:root{--blue:#1478F2;--bright:#348FFF;--deep:#0765D4;--navy:#094D9E;--ink:#17243A;--text:#3C495D;--muted:#6E7988;--soft:#99A2AF;--sub:#F7FAFE;--pale:#EDF5FF;--softblue:#E3F0FF;--gray:#F4F6F9;--border:rgba(20,120,242,.12);--neutral:rgba(20,40,70,.08);--shadow:0 14px 38px rgba(35,72,118,.08);--brandshadow:0 16px 44px rgba(20,120,242,.14);--head:72px;--max:1320px}*{box-sizing:border-box}html{overflow-x:hidden;scroll-behavior:smooth}body{margin:0;overflow-x:hidden;background:#fff;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.72}body.panel-open{overflow:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}a,button,input,summary{outline:none}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid rgba(20,120,242,.24);outline-offset:3px}img{max-width:100%;height:auto;display:block}.site-header{position:sticky;top:0;z-index:90;height:var(--head);background:rgba(255,255,255,.96);border-bottom:1px solid var(--neutral);backdrop-filter:blur(14px)}.nav-shell{height:100%;max-width:var(--max);margin:auto;padding:0 24px;display:flex;align-items:center;gap:18px}.brand{display:flex;align-items:center;min-width:max-content}.brand-logo{max-width:176px;max-height:44px;object-fit:contain}.brand-fallback{display:flex;flex-direction:column;background:var(--blue);color:#fff;padding:7px 11px;border-radius:8px;line-height:1}.brand-fallback strong{font-size:18px;letter-spacing:.08em}.brand-fallback small{font-size:8px;letter-spacing:.15em;margin-top:5px}.desktop-nav{display:flex;gap:2px;flex:1;white-space:nowrap}.desktop-nav a,.text-nav{position:relative;display:flex;align-items:center;justify-content:center;min-height:44px;padding:0 11px;border-radius:10px;font-size:14px}.desktop-nav a:hover,.text-nav:hover{background:var(--pale);color:var(--blue)}.desktop-nav a.active,.text-nav.active{color:var(--blue);font-weight:800}.desktop-nav a.active:after,.text-nav.active:after{content:"";position:absolute;left:50%;bottom:4px;width:5px;height:5px;background:var(--blue);border-radius:50%;transform:translateX(-50%)}.nav-actions{display:flex;align-items:center;gap:5px;margin-left:auto}.icon-btn{min-width:44px;min-height:44px;border:1px solid var(--border);background:#fff;color:var(--ink);border-radius:11px;cursor:pointer;padding:0 11px}.icon-btn:hover{background:var(--pale);color:var(--blue)}main{display:block}.content-shell{max-width:var(--max);margin:auto;padding:72px 24px}.hero-simple{background:linear-gradient(180deg,#F7FAFE 0%,#fff 100%);border-bottom:1px solid var(--neutral);padding:80px 0 48px}.hero-simple .content-shell{padding-top:0;padding-bottom:0}.hero-tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}.pill{display:inline-flex;min-height:30px;align-items:center;padding:0 10px;border-radius:999px;background:var(--pale);color:var(--blue);font-size:13px;font-weight:800}.hero-simple h1{font-size:clamp(36px,5vw,68px);letter-spacing:-.04em;margin:0 0 20px;color:var(--ink);line-height:1.08}.lead{max-width:880px;font-size:clamp(17px,2vw,21px);color:var(--muted);margin:0}.section{padding:82px 0}.section.alt{background:var(--sub)}h1,h2,h3{color:var(--ink);line-height:1.2}h2{font-size:clamp(24px,3vw,36px);margin:0 0 14px}h3{font-size:20px;margin:0 0 10px}p{margin:0 0 16px}.number{display:inline-block;color:var(--blue);font-weight:900;letter-spacing:.12em;font-size:13px;margin-bottom:12px}.essay-list{max-width:980px;margin:auto}.essay-list .content-card{padding:0 0 38px;margin-bottom:34px;border-bottom:1px solid var(--neutral)}.content-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.content-grid .content-card{background:#fff;border:1px solid var(--neutral);border-radius:16px;padding:26px;box-shadow:var(--shadow)}.content-grid.map .content-card:nth-child(1){grid-column:span 2;background:linear-gradient(135deg,#E3F0FF,#fff)}.content-grid.board{grid-template-columns:repeat(4,1fr)}.content-grid.board .content-card{border-top:4px solid