:root{
  --bg:#eef7f5;--paper:#fff;--ink:#16302d;--muted:#64807b;--line:#d6e7e3;
  --primary:#0f766e;--primary2:#14b8a6;--lime:#c7dd00;--aqua:#23b8bd;
  --soft:#f2fbf9;--accent:#eafff8;--shadow:0 26px 70px rgba(20,72,67,.15);
  --radius:28px;--top:76px;--bottom:72px;
}
*{box-sizing:border-box}html,body{height:100%;margin:0}body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:radial-gradient(circle at 10% 15%,#dff6f0 0,transparent 34%),radial-gradient(circle at 90% 85%,#edf8c9 0,transparent 30%),var(--bg);color:var(--ink);overflow:hidden}
body.dark{--bg:#0b1716;--paper:#102321;--ink:#e8fbf7;--muted:#9cbab4;--line:#24433e;--soft:#122b27;--accent:#163a34;--shadow:0 26px 70px rgba(0,0,0,.35)}
button,textarea{font:inherit}.app-shell{height:100%;position:relative}.topbar{height:var(--top);position:fixed;inset:0 0 auto 0;z-index:30;display:flex;align-items:center;justify-content:space-between;padding:12px clamp(16px,3vw,46px);background:color-mix(in srgb,var(--paper) 90%,transparent);backdrop-filter:blur(15px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:13px;text-decoration:none;color:var(--ink)}.brand img{width:152px;height:42px;object-fit:contain;object-position:left center;background:white;border-radius:12px;padding:4px}.brand span{display:flex;flex-direction:column}.brand strong{font-size:15px}.brand small{color:var(--muted);font-size:12px;margin-top:2px}.top-actions{display:flex;gap:8px}.icon-btn{width:42px;height:42px;border:1px solid var(--line);border-radius:14px;background:var(--paper);color:var(--ink);cursor:pointer;font-size:18px}.icon-btn:hover{transform:translateY(-1px);box-shadow:0 8px 24px rgba(15,118,110,.12)}
.progress-track{position:fixed;z-index:31;left:0;right:0;top:var(--top);height:4px;background:transparent}.progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--primary2),var(--lime));transition:width .35s ease}
.stage{position:fixed;left:0;right:0;top:calc(var(--top) + 4px);bottom:var(--bottom);display:flex;align-items:center;justify-content:center;padding:clamp(10px,2vw,26px);perspective:1800px}
.flip-page{position:absolute;width:min(1240px,calc(100vw - 44px));height:min(720px,calc(100vh - var(--top) - var(--bottom) - 28px));background:var(--paper);border:1px solid color-mix(in srgb,var(--line) 80%,transparent);border-radius:var(--radius);box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:rotateY(18deg) translateX(70px) scale(.985);transform-origin:left center;transition:opacity .28s ease,transform .45s cubic-bezier(.2,.8,.2,1),visibility .28s;overflow:auto;scrollbar-width:thin;scrollbar-color:var(--line) transparent}.flip-page.active{opacity:1;visibility:visible;transform:rotateY(0) translateX(0) scale(1);z-index:2}.flip-page.was-before{transform:rotateY(-18deg) translateX(-70px) scale(.985);transform-origin:right center}.slide-inner{min-height:100%;padding:clamp(28px,4.3vw,64px);display:flex;flex-direction:column;justify-content:center}.section-kicker,.eyebrow{display:inline-flex;align-self:flex-start;font-size:12px;letter-spacing:.14em;font-weight:800;color:var(--primary);background:var(--soft);border:1px solid var(--line);padding:8px 11px;border-radius:999px;margin-bottom:18px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(42px,6vw,78px);line-height:.98;letter-spacing:-.055em;max-width:940px;margin-bottom:22px}h2{font-size:clamp(30px,4.1vw,54px);line-height:1.04;letter-spacing:-.045em;margin-bottom:24px;max-width:980px}h3{font-size:19px;margin-bottom:10px}.intro,.lead{font-size:clamp(16px,1.8vw,21px);line-height:1.65;color:var(--muted);max-width:980px}.lead{font-size:clamp(17px,2vw,23px)}code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:color-mix(in srgb,var(--soft) 78%,var(--paper));border:1px solid var(--line);padding:7px 9px;border-radius:9px;color:var(--ink)}
