:root{--bg:#fbfaf7;--paper:#fff;--paper-2:#f6f5f1;--text:#192027;--muted:#737780;--soft:#a0a5ac;--border:#ebeae6;--orange:#f3663c;--orange-deep:#e94f29;--dark:#18202c;--shadow:0 14px 54px rgba(30,36,46,.045);--shadow-hover:0 18px 45px rgba(32,40,52,.09);--radius:20px;--ease:cubic-bezier(.2,.8,.2,1);color-scheme:light}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:93px}body{margin:0;min-width:320px;background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;font-size:14px;-webkit-font-smoothing:antialiased}button,input{font:inherit}button{cursor:pointer}a{text-decoration:none;color:inherit}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #f9a785;outline-offset:3px}svg{display:block;flex:none}p{line-height:1.9}strong{font-weight:700}.ico{height:18px;width:18px;stroke-width:1.85;display:inline-flex;vertical-align:middle;flex:none}.no-select{user-select:none}::selection{background:#facdbb;color:#222}
.topbar{height:78px;background:rgba(255,255,255,.9);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:30;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px)}.topbar-inner{height:100%;max-width:1600px;margin:0 auto;padding:0 32px 0 25px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:11px;cursor:pointer;min-width:236px}.brand-mark{width:43px;height:43px;background:var(--dark);border-radius:13px;display:flex;align-items:center;justify-content:center;transform:rotate(-8deg);position:relative;box-shadow:0 7px 20px #17203320}.brand-mark span{transform:rotate(8deg);font-size:25px;color:#ff8a58;font-weight:900;line-height:1}.brand-mark i{position:absolute;width:8px;height:8px;border-radius:50%;background:#ffbf73;right:-2px;top:-3px;border:2px solid var(--paper)}.brand-words{display:flex;flex-direction:column;gap:0}.brand-words strong{font-weight:900;letter-spacing:-1.5px;font-size:24px;line-height:23px}.brand-dot{color:var(--orange)}.brand-words small{font-size:8px;font-weight:800;letter-spacing:1.55px;color:#8b8f97;margin-top:5px}.top-links{display:flex;align-items:center;gap:28px;height:100%;margin-left:15px}.top-links a{height:100%;display:flex;align-items:center;position:relative;color:#727780;font-size:14px;font-weight:600;white-space:nowrap}.top-links a:hover,.top-links a.active{color:var(--text)}.top-links a.active:after{content:"";height:3px;position:absolute;bottom:0;left:0;right:0;background:var(--orange);border-radius:3px 3px 0 0}.header-actions{margin-left:auto;display:flex;align-items:center;gap:11px}.search-trigger{display:flex;align-items:center;gap:10px;border:1px solid var(--border);background:var(--paper-2);color:#92969e;min-width:255px;border-radius:12px;padding:11px 11px;font-size:12px;text-align:left}.search-trigger .ico{width:17px;height:17px;color:#6a707a}.search-trigger kbd{margin-left:auto;border:1px solid #dedfdf;border-radius:5px;font-size:10px;padding:3px 5px;background:var(--paper);color:#979ba3}.icon-button{height:40px;width:40px;display:grid;place-items:center;border:1px solid var(--border);background:var(--paper);color:var(--text);border-radius:11px}.icon-button:hover{border-color:#c9cacc}.header-start{display:flex;align-items:center;gap:10px;color:#fff;background:var(--dark);border:1px solid var(--dark);border-radius:11px;padding:12px 17px;font-weight:700;font-size:12px;white-space:nowrap}.header-start span{color:#ffba9d;font-size:16px}.menu-toggle{display:none}.top-progress{position:fixed;top:0;left:0;height:3px;background:var(--orange);width:0;z-index:80;transition:width .1s linear}