var(--blue);box-shadow:var(--shadow)}.content-grid.timeline{display:block;max-width:980px;margin:auto;padding-left:42px;border-left:2px solid var(--border)}.content-grid.timeline .content-card{position:relative;border:0;border-radius:0;box-shadow:none;padding:0 0 34px 24px}.content-grid.timeline .content-card:before{content:"";position:absolute;width:14px;height:14px;border-radius:50%;background:#fff;border:4px solid var(--blue);left:-33px;top:4px}.content-grid.tags{grid-template-columns:repeat(2,1fr)}.content-grid.qa{display:block;max-width:1000px;margin:auto}.content-grid.qa .content-card{border:0;border-radius:0;box-shadow:none;border-top:1px solid var(--neutral);padding:30px 0}.content-grid.story .content-card:first-child{grid-row:span 2;background:linear-gradient(150deg,#E8F3FF,#fff)}.content-grid.wall{grid-template-columns:repeat(4,1fr)}.content-grid.wall .content-card:nth-child(1),.content-grid.wall .content-card:nth-child(6){grid-column:span 2;background:var(--pale)}.content-grid.feature{display:block}.content-grid.feature .content-card{display:grid;grid-template-columns:120px 1fr;border:0;border-radius:0;box-shadow:none;border-top:1px solid var(--neutral);padding:34px 0}.content-grid.feature .content-card .number{grid-row:1/20}.content-grid.folder{grid-template-columns:repeat(4,1fr)}.content-grid.folder .content-card{position:relative;padding-top:34px}.content-grid.folder .content-card:before{content:"";position:absolute;left:18px;top:-10px;width:76px;height:18px;background:var(--pale);border:1px solid var(--border);border-bottom:0;border-radius:8px 8px 0 0}.content-grid.bulletin{display:block;max-width:1000px;margin:auto}.content-grid.bulletin .content-card{display:grid;grid-template-columns:110px 1fr;border:0;border-radius:0;box-shadow:none;border-top:1px solid var(--neutral);padding:26px 0}.content-grid.bulletin .content-card .number{grid-row:1/20}.content-grid.principles{grid-template-columns:repeat(3,1fr)}.content-grid.principles .content-card{border-left:4px solid var(--blue)}.content-grid.app .content-card:nth-child(1){grid-column:span 2;background:linear-gradient(135deg,#E3F0FF,#fff)}.content-grid.safety .content-card{border-left:4px solid var(--deep)}.content-grid.help{grid-template-columns:repeat(2,1fr)}.link-strip{display:flex;gap:14px;flex-wrap:wrap}.link-strip a{color:var(--blue);font-weight:800;padding:11px 14px;border:1px solid var(--border);border-radius:10px;background:#fff}.link-strip a:hover{background:var(--pale)}.home-cover{padding:42px 0;background:linear-gradient(140deg,#F8FBFF,#fff 44%,#EDF5FF)}.explore-desk{display:grid;grid-template-columns:28% 47% 25%;max-width:var(--max);margin:auto;padding:0 24px;min-height:560px}.explore-left,.explore-right,.explore-center{padding:28px}.explore-left{display:flex;flex-direction:column;justify-content:center}.brand-name{font-size:13px;color:var(--blue);font-weight:900;letter-spacing:.12em}.explore-left h1{font-size:clamp(38px,4.3vw,62px);line-height:1.05;letter-spacing:-.04em;margin:16px 0 22px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 20px;border-radius:12px;background:linear-gradient(135deg,#43A0FF 0%,#1478F2 56%,#0964CE 100%);color:#fff;font-weight:800;box-shadow:var(--brandshadow)}.btn:hover{filter:brightness(.98)}.text-link{color:var(--blue);font-weight:800}.text-link:hover{text-decoration:underline}.button-row{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-top:24px}.explore-center{position:relative;display:flex;align-items:center;justify-content:center;background:linear-gradient(150deg,#DDEEFF,#F7FBFF 55%,#CFE5FF);border-radius:22px;overflow:hidden;min-height:480px}.explore-center:before,.explore-center:after{content:"";position:absolute;border:1px dashed rgba(20,120,242,.24);border-radius:50%;pointer-events:none}.explore-center:before{width:330px;height:330px}.explore-center:after{width:480px;height:480px}.cover-image{position:relative;z-index:1;max-height:430px;object-fit:contain}.cover-fallback{position:relative;z-index:1;width:80%;padding:42px 