/* ============ tunnelbox 官网样式 ============ */
:root{
  --bg:#0a0d12;
  --bg-soft:#0d1118;
  --bg-alt:#0f141d;
  --panel:#111722;
  --panel-hi:#151c29;
  --border:rgba(148,163,184,.13);
  --border-soft:rgba(148,163,184,.08);
  --text:#e7ecf3;
  --muted:#9aa4b5;
  --faint:#5c6675;
  --accent:#22d3ee;
  --accent2:#818cf8;
  --ok:#34d399;
  --warn:#fbbf24;
  --radius:16px;
  --radius-s:10px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --grad:linear-gradient(100deg,#22d3ee 0%,#818cf8 60%,#c084fc 100%);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:86px}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:rgba(34,211,238,.28)}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img,svg{display:block}
b,strong{font-weight:600}

/* ---------- 通用 ---------- */
.container{width:min(1080px,92%);margin:0 auto}
.container-narrow{width:min(860px,92%)}
.section{padding:96px 0 40px}
.section-alt{background:
  radial-gradient(1200px 400px at 15% -5%,rgba(34,211,238,.05),transparent 60%),
  radial-gradient(900px 360px at 90% 0%,rgba(129,140,248,.05),transparent 55%),
  var(--bg-soft);
}
.eyebrow{
  text-transform:uppercase;letter-spacing:.14em;font-size:12.5px;font-weight:600;
  color:var(--accent);margin-bottom:14px;
}
h1,h2,h3,h4{line-height:1.25;font-weight:700;letter-spacing:-.01em}
.section h2{font-size:clamp(26px,3.6vw,40px);margin-bottom:14px}
.section-sub{color:var(--muted);max-width:680px;font-size:16px;margin-bottom:44px}
.card{
  background:linear-gradient(180deg,rgba(21,26,38,.72),rgba(16,21,29,.9));
  border:1px solid var(--border);
  border-radius:var(--radius);
}
.grad{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:999px;font-weight:600;font-size:15px;
  border:1px solid transparent;cursor:pointer;transition:.18s ease;
  white-space:nowrap;
}
.btn-primary{
  color:#04121a;
  background:var(--grad);
  box-shadow:0 6px 24px -8px rgba(34,211,238,.55);
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 10px 30px -6px rgba(34,211,238,.6);filter:brightness(1.06)}
.btn-ghost{
  color:var(--text);background:transparent;
  border-color:var(--border);
}
.btn-ghost:hover{border-color:rgba(34,211,238,.5);color:var(--accent);background:rgba(34,211,238,.05)}
.text-link{color:var(--accent);font-weight:600}
.text-link:hover{text-decoration:underline}
.code-chip{
  font-family:var(--mono);font-size:.92em;
  background:rgba(34,211,238,.12);color:#7deefc;
  border:1px solid rgba(34,211,238,.3);
  padding:1px 8px;border-radius:6px;
}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;inset:0 0 auto;z-index:50;
  backdrop-filter:blur(14px);
  background:rgba(10,13,18,.78);
  border-bottom:1px solid var(--border-soft);
}
.nav-inner{
  width:min(1080px,92%);margin:0 auto;height:64px;
  display:flex;align-items:center;gap:28px;
}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700}
.brand-mark{
  width:26px;height:26px;border-radius:8px;position:relative;flex:0 0 auto;
  background:radial-gradient(circle at 32% 32%,rgba(34,211,238,.25),transparent 60%);
  border:1px solid rgba(34,211,238,.5);
}
.brand-mark::before,.brand-mark::after{content:"";position:absolute;width:7px;height:7px;border-radius:50%;top:50%;margin-top:-3.5px}
.brand-mark::before{left:3px;background:var(--accent);box-shadow:0 0 8px rgba(34,211,238,.9)}
.brand-mark::after{right:3px;background:var(--accent2);box-shadow:0 0 8px rgba(129,140,248,.9)}
.brand-mark i{
  position:absolute;left:12px;top:3px;bottom:3px;width:1px;
  background:repeating-linear-gradient(180deg,var(--faint) 0 2px,transparent 2px 4px);
}
