:root{--ink:#132238;--muted:#5f7188;--line:#d7e4ef;--paper:#fff;--wash:#f3f8fb;--blue:#0868b8;--teal:#0b8a80;--orange:#f45a2a}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--wash);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.75}
a{color:inherit}
.system-site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.system-nav{max-width:1280px;margin:auto;min-height:84px;padding:12px 28px;display:flex;align-items:center;justify-content:space-between;gap:28px}
.system-brand{display:flex;align-items:center;gap:12px;text-decoration:none;min-width:310px}
.system-brand img{width:54px;height:54px;object-fit:contain;border:1px solid var(--line);border-radius:6px;padding:4px}
.system-brand strong{display:block;font-size:20px;line-height:1.25}.system-brand span{display:block;color:var(--muted);font-size:13px}
.system-links{display:flex;align-items:center;gap:22px;flex-wrap:wrap}.system-links a{text-decoration:none;font-weight:700;font-size:15px}.system-links a[aria-current="page"],.system-links a:hover{color:var(--orange)}
.system-hero{background:#163d61;color:#fff}.system-hero-inner{max-width:1280px;margin:auto;padding:72px 34px 68px;display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:48px;align-items:end}
.eyebrow{margin:0 0 12px;color:#79d7ce;font-weight:800;font-size:14px;text-transform:uppercase}.system-hero h1{margin:0;max-width:900px;font-size:clamp(38px,5vw,68px);line-height:1.12;letter-spacing:0}.system-hero .english{margin:14px 0 0;color:#cfe7f5;font-size:20px;font-weight:700}.system-hero .lead{margin:22px 0 0;max-width:850px;color:#e8f2f7;font-size:18px}.hero-note{border-left:4px solid var(--orange);padding:8px 0 8px 20px;color:#dcecf5}.hero-note strong{display:block;color:#fff;font-size:26px}.hero-note span{font-size:14px}
.system-main{max-width:1280px;margin:auto;padding:48px 28px 80px}.system-section{margin:0 0 42px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:18px}.section-heading h2{margin:0;font-size:clamp(28px,3vw,42px);line-height:1.2}.section-heading p{margin:0;color:var(--muted);max-width:560px}
.intro-panel{background:#fff;border:1px solid var(--line);border-left:5px solid var(--orange);padding:28px 30px}.intro-panel p{margin:0;font-size:18px;color:#344b65}
.principles,.system-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.principle,.system-card{background:#fff;border:1px solid var(--line);padding:24px;min-width:0}.principle b{display:block;color:var(--blue);font-size:18px;margin-bottom:6px}.principle p,.system-card p{margin:0;color:var(--muted)}
.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line)}table{width:100%;border-collapse:collapse;min-width:860px}th,td{text-align:left;vertical-align:top;padding:16px 18px;border-bottom:1px solid var(--line)}th{background:#e9f4f8;color:#124b73;font-size:14px}tr:last-child td{border-bottom:0}td:first-child{font-weight:800;color:#0d619b}
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;counter-reset:item}.step{background:#fff;border:1px solid var(--line);padding:24px}.step:before{counter-increment:item;content:counter(item,decimal-leading-zero);display:block;color:var(--orange);font-weight:900;font-size:25px;margin-bottom:10px}.step h3{margin:0 0 6px;font-size:19px}.step p{margin:0;color:var(--muted)}
.official{background:#153f64;color:#fff;padding:34px;border-left:6px solid var(--orange)}.official .eyebrow{color:#8be0d4}.official h2{margin:0 0 14px;font-size:32px}.official p{margin:0;color:#edf6fa;font-size:18px}
.system-switcher{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.system-switcher a{background:#fff;border:1px solid var(--line);padding:18px;text-decoration:none;font-weight:800}.system-switcher a:hover,.system-switcher a[aria-current="page"]{border-color:var(--orange);box-shadow:inset 0 4px var(--orange)}.system-switcher small{display:block;color:var(--muted);font-weight:600}
.system-card{display:flex;flex-direction:column;min-height:250px}.system-card .number{color:var(--orange);font-size:34px;font-weight:900}.system-card h2{font-size:23px;line-height:1.3;margin:14px 0 10px}.system-card .en{color:var(--blue);font-weight:800;font-size:14px;margin-bottom:12px}.system-card a{margin-top:auto;color:var(--blue);font-weight:800;text-decoration:none}
.system-footer{background:#123e63;color:#d8e7f1;padding:28px;text-align:center;font-size:14px}
@media(max-width:900px){.system-site-header{position:static}.system-nav{align-items:flex-start;flex-direction:column}.system-brand{min-width:0}.system-links{width:100%;gap:14px}.system-hero-inner{grid-template-columns:1fr;padding:54px 24px}.principles,.system-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.steps{grid-template-columns:1fr 1fr}.system-switcher{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.system-nav{padding:12px 18px}.system-brand strong{font-size:17px}.system-links{overflow-x:auto;flex-wrap:nowrap;padding-bottom:6px}.system-links a{white-space:nowrap}.system-main{padding:34px 16px 58px}.system-hero h1{font-size:40px}.principles,.system-grid,.steps,.system-switcher{grid-template-columns:1fr}.section-heading{align-items:flex-start;flex-direction:column}.intro-panel,.official{padding:23px}.system-card{min-height:0}th,td{padding:13px 14px}}