:root{--paper:#f4f7fa;--white:#fff;--mist:#eaf1f6;--mint:#e9f8f8;--navy:#102e46;--deep:#163c57;--cyan:#13b8c5;--blue:#237bd3;--heading:#18364b;--text:#344c60;--muted:#64798a;--line:#dce6ed;--footer:#0b2539}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:22px}body{margin:0;background:var(--paper);color:var(--text);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;font-size:16px;line-height:1.8}a{color:#1769a8;text-decoration:none}a:hover{text-decoration:underline}button{font:inherit}img{max-width:100%;height:auto}h1,h2,h3{color:var(--heading);line-height:1.38;margin:0 0 18px;font-weight:750}h1{font-size:35px}h2{font-size:27px}h3{font-size:20px}p{margin:0 0 17px}section{scroll-margin-top:24px}.container{width:min(1200px,calc(100% - 56px));margin-inline:auto}.section-space{margin-block:60px}.section-head{max-width:790px;margin-bottom:24px}.section-head p,.intro{font-size:17px;line-height:1.82}.eyebrow{font-size:13px;font-weight:700;letter-spacing:.13em;color:#167b90;text-transform:uppercase;display:inline-block;margin-bottom:11px}.muted{color:var(--muted)}.site-header{position:relative;z-index:20}.brand-bar{background:var(--white);border-bottom:1px solid var(--line)}.brand-layout{height:72px;display:flex;align-items:center;gap:22px}.brand-link{flex:none;display:flex;align-items:center;min-width:0;color:var(--heading)}.brand-link img{display:block;width:auto;height:auto;max-height:38px;max-width:250px;object-fit:contain}.logo-fallback{font-size:23px;line-height:1.1}.logo-fallback small{display:block;letter-spacing:.13em;font-size:10px}.brand-description{font-size:13px;color:var(--muted)}.register-link{margin-left:auto;display:inline-flex;align-items:center;justify-content:center;min-height:42px;border-radius:8px;padding:0 22px;background:var(--deep);color:white;font-size:14px;font-weight:bold;white-space:nowrap}.register-link:hover{background:#225475;color:#fff;text-decoration:none}.desktop-nav{background:var(--navy)}.nav-grid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:0}.desktop-nav a{text-align:center;padding:12px 4px 13px;color:#e7f3fa;font-size:14px;white-space:nowrap;border-bottom:3px solid transparent;font-weight:600}.desktop-nav a:hover,.desktop-nav a.is-current{border-color:var(--cyan);color:#fff;text-decoration:none}.menu-button,.no-script-nav{display:none}.skip-link{position:absolute;top:-100px;left:15px;padding:12px;background:#fff;z-index:50}.skip-link:focus{top:10px}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:3px}.mobile-drawer,.drawer-overlay{visibility:hidden;pointer-events:none}.hero{background:var(--white);border-bottom:1px solid var(--line);padding:55px 0}.hero-layout{display:grid;grid-template-columns:minmax(0,52fr) minmax(0,48fr);gap:35px;align-items:center}.hero h1{font-size:42px}.hero p{max-width:650px}.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}.button-link{display:inline-flex;align-items:center;min-height:43px;padding:8px 19px;border-radius:8px;background:var(--deep);color:white;font-weight:700}.button-link.secondary{background:var(--mint);color:var(--heading);border:1px solid #bde4e5}.button-link:hover{text-decoration:none;filter:brightness(1.07)}.media-frame{display:flex;align-items:center;justify-content:center;min-width:0;width:100%;margin:0;padding:9px;border-radius:14px;background:var(--mist);border:1px solid var(--line)}.media-frame img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--media-limit,220px);object-fit:contain;object-position:center}.media-placeholder{min-width:130px;min-height:100px;max-width:100%;width:100%;background:linear-gradient(135deg,#edf4f8,#dae8ef);border:1px dashed #c3d6e1;border-radius:8px}.media-frame--hero{--media-limit:310px}.media-frame--feature{--media-limit:250px}.media-frame--card{--media-limit:185px}.media-frame--banner{--media-limit:210px}.media-frame--mobile{--media-limit:350px;max-width:320px}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px;border-top:2px solid var(--deep)}.topic-item{border-bottom:1px solid var(--line);padding:22px 0;display:grid;grid-template-columns:38px 1fr;gap:12px}.topic-item .number{color:#13879b;font-size:15px;font-weight:800}.topic-item h3{margin-bottom:8px}.topic-item p{margin-bottom:8px;font-size:15px}.feature-pair{display:grid;grid-template-columns:2fr 1fr;gap:22px}.feature-major{background:var(--deep);border-radius:14px;padding:30px;color:#eaf6fb}.feature-major h3,.feature-major h2{color:#fff}.feature-major a{color:#9beaf0}.feature-side{display:flex;flex-direction:column;gap:16px}.feature-side article{background:var(--white);border:1px solid var(--line);padding:22px;border-radius:12px;flex:1}.split-band{display:grid;grid-template-columns:1fr 1.15fr;gap:32px;align-items:center;background:var(--white);border:1px