.shell{max-width:1600px;margin:0 auto;display:grid;grid-template-columns:263px minmax(0,1fr);min-height:calc(100vh - 78px)}.sidebar{border-right:1px solid var(--border);background:var(--paper);padding:27px 15px 20px 17px;position:sticky;top:78px;height:calc(100vh - 78px);overflow-y:auto;scrollbar-width:thin;scrollbar-color:#dcdeda transparent;display:flex;flex-direction:column;gap:0}.sidebar-section-label{font-size:11px;letter-spacing:1.1px;color:#979ca4;font-weight:800;display:flex;align-items:center;justify-content:space-between;padding:0 13px;margin:2px 0 13px;text-transform:uppercase}.label-emoji{font-size:15px;color:var(--orange)}.sidebar-count{letter-spacing:0;background:#f6f5f2;padding:3px 7px;border-radius:5px;color:#9c9c9c}.sidebar-primary,.chapter-nav{display:flex;flex-direction:column;gap:3px}.side-link,.chapter-link{display:flex;align-items:center;gap:12px;border-radius:10px;min-height:42px;padding:9px 13px;font-size:13px;color:#6b7079;font-weight:550;transition:background .2s,color .2s}.side-link .ico{width:17px;height:17px;color:#81868e}.side-link:hover,.chapter-link:hover{background:#f7f5f2;color:var(--text)}.side-link.active,.chapter-link.active{background:#fff0e9;color:#dc5b35;font-weight:740}.side-link.active .ico{color:#dc5b35}.sidebar-divider{height:1px;background:var(--border);margin:22px 12px 22px}.chapter-link{gap:11px;font-size:12.5px;min-height:42px;white-space:nowrap}.chapter-number{font-size:10px;color:#b1b6bc;font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:.3px;width:20px}.chapter-link.active .chapter-number{color:#ef9c7f}.chapter-link .ico{height:16px;width:16px;color:#9297a1}.chapter-link.active .ico{color:#dc5b35}.chapter-link .chapter-name{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.sidebar-spacer{flex:1;min-height:32px}.sidebar-progress-card{border-radius:15px;background:#242b37;color:#fff;padding:19px 18px 16px;position:relative;overflow:hidden;margin:0 2px}.progress-asterisk{position:absolute;right:16px;top:7px;color:#fd8355;font-size:32px}.progress-card-label{font-size:11px;color:#bec4ce;font-weight:600}.progress-card-count{font-size:27px;font-weight:800;letter-spacing:-1px;margin:9px 0 12px}.progress-card-count span{font-size:12px;color:#b9c2ce;font-weight:500}.progress-track{height:5px;border-radius:6px;background:#434c59;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#ff744c,#ffc07f);border-radius:6px;transition:width .35s}.progress-caption{font-size:11px;line-height:1.7;color:#bec4ce;margin:11px 0 10px}.progress-card-action{display:flex;align-items:center;justify-content:space-between;border:0;border-top:1px solid #ffffff25;background:transparent;color:#fff;width:100%;text-align:left;font-size:11px;font-weight:800;padding:13px 0 0}.sidebar-foot{text-align:center;font-size:9px;color:#b3b6bd;letter-spacing:1px;font-weight:700;margin-top:22px}.sidebar-foot span{color:var(--orange)}
.main{min-width:0;padding:35px clamp(24px,4vw,67px) 90px}.page-content{max-width:1170px;margin:0 auto;animation:page-enter .3s var(--ease) both}@keyframes page-enter{from{opacity:.2;transform:translateY(9px)}to{opacity:1;transform:none}}.hello-strip{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:19px}.eyebrow{font-size:11px;font-weight:850;letter-spacing:1.35px;color:#eb714f;text-transform:uppercase}.date-strip{font-size:11px;color:#9499a1}.muted{color:var(--muted)}.hero{background:#1e2632;color:#fff;border-radius:24px;min-height:394px;overflow:hidden;display:grid;grid-template-columns:55% 