:root{
  --blue:#165DFF; --blue-600:#0E42B3; --blue-50:#E8F3FF; --blue-100:#BEE1FF;
  --text-1:#1D2129; --text-2:#4E5969; --text-3:#86909C;
  --border:#E5E6EB; --bg:#F7F8FA; --red:#F53F3F; --green:#00B42A;
  --amber:#854F0B; --amber-bg:#FFF7E8; --amber-bd:#FFE4BA;
  --radius:12px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"SF Pro Display","PingFang SC","Microsoft YaHei",-apple-system,sans-serif;
  background:#fff;color:var(--text-1);line-height:1.6;-webkit-font-smoothing:antialiased;
}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
.wrap.narrow{max-width:720px}
a{color:inherit;text-decoration:none}
img{max-width:100%}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.nav-in{max-width:1080px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:9px;font-size:15px;font-weight:500;white-space:nowrap}
.brand b{font-weight:600;color:var(--blue)}
.logo{width:26px;height:26px;border-radius:7px;background:var(--blue);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;flex:none}
.nav-links{display:flex;gap:22px;margin-left:auto;font-size:14px;color:var(--text-2)}
.nav-links a:hover{color:var(--blue)}
@media(max-width:760px){.nav-links{display:none}}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border:none;border-radius:9px;font-size:14px;font-weight:500;font-family:inherit;
  background:var(--blue);color:#fff;cursor:pointer;transition:background .15s,opacity .15s;white-space:nowrap}
.btn:hover{background:var(--blue-600)}
.btn:active{opacity:.82}
.btn-ghost{background:#fff;color:var(--text-2);border:1px solid var(--border)}
.btn-ghost:hover{background:var(--bg);color:var(--text-1)}
.btn-sm{padding:8px 15px;font-size:13px}
.btn-lg{padding:14px 28px;font-size:15px}
.btn-full{width:100%;display:flex}

/* ---------- hero ---------- */
.hero{padding:76px 0 68px;background:
  radial-gradient(1000px 380px at 50% -80px,#E8F3FF 0%,rgba(232,243,255,0) 70%),#fff}
.hero-badge{display:inline-block;font-size:12.5px;color:var(--blue);background:var(--blue-50);
  border:1px solid var(--blue-100);border-radius:20px;padding:5px 13px;margin-bottom:26px}
.hero h1{font-size:44px;line-height:1.28;font-weight:600;letter-spacing:-.6px;max-width:760px}
.hl{color:var(--red);position:relative;white-space:nowrap}
.hl::after{content:'';position:absolute;left:0;right:0;bottom:4px;height:8px;background:rgba(245,63,63,.14);border-radius:3px;z-index:-1}
.hero-sub{margin-top:20px;font-size:16px;color:var(--text-2);line-height:1.85;max-width:680px}
.hero-sub b{color:var(--text-1);font-weight:500}
.hero-cta{margin-top:32px;display:flex;gap:12px;flex-wrap:wrap}
.hero-note{margin-top:16px;font-size:13px;color:var(--text-3)}
@media(max-width:760px){.hero{padding:52px 0 44px}.hero h1{font-size:29px}.hero-sub{font-size:15px}.hero-cta .btn{flex:1}}

/* ---------- sections ---------- */
.sec{padding:72px 0}
.sec-alt{background:var(--bg);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.sec-head{text-align:center;margin-bottom:40px}
.sec-head h2{font-size:30px;font-weight:600;letter-spacing:-.3px}
.sec-head p{margin-top:10px;font-size:15px;color:var(--text-2)}
@media(max-width:760px){.sec{padding:48px 0}.sec-head h2{font-size:23px}.sec-head p{font-size:14px}}

/* ---------- card ---------- */
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin-bottom:16px;
  box-shadow:0 1px 3px rgba(0,0,0,.04)}
.card-h{font-size:15px;font-weight:600;margin-bottom:7px}
.card-p{font-size:13.5px;color:var(--text-2);margin-bottom:14px;line-height:1.75}

