:root{--bg:#07111f;--panel:#0e1b2e;--panel2:#13243b;--ink:#eef6ff;--muted:#9bb0c9;--line:#263a55;--mint:#65e6b4;--cyan:#63c7ff;--amber:#ffc857;--red:#ff7b72;--purple:#b29cff;--shadow:0 18px 55px #02081488;font-family:Inter,"Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;color-scheme:dark}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 80% 0,#112b48 0,transparent 34rem),var(--bg);color:var(--ink);min-height:100vh;font-size:16px;line-height:1.55}button,input,select{font:inherit}button{color:inherit}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.topbar{height:68px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 clamp(16px,4vw,54px);border-bottom:1px solid var(--line);background:#07111eea;backdrop-filter:blur(16px);position:sticky;top:0;z-index:20}.brand{display:flex;gap:12px;align-items:center;background:none;border:0;padding:0;cursor:pointer;justify-self:start;font-weight:700}.brand-mark{background:var(--mint);color:#062018;border-radius:8px;padding:5px 8px;font-weight:900;letter-spacing:-1px}.lecture-title{font-size:.9rem;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}.icon-btn{justify-self:end;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);background:var(--panel);cursor:pointer}
.lab-nav{position:fixed;right:22px;top:78px;width:min(330px,calc(100vw - 44px));background:#0b1728f2;border:1px solid var(--line);border-radius:16px;padding:10px;box-shadow:var(--shadow);z-index:30;display:none}.lab-nav.open{display:block}.nav-item{display:block;width:100%;text-align:left;border:0;background:transparent;padding:11px 12px;border-radius:10px;cursor:pointer;color:var(--muted)}.nav-item:hover,.nav-item:focus-visible{background:var(--panel2);color:var(--ink)}
#app{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:40px 0 80px}.eyebrow{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--mint);font-weight:800}.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:42px;align-items:center;min-height:410px}.hero h1{font-size:clamp(2.6rem,6vw,5.6rem);line-height:.95;margin:14px 0 24px;letter-spacing:-.055em;max-width:800px}.hero h1 em{color:var(--mint);font-style:normal}.hero-copy{color:var(--muted);font-size:1.08rem;max-width:620px}.concept-map{background:linear-gradient(145deg,#10243b,#0b1626);border:1px solid #31506e;border-radius:24px;padding:28px;min-height:310px;display:grid;place-items:center;box-shadow:var(--shadow)}.map-flow{width:100%;display:flex;align-items:center;justify-content:space-between;gap:9px}.map-node{background:var(--panel2);border:1px solid #385572;padding:16px 12px;border-radius:14px;text-align:center;min-width:90px}.map-node.system{border-color:var(--mint);color:var(--mint)}.map-arrow{color:var(--cyan);font-size:1.5rem}.map-stack{margin-top:24px;color:var(--muted);font-size:.9rem;text-align:center}
.section-head{display:flex;justify-content:space-between;align-items:end;margin:34px 0 18px;gap:20px}.section-head h2{margin:0;font-size:1.45rem}.section-head p{margin:0;color:var(--muted)}.lab-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.lab-card{border:1px solid var(--line);background:linear-gradient(145deg,var(--panel),#0a1627);border-radius:18px;padding:20px;cursor:pointer;text-align:left;min-height:205px;transition:.2s transform,.2s border-color;position:relative;overflow:hidden}.lab-card:hover,.lab-card:focus-visible{transform:translateY(-3px);border-color:var(--cyan)}.lab-no{font-size:.78rem;color:var(--cyan);font-weight:800;letter-spacing:.12em}.lab-card h3{font-size:1.18rem;margin:18px 0 8px}.lab-card p{margin:0;color:var(--muted);font-size:.93rem}.page-tag{position:absolute;right:15px;top:15px;border:1px solid var(--line);border-radius:999px;padding:3px 9px;font-size:.76rem;color:var(--muted)}.card-arrow{position:absolute;right:18px;bottom:15px;color:var(--mint);font-size:1.3rem}