30px;border-radius:18px;background:linear-gradient(135deg,#43A0FF,#1478F2 56%,#0964CE);color:#fff;box-shadow:0 28px 65px rgba(20,120,242,.22)}.cover-fallback strong{display:block;font-size:clamp(38px,5vw,66px);line-height:1}.cover-fallback span{display:block;font-size:11px;letter-spacing:.18em;margin-top:10px}.explore-right{display:flex;flex-direction:column;justify-content:center;gap:8px}.discover-item{padding:16px 0;border-bottom:1px solid var(--neutral)}.discover-item h2{font-size:18px;margin-bottom:7px}.discover-item p{font-size:14px;color:var(--muted);margin-bottom:5px}.inline-index{display:flex;gap:22px;overflow-x:auto;padding:16px 24px;border-bottom:1px solid var(--neutral);white-space:nowrap;scrollbar-width:thin}.inline-index a{font-size:14px;color:var(--muted);font-weight:700}.inline-index a:hover,.inline-index a.active{color:var(--blue)}.section-head{max-width:760px;margin-bottom:34px}.section-kicker{font-size:13px;font-weight:900;color:var(--blue);letter-spacing:.1em}.editorial-list{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--neutral);border:1px solid var(--neutral);border-radius:18px;overflow:hidden}.editorial-item{background:#fff;padding:26px;min-height:240px}.editorial-item:nth-child(2n){background:var(--sub)}.dark-safety{background:#091E39;color:#E9F3FF}.dark-safety h2,.dark-safety h3{color:#fff}.safety-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.safety-grid div{padding:18px;border:1px solid rgba(255,255,255,.12);border-radius:12px;background:rgba(255,255,255,.04)}.brand-statement{background:linear-gradient(135deg,#0964CE,#1478F2 52%,#43A0FF);color:#fff}.brand-statement h2{color:#fff;font-size:clamp(32px,4vw,54px)}.page-mask{position:fixed;inset:0;z-index:100;background:rgba(9,30,57,.32);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.page-mask.is-open{opacity:1;visibility:visible;pointer-events:auto}.overlay-panel{position:fixed;left:0;right:0;top:var(--head);z-index:110;background:#fff;max-height:85vh;overflow:auto;transform:translateY(-14px);opacity:0;visibility:hidden;pointer-events:none;transition:.2s;box-shadow:0 24px 60px rgba(9,30,57,.16)}.overlay-panel.is-open{transform:none;opacity:1;visibility:visible;pointer-events:auto}.panel-inner{max-width:var(--max);margin:auto;padding:20px 24px 32px}.panel-head{min-height:54px;display:flex;align-items:center;gap:16px;border-bottom:1px solid var(--neutral);margin-bottom:20px}.panel-head>strong{font-size:20px;color:var(--ink)}.panel-head .icon-btn{margin-left:auto}.panel-brand{display:none}.explore-groups{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}.explore-groups h2,.search-columns h2{font-size:14px;color:var(--blue)}.explore-groups a{display:block;padding:10px 0;border-top:1px solid var(--neutral)}.explore-groups strong{display:block;color:var(--ink);font-size:15px}.explore-groups span{display:block;color:var(--muted);font-size:12px;line-height:1.55;margin-top:3px}.search-box{display:block}.search-box span{display:block;font-size:12px;color:var(--muted);margin-bottom:7px}.search-box input{width:100%;min-height:56px;border:1px solid var(--border);border-radius:14px;padding:0 18px;background:var(--sub)}.search-columns{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:26px}.search-columns a{display:block;padding:9px 0;border-top:1px solid var(--neutral);font-weight:700}.search-columns a[hidden]{display:none}.search-empty{padding:15px;background:var(--pale);border-radius:12px}.site-footer{background:#091E39;color:#E9F3FF;padding:64px 0 calc(28px + env(safe-area-inset-bottom))}.footer-shell{max-width:var(--max);margin:auto;padding:0 24px}.footer-brand{display:grid;grid-template-columns:260px 1fr;gap:40px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.1)}.footer-logo{max-width:200px;max-height:56px;object-fit:contain}.footer-brandmark