45%;position:relative;isolation:isolate;box-shadow:0 15px 28px #1a26320b}.hero:after{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at 73% 45%,rgba(255,130,78,.26),transparent 32%),radial-gradient(circle at 100% 100%,rgba(230,92,61,.13),transparent 32%);z-index:-1}.hero-left{padding:50px 0 39px clamp(30px,4vw,57px);position:relative;z-index:1}.hero-chip{display:inline-flex;align-items:center;gap:7px;background:rgba(255,255,255,.09);border:1px solid #ffffff19;color:#ffcaa6;border-radius:30px;padding:9px 12px;font-size:10px;font-weight:800;letter-spacing:.6px}.hero-chip i{width:6px;height:6px;border-radius:50%;background:#ff845b;box-shadow:0 0 0 3px #ff845b22}.hero-title{font-size:clamp(33px,3.2vw,51px);letter-spacing:-2.2px;line-height:1.36;margin:21px 0 13px;font-weight:880}.hero-title em{font-style:normal;color:#ff956d;position:relative}.hero-title em:after{content:"";display:block;position:absolute;left:1px;bottom:-4px;height:5px;border-radius:10px;right:-5px;background:#fd8250;transform:rotate(-3deg);opacity:.75}.hero-description{color:#b9c0cc;font-size:13px;line-height:2;margin:19px 0 27px;max-width:395px}.hero-buttons{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;border:1px solid transparent;padding:12px 17px;font-size:12px;font-weight:780;border-radius:11px;min-height:42px;transition:all .2s var(--ease)}.btn:hover{transform:translateY(-2px)}.btn-orange{background:#ff8458;color:#17202a}.btn-orange:hover{background:#ff9a73}.btn-ghost{border-color:#ffffff2d;color:#ecedf2;background:#ffffff0a}.btn-ghost:hover{background:#ffffff1d}.btn-dark{background:var(--dark);color:#fff}.btn-light{background:var(--paper);color:var(--text);border-color:var(--border)}.btn-soft{background:#fff0ea;color:#e3643b}.hero-bottom{display:flex;gap:26px;margin-top:30px;align-items:center}.hero-stat{font-size:21px;font-weight:840;letter-spacing:-.8px}.hero-stat span{font-size:11px;font-weight:500;color:#aeb8c2;margin-left:5px;letter-spacing:0}.hero-art{position:relative;min-width:0;min-height:394px;overflow:hidden}.hero-halo{position:absolute;border:1px solid rgba(255,255,255,.1);border-radius:50%;width:410px;height:410px;right:-76px;top:-21px;box-shadow:0 0 0 51px #ffffff05,0 0 0 105px 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26px;display:flex;flex-direction:column;gap:15px}.terminal-tag{font-size:8px;color:#8390a0;font-weight:800;letter-spacing:1.2px}.terminal-query{font-size:16px;font-weight:800;line-height:1.55;max-width:240px}.terminal-answer{background:#f4f6f4;border-left:3px solid #f4744d;border-radius:7px;padding:11px;font-size:10px;color:#66717e;line-height:1.8}.terminal-answer span{color:#ec714c;font-weight:850}.terminal-input{margin-top:2px;border:1px solid #e8e9ed;border-radius:7px;color:#bec3c8;font-size:9px;padding:9px 10px;display:flex;justify-content:space-between}.float-sticker{position:absolute;background:#ffb06c;color:#222d33;padding:10px 12px;border-radius:12px;box-shadow:0 9px 30px #0002;font-weight:900;font-size:13px;transform:rotate(11deg);right:2%;top:51px}.float-sticker.second{background:#d1efdb;font-size:10px;transform:rotate(10deg);right:58%;top:292px;padding:10px 13px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:15px;margin:37px 0 