:root{--bg: #f4f6f1;--surface: #ffffff;--ink: #151715;--muted: #5d665f;--line: #d9ddd5;--signal: #00a87e;--cyan: #0b8faa;--coral: #dc5a43;--amber: #c99221;--charcoal: #202622;--surface-tint: #eef4ec;--deep: #101512;--radius: 8px;--shadow: 0 24px 80px rgba(25, 34, 30, .12);font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI Variable,Segoe UI,Microsoft YaHei,Noto Sans CJK SC,PingFang SC,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:linear-gradient(180deg,#f4f6f1f5,#f4f6f1),radial-gradient(circle at 8% 12%,rgba(0,168,126,.08),transparent 30%),radial-gradient(circle at 88% 6%,rgba(220,90,67,.08),transparent 28%);color:var(--ink);letter-spacing:0;overflow-x:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}.site-shell{min-height:100vh}.container{width:100%;max-width:1192px;margin:0 auto;padding:0 16px}.nav{position:sticky;top:0;z-index:20;border-bottom:1px solid rgba(217,221,213,.76);background:#f7f8f4db;backdrop-filter:blur(14px)}.nav-inner{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:24px}.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800}.brand-mark{width:28px;height:28px;border-radius:6px;background:linear-gradient(135deg,rgba(255,255,255,.18),transparent 40%),conic-gradient(from 160deg,var(--signal),var(--cyan),var(--coral),var(--signal));box-shadow:0 8px 24px #00a87e38}.nav-links{display:flex;align-items:center;gap:18px;color:var(--muted);font-size:14px}.nav-links a:hover{color:var(--ink)}.hero{min-height:clamp(560px,78vh,760px);display:grid;align-items:end;position:relative;overflow:hidden;color:#fff;background-image:linear-gradient(90deg,#101512e0,#1015129e 48%,#10151247),url(/assets/qingchen-ai-workbench.png);background-size:cover;background-position:center}.hero:after{content:"";position:absolute;inset:auto 0 0;height:38%;pointer-events:none;background:linear-gradient(180deg,transparent,rgba(16,21,18,.78))}.hero-motion{position:absolute;inset:0;pointer-events:none;opacity:.78}.hero-motion span{position:absolute;display:block;border:1px solid rgba(255,255,255,.18);background:#ffffff0a;backdrop-filter:blur(2px);animation:drift 18s ease-in-out infinite}.hero-motion span:nth-child(1){width:34vw;height:34vw;min-width:220px;min-height:220px;right:8%;bottom:12%;border-radius:50%}.hero-motion span:nth-child(2){width:210px;height:132px;right:29%;top:24%;transform:rotate(-7deg);animation-delay:-6s}.hero-motion span:nth-child(3){width:150px;height:150px;left:7%;top:22%;border-radius:8px;transform:rotate(12deg);animation-delay:-11s}.hero-content{position:relative;z-index:1;padding:92px 0 72px;width:min(840px,100%);max-width:100%}.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 18px;color:#ffffffc7;font-size:13px;font-weight:700;text-transform:uppercase}.eyebrow:before{content:"";width:8px;height:8px;border-radius:2px;background:var(--signal)}h1,h2,h3,p{margin-top:0;overflow-wrap:anywhere;word-break:break-word}h1{margin-bottom:16px;font-size:clamp(54px,8vw,112px);line-height:.92;font-weight:900}.hero-lead{max-width:760px;color:#ffffffdb;font-size:clamp(18px,2vw,24px);line-height:1.55;overflow-wrap:anywhere;word-break:break-word}.hero-actions,.inline-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.hero-strip{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px;max-width:720px}.hero-strip span{display:inline-flex;align-items:center;gap:6px;min-height:32px;padding:0 10px;border:1px solid rgba(255,255,255,.18);border-radius:999px;background:#ffffff17;color:#ffffffd1;font-size:13px;font-weight:800}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);color:var(--ink);font-weight:800;font-size:14px;transition:border-color .16s ease,background .16s ease,color .16s ease,transform .16s ease,box-shadow .16s ease}.button.primary{border-color:var(--signal);background:var(--signal);color:#fff}.button.dark{border-color:#ffffff42;background:#ffffff1f;color:#fff}.button:hover{transform:translateY(-1px);box-shadow:0 14px 32px #19221e1f}.band{padding:70px 0;border-bottom:1px solid var(--line)}.band.white{background:var(--surface)}.band:not(.white){background:linear-gradient(180deg,#f4f6f19e,#eef4ecbd)}.section-head{display:flex;align-items:end;justify-content:space-between;width:100%;gap:24px;margin-bottom:28px}.section-head>div{width:100%;min-width:0;max-width:100%}.section-head h2{margin-bottom:8px;font-size:clamp(30px,4vw,48px);line-height:1.05}.section-head p{width:100%;max-width:660px;margin-bottom:0;color:var(--muted);line-height:1.7;overflow-wrap:anywhere;word-break:break-word}.grid{display:grid;gap:18px}.grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.production-grid{display:grid;grid-template-columns:1.1fr 1.1fr 1.25fr;gap:18px}.card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:0 1px #00000008;transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease}.card:hover{border-color:#00a87e61;box-shadow:0 20px 54px #19221e1a}.metric-card{padding:18px;background:linear-gradient(180deg,#fffffff0,#f7faf6f5)}.metric-card strong{display:block;margin-bottom:6px;font-size:clamp(28px,4vw,44px);line-height:1}.metric-card span{display:block;color:var(--muted);line-height:1.45}.project-card{display:grid;min-height:288px;padding:22px;align-content:space-between;position:relative;overflow:hidden;isolation:isolate}.project-card:before{content:"";position:absolute;inset:0 0 auto;height:5px;background:var(--accent, var(--signal))}.project-card:after{content:"";position:absolute;inset:5px 0 auto;height:80px;z-index:-1;background:linear-gradient(180deg,color-mix(in srgb,var(--accent, var(--signal)) 18%,transparent),transparent)}.project-card:hover{transform:translateY(-3px)}.project-meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}.pill{display:inline-flex;align-items:center;gap:5px;min-height:26px;padding:0 9px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:12px;font-weight:700}.project-card h3{margin-bottom:12px;font-size:24px;line-height:1.18}.project-card p,.skill-card p,.timeline-item p{color:var(--muted);line-height:1.65;overflow-wrap:anywhere;word-break:break-word}.skill-card{padding:20px}.skill-card:hover{transform:translateY(-2px)}.production-card,.stack-card,.prompt-card,.prompt-detail-card{padding:20px}.production-card{display:grid;min-height:276px;align-content:start;position:relative;overflow:hidden}.production-card:before{content:"";position:absolute;inset:0 0 auto;height:4px;background:linear-gradient(90deg,var(--signal),var(--cyan),var(--coral))}.case-icon{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;margin-bottom:18px;border-radius:var(--radius);background:var(--surface-tint);color:var(--signal)}.case-proof{margin-bottom:8px;color:var(--coral);font-size:13px;font-weight:900}.production-card h3,.stack-card h3,.prompt-card h3{margin-bottom:12px;font-size:22px;line-height:1.2}.production-card p,.stack-card p,.prompt-card p,.prompt-detail-card p{color:var(--muted);line-height:1.65}.stack-card svg,.prompt-card svg{margin-bottom:14px;color:var(--signal)}.stack-card strong{color:var(--ink)}.prompt-detail-card h2{margin:16px 0 10px;font-size:clamp(24px,3vw,34px);line-height:1.12}.prompt-detail-top{display:flex;flex-wrap:wrap;gap:8px}.prompt-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:18px}.prompt-columns h3{margin-bottom:8px;font-size:15px}.prompt-columns