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:root{--bg:#F6FAFC;--surface:#fff;--pale:#EAF6FA;--pale2:#EDF4F8;--cyan:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--navy:#174B78;--heading:#183A56;--body:#31485D;--muted:#687D8E;--line:#DCE9F0;--footer:#123653;--radius:16px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--bg);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--body);font-size:16px;line-height:1.8;overflow-x:hidden}body.menu-open{overflow:hidden}a{color:var(--navy);text-underline-offset:4px}a:hover{color:var(--blue)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}button{font:inherit;cursor:pointer}img{max-width:100%;height:auto}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--heading);line-height:1.38}h1{font-size:36px;letter-spacing:-.025em}h2{font-size:26px}h3{font-size:20px}p{margin-bottom:1.05em}.wrap{width:min(100% - 56px,1180px);margin-inline:auto}.article-width{max-width:780px}.section-space{margin-block:56px}.eyebrow{font-size:13px;font-weight:800;letter-spacing:.13em;color:#147C99;margin-bottom:8px;text-transform:uppercase}.muted{color:var(--muted)}.section-head{margin-bottom:24px}.section-head p:last-child{max-width:760px}.skip-link{position:absolute;left:12px;top:-80px;background:#fff;z-index:200;padding:10px}.skip-link:focus{top:10px}
.site-header{background:#fff;position:relative;z-index:30;border-bottom:1px solid var(--line)}.topline{height:72px;display:flex;align-items:center;gap:20px}.brand{text-decoration:none;display:inline-flex;align-items:center;max-width:270px;min-width:0}.brand .media{background:transparent;border:0;max-width:220px;max-height:38px;min-height:0;height:38px;width:auto;max-width:260px}.brand .media img{height:auto;width:auto;max-height:38px;max-width:250px}.brand .media-placeholder{display:none}.brand-fallback{display:none;color:var(--navy);font-size:20px;font-weight:800;line-height:1}.brand-fallback small{font-size:10px;display:block;letter-spacing:.15em;margin-top:6px}.brand:has(.media-placeholder) .media{display:none}.brand:has(.media-placeholder) .brand-fallback{display:block}.topline-tagline{margin-left:auto;color:var(--muted);font-size:14px;letter-spacing:.06em}.entry-link{margin-left:22px;color:#fff;text-decoration:none;background:linear-gradient(110deg,#1686BD,#174B78);min-height:42px;padding:6px 23px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;white-space:nowrap;font-weight:700}.entry-link:hover{color:#fff;background:#1267A1}.channel-bar{background:var(--navy)}.channel-links{height:48px;display:flex;align-items:stretch;gap:26px}.channel-links a{display:inline-flex;align-items:center;color:#EAF7FF;text-decoration:none;white-space:nowrap;font-size:14px;border-bottom:3px solid transparent;padding-top:3px}.channel-links a:hover,.channel-links a[aria-current=page]{color:#fff;border-bottom-color:var(--cyan)}.menu-toggle{display:none;background:transparent;border:0;padding:8px;width:40px;height:40px}.menu-toggle span{display:block;height:2px;background:var(--navy);margin:5px 0}.drawer-overlay,.mobile-drawer{display:none}
.media{display:flex;justify-content:center;align-items:center;width:100%;min-width:0;overflow:hidden;border-radius:14px;background:var(--pale);border:1px solid var(--line)}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{display:block;width:70%;height:57%;border:1px solid #D1E7EF;border-radius:12px;background:linear-gradient(145deg,#EAF6FA,#DCEFF5)}.media--hero{height:clamp(250px,26vw,330px)}.media--feature{height:250px}.media--card{height:170px}.media--banner{height:220px}.media--mobile{height:350px;max-width:320px}.media--inline{height:220px}.media--wide{height:auto;min-height:120px;max-height:240px;aspect-ratio:2.5/1}.media--portrait.media--mobile{aspect-ratio:4/5}.media--logo{border:0;border-radius:0;background:none;overflow:visible}.media--logo img{max-height:38px}.media--logo .media-placeholder{display:none}