strong{display:block;color:#fff;font-size:27px}.footer-brandmark small{font-size:10px;letter-spacing:.16em}.footer-brand p,.footer-note{color:#BFD1E6}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;padding:32px 0}.footer-groups h2{font-size:14px;color:#fff}.footer-groups a{display:block;color:#BFD1E6;padding:4px 0}.footer-groups a:hover{color:#fff}.footer-note{padding-top:20px;border-top:1px solid rgba(255,255,255,.1);font-size:13px}.copyright{font-size:12px;color:#8298B1}.mobile-bottom,.mobile-only{display:none}.faq details{border-top:1px solid var(--neutral);padding:19px 0}.faq summary{cursor:pointer;color:var(--ink);font-weight:800;min-height:44px}.faq details p{padding-top:12px;color:var(--muted)}
@media(max-width:1080px){.desktop-nav a,.text-nav{padding:0 7px;font-size:13px}.explore-groups{grid-template-columns:repeat(3,1fr)}.content-grid.board{grid-template-columns:repeat(2,1fr)}.content-grid.wall,.content-grid.folder{grid-template-columns:repeat(2,1fr)}.editorial-list{grid-template-columns:repeat(2,1fr)}}
@media(max-width:900px){:root{--head:64px}.desktop-nav,.desktop-only{display:none!important}.mobile-only{display:inline-flex}.nav-shell{padding:0 15px;justify-content:space-between;gap:8px}.brand{position:absolute;left:50%;transform:translateX(-50%);max-width:48vw}.brand-logo{max-width:150px;max-height:40px}.nav-actions{margin-left:auto}.explore-desk{display:flex;flex-direction:column;padding:0 15px}.explore-left{order:1;padding:34px 0 24px}.explore-center{order:2;min-height:300px}.explore-right{order:3;padding:10px 0 20px}.content-shell{padding:58px 15px}.section{padding:66px 0}.content-grid,.content-grid.tags,.content-grid.help,.content-grid.principles{grid-template-columns:1fr}.content-grid.feature .content-card{grid-template-columns:90px 1fr}.overlay-panel{top:0;bottom:0;height:100dvh;max-height:none}.panel-inner{padding:14px 15px 88px}.panel-head{position:sticky;top:0;background:#fff;z-index:2;margin:-14px -15px 18px;padding:10px 15px}.panel-brand{display:flex;position:static;transform:none;max-width:46vw}.explore-groups,.search-columns{grid-template-columns:1fr 1fr}.mobile-bottom{position:fixed;z-index:95;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(5,1fr);background:rgba(255,255,255,.97);border-top:1px solid var(--neutral);padding-bottom:env(safe-area-inset-bottom)}.mobile-bottom a{min-height:54px;display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--muted)}.mobile-bottom a.active{color:var(--blue);font-weight:800}.site-footer{padding-bottom:calc(86px + env(safe-area-inset-bottom))}.footer-brand{grid-template-columns:1fr;gap:16px}.footer-groups{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.hero-simple h1{font-size:39px}.editorial-list,.content-grid.board,.content-grid.wall,.content-grid.folder{grid-template-columns:1fr}.content-grid.map .content-card:nth-child(1),.content-grid.app .content-card:nth-child(1),.content-grid.wall .content-card:nth-child(1),.content-grid.wall .content-card:nth-child(6){grid-column:auto}.content-grid.feature .content-card,.content-grid.bulletin .content-card{grid-template-columns:1fr;gap:4px}.content-grid.feature .content-card .number,.content-grid.bulletin .content-card .number{grid-row:auto}.explore-groups,.search-columns{grid-template-columns:1fr}.footer-groups{grid-template-columns:1fr 1fr}.safety-grid{grid-template-columns:1fr}.cover-fallback{width:86%}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

.faq-list{max-width:980px;margin:auto}.faq-list details{border-top:1px solid var(--neutral);padding:19px 0}.faq-list summary{cursor:pointer;color:var(--ink);font-weight:800;min-height:44px}.faq-list details p{padding-top:12px;color:var(--muted)}.app-visual{background:var(--sub)}.app-visual .content-shell{padding-top:34px;padding-bottom:34px}.app-visual img{max-height:620px;margin:auto;object-fit:contain;border-radius:18px}