/* 开云体育：无需外部依赖的阅读系统 */
:root{--paper:#f6f8f8;--white:#fff;--subtle:#eaf0f2;--navy:#122e3b;--deep:#1a4050;--teal:#168e96;--link:#226d9d;--heading:#193946;--body:#374d58;--muted:#647981;--line:#d9e3e6;--footer:#0c2632}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:104px}body{margin:0;background:var(--paper);color:var(--body);font:16.5px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif}a{color:var(--link);text-underline-offset:4px}a:hover{color:var(--teal)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #ffbf66;outline-offset:4px}p{margin:0 0 1.1em}h1,h2,h3{color:var(--heading);line-height:1.34;margin:0 0 .7em}h1{font-size:clamp(34px,3vw,42px);letter-spacing:-.03em}h2{font-size:clamp(24px,2.2vw,28px);margin-top:0}h3{font-size:20px}ul,ol{padding-left:1.4em}li{margin:.35em 0}strong{color:var(--heading)}figure{margin:0}.skip-link{position:absolute;top:-90px;left:15px;padding:9px 15px;background:white;z-index:999}.skip-link:focus{top:8px}.site-header{background:var(--navy);color:white;position:relative;z-index:10}.nav-wrap{max-width:1220px;margin:auto;display:flex;align-items:center;gap:18px;padding:0 28px;min-height:76px}.brand{text-decoration:none;color:white;display:flex;align-items:center;gap:8px;flex:0 0 auto;min-width:0}.brand:hover{color:white}.brand-word{font-size:10px;letter-spacing:.13em;white-space:nowrap;color:#d0e1e5}.brand-logo{display:block}.image-holder--logo{background:none;padding:0;border-radius:0;display:flex;align-items:center}.image-holder--logo img{max-height:38px;width:auto;height:auto;max-width:145px;object-fit:contain}.brand-logo .image-note{font-size:15px;color:white;margin:0}.desktop-nav{display:flex;align-items:center;gap:clamp(8px,1.05vw,17px);margin-left:auto;min-width:0}.desktop-nav a{font-size:13px;white-space:nowrap;text-decoration:none;color:#ebf5f6;padding:24px 0 21px;border-bottom:3px solid transparent}.desktop-nav a[aria-current=page]{font-weight:700;border-color:#46c3c7;color:white}.desktop-nav a:hover{color:#7fdee0}.register-link{display:inline-flex;align-items:center;justify-content:center;color:white;text-decoration:none;background:var(--teal);border:1px solid #4ca7ac;padding:7px 11px;border-radius:7px;font-weight:700;white-space:nowrap;font-size:13px}.register-link:hover{color:white;background:#0b737b}.mobile-nav{display:none}.breadcrumb-wrap{background:white;border-bottom:1px solid var(--line)}.breadcrumb{max-width:1220px;padding:9px 28px;margin:auto;font-size:13px;color:var(--muted)}.breadcrumb a{text-decoration:none}.breadcrumb span{margin-left:6px}.page-wrap{max-width:1220px;margin:auto;padding:37px 28px 76px;min-height:60vh}.eyebrow{display:block;color:var(--teal);font-size:12px;font-weight:700;letter-spacing:.16em;margin-bottom:13px}.lede{font-size:18px;line-height:1.78;max-width:800px}.intro{margin-bottom:42px}.muted{color:var(--muted)}.white-panel{background:white;border:1px solid var(--line);border-radius:12px;padding:26px}.section{margin-top:58px}.section-heading{max-width:820px}.section-heading p{max-width:740px}.rule{height:1px;background:var(--line);border:0;margin:43px 0}.split{display:grid;grid-template-columns:1.25fr 1fr;gap:34px;align-items:center;min-width:0}.split>*{min-width:0}.split--wide{grid-template-columns:1.7fr .85fr}.split--reverse{grid-template-columns:.85fr 1.7fr}.article{max-width:780px}.article p{max-width:76ch}.article h2{margin-top:42px}.article h3{margin-top:25px}.article li{max-width:80ch}.article-wide{max-width:1030px}.feature-note{border-left:4px solid var(--teal);background:var(--subtle);padding:18px 24px;border-radius:0 8px 8px 0}.feature-note p:last-child{margin-bottom:0}.quote{font-size:19px;color:var(--deep);border-left:3px solid var(--teal);padding-left:20px;margin:25px 0}.image-holder{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:8px;background:var(--subtle);border-radius:12px}.image-holder img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--image-limit,210px);object-fit:contain;object-position:center}.image-holder--hero{--image-limit:290px}.image-holder--feature{--image-limit:240px}.image-holder--inline{--image-limit:180px}.image-holder--rules{--image-limit:210px}.image-holder--banner{--image-limit:190px}.image-holder--portrait{--image-limit:330px;max-width:310px;margin-inline:auto}.image-note{padding:10px 14px;color:var(--muted);font-size:13px;margin:0;background:var(--subtle);border-left:2px solid var(--line)}.hero{display:grid;grid-template-columns:1.38fr 1fr;gap:32px;align-items:center;padding:34px 0 14px}.hero>*{min-width:0}.hero .