:root{
  --bg:#080b14; --bg2:#0d1220; --bg3:#131a2c; --line:#1e2740;
  --txt:#e8ecf5; --txt2:#9aa6c0; --txt3:#6b7794;
  --cf:#f6821f; --cf2:#fbad41; --cyan:#22d3ee; --green:#34d399;
  --red:#f87171; --amber:#fbbf24;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg); color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.7; -webkit-font-smoothing:antialiased;
}
.wrap{max-width:1240px;margin:0 auto;padding:0 24px}
a{color:var(--cf2);text-decoration:none}
a:hover{text-decoration:underline}
code{font-family:var(--mono);font-size:.92em;background:var(--bg3);padding:1px 5px;border-radius:4px;color:var(--cf2)}

/* ---------- nav ---------- */
nav{position:sticky;top:0;z-index:100;background:rgba(8,11,20,.93);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;gap:26px;height:58px;overflow-x:auto;scrollbar-width:none}
nav .wrap::-webkit-scrollbar{display:none}
nav a{color:var(--txt2);text-decoration:none;font-size:13.5px;white-space:nowrap;padding:4px 0;border-bottom:2px solid transparent;transition:.15s}
nav a:hover{color:var(--txt);border-bottom-color:var(--cf);text-decoration:none}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:14.5px;color:var(--txt);white-space:nowrap}
.brand svg{flex:none}
.navright{margin-left:auto;display:flex;gap:10px;align-items:center}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:7px;background:var(--bg3);border:1px solid var(--line);color:var(--txt);border-radius:9px;padding:9px 16px;font-size:13.5px;cursor:pointer;font-family:inherit;transition:.15s;font-weight:550;text-decoration:none}
.btn:hover{border-color:var(--cf);color:var(--cf2);text-decoration:none}
.btn-p{background:linear-gradient(92deg,var(--cf),var(--cf2));border:none;color:#0b0e16;font-weight:700}
.btn-p:hover{filter:brightness(1.08);color:#0b0e16}
.btn-sm{padding:6px 12px;font-size:12.5px}

/* ---------- hero ---------- */
header.hero{padding:66px 0 46px;border-bottom:1px solid var(--line);
  background:radial-gradient(900px 380px at 12% -10%,rgba(246,130,31,.16),transparent 60%),
             radial-gradient(760px 340px at 88% 0%,rgba(34,211,238,.12),transparent 60%)}
h1{font-size:36px;line-height:1.24;font-weight:800;letter-spacing:-.5px;margin-bottom:16px}
.accent{background:linear-gradient(92deg,var(--cf),var(--cf2) 45%,var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.lede{font-size:16.5px;color:var(--txt2);max-width:840px}
.lede strong{color:var(--txt);font-weight:600}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.pills{display:flex;flex-wrap:wrap;gap:9px;margin-top:24px}
.pill{background:var(--bg3);border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:12.5px;color:var(--txt2)}
.pill b{color:var(--cf);font-family:var(--mono);font-weight:600}

/* ---------- sections ---------- */
section{padding:58px 0;border-bottom:1px solid var(--line)}
h2{font-size:25px;font-weight:750;letter-spacing:-.3px;margin-bottom:10px;display:flex;align-items:center;gap:11px}
h2 .num{font-family:var(--mono);font-size:13px;color:var(--cf);background:rgba(246,130,31,.12);border:1px solid rgba(246,130,31,.28);border-radius:7px;padding:3px 9px;font-weight:600}
.sub{color:var(--txt2);font-size:14.5px;margin-bottom:28px;max-width:900px}
h3{font-size:17px;font-weight:680;margin:30px 0 12px}

/* ---------- cards ---------- */
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(auto-fit,minmax(330px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.card{background:var(--bg2);border:1px solid var(--line);border-radius:13px;padding:20px}
.card h4{font-size:14.5px;font-weight:680;margin-bottom:8px;display:flex;align-items:center;gap:8px}
.card p{font-size:13.5px;color:var(--txt2)}
.card .ico{width:28px;height:28px;border-radius:8px;background:rgba(246,130,31,.12);display:flex;align-items:center;justify-content:center;flex:none}

