/* 51吃瓜 · sky-blue responsive design. No images generated. */
:root{--sky:#48BAF1;--sky-soft:#BFEAFF;--sky-pale:#E9F8FF;--navy:#14344F;--navy-deep:#102B42;--action-blue:#116A9B;--action-hover:#0D5278;--paper:#FAFCFE;--paper-white:#FFF;--fog:#F2F7FA;--border:#DBEAF2;--title:#173754;--body:#354A59;--muted:#416A80;--coral:#F08B82;--mint:#7BC7B4;--lavender:#AD9CDE;--apricot:#E2B36A}
*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--body);font:16px/1.78 system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}a{color:var(--action-blue);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid var(--coral);outline-offset:3px}img{max-width:100%;height:auto;object-fit:contain}button,input,textarea,select{font:inherit}button{cursor:pointer}.wrap{width:min(100% - 64px,1260px);margin:auto}.skip{position:absolute;top:-99px;left:12px;z-index:30;background:white;padding:10px}.skip:focus{top:8px}.site-header{background:#fff;border-bottom:1px solid var(--border);position:relative;z-index:12}.header-row{height:68px;display:flex;align-items:center;gap:30px}.brand{display:flex;gap:9px;align-items:center;white-space:nowrap;color:var(--navy)}.brand:hover{text-decoration:none}.brand b{display:block;font-size:24px;line-height:1.18}.brand small{display:block;font-size:9px;letter-spacing:1.5px;color:var(--muted)}.brand-logo{width:100px;max-height:45px}.brand-logo:not(:empty)+span{display:block}.main-nav{display:flex;gap:24px;margin-left:auto;white-space:nowrap}.main-nav a{font-size:15px;color:var(--navy);font-weight:650}.main-nav .current{color:var(--action-blue);border-bottom:2px solid var(--sky)}.header-tools{display:flex;align-items:center;gap:14px}.search-icon{font-size:26px}.menu-button{border:1px solid var(--border);background:var(--sky-pale);color:var(--navy);border-radius:9px;padding:8px 12px;white-space:nowrap}.category-rail{background:var(--sky-pale)}.category-scroll{height:42px;display:flex;gap:34px;align-items:center;overflow-x:auto;scrollbar-width:thin;white-space:nowrap}.category-scroll a{color:var(--navy);font-size:14px}.drawer{position:fixed;z-index:31;right:0;top:0;bottom:0;width:min(410px,88vw);overflow-y:auto;background:#fff;box-shadow:-12px 0 28px #12344f22;padding:22px;transform:translateX(110%);transition:transform .22s}.drawer.open{transform:translateX(0)}.drawer[aria-hidden=true]{visibility:hidden}.drawer-head{display:flex;align-items:center;justify-content:space-between}.drawer-head strong{font-size:22px;color:var(--navy)}.drawer-head button{background:#edf7fc;border:0;border-radius:8px;width:44px;height:44px}.drawer-search{margin-top:22px}.drawer-search label{display:block;font-size:13px}.searchline{display:flex;gap:6px}.searchline input{flex:1;min-width:0}.searchline input,.search-form input,select,textarea,input[type=password],input[type=text]{border:1px solid #9bb5c5;border-radius:8px;padding:10px 12px;background:#fff;color:var(--navy)}.searchline button,.button,.search-form button,button.primary{border:0;display:inline-block;background:var(--action-blue);color:white;border-radius:8px;padding:10px 18px;min-height:44px}.searchline button:hover,.button:hover{background:var(--action-hover);text-decoration:none}.drawer-section{padding:12px 0;border-bottom:1px solid var(--border)}.drawer-section h2{font-size:16px;color:var(--navy)}.drawer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.drawer-links a{font-size:14px}.menu-overlay{position:fixed;inset:0;background:#102b4277;z-index:30}.content{padding:30px 0 76px}.crumb{font-size:14px;color:var(--muted);margin-bottom:20px}.page-heading{padding:32px 36px;background:linear-gradient(125deg,var(--sky-pale),white);border:1px solid var(--border);border-radius:16px;margin-bottom:28px}.page-heading h1{font-size:34px;line-height:1.3;margin:7px 0;color:var(--title)}.page-heading p{margin:0;max-width:740px}.eyebrow{color:var(--action-blue);font-size:13px;font-weight:750;letter-spacing:.04em}.hero{margin:24px 0 32px;min-height:350px;display:grid;grid-template-columns:44% 56%;align-items:center;background:linear-gradient(120deg,#d4f2ff,#eef9ff 55%,#fff);border:1px solid var(--border);border-radius:18px;overflow:hidden}.hero-copy{padding:48px}.hero h1{font-size:39px;line-height:1.34;color:var(--navy);margin:10px 0 16px}.hero p{font-size:17px}.hero-media{display:flex;align-items:center;justify-content:center;min-height:300px;padding:20px;background:linear-gradient(140deg,#d1efff,#fbfdff)}.hero-media img{width:100%;max-height:350px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.button.secondary{background:white;color:var(--action-blue);border:1px solid #96cde6}.link-rail{display:flex;flex-wrap:wrap;gap:10px}.link-rail a{display:inline-block;border:1px solid var(--border);border-radius:20px;background:white;color:var(--navy);padding:7px 15px;font-size:14px}.home-layout{display:grid;grid-template-columns:170px minmax(0,1fr) 260px;gap:24px;align-items:start}.home-layout .side{background:white;border:1px solid var(--border);border-radius:12px;padding:15px}.home-layout .side h2{font-size:17px;color:var(--navy);margin:0 0 8px}.side a{display:block;padding:6px 0;font-size:14px}.home-layout .home-main{min-width:0}.section{margin:0 0 52px}.section-head{display:flex;justify-content:space-between;gap:16px;align-items:center;margin:0 0 20px}.section h2{margin:0;color:var(--title);font-size:26px;line-height:1.35}.section-head a{white-space:nowrap;font-size:14px}.section-intro{color:var(--muted);margin:0 0 18px}.