/* ---------- form ---------- */
.grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field{display:flex;flex-direction:column}
.field.full{grid-column:1/-1}
label{font-size:12.5px;color:var(--text-2);margin-bottom:6px}
.input-box{position:relative}
input[type=number],input[type=text]{
  width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:9px;
  font-size:15px;font-family:inherit;color:var(--text-1);background:#fff;transition:border-color .15s,box-shadow .15s;
  -moz-appearance:textfield}
input[type=number]::-webkit-outer-spin-button,input[type=number]::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
input[type=number]:focus,input[type=text]:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(22,93,255,.1)}
.suffix{position:absolute;right:12px;top:50%;transform:translateY(-50%);font-size:13px;color:var(--text-3);pointer-events:none}
.hint{font-size:11.5px;color:var(--text-3);margin-top:6px;line-height:1.6}
@media(max-width:520px){.grid{grid-template-columns:1fr}}

/* ---------- result ---------- */
.result{background:var(--bg);border-radius:10px;padding:2px 15px}
.r-row{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid #EFF0F3}
.r-row:last-child{border-bottom:none}
.r-row .k{font-size:13.5px;color:var(--text-2)}
.r-row .v{font-size:15px;font-weight:600}
.r-row .v.red{color:var(--red)}
.r-row.highlight{background:var(--blue-50);margin:0 -15px;padding:15px}
.r-row.highlight .k{font-size:13.5px;color:var(--text-2)}
.r-row.highlight .v{font-size:27px;font-weight:600;color:var(--blue);letter-spacing:-.5px}
.tip{margin-top:14px;padding:12px 14px;border-radius:9px;font-size:13px;line-height:1.7;
  background:var(--amber-bg);color:var(--amber);border:1px solid var(--amber-bd)}
.tip b{font-weight:600}
.tip.err{background:#FFECE8;color:#A8071A;border-color:#FFCCC7}

/* ---------- share ---------- */
.rowbtns{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.share-box{margin-top:13px;background:var(--bg);border:1px dashed var(--border);border-radius:9px;
  padding:13px;font-size:13px;color:var(--text-2);line-height:1.75;white-space:pre-wrap;word-break:break-all}

/* ---------- compare ---------- */
.cmp{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:760px){.cmp{grid-template-columns:1fr}}
.cmp-col{border:1px solid var(--border);border-radius:var(--radius);padding:24px;background:#fff}
.cmp-bad{background:#FAFAFA}
.cmp-good{border-color:var(--blue-100);background:linear-gradient(180deg,#F5F9FF 0%,#fff 42%)}
.cmp-tag{font-size:12px;padding:3px 10px;border-radius:20px;display:inline-block;margin-bottom:12px}
.cmp-bad .cmp-tag{background:#F1EFE8;color:var(--text-2)}
.cmp-good .cmp-tag{background:var(--blue);color:#fff}
.cmp-col h3{font-size:18px;font-weight:600;margin-bottom:14px}
.cmp-line{background:#fff;border:1px solid var(--border);border-radius:8px;padding:11px 13px;margin-bottom:16px;
  font-size:12.5px;color:var(--text-1);overflow-x:auto}
.cmp-line code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;line-height:1.6}
.cmp-col ul{list-style:none;margin-bottom:18px}
.cmp-col li{position:relative;padding-left:22px;font-size:13.5px;color:var(--text-2);line-height:1.85}
.cmp-col li::before{position:absolute;left:0;top:0;font-weight:600}
.cmp-bad li::before{content:'×';color:var(--red)}
.cmp-good li::before{content:'✓';color:var(--green)}
.cmp-result{font-size:14px;color:var(--text-2);padding-top:15px;border-top:1px solid var(--border)}
.cmp-result b{font-size:22px;color:var(--text-1);font-weight:600;margin:0 3px}
.muted{color:var(--text-3);font-size:12.5px}
.gap-note{margin-top:26px;background:var(--amber-bg);border:1px solid var(--amber-bd);border-radius:var(--radius);padding:20px 22px}
.gap-note b{font-size:14.5px;color:var(--amber);display:block;margin-bottom:8px}
.gap-note p{font-size:14px;color:#7A4B08;line-height:1.85}
.gap-note p b{color:#7A2E06}