.cover-page{background:linear-gradient(135deg,#fafffe 0%,#ebfaf6 50%,#f8f9d9 100%);overflow:hidden}.dark .cover-page{background:linear-gradient(135deg,#102321,#0b302c 56%,#273218)}.cover-content{position:relative;z-index:2}.cover-orb{position:absolute;border-radius:50%;filter:blur(1px);opacity:.7}.orb-a{width:330px;height:330px;right:-80px;top:-100px;background:linear-gradient(135deg,var(--primary2),var(--lime))}.orb-b{width:220px;height:220px;right:180px;bottom:-120px;background:linear-gradient(135deg,#a7f3d0,#e5f65b)}.cover-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0 26px;max-width:980px}.cover-card{background:color-mix(in srgb,var(--paper) 72%,transparent);backdrop-filter:blur(8px);border:1px solid color-mix(in srgb,var(--line) 75%,transparent);padding:17px;border-radius:18px;display:grid;grid-template-columns:auto 1fr;column-gap:12px;row-gap:3px}.cover-card>span{grid-row:1/3;width:36px;height:36px;border-radius:12px;display:grid;place-items:center;background:var(--primary);color:#fff;font-size:12px;font-weight:800}.cover-card b{font-size:15px}.cover-card small{color:var(--muted);line-height:1.35}.identity-line{display:flex;gap:9px;align-items:center;flex-wrap:wrap;color:var(--muted);font-size:14px}.identity-line b{color:var(--ink)}
.grid-2,.grid-3{display:grid;gap:16px}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-2.unequal{grid-template-columns:.9fr 1.1fr}.grid-3{grid-template-columns:repeat(3,1fr)}.panel{border:1px solid var(--line);background:var(--paper);border-radius:20px;padding:22px}.panel.soft{background:var(--soft)}.panel.accent{background:linear-gradient(145deg,var(--soft),var(--paper))}.panel p:last-child{margin-bottom:0;color:var(--muted);line-height:1.55}.big-icon{width:44px;height:44px;display:grid;place-items:center;border-radius:14px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:white;font-weight:800;margin-bottom:16px}.outcomes{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:18px}.outcomes>div{display:flex;gap:10px;background:var(--soft);border:1px solid var(--line);padding:14px;border-radius:16px}.outcomes span{flex:0 0 30px;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:var(--primary);color:#fff;font-weight:800;font-size:12px}.outcomes p{font-size:13px;line-height:1.4;margin:0}.callout{margin-top:18px;padding:17px 19px;border-left:5px solid var(--primary2);background:var(--soft);border-radius:0 16px 16px 0;line-height:1.6;color:var(--muted)}.callout b{color:var(--ink)}.callout.small{font-size:14px}.mini-flow{display:flex;gap:10px;align-items:center;justify-content:center;flex-wrap:wrap;margin-top:20px}.mini-flow span{padding:10px 13px;border:1px solid var(--line);border-radius:12px;background:var(--paper);font-size:13px}.mini-flow b{color:var(--primary2)}
.style-map{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.style-map article{border:1px solid var(--line);border-radius:20px;padding:20px;background:linear-gradient(180deg,var(--paper),var(--soft));display:flex;flex-direction:column;gap:8px}.style-map h3{font-size:22px;margin:2px 0}.style-map p{color:var(--muted);line-height:1.5;font-size:14px;min-height:84px}.style-map code{margin-top:auto;font-size:13px}.style-pill{font-size:11px;font-weight:900;letter-spacing:.1em;color:#fff;background:var(--primary);align-self:flex-start;padding:6px 9px;border-radius:999px}.footnote{margin-top:18px;color:var(--muted);font-size:13px;line-height:1.5}.example{display:flex;flex-direction:column;gap:7px;margin-bottom:15px}.example span{font-size:12px;font-weight:800;color:var(--primary)}.example code{display:block}.formula{color:var(--muted);line-height:1.55;font-size:14px}.sample-ref{padding:16px;border:1px solid var(--line);background:var(--paper);border-radius:14px;line-height:1.65;font-size:14px}.tip-row{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:18px;font-size:13px}.tip-row span{border:1px solid var(--line);background:var(--soft);padding:7px 10px;border-radius:999px}.number-demo{display:grid;gap:8px}.number-demo p{margin:0;padding:12px;background:var(--soft);border-radius:12px;line-height:1.5}.number-demo mark{background:var(--lime);color:#182100;padding:2px 5px;border-radius:5px}.warning{margin-top:14px;padding:12px;border-radius:12px;background:#fff8db;color:#6d5a0a;font-size:13px;line-height:1.45}.dark .warning{background:#42380f;color:#ffec96}
