:root{--fg:#0a0f0d;--tx:#2f3542;--mut:#4a5160;--line:#d9eae2;--soft:#f2faf7;--mint:#f6fcf9;--a:#047857;--a-d:#065f46;--a-soft:#e7f8f1;--g1:#10b981;--g2:#14b8a6;--ok:#065f46;--bad:#b42318;--r:22px}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:#fff;color:var(--tx);font:16px/1.78 -apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%}a{color:var(--a-d);text-underline-offset:3px}a:visited{color:var(--a-d)}
::selection{background:#bbf7d0;color:#052e16}
:focus-visible{outline:3px solid #34d399;outline-offset:2px}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:8px;background:#fff;padding:8px 14px;border-radius:8px;z-index:99}.skip:focus{left:8px}
h1,h2,h3,h4{color:var(--fg);margin:0;letter-spacing:-.02em;line-height:1.25}
/* 胶囊导航 */
.nav{position:sticky;top:0;z-index:50;padding:10px 16px;background:linear-gradient(#fff 60%,rgba(255,255,255,0))}
.nav-in{max-width:1040px;margin:0 auto;display:flex;align-items:center;gap:14px;padding:6px 8px 6px 18px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);box-shadow:0 8px 24px -14px rgba(6,95,70,.25)}
.nav-in.wrap{padding:6px 8px 6px 18px}
.brand{display:inline-flex;align-items:center;min-height:44px;text-decoration:none}
.logo{display:inline-flex;align-items:center;gap:10px;color:var(--fg)}
.logo-t{font-weight:800;font-size:19px;letter-spacing:.04em;display:inline-flex;align-items:baseline;gap:8px}
.logo-t em{font-style:normal;font-weight:500;font-size:13px;color:var(--mut);letter-spacing:0;padding-left:8px;border-left:1px solid var(--line)}
.nav-links{display:flex;gap:2px;margin-left:auto}
.nav-links a{padding:9px 13px;border-radius:999px;color:var(--tx);text-decoration:none;font-size:14.5px;font-weight:500;min-height:44px;display:inline-flex;align-items:center}
.nav-links a:hover{background:var(--soft);color:var(--fg)}.nav-links a[aria-current=page]{color:var(--a-d);background:var(--a-soft);font-weight:650}
.nav-cta{margin-left:2px}
.m-nav{display:none;margin-left:auto}
.m-nav summary{list-style:none;cursor:pointer;width:44px;height:44px;display:flex;align-items:center;justify-content:center;border-radius:999px;border:1px solid var(--line)}
.m-nav summary::-webkit-details-marker{display:none}
.m-nav summary span,.m-nav summary span::before,.m-nav summary span::after{display:block;width:18px;height:2px;background:var(--fg);border-radius:2px;position:relative;content:""}
.m-nav summary span::before{position:absolute;top:-6px}.m-nav summary span::after{position:absolute;top:6px}
.m-panel{position:absolute;left:0;right:0;top:calc(100% + 8px);background:#fff;border:1px solid var(--line);border-radius:22px;padding:8px 16px 12px;display:grid;box-shadow:0 24px 40px -24px rgba(6,95,70,.35)}
.m-panel a{padding:12px 4px;min-height:44px;color:var(--fg);text-decoration:none;border-bottom:1px solid var(--soft);font-weight:500}
/* 按钮：胶囊 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 22px;border-radius:999px;font-weight:650;font-size:15px;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s}
.btn-primary{background:linear-gradient(135deg,#047857,#0f766e);color:#fff!important;box-shadow:0 10px 22px -10px rgba(4,120,87,.6)}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 14px 26px -10px rgba(4,120,87,.65)}
.btn-ghost{background:#fff;color:var(--a-d)!important;border-color:#a7dcc8}.btn-ghost:hover{background:var(--soft)}
.btn-sm{padding:8px 18px;font-size:14px}.btn-lg{min-height:52px;padding:14px 30px;font-size:16px}.btn-block{width:100%}
/* hero：居中 + 点阵 */
.hero{position:relative;overflow:hidden;padding:56px 0 48px;text-align:center}
.hero-bg{position:absolute;inset:0;background:radial-gradient(40% 50% at 12% 18%,rgba(16,185,129,.18),transparent 70%),radial-gradient(40% 50% at 90% 12%,rgba(20,184,166,.18),transparent 70%),radial-gradient(#cfe8de 1px,transparent 1.200px);background-size:auto,auto,22px 22px;-webkit-mask-image:linear-gradient(#000 55%,transparent);mask-image:linear-gradient(#000 55%,transparent);z-index:0;pointer-events:none}
.hero .wrap{position:relative;z-index:1}
.pill{display:inline-flex;align-items:center;gap:6px;padding:5px 14px;border-radius:999px;background:var(--a-soft);color:var(--a-d);font-size:13px;font-weight:650;border:1px solid #bde8d6}
.hero h1{font-size:clamp(2.1rem,5vw,3.7rem);margin:18px auto 0;font-weight:820;letter-spacing:-.04em;line-height:1.16;max-width:52rem}
