:root{--brand1:#1677ff;--brand2:#0958d9;--grad:linear-gradient(120deg,#1677ff 0%,#0958d9 100%);--grad-soft:#e6f0ff;--blue:#1677ff;--blue-dark:#0958d9;--blue-soft:#e6f0ff;--ink:#0f172a;--text:#334155;--muted:#94a3b8;--line:#e2e8f0;--bg:#f8fafc;--surface:#ffffff;--price:#f97316;--nav-h:62px;--shadow:0 10px 30px rgba(15,23,42,.08);--radius:14px}
*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}a{text-decoration:none;color:inherit}ul{list-style:none}header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}.nav{height:var(--nav-h);display:flex;align-items:center;padding:0 32px;gap:28px}.logo{display:flex;align-items:center;gap:9px;font-size:22px;font-weight:800;color:var(--ink);white-space:nowrap;letter-spacing:.5px}.logo .cloud{font-size:26px;color:var(--blue)}.nav-menu{display:flex;align-items:center;gap:26px;font-size:15px}.nav-menu a{position:relative;padding:18px 0;color:#475569;display:flex;align-items:center;gap:5px;transition:color .2s}.nav-menu a:hover{color:var(--brand1)}.nav-menu a.active{color:var(--brand1);font-weight:600}.nav-menu a.open{color:var(--brand1);font-weight:600}.nav-menu a.active::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--grad);border-radius:2px 2px 0 0}.nav-menu a .arr{font-size:10px;color:var(--muted);margin-left:-2px;transition:transform .2s}.nav-menu a.open .arr,.nav-menu a:hover .arr{color:var(--brand1)}.nav-menu a.open .arr{transform:rotate(180deg)}.hot{background:var(--price);color:#fff;font-size:10px;padding:1px 5px;border-radius:4px;font-weight:700;line-height:1.4}.rec{background:#06b6d4;color:#fff;font-size:10px;padding:1px 5px;border-radius:4px;font-weight:700;line-height:1.4}.nav-right{margin-left:auto;display:flex;align-items:center;gap:16px;font-size:14px;color:#475569}.nav-right a:hover{color:var(--brand1)}.nav-search{display:flex;align-items:center;border:1px solid var(--line);border-radius:10px;padding:7px 12px;color:var(--muted);font-size:13px;background:#f8fafc;transition:border-color .2s}.nav-search:focus-within{border-color:var(--brand1)}.nav-search input{border:none;background:transparent;outline:none;width:120px;font-size:13px}.btn-reg{background:var(--grad);color:#fff;padding:8px 18px;border-radius:8px;font-weight:700;font-size:14px;transition:transform .2s,box-shadow .2s}.btn-reg:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(22,119,255,.28)}

.mega-wrap{position:absolute;top:var(--nav-h);left:0;right:0;z-index:60;display:none}.mega-wrap.open{display:block}.mega-backdrop{position:fixed;inset:var(--nav-h) 0 0 0;background:rgba(15,23,42,.18);z-index:-1}.mega-panel{display:flex;background:rgba(255,255,255,.96);backdrop-filter:blur(16px);box-shadow:var(--shadow);border-top:1px solid var(--line);min-height:430px;overflow:hidden}.mega-left{width:248px;background:var(--grad-soft);padding:24px 0;flex-shrink:0}.mega-left h2{font-size:20px;font-weight:800;color:var(--ink);padding:0 24px 14px;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.mega-nav li{font-size:14px}.mega-nav a{display:flex;align-items:center;justify-content:space-between;padding:11px 24px;color:#475569;transition:background .15s,color .15s}.mega-nav a:hover{background:#e0e7ff;color:var(--brand1)}.mega-nav a.active{background:var(--brand1);color:#fff;font-weight:600}.mega-nav a .hot{background:#fff;color:var(--brand1);font-size:10px;padding:1px 5px;border-radius:3px;font-weight:700}.mega-nav a.active .hot{background:rgba(255,255,255,.25);color:#fff}.mega-right{flex:1;padding:22px 26px;position:relative}.mega-close{position:absolute;top:14px;right:18px;width:26px;height:26px;border-radius:50%;background:#f1f5f9;color:#64748b;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:14px}.mega-search{display:flex;align-items:center;gap:8px;background:#f1f5f9;border-radius:8px;padding:8px 12px;margin-bottom:14px}.mega-search input{border:none;background:transparent;outline:none;flex:1;font-size:13px}.mega-tags{display:flex;gap:8px;margin-bottom:14px}.mega-tag{padding:5px 12px;border-radius:14px;background:#f1f5f9;color:#475569;font-size:13px;cursor:pointer}.mega-tag.active{background:var(--grad);color:#fff}.mega-body{display:flex;gap:26px}.mega-col{flex:1}.mega-col-title{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:12px;display:flex;align-items:center;justify-content:space-between}.mega-col-title .more{font-size:13px;color:var(--muted);font-weight:400}.mega-simple-item{padding:14px;border-radius:10px;transition:background .15s;cursor:pointer;box-sizing:border-box;min-height:80px}.mega-simple-item:hover{background:#f8fafc}.mega-simple-item h4{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:6px;display:flex;align-items:center;gap:6px}.mega-simple-item h4 .badge{font-size:10px;padding:1px 6px;border-radius:3px;background:var(--price);color:#fff}.mega-simple-item p{font-size:13px;color:#64748b;line-height:1.55}.mega-nav li a{display:flex;align-items:center;justify-content:space-between;box-sizing:border-box}.rec-list{display:flex;flex-direction:column;gap:12px}.rec-item{display:flex;gap:14px;padding:10px;border-radius:10px;transition:background .15s;cursor:pointer;align-items:flex-start}.rec-item:hover{background:#f8fafc}.rec-num{width:36px;height:36px;border-radius:8px;background:var(--blue-soft);color:var(--brand1);display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;flex-shrink:0}.rec-text h4{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:4px}.rec-text p{font-size:12px;color:#64748b;line-height:1.55}.news-list{display:flex;flex-direction:column;gap:12px}.news-item{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid #f1f5f9;font-size:13px;color:#475569}.news-item:last-child{border-bottom:none}.news-item:hover{color:var(--brand1);cursor:pointer}.news-item .date{color:#94a3b8;font-size:12px}