.brand-name{font-family:var(--mono);font-size:17px;letter-spacing:-.02em}
.nav-links{display:flex;gap:22px;margin:0 auto}
.nav-links a{color:var(--muted);font-size:14.5px;transition:.15s}
.nav-links a:hover{color:var(--text)}
.nav-drop{position:relative}
.nav-drop-toggle{
  background:none;border:0;color:var(--muted);font-family:inherit;font-size:14.5px;cursor:pointer;
  display:inline-flex;align-items:center;gap:6px;padding:0;transition:.15s;
}
.nav-drop-toggle:hover{color:var(--text)}
.nav-drop-toggle::after{content:"";width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;transition:.15s}
.nav-drop.open .nav-drop-toggle{color:var(--text)}
.nav-drop.open .nav-drop-toggle::after{transform:rotate(180deg)}
.nav-drop-menu{
  position:absolute;top:calc(100% + 12px);left:50%;transform:translateX(-50%);
  min-width:200px;background:#0d1118;border:1px solid var(--border);border-radius:12px;
  padding:6px;display:none;flex-direction:column;z-index:60;
  box-shadow:0 16px 40px -12px rgba(0,0,0,.6);
}
.nav-drop.open .nav-drop-menu{display:flex;animation:fadeIn .18s ease}
.nav-drop-menu a{padding:8px 12px;border-radius:8px;color:var(--muted);font-size:13.5px;white-space:nowrap;transition:.12s}
.nav-drop-menu a:hover{background:rgba(34,211,238,.1);color:#7deefc}
.nav-actions{display:flex;align-items:center;gap:14px}
.lang-switch{display:flex;border:1px solid var(--border);border-radius:999px;padding:2px}
.lang-btn{
  background:transparent;border:0;color:var(--muted);cursor:pointer;
  font-family:inherit;font-size:12.5px;padding:4px 11px;border-radius:999px;transition:.15s;
}
.lang-btn.is-active{background:rgba(34,211,238,.16);color:var(--accent);font-weight:600}
.nav-gh{color:var(--muted);display:inline-flex;transition:.15s}
.nav-gh:hover{color:var(--text)}
.theme-toggle{
  background:none;border:0;color:var(--muted);cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;padding:4px;border-radius:8px;transition:.15s;
}
.theme-toggle:hover{color:var(--text)}
.theme-toggle svg{width:18px;height:18px}
.icon-sun{display:block}
.icon-moon{display:none}
html[data-theme="light"] .icon-sun{display:none}
html[data-theme="light"] .icon-moon{display:block}
.nav-burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-burger span{width:20px;height:2px;background:var(--text);border-radius:2px;transition:.2s}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{position:relative;padding:150px 0 56px;overflow:hidden}
.hero-glow,.cta-glow{
  position:absolute;inset:auto;pointer-events:none;
  width:900px;height:900px;border-radius:50%;filter:blur(90px);
  background:
    radial-gradient(closest-side,rgba(34,211,238,.16),transparent 70%),
    radial-gradient(closest-side,rgba(129,140,248,.12),transparent 70%);
  top:-380px;left:50%;transform:translateX(-50%);
}
.hero-inner{
  width:min(1080px,92%);margin:0 auto;
  display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center;position:relative;
}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  border:1px solid var(--border);border-radius:999px;
  padding:6px 14px;font-size:13px;color:var(--muted);
  background:rgba(17,23,34,.7);margin-bottom:22px;
}
.badge-dot{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 10px var(--ok);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.hero h1{font-size:clamp(34px,5.4vw,62px);letter-spacing:-.025em;margin-bottom:20px}
.hero-sub{color:var(--muted);font-size:17px;max-width:560px;margin-bottom:30px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-meta{margin-top:20px;color:var(--faint);font-size:13.5px}

