:root{--fg:#0b0d12;--tx:#2f3542;--mut:#4a5160;--line:#e5e8ef;--soft:#f6f7fb;--a:#4f46e5;--a-d:#4338ca;--a-soft:#eef0ff;--c:#06b6d4;--ok:#0f766e;--bad:#b42318;--r:16px;--sh:0 1px 2px rgba(16,24,40,.04),0 8px 24px -12px rgba(16,24,40,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:#fff;color:var(--tx);font:16px/1.75 -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}
.wrap{max-width:1120px;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}
/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:20px;min-height:64px}
.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:750;font-size:19px;letter-spacing:-.03em;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:4px;margin-left:auto}
.nav-links a{padding:10px 12px;border-radius:10px;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)}
.nav-cta{margin-left:6px}
.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:12px;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:100%;background:#fff;border-bottom:1px solid var(--line);padding:8px 24px 16px;display:grid;box-shadow:0 20px 30px -20px rgba(16,24,40,.25)}
.m-panel a{padding:12px 4px;min-height:44px;color:var(--fg);text-decoration:none;border-bottom:1px solid var(--soft);font-weight:500}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 20px;border-radius:12px;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,#4f46e5,#4338ca);color:#fff;box-shadow:0 8px 20px -8px rgba(79,70,229,.55)}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 24px -8px rgba(79,70,229,.6)}
.btn-ghost{background:#fff;color:var(--fg);border-color:#d5d9e3}.btn-ghost:hover{background:var(--soft)}
.btn-sm{min-height:44px;padding:8px 16px;font-size:14px}.btn-lg{min-height:52px;padding:14px 28px;font-size:16px}.btn-block{width:100%}
/* hero */
.hero{position:relative;overflow:hidden;padding:72px 0 64px}
.hero-bg{position:absolute;inset:-20% -10% auto -10%;height:520px;background:radial-gradient(60% 60% at 18% 20%,rgba(79,70,229,.14),transparent 70%),radial-gradient(50% 55% at 85% 10%,rgba(6,182,212,.14),transparent 70%);z-index:0;pointer-events:none}
.hero .wrap{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.pill{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:999px;background:var(--a-soft);color:var(--a-d);font-size:13px;font-weight:650;border:1px solid #dfe2ff}
.hero h1{font-size:clamp(2rem,4.6vw,3.4rem);margin:18px 0 0;font-weight:800;letter-spacing:-.035em;line-height:1.18}
.hero h1 .grad{background:linear-gradient(90deg,#4f46e5,#06b6d4);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:1.08rem;color:var(--tx);max-width:40rem;margin:18px 0 0}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.stats{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.stat{padding:12px 18px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:var(--sh);min-width:120px}
.stat b{display:block;font-size:1.35rem;color:var(--fg);letter-spacing:-.02em}.stat span{font-size:13px;color:var(--mut)}
.note{margin-top:22px;padding:12px 16px;border-radius:12px;background:#fffaf0;border:1px solid #f4dfb0;color:#5c4400;font-size:14px;max-width:40rem}
.hero-sub{padding:56px 0 40px}.hero-sub h1{font-size:clamp(1.9rem,3.8vw,2.8rem)}
/* mock */
.mock{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:0 30px 60px -30px rgba(16,24,40,.28),var(--sh);overflow:hidden}
.mock-bar{display:flex;align-items:center;gap:8px;padding:12px 16px;background:var(--soft);border-bottom:1px solid var(--line)}
.mock-bar i{width:10px;height:10px;border-radius:50%;background:#d5d9e3;display:block}
.mock-row{display:flex;align-items:center;gap:12px;padding:14px 18px;border-bottom:1px solid var(--soft)}
.mock-row:last-child{border-bottom:0}
.mock-url{flex:1;font:600 14px/1.4 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--fg);word-break:break-all}
.mock-tag{font-size:12.5px;font-weight:650;padding:3px 10px;border-radius:999px;white-space:nowrap}
.ok{background:#e6f6f2;color:var(--ok)}.bad{background:#fdecea;color:var(--bad)}.mid{background:#fff4dc;color:#7a5200}
.mock-ic{width:30px;height:30px;border-radius:9px;display:flex;align-items:center;justify-content:center;flex:none}
