:root{--red:#e32b23;--ink:#161616;--muted:#696b72;--line:#e2e3e5;--gray:#f3f4f5;--serif:Georgia,"Songti SC","STSong",serif;--sans:"PingFang SC","Microsoft YaHei",Arial,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:82px}body{margin:0;background:#fff;color:var(--ink);font:15px/1.75 var(--sans);letter-spacing:0}img{display:block;max-width:100%}a{color:inherit;text-decoration:none}h1,h2,h3,p,figure{margin:0}button{font:inherit;color:inherit}h1,h2,h3{line-height:1.3}a,button,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--red);outline-offset:6px}.wrap{width:min(1200px,calc(100% - 96px));margin-inline:auto}.skip-link{position:fixed;top:0;left:20px;z-index:100;background:var(--ink);color:white;padding:12px;transform:translateY(-120%)}.skip-link:focus{transform:none}.reading-progress{position:fixed;top:0;left:0;width:100%;height:2px;z-index:100;background:var(--red);transform:scaleX(0);transform-origin:left;pointer-events:none}
.site-header{border-bottom:1px solid var(--line);background:#fff;position:relative;z-index:20}.header-inner{min-height:78px;display:flex;justify-content:space-between;align-items:center;gap:32px}.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}.brand img{width:38px;height:38px;object-fit:contain}.brand>span{font:700 28px/1 var(--serif)}.brand b{color:var(--red)}nav{display:flex;gap:28px;align-items:center}nav a{font-size:13px;padding-block:14px;position:relative}nav a::after{content:"";position:absolute;bottom:7px;left:0;right:0;height:1px;background:var(--red);transform:scaleX(0);transform-origin:left;transition:transform .2s}nav a:hover::after{transform:scaleX(1)}.menu-toggle{display:none;width:40px;height:40px;border:0;background:transparent;cursor:pointer}.menu-toggle span{display:block;width:20px;height:1px;background:var(--ink);margin:6px auto;transition:transform .2s}
.hero{position:relative;height:min(670px,calc(100svh - 158px));min-height:530px;display:flex;align-items:center;isolation:isolate}.hero-copy{position:relative;z-index:2;width:48%;padding:32px 0 44px}.hero h1{font:700 110px/1 var(--serif)}.hero h1 span{color:var(--red)}.hero h2{font:600 38px/1.45 var(--serif);margin-top:18px}.hero-copy>p{font-size:16px;line-height:1.85;color:var(--muted);margin-top:24px}.hero-actions{display:flex;gap:30px;align-items:center;margin-top:28px}.button{display:inline-flex;min-height:46px;padding:10px 22px;align-items:center;justify-content:space-between;gap:24px;border:1px solid transparent;font-size:13px;border-radius:3px;transition:background .2s,transform .2s}.primary{color:#fff;background:var(--red)}.primary:hover{background:#bd1917;transform:translateY(-2px)}.line-link{font-size:13px;display:inline-flex;gap:18px;align-items:center;border-bottom:1px solid #aaa;padding-bottom:5px}.line-link:hover{color:var(--red);border-color:var(--red)}.social{display:inline-flex;gap:9px;font-size:12px;margin-top:26px}.social span{color:var(--muted)}.hero-portrait{position:absolute;z-index:1;right:-14px;top:0;bottom:0;width:53%;display:flex;justify-content:center;align-items:center;pointer-events:none}.hero-portrait img{width:100%;height:100%;object-fit:contain;object-position:center;animation:portrait-arrive 1.1s cubic-bezier(.2,.8,.2,1) both}.disciplines{min-height:66px;border-block:1px solid var(--line);display:flex;justify-content:center;align-items:center;gap:40px;font:14px var(--serif)}.disciplines i{font-style:normal;color:#c6c6c6}
.section{padding-block:70px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:32px;margin-bottom:34px}.section-no{font-size:12px;color:var(--red);display:block;margin-bottom:5px}.section-heading h2{font:600 34px/1.3 var(--serif)}.section-heading p{font-size:13px;color:var(--muted);margin-top:10px}.research-layout{display:grid;grid-template-columns:1fr 1.2fr;gap:64px}.feature{padding-right:32px;border-right:1px solid var(--line)}.feature-top{display:flex;align-items:center;gap:10px;margin-bottom:16px}.feature-top img{width:34px;height:34px;object-fit:contain}.feature-top>span{color:var(--red);font-size:12px}.feature