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.button-link{display:inline-flex;align-items:center;padding:9px 17px;border:1px solid var(--teal);color:var(--deep);text-decoration:none;font-weight:700;border-radius:6px}.button-link.primary{background:var(--teal);color:white}.button-link:hover{background:var(--subtle)}.button-link.primary:hover{background:#087078;color:white}.route-list{display:grid;grid-template-columns:1fr;gap:0;border-top:1px solid var(--line)}.route-pair{display:grid;grid-template-columns:1fr 1fr;gap:28px;padding:20px 0;border-bottom:1px solid var(--line)}.route-item{display:grid;grid-template-columns:44px 1fr;gap:12px}.route-number{color:var(--teal);font-weight:700;font-size:20px}.route-item strong{display:block;font-size:18px}.route-item p{font-size:15px;margin:.25em 0}.compact-articles{background:var(--subtle);padding:22px;border-radius:10px}.compact-articles article+article{border-top:1px solid #cfdee2;padding-top:16px;margin-top:16px}.compact-articles h3{margin-bottom:8px}.three-notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.three-notes>div{border-top:3px solid var(--teal);padding-top:14px}.reading-steps{counter-reset:steps;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}.reading-steps>div{border-top:1px solid var(--line);padding-top:13px}.reading-steps span{display:block;color:var(--teal);font-size:26px;font-weight:700}.section-index{background:var(--subtle);border:1px solid var(--line);border-radius:8px;padding:15px 19px;margin:19px 0 28px}.section-index strong{display:block;margin-bottom:5px}.section-index div{display:flex;gap:12px 22px;flex-wrap:wrap;font-size:14px}.section-index a{text-decoration:underline}.reading-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:35px;align-items:start}.reading-layout>*,.reading-layout .article{min-width:0}.sticky-toc{position:sticky;top:20px;border-left:2px solid var(--teal);padding-left:17px}.sticky-toc a{display:block;margin:11px 0;font-size:15px}.wide-table{max-width:1040px;margin:22px 0 32px}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:8px;background:white}.table-scroll table{border-collapse:collapse;width:100%;min-width:560px;text-align:left;font-size:15px}.table-scroll caption{caption-side:top;text-align:left;font-weight:700;background:var(--subtle);color:var(--heading);padding:12px 15px}.table-scroll th,.table-scroll td{padding:13px 16px;border-bottom:1px solid var(--line);vertical-align:top}.table-scroll th{background:#eaf0f2;color:var(--heading)}.table-scroll tr:last-child td{border-bottom:0}.phase-list{list-style:none;padding:0;counter-reset:phase;border-left:2px solid var(--line);margin:20px 0 34px 10px}.phase-list li{position:relative;padding:0 0 22px 26px;counter-increment:phase;margin:0}.phase-list li:before{content:counter(phase);position:absolute;left:-15px;top:0;background:var(--teal);color:white;width:28px;height:28px;display:grid;place-items:center;border-radius:50%;font-size:12px;font-weight:bold}.phase-list li strong{display:block}.concept-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.concept-grid article{padding:23px;border-radius:9px;background:white;border:1px solid var(--line)}.concept-grid article:nth-child(2){background:var(--subtle)}.band{padding:24px 30px;background:var(--subtle);margin:20px 0;border-left:4px solid var(--teal)}.band.dark{background:var(--deep);color:#e4f1f3;border-color:#78dade}.band.dark h2,.band.dark h3,.band.dark strong{color:white}.exhibit{display:grid;grid-template-columns:1fr 1.25fr;gap:32px;align-items:center;margin:32px 0}.exhibit.reverse{grid-template-columns:1.25fr 1fr}.exhibit>*{min-width:0}.faq details{background:white;border:1px solid var(--line);border-radius:8px;padding:14px 18px;margin:9px 0}.faq summary{cursor:pointer;font-weight:700;color:var(--heading)}.faq details p{margin:10px 0 0}.related{border-top:2px solid var(--navy);margin-top:64px;padding-top:24px}.related-links{display:flex;gap:12px;flex-wrap:wrap}.related a{padding:8px 14px;background:white;border:1px solid