*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;color:#14213d;background:#f5f7fb;overflow-x:hidden}
img,svg,iframe{max-width:100%}
a{color:#1d4ed8}
header.site{background:#00030a;color:#fff;border-bottom:1px solid #0b3a66}
header.site .in{max-width:760px;margin:0 auto;padding:14px 16px;display:flex;flex-wrap:wrap;gap:8px 20px;align-items:center;justify-content:space-between}
header.site a{color:#fff;text-decoration:none}
header.site .brand{display:inline-block;line-height:0}
header.site .brand img{height:40px;width:auto;max-width:100%;display:block}
.hero{background:#fff;border:1px solid #dbe2ef;border-radius:12px;padding:12px;text-align:center}
.hero img{display:block;margin:0 auto;width:220px;max-width:55vw;height:auto}
header.site nav{display:flex;flex-wrap:wrap;gap:6px 16px}
main{max-width:760px;margin:0 auto;padding:20px 16px 48px}
h1{font-size:1.7rem;line-height:1.2;margin:.2em 0 .4em}
h2{font-size:1.25rem;margin:1.4em 0 .4em}
p,li{overflow-wrap:anywhere}
.card{background:#fff;border:1px solid #dbe2ef;border-radius:12px;padding:16px;margin:12px 0}
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
.plan h3{margin:0 0 4px}
.price{font-size:1.6rem;font-weight:700}
.muted{color:#52607a;font-size:.92rem}
.badge{display:inline-block;padding:2px 10px;border-radius:99px;font-size:.85rem;background:#e6edff;color:#1e3a8a}
.badge.ok{background:#dcfce7;color:#14532d}.badge.warn{background:#fef3c7;color:#78350f}.badge.bad{background:#fee2e2;color:#7f1d1d}
label{display:block;margin:12px 0 4px;font-weight:600}
input[type=email],input[type=password],input[type=text]{width:100%;max-width:100%;padding:12px;border:1px solid #9aa8c3;border-radius:8px;font:inherit}
button,.btn{display:inline-block;padding:12px 18px;border:0;border-radius:8px;background:#1d4ed8;color:#fff;font:inherit;font-weight:600;cursor:pointer;text-decoration:none;max-width:100%}
button.secondary,.btn.secondary{background:#e6edff;color:#1e3a8a}
button.danger{background:#b91c1c}
button[disabled]{opacity:.55;cursor:not-allowed}
.row{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.msg{padding:10px 12px;border-radius:8px;margin:12px 0}
.msg.err{background:#fee2e2;color:#7f1d1d}.msg.ok{background:#dcfce7;color:#14532d}.msg.info{background:#e6edff;color:#1e3a8a}
.draft{background:#fff7d6;border:1px solid #e0c04a;color:#5c4500;padding:10px 12px;border-radius:8px;margin:12px 0}
dl.kv{display:grid;grid-template-columns:minmax(0,max-content) minmax(0,1fr);gap:4px 14px;margin:8px 0}
dl.kv dt{font-weight:600}dl.kv dd{margin:0;overflow-wrap:anywhere}
code{background:#eef2fb;padding:1px 6px;border-radius:5px;overflow-wrap:anywhere;word-break:break-all}
details{margin-top:12px}summary{cursor:pointer;font-weight:600}
.pp{margin-top:10px;min-height:48px;max-width:100%}
label.check{display:flex;gap:10px;align-items:flex-start;font-weight:600}label.check input{margin-top:5px;width:20px;height:20px;flex:none}
footer{max-width:760px;margin:0 auto;padding:0 16px 32px;color:#52607a;font-size:.9rem}
footer a{margin-right:14px;display:inline-block}
footer .bizaddr{margin-top:8px;font-size:.85rem}
.hidden{display:none!important}
@media (max-width:420px){h1{font-size:1.45rem}dl.kv{grid-template-columns:1fr}dl.kv dt{margin-top:6px}}
table.kv-table{width:100%;border-collapse:collapse;font-size:.92rem;margin-top:10px}table.kv-table th,table.kv-table td{text-align:left;padding:6px 8px;border-bottom:1px solid #d7deec;overflow-wrap:anywhere}
header.site .lang{background:transparent;border:1px solid #3b6ea5;color:#fff;border-radius:6px;padding:2px 10px;font-weight:400;line-height:1.5;cursor:pointer}
header.site .lang .z,header.site .lang .e{opacity:.75}
html[data-lang="zh"] header.site .lang .z,html:not([data-lang="zh"]) header.site .lang .e{opacity:1;font-weight:700}
html:not([data-lang="zh"]) .l-zh{display:none}
html[data-lang="zh"] .l-en{display:none}
.dl-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin:12px 0}
.dl-card{display:flex;flex-direction:column;align-items:center;gap:6px;padding:14px 10px;background:#fff;border:1px solid #dbe2ef;border-radius:12px;text-decoration:none;color:#14213d;text-align:center;min-width:0}
