/* 竞赛子站 · 前台样式（活动行 / 赛氪风格） */
:root{
  --cbrand:#2563eb; --cbrand2:#4f8cff;
  --c-text:#0f172a; --c-text2:#64748b; --c-text3:#94a3b8;
  --c-line:#e5e9f0; --c-bg:#f5f7fb; --c-card:#fff;
  --c-radius:16px; --c-radius-sm:10px;
  --c-shadow:0 6px 24px rgba(15,23,42,.06);
}
*{box-sizing:border-box;margin:0;padding:0}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
html{-webkit-text-size-adjust:100%}
body.c-body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,sans-serif;color:var(--c-text);background:var(--c-bg);font-size:15px;line-height:1.6}
.c-container{max-width:1180px;margin:0 auto;padding:0 20px}

/* 顶部导航 */
.c-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--c-line)}
.c-header-in{display:flex;align-items:center;height:64px;gap:28px}
.c-brand{display:flex;align-items:center;gap:10px}
.c-brand-mark{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--cbrand),var(--cbrand2));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px}
.c-brand img{height:36px;width:auto;border-radius:8px}
.c-brand-text{display:flex;flex-direction:column;line-height:1.1}
.c-brand-text strong{font-size:16px}
.c-brand-text em{font-size:10px;color:var(--c-text3);font-style:normal;letter-spacing:.14em}
.c-nav{display:flex;gap:22px;flex:1}
.c-nav a{font-size:15px;color:var(--c-text2);padding:6px 2px;font-weight:500;position:relative}
.c-nav a.on,.c-nav a:hover{color:var(--cbrand)}
.c-nav a.on::after{content:"";position:absolute;left:0;right:0;bottom:-14px;height:3px;border-radius:3px;background:var(--cbrand)}
.c-header-actions{display:flex;align-items:center;gap:10px}
.c-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 18px;border-radius:999px;font-size:14px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:all .2s}
.c-btn-primary{background:var(--cbrand);color:#fff}
.c-btn-primary:hover{filter:brightness(1.06)}
.c-btn-ghost{background:#fff;border-color:var(--c-line);color:var(--c-text2)}
.c-btn-ghost:hover{border-color:var(--cbrand);color:var(--cbrand)}
.c-btn-block{width:100%}
.c-btn-lg{padding:13px 30px;font-size:16px}
.c-btn[disabled]{opacity:.6;cursor:not-allowed}
.c-user{position:relative}
.c-user-btn{display:flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--c-line);border-radius:999px;padding:5px 14px 5px 5px;cursor:pointer;font-size:14px}
.c-avatar{width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,var(--cbrand),var(--cbrand2));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}
.c-user-menu{position:absolute;right:0;top:calc(100% + 8px);min-width:170px;background:#fff;border:1px solid var(--c-line);border-radius:12px;box-shadow:var(--c-shadow);padding:6px;display:none}
.c-user-menu.show{display:block}
.c-user-menu a{display:block;padding:9px 12px;border-radius:8px;font-size:14px;color:var(--c-text2)}
.c-user-menu a:hover{background:var(--c-bg);color:var(--cbrand)}

.c-main{min-height:60vh;padding-bottom:60px}

/* Hero */
.c-hero{background:linear-gradient(120deg,#1e3a8a,#2563eb 55%,#4f8cff);color:#fff;padding:56px 0 84px;position:relative;overflow:hidden}
.c-hero::after{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;background:rgba(255,255,255,.09)}
.c-hero-in{position:relative;z-index:2}
.c-hero h1{font-size:34px;font-weight:800;letter-spacing:.5px}
.c-hero p{margin-top:14px;font-size:16px;opacity:.9;max-width:620px}
.c-hero-search{margin-top:26px;display:flex;gap:10px;max-width:640px;background:#fff;border-radius:999px;padding:6px 6px 6px 20px;align-items:center}
.c-hero-search input{flex:1;border:0;outline:0;font-size:15px;padding:10px 0;background:transparent}
.c-hero-search .c-btn{border-radius:999px}

/* 卡片 / 区块 */
.c-section{padding:44px 0}
.c-pull{margin-top:-56px;position:relative;z-index:3}
.c-sec-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:22px}
.c-sec-head h2{font-size:22px;font-weight:800}
.c-sec-head .c-sec-desc{color:var(--c-text2);font-size:14px;margin-top:4px}
.c-sec-head a{font-size:14px;color:var(--cbrand)}

.c-card{background:var(--c-card);border:1px solid var(--c-line);border-radius:var(--c-radius);overflow:hidden;transition:transform .2s,box-shadow .2s}
.c-card:hover{transform:translateY(-3px);box-shadow:var(--c-shadow)}
.c-grid{display:grid;gap:20px}
.c-grid-3{grid-template-columns:repeat(3,1fr)}
.c-grid-2{grid-template-columns:repeat(2,1fr)}
.c-grid-4{grid-template-columns:repeat(4,1fr)}

