:root{
  --ink:#102a2b;--muted:#627170;--paper:#f7f3e9;--white:#fffdf8;
  --mint:#98e2c6;--mint-dark:#167a62;--rose:#ff8c87;--yellow:#f2c94c;
  --line:#173f40;--shadow:8px 8px 0 rgba(16,42,43,.14);--radius:8px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:
linear-gradient(rgba(16,42,43,.035) 1px,transparent 1px),
linear-gradient(90deg,rgba(16,42,43,.035) 1px,transparent 1px),var(--paper);
background-size:28px 28px;font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input{font:inherit}
.site-header{position:sticky;top:0;z-index:30;background:rgba(247,243,233,.96);border-bottom:2px solid var(--line);backdrop-filter:blur(8px)}
.topline{background:var(--ink);color:#fff;display:flex;justify-content:space-between;padding:5px max(20px,calc((100vw - 1180px)/2));font-size:12px;letter-spacing:.08em}
.nav-wrap{max-width:1180px;margin:auto;display:flex;align-items:center;gap:24px;padding:14px 20px}
.brand{display:flex;align-items:center;gap:10px;min-width:190px}
.brand strong{display:block;font-size:19px;letter-spacing:.03em}
.brand small{display:block;color:var(--muted);font-size:10px;text-transform:uppercase;letter-spacing:.16em}
.brand-mark{width:42px;height:42px;border:2px solid var(--line);background:var(--mint);display:grid;place-items:center;font-weight:900;box-shadow:4px 4px 0 var(--line)}
.main-nav{display:flex;gap:16px;align-items:center;flex:1;justify-content:center}
.main-nav a{font-size:14px;font-weight:700;border-bottom:2px solid transparent}
.main-nav a:hover{border-color:var(--rose)}
.search-btn,.menu-btn{border:2px solid var(--line);background:var(--yellow);padding:8px 14px;font-weight:800;cursor:pointer;box-shadow:3px 3px 0 var(--line)}
.menu-btn{display:none}
main{min-height:65vh}
.hero{max-width:1180px;margin:42px auto 28px;padding:0 20px;display:grid;grid-template-columns:1.08fr .92fr;gap:28px;align-items:stretch}
.hero-copy{border:2px solid var(--line);background:var(--white);padding:44px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.hero-copy:before{content:"COMPARE";position:absolute;right:-18px;top:2px;font-size:72px;font-weight:900;color:rgba(22,122,98,.08);transform:rotate(90deg)}
.eyebrow{display:inline-flex;gap:8px;align-items:center;background:var(--mint);border:2px solid var(--line);padding:4px 10px;font-weight:900;font-size:13px}
h1{font-size:clamp(34px,5vw,66px);line-height:1.05;margin:22px 0 18px;letter-spacing:-.04em}
.hero p{font-size:18px;max-width:680px;color:#365354}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.btn{display:inline-block;border:2px solid var(--line);padding:11px 18px;font-weight:900;background:var(--rose);box-shadow:4px 4px 0 var(--line)}
.btn.alt{background:var(--white)}
.hero-board{border:2px solid var(--line);background:var(--ink);color:#fff;padding:26px;box-shadow:var(--shadow);display:grid;gap:14px}
.board-title{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #668282;padding-bottom:10px}
.board-row{display:grid;grid-template-columns:1fr 60px 1fr;align-items:center;gap:10px}
.board-side{border:1px solid #86a4a4;padding:14px;background:#173b3c}
.board-vs{width:52px;height:52px;border-radius:50%;background:var(--yellow);color:var(--ink);display:grid;place-items:center;font-weight:900;border:2px solid #fff}
.board-meter{height:8px;background:#35595a;position:relative}
.board-meter span{display:block;height:100%;background:var(--mint)}
.section{max-width:1180px;margin:55px auto;padding:0 20px}
.section-head{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:22px}
.section-head h2{font-size:34px;margin:0;line-height:1.15}
.section-head p{margin:0;color:var(--muted);max-width:520px}
.category-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.category-card{border:2px solid var(--line);background:var(--white);padding:22px;min-height:220px;box-shadow:5px 5px 0 rgba(16,42,43,.12);position:relative;overflow:hidden}