h3{font:600 28px/1.4 var(--serif)}.feature .feature-subtitle{color:var(--ink);font-size:15px;margin-block:10px 14px}.feature>p{font-size:13px;color:var(--muted);line-height:1.85}.risk-list{display:flex;flex-wrap:wrap;gap:7px 14px;margin-top:20px;font-size:11px;color:#666}.risk-list span::before{content:"/";color:var(--red);margin-right:5px}.research-topics{display:grid;grid-template-columns:1fr 1fr;gap:0 28px;align-content:start}.research-topics details{border-bottom:1px solid var(--line);padding-block:16px}.research-topics summary{list-style:none;display:flex;align-items:center;gap:12px;cursor:pointer;font-size:14px;min-height:48px}.research-topics summary::-webkit-details-marker{display:none}.research-topics summary>span{font-size:11px;color:var(--red)}.research-topics summary i{margin-left:auto;font:18px Arial;transition:transform .2s}.research-topics details[open] i{transform:rotate(45deg)}.research-topics details[open] summary{color:var(--red)}.research-topics details>p{font-size:12px;line-height:1.85;color:var(--muted);padding:0 0 8px 25px}.about-note{display:grid;grid-template-columns:1fr 2.2fr;gap:32px;border-top:1px solid var(--line);padding-top:26px;margin-top:36px}.about-note h3{font-size:16px;font-weight:500}.about-note p{font-size:13px;color:var(--muted)}
.gray{background:var(--gray)}.tools-grid{display:grid;grid-template-columns:1fr 1fr;column-gap:64px}.tool{display:grid;grid-template-columns:28px 1fr 20px;gap:16px;align-items:start;padding-block:25px;border-bottom:1px solid #d8dade;min-width:0;transition:color .2s}.tool h3{font-size:17px;font-weight:600;margin-bottom:8px}.tool p{font-size:13px;color:var(--muted);max-width:450px;line-height:1.75}.item-no{font:13px/1.8 var(--serif)}.arrow{align-self:center;font-size:22px;transition:transform .2s}.tool:hover h3{color:var(--red)}.tool:hover .arrow{transform:translate(3px,-3px);color:var(--red)}
.dark{background:var(--ink);color:#fff}.dark .section-heading p{color:#9d9ea4}.outline{border-color:#68686d}.outline:hover{border-color:var(--red);background:var(--red)}.repo-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 64px}.repo-grid>a{display:grid;grid-template-columns:26px minmax(0,1fr) 18px;gap:16px;border-top:1px solid #3a3a3d;padding:22px 0}.repo-grid h3{font:500 14px/1.5 var(--sans);overflow-wrap:anywhere}.repo-grid p{font-size:12px;color:#9d9ea4;margin-top:4px}.repo-grid>a>span{font:12px/1.8 var(--serif);color:#b6b6bd}.repo-grid i{font-style:normal}.repo-grid a:hover h3,.repo-grid a:hover i{color:#ff665f}
.flow-intro{display:grid;grid-template-columns:1.2fr 1fr;gap:64px;align-items:center}.flow-intro h2{font:700 64px/1.15 var(--serif)}.flow-intro h3{font-size:20px;color:var(--red);font-weight:500;margin-top:15px}.flow-intro p{font-size:14px;color:var(--muted);margin-bottom:18px}.flow-steps{display:grid;grid-template-columns:repeat(3,1fr);margin-top:42px}.flow-steps article{border-left:1px solid var(--line);padding:0 28px;position:relative}.flow-steps article:first-child{border-left:0;padding-left:0}.flow-steps article>span{font:32px var(--serif)}.flow-steps h3{font-size:16px;margin:12px 0 8px}.flow-steps p{font-size:13px;color:var(--muted)}
.course-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px}.course{min-width:0}.cover{position:relative;overflow:hidden;aspect-ratio:1672/941;border-radius:4px;background:#e8e9eb}.cover img{width:100%;height:100%;object-fit:cover;transition:transform .5s cubic-bezier(.2,.8,.2,1)}.cover>span{position:absolute;right:8px;bottom:8px;width:26px;height:26px;background:rgba(22,22,22,.85);color:#fff;text-align:center;font-size:17px;line-height:26px}.course:hover img{transform:scale(1.045)}.course-title{display:flex;gap:10px;align-items:baseline;margin-top:15px}.course-title>span{font-size:11px;color:var(--red);flex:none}.course-title h3{font-size:14px;line-height:1.6;font-weight:500}.course:hover h3{color:var(--red)}.course>p{color:var(--muted);font-size:12px;margin-top:5px}.more-courses{margin-top:30px}