/* ---------- features ---------- */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:860px){.feat-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.feat-grid{grid-template-columns:1fr}}
.feat{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px}
.feat-n{font-size:12px;font-weight:600;color:var(--blue);letter-spacing:1px;margin-bottom:10px}
.feat h3{font-size:15.5px;font-weight:600;margin-bottom:9px}
.feat p{font-size:13.5px;color:var(--text-2);line-height:1.8}
.local-note{margin-top:24px;background:#fff;border:1px solid var(--border);border-left:3px solid var(--green);
  border-radius:var(--radius);padding:20px 22px}
.local-note b{font-size:14.5px;display:block;margin-bottom:8px}
.local-note p{font-size:13.5px;color:var(--text-2);line-height:1.85}

/* ---------- price ---------- */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:start}
@media(max-width:860px){.price-grid{grid-template-columns:1fr;max-width:420px;margin:0 auto}}
.price{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:26px;position:relative}
.price-hot{border-color:var(--blue);box-shadow:0 6px 22px rgba(22,93,255,.1)}
.price-flag{position:absolute;top:-11px;left:26px;background:var(--blue);color:#fff;font-size:11.5px;
  padding:3px 11px;border-radius:20px}
.price-name{font-size:14px;color:var(--text-2);margin-bottom:10px}
.price-val{font-size:34px;font-weight:600;letter-spacing:-1px;margin-bottom:20px}
.price-val span{font-size:14px;font-weight:400;color:var(--text-3);margin-left:4px}
.price ul{list-style:none;margin-bottom:22px}
.price li{position:relative;padding-left:19px;font-size:13.5px;color:var(--text-2);line-height:2}
.price li::before{content:'✓';position:absolute;left:0;color:var(--green);font-weight:600}
.price-note{text-align:center;margin-top:26px;font-size:14px;color:var(--text-2)}
.price-note b{color:var(--text-1);font-weight:500}

/* ---------- download ---------- */
.dl-msg{margin-top:14px;font-size:13.5px;line-height:1.75;display:none}
.dl-msg.show{display:block}
.dl-ok{background:#F0FAF3;border:1px solid #B7E5C6;border-radius:9px;padding:14px;color:#1E6F3C}
.dl-err{background:#FFECE8;border:1px solid #FFCCC7;border-radius:9px;padding:14px;color:#A8071A}
.dl-ok code,.dl-err code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:rgba(0,0,0,.05);
  padding:2px 7px;border-radius:5px;font-size:13px;word-break:break-all;display:inline-block;margin-top:5px}
.dl-label{font-size:12px;color:var(--text-3);display:block;margin-top:9px}
.dl-tips ol{padding-left:20px}
.dl-tips li{font-size:13.5px;color:var(--text-2);line-height:2}

/* ---------- faq ---------- */
.faq{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#fff}
.faq details{border-bottom:1px solid var(--border)}
.faq details:last-child{border-bottom:none}
.faq summary{padding:16px 20px;font-size:14.5px;font-weight:500;cursor:pointer;list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';position:absolute;right:20px;top:50%;transform:translateY(-50%);color:var(--text-3);font-size:19px;font-weight:300}
.faq details[open] summary::after{content:'−'}
.faq details[open] summary{color:var(--blue)}
.faq details p{padding:0 20px 18px;font-size:13.5px;color:var(--text-2);line-height:1.9}
.faq details p b{color:var(--text-1);font-weight:500}

/* ---------- footer ---------- */
.foot{background:var(--bg);border-top:1px solid var(--border);padding:36px 0 26px}
.foot-in{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;flex-wrap:wrap}
.foot-p{font-size:12.5px;color:var(--text-3);margin-top:9px}
.foot-links{display:flex;gap:22px;font-size:13.5px;color:var(--text-2)}
.foot-links a:hover{color:var(--blue)}
.foot-note{margin-top:24px;padding-top:18px;border-top:1px solid var(--border);font-size:12px;color:var(--text-3);line-height:1.8}