.mock-cap{padding:10px 18px 14px;font-size:12.5px;color:var(--mut)}
/* sections */
.sec{padding:72px 0}.sec.alt{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{text-align:center;max-width:44rem;margin:0 auto 40px}
.sec-head h2{font-size:clamp(1.6rem,3vw,2.3rem);margin-top:14px;font-weight:780}
.sec-head p{color:var(--mut);margin:12px 0 0}
.grid{display:grid;gap:18px}.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;box-shadow:var(--sh);display:flex;flex-direction:column;gap:8px;text-decoration:none;color:var(--tx)}
.card h3{font-size:1.06rem;font-weight:720}.card p{margin:0;color:var(--tx);font-size:15px}
.card-link{transition:transform .15s,border-color .15s}.card-link:hover{transform:translateY(-2px);border-color:#c9cdfa}
.ic{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,#eef0ff,#e6fafd);color:var(--a-d);display:flex;align-items:center;justify-content:center;margin-bottom:6px;border:1px solid #e1e4ff}
.more{margin-top:auto;padding-top:6px;color:var(--a-d);font-weight:650;font-size:14px}
.steps{counter-reset:s;display:grid;gap:16px;grid-template-columns:repeat(3,1fr)}
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;box-shadow:var(--sh)}
.step::before{counter-increment:s;content:counter(s);display:inline-flex;width:32px;height:32px;border-radius:10px;align-items:center;justify-content:center;background:var(--a-soft);color:var(--a-d);font-weight:800;margin-bottom:10px;border:1px solid #dfe2ff}
.step h3{font-size:1.04rem;margin-bottom:6px}.step p{margin:0;font-size:15px}
.chips{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.chip{font:600 14px/1 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;padding:10px 14px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--fg)}
/* table */
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:#fff;box-shadow:var(--sh)}
.tbl table{width:100%;border-collapse:collapse;font-size:14.5px}
.tbl th{background:var(--soft);text-align:left;padding:12px 16px;color:var(--fg);font-weight:700;white-space:nowrap}
.tbl td{padding:12px 16px;border-top:1px solid var(--line);vertical-align:top;color:var(--tx)}
.tbl td:first-child{font-weight:650;color:var(--fg)}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13.5px}
/* plans */
.plans{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.plan{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:6px;box-shadow:var(--sh)}
.plan-hot{border-color:#b9bdf8;box-shadow:0 0 0 3px rgba(79,70,229,.10),var(--sh)}
.plan-name{margin:0;font-weight:700;color:var(--mut);font-size:14px}.plan-price{margin:0;font-size:2rem;font-weight:800;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 */
.faq{max-width:48rem;margin:0 auto;display:grid;gap:12px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--sh)}
.faq summary{cursor:pointer;list-style:none;padding:16px 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}
/* content pages */
.prose{max-width:46rem;margin:0 auto}.prose h2{font-size:1.5rem;margin:40px 0 12px;font-weight:760}.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}
.callout{margin:20px 0;padding:16px 18px;border-radius:14px;border:1px solid #dfe2ff;background:var(--a-soft);color:#2b2f7a}
.callout.warn{background:#fffaf0;border-color:#f4dfb0;color:#5c4400}
.band{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:36px 40px;border-radius:24px;background:linear-gradient(135deg,#eef0ff 0%,#e8fafd 100%);border:1px solid #dde1ff}
.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:18px;padding-bottom:0;flex-wrap:wrap}.crumb a{color:var(--mut);min-height:44px;display:inline-flex;align-items:center}
/* footer */
.foot{margin-top:32px;background:var(--soft);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){.hero-grid{grid-template-columns:1fr}.g4,.plans{grid-template-columns:repeat(2,1fr)}.g3,.steps{grid-template-columns:1fr 1fr}}
@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:44px 0 40px}.sec{padding:52px 0}.g2,.g3,.g4,.steps,.plans{grid-template-columns:1fr}.stat{flex:1 1 40%}.logo-t em{display:none}.tbl th,.tbl td{padding:10px 12px}.mock-row{flex-wrap:wrap}.btn-lg{width:100%}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}