.hero h1 .grad{background:linear-gradient(90deg,#059669,#14b8a6);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:1.08rem;color:var(--tx);max-width:42rem;margin:18px auto 0}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px;justify-content:center}
.note{margin:26px auto 0;padding:12px 18px;border-radius:16px;background:#fffaf0;border:1px solid #f4dfb0;color:#5c4400;font-size:14px;max-width:44rem;text-align:left}
.hero-sub{padding:40px 0 28px;text-align:left}.hero-sub h1{font-size:clamp(1.9rem,3.8vw,2.7rem);margin-left:0}.hero-sub .lead{margin-left:0}
/* 关系链示意 */
.chain{margin:36px auto 0;max-width:860px;display:grid;grid-template-columns:1fr 64px 1fr;gap:0;align-items:center;text-align:left}
.node{border:1px solid var(--line);background:#fff;border-radius:20px;padding:16px 18px;box-shadow:0 14px 30px -20px rgba(6,95,70,.4);display:flex;gap:12px;align-items:flex-start}
.node b{display:block;font:650 14.5px/1.4 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--fg);word-break:break-all}.node span{font-size:13px;color:var(--mut);display:block;margin-top:2px}
.node .mock-ic{margin-top:2px}
.node-main{grid-row:span 2;border-color:#8fd3b9;background:linear-gradient(160deg,#ecfdf5,#f0fdfa)}
.node-bad{border-style:dashed;border-color:#f0b4ac;background:#fff8f7;box-shadow:none}
.arrows{grid-row:span 2;display:flex;flex-direction:column;align-items:center;justify-content:space-around;height:100%;color:var(--g1)}
.chain-side{display:grid;gap:14px}
.chain-foot{grid-column:1/-1;margin-top:16px}
.mock-ic{width:30px;height:30px;border-radius:10px;display:flex;align-items:center;justify-content:center;flex:none}
.ok{background:#dcfce7;color:var(--ok)}.bad{background:#fdecea;color:var(--bad)}.mid{background:#fff4dc;color:#7a5200}
.mock-cap{margin:14px 0 0;font-size:12.5px;color:var(--mut);text-align:center}
.stats{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px;justify-content:center}
.stat{padding:12px 20px;border:1px solid var(--line);border-radius:999px;background:#fff;display:flex;gap:10px;align-items:baseline}
.stat b{font-size:1.25rem;color:var(--a-d);letter-spacing:-.02em}.stat span{font-size:13px;color:var(--mut)}
/* 小节：左对齐标题 + 绿色短杠 */
.sec{padding:64px 0}.sec.alt{background:var(--mint);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:46rem;margin:0 0 32px}
.sec-head .pill{display:none}
.sec-head h2{font-size:clamp(1.55rem,2.8vw,2.2rem);font-weight:800;padding-left:16px;border-left:5px solid var(--g1);border-image:linear-gradient(var(--g1),var(--g2)) 1}
.sec-head p{color:var(--mut);margin:10px 0 0 21px}
.grid{display:grid;gap:16px}.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--mint);border:1px solid var(--line);border-radius:var(--r);padding:26px;display:flex;flex-direction:column;gap:8px;text-decoration:none;color:var(--tx);position:relative}
.card h3{font-size:1.06rem;font-weight:740}.card p{margin:0;font-size:15px}
.card-link{transition:border-color .15s,background .15s}.card-link:hover{border-color:#6ec9a8;background:#fff}
.ic{width:42px;height:42px;border-radius:50%;background:#fff;color:var(--a-d);display:flex;align-items:center;justify-content:center;margin-bottom:6px;border:1px solid #b6e4d1}
.more{margin-top:auto;padding-top:6px;color:var(--a-d);font-weight:650;font-size:14px}
.bento{display:grid;gap:16px;grid-template-columns:repeat(6,1fr)}.bento .card:nth-child(1),.bento .card:nth-child(2){grid-column:span 3}.bento .card:nth-child(n+3){grid-column:span 2}
.bento .card:nth-child(1){background:linear-gradient(160deg,#ecfdf5,#f0fdfa);border-color:#9fdcc3}
/* 时间线步骤 */
.tl{counter-reset:s;position:relative;max-width:46rem;margin:0;padding-left:0;display:grid;gap:18px}
.tl::before{content:"";position:absolute;left:19px;top:8px;bottom:8px;width:2px;background:linear-gradient(var(--g1),var(--g2));opacity:.45}
.tl-i{position:relative;padding-left:60px}
.tl-i::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:0;width:40px;height:40px;border-radius:50%;background:#fff;border:2px solid var(--g1);color:var(--a-d);font-weight:800;display:flex;align-items:center;justify-content:center}
.tl-i h3{font-size:1.06rem;margin-bottom:4px;padding-top:7px}.tl-i p{margin:0;font-size:15px}
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{font:600 14px/1 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;padding:10px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--fg)}