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.card-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.article-card{background:white;border:1px solid var(--border);border-radius:13px;padding:22px;min-width:0;box-shadow:0 5px 20px #14344f07}.article-card h3{font-size:18px;line-height:1.5;margin:7px 0;color:var(--title)}.article-card h3 a{color:var(--title)}.article-card p{font-size:14px;line-height:1.7;margin:8px 0 14px}.tag{font-size:12px;color:var(--muted)}.media-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-bottom:15px}.media-row img{background:var(--fog);border-radius:12px;aspect-ratio:16/9;width:100%;object-fit:contain}.media-row:empty{display:none}.feature-slab{background:linear-gradient(100deg,#e9f8ff,#fff);padding:24px;border:1px solid var(--border);border-radius:16px}.feature-slab:nth-of-type(4n){background:linear-gradient(100deg,#f4f1ff,#fff)}.feature-slab:nth-of-type(5n){background:linear-gradient(100deg,#e7f8f3,#fff)}.feature-slab .card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.numberless-list{list-style:none;padding:0;margin:0}.numberless-list li{border-bottom:1px solid var(--border);padding:10px 0}.numberless-list a{font-weight:650}.pages{display:flex;gap:14px;align-items:center;justify-content:center;margin:28px 0}.pages a{padding:7px 14px;border:1px solid var(--border);border-radius:8px}.reading{max-width:780px;margin:0 auto}.reading h1{font-size:36px;line-height:1.38;color:var(--title)}.reading .lead{font-size:19px;color:var(--muted)}.reading p{margin:17px 0;line-height:1.85}.reading h2{color:var(--navy);font-size:24px;margin-top:32px}.note{padding:14px 18px;border-left:4px solid var(--mint);background:var(--fog);border-radius:7px}.muted{color:var(--muted)}.search-form{display:flex;gap:10px;max-width:750px}.search-form input{flex:1;min-width:0}.forum-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.forum-category{display:block;background:white;padding:20px;border:1px solid var(--border);border-radius:12px}.forum-category h2{font-size:19px;margin:0;color:var(--navy)}.forum-category p{font-size:14px;color:var(--muted);margin:7px 0 0}.forum-item{background:white;padding:20px;border:1px solid var(--border);border-radius:12px;margin:12px 0}.forum-item h3{margin:0 0 8px;font-size:18px}.forum-form{max-width:760px;background:white;border:1px solid var(--border);border-radius:12px;padding:24px}.field{display:flex;flex-direction:column;margin:0 0 16px;gap:5px}.field input,.field textarea,.field select{width:100%}.field textarea{min-height:160px;resize:vertical}.error{background:#fff0ee;border:1px solid #eab7ae;color:#7f2c22;padding:12px;border-radius:8px}.success{background:#e9f8f2;border:1px solid #a1d0bc;color:#245a47;padding:12px;border-radius:8px}.site-footer{background:var(--navy-deep);color:#f9fcff;padding:44px 0 26px}.footer-grid{display:grid;grid-template-columns:2fr repeat(5,1fr);gap:25px}.footer-grid h2{font-size:23px;margin:0}.footer-grid h2 span{font-size:12px}.footer-grid h3{font-size:15px;margin:0 0 12px}.footer-grid p{font-size:14px;line-height:1.8;color:#dbedf4}.footer-grid a{display:block;color:#e4f7ff;font-size:13px;margin:8px 0}.footer-bottom{display:flex;justify-content:space-between;gap:18px;border-top:1px solid #39708a;margin-top:30px;padding-top:20px;font-size:12px}.footer-bottom a{color:#e4f7ff}.mobile-tabs{display:none}
@media(max-width:1199px){.home-layout{grid-template-columns:minmax(0,1fr)}.home-layout .side:first-child{display:flex;flex-wrap:wrap;gap:5px 18px}.side h2{width:100%}.home-layout .side a{display:inline-block}.main-nav{gap:12px}.main-nav a{font-size:13px}.footer-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:880px){.main-nav{display:none}.header-tools{margin-left:auto}.hero{grid-template-columns:1fr}.hero-copy{padding:34px}.hero-media{min-height:220px}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.card-grid.three{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.wrap{width:calc(100% - 34px)}.content{padding:22px 0 94px}.brand b{font-size:21px}.brand-logo{max-width:64px}.header-tools{gap:7px}.menu-button{font-size:12px;padding:8px}.category-scroll{gap:22px}.hero{margin-top:15px}.hero-copy{padding:26px}.hero h1{font-size:29px}.hero p{font-size:16px}.hero-media{min-height:170px}.page-heading{padding:22px}.page-heading h1{font-size:27px}.section{margin-bottom:34px}.section h2{font-size:22px}.card-grid,.card-grid.three,.feature-slab .card-grid,.forum-grid{grid-template-columns:1fr}.article-card{padding:18px}.feature-slab{padding:16px}.media-row{grid-template-columns:1fr}.reading h1{font-size:29px}.search-form{flex-direction:column}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.footer-grid>div:first-child{grid-column:1/-1}.footer-bottom{flex-direction:column}.mobile-tabs{position:fixed;bottom:0;left:0;right:0;background:white;box-shadow:0 -4px 15px #102b4222;display:flex;justify-content:space-around;padding:6px 5px max(6px,env(safe-area-inset-bottom));z-index:13}.mobile-tabs a{text-align:center;color:var(--navy);font-size:22px;line-height:1.1;min-width:56px;min-height:44px}.mobile-tabs span{display:block;font-size:11px}.site-footer{padding-bottom:105px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.drawer{transition:none}}