/* terminal */
.terminal{
  background:#0b0f16;border:1px solid var(--border);
  border-radius:14px;overflow:hidden;box-shadow:
    0 30px 80px -30px rgba(0,0,0,.8),
    0 0 0 1px rgba(34,211,238,.06) inset;
  font-family:var(--mono);font-size:13px;
}
.terminal-bar{
  display:flex;align-items:center;gap:7px;
  padding:11px 14px;border-bottom:1px solid var(--border-soft);background:rgba(255,255,255,.02);
}
.tb-dot{width:11px;height:11px;border-radius:50%;background:#3a4354}
.tb-dot:nth-child(1){background:#ff5f57}
.tb-dot:nth-child(2){background:#febc2e}
.tb-dot:nth-child(3){background:#28c840}
.tb-title{margin-left:8px;color:var(--faint);font-size:12px}
.terminal-body{padding:16px 18px;display:flex;flex-direction:column;gap:9px;overflow-x:auto}
.terminal-body .line{white-space:nowrap}
.c-dim{color:var(--faint)}
.c-ok{color:var(--ok)}
.c-dim b{color:#8fa3bd;font-weight:600}
.small{font-size:12px}
.cursor{display:inline-block;color:var(--accent);animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.terminal-qr{margin:4px 0 2px;width:176px;height:176px;border-radius:10px}
.terminal-qr canvas{width:176px;height:176px;image-rendering:pixelated;border-radius:8px}

/* hero strip */
.hero-strip{border-top:1px solid var(--border-soft);margin-top:64px}
.hero-strip-inner{
  width:min(1080px,92%);margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  padding:22px 0;color:var(--faint);font-size:13.5px;
}
.hero-strip-inner i{width:4px;height:4px;border-radius:50%;background:var(--accent);opacity:.6}

/* ---------- 特性 ---------- */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feature-card{padding:26px;transition:.2s ease;position:relative}
.feature-card:hover{transform:translateY(-3px);border-color:rgba(34,211,238,.35)}
.feature-icon{width:46px;height:46px;border-radius:12px;margin-bottom:18px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,rgba(34,211,238,.14),rgba(129,140,248,.14));
  border:1px solid rgba(34,211,238,.22)}
.feature-icon svg{width:24px;height:24px;color:#7deefc}
.feature-card h3{font-size:17.5px;margin-bottom:8px}
.feature-card p{color:var(--muted);font-size:14.5px}

/* ---------- 支持矩阵 ---------- */
.matrix{width:100%;border-collapse:collapse;font-size:14.5px}
.matrix th,.matrix td{padding:15px 20px;text-align:left}
.matrix thead th{color:var(--faint);font-weight:600;font-size:12.5px;letter-spacing:.05em;border-bottom:1px solid var(--border)}
.matrix tbody tr{border-bottom:1px solid var(--border-soft);transition:.12s}
.matrix tbody tr:last-child{border-bottom:0}
.matrix tbody tr:hover{background:rgba(255,255,255,.025)}
.table-wrap{overflow-x:auto}
.ag{display:flex;align-items:center;gap:11px;font-weight:600}
.ag-logo{
  width:30px;height:30px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:11px;font-weight:700;color:#fff;flex:0 0 auto;
  background:linear-gradient(140deg,var(--ag,#5b8dff),color-mix(in srgb,var(--ag,#5b8dff),#000 45%));
  box-shadow:0 0 0 1px rgba(255,255,255,.08) inset;
}
.tag{font-family:var(--mono);font-size:11px;font-weight:600;padding:2px 8px;border-radius:6px;border:1px solid}
.tag-a{color:#7deefc;border-color:rgba(34,211,238,.35);background:rgba(34,211,238,.08)}
.tag-b{color:#c3b0ff;border-color:rgba(139,92,246,.4);background:rgba(139,92,246,.1)}
.status{font-size:13.5px}
.status.ok{color:var(--ok)}
.status.warn{color:var(--warn)}
.legend{margin-top:20px;color:var(--muted);font-size:13.5px;line-height:2}
.legend .tag{vertical-align:1px}