.lab-header{display:flex;align-items:end;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);padding-bottom:22px;margin-bottom:22px}.lab-header h1{font-size:clamp(2rem,4vw,3.4rem);line-height:1;margin:8px 0 0;letter-spacing:-.04em}.back-btn{border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:9px 13px;cursor:pointer}.back-btn:hover{border-color:var(--cyan)}.objective{color:var(--muted);max-width:680px;margin:8px 0 0}.phase-tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:20px 0}.phase-tab{border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:11px;cursor:pointer;color:var(--muted);font-weight:700}.phase-tab.active{background:var(--mint);border-color:var(--mint);color:#052117}.phase-tab.done:not(.active){border-color:#397762;color:var(--mint)}.phase-panel{border:1px solid var(--line);background:#091525cc;border-radius:20px;padding:clamp(18px,3vw,30px);min-height:470px;box-shadow:var(--shadow)}.phase-kicker{color:var(--mint);font-weight:800;text-transform:uppercase;letter-spacing:.1em;font-size:.78rem}.phase-panel h2{margin:8px 0 8px;font-size:1.55rem}.prompt{color:var(--muted);margin-top:0}.workspace{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:24px}.surface{background:var(--panel);border:1px solid var(--line);border-radius:15px;padding:18px;min-height:220px}.surface h3{margin:0 0 14px;font-size:.92rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}.phone{width:min(260px,100%);margin:auto;background:#02070d;border:7px solid #263647;border-radius:30px;min-height:310px;padding:18px 12px 16px;box-shadow:0 15px 35px #0008}.phone-bar{height:5px;width:70px;background:#53687c;border-radius:4px;margin:0 auto 22px}.screen{background:#f5f8fb;color:#122033;border-radius:12px;min-height:235px;padding:18px}.screen h4{margin:0 0 18px}.screen input{width:100%;color:#18283c;background:white;border:1px solid #aab8c8;border-radius:7px;padding:9px}.android-btn{display:block;width:100%;background:#1769aa;border:0;border-radius:7px;padding:9px;margin-top:12px;color:white;cursor:pointer}.stack{display:flex;flex-direction:column-reverse;gap:9px;min-height:210px;justify-content:flex-start}.stack-card{border-left:5px solid var(--cyan);background:var(--panel2);border-radius:10px;padding:14px;animation:rise .3s ease}.stack-card.top{border-color:var(--mint);box-shadow:0 0 0 1px #65e6b466}.stack-base{text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:8px;padding:9px;font-size:.85rem}@keyframes rise{from{transform:translateY(12px);opacity:0}}
.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.primary,.secondary,.danger{border:0;border-radius:10px;padding:10px 15px;cursor:pointer;font-weight:750}.primary{background:var(--mint);color:#062018}.secondary{background:var(--panel2);border:1px solid var(--line)}.danger{background:#542a31;color:#ffd5d1}.primary:disabled,.secondary:disabled{opacity:.4;cursor:not-allowed}.code{background:#030a13;border:1px solid #213550;border-radius:12px;padding:15px;overflow:auto;color:#c9def2;font-family:"Cascadia Code",Consolas,monospace;font-size:.88rem;white-space:pre-wrap}.code .hot{color:var(--mint)}.intent-card{border:1px solid var(--cyan);background:#0b2136;border-radius:14px;padding:16px}.intent-row{display:grid;grid-template-columns:80px 1fr;gap:10px;padding:7px 0;border-bottom:1px solid #23415d}.intent-row:last-child{border:0}.intent-key{color:var(--muted)}.route{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:center;gap:12px;margin-top:26px}.route-node{text-align:center;background:var(--panel2);border:1px solid