.hero{display:grid;grid-template-columns:minmax(0,56fr) minmax(0,44fr);gap:46px;align-items:center;padding-block:51px 40px}.hero h1{font-size:42px;max-width:680px}.hero .lead{font-size:17px;max-width:650px}.hero .media{box-shadow:0 16px 30px #174B7810}.action-row{display:flex;flex-wrap:wrap;gap:13px;margin-top:24px}.button-link{display:inline-flex;align-items:center;justify-content:center;padding:11px 19px;border-radius:9px;background:var(--navy);color:#fff;text-decoration:none;font-weight:700}.button-link:hover{background:var(--blue);color:#fff}.button-link.secondary{background:#EAF6FA;color:var(--navy);border:1px solid #CDE9F1}.button-link.secondary:hover{background:#D8F0F5}.quick-strip{border-bottom:1px solid var(--line);background:#fff}.quick-inner{display:flex;gap:30px;flex-wrap:wrap;padding-block:12px;font-size:13px}.quick-inner strong{color:var(--heading)}.quick-inner a{margin-left:12px;text-decoration:none}.quick-inner a:hover{text-decoration:underline}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.topic-card{display:block;background:#fff;border:1px solid var(--line);border-radius:13px;padding:20px;text-decoration:none;transition:border-color .15s,transform .15s;min-height:170px}.topic-card:hover{border-color:var(--sky);transform:translateY(-2px)}.topic-card h3{font-size:18px;margin-bottom:9px}.topic-card p{font-size:14px;color:var(--muted);margin-bottom:0}.topic-number{display:inline-block;color:#1787DB;font-size:12px;letter-spacing:.08em;margin-bottom:10px}.editorial-layout{display:grid;grid-template-columns:2fr 1fr;gap:18px}.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;min-width:0}.panel-emphasis{background:var(--pale)}.panel h3{margin-bottom:10px}.side-stack{display:grid;gap:18px}.side-stack .panel{padding:22px}.text-link{display:inline-block;font-weight:700;text-decoration:underline;margin-top:6px}.split-feature{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:38px}.split-feature.reverse .media{order:-1}.culture-feature{background:#fff;padding:26px;border:1px solid var(--line);border-radius:var(--radius)}.knowledge-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.knowledge-card{padding:21px 22px 16px;background:#fff;border-left:3px solid var(--cyan)}.knowledge-card .symbol{font-size:22px;color:#1A87AD;font-weight:800}.reading-steps{display:flex;gap:12px;align-items:stretch}.reading-steps>div{flex:1;min-width:0;background:#EAF6FA;border-radius:12px;padding:18px}.reading-steps span{color:#1087A0;font-weight:800;font-size:13px;display:block}.editor-note{padding:20px 24px;border-left:3px solid #1787DB;background:#EDF4F8;margin-bottom:52px}
.page-intro{padding-top:38px;padding-bottom:18px}.page-intro p{max-width:790px}.page-intro h1{margin-bottom:15px}.mini-index{display:flex;flex-wrap:wrap;gap:9px;margin:18px 0 24px}.mini-index a{background:var(--pale);border:1px solid var(--line);border-radius:8px;padding:7px 12px;text-decoration:none;font-size:14px}.mini-index a:hover{background:#D8F2F6}.content-section{margin-block:40px}.content-section h2{margin-bottom:17px}.content-section p{max-width:830px}.prose p{line-height:1.84}.prose ul,.prose ol{padding-left:24px}.prose li{margin-bottom:9px}.compare-table{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:12px;background:#fff}.compare-table table{width:100%;border-collapse:collapse;min-width:570px}.compare-table th,.compare-table td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top;font-size:15px}.compare-table th{background:#EAF6FA;color:var(--heading);font-weight:800}.compare-table tr:last-child td{border-bottom:0}.compare-table tbody th{background:#F6FAFC}.