/* 表格：斑马纹 */
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:#fff}
.tbl table{width:100%;border-collapse:collapse;font-size:14.5px}
.tbl th{background:var(--a-soft);text-align:left;padding:12px 16px;color:var(--a-d);font-weight:750;white-space:nowrap}
.tbl td{padding:12px 16px;border-top:1px solid var(--line);vertical-align:top;color:var(--tx)}
.tbl tr:nth-child(even) td{background:#fafdfc}.tbl td:first-child{font-weight:650;color:var(--fg)}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13.5px}
/* 套餐 */
.plans{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.plan{background:#fff;border:1px solid var(--line);border-top:4px solid var(--g1);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:6px}
.plan-hot{border-color:#6ec9a8;border-top-color:var(--g2);box-shadow:0 0 0 4px rgba(20,184,166,.12)}
.plan-name{margin:0;font-weight:700;color:var(--mut);font-size:14px}.plan-price{margin:0;font-size:2rem;font-weight:820;color:var(--fg);letter-spacing:-.03em}
.plan-price .unit{font-size:14px;font-weight:600;color:var(--mut);margin-left:4px}.plan-traffic{margin:0;font-weight:600}.plan-sub{margin:0 0 12px;font-size:13px;color:var(--mut);min-height:20px}
.fine{font-size:13px;color:var(--mut);margin:16px 0 0}
/* FAQ：左侧绿条 */
.faq{max-width:48rem;margin:0;display:grid;gap:10px}
.faq details{background:#fff;border:1px solid var(--line);border-left:4px solid var(--g1);border-radius:14px}
.faq summary{cursor:pointer;list-style:none;padding:15px 20px;font-weight:680;color:var(--fg);display:flex;justify-content:space-between;gap:16px;min-height:44px;align-items:center}
.faq summary::-webkit-details-marker{display:none}.faq summary::after{content:"+";font-size:22px;color:var(--a-d);line-height:1}
.faq details[open] summary::after{content:"–"}.faq .ans{padding:0 20px 18px}.faq .ans p{margin:0}
/* 内容页 */
.prose{max-width:46rem;margin:0}.prose h2{font-size:1.5rem;margin:40px 0 12px;font-weight:780;padding-left:14px;border-left:4px solid var(--g1)}.prose h3{font-size:1.1rem;margin:26px 0 8px}
.prose p{margin:0 0 14px}.prose ul,.prose ol{padding-left:1.3em;margin:0 0 16px}.prose li{margin:6px 0}.prose li::marker{color:var(--a)}
.callout{margin:20px 0;padding:16px 18px;border-radius:16px;border:1px solid #b6e4d1;background:var(--a-soft);color:#064e3b}
.callout.warn{background:#fffaf0;border-color:#f4dfb0;color:#5c4400}
.band{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:34px 40px;border-radius:28px;background:linear-gradient(120deg,#ecfdf5 0%,#f0fdfa 100%);border:1px solid #b6e4d1}
.band h2{font-size:clamp(1.4rem,2.6vw,1.9rem)}.band p{margin:8px 0 0;color:var(--tx);max-width:34rem}
.crumb{display:flex;gap:8px;align-items:center;font-size:14px;color:var(--mut);padding-top:10px;flex-wrap:wrap}.crumb a{color:var(--mut);min-height:44px;display:inline-flex;align-items:center}
/* 页脚（浅色） */
.foot{margin-top:32px;background:var(--mint);border-top:1px solid var(--line);padding:48px 0 28px}
.foot-in{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:32px}
.foot-brand p{margin:14px 0 0;color:var(--mut);font-size:14.5px;max-width:26rem}
.foot h4{font-size:14px;margin-bottom:10px;color:var(--fg)}.foot-in a{display:flex;align-items:center;min-height:36px;color:var(--tx);text-decoration:none;font-size:14.5px}.foot-in a:hover{color:var(--a-d)}
.foot-fine{margin-top:28px;padding-top:20px;border-top:1px solid var(--line)}.foot-fine p{margin:0 0 8px;font-size:13px;color:var(--mut)}
@media(max-width:960px){.g4,.plans{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:1fr 1fr}.bento{grid-template-columns:1fr 1fr}.bento .card:nth-child(n){grid-column:span 1}}
@media(max-width:860px){.nav-links,.nav-cta{display:none}.m-nav{display:block}.nav-in{position:relative}.band{flex-direction:column;align-items:flex-start;padding:28px 24px}.foot-in{grid-template-columns:1fr 1fr}.foot-brand{grid-column:1/-1}}
@media(max-width:640px){.foot-in a{min-height:44px}.wrap{padding:0 16px}.hero{padding:36px 0 36px}.sec{padding:48px 0}.g2,.g3,.g4,.plans,.bento{grid-template-columns:1fr}.logo-t em{display:none}.tbl th,.tbl td{padding:10px 12px}.btn-lg{width:100%}
.chain{grid-template-columns:1fr;gap:12px}.arrows{display:none}.node-main{grid-row:auto}.chain-side{gap:12px}.chain-foot{margin-top:0}.stat{flex:1 1 40%}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}