.category-card:nth-child(2n){background:#f5e5df}
.category-card:nth-child(3n){background:#e2f5ec}
.category-card .num{font-size:54px;font-weight:900;color:rgba(16,42,43,.12);position:absolute;right:12px;top:0}
.category-card h3{font-size:23px;margin:42px 0 8px}
.category-card p{color:#4f6565;font-size:14px}
.category-card b{font-size:13px;background:var(--yellow);padding:2px 6px}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.topic-card{border:2px solid var(--line);background:var(--white);padding:24px;display:flex;flex-direction:column;min-height:240px;transition:.15s;box-shadow:5px 5px 0 rgba(16,42,43,.1)}
.topic-card:hover{transform:translate(-2px,-2px);box-shadow:8px 8px 0 rgba(16,42,43,.16)}
.card-kicker{font-size:12px;font-weight:900;color:var(--mint-dark);text-transform:uppercase;letter-spacing:.08em}
.topic-card h3{font-size:21px;line-height:1.35;margin:12px 0}
.topic-card p{font-size:14px;color:var(--muted);flex:1}
.card-arrow{font-weight:900;color:var(--mint-dark);margin-top:12px}
.workflow{display:grid;grid-template-columns:repeat(4,1fr);border:2px solid var(--line)}
.step{padding:24px;background:var(--white);border-right:2px solid var(--line)}
.step:last-child{border-right:0}
.step span{display:inline-grid;place-items:center;width:34px;height:34px;background:var(--rose);border:2px solid var(--line);font-weight:900}
.step h3{margin:14px 0 4px}
.page-hero{max-width:1180px;margin:30px auto 0;padding:0 20px}
.page-hero-inner{display:grid;grid-template-columns:1.1fr .9fr;border:2px solid var(--line);background:var(--white);box-shadow:var(--shadow);overflow:hidden}
.page-hero-copy{padding:40px}
.page-hero-copy h1{font-size:clamp(32px,4vw,52px)}
.page-hero-copy p{font-size:17px;color:var(--muted)}
.page-hero-image{min-height:330px;background-size:cover;background-position:center;position:relative}
.page-hero-image:after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(152,226,198,.2),rgba(255,140,135,.28))}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:16px}
.breadcrumb b{margin:0 8px;color:var(--rose)}
.article-layout{max-width:1180px;margin:30px auto 60px;padding:0 20px;display:grid;grid-template-columns:minmax(0,780px) 1fr;gap:28px}
.article{border:2px solid var(--line);background:var(--white);padding:36px;box-shadow:5px 5px 0 rgba(16,42,43,.1)}
.article h2{font-size:28px;line-height:1.25;margin:36px 0 14px;border-left:8px solid var(--mint);padding-left:12px}
.article h3{font-size:20px}
.lead{font-size:18px;color:#324f50;border-bottom:2px dashed #afbbb7;padding-bottom:24px}
.compare-table{width:100%;border-collapse:collapse;margin:18px 0}
.compare-table th,.compare-table td{border:1px solid var(--line);padding:12px;text-align:left;vertical-align:top}
.compare-table th{background:var(--mint);width:28%}
.check-list,.pitfall-list{padding:0;list-style:none;display:grid;gap:10px}
.check-list li,.pitfall-list li{border:1px solid #8ea4a3;padding:11px 12px;background:#f8fcfa}
.check-list li:before{content:"✓";display:inline-grid;place-items:center;width:23px;height:23px;background:var(--mint);border:1px solid var(--line);margin-right:9px;font-weight:900}
.pitfall-list li:before{content:"!";display:inline-grid;place-items:center;width:23px;height:23px;background:var(--rose);border:1px solid var(--line);margin-right:9px;font-weight:900}
.note{border:2px solid var(--line);background:#fff4bf;padding:18px;margin:22px 0}
.sidebar{display:grid;align-content:start;gap:18px}
.side-box{border:2px solid var(--line);background:var(--white);padding:20px;box-shadow:4px 4px 0 rgba(16,42,43,.1)}
.side-box h3{margin-top:0}
.side-box a{display:block;padding:9px 0;border-bottom:1px dashed #9aaaa7;font-size:14px;font-weight:700}
