@charset "UTF-8";
:root{--ink:#101b2b;--navy:#0b1625;--muted:#596578;--line:#dce2e6;--paper:#f6f8f8;--white:#fff;--lime:#c7f054;--blue:#1848a4;--wrap:1180px;scroll-behavior:smooth}
*{box-sizing:border-box}html{font-size:16px}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC","Noto Sans CJK SC",Arial,sans-serif;-webkit-font-smoothing:antialiased}button,input{font:inherit}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #4977d4;outline-offset:3px}img{max-width:100%;display:block}.wrap{width:min(var(--wrap),calc(100% - 48px));margin-inline:auto}.eyebrow{display:inline-flex;align-items:center;gap:9px;color:#42618c;font-weight:800;letter-spacing:.13em;font-size:.75rem;text-transform:uppercase}.eyebrow:before{content:"";width:20px;height:2px;background:currentColor}.site-header{position:relative;z-index:20;background:var(--navy);color:#fff}.header-inner{width:min(1360px,calc(100% - 48px));height:78px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:32px}.brand{display:flex;align-items:center;gap:12px;white-space:nowrap;font-size:1.22rem;font-weight:900;letter-spacing:.04em;line-height:1.08}.brand-mark{display:grid;place-items:center;width:42px;height:42px;background:var(--lime);color:var(--navy);font-size:1.45rem;font-weight:950;transform:skew(-8deg)}.brand small{display:block;font:700 .59rem/1.6 Arial,sans-serif;letter-spacing:.12em;color:#a6b5c7}.main-nav{display:flex;align-items:center;gap:clamp(12px,1.9vw,30px)}.main-nav a{font-size:.9rem;font-weight:700;color:#d8e0eb;padding:29px 0 27px;border-bottom:3px solid transparent;white-space:nowrap}.main-nav a:hover,.main-nav a[aria-current]{color:var(--lime);border-color:var(--lime)}.menu-toggle{display:none;background:none;border:0;padding:8px;color:#fff}.menu-toggle span{display:block;width:23px;height:2px;margin:5px 0;background:currentColor}
.hero{height:600px;min-height:560px;position:relative;overflow:hidden;background:#152d49;color:#fff}.hero-photo,.hero-shade{position:absolute;inset:0}.hero-photo{background:url('../images/running-track.png') center 56%/cover no-repeat}.hero-shade{background:linear-gradient(90deg,rgba(7,20,39,.95) 0%,rgba(7,20,39,.83) 34%,rgba(7,20,39,.25) 72%,rgba(7,20,39,.08) 100%),linear-gradient(0deg,rgba(7,20,39,.42),transparent 35%)}.hero-inner{position:relative;z-index:1;padding-top:112px}.hero .eyebrow{color:var(--lime)}.hero h1{font-size:clamp(3rem,6vw,5.7rem);line-height:1.16;letter-spacing:-.04em;margin:24px 0 22px;max-width:750px}.hero h1 em{font-style:normal;color:var(--lime);font-size:.78em}.hero p{max-width:620px;color:#e2eaf2;font-size:1.07rem;line-height:1.95;margin:0 0 30px}.hero-actions{display:flex;align-items:center;gap:14px}.button-primary,.button-ghost,.button-light{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:12px 23px;border-radius:3px;font-size:.91rem;font-weight:800}.button-primary{background:var(--lime);color:#101d2b}.button-primary:hover{background:#d9ff78}.button-ghost{border:1px solid #b5c4d6;color:#fff}.button-ghost:hover{background:rgba(255,255,255,.13)}.hero-foot{display:flex;gap:22px;margin-top:76px;color:#e2eaf2;font-size:.82rem;letter-spacing:.08em}.hero-foot span:not(:last-child):after{content:"/";margin-left:22px;color:var(--lime)}
.intro-strip{display:grid;grid-template-columns:repeat(3,1fr);padding:29px 0;border-bottom:1px solid var(--line)}.intro-strip>div{display:grid;grid-template-columns:40px auto;column-gap:14px;align-items:baseline;padding:10px 28px;border-right:1px solid var(--line)}.intro-strip>div:first-child{padding-left:0}.intro-strip>div:last-child{border:0}.intro-strip strong{font:bold .9rem Arial;color:#7a8ca6}.intro-strip span{font-size:1.09rem;font-weight:900}.intro-strip p{grid-column:2;color:var(--muted);font-size:.86rem;margin:5px 0 0}.content-section{padding-block:78px 4px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:28px;margin-bottom:28px}.section-heading