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.ico{width:21px;height:21px}.path-card:nth-child(1) .path-icon{background:#fff1e8;color:#e66f45}.path-card:nth-child(2) .path-icon{background:#e7f2ed;color:#258b64}.path-card:nth-child(3) .path-icon{background:#eff0fb;color:#6972c3}.path-title{font-size:15px;font-weight:840;margin-bottom:8px}.path-desc{font-size:11px;color:var(--muted);line-height:1.8;max-width:245px}.path-arrow{position:absolute;right:18px;bottom:20px;color:#a9adb4}.chapter-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.chapter-card{border:1px solid var(--border);background:var(--paper);border-radius:17px;min-height:183px;position:relative;padding:20px 20px 18px;cursor:pointer;transition:transform .22s var(--ease),box-shadow .22s,border-color .22s;overflow:hidden}.chapter-card:after{content:attr(data-number);position:absolute;right:11px;top:6px;font-size:69px;font-weight:900;letter-spacing:-6px;color:#1f2128;opacity:.045;pointer-events:none}.chapter-card-header{display:flex;align-items:center;justify-content:space-between;position:relative;z-index:1}.chapter-icon{width:41px;height:41px;border-radius:12px;display:grid;place-items:center}.chapter-icon .ico{width:20px;height:20px}.chapter-count{color:#a5a9b0;font-size:11px;font-weight:700}.chapter-card h3{margin:17px 0 6px;font-size:16px;font-weight:820;letter-spacing:-.2px}.chapter-card p{font-size:11px;color:var(--muted);line-height:1.75;margin:0;max-width:250px}.chapter-foot{display:flex;align-items:center;gap:9px;margin-top:17px;font-size:10px;color:#a1a5ad;font-weight:700}.chapter-foot span:last-child{margin-left:auto;color:#797f87}.chip{display:inline-flex;align-items:center;gap:5px;background:var(--paper-2);border:1px solid var(--border);color:#7f858d;border-radius:20px;padding:5px 9px;font-size:10px;font-weight:760;white-space:nowrap}.palette-peach{background:#fff1e9;color:#e67550}.palette-lavender{background:#f1eaff;color:#986bd8}.palette-mint{background:#e7f6ee;color:#339a6b}.palette-blue{background:#e8f0ff;color:#5f84d3}.palette-yellow{background:#fff3d5;color:#b79442}.palette-pink{background:#ffe9f0;color:#d26f9c}.palette-purple{background:#f0eafa;color:#966bd1}.palette-aqua{background:#e5f6f7;color:#269da3}.palette-grayblue{background:#e8edf3;color:#6e8199}.palette-orange{background:#ffeddb;color:#d28b3f}.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.feature-card{padding:19px 21px;border:1px solid var(--border);background:var(--paper);border-radius:16px;display:flex;gap:15px;align-items:center;cursor:pointer;min-height:120px;transition:all .22s}.feature-icon{height:52px;width:52px;display:grid;place-items:center;border-radius:14px;flex:none}.feature-icon .ico{width:24px;height:24px}.feature-body{min-width:0;flex:1}.feature-body h3{margin:0 0 7px;font-size:13px;line-height:1.5;font-weight:800}.feature-body p{margin:0;color:#89909a;font-size:10.5px;line-height:1.6}.feature-foot{display:flex;align-items:center;gap:12px;color:#9b9fa6;font-size:10px;margin-top:10px}.feature-foot .ico{width:12px;height:12px}.feature-go{margin-left:auto;color:#abb0b7}.bottom-promo{margin-top:34px;border-radius:18px;background:#f0eae2;display:flex;align-items:center;justify-content:space-between;gap:15px;padding:22px 25px;position:relative;overflow:hidden}.bottom-promo:after{content:"✳";font-size:130px;color:#eb784a;opacity:.12;position:absolute;right:12%;top:-25px}.bottom-promo h3{font-size:18px;margin:0 0 6px}.bottom-promo p{margin:0;color:#79746e;font-size:11px}.bottom-promo button{position:relative;z-index:1;white-space:nowrap}.footer{display:flex;justify-content:space-between;gap:10px;color:#a5a7ac;font-size:10px;margin:36px 0 0;padding-top:22px;border-top:1px solid var(--border)}.footer strong{color:#e1714f}