.source-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.source-cards article{border:1px solid var(--line);border-radius:20px;padding:22px;background:var(--soft)}.source-icon{width:46px;height:46px;border-radius:15px;background:var(--primary);color:white;display:grid;place-items:center;font-size:22px;margin-bottom:16px}.source-cards ul{margin:0;padding-left:20px;color:var(--muted);line-height:1.7;font-size:14px}.anatomy-box{display:flex;flex-wrap:wrap;gap:9px;padding:26px;border:1px solid var(--line);background:var(--soft);border-radius:22px;font-size:20px;line-height:1.8}.part{padding:2px 7px;border-radius:7px}.part.author,.dot.author{background:#c7f3ec}.part.year,.dot.year{background:#e7f2ae}.part.title,.dot.title{background:#cae5ff}.part.container,.dot.container{background:#ead7ff}.part.locator,.dot.locator{background:#ffe2c6}.part.id,.dot.id{background:#ffcfe0}.dark .part{color:#112522}.legend{display:flex;gap:14px;flex-wrap:wrap;margin:14px 0;color:var(--muted);font-size:12px}.legend span{display:flex;gap:6px;align-items:center}.dot{width:11px;height:11px;border-radius:50%;display:inline-block}.subhead{margin:18px 0 12px}.error-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.error-row div{border:1px solid var(--line);background:var(--paper);padding:12px;border-radius:13px;font-size:13px}.decision-flow{width:min(760px,100%);margin:0 auto;display:grid;justify-items:center;gap:10px}.decision{width:100%;padding:16px 20px;text-align:center;border:1px solid var(--line);background:var(--soft);border-radius:16px}.decision.start{background:linear-gradient(135deg,var(--primary),var(--primary2));color:white}.decision.end{border:2px solid var(--primary2);font-weight:700}.arrow{color:var(--primary);font-size:22px}.split{width:100%;display:grid;grid-template-columns:1fr 1fr;gap:10px}.split span{padding:13px;border:1px solid var(--line);background:var(--paper);border-radius:14px;text-align:center;font-size:13px}
.steps{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.steps>div{display:flex;gap:14px;padding:15px;border:1px solid var(--line);border-radius:16px;background:var(--soft)}.steps>div>span{width:34px;height:34px;flex:0 0 34px;border-radius:11px;background:var(--primary);color:white;display:grid;place-items:center;font-weight:800}.steps h3{font-size:15px;margin:1px 0 4px}.steps p{margin:0;color:var(--muted);font-size:13px;line-height:1.45}.clean-list{margin:0;padding-left:20px;color:var(--muted);line-height:1.75;font-size:14px}.clean-list b{color:var(--ink)}.compare-table{border:1px solid var(--line);border-radius:18px;overflow:hidden}.tr{display:grid;grid-template-columns:.8fr 1fr 1fr}.tr>div{padding:13px 14px;border-bottom:1px solid var(--line);border-right:1px solid var(--line);font-size:13px;line-height:1.4}.tr>div:last-child{border-right:0}.tr:last-child>div{border-bottom:0}.tr.head{background:var(--primary);color:white;font-weight:800}.tr:not(.head)>div:first-child{font-weight:700;background:var(--soft)}.timeline{display:grid;grid-template-columns:repeat(6,1fr);gap:10px}.timeline>div{position:relative;border:1px solid var(--line);background:var(--soft);padding:15px;border-radius:16px;min-height:140px}.timeline>div:not(:last-child):after{content:"→";position:absolute;right:-14px;top:50%;z-index:3;width:18px;height:18px;background:var(--paper);color:var(--primary);display:grid;place-items:center}.timeline b{display:block;color:var(--primary);font-size:13px;margin-bottom:9px}.timeline span{font-size:12px;line-height:1.45;color:var(--muted)}.mistakes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.mistakes article{border:1px solid var(--line);background:var(--soft);padding:17px;border-radius:17px}.mistakes article>b{font-size:11px;letter-spacing:.12em;color:var(--primary)}.mistakes h3{font-size:15px;margin:8px 0 6px}.mistakes p{margin:0;color:var(--muted);font-size:12.5px;line-height:1.45}
