:root{--ink:#14213d;--ink2:#46526b;--tape:#f5c400;--paper:#fff;--wash:#eef1f6;--line:#d5dbe6;--ok:#0b6b4d}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;color:var(--ink);background:var(--paper)}
a{color:inherit}
:focus-visible{outline:3px solid var(--tape);outline-offset:2px}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header.top{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:5}
header.top .wrap{display:flex;align-items:center;gap:24px;height:58px}
.logo{font-weight:800;font-size:18px;text-decoration:none;letter-spacing:.2px;display:flex;align-items:center;gap:8px}
.logo i{display:inline-block;width:22px;height:10px;background:var(--tape);border:2px solid var(--ink);border-radius:2px;background-image:repeating-linear-gradient(90deg,var(--ink) 0 2px,transparent 2px 5px)}
nav{display:flex;gap:18px;margin-left:auto;font-size:15px;overflow-x:auto;white-space:nowrap}
nav a{text-decoration:none;color:var(--ink2);padding:4px 0}
nav a:hover{color:var(--ink);box-shadow:0 2px 0 var(--tape)}
.hero{background:var(--ink);color:#fff;padding:48px 0 0;position:relative}
.hero h1{font-size:clamp(30px,5vw,46px);line-height:1.2;margin:0 0 10px;font-weight:800}
.hero p.sub{margin:0 0 28px;color:#c9d3e6;max-width:620px}
.ruler{height:22px;margin-top:40px;background:var(--tape);background-image:repeating-linear-gradient(90deg,var(--ink) 0 2px,transparent 2px 10px),repeating-linear-gradient(90deg,var(--ink) 0 2px,transparent 2px 50px);background-size:100% 9px,100% 18px;background-repeat:repeat-x;background-position:0 0,0 0}
.tool{background:#fff;color:var(--ink);border-radius:10px;padding:22px;max-width:1080px;box-shadow:0 0 0 3px var(--tape)}
fieldset{border:0;margin:0 0 16px;padding:0}
legend{font-weight:700;margin-bottom:8px;padding:0}
.opts{display:flex;flex-wrap:wrap;gap:8px}
.opts input{position:absolute;opacity:0;pointer-events:none}
.opts label{border:1.5px solid var(--line);border-radius:6px;padding:7px 16px;cursor:pointer;background:#fff;font-size:15px;user-select:none}
.opts input:checked+label{background:var(--ink);color:#fff;border-color:var(--ink)}
.opts input:focus-visible+label{outline:3px solid var(--tape);outline-offset:2px}
.row{display:flex;gap:10px;flex-wrap:wrap}
.row input[type=text]{flex:1 1 180px;font:inherit;font-size:20px;font-weight:700;padding:9px 14px;border:1.5px solid var(--ink);border-radius:6px;min-width:0}
.btn{font:inherit;font-weight:800;background:var(--tape);color:var(--ink);border:2px solid var(--ink);border-radius:6px;padding:9px 28px;cursor:pointer}
.btn:hover{background:#ffd633}
#msg{min-height:1.5em;margin:10px 0 0;color:#b3261e;font-size:14px}
#result{margin-top:6px}
.res-title{font-weight:700;margin:4px 0 10px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px}
.cell{background:var(--wash);border-radius:8px;padding:10px 14px;border-left:5px solid var(--tape)}
.cell small{display:block;color:var(--ink2);font-size:13px}
.cell b{font-size:22px}
.note{font-size:13px;color:var(--ink2);margin:12px 0 0}
section{padding:48px 0}
section.alt{background:var(--wash)}
h2{font-size:26px;margin:0 0 6px;line-height:1.3}
.lead{color:var(--ink2);margin:0 0 22px;max-width:680px}
h3{font-size:17px;margin:0 0 10px}
.cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:28px}
.links{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:6px 12px}
.links a{display:block;padding:6px 10px;border-radius:6px;text-decoration:none;background:#fff;border:1px solid var(--line);font-size:14px}
.links a:hover{border-color:var(--ink);background:#fffbe0}
.tw{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:8px}
table{border-collapse:collapse;width:100%;min-width:420px;font-size:14px}
th,td{padding:8px 10px;text-align:center;border-bottom:1px solid var(--line)}
th{background:var(--ink);color:#fff;font-weight:600}
tr:last-child td{border-bottom:0}
td:first-child{font-weight:700}
.more{margin-top:14px}
.more a{font-weight:700}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.cards a{display:block;background:#fff;border:1px solid var(--line);border-radius:8px;padding:16px;text-decoration:none}
.cards a:hover{border-color:var(--ink)}
.cards b{display:block;margin-bottom:4px}
.cards span{font-size:14px;color:var(--ink2)}
details{background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin-bottom:10px}
summary{font-weight:700;cursor:pointer}
details p{margin:8px 0 0;color:var(--ink2)}
footer{background:var(--ink);color:#c9d3e6;padding:34px 0;font-size:14px}
footer a{color:#fff}
footer .fl{display:flex;flex-wrap:wrap;gap:6px 20px;margin-bottom:14px}
@media (max-width:560px){.hero{padding-top:32px}.tool{padding:16px}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.page{padding:40px 0 64px}
.narrow{max-width:760px}
.page h1{font-size:clamp(28px,4vw,38px);line-height:1.25;margin:0 0 8px}
.page h2{font-size:21px;line-height:1.4;margin:34px 0 8px}
.page p,.page li{color:#2b3550}
.page ul{padding-left:1.3em;margin:8px 0}
.page li{margin:4px 0}
.page a{text-decoration:underline;text-underline-offset:2px}
.page .updated{color:var(--ink2,#46526b);font-size:14px;margin:0 0 24px}
.page .box{background:var(--wash,#eef1f6);border-left:5px solid var(--tape,#f5c400);border-radius:8px;padding:14px 18px;margin:20px 0}
.page .box p{margin:0}