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@media (max-width:960px){.top-links{display:none}.brand{min-width:auto}.search-trigger{padding:10px 12px}.header-start{display:none}.shell{grid-template-columns:230px minmax(0,1fr)}.hero{grid-template-columns:1fr;min-height:0}.hero-left{padding:39px 32px}.hero-art{display:none}.hero-title{font-size:43px}.path-grid{grid-template-columns:1fr}.path-card{min-height:115px;padding:17px 18px 16px 77px}.path-icon{position:absolute;left:17px;top:19px}.chapter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.reader-grid{grid-template-columns:minmax(0,1fr)}.toc{display:none}.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.feature-grid{grid-template-columns:1fr}.my-progress{grid-template-columns:1fr}}
@media (max-width:720px){.topbar{height:66px}.topbar-inner{padding:0 16px;gap:11px}.brand-mark{width:37px;height:37px;border-radius:11px}.brand-mark span{font-size:22px}.brand-words strong{font-size:21px}.brand-words small{font-size:7px}.brand{gap:9px}.search-trigger kbd{display:none}.theme-toggle{display:none}.menu-toggle{display:grid}.shell{display:block;min-height:calc(100vh - 66px)}.sidebar{z-index:55;position:fixed;top:66px;bottom:0;left:0;height:auto;width:min(300px,85vw);transform:translateX(-105%);transition:transform .25s;box-shadow:15px 0 50px #0a111a14}.sidebar.open{transform:none}.mobile-overlay.show{display:block;position:fixed;inset:66px 0 0;z-index:50;background:#0f17245e;backdrop-filter:blur(2px)}.main{padding:22px 17px 55px}.hero{border-radius:19px}.hero-left{padding:32px 23px}.hero-title{font-size:clamp(33px,8vw,45px);letter-spacing:-1.5px}.hero-description{font-size:12px}.hero-bottom{gap:15px;margin-top:22px}.hero-stat{font-size:18px}.hero-stat span{font-size:9px}.section-heading{margin:29px 0 15px}.section-heading h2{font-size:20px}.section-more{font-size:11px}.chapter-grid{gap:11px}.chapter-card{padding:16px 15px 15px;min-height:181px}.chapter-card h3{font-size:13px;margin-top:16px}.chapter-card p{font-size:10px}.chapter-foot{font-size:9px}.chapter-icon{width:36px;height:36px}.chapter-icon .ico{height:17px;width:17px}.path-grid{gap:10px}.feature-grid{gap:11px}.footer{flex-direction:column}.page-top h1,.page-h1{font-size:28px}.page-top-side{display:none}.catalog-banner{padding:26px}.catalog-chapters{grid-template-columns:1fr}.chapter-head{padding:25px 25px 27px;min-height:210px}.chapter-head h1{font-size:26px}.chapter-head .head-number{font-size:125px;right:15px;top:29px}.chapter-lessons{gap:9px}.lesson-row{padding:15px 13px;gap:10px}.lesson-row-number{height:34px;width:34px}.lesson-row h3{font-size:12px}.lesson-row p{font-size:10px}.lesson-row-side{gap:6px;display:none}.resource-header{padding:27px 25px}.resource-header h1{font-size:27px}.resource-icon{font-size:52px}.tool-grid{grid-template-columns:1fr}.tool-card{min-height:0}.reader-breadcrumb{margin-bottom:16px;font-size:10px}.article-head h1{font-size:29px;margin-top:16px}.article-subtitle{font-size:13px}.article-actions .meta{width:100%;margin-bottom:2px}.article-content h2{font-size:19px}.key-point{padding:14px 13px}.article-done-card{padding:19px 17px;align-items:stretch;flex-direction:column}.article-done-card .btn{width:100%}.bottom-promo{flex-direction:column;align-items:flex-start;padding:20px}.search-backdrop{padding:8vh 10px 10px}.search-footer{font-size:9px}}
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