.exercise-card{border:1px solid var(--line);background:var(--soft);border-radius:22px;padding:22px}.exercise-card>p{line-height:1.65;color:var(--muted)}.fill-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}.fill-grid span{background:var(--paper);border:1px dashed var(--line);padding:12px;border-radius:12px;font-size:12px}.reveal-btn{margin-top:14px;border:0;background:var(--primary);color:white;padding:11px 14px;border-radius:12px;font-weight:800;cursor:pointer}.reveal{display:none;margin-top:12px;padding:14px;border:1px solid var(--line);background:#ecfff4;color:#255b3f;border-radius:12px;line-height:1.55;font-size:13px}.dark .reveal{background:#143326;color:#b6efd1}.reveal.show{display:block}.challenge-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.challenge-grid>div{border:1px solid var(--line);background:var(--soft);border-radius:16px;padding:13px}.challenge-grid b{display:block;color:var(--primary);margin-bottom:8px}.challenge-grid textarea{width:100%;min-height:90px;resize:vertical;border:1px solid var(--line);border-radius:11px;background:var(--paper);color:var(--ink);padding:10px;outline:none}.challenge-grid textarea:focus{border-color:var(--primary2);box-shadow:0 0 0 3px color-mix(in srgb,var(--primary2) 15%,transparent)}.quiz{display:grid;gap:13px}.quiz-q{border:1px solid var(--line);background:var(--soft);border-radius:16px;padding:15px}.quiz-q p{margin-bottom:10px;font-weight:700}.quiz-q button{border:1px solid var(--line);background:var(--paper);color:var(--ink);padding:9px 11px;border-radius:10px;margin:0 6px 6px 0;cursor:pointer}.quiz-q button.correct{background:#ddfbe8;border-color:#71d49a;color:#155b33}.quiz-q button.wrong{background:#ffe7e7;border-color:#ed9d9d;color:#7e2424}.dark .quiz-q button.correct{background:#183a27;color:#bdf4ce}.dark .quiz-q button.wrong{background:#412121;color:#ffc1c1}.quiz-footer{display:flex;justify-content:space-between;align-items:center}.quiz-footer span{font-weight:800}.quiz-footer button{border:1px solid var(--line);background:var(--paper);color:var(--ink);padding:8px 12px;border-radius:10px;cursor:pointer}.task-board{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.task-board article{border:1px solid var(--line);background:var(--soft);padding:17px;border-radius:18px}.task-board article>span{display:grid;place-items:center;width:33px;height:33px;border-radius:11px;background:var(--primary);color:#fff;font-weight:900;margin-bottom:11px}.task-board h3{font-size:15px;margin-bottom:5px}.task-board p{margin:0;color:var(--muted);font-size:12.5px;line-height:1.5}.checklist{display:grid;grid-template-columns:repeat(2,1fr);gap:11px}.checklist label{display:flex;align-items:flex-start;gap:12px;padding:14px;border:1px solid var(--line);background:var(--soft);border-radius:14px;font-size:13px;line-height:1.45}.checklist input{margin-top:2px;width:18px;height:18px;accent-color:var(--primary)}.takeaways{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.takeaways>div{display:flex;gap:14px;padding:17px;border:1px solid var(--line);background:var(--soft);border-radius:17px}.takeaways b{width:38px;height:38px;flex:0 0 38px;border-radius:12px;display:grid;place-items:center;background:var(--primary);color:white;font-size:12px}.takeaways p{margin:0;color:var(--muted);line-height:1.45;font-size:13.5px}.takeaways strong{color:var(--ink)}blockquote{margin:20px 0 0;padding:20px 24px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:white;border-radius:18px;font-size:clamp(18px,2.2vw,28px);font-weight:700;line-height:1.3}.refs{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.refs a,.ref-local{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);border:1px solid var(--line);background:var(--soft);padding:16px;border-radius:15px}.refs a:hover{border-color:var(--primary2);transform:translateY(-1px)}.refs span{color:var(--muted);font-size:12px;margin-top:4px;line-height:1.4}.closing{display:flex;gap:14px;align-items:center;margin-top:18px;padding-top:17px;border-top:1px solid var(--line)}.closing img{width:160px;height:46px;object-fit:contain;object-position:left;background:white;border-radius:10px;padding:4px}.closing div{display:flex;flex-direction:column}.closing span{color:var(--muted);font-size:12px;margin-top:3px}