footer{padding-block:36px 22px}.footer-main{display:flex;align-items:center;justify-content:space-between;gap:24px}.email{font-size:16px;display:flex;align-items:center;gap:28px}.email:hover{color:#ff665f}.footer-bottom{margin-top:28px;padding-top:20px;border-top:1px solid #343438;display:flex;justify-content:space-between;gap:20px;font-size:11px;color:#a0a0a5}
@keyframes portrait-arrive{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
@media(min-width:1500px){.hero h1{font-size:118px}.hero h2{font-size:42px}}
@media(max-width:1100px){.wrap{width:calc(100% - 64px)}.hero h1{font-size:90px}.hero h2{font-size:32px}.hero-copy>p{font-size:15px}.research-layout{gap:32px}.research-topics{grid-template-columns:1fr}.research-topics details{padding-block:4px}.research-topics summary{min-height:44px}.section-heading h2{font-size:30px}.tools-grid,.repo-grid{column-gap:32px}.course-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:30px}.flow-intro{gap:32px}.flow-intro h2{font-size:56px}}
@media(max-width:760px){html{scroll-padding-top:20px}.wrap{width:calc(100% - 40px)}.header-inner{min-height:66px}.brand>span{font-size:25px}.brand img{width:32px;height:32px}.menu-toggle{display:block}.site-header nav{display:none;position:absolute;top:66px;right:0;left:0;padding:18px 20px;background:#fff;border-bottom:1px solid var(--line);grid-template-columns:repeat(3,1fr);gap:8px 20px}.site-header nav.open{display:grid}.menu-toggle[aria-expanded="true"] span:first-child{transform:translateY(3.5px) rotate(45deg)}.menu-toggle[aria-expanded="true"] span:last-child{transform:translateY(-3.5px) rotate(-45deg)}.hero{height:auto;min-height:0;display:grid;grid-template-columns:1fr;position:relative}.hero-copy{width:100%;padding:34px 0 0}.hero h1{font-size:66px}.hero h2{font-size:26px;margin-top:10px}.hero-copy>p{margin-top:16px;font-size:14px}.hero-copy>p br{display:none}.hero-actions{margin-top:22px;gap:25px}.social{margin-top:16px}.hero-portrait{position:relative;right:auto;top:auto;bottom:auto;width:100%;height:300px;margin-top:5px}.hero-portrait img{object-position:center}.disciplines{min-height:52px;gap:18px;font-size:11px}.section{padding-block:44px}.section-heading{align-items:start;gap:18px;margin-bottom:25px}.section-heading h2{font-size:27px}.section-heading>.line-link{font-size:11px;gap:7px;margin-top:22px;flex-shrink:0}.section-heading>p{max-width:135px;font-size:11px;margin-top:25px}.research-layout{grid-template-columns:1fr;gap:24px}.feature{padding:0 0 25px;border-right:0;border-bottom:1px solid var(--line)}.feature h3{font-size:25px}.research-topics{grid-template-columns:1fr 1fr;gap:0 18px}.research-topics summary{font-size:12px;gap:6px}.research-topics summary>span{font-size:10px}.about-note{grid-template-columns:1fr;gap:12px;margin-top:25px}.tools-grid,.repo-grid{grid-template-columns:1fr}.tool{gap:12px;padding-block:22px;grid-template-columns:22px 1fr 18px}.tool h3{font-size:16px}.tool p{font-size:12px}.dark .section-heading{flex-direction:column;gap:20px}.outline{font-size:12px}.flow-intro{grid-template-columns:1fr;gap:24px}.flow-intro h2{font-size:48px}.flow-intro h3{font-size:18px}.flow-steps{grid-template-columns:1fr;margin-top:30px}.flow-steps article,.flow-steps article:first-child{padding:18px 0 18px 48px;border-left:0;border-top:1px solid var(--line)}.flow-steps article>span{position:absolute;left:0;top:20px;font-size:24px}.flow-steps h3{margin-top:0}.course-grid{gap:26px 16px}.course-title{gap:7px;margin-top:10px}.course-title h3{font-size:13px}.course>p{font-size:11px}.footer-main{align-items:start;flex-direction:column;gap:24px}.email{font-size:16px}.footer-bottom{font-size:10px}.more-courses{font-size:12px}}
@media(max-width:360px){.wrap{width:calc(100% - 32px)}.hero h1{font-size:56px}.hero h2{font-size:24px}.disciplines{gap:12px}.research-topics{grid-template-columns:1fr}.section-heading{flex-wrap:wrap}.section-heading>.line-link{margin-top:0}.email{font-size:14px}.course-title{display:block}.course-title>span{display:block;margin-bottom:4px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}