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.step{background:#fff;border-top:4px solid var(--sky);padding:22px;border-radius:0 0 12px 12px}.step b{display:block;color:#1787DB;font-size:14px;margin-bottom:8px}.step h3{font-size:19px}.feature-note{display:grid;grid-template-columns:1.4fr .8fr;gap:24px;align-items:center;background:#fff;border:1px solid var(--line);padding:24px;border-radius:14px}.feature-note p:last-child{margin-bottom:0}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-links a{background:#fff;border:1px solid var(--line);padding:17px 19px;border-radius:12px;font-weight:700;text-decoration:none;display:flex;justify-content:space-between;gap:12px}.related-links a:hover{border-color:var(--blue)}.football-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(210px,240px);justify-content:space-between;gap:35px}.term-aside{align-self:start;background:var(--pale);padding:22px;border-radius:14px}.term-aside h2{font-size:21px}.term-aside dt{font-weight:800;color:var(--heading)}.term-aside dd{margin:0 0 18px;font-size:14px}.project-matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.project-matrix>article{background:#fff;padding:22px;border-top:4px solid var(--cyan)}.project-matrix h3{margin-bottom:10px}.project-matrix p{font-size:15px}.gallery-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.gallery-grid figure{margin:0;background:#fff;border:1px solid var(--line);padding:14px;border-radius:14px;min-width:0}.gallery-grid figcaption{padding:14px 3px 0;font-size:14px}.gallery-grid figcaption strong{display:block;color:var(--heading);font-size:17px}.manual-block{padding:27px;background:#fff;border:1px solid var(--line);border-radius:16px;margin-block:30px}.manual-block h2{margin-top:0}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:0 20px;margin-bottom:10px}.faq-list summary{cursor:pointer;padding:14px 0;font-weight:750;color:var(--heading)}.faq-list details p{padding-bottom:14px;margin:0}.faq-list summary::marker{color:var(--blue)}.note{font-size:14px;color:#46647D;padding:14px 18px;background:#EAF6FA;border-left:3px solid var(--sky)}.service-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.service-nav a{background:#fff;border:1px solid var(--line);border-radius:10px;padding:15px;text-decoration:none}.service-nav strong{display:block}.service-nav span{font-size:14px;color:var(--muted)}
.site-footer{background:var(--footer);color:#EAF7FF;padding:43px 0 18px}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:50px}.footer-grid h2{font-size:17px;color:#fff}.footer-grid p{font-size:14px;color:#DAEAF4}.footer-grid a{color:#D7F7FB}.footer-grid nav{display:grid;grid-template-columns:1fr 1fr;gap:4px 16px;font-size:14px}.footer-brand{font-size:19px}.footer-brand small{display:block;font-size:11px;letter-spacing:.15em}.footer-bottom{border-top:1px solid #FFFFFF2A;margin-top:34px;padding-top:15px;font-size:12px;color:#BBD4E6}.bottom-nav{display:none}.back-top{position:fixed;right:22px;bottom:23px;width:42px;height:42px;border:0;border-radius:9px;background:var(--navy);color:white;opacity:0;visibility:hidden;transition:opacity .2s;z-index:20}.back-top.visible{opacity:1;visibility:visible}