/* ---------- 工作原理 ---------- */
.arch{display:flex;align-items:stretch;gap:0;margin-bottom:26px;position:relative}
.arch-card{flex:1;padding:26px;min-width:0}
.arch-card.arch-relay{background:
  radial-gradient(300px 160px at 50% 0%,rgba(129,140,248,.08),transparent 70%);
}
.arch-icon{width:42px;height:42px;margin-bottom:14px;border-radius:11px;display:flex;align-items:center;justify-content:center;
  background:rgba(129,140,248,.12);border:1px solid rgba(139,92,246,.25)}
.arch-icon svg{width:22px;height:22px;color:#c3b0ff}
.arch-card h3{font-size:17px;margin-bottom:2px}
.arch-sub{color:var(--faint);font-size:13px;margin-bottom:12px}
.arch-list{display:flex;flex-direction:column;gap:8px}
.arch-list li{color:var(--muted);font-size:13.5px;padding-left:16px;position:relative}
.arch-list li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:2px;background:var(--grad)}
.arch-arrow{width:64px;flex:0 0 64px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:var(--faint)}
.arch-arrow svg{width:26px;height:26px}
.how-notes{display:grid;grid-template-columns:repeat(3,1fr);gap:0;overflow:hidden}
.how-notes .note{padding:24px 26px;border-right:1px solid var(--border-soft)}
.how-notes .note:last-child{border-right:0}
.note strong{font-size:15.5px;display:block;margin-bottom:8px}
.note p{color:var(--muted);font-size:14px}

/* ---------- 下载 ---------- */
.dl-grid{display:grid;grid-template-columns:minmax(0,720px);gap:18px;margin-bottom:26px}
.dl-main{padding:30px;display:flex;gap:30px;align-items:center}
.dl-qr-box{text-align:center;flex:0 0 auto}
.qr-canvas{width:180px;height:180px;background:#fff;border-radius:12px;padding:0;display:flex;align-items:center;justify-content:center;overflow:hidden}
.qr-canvas img,.qr-canvas canvas{width:180px;height:180px;display:block}
.qr-canvas a{color:#0b0e14;font-weight:700;font-size:13.5px;text-decoration:underline;padding:12px;text-align:center}
.qr-hint{color:var(--faint);font-size:12.5px;margin-top:10px}
.dl-info h3{font-size:22px;margin:8px 0 6px}
.dl-info>p{color:var(--muted);font-size:14.5px;margin-bottom:20px}
.platform-chip{display:inline-block;font-family:var(--mono);font-size:12px;color:#7deefc;background:rgba(34,211,238,.1);border:1px solid rgba(34,211,238,.3);padding:3px 12px;border-radius:999px}
.dl-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:12px}

/* ---------- 教程 ---------- */
.steps{display:flex;flex-direction:column;gap:18px;margin-bottom:26px}
.step{padding:24px 26px}
.step-head{display:flex;gap:16px;margin-bottom:16px}
.step-index{
  flex:0 0 auto;width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-weight:700;color:#04121a;background:var(--grad);font-size:15px;margin-top:2px;
}
.step h3{font-size:17px;margin-bottom:4px}
.step-head p{color:var(--muted);font-size:14px}
.step code{font-family:var(--mono);font-size:.92em;background:rgba(148,163,184,.12);padding:1px 6px;border-radius:6px;color:#dbe4f0}
pre{background:#0a0e15;border:1px solid var(--border-soft);border-radius:10px;padding:14px 18px;overflow-x:auto;font-family:var(--mono);font-size:13px;line-height:1.7;color:#c8d3e0}
pre .c-dim{color:#4d5768}
.more{padding:28px 30px}
.more h3{font-size:19px;margin-bottom:16px}
.more ul{display:flex;flex-direction:column;gap:12px}
.more li{color:var(--muted);font-size:14.5px;line-height:1.7}
.more li strong{color:var(--text)}
.more li code{font-family:var(--mono);background:rgba(148,163,184,.12);padding:1px 6px;border-radius:6px;color:#dbe4f0}
.more-links{display:flex;gap:26px;margin-top:22px;flex-wrap:wrap}