h2{font-size:clamp(1.65rem,3vw,2.65rem);line-height:1.25;letter-spacing:-.035em;margin:12px 0 0}.section-heading>p{max-width:385px;color:var(--muted);font-size:.93rem;line-height:1.75;margin:0 0 4px}.section-more{white-space:nowrap;font-weight:800;font-size:.91rem;border-bottom:2px solid var(--ink);padding-bottom:7px}.section-more:hover,.text-link:hover{color:var(--blue)}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.story-card{display:flex;flex-direction:column;background:#fff;padding:30px;border:1px solid #e3e8ec;min-height:400px;box-shadow:0 8px 22px rgba(25,40,58,.035);transition:transform .2s,box-shadow .2s}.story-card:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(25,40,58,.09)}.card-meta{display:flex;justify-content:space-between;gap:12px;color:#647189;font-size:.77rem;font-weight:700}.card-meta span{color:var(--blue)}.story-card h3{font-size:1.42rem;line-height:1.45;margin:25px 0 15px;letter-spacing:-.025em}.story-card h3 a:hover,.list-story h3 a:hover,.news-grid h3 a:hover,.news-list h3 a:hover{color:var(--blue)}.story-card p{color:#536174;line-height:1.8;font-size:.91rem;margin:0 0 26px;display:-webkit-box;-webkit-line-clamp:8;-webkit-box-orient:vertical;overflow:hidden}.text-link{margin-top:auto;font-size:.88rem;font-weight:900;color:#1d4a9a}.discussion-board{background:#fff;border-top:3px solid var(--ink)}.discussion-board>a{display:flex;align-items:center;gap:28px;padding:24px 28px;border-bottom:1px solid var(--line);transition:background .2s}.discussion-board>a:hover{background:#f1f5f7}.board-index{font:bold 1.2rem Arial;color:#7892ab}.discussion-board a div{flex:1}.discussion-board small{display:block;color:#60738a;font-size:.75rem;margin-bottom:5px}.discussion-board strong{font-size:1.1rem}.discussion-board a>span:last-child{font-size:1.3rem}.category-band{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:#d4dde3;border:1px solid #d4dde3}.category-band>a{background:#fff;padding:25px 18px;min-height:156px;transition:background .2s}.category-band>a:hover{background:#e8f2fa}.category-band span,.category-band strong,.category-band small{display:block}.category-band span{font:bold .8rem Arial;color:#758da6;margin-bottom:20px}.category-band strong{font-size:1.03rem}.category-band small{color:#657389;line-height:1.5;margin-top:6px}.split-feature{display:grid;grid-template-columns:1.15fr 1fr;padding-top:78px;gap:18px}.split-feature>div{min-height:350px;padding:43px}.split-dark{background:var(--navy);color:#fff}.split-dark .eyebrow{color:var(--lime)}.split-light{background:#e5edee}.split-feature h2{font-size:clamp(1.6rem,2.8vw,2.5rem);line-height:1.3;margin:21px 0}.split-feature p{line-height:1.85;color:inherit;max-width:480px;opacity:.82;margin-bottom:28px}.split-light .text-link{display:inline-block}.story-list{border-top:3px solid var(--ink)}.list-story{display:grid;grid-template-columns:112px 1fr 36px;gap:25px;padding:28px 8px;border-bottom:1px solid var(--line);align-items:start}.list-story>time{font:bold .85rem Arial;color:#7c8999;padding-top:6px}.list-label{font-size:.75rem;font-weight:800;color:#1d4a9a}.list-story h3{font-size:1.24rem;margin:7px 0 8px;line-height:1.4}.list-story p{color:var(--muted);line-height:1.72;font-size:.9rem;margin:0}.round-link{font-size:1.2rem;padding-top:4px}.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.news-grid article{background:#fff;border-top:3px solid var(--lime);padding:27px;min-height:280px;display:flex;flex-direction:column}.news-grid time{font:bold .81rem Arial;color:#70849c}.news-grid h3{font-size:1.2rem;line-height:1.45;margin:16px 0}.news-grid p{font-size:.87rem;color:#5c6879;line-height:1.75;margin:0 0 24px;display:-webkit-box;-webkit-line-clamp:5;-webkit-box-orient:vertical;overflow:hidden}.faq-section{padding-bottom:85px}.faq-list{border-top:2px solid var(--ink)}.faq-list details{background:#fff;border-bottom:1px solid var(--line);padding:0 25px}.faq-list summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;gap:20px;align-items:center;font-weight:800;padding:20px 0;font-size:1.02rem}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary span{font-weight:400;font-size:1.35rem}.faq-list details[open] summary span{transform:rotate(45deg)}.faq-list details p{color:var(--muted);line-height:1.85;max-width:880px;margin:0 0 22px}