solid var(--line);border-radius:16px;padding:26px}.split-band.reverse{grid-template-columns:1.15fr 1fr}.split-band h2{margin-bottom:14px}.soft-section{background:var(--mint);padding:44px 0}.triple-text{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.text-tile{background:#fff;border:1px solid var(--line);border-top:4px solid var(--cyan);padding:24px;border-radius:10px}.text-tile:nth-child(2){transform:translateY(12px)}.text-tile:nth-child(3){transform:translateY(24px)}.reading-route{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;counter-reset:route}.route-step{padding:20px;background:#fff;border-left:3px solid var(--cyan);border-radius:8px;counter-increment:route}.route-step:before{content:'0' counter(route);display:block;color:#138a9b;font-size:22px;font-weight:800}.editor-note{padding:22px;border-left:4px solid var(--blue);background:#fff;margin-top:40px}.page-hero{padding:48px 0 32px;background:var(--white);border-bottom:1px solid var(--line)}.page-hero .intro{max-width:830px;margin-bottom:0}.breadcrumb{font-size:13px;margin-bottom:17px;color:var(--muted)}.breadcrumb a{color:var(--muted)}.anchor-nav{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.anchor-nav a{background:var(--mist);color:var(--heading);padding:8px 13px;border-radius:7px;font-weight:700;font-size:14px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:40px;align-items:start}.article-column{min-width:0;max-width:800px}.article-column section{margin-bottom:46px}.sidebar{position:sticky;top:24px;background:#fff;padding:22px;border:1px solid var(--line);border-radius:12px}.sidebar ul{padding-left:18px}.sidebar li{margin-bottom:9px}.prose{max-width:800px}.prose h2{margin-top:30px}.prose h3{margin-top:22px}.prose p{line-height:1.82}.panel{background:#fff;border:1px solid var(--line);padding:24px;border-radius:12px}.callout{background:var(--mint);padding:20px 23px;border-left:4px solid var(--cyan);margin:18px 0}.number-steps{counter-reset:steps;display:grid;gap:13px}.number-steps article{counter-increment:steps;background:#fff;padding:20px 22px 20px 65px;border:1px solid var(--line);border-radius:10px;position:relative}.number-steps article:before{content:counter(steps);position:absolute;top:18px;left:20px;width:32px;height:32px;background:var(--deep);color:#fff;display:grid;place-items:center;border-radius:50%;font-weight:700}.number-steps h3{margin-bottom:7px}.full-table{margin:28px 0;overflow-x:auto;border:1px solid var(--line);border-radius:10px}.full-table table{width:100%;border-collapse:collapse;min-width:590px;background:white;font-size:15px}.full-table caption{text-align:left;font-size:18px;font-weight:750;color:var(--heading);padding:17px 20px}.full-table th,.full-table td{padding:14px 16px;border-top:1px solid var(--line);text-align:left;vertical-align:top}.full-table th{background:var(--mist);color:var(--heading)}.reading-links{margin:44px 0;padding:25px;border-top:3px solid var(--cyan);background:#fff}.reading-link-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.reading-link-grid a{border-bottom:1px solid var(--line);padding:9px 3px;font-weight:700}.matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.matrix .panel h3{font-size:20px}.chapter-band{padding:40px 0;border-bottom:1px solid var(--line)}.chapter-band:nth-child(even){background:#fff}.chapter-band .container{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:38px;align-items:center}.chapter-band .container>div{min-width:0}.gallery-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}.gallery-item{background:white;padding:19px;border:1px solid var(--line);border-radius:12px}.gallery-item:nth-child(even){margin-top:35px}.gallery-item h3{margin-top:14px}.mini-label{font-size:13px;font-weight:800;color:#167b90}.rule-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:34px;align-items:start}.rule-nav{position:sticky;top:25px;background:#fff;border:1px solid var(--line);padding:19px;border-radius:12px}.rule-nav a{display:block;padding:9px 3px;border-bottom:1px solid var(--line)}.rule-content{max-width:850px;min-width:0}.rule-content>section{margin-bottom:45px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:9px;margin:9px 0;padding:0 17px}.faq-list summary{padding:13px 4px;cursor:pointer;font-weight:700;color:var(--heading)}.faq-list details p{border-top:1px solid var(--line);padding:12px 4px;margin:0}.about-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:38px}.about-sidebar{align-self:start;background:#eaf1f6;padding:22px;border-radius:11px}.about-sidebar a{display:block;margin:9px 0}.about-main{min-width:0}.about-main section{margin-bottom:43px}.mobile-quick{display:none}.site-footer{background:var(--footer);color:#dcecf5;margin-top:55px;padding:46px 0 