/* ---------- 安装手册 ---------- */
.manual{margin-bottom:26px}
.manual-title{font-size:22px;margin-bottom:6px}
.manual-sub{color:var(--muted);font-size:14.5px;margin-bottom:20px}
.agent-tabs{display:flex;gap:8px;overflow-x:auto;padding-bottom:10px;margin-bottom:18px;scrollbar-width:thin}
.agent-tab{
  flex:0 0 auto;padding:8px 16px;border-radius:999px;border:1px solid var(--border);
  background:transparent;color:var(--muted);font-family:var(--font);font-size:13.5px;font-weight:600;cursor:pointer;transition:.15s;
}
.agent-tab:hover{color:var(--text);border-color:rgba(34,211,238,.4)}
.agent-tab.is-active{background:var(--grad);color:#04121a;border-color:transparent;box-shadow:0 4px 14px -6px rgba(34,211,238,.5)}
.agent-panel{display:none}
.agent-panel.is-active{display:block;animation:fadeIn .25s ease}
.manual .relay-env{margin:-6px 0 16px}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.agent-panel .guide-block{margin-bottom:14px}
.guide-block{padding:20px 24px}
.guide-block-title{font-size:15px;margin-bottom:12px}
.guide-checklist{display:flex;flex-direction:column;gap:8px}
.guide-checklist li{color:var(--muted);font-size:14px;padding-left:26px;position:relative}
.guide-checklist li::before{
  content:"";position:absolute;left:0;top:3px;width:17px;height:17px;border-radius:50%;
  background:rgba(52,211,153,.15);border:1px solid rgba(52,211,153,.4);
}
.guide-checklist li::after{
  content:"";position:absolute;left:5px;top:8px;width:7px;height:4px;
  border-left:2px solid var(--ok);border-bottom:2px solid var(--ok);transform:rotate(-45deg);
}
.guide-step{margin-bottom:14px}
.guide-step:last-child{margin-bottom:0}
.guide-step-head{display:flex;align-items:baseline;gap:10px;margin-bottom:10px;font-size:14.5px}
.guide-step-num{
  flex:0 0 auto;width:22px;height:22px;border-radius:7px;display:inline-flex;align-items:center;justify-content:center;
  background:var(--grad);color:#fff;font-family:var(--mono);font-size:12px;font-weight:700;transform:translateY(3px);
}
.guide-step-d{color:var(--muted);font-size:14px;margin:0 0 10px 32px}
.guide-ok{margin-top:12px;font-size:14px;color:var(--ok)}
.guide-cfg-d{color:var(--muted);font-size:14px;margin-bottom:12px}
.guide-note{margin-top:12px;color:var(--muted);font-size:13.5px;line-height:1.7}
.guide-note code,.guide-cfg-d code,.guide-step-head code,.guide-step-d code{font-family:var(--mono);font-size:.9em;background:rgba(148,163,184,.12);padding:1px 5px;border-radius:5px;color:#dbe4f0}
.codebox{position:relative}
.codebox pre{padding:14px 46px 14px 18px}
.copy-btn{
  position:absolute;top:8px;right:8px;width:30px;height:30px;border-radius:8px;
  display:inline-flex;align-items:center;justify-content:center;cursor:pointer;
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);color:#9fb2c9;transition:.15s;
}
.copy-btn:hover{background:rgba(34,211,238,.16);color:#7deefc}
.copy-btn svg{width:15px;height:15px}
.copy-btn.copied{background:rgba(52,211,153,.16);color:#34d399;border-color:rgba(52,211,153,.4)}