/* 赛事卡片 */
.contest-card .cc-cover{height:164px;background:linear-gradient(135deg,var(--cbrand),var(--cbrand2));position:relative;overflow:hidden}
.contest-card .cc-cover img{width:100%;height:100%;object-fit:cover}
.contest-card .cc-cover .cc-cover-ph{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,.9);font-size:34px;font-weight:800}
.cc-body{padding:16px 18px}
.cc-title{font-size:16px;font-weight:700;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:44px}
.cc-meta{margin-top:12px;display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--c-text2)}
.cc-fee{color:#ef3b52;font-weight:700}
.cc-fee.free{color:#16a34a}
.cc-tags{margin-top:10px;display:flex;gap:6px;flex-wrap:wrap}
.c-tag{display:inline-block;font-size:12px;padding:2px 9px;border-radius:999px;background:#eff4ff;color:var(--cbrand)}
.c-tag-gray{background:#f1f5f9;color:var(--c-text2)}
.c-tag-red{background:#fef2f2;color:#dc2626}
.c-tag-green{background:#ecfdf5;color:#16a34a}

/* 状态徽标 */
.c-badge{display:inline-block;font-size:12px;padding:2px 10px;border-radius:999px;font-weight:600}
.c-badge-on{background:#ecfdf5;color:#16a34a}
.c-badge-off{background:#f1f5f9;color:var(--c-text2)}
.c-badge-red{background:#fef2f2;color:#dc2626}
.c-badge-blue{background:#eff4ff;color:var(--cbrand)}

/* 筛选条 */
.c-filter{display:flex;gap:10px;flex-wrap:wrap;background:#fff;border:1px solid var(--c-line);border-radius:var(--c-radius);padding:14px 16px;margin-bottom:22px}
.c-filter select,.c-filter input{border:1px solid var(--c-line);border-radius:var(--c-radius-sm);padding:9px 12px;font-size:14px;outline:0;background:#fff}
.c-filter input{flex:1;min-width:180px}
.c-filter select:focus,.c-filter input:focus{border-color:var(--cbrand)}

/* 分页 */
.c-pager{display:flex;gap:8px;justify-content:center;margin-top:32px;flex-wrap:wrap}
.c-pager a,.c-pager span{min-width:38px;height:38px;display:flex;align-items:center;justify-content:center;border:1px solid var(--c-line);border-radius:10px;font-size:14px;background:#fff;padding:0 12px}
.c-pager .on{background:var(--cbrand);color:#fff;border-color:var(--cbrand)}

/* 表单 */
.c-form{background:#fff;border:1px solid var(--c-line);border-radius:var(--c-radius);padding:26px}
.cfield{margin-bottom:18px}
.cfield-label{display:block;font-size:14px;font-weight:600;margin-bottom:7px}
.cfield-label .req{color:#dc2626}
.cfield-input{width:100%;border:1px solid var(--c-line);border-radius:var(--c-radius-sm);padding:11px 13px;font-size:15px;outline:0;font-family:inherit;background:#fff}
.cfield-input:focus{border-color:var(--cbrand);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
textarea.cfield-input{min-height:110px;resize:vertical}
.cfield-check{display:inline-flex;align-items:center;gap:6px;margin-right:16px;font-size:14px}
.c-alert{padding:12px 16px;border-radius:12px;font-size:14px;margin-bottom:18px}
.c-alert-err{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c}
.c-alert-ok{background:#ecfdf5;border:1px solid #bbf7d0;color:#15803d}
.c-alert-info{background:#eff6ff;border:1px solid #bfdbfe;color:#1d4ed8}
.c-auth-tabs{display:flex;gap:8px;margin-bottom:18px}
.c-auth-tab{flex:1;padding:10px 6px;border:1px solid var(--c-line);background:#fff;color:var(--c-text2);border-radius:11px;font-size:13.5px;font-weight:600;cursor:pointer;font-family:inherit;transition:border-color .18s,color .18s,background .18s}
.c-auth-tab.active{border-color:var(--cbrand);color:var(--cbrand);background:rgba(37,99,235,.06)}
.c-auth-hidden{display:none !important}
.c-auth-panel{text-align:center}
.c-qr-box{width:200px;height:200px;margin:4px auto 10px;border:1px solid var(--c-line);border-radius:14px;display:flex;align-items:center;justify-content:center;background:#fff;overflow:hidden}
.c-qr-img{width:100%;height:100%;object-fit:contain;display:block}
.c-qr-loading{color:var(--c-text2);font-size:13px;padding:0 14px;line-height:1.7}
.c-qr-refresh{display:inline-block;background:none;border:0;color:var(--cbrand);font-size:13px;font-weight:600;cursor:pointer;padding:4px 8px;font-family:inherit}

/* 表格 */
.c-table-wrap{background:#fff;border:1px solid var(--c-line);border-radius:var(--c-radius);overflow:auto}
.c-table{width:100%;border-collapse:collapse;font-size:14px;min-width:560px}
.c-table th,.c-table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--c-line);white-space:nowrap}
.c-table th{background:#f8fafc;font-weight:600;color:var(--c-text2);font-size:13px}
.c-table tr:last-child td{border-bottom:0}
.c-table td.wrap{white-space:normal}

