-pill{display:inline-block;margin-top:8px}.lab-grid{grid-template-columns:1fr}.systems-lab{padding:7px}}.mastery-depth{margin-top:10px;display:inline-block;font-size:12px;font-weight:800;color:#9fd0ee;background:#0a2235;border:1px solid #285773;border-radius:999px;padding:6px 9px}.q h3{line-height:1.45}.opt{line-height:1.35}.explain{line-height:1.5}.card.lesson-section p{line-height:1.68}
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.labplus-home{margin-top:26px;padding:20px;border:1px solid #285d7b;border-radius:22px;background:linear-gradient(180deg,#0c263a,#081a28);box-shadow:0 18px 50px #0005}.labplus-head{display:flex;justify-content:space-between;gap:14px;align-items:flex-end}.labplus-head h2{margin:5px 0;font-size:clamp(26px,5vw,38px)}.labplus-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px;margin-top:16px}.labplus-card{border:1px solid #2b6385;background:linear-gradient(145deg,#102f47,#0b2234);border-radius:17px;padding:15px;text-align:left;color:#eef8ff;cursor:pointer;min-height:128px;box-shadow:inset 0 1px #ffffff0d}.labplus-card:active{transform:scale(.985)}.labplus-card b{display:block;font-size:18px;margin:7px 0}.labplus-card small{color:#9eb6c8;line-height:1.35}.labplus-icon{font-size:27px}.labplus-modal{position:fixed;inset:0;z-index:180;background:#000d;display:none;overflow:auto;padding:12px}.labplus-modal.on{display:block}.labplus-shell{width:min(1160px,100%);margin:0 auto 30px;background:#070c10;border:1px solid #4a6474;border-radius:20px;box-shadow:0 30px 100px #000;overflow:hidden}.labplus-top{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:13px 15px;background:#10171c;border-bottom:1px solid #344955}.labplus-top h2{margin:3px 0;font-size:22px}.labplus-close{border:1px solid #47667a;background:#142735;color:white;border-radius:12px;padding:10px 12px;font-weight:800}.labplus-tabs{display:flex;gap:7px;padding:10px;overflow-x:auto;background:#090e12;border-bottom:1px solid #24343e}.labplus-tab{white-space:nowrap;border:1px solid #415869;background:#12202a;color:#dcecf5;border-radius:999px;padding:8px 11px;font-weight:800}.labplus-tab.on{background:#174c6c;border-color:#67c7ff}.labplus-body{padding:12px}.labplus-layout{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(270px,.7fr);gap:12px}.labplus-panel{background:radial-gradient(circle at 50% 0,#2b3034,#101417 65%,#07090b);border:1px solid #4d5960;border-radius:16px;padding:10px;box-shadow:inset 0 0 40px #000b}.labplus-panel svg{width:100%;height:auto;display:block}.labplus-side{display:flex;flex-direction:column;gap:10px}.labplus-info,.labplus-scenario{border:1px solid #31546a;background:#0b1c28;border-radius:15px;padding:14px}.labplus-info h3,.labplus-scenario h3{margin:5px 0 8px}.labplus-info p,.labplus-scenario p{color:#b5cad8;line-height:1.45}.labplus-choice{display:block;width:100%;text-align:left;margin-top:7px;border:1px solid #3c6177;background:#112a3a;color:#eef8ff;border-radius:11px;padding:10px;font-weight:750}.labplus-choice.good{border-color:#57d691;background:#123628}.labplus-choice.bad{border-color:#ff7e84;background:#3b171b}.labplus-feedback{margin-top:10px;padding:10px;border-radius:10px;background:#08141d;color:#bcd2df;min-height:42px}.labplus-next{margin-top:9px;width:100%;border:1px solid #4e748c;background:#17364a;color:#fff;border-radius:11px;padding:10px;font-weight:850}.labplus-hot{cursor:pointer;transition:.15s}.labplus-hot:hover{filter:brightness(1.22)}.lp-label{fill:#eef4f7;font:700 11px system-ui,sans-serif}.lp-small{fill:#aebfc9;font:600 8px system-ui,sans-serif}.lp-dim{fill:#75909f;font:600 8px system-ui,sans-serif}.lp-green{fill:#73e6a0}.lp-cyan{fill:#67d2ff}.lp-amber{fill:#ffd36d}.lp-red{fill:#ff737c}.labplus-note{margin:9px 3px 0;color:#839baa;font-size:11px;line-height:1.4}@media(max-width:760px){.labplus-layout{grid-template-columns:1fr}.labplus-grid{grid-template-columns:1fr 1fr}.labplus-home{padding:15px}.labplus-card{min-height:112px;padding:12px}.labplus-head{align-items:flex-start;flex-direction:column}}@media(max-width:420px){.labplus-grid{grid-template-columns:1fr}.labplus-card{min-height:auto}.labplus-modal{padding:5px}.labplus-body{padding:7px}}