ul{margin:0;padding-left:18px;color:var(--muted);line-height:1.65}.snippet-box{margin-top:18px;padding:14px;border:1px solid var(--line);border-radius:var(--radius);background:#f5f8f2}.snippet-box strong{display:block;margin-bottom:6px}.snippet-box p{margin-bottom:0}.skill-top{display:flex;justify-content:space-between;gap:14px;margin-bottom:14px}.skill-top h3{margin-bottom:0;font-size:20px;line-height:1.25}.score{color:var(--signal);font-weight:900}.meter{height:8px;overflow:hidden;border-radius:999px;background:#e7ebe4}.meter span{display:block;height:100%;width:var(--value);background:linear-gradient(90deg,var(--signal),var(--cyan),var(--amber))}.tool-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.chart-panel{min-height:420px;padding:18px;background:linear-gradient(180deg,#fffffffa,#f3f8f5eb)}.chart-shell{width:100%;min-height:360px}.timeline{display:grid;gap:0;border-top:1px solid var(--line)}.timeline-item{display:grid;grid-template-columns:120px 1fr;gap:22px;padding:24px 0;border-bottom:1px solid var(--line)}.timeline-item time{color:var(--coral);font-weight:900}.media-tile{overflow:hidden}.media-frame{position:relative;overflow:hidden;background:var(--deep)}.media-frame img,.media-tile>img{width:100%;aspect-ratio:16 / 10;object-fit:cover;transition:transform .42s ease,filter .42s ease}.media-frame svg{position:absolute;right:14px;bottom:14px;color:#fff;filter:drop-shadow(0 10px 24px rgba(0,0,0,.35))}.media-tile:hover img{transform:scale(1.035);filter:saturate(1.08)}.media-tile div{padding:18px}.media-tile .media-frame{padding:0}.privacy-note{margin:14px 0 0;color:var(--muted);font-size:13px;line-height:1.55}.prose{max-width:820px;color:var(--charcoal);line-height:1.78;font-size:17px;overflow-wrap:anywhere;word-break:break-word}.prose h2{margin-top:42px;font-size:30px}.prose h3{margin-top:28px}.prose ul{padding-left:22px}.project-gallery{margin-top:52px}.project-gallery h2{margin-bottom:18px}.media-frame video{display:block;width:100%;aspect-ratio:16 / 10;object-fit:cover;background:var(--deep)}.project-hero{padding:72px 0 48px;border-bottom:1px solid var(--line);background:var(--surface)}.project-hero h1{color:var(--ink);font-size:clamp(42px,6vw,78px)}.project-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:48px;padding:56px 0}.sidebar{align-self:start;padding:20px}.sidebar dl{display:grid;gap:14px;margin:0}.sidebar dt{color:var(--muted);font-size:12px;font-weight:800;text-transform:uppercase}.sidebar dd{margin:4px 0 0;line-height:1.45}.footer{padding:42px 0;background:var(--charcoal);color:#ffffffc7}@keyframes drift{0%,to{transform:translateZ(0) rotate(0)}50%{transform:translate3d(14px,-18px,0) rotate(4deg)}}.footer strong{color:#fff}@media(max-width:900px){.nav-inner{align-items:flex-start;flex-direction:column;padding:12px 0}.nav-links{width:100%;overflow-x:auto;padding-bottom:4px}.grid.cols-2,.grid.cols-3,.grid.cols-4,.production-grid,.prompt-columns,.project-layout{grid-template-columns:1fr}.section-head{align-items:start;flex-direction:column}.section-head h2,.section-head p{max-width:100%}.hero{min-height:620px;background-position:58% center}.hero-content{width:min(100%,560px)}.hero-lead{max-width:100%;font-size:17px;line-height:1.6;word-break:break-all}.timeline-item{grid-template-columns:1fr;gap:8px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.001ms!important}}@media(max-width:560px){.container{padding:0 11px}.hero-content{padding-bottom:54px;width:min(100%,280px)}.hero-lead,.section-head p,.section-head h2,.project-card p,.skill-card p,h1,h2,h3{word-break:break-all}.band{padding:48px 0}.button{width:100%}}