.dl-card:hover{border-color:#1d4ed8;box-shadow:0 0 0 2px #e6edff}
.dl-card img{width:48px;height:48px;display:block}
.dl-card .name{font-weight:700;font-size:.95rem}
.dl-card .sub{color:#52607a;font-size:.78rem;line-height:1.3}
.guide details,.faq details{background:#fff;border:1px solid #dbe2ef;border-radius:10px;padding:10px 14px;margin:8px 0}
.guide details>summary,.faq details>summary{list-style:none}
.guide details>summary::-webkit-details-marker,.faq details>summary::-webkit-details-marker{display:none}
.guide details>summary::before,.faq details>summary::before{content:"+ ";font-weight:700;color:#1d4ed8}
.guide details[open]>summary::before,.faq details[open]>summary::before{content:"– "}
.guide ol{margin:.4em 0 .2em;padding-left:1.2em}
.guide li{margin:.25em 0}
.copy-row{display:inline-flex;flex-wrap:wrap;align-items:center;gap:8px}
button.tiny,.btn.tiny{padding:4px 10px;font-size:.85rem;border-radius:6px}
@media (max-width:420px){.dl-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
p.or{text-align:center;color:#52607a;font-weight:600;margin:4px 0}
@media (max-width:820px){input[type=email],input[type=password],input[type=text]{font-size:16px;min-height:48px}button,.btn{min-height:48px}}

.net h3{margin:16px 0 4px}
ul.net-tree,ul.net-tree ul{list-style:none;margin:6px 0 0;padding:0}
ul.net-tree ul{margin-left:22px;padding-left:12px;border-left:2px solid #d7deec}
ul.net-tree li{margin:6px 0}
.net-row{display:flex;flex-wrap:nowrap;align-items:center;gap:6px 10px}
.net-lvl{font-size:.8rem;font-weight:600;color:#475569;min-width:3.6em}
.net-mail{overflow-wrap:anywhere;flex:1 1 0;min-width:0}
.net-row .badge{flex:none;white-space:nowrap}
@media (max-width:480px){ul.net-tree ul{margin-left:8px;padding-left:8px}.net-row{gap:4px 6px}.net-lvl{min-width:3em;font-size:.72rem}.net-mail{font-size:.9rem}.net-row .badge{padding:2px 8px;font-size:.78rem}}

/* Owner traffic dashboard (/traffic). One column; colours from the Okabe-Ito colour-blind-safe palette, and every status also has a symbol and a word. */
main.traffic{max-width:800px}
.tr-range{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.tr-range button{min-height:48px;min-width:96px}
.tr-range button[aria-pressed="true"]{background:#1d4ed8;color:#fff}
.tr-card{border-left:8px solid #8a94a8}
.tr-card.l0{border-left-color:#009E73}.tr-card.l1{border-left-color:#E69F00}.tr-card.l2{border-left-color:#D55E00}
.tr-head{display:flex;flex-wrap:wrap;gap:6px 12px;align-items:center;justify-content:space-between}
.tr-head h2{margin:0}
.tr-badge{display:inline-block;padding:4px 12px;border-radius:99px;font-weight:700;background:#e5e7eb;color:#1f2937}
.tr-badge.l0{background:#c9f0e3;color:#064e3b}.tr-badge.l1{background:#fdecc0;color:#6b4300}.tr-badge.l2{background:#f9d3bd;color:#7a2d00}
.tr-banner{padding:10px 12px;border-radius:8px;margin:10px 0;font-weight:600;background:#e6edff;color:#1e3a8a}
.tr-banner.fire{background:#f9d3bd;color:#7a2d00;border:2px solid #D55E00}
.tr-chart{width:100%;height:auto;display:block;touch-action:pan-y}
.tr-chart text{font:11px system-ui,sans-serif;fill:#475569}
.tr-ro{min-height:2.8em;font-size:.9rem;color:#14213d;overflow-wrap:anywhere}
.tr-legend{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:.85rem;color:#334155;margin:4px 0}
.tr-legend span::before{content:"";display:inline-block;width:18px;height:0;border-top:3px solid currentColor;margin-right:6px;vertical-align:middle}
.tr-legend .bar::before{height:10px;border:0;background:currentColor;opacity:.55}
.tr-legend .dash::before{border-top-style:dashed}
.tr-legend .dot::before{border-top-style:dotted}
.tr-scroll{overflow-x:auto;max-width:100%}
.tr-table{width:100%;border-collapse:collapse;font-size:.85rem;table-layout:auto}
.tr-table th,.tr-table td{padding:5px 4px;border-bottom:1px solid #d7deec;text-align:right;overflow-wrap:anywhere}
.tr-table th:first-child,.tr-table td:first-child{text-align:left}
.tr-sub{margin:14px 0 4px;font-size:1.02rem}
ul.tr-notes{padding-left:1.2em}
@media (max-width:420px){.tr-range button{min-width:0;flex:1 1 40%}}
.tr-table .nw{white-space:nowrap}