.bottom-nav{position:fixed;inset:auto 0 0 0;height:var(--bottom);z-index:25;display:flex;align-items:center;justify-content:center;gap:22px;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(15px);border-top:1px solid var(--line)}.bottom-nav>button{min-width:140px;border:1px solid var(--line);background:var(--paper);color:var(--ink);height:44px;padding:0 14px;border-radius:14px;cursor:pointer;font-weight:750}.bottom-nav>button:hover:not(:disabled){border-color:var(--primary2);transform:translateY(-1px)}.bottom-nav>button:disabled{opacity:.35;cursor:not-allowed}.page-indicator{min-width:80px;text-align:center;font-weight:900}.page-indicator i{font-style:normal;color:var(--muted);margin:0 5px;font-weight:400}.toc{position:fixed;z-index:45;right:0;top:0;bottom:0;width:min(420px,92vw);background:var(--paper);border-left:1px solid var(--line);box-shadow:-20px 0 50px rgba(0,0,0,.18);transform:translateX(103%);transition:transform .28s ease;display:flex;flex-direction:column}.toc.open{transform:translateX(0)}.toc-head{height:78px;padding:15px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.toc-head div{display:flex;flex-direction:column}.toc-head small{color:var(--muted);margin-top:3px}.toc-head button{width:38px;height:38px;border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:12px;font-size:22px;cursor:pointer}.toc-list{overflow:auto;padding:10px 12px;flex:1}.toc-list button{display:flex;gap:12px;width:100%;align-items:center;text-align:left;border:0;background:transparent;color:var(--ink);padding:11px;border-radius:12px;cursor:pointer}.toc-list button:hover,.toc-list button.active{background:var(--soft)}.toc-list i{font-style:normal;width:30px;height:30px;border-radius:9px;background:var(--primary);color:#fff;display:grid;place-items:center;font-size:11px;font-weight:800}.toc-list span{font-size:13px}.toc-note{padding:14px 18px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}kbd{padding:2px 6px;border:1px solid var(--line);background:var(--soft);border-radius:5px;color:var(--ink)}.scrim{position:fixed;z-index:40;inset:0;background:rgba(0,0,0,.35);opacity:0;visibility:hidden;transition:.2s}.scrim.show{opacity:1;visibility:visible}
@media (max-width:900px){:root{--top:68px;--bottom:64px}.brand img{width:118px;height:37px}.brand small{display:none}.flip-page{width:calc(100vw - 22px);height:calc(100vh - var(--top) - var(--bottom) - 18px);border-radius:20px}.slide-inner{padding:26px}.grid-3,.style-map,.source-cards,.task-board{grid-template-columns:repeat(2,1fr)}.outcomes{grid-template-columns:repeat(2,1fr)}.timeline{grid-template-columns:repeat(3,1fr)}.timeline>div:nth-child(3):after{display:none}.fill-grid{grid-template-columns:repeat(2,1fr)}.cover-grid{grid-template-columns:1fr}.cover-card small{display:none}.bottom-nav{gap:10px}.bottom-nav>button{min-width:105px}.bottom-nav>button span{display:none}.mistakes{grid-template-columns:repeat(2,1fr)}}
@media (max-width:620px){.topbar{padding:10px 12px}.brand span{display:none}.top-actions{gap:5px}.icon-btn{width:39px;height:39px}.slide-inner{padding:22px 19px}.grid-2,.grid-2.unequal,.grid-3,.style-map,.source-cards,.task-board,.checklist,.refs,.challenge-grid,.takeaways,.mistakes{grid-template-columns:1fr}.outcomes{grid-template-columns:1fr}.timeline{grid-template-columns:repeat(2,1fr)}.timeline>div:after{display:none!important}.steps{grid-template-columns:1fr}.error-row{grid-template-columns:1fr}.split{grid-template-columns:1fr}.tr{grid-template-columns:.7fr 1fr 1fr}.tr>div{padding:8px;font-size:11px}.anatomy-box{font-size:15px;padding:16px}.style-map p{min-height:auto}.bottom-nav{justify-content:space-between;padding:0 12px}.page-indicator{min-width:auto}.bottom-nav>button{min-width:92px}.orb-a{width:210px;height:210px}.cover-grid{margin:12px 0}.identity-line span:last-child{display:none}}
@media print{body{overflow:visible;background:white}.topbar,.bottom-nav,.progress-track,.toc,.scrim{display:none!important}.stage{position:static;display:block;padding:0}.flip-page{position:static;visibility:visible;opacity:1;transform:none!important;width:100%;height:auto;min-height:100vh;box-shadow:none;border:0;border-radius:0;page-break-after:always;overflow:visible}.slide-inner{min-height:100vh}.reveal{display:block!important}}