@media(max-width:1180px){.wrap{width:calc(100% - 44px)}.channel-links{gap:18px}.hero{gap:25px}.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:980px){.topline{height:62px;justify-content:space-between}.menu-toggle{display:block;flex:none}.topline-tagline,.channel-bar{display:none}.brand{margin-inline:auto;max-width:calc(100% - 190px)}.brand .media,.brand .media img{max-height:30px}.brand .media{height:30px}.brand-fallback{font-size:16px}.entry-link{margin-left:0;font-size:13px;padding:6px 13px;min-height:39px}.drawer-overlay{display:block;position:fixed;inset:0;background:#0A263A88;z-index:80;visibility:hidden;opacity:0;pointer-events:none;transition:opacity .2s,visibility .2s}.drawer-overlay.is-open{visibility:visible;opacity:1;pointer-events:auto}.mobile-drawer{display:block;position:fixed;left:0;top:0;bottom:0;width:min(86vw,344px);overflow-y:auto;overscroll-behavior:contain;background:#fff;z-index:81;transform:translateX(-105%);visibility:hidden;transition:transform .2s,visibility .2s;padding:20px 21px}.mobile-drawer.is-open{visibility:visible;transform:none}.drawer-header{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:12px}.drawer-close{border:0;background:var(--pale);width:40px;height:40px;font-size:28px;border-radius:8px;line-height:1}.mobile-drawer nav p{font-weight:800;font-size:13px;color:#2185A4;margin:24px 0 5px}.mobile-drawer nav a{display:block;padding:9px 8px;text-decoration:none;border-radius:7px}.mobile-drawer nav a[aria-current=page]{background:var(--pale);font-weight:800}.hero h1{font-size:36px}.football-layout{grid-template-columns:1fr}.term-aside{max-width:unset}.quick-inner{gap:8px 20px}.project-matrix{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.hero,.split-feature,.feature-note{grid-template-columns:1fr}.hero{padding-block:34px 28px}.hero .media{grid-row:2}.split-feature.reverse .media{order:0}.editorial-layout,.gallery-grid,.footer-grid{grid-template-columns:1fr}.steps,.knowledge-grid,.related-links{grid-template-columns:1fr}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.reading-steps{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{gap:20px}.project-matrix{grid-template-columns:1fr}.culture-feature{padding:18px}}
@media(max-width:640px){body{font-size:15px;line-height:1.78}.wrap{width:calc(100% - 32px)}h1,.page-intro h1{font-size:27px}h2{font-size:22px}h3{font-size:18px}.hero h1{font-size:29px}.hero .lead{font-size:15px}.section-space{margin-block:34px}.page-intro{padding-top:26px}.panel{padding:18px}.side-stack .panel{padding:18px}.topic-card{padding:16px;min-height:0}.topic-card h3{font-size:16px}.topic-card p{font-size:13px}.topic-number{margin-bottom:5px}.media--hero{height:200px}.media--feature{height:180px}.media--card{height:145px}.media--banner{height:150px}.media--mobile{height:290px;max-width:250px}.media--inline{height:185px}.media--wide{max-height:155px;min-height:80px}.mini-index{gap:7px}.mini-index a{font-size:13px}.manual-block{padding:17px}.service-nav{grid-template-columns:1fr}.quick-inner{font-size:12px}.quick-inner a{margin-left:8px}.topline{gap:6px}.brand{max-width:calc(100% - 155px)}.entry-link{padding:6px 10px;min-height:38px}.bottom-nav{display:grid;position:fixed;bottom:0;left:0;right:0;grid-template-columns:repeat(4,1fr);z-index:25;background:#fff;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom,0px);box-shadow:0 -4px 12px #183A560D}.bottom-nav a{text-align:center;padding:9px 0 8px;color:var(--heading);text-decoration:none;font-size:13px}.bottom-nav a[aria-current=page]{color:#0A84B5;font-weight:800;border-top:2px solid var(--cyan)}body{padding-bottom:calc(48px + env(safe-area-inset-bottom,0px))}.back-top{bottom:calc(67px + env(safe-area-inset-bottom,0px));right:12px}.footer-grid nav{grid-template-columns:1fr 1fr}}
@media(max-height:540px) and (max-width:640px){.bottom-nav{position:static}body{padding-bottom:0}.back-top{bottom:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}

.nojs-navigation{display:flex;flex-wrap:wrap;gap:12px;padding-block:12px}.nojs-navigation a{padding:4px 8px;background:#EAF6FA;border-radius:6px}