.section-hero{background:#10243c;color:#fff;padding:72px 0 68px;position:relative;overflow:hidden}.section-hero:after{content:"";position:absolute;width:340px;height:340px;right:-110px;top:-140px;border:70px solid rgba(199,240,84,.11);border-radius:50%}.section-hero-inner{display:flex;align-items:end;justify-content:space-between;gap:30px;position:relative;z-index:1}.section-hero .eyebrow{color:var(--lime)}.section-hero h1{font-size:clamp(2.3rem,5vw,4.3rem);letter-spacing:-.04em;line-height:1.18;margin:20px 0}.section-hero p{max-width:680px;color:#d6e2ee;font-size:1.05rem;line-height:1.8;margin:0}.section-number{font:bold 5.5rem/1 Arial;color:var(--lime);text-align:right;white-space:nowrap}.section-number small{display:block;color:#d1e0ea;font-size:.82rem;margin-top:9px}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.topic-tile{background:#fff;border:1px solid var(--line);padding:27px}.topic-tile span{font:bold .78rem Arial;color:#6186aa}.topic-tile h3{margin:23px 0 8px;font-size:1.16rem}.topic-tile p{margin:0;color:var(--muted);font-size:.9rem;line-height:1.7}.callout{background:#dfe9e8;padding:34px 42px;display:flex;align-items:center;justify-content:space-between;gap:24px}.callout h2{font-size:1.55rem;margin:12px 0}.callout p{color:var(--muted);margin:0;line-height:1.7;max-width:700px}.button-light{background:var(--navy);color:#fff;white-space:nowrap}.button-light:hover{background:#214166}.news-list{border-top:3px solid var(--ink)}.news-list article{display:grid;grid-template-columns:140px 1fr;gap:25px;padding:28px 4px;border-bottom:1px solid var(--line)}.news-list time{font:bold .89rem Arial;color:#66788e;padding-top:7px}.news-list h3{font-size:1.35rem;margin:0 0 10px}.news-list p{max-width:850px;color:var(--muted);line-height:1.78;margin:0 0 14px}
.article-shell{padding-top:28px;padding-bottom:92px}.breadcrumb{display:flex;align-items:center;gap:10px;color:#68798d;font-size:.83rem;margin-bottom:32px}.breadcrumb a:hover{text-decoration:underline}.article-layout{display:grid;grid-template-columns:minmax(0,780px) 1fr;gap:64px;align-items:start}.article-main{min-width:0}.article-kicker{display:flex;align-items:center;gap:20px}.article-kicker time{font-size:.83rem;color:#697b90}.article-main h1{font-size:clamp(2rem,4vw,3.65rem);line-height:1.24;letter-spacing:-.035em;margin:20px 0 22px}.article-deck{font-size:1.13rem;line-height:1.85;color:#516073;margin:0}.article-divider{height:3px;background:linear-gradient(90deg,var(--lime) 0 90px,#dce2e6 90px 100%);margin:32px 0 44px}.article-body section{margin-bottom:39px}.article-body h2{font-size:1.42rem;line-height:1.45;margin:0 0 18px}.article-body p{font-size:1.03rem;line-height:2.05;color:#314053;margin:0 0 19px}.editor-note{background:#e7efeb;border-left:4px solid #8db850;padding:24px 27px;margin:48px 0}.editor-note strong{font-size:1rem}.editor-note p{margin:8px 0 0}.related{border-top:2px solid var(--ink);padding-top:26px}.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.related-grid a{display:flex;flex-direction:column;gap:12px;background:#fff;padding:20px;border:1px solid var(--line);min-height:140px}.related-grid a:hover{border-color:#8aa4c3}.related-grid span{color:#71849b;font-size:.75rem}.related-grid strong{line-height:1.5}.related-grid em{font-style:normal;font-size:.8rem;color:#1d4a9a;font-weight:800;margin-top:auto}.article-aside{position:sticky;top:24px}.aside-panel{background:#10243c;color:#fff;padding:28px}.aside-panel .eyebrow{color:var(--lime)}.aside-panel h2{font-size:1.35rem;line-height:1.4;margin:20px 0}.aside-panel p{font-size:.91rem;color:#d4e1ed;line-height:1.82}.aside-panel a{display:inline-block;margin-top:8px;color:var(--lime);font-weight:800;font-size:.85rem}