/* ---------- FAQ ---------- */
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{padding:0;overflow:hidden}
.faq-item summary{
  list-style:none;cursor:pointer;padding:18px 22px;font-weight:600;font-size:15.5px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;transition:.15s;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";font-size:22px;font-weight:400;color:var(--accent);flex:0 0 auto;
  transition:transform .2s;line-height:1;
}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item summary:hover{color:#7deefc}
.faq-item p{padding:0 22px 20px;color:var(--muted);font-size:14.5px}
.faq-item p b{color:var(--text)}

/* ---------- CTA ---------- */
.cta{position:relative;text-align:center;padding:110px 20px;overflow:hidden;border-top:1px solid var(--border-soft)}
.cta h2{font-size:clamp(26px,3.8vw,40px);margin-bottom:14px;position:relative}
.cta p{color:var(--muted);max-width:560px;margin:0 auto 30px;font-size:16px;position:relative}
.cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;position:relative}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--border-soft);padding:60px 0 30px;background:var(--bg-soft)}
.footer-inner{width:min(1080px,92%);margin:0 auto;display:flex;gap:60px;justify-content:space-between;flex-wrap:wrap}
.footer-brand .brand{margin-bottom:14px}
.footer-brand p{color:var(--faint);font-size:14px}
.footer-links{display:flex;gap:64px;flex-wrap:wrap}
.footer-col{display:flex;flex-direction:column;gap:10px}
.footer-col h5{color:var(--muted);font-size:13px;text-transform:uppercase;letter-spacing:.08em;margin-bottom:8px}
.footer-col a{color:var(--faint);font-size:14px;transition:.15s}
.footer-col a:hover{color:var(--accent)}
.footer-legal{
  width:min(1080px,92%);margin:44px auto 0;padding-top:22px;border-top:1px solid var(--border-soft);
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;color:var(--faint);font-size:12.5px;
}

/* ---------- 响应式 ---------- */
@media(max-width:960px){
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .how-notes{grid-template-columns:1fr}
  .how-notes .note{border-right:0;border-bottom:1px solid var(--border-soft)}
  .how-notes .note:last-child{border-bottom:0}
  .arch{flex-direction:column}
  .arch-arrow{flex-direction:row;width:100%;height:56px;flex:0 0 56px}
  .dl-grid{grid-template-columns:1fr}
}
@media(max-width:720px){
  .section{padding:72px 0 30px}
  .nav-links{
    position:fixed;top:64px;left:0;right:0;flex-direction:column;gap:0;
    background:rgba(10,13,18,.98);border-bottom:1px solid var(--border-soft);
    padding:8px 6%;display:none;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 0;border-bottom:1px solid var(--border-soft);font-size:15px}
  .nav-drop{width:100%}
  .nav-drop-toggle{width:100%;justify-content:space-between;padding:13px 0;border-bottom:1px solid var(--border-soft);font-size:15px;color:var(--text)}
  .nav-drop-menu{position:static;transform:none;min-width:0;width:100%;background:transparent;border:0;padding:4px 0 8px;box-shadow:none}
  .nav-drop-menu a{padding:10px 6px;font-size:14px;border-radius:8px}
  .nav-drop-menu a::before{content:"· ";color:var(--accent)}
  .nav-drop.open .nav-drop-toggle::after{transform:rotate(180deg)}
  .nav-burger{display:flex}
  .nav-gh{display:none}
  .features-grid{grid-template-columns:1fr}
  .dl-main{flex-direction:column;text-align:center;padding:26px}
  .dl-actions{justify-content:center}
  .hero-strip-inner{justify-content:flex-start}
}
@media(max-width:520px){
  .hero{padding-top:128px}
  .matrix th,.matrix td{padding:12px 14px}
  .footer-inner{gap:34px}
  .footer-links{gap:34px}
  .guide-block{padding:16px}
  .guide-step-head{font-size:14px}
  .agent-tab{padding:7px 13px;font-size:13px}
}