/* ===== 百站赞助公益计划页面样式 ===== */
.sponsor-hero{position:relative;background:linear-gradient(135deg,#f0f7ff 0%,#ffffff 55%,#f5f9ff 100%);padding:78px 0 90px;overflow:hidden}
.sponsor-hero::before{content:"";position:absolute;right:-8%;top:-18%;width:680px;height:680px;border-radius:50%;background:radial-gradient(circle,rgba(22,119,255,.10) 0%,transparent 70%);pointer-events:none}
.sponsor-hero::after{content:"";position:absolute;left:4%;bottom:-26%;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle,rgba(6,182,212,.08) 0%,transparent 70%);pointer-events:none}
.sponsor-hero-inner{max-width:1180px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.1fr .9fr;gap:50px;align-items:center;position:relative;z-index:1}
.sponsor-hero h1{font-size:44px;font-weight:900;color:var(--ink);line-height:1.15;letter-spacing:-.5px}
.sponsor-hero h1 span{color:var(--brand1)}
.sponsor-hero .lead{font-size:17px;color:#475569;margin:22px 0 30px;max-width:520px;line-height:1.75}
.sponsor-hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn-prime{background:var(--grad);color:#fff;padding:13px 28px;border-radius:12px;font-size:15px;font-weight:700;box-shadow:0 10px 24px rgba(22,119,255,.28);transition:transform .2s,box-shadow .2s;display:inline-flex;align-items:center;gap:6px}.btn-prime:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(22,119,255,.35)}
.btn-second{background:#fff;color:var(--brand1);border:1.5px solid var(--brand1);padding:13px 28px;border-radius:12px;font-size:15px;font-weight:700;transition:all .2s;display:inline-flex;align-items:center;gap:6px}.btn-second:hover{background:var(--blue-soft)}
.sponsor-hero-visual{position:relative;height:360px;display:flex;align-items:center;justify-content:center}
.hero-isometric{position:relative;width:280px;height:240px}
.iso-box{position:absolute;background:linear-gradient(135deg,#fff 0%,#e6f0ff 100%);border-radius:16px;box-shadow:0 20px 60px rgba(22,119,255,.18);display:flex;align-items:center;justify-content:center}
.iso-box.main{width:160px;height:160px;left:60px;top:40px;z-index:2}
.iso-box.side1{width:90px;height:90px;left:0;top:20px;z-index:1;animation:float1 5s ease-in-out infinite}
.iso-box.side2{width:80px;height:80px;right:0;bottom:30px;z-index:1;animation:float2 6s ease-in-out infinite}
.iso-box .ym-ic{width:64px;height:64px;color:var(--brand1)}
@keyframes float1{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
@keyframes float2{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}

.sponsor-section{padding:70px 0}
.sponsor-section.alt{background:#fff}
.sponsor-inner{max-width:1180px;margin:0 auto;padding:0 24px}
.sponsor-head{text-align:center;margin-bottom:48px}
.sponsor-head .tag{display:inline-block;background:var(--blue-soft);color:var(--brand1);font-size:13px;font-weight:700;padding:6px 16px;border-radius:20px;margin-bottom:14px}
.sponsor-head h2{font-size:32px;font-weight:800;color:var(--ink);margin-bottom:12px}
.sponsor-head p{color:#64748b;font-size:15px;max-width:620px;margin:0 auto;line-height:1.7}

