:root{--bg:#F4F7FA;--paper:#fff;--muted:#EAF1F6;--light:#E9F8F8;--nav:#102E46;--dark:#163C57;--teal:#13B8C5;--blue:#237BD3;--heading:#18364B;--text:#344C60;--sub:#64798A;--line:#DCE6ED}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--text);overflow-wrap:break-word}img{max-width:100%}a{color:#1264a8;text-decoration:none}a:hover{text-decoration:underline}button{font:inherit;cursor:pointer}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:3px}h1,h2,h3{color:var(--heading);line-height:1.36;margin:0 0 19px}h1{font-size:36px}h2{font-size:27px}h3{font-size:20px}p{margin:0 0 18px}ul,ol{padding-left:25px;margin:12px 0 22px}li+li{margin-top:8px}.container{width:min(1200px,calc(100% - 56px));margin-inline:auto}.reading{max-width:790px}.section{padding:56px 0}.section-compact{padding:34px 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small{display:block;color:#16789b;font-size:13px;margin-top:5px}.feature-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:26px}.feature-main{padding:32px;background:white;border-top:4px solid var(--teal)}.feature-side{display:grid;gap:16px}.feature-side article{padding:25px;background:var(--muted)}.split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:center;gap:36px}.split.wide-text{grid-template-columns:minmax(0,42fr) minmax(0,58fr)}.blue-band{background:var(--dark);color:#e7f5fa}.blue-band h2,.blue-band h3{color:#fff}.soft-band{background:#eaf1f6}.accent-band{background:#e9f8f8}.three-notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.note{padding:24px;border-top:3px solid var(--teal);background:#fff}.three-notes .note:nth-child(2){margin-top:20px}.three-notes 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var(--line);border-radius:8px;padding:8px 14px}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:10px;background:#fff}.table-scroll table{border-collapse:collapse;width:100%;min-width:580px;line-height:1.65}table caption{text-align:left;font-weight:bold;color:var(--heading);padding:15px}th,td{border-bottom:1px solid var(--line);padding:13px 16px;text-align:left;vertical-align:top}th{color:var(--heading);background:#eaf1f6}tr:last-child td{border-bottom:0}.callout{background:var(--light);border-left:4px solid var(--teal);padding:20px 24px;margin:24px 0}.tactics{counter-reset:phase;list-style:none;margin:0;padding:0}.tactics li{counter-increment:phase;position:relative;padding:0 0 28px 58px;border-left:2px solid #a6dadd;margin-left:18px}.tactics li:before{content:counter(phase);position:absolute;left:-19px;top:0;background:var(--dark);color:#fff;width:36px;height:36px;display:grid;place-items:center;border-radius:50%}.tactics 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@media(max-width:1200px){.container{width:calc(100% - 44px)}.hero h1{font-size:38px}.main-nav a{font-size:14px}}
@media(max-width:920px){.brand-inner{height:63px;justify-content:space-between;gap:8px}.brand{max-width:min(47vw,210px);margin-inline:auto}.brand img{max-height:30px}.brand-text{font-size:20px}.brand-note,.main-nav{display:none}.register-link{margin:0;padding:7px 12px;min-height:40px;display:flex;align-items:center;justify-content:center}.menu-toggle{display:flex;width:40px;height:40px;border:0;background:transparent;flex-direction:column;justify-content:center;gap:5px;padding:8px;flex:none}.menu-toggle span{height:2px;background:var(--nav);width:100%;display:block}.mobile-overlay{display:block;position:fixed;inset:0;z-index:100;background:rgba(5,22,34,.56);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.mobile-drawer{display:block;position:fixed;z-index:101;left:0;top:0;bottom:0;width:min(86vw,340px);background:#fff;transform:translateX(-105%);visibility:hidden;transition:transform .25s,visibility .25s;padding:22px;overflow:auto;box-shadow:10px 0 30px rgba(0,0,0,.12)}.menu-open .mobile-overlay{opacity:1;visibility:visible;pointer-events:auto}.menu-open .mobile-drawer{visibility:visible;transform:translateX(0)}body.menu-open{overflow:hidden}.drawer-head{display:flex;justify-content:space-between;align-items:center;font-size:19px;font-weight:700;color:var(--heading)}.drawer-close{border:0;background:var(--muted);width:40px;height:40px;font-size:28px;line-height:1;border-radius:7px}.drawer-label{font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:var(--sub);margin:24px 0 4px}.mobile-drawer>a{display:block;padding:11px 7px;border-bottom:1px solid var(--line);color:var(--heading)}.mobile-quick{display:flex;flex-wrap:wrap;justify-content:space-around;gap:10px;padding-top:20px;padding-bottom:20px;font-size:14px}.nojs-nav{display:flex;flex-wrap:wrap;gap:12px;padding:12px 0}.nojs-nav a{font-size:13px}.hero-grid{gap:22px}}
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@media(max-width:640px){.container{width:calc(100% - 32px)}body{font-size:15px;line-height:1.78}.section{padding:36px 0}.section-compact{padding:24px 0}.hero{padding:34px 0 22px}.hero h1{font-size:30px}.page-intro{padding:28px 0 10px}.page-intro h1{font-size:27px}.hero p,.page-intro p{font-size:15.5px}h2{font-size:22px}h3{font-size:18px}.hero-grid,.topic-directory,.three-notes,.steps,.matrix,.related-grid{grid-template-columns:minmax(0,1fr)}.hero-grid{gap:21px}.three-notes .note:nth-child(n){margin-top:0}.steps{gap:10px}.feature-main,.feature-side article{padding:20px}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--long{--media-limit:175px}.media-frame--banner{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px}.brand{max-width:43vw}.register-link{font-size:12px;padding:7px 8px}.footer-bottom{display:block}.footer-links{gap:4px}.actions .button{padding:9px 12px}.article-section{padding:24px 0}.topic-link{padding:13px 0}.exhibit{gap:18px;margin:18px 0 28px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}