:root{--ink:#11263d;--muted:#607386;--paper:#fbfdfb;--sea:#0c7c86;--blue:#3378f6;--mint:#dff5e9;--line:#dfe8e6;--cream:#f4f1e7;--shadow:0 18px 55px rgba(20,55,70,.1);--radius:22px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.65}a{color:inherit;text-decoration:none}img{max-width:100%}.container{width:min(1180px,calc(100% - 40px));margin:auto}.narrow{width:min(780px,calc(100% - 40px))}.site-header{height:76px;position:sticky;top:0;z-index:50;background:rgba(251,253,251,.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(223,232,230,.8)}.nav-wrap{height:100%;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:600;letter-spacing:-.5px}.brand b{color:var(--sea)}.brand-mark{position:relative;width:35px;height:30px;display:inline-block}.brand-mark 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@media(max-width:430px){.tools-grid{grid-template-columns:1fr}.category-grid{grid-template-columns:1fr}.hero h1{font-size:38px}.hero-search input{font-size:13px}.section-head>a{display:none}}