/* ---------- table ---------- */
table{width:100%;border-collapse:collapse;font-size:13.5px}
th{text-align:left;padding:11px 12px;color:var(--txt3);font-weight:600;font-size:11.5px;letter-spacing:.6px;text-transform:uppercase;border-bottom:1px solid var(--line);white-space:nowrap;background:var(--bg2);position:sticky;top:58px;z-index:5}
td{padding:10px 12px;border-bottom:1px solid rgba(30,39,64,.6);vertical-align:middle}
tbody tr:hover{background:rgba(246,130,31,.045)}
.tscroll{max-height:560px;overflow:auto;border:1px solid var(--line);border-radius:12px;background:var(--bg2)}
.tscroll::-webkit-scrollbar{width:9px;height:9px}
.tscroll::-webkit-scrollbar-thumb{background:#26304c;border-radius:5px}
.tscroll::-webkit-scrollbar-track{background:var(--bg2)}
.cidr{font-family:var(--mono);font-size:12.5px;color:var(--cyan)}
.edge{font-family:var(--mono);font-size:11.5px;color:var(--txt3)}
.flag{display:inline-flex;align-items:center;justify-content:center;width:26px;height:19px;border-radius:3px;background:var(--bg3);border:1px solid var(--line);font-family:var(--mono);font-size:10px;font-weight:700;color:var(--txt2);margin-right:9px;flex:none;vertical-align:middle}
.tag{display:inline-block;padding:2px 8px;border-radius:5px;font-size:11px;font-weight:600;white-space:nowrap}
.t-low{background:rgba(52,211,153,.13);color:var(--green);border:1px solid rgba(52,211,153,.25)}
.t-mid{background:rgba(251,191,36,.13);color:var(--amber);border:1px solid rgba(251,191,36,.25)}
.t-high{background:rgba(248,113,113,.13);color:var(--red);border:1px solid rgba(248,113,113,.28)}

/* ---------- controls ---------- */
.ctl{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:16px;align-items:center}
input[type=search],input[type=text],select{background:var(--bg2);border:1px solid var(--line);color:var(--txt);border-radius:9px;padding:9px 13px;font-size:13.5px;font-family:inherit;outline:none}
input[type=search]{min-width:250px}
input:focus,select:focus{border-color:var(--cf)}

/* ---------- map ---------- */
.mapbox{background:var(--bg2);border:1px solid var(--line);border-radius:14px;padding:10px;overflow:hidden}
.mapbox svg{display:block;width:100%;height:auto}
.node{transition:.18s}
.node circle.dot{fill:var(--cf);stroke:rgba(255,255,255,.35);stroke-width:.5}
.node circle.halo{fill:var(--cf);opacity:.16}
.node:hover circle.halo{opacity:.42}
.node text{font-family:var(--mono);font-size:8.5px;fill:var(--txt3);pointer-events:none}
.legend{display:flex;flex-wrap:wrap;gap:16px;margin-top:14px;font-size:12.5px;color:var(--txt2)}
.legend i{display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:6px;vertical-align:middle}
.mapstat{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-bottom:20px}
.mapstat div{background:var(--bg2);border:1px solid var(--line);border-radius:11px;padding:14px}
.mapstat b{display:block;font-size:23px;font-family:var(--mono);color:var(--cf2);font-weight:700;line-height:1.2}
.mapstat span{font-size:12px;color:var(--txt3)}
.tip{position:fixed;pointer-events:none;background:#050810;border:1px solid var(--cf);border-radius:8px;padding:7px 11px;font-size:12px;color:var(--txt);opacity:0;transition:opacity .12s;z-index:500;white-space:nowrap;box-shadow:0 6px 20px rgba(0,0,0,.5)}
.tip b{color:var(--cf2)}

/* ---------- steps ---------- */
.step{background:var(--bg2);border:1px solid var(--line);border-radius:13px;margin-bottom:13px;overflow:hidden;transition:.18s}
.step.open{border-color:rgba(246,130,31,.42)}
.step.done{background:rgba(52,211,153,.05);border-color:rgba(52,211,153,.3)}
.sh{display:flex;align-items:center;gap:14px;padding:16px 20px;cursor:pointer;user-select:none}
.sh:hover{background:rgba(255,255,255,.022)}
.sn{width:29px;height:29px;border-radius:50%;background:var(--bg3);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:12.5px;font-weight:700;color:var(--txt2);flex:none}
.step.done .sn{background:rgba(52,211,153,.16);border-color:rgba(52,211,153,.4);color:var(--green)}
.step.done .sn::after{content:"\2713"}
.step.done .sn span{display:none}
.st{font-size:15px;font-weight:640;flex:1}
.smeta{font-size:11.5px;color:var(--txt3);font-family:var(--mono);white-space:nowrap}
.sb{padding:0 20px 20px 63px;display:none;font-size:14px;color:var(--txt2)}
.step.open .sb{display:block}
.sb ol,.sb ul{margin:8px 0 8px 20px}
.sb li{margin-bottom:7px}
.sb strong{color:var(--txt)}
.chk{display:flex;align-items:flex-start;gap:10px;padding:7px 0;font-size:13.5px;cursor:pointer}
.chk input{accent-color:var(--cf);width:15px;height:15px;margin-top:4px;cursor:pointer;flex:none}