/* ============ 白色主题（可选切换，默认深色） ============ */
html[data-theme="light"]{
  --bg:#f7f9fc;
  --bg-soft:#ffffff;
  --bg-alt:#eef1f6;
  --panel:#ffffff;
  --panel-hi:#f5f8fb;
  --border:rgba(15,23,42,.10);
  --border-soft:rgba(15,23,42,.06);
  --text:#182230;
  --muted:#5b6472;
  --faint:#7b8696;
  --accent:#0e7490;
  --accent2:#5b5bd6;
  --ok:#059669;
  --warn:#d97706;
}
html[data-theme="light"] .card{background:#fff;box-shadow:0 1px 2px rgba(15,23,42,.04)}
html[data-theme="light"] .nav{background:rgba(247,249,252,.85)}
html[data-theme="light"] .badge{background:#fff}
html[data-theme="light"] .hero-glow,html[data-theme="light"] .cta-glow{
  background:
    radial-gradient(closest-side,rgba(34,211,238,.14),transparent 70%),
    radial-gradient(closest-side,rgba(99,102,241,.10),transparent 70%);
}
html[data-theme="light"] .hero-strip-inner{color:var(--muted)}
html[data-theme="light"] .feature-card:hover{border-color:rgba(14,116,144,.35)}
html[data-theme="light"] .feature-icon{background:rgba(14,116,144,.08);border-color:rgba(14,116,144,.18)}
html[data-theme="light"] .feature-icon svg{color:#0e7490}
html[data-theme="light"] .matrix tbody tr:hover{background:rgba(15,23,42,.04)}
html[data-theme="light"] .tag-a{color:#0e7490;border-color:rgba(14,116,144,.30);background:rgba(14,116,144,.08)}
html[data-theme="light"] .tag-b{color:#5b5bd6;border-color:rgba(91,91,214,.35);background:rgba(91,91,214,.08)}
html[data-theme="light"] .arch-card.arch-relay{background:radial-gradient(300px 160px at 50% 0%,rgba(99,102,241,.07),transparent 70%)}
html[data-theme="light"] .arch-icon{background:rgba(91,91,214,.08);border-color:rgba(91,91,214,.22)}
html[data-theme="light"] .arch-icon svg{color:#5b5bd6}
html[data-theme="light"] .platform-chip{color:#0e7490;background:rgba(14,116,144,.08);border-color:rgba(14,116,144,.25)}
html[data-theme="light"] .step-card{background:rgba(15,23,42,.03)}
html[data-theme="light"] .step-card h4{color:#3b4657}
html[data-theme="light"] .step code,html[data-theme="light"] .more li code{
  background:rgba(15,23,42,.07);color:#1c2b3a;
}
html[data-theme="light"] .guide-note code,html[data-theme="light"] .guide-cfg-d code,
html[data-theme="light"] .guide-step-head code,html[data-theme="light"] .guide-step-d code{
  background:rgba(15,23,42,.07);color:#1c2b3a;
}
html[data-theme="light"] .guide-checklist li::before{background:rgba(5,150,105,.12);border-color:rgba(5,150,105,.4)}
html[data-theme="light"] .faq-item summary:hover{color:var(--accent)}
html[data-theme="light"] .nav-drop-menu{background:#fff;box-shadow:0 16px 40px -14px rgba(15,23,42,.25)}
html[data-theme="light"] .nav-drop-menu a:hover{background:rgba(14,116,144,.08);color:#0e7490}

/* 白色主题下终端/代码块保持深色对比，内部配色钉回深色值 */
html[data-theme="light"] .terminal{background:#0b0f16;border-color:rgba(255,255,255,.08)}
html[data-theme="light"] .c-dim{color:#5c6675}
html[data-theme="light"] .c-ok{color:#34d399}
html[data-theme="light"] .cursor{color:#22d3ee}