.site-footer{background:var(--navy);color:#d7e0ec;margin-top:80px}.footer-top{display:flex;justify-content:space-between;gap:55px;padding:53px 0 46px}.footer-brand{font-size:1.5rem;color:#fff;font-weight:900}.footer-top p{font-size:.87rem;line-height:1.8;color:#a9b8c9;max-width:350px}.footer-top nav{display:grid;grid-template-columns:repeat(3,auto);gap:16px 34px;align-content:start}.footer-top nav a{font-size:.86rem}.footer-top nav a:hover{color:var(--lime)}.footer-bottom{display:flex;gap:27px;flex-wrap:wrap;border-top:1px solid #344357;padding:20px 0 27px;color:#9eafc1;font-size:.77rem}.back-top{position:fixed;z-index:15;bottom:22px;right:22px;width:42px;height:42px;background:var(--lime);color:var(--navy);border:0;cursor:pointer;font-size:1.2rem;font-weight:900;box-shadow:0 5px 20px #0003;display:none}.back-top.visible{display:block}
@media(max-width:1050px){.main-nav{gap:13px}.main-nav a{font-size:.81rem}.brand{font-size:1rem}.brand small{font-size:.49rem}.article-layout{gap:32px}.category-band{grid-template-columns:repeat(3,1fr)}}
@media(max-width:760px){.wrap,.header-inner{width:min(100% - 32px,var(--wrap))}.header-inner{height:66px}.menu-toggle{display:block}.main-nav{display:none;position:absolute;top:66px;left:0;right:0;background:var(--navy);padding:10px 16px 20px;box-shadow:0 10px 20px #0003}.main-nav.open{display:grid;grid-template-columns:repeat(2,1fr);gap:3px}.main-nav a{padding:14px 10px;border-bottom:1px solid #304051;font-size:.88rem}.hero{height:auto;min-height:620px}.hero-photo{background-position:62% center}.hero-shade{background:linear-gradient(90deg,rgba(7,20,39,.94),rgba(7,20,39,.55)),linear-gradient(0deg,rgba(7,20,39,.6),transparent)}.hero-inner{padding-top:92px;padding-bottom:35px}.hero h1{font-size:clamp(2.55rem,9vw,4rem)}.hero p{font-size:1rem}.hero-foot{flex-wrap:wrap;margin-top:70px;gap:9px 16px}.hero-foot span:not(:last-child):after{margin-left:16px}.intro-strip{grid-template-columns:1fr;padding:18px 0}.intro-strip>div,.intro-strip>div:first-child{padding:15px 0;border-right:0;border-bottom:1px solid var(--line)}.intro-strip>div:last-child{border-bottom:0}.content-section{padding-top:55px}.section-heading{align-items:start;flex-direction:column;gap:12px}.section-heading>p{max-width:none}.feature-grid,.topic-grid,.news-grid{grid-template-columns:1fr}.story-card{min-height:0}.story-card p{-webkit-line-clamp:6}.category-band{grid-template-columns:repeat(2,1fr)}.split-feature{grid-template-columns:1fr;padding-top:55px}.split-feature>div{min-height:0;padding:31px}.faq-section{padding-bottom:55px}.section-hero{padding:55px 0}.section-number{display:none}.list-story{grid-template-columns:1fr 25px;gap:10px}.list-story>time{grid-column:1/-1}.callout{align-items:start;flex-direction:column;padding:28px}.news-list article{grid-template-columns:1fr;gap:8px}.article-layout{grid-template-columns:1fr}.article-aside{position:static}.article-shell{padding-bottom:20px}.footer-top{flex-direction:column;gap:25px;padding:45px 0}.footer-top nav{grid-template-columns:repeat(2,1fr);gap:14px}.site-footer{margin-top:65px}}
@media(max-width:430px){.hero-actions{align-items:stretch;flex-direction:column;max-width:240px}.hero-foot{font-size:.72rem}.category-band{grid-template-columns:1fr 1fr}.category-band>a{min-height:150px;padding:20px 12px}.related-grid{grid-template-columns:1fr}.article-body p{font-size:1rem}.article-main h1{font-size:2rem}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}