/* ---------- code ---------- */
.codebox{background:#050810;border:1px solid var(--line);border-radius:12px;margin:12px 0;overflow:hidden}
.ch{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:var(--bg2);border-bottom:1px solid var(--line);gap:12px}
.cl{font-family:var(--mono);font-size:12px;color:var(--txt2);display:flex;align-items:center;gap:8px;min-width:0}
.cl::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--cf);flex:none}
.cp{background:transparent;border:1px solid var(--line);color:var(--txt2);border-radius:7px;padding:5px 11px;font-size:11.5px;cursor:pointer;font-family:var(--mono);transition:.15s;flex:none}
.cp:hover{border-color:var(--cf);color:var(--cf2)}
pre{padding:15px 17px;overflow-x:auto;font-family:var(--mono);font-size:12.5px;line-height:1.65;color:#c8d3e8}
pre::-webkit-scrollbar{height:8px}
pre::-webkit-scrollbar-thumb{background:#26304c;border-radius:4px}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.tab{background:var(--bg2);border:1px solid var(--line);border-radius:9px;padding:8px 14px;font-size:13px;cursor:pointer;color:var(--txt2);font-family:inherit;transition:.15s}
.tab:hover{color:var(--txt)}
.tab.on{background:rgba(246,130,31,.13);border-color:var(--cf);color:var(--cf2);font-weight:600}

/* ---------- note ---------- */
.note{border-left:3px solid var(--cf);background:rgba(246,130,31,.06);padding:14px 17px;border-radius:0 10px 10px 0;margin:16px 0;font-size:13.5px;color:var(--txt2)}
.warn{border-left-color:var(--amber);background:rgba(251,191,36,.06)}
.danger{border-left-color:var(--red);background:rgba(248,113,113,.06)}
.note b{color:var(--txt)}

/* ---------- settings panel ---------- */
.setpanel{background:linear-gradient(180deg,var(--bg2),#0a0f1c);border:1px solid var(--line);border-radius:14px;padding:22px;margin-bottom:24px}
.setpanel h3{margin-top:0;display:flex;align-items:center;gap:9px}
.setgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:16px 0}
.field label{display:block;font-size:12px;color:var(--txt3);margin-bottom:5px}
.field input,.field select{width:100%;background:var(--bg3);border:1px solid var(--line);color:var(--txt);border-radius:9px;padding:10px 12px;font-size:13.5px;font-family:inherit}
.field input:focus,.field select:focus{border-color:var(--cf);outline:none}
.hint{font-size:11.5px;color:var(--txt3);margin-top:5px}
.setbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}
.setbar .prev{font-family:var(--mono);font-size:12.5px;color:var(--cyan);background:var(--bg3);padding:6px 11px;border-radius:7px;border:1px solid var(--line)}

/* ---------- progress ---------- */
.prog{display:flex;align-items:center;gap:13px;background:var(--bg2);border:1px solid var(--line);border-radius:11px;padding:13px 17px;margin-bottom:20px}
.pbar{flex:1;height:7px;background:var(--bg3);border-radius:4px;overflow:hidden}
.pfill{height:100%;background:linear-gradient(90deg,var(--cf),var(--cf2));border-radius:4px;width:0;transition:width .35s}
.ptxt{font-family:var(--mono);font-size:12.5px;color:var(--txt2);white-space:nowrap}

/* ---------- faq ---------- */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{padding:15px 4px;cursor:pointer;font-size:14.5px;font-weight:600;list-style:none;display:flex;align-items:center;gap:10px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";font-family:var(--mono);color:var(--cf);font-size:17px;font-weight:700;flex:none}
.faq details[open] summary::before{content:"\2212"}
.faq .fa{padding:0 4px 16px 26px;font-size:13.5px;color:var(--txt2)}