.meta{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0 20px}
.meta span{background:#e2f5ec;border:1px solid var(--line);padding:4px 8px;font-size:12px}
.faq{display:grid;gap:10px}
.faq details{border:2px solid var(--line);background:var(--white);padding:14px 16px}
.faq summary{font-weight:900;cursor:pointer}
.calculator{border:3px solid var(--line);background:#e2f5ec;padding:24px;margin:26px 0;box-shadow:6px 6px 0 var(--line)}
.calculator h2{border:0;padding:0;margin-top:0}
.tool-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.tool-grid.five{grid-template-columns:repeat(5,1fr)}
.tool-grid label{font-size:13px;font-weight:800}
.tool-grid input{width:100%;border:2px solid var(--line);background:#fff;padding:9px;margin-top:4px}
.calculator button{border:2px solid var(--line);background:var(--rose);padding:10px 16px;font-weight:900;margin-top:16px;cursor:pointer;box-shadow:3px 3px 0 var(--line)}
.tool-result{margin-top:16px;border:2px dashed var(--line);background:#fff;padding:16px;font-weight:800;white-space:pre-line}
.site-footer{background:var(--ink);color:#fff;padding:48px 20px 18px;border-top:6px solid var(--mint)}
.footer-grid{max-width:1180px;margin:auto;display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:28px}
.brand-footer .brand-mark{color:var(--ink)}
.site-footer p{color:#bdd0cd;font-size:14px}
.site-footer a{display:block;color:#eaf6f1;font-size:14px;padding:3px 0}
.site-footer h3{margin-top:0;color:var(--mint)}
.chat-link{display:inline-block!important;background:var(--rose);color:var(--ink)!important;border:2px solid #fff;padding:8px 12px!important;font-weight:900}
.copyright{max-width:1180px;margin:35px auto 0;border-top:1px solid #416263;padding-top:14px;color:#93aeaa;font-size:12px}
.floating-chat{position:fixed;right:20px;bottom:20px;background:var(--rose);border:2px solid var(--line);padding:12px 16px;font-weight:900;box-shadow:4px 4px 0 var(--line);z-index:20}
.search-panel{position:fixed;inset:0;background:rgba(16,42,43,.84);z-index:100;padding:8vh 20px}
.search-box{max-width:760px;margin:auto;background:var(--paper);border:3px solid var(--line);padding:26px;box-shadow:10px 10px 0 var(--mint)}
.search-box label{display:block;font-size:24px;font-weight:900}
.search-box input{width:100%;border:2px solid var(--line);padding:14px;margin:12px 0;background:#fff}
.search-close{float:right;border:2px solid var(--line);background:var(--rose);font-weight:900}
.search-item{display:block;border-bottom:1px dashed #79908f;padding:10px}
.search-item b{display:block}
@media(max-width:980px){
 .main-nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--paper);border-bottom:2px solid var(--line);padding:16px;flex-wrap:wrap}
 .main-nav.open{display:flex}.menu-btn{display:block;margin-left:auto}.search-btn{margin-left:0}
 .hero,.page-hero-inner,.article-layout{grid-template-columns:1fr}.category-grid{grid-template-columns:repeat(2,1fr)}
 .card-grid{grid-template-columns:repeat(2,1fr)}.workflow{grid-template-columns:repeat(2,1fr)}.step{border-bottom:2px solid var(--line)}
 .footer-grid{grid-template-columns:repeat(2,1fr)}.page-hero-image{min-height:240px}
 .tool-grid.five{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
 .topline span:last-child{display:none}.nav-wrap{gap:10px}.brand{min-width:0}.brand strong{font-size:16px}.brand small{display:none}
 .hero{margin-top:20px}.hero-copy{padding:26px}.hero-copy:before{display:none}.hero-board{padding:18px}
 .category-grid,.card-grid,.workflow,.footer-grid,.tool-grid{grid-template-columns:1fr}
 .step{border-right:0}.section{margin-top:42px}.section-head{align-items:start;flex-direction:column}.section-head h2{font-size:28px}
 .page-hero-copy,.article{padding:24px}.article h2{font-size:24px}.floating-chat{right:10px;bottom:10px}
}