.feature-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.feature-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;transition:all .2s}
.feature-card:hover{border-color:var(--brand1);transform:translateY(-4px);box-shadow:0 14px 36px rgba(22,119,255,.1)}
.feature-card .label{font-size:13px;font-weight:800;color:var(--brand1);margin-bottom:10px;display:flex;align-items:center;gap:6px}
.feature-card .label .dot{width:8px;height:8px;border-radius:50%;background:var(--brand1)}
.feature-card h3{font-size:18px;font-weight:800;color:var(--ink);margin-bottom:10px}
.feature-card p{font-size:14px;color:#64748b;line-height:1.75}

.apply-head-bar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:36px;flex-wrap:wrap}
.apply-head-bar h3{font-size:22px;font-weight:800;color:var(--ink)}
.apply-head-bar p{color:#64748b;font-size:14px;max-width:520px;line-height:1.7}
.apply-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.apply-step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;text-align:center;transition:all .2s;position:relative}
.apply-step:hover{border-color:var(--brand1);transform:translateY(-3px);box-shadow:0 12px 32px rgba(22,119,255,.1)}
.apply-step .icon{width:70px;height:70px;border-radius:50%;background:var(--blue-soft);color:var(--brand1);display:flex;align-items:center;justify-content:center;margin:0 auto 18px}
.apply-step .icon .ym-ic{width:32px;height:32px}
.apply-step h4{font-size:16px;font-weight:800;color:var(--ink);margin-bottom:8px}
.apply-step p{font-size:13px;color:#64748b;line-height:1.7}
.apply-step .num{position:absolute;top:14px;right:18px;font-size:28px;font-weight:900;color:var(--blue-soft);line-height:1}

.plan-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.plan-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:all .2s}
.plan-card:hover{border-color:var(--brand1);box-shadow:0 14px 36px rgba(22,119,255,.1)}
.plan-card-head{display:grid;grid-template-columns:1.1fr .9fr;min-height:220px}
.plan-card-info{padding:28px 28px 24px}
.plan-card-info .tag{display:inline-block;background:#eaf2ff;color:var(--brand1);font-size:12px;font-weight:700;padding:4px 10px;border-radius:10px;margin-bottom:12px}
.plan-card-info h3{font-size:20px;font-weight:800;color:var(--ink);margin-bottom:8px}
.plan-card-info p{font-size:13px;color:#64748b;line-height:1.7;margin-bottom:18px}
.plan-card-info .btn{background:var(--grad);color:#fff;padding:10px 22px;border-radius:8px;font-size:14px;font-weight:700;display:inline-flex;align-items:center;gap:5px;transition:transform .2s}.plan-card-info .btn:hover{transform:translateY(-2px)}
.plan-card-visual{background:linear-gradient(135deg,#f8fafc 0%,#e6f0ff 100%);display:flex;align-items:center;justify-content:center;position:relative}
.plan-card-visual .days{position:absolute;right:20px;top:20px;font-size:13px;color:#64748b;background:#fff;padding:4px 10px;border-radius:6px;box-shadow:0 2px 8px rgba(15,23,42,.06)}
.plan-card-visual .days b{font-size:26px;font-weight:900;color:var(--brand1);display:block;line-height:1}
.plan-card-visual .ym-ic{width:90px;height:90px;color:var(--brand1);opacity:.9}

.rules-wrap{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow)}
.rules-title{font-size:18px;font-weight:800;color:var(--ink);margin-bottom:22px;display:flex;align-items:center;gap:8px}
.rules-list{display:flex;flex-direction:column;gap:14px}
.rule-item{display:flex;gap:14px;align-items:flex-start}
.rule-item .idx{width:26px;height:26px;border-radius:50%;background:var(--blue-soft);color:var(--brand1);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;flex-shrink:0;margin-top:2px}
.rule-item p{font-size:14px;color:#475569;line-height:1.75}

.cases-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.case-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:all .2s}
.case-card:hover{border-color:var(--brand1);box-shadow:0 10px 28px rgba(22,119,255,.08)}
.case-card .logo{height:40px;margin-bottom:14px;display:flex;align-items:center;gap:8px;font-size:18px;font-weight:800;color:var(--ink)}
.case-card .logo .ym-ic{width:32px;height:32px;color:var(--brand1)}
.case-card p{font-size:13px;color:#64748b;line-height:1.75}
.case-card .meta{margin-top:14px;padding-top:14px;border-top:1px dashed var(--line);display:flex;gap:16px;font-size:12px;color:#94a3b8}