var(--line);border-radius:6px;text-decoration:none}.guide-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}.guide-grid>*{min-width:0}.guide-links{list-style:none;padding:0}.guide-links li{padding:10px 0;border-bottom:1px solid var(--line)}.guide-links li a{font-weight:700}.guide-links small{display:block;color:var(--muted)}.site-footer{background:var(--footer);color:#d0e1e7}.footer-inner{max-width:1220px;margin:auto;padding:44px 28px 22px}.footer-primary{display:grid;grid-template-columns:1fr 1.5fr;gap:35px}.footer-primary p{max-width:420px;font-size:14px}.footer-brand{color:white;font-size:21px!important;font-weight:700}.footer-brand small{font-size:10px;color:#9bc6cc;display:block;letter-spacing:.13em}.footer-primary nav{display:flex;flex-wrap:wrap;gap:8px 18px;align-content:start}.site-footer a{color:#d5e9ef;font-size:14px}.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;border-top:1px solid #385460;margin-top:27px;padding-top:18px;color:#afc8cf;font-size:12px}
@media(max-width:1180px){.nav-wrap{gap:10px}.desktop-nav{gap:9px}.desktop-nav a{font-size:12px}.brand-word{font-size:9px}.brand-logo .image-holder--logo img{max-width:105px}.register-link{padding:6px 8px;font-size:12px}}
@media(max-width:980px){.nav-wrap{height:64px;min-height:64px;padding:0 22px;justify-content:space-between}.desktop-nav{display:none}.brand{position:absolute;left:50%;transform:translateX(-50%);max-width:48%}.brand-word{font-size:9px}.image-holder--logo img{max-height:30px;max-width:110px}.mobile-nav{display:block;position:relative;z-index:12}.mobile-nav summary{cursor:pointer;min-width:42px;min-height:42px;display:flex;align-items:center;gap:7px;color:white;list-style:none}.mobile-nav summary::-webkit-details-marker{display:none}.hamburger{font-size:23px;line-height:1}.menu-label{font-size:12px}.mobile-nav nav{position:absolute;top:52px;left:-22px;width:100vw;max-height:calc(100vh - 64px);overflow:auto;background:#153b4b;border-top:1px solid #43616d;padding:19px 22px 21px;box-shadow:0 14px 20px #0b202744}.mobile-nav-group{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px 15px;border-bottom:1px solid #365867;padding-bottom:15px;margin-bottom:15px}.mobile-nav-group strong{grid-column:1/-1;color:#86d3d5;font-size:13px}.mobile-nav-group a{color:white;font-size:14px}.mobile-nav-group a[aria-current=page]{font-weight:700;text-decoration-thickness:3px}.menu-close{background:transparent;color:white;border:1px solid #718e98;padding:7px 14px;border-radius:6px;cursor:pointer}.page-wrap{padding:30px 22px 60px}.breadcrumb{padding:8px 22px}.footer-inner{padding-left:22px;padding-right:22px}}
@media(max-width:760px){.hero,.split,.split--wide,.split--reverse,.reading-layout,.guide-grid,.exhibit,.exhibit.reverse,.footer-primary{grid-template-columns:1fr}.reading-layout{gap:10px}.sticky-toc{position:static;display:block}.hero{gap:20px}.split{gap:18px}.three-notes{grid-template-columns:1fr 1fr}.reading-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.exhibit.reverse .image-holder{order:0}.concept-grid{grid-template-columns:1fr}.section{margin-top:46px}.article h2{margin-top:31px}}
@media(max-width:640px){body{font-size:15.5px;line-height:1.78}h1{font-size:28px}h2{font-size:22px}h3{font-size:19px}.page-wrap{padding:24px 16px 49px}.breadcrumb{padding:8px 16px}.nav-wrap{padding:0 16px}.mobile-nav nav{left:-16px;padding:15px 16px}.brand-word{display:none}.brand{max-width:36%}.register-link{font-size:12px}.lede{font-size:16px}.hero{padding-top:15px}.hero-actions{gap:9px}.button-link{font-size:14px}.route-pair,.three-notes{grid-template-columns:1fr;gap:16px}.route-pair{padding:15px 0}.white-panel{padding:18px}.feature-note,.band{padding:16px}.image-holder--hero{--image-limit:195px}.image-holder--feature{--image-limit:180px}.image-holder--inline{--image-limit:140px}.image-holder--rules{--image-limit:165px}.image-holder--banner{--image-limit:125px}.image-holder--portrait{--image-limit:275px;max-width:240px}.image-holder--logo img{max-height:30px}.footer-inner{padding:29px 16px 18px}.footer-primary{gap:16px}.mobile-nav-group{grid-template-columns:1fr 1fr}}
@media(max-width:380px){.mobile-nav-group{grid-template-columns:1fr}.brand-logo .image-holder--logo img{max-width:105px}.menu-label{display:none}.reading-steps{grid-template-columns:1fr 1fr;gap:14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}