/* ---------- misc ---------- */
.kv{display:grid;grid-template-columns:auto 1fr;gap:7px 16px;font-size:13.5px}
.kv dt{color:var(--txt3)}
.kv dd{color:var(--txt2)}
footer{padding:38px 0;color:var(--txt3);font-size:12.5px}
footer .wrap{display:flex;flex-wrap:wrap;gap:18px;justify-content:space-between;align-items:flex-start}
.badge{display:inline-flex;align-items:center;gap:6px;background:rgba(52,211,153,.1);border:1px solid rgba(52,211,153,.25);color:var(--green);border-radius:999px;padding:4px 11px;font-size:11.5px;font-weight:600}
.badge i{width:6px;height:6px;border-radius:50%;background:var(--green)}
@media(max-width:640px){h1{font-size:26px}.sb{padding-left:20px}th{position:static}}

/* ===== VPN 项目扩充 ===== */
.tier{display:inline-block;padding:2px 9px;border-radius:20px;font-size:11.5px;font-weight:700;letter-spacing:.3px}
.tier-A{background:rgba(34,197,94,.14);color:#4ade80;border:1px solid rgba(34,197,94,.35)}
.tier-B{background:rgba(245,158,11,.14);color:#fbbf24;border:1px solid rgba(245,158,11,.35)}
.tier-C{background:rgba(239,68,68,.14);color:#f87171;border:1px solid rgba(239,68,68,.35)}
.node.A{fill:#22c55e}.node.B{fill:#f59e0b}.node.C{fill:#ef4444}
.node.sel{fill:#fff;stroke:#fff;stroke-width:1.5}
.calc{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px;margin:16px 0}
.calc label{display:block;font-size:12.5px;color:#8b95ad;margin-bottom:6px}
.calc input{width:100%;padding:9px 11px;background:#0e1424;border:1px solid #1e2740;border-radius:8px;color:#e8ecf5;font-size:14px}
.calcbox{background:#0b1120;border:1px solid #1e2740;border-radius:12px;padding:18px;margin-top:16px}
.calcrow{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px dashed #1a2236;font-size:14px}
.calcrow:last-child{border:0;padding-top:14px;font-size:17px;font-weight:700}
.calcrow b{color:#22d3ee}
.big{font-size:26px;font-weight:800;color:#22d3ee}
.split{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:820px){.split{grid-template-columns:1fr}}
.plan{background:#0e1424;border:1px solid #1e2740;border-left:3px solid #22d3ee;border-radius:10px;padding:14px 16px;margin:12px 0}
.plan h4{margin:0 0 6px;font-size:14.5px}
.plan p{margin:0;font-size:13.5px;color:#98a3ba;line-height:1.65}

/* ===== 模板标注 / 地图提示 / 页脚 ===== */
.vbar{display:none;background:#3a2a08;border-bottom:1px solid #7c5a12;padding:8px 18px;font-size:12.5px;color:#fbbf24;
  align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
body.show-v .vbar{display:flex}
.vnote{position:relative}
body.show-v .vnote{outline:1px dashed #f59e0b;outline-offset:4px}
body.show-v .vnote-inline{outline:1px dashed #f59e0b;padding:1px 4px;border-radius:4px}
.vtag{display:none;background:#f59e0b;color:#1a1204;font-size:10.5px;font-weight:800;padding:1px 7px;
  border-radius:4px;margin-right:8px;letter-spacing:.5px;vertical-align:middle}
body.show-v .vtag{display:inline-block}
body.show-v .vnote:hover::after{content:attr(data-v);position:absolute;left:0;bottom:calc(100% + 8px);z-index:60;
  width:min(420px,80vw);background:#1a1204;border:1px solid #f59e0b;color:#fde68a;font-size:12px;line-height:1.6;
  padding:10px 12px;border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.5)}
.mapbox{position:relative;background:#0b1120;border:1px solid #1e2740;border-radius:12px;padding:6px;margin-bottom:14px}
.mapbox svg{width:100%;height:auto;display:block}
.tipbox{display:none;position:absolute;pointer-events:none;background:#111a2e;
  border:1px solid #2a3550;color:#e8ecf5;font-size:12px;padding:5px 10px;border-radius:7px;white-space:nowrap;z-index:20}
.legend i.dot{display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:5px;vertical-align:middle}
.legend i.a{background:#22c55e}.legend i.b{background:#f59e0b}.legend i.c{background:#ef4444}
.ul{margin:0;padding-left:20px;font-size:13.5px;color:#98a3ba;line-height:2}
.foot{margin:30px 0 46px;padding-top:22px;border-top:1px solid #1a2236;font-size:13px;color:#8b95ad;line-height:1.8}