18px}.footer-layout{display:grid;grid-template-columns:1.5fr 1fr;gap:65px}.footer-brand{font-size:25px;font-weight:800}.footer-brand span{font-size:12px;letter-spacing:.1em}.footer-layout nav{display:grid;grid-template-columns:1fr 1fr;gap:10px;align-content:start}.footer-layout a{color:#e8f7fc;font-size:14px}.footer-disclaimer{font-size:13px;color:#c4d8e2}.footer-bottom{border-top:1px solid #365164;padding-top:15px;margin-top:25px;font-size:12px;color:#a4bdca}.back-to-top{position:fixed;right:19px;bottom:20px;width:43px;height:43px;background:var(--deep);color:#fff;border:0;border-radius:50%;cursor:pointer;z-index:12}.back-to-top[hidden]{display:none}.phase-flow{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.phase-flow span{padding:12px 15px;border-radius:8px;background:var(--mist);color:var(--heading);font-weight:700}.phase-flow b{color:#168e9d}
@media(max-width:1100px){.container{width:calc(100% - 44px)}.brand-description{display:none}.section-space{margin-block:50px}}
@media(max-width:920px){.brand-layout{height:63px;display:grid;grid-template-columns:42px minmax(0,1fr) auto;gap:10px}.brand-link{justify-self:center;max-width:100%}.brand-link img{max-height:29px;max-width:min(37vw,190px)}.logo-fallback{font-size:18px}.logo-fallback small{font-size:8px}.register-link{margin:0;padding:0 12px;min-height:39px;font-size:13px}.desktop-nav{display:none}.menu-button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;width:40px;height:40px;background:transparent;border:1px solid var(--line);border-radius:8px;cursor:pointer}.menu-button span{width:19px;height:2px;background:var(--heading)}.drawer-overlay{position:fixed;inset:0;background:rgba(5,22,35,.54);opacity:0;transition:opacity .2s;z-index:40}.drawer-overlay.open{visibility:visible;pointer-events:auto;opacity:1}.mobile-drawer{position:fixed;left:0;top:0;bottom:0;width:min(86vw,340px);z-index:41;background:#fff;transform:translateX(-102%);transition:transform .22s;overflow:auto;box-shadow:8px 0 30px #0b253922}.mobile-drawer.open{visibility:visible;pointer-events:auto;transform:translateX(0)}.drawer-heading{display:flex;align-items:center;justify-content:space-between;padding:19px;border-bottom:1px solid var(--line)}.drawer-close{width:42px;height:42px;border:1px solid var(--line);background:#fff;border-radius:8px;font-size:27px;line-height:1}.drawer-group{font-size:12px;color:var(--muted);margin:18px 18px 4px;font-weight:700}.mobile-drawer nav a{display:block;padding:11px 20px;border-bottom:1px solid var(--line);color:var(--heading);font-weight:600}body.drawer-open{overflow:hidden}.no-script-nav{display:block;background:var(--mist)}.no-script-nav nav{display:none}.no-script-nav nav a{display:inline-block;padding:8px 10px}body:not(:has(.mobile-drawer.open)) .mobile-drawer{pointer-events:none}.mobile-quick{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;padding:22px 0}.mobile-quick a{font-size:13px;color:var(--heading)}.hero h1{font-size:36px}}
@media(max-width:920px){.no-script-nav{display:none}}
@media(max-width:760px){.container{width:calc(100% - 40px)}.hero-layout,.feature-pair,.split-band,.split-band.reverse,.article-layout,.chapter-band .container,.rule-layout,.about-layout,.footer-layout{grid-template-columns:minmax(0,1fr)}.sidebar,.rule-nav{position:static}.about-main{order:0}.about-sidebar{order:1}.matrix{grid-template-columns:1fr 1fr}.hero{padding:35px 0}.feature-side{display:grid;grid-template-columns:1fr 1fr}.gallery-grid{gap:16px}.reading-link-grid{grid-template-columns:1fr 1fr}.footer-layout{gap:22px}.section-space{margin-block:40px}}
@media(max-width:640px){body{font-size:15px}.container{width:calc(100% - 32px)}h1{font-size:27px}h2{font-size:22px}h3{font-size:18px}.hero h1{font-size:30px}.section-head p,.intro{font-size:15px}.page-hero{padding:30px 0 26px}.hero-layout{gap:24px}.hero p{font-size:15px}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--banner{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px}.topic-list,.triple-text,.reading-route,.matrix,.gallery-grid,.reading-link-grid,.feature-side{grid-template-columns:1fr}.gallery-item:nth-child(even){margin-top:0}.text-tile:nth-child(2),.text-tile:nth-child(3){transform:none}.topic-item{padding:17px 0}.feature-major,.split-band,.panel{padding:19px}.chapter-band{padding:29px 0}.soft-section{padding:31px 0}.section-space{margin-block:34px}.section-head{margin-bottom:16px}.footer-layout nav{gap:8px}.brand-layout{grid-template-columns:40px minmax(0,1fr) auto}.register-link{padding:0 9px}.logo-fallback{font-size:15px}.logo-fallback small{font-size:7px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition-duration:0.01ms!important;animation-duration:0.01ms!important}}
/* When JavaScript is disabled, retain an ordinary, always-usable link list. */