.sponsor-cta{background:var(--grad);padding:64px 0;text-align:center;position:relative;overflow:hidden}
.sponsor-cta::before{content:"";position:absolute;left:-80px;top:-80px;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,.08)}
.sponsor-cta::after{content:"";position:absolute;right:-60px;bottom:-60px;width:220px;height:220px;border-radius:50%;background:rgba(255,255,255,.06)}
.sponsor-cta-inner{position:relative;z-index:1;max-width:760px;margin:0 auto;padding:0 24px}
.sponsor-cta h2{font-size:32px;font-weight:900;color:#fff;margin-bottom:12px}
.sponsor-cta p{font-size:16px;color:rgba(255,255,255,.9);margin-bottom:28px}
.sponsor-cta .btn-light{background:#fff;color:var(--brand1);padding:14px 34px;border-radius:12px;font-size:16px;font-weight:800;display:inline-flex;align-items:center;gap:8px;transition:transform .2s,box-shadow .2s}.sponsor-cta .btn-light:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(0,0,0,.15)}

/* footer */
.ft-top{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.ft-top-inner{max-width:1180px;margin:0 auto;padding:36px 24px;display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.ft-promise{display:flex;align-items:center;gap:14px}
.ft-promise .ic{width:44px;height:44px;border-radius:12px;background:#eaf2ff;color:var(--brand1);display:flex;align-items:center;justify-content:center}
.ft-promise .ic .ym-ic{width:24px;height:24px}
.ft-promise h4{font-size:15px;font-weight:700;color:var(--ink)}
.ft-promise p{font-size:13px;color:#94a3b8}
footer{background:#fff;color:var(--text);border-top:1px solid var(--line);font-size:14px}
.ft-inner{max-width:1180px;margin:0 auto;padding:56px 24px 36px;display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:36px}
.ft-logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800;color:var(--ink);margin-bottom:16px}
.ft-info p{margin-bottom:8px;line-height:1.6;color:#64748b;font-size:13px}
.ft-info .qr{display:flex;gap:12px;margin-top:16px}
.ft-info .qr div{width:72px;height:72px;border-radius:8px;background:#f1f5f9;display:flex;align-items:center;justify-content:center;color:#94a3b8;font-size:12px;text-align:center}
.ft-col h4{color:var(--ink);font-size:15px;font-weight:700;margin-bottom:16px}
.ft-col a{display:block;color:#64748b;font-size:13px;margin-bottom:10px;transition:color .15s}
.ft-col a:hover{color:var(--brand1)}
.ft-bottom{max-width:1180px;margin:0 auto;padding:20px 24px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;color:#64748b;font-size:12px}
.ft-bottom .tag{background:#f1f5f9;color:#475569;padding:2px 8px;border-radius:4px}

/* CS面板 */
.cs{position:fixed;right:16px;bottom:100px;z-index:60;display:flex;flex-direction:column;align-items:center;gap:10px}
.cs-online{background:var(--grad);color:#fff;border-radius:26px;padding:10px 8px;display:flex;flex-direction:column;align-items:center;gap:4px;font-size:12px;width:58px;cursor:pointer;box-shadow:0 6px 18px rgba(22,119,255,.35)}
.cs-online .av{width:30px;height:30px;border-radius:50%;background:#fff;display:flex;align-items:center;justify-content:center}
.cs-online .av .ym-ic{width:18px;height:18px;color:var(--brand1)}
.cs-icon{width:42px;height:42px;background:#fff;border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.06);transition:.15s}
.cs-icon .ym-ic{width:18px;height:18px;color:#475569}
.cs-icon:hover{border-color:var(--brand1)}.cs-icon:hover .ym-ic{color:var(--brand1)}

/* 腾讯云风格线性图标（SVG）尺寸适配 */
.ym-ic{width:1em;height:1em;vertical-align:-0.125em;display:inline-block;flex-shrink:0}

@media(max-width:980px){
.sponsor-hero-inner{grid-template-columns:1fr;text-align:center}
.sponsor-hero .lead{margin:0 auto 28px}
.sponsor-hero-actions{justify-content:center}
.feature-cards{grid-template-columns:repeat(2,1fr)}
.apply-steps{grid-template-columns:1fr}
.plan-cards{grid-template-columns:1fr}
.cases-grid{grid-template-columns:repeat(2,1fr)}
.ft-top-inner{grid-template-columns:1fr 1fr}
.ft-inner{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
.nav-menu{display:none}
.sponsor-hero h1{font-size:32px}
.feature-cards{grid-template-columns:1fr}
.cases-grid{grid-template-columns:1fr}
.plan-card-head{grid-template-columns:1fr}
.ft-top-inner{grid-template-columns:1fr}
.ft-inner{grid-template-columns:1fr}
}