var(--line);border-radius:13px;padding:18px 8px}.route-node.active{border-color:var(--mint);box-shadow:0 0 25px #65e6b422}.route-arrow{color:var(--cyan);font-size:1.5rem}.answer-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.choice{border:1px solid var(--line);background:var(--panel2);border-radius:10px;padding:13px;text-align:left;cursor:pointer}.choice.selected{border-color:var(--cyan);background:#12304a}.choice.correct{border-color:var(--mint);background:#14392e}.choice.wrong{border-color:var(--red);background:#3b2026}.feedback{margin-top:15px;padding:13px;border-radius:10px;background:#10253a;border-left:4px solid var(--cyan)}
.filter-controls{display:grid;grid-template-columns:1fr 1fr;gap:12px}.field label{display:block;color:var(--muted);font-size:.85rem;margin-bottom:5px}.field select,.field input{width:100%;background:#081422;border:1px solid var(--line);color:var(--ink);border-radius:9px;padding:10px}.app-list{display:grid;gap:9px}.app-option{border:1px solid var(--line);border-radius:11px;padding:12px;display:grid;grid-template-columns:38px 1fr auto;gap:10px;align-items:center;background:var(--panel2)}.app-option .app-icon{height:34px;width:34px;border-radius:8px;display:grid;place-items:center;background:#28445f}.app-option.match{border-color:var(--mint)}.app-option.reject{opacity:.48}.badge{font-size:.75rem;padding:3px 8px;border-radius:999px;background:#263b51}.match .badge{background:#174c3b;color:#91f2cb}.chooser{background:#e9eef5;color:#172233;border-radius:18px;padding:18px;max-width:420px;margin:auto}.chooser h3{margin:0 0 15px}.chooser-app{background:white;border:1px solid #c7d0dc;border-radius:12px;padding:13px;margin:8px 0;display:flex;gap:10px;align-items:center;cursor:pointer}.toggle{display:flex;gap:10px;align-items:center}.toggle input{width:20px;height:20px}.step-list{display:grid;gap:10px}.debug-step{border:1px solid var(--line);background:var(--panel2);border-radius:12px;padding:14px;display:flex;gap:13px;align-items:center}.step-dot{width:30px;height:30px;border:2px solid #4c6580;border-radius:50%;display:grid;place-items:center;flex:none}.debug-step.done{border-color:#397762}.debug-step.done .step-dot{background:var(--mint);border-color:var(--mint);color:#062018}.debug-step.error{border-color:var(--red)}.status-box{border:1px solid var(--line);border-radius:12px;padding:15px;margin-top:14px;background:#07111f;font-family:monospace}.explain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}.explain-card{background:var(--panel2);border:1px solid var(--line);border-radius:12px;padding:15px}.explain-card strong{display:block;color:var(--mint);margin-bottom:6px}.next-bar{display:flex;justify-content:space-between;align-items:center;margin-top:18px}.small{font-size:.85rem;color:var(--muted)}
@media(max-width:850px){.hero,.workspace{grid-template-columns:1fr}.hero{padding-top:10px}.concept-map{min-height:240px}.lab-grid{grid-template-columns:repeat(2,1fr)}.route{grid-template-columns:1fr}.route-arrow{transform:rotate(90deg);justify-self:center}.explain-grid{grid-template-columns:1fr}.topbar{grid-template-columns:1fr auto}.lecture-title{display:none}.lab-header{align-items:start}.phase-panel{min-height:auto}}
@media(max-width:560px){#app{width:min(100% - 22px,1180px);padding-top:22px}.topbar{padding:0 12px}.brand>span:last-child{font-size:.88rem}.lab-grid{grid-template-columns:1fr}.map-flow{flex-direction:column}.map-arrow{transform:rotate(90deg)}.phase-tabs{grid-template-columns:repeat(2,1fr)}.lab-header{display:block}.back-btn{margin-top:18px}.filter-controls,.answer-grid{grid-template-columns:1fr}.phase-panel{padding:15px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}