/* 面板 / 标签页 */
.c-panel{background:#fff;border:1px solid var(--c-line);border-radius:var(--c-radius);padding:22px;margin-bottom:18px}
.c-panel h3{font-size:17px;font-weight:700;margin-bottom:14px}
.c-tabs{display:flex;gap:4px;border-bottom:1px solid var(--c-line);margin-bottom:20px;flex-wrap:wrap}
.c-tabs a{padding:11px 16px;font-size:15px;color:var(--c-text2);border-bottom:2px solid transparent;font-weight:500}
.c-tabs a.on{color:var(--cbrand);border-bottom-color:var(--cbrand)}

/* 时间轴（赛程） */
.c-timeline{position:relative;padding-left:26px}
.c-timeline::before{content:"";position:absolute;left:8px;top:6px;bottom:6px;width:2px;background:var(--c-line)}
.c-tl-item{position:relative;margin-bottom:22px}
.c-tl-item::before{content:"";position:absolute;left:-22px;top:5px;width:12px;height:12px;border-radius:50%;background:#fff;border:3px solid var(--cbrand)}
.c-tl-item.done::before{background:var(--cbrand)}
.c-tl-item h4{font-size:15px;font-weight:700}
.c-tl-item .c-tl-meta{font-size:13px;color:var(--c-text2);margin-top:4px}
.c-tl-item .c-tl-actions{margin-top:8px}

/* 赛事详情 */
.c-detail-head{background:#fff;border-bottom:1px solid var(--c-line);padding:26px 0}
.c-detail-cover{width:100%;max-height:340px;object-fit:cover;border-radius:var(--c-radius)}
.c-detail-grid{display:grid;grid-template-columns:1fr 340px;gap:24px;align-items:start}
.c-aside-card{background:#fff;border:1px solid var(--c-line);border-radius:var(--c-radius);padding:20px;position:sticky;top:84px}
.c-fee-big{font-size:30px;font-weight:800;color:#ef3b52}
.c-fee-big.free{color:#16a34a}
.c-countdown{display:flex;gap:8px;margin:14px 0}
.c-countdown .cd-cell{flex:1;background:var(--c-bg);border-radius:10px;padding:8px 0;text-align:center}
.c-countdown .cd-num{font-size:20px;font-weight:800;color:var(--cbrand)}
.c-countdown .cd-lab{font-size:11px;color:var(--c-text3)}

/* 评论区 */
.c-comment{background:#fff;border:1px solid var(--c-line);border-radius:var(--c-radius);padding:20px;margin-top:18px}
.c-comment-item{padding:14px 0;border-bottom:1px solid var(--c-line)}
.c-comment-item:last-child{border-bottom:0}
.c-comment-head{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--c-text2)}
.c-comment-body{margin-top:6px;font-size:14px}
.c-comment-reply{margin-left:22px;border-left:2px solid var(--c-line);padding-left:14px;margin-top:10px}
.c-comment-form{margin-top:14px}

/* 答题 */
.quiz-card{background:#fff;border:1px solid var(--c-line);border-radius:var(--c-radius);padding:24px;margin-bottom:16px}
.quiz-stem{font-size:16px;font-weight:600;margin-bottom:14px}
.quiz-opt{display:block;padding:11px 14px;border:1px solid var(--c-line);border-radius:var(--c-radius-sm);margin-bottom:10px;cursor:pointer}
.quiz-opt:hover{border-color:var(--cbrand);background:#f8fbff}
.quiz-opt input{margin-right:10px}
.quiz-bar{position:sticky;bottom:0;background:rgba(255,255,255,.95);border-top:1px solid var(--c-line);padding:14px 0;display:flex;align-items:center;justify-content:space-between;gap:14px;backdrop-filter:blur(10px)}
.quiz-timer{font-size:16px;font-weight:700;color:#dc2626}

/* 材料上传 */
.upload-box{border:2px dashed var(--c-line);border-radius:var(--c-radius);padding:32px;text-align:center;color:var(--c-text2);cursor:pointer;transition:border-color .2s}
.upload-box:hover,.upload-box.drag{border-color:var(--cbrand);background:#f8fbff}
.upload-list{margin-top:14px}
.upload-file{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border:1px solid var(--c-line);border-radius:10px;margin-bottom:8px;font-size:14px}

/* 空状态 */
.c-empty{padding:60px 20px;text-align:center;color:var(--c-text2);background:#fff;border:1px dashed var(--c-line);border-radius:var(--c-radius)}
.c-empty svg{width:44px;height:44px;color:var(--c-text3);margin-bottom:10px}

/* 页脚 */
.c-footer{background:#0f172a;color:#cbd5e1;margin-top:40px}
.c-footer-in{display:flex;justify-content:space-between;gap:30px;padding:40px 20px 24px;flex-wrap:wrap}
.c-footer-brand strong{color:#fff;font-size:18px}
.c-footer-brand p{margin-top:8px;max-width:360px;font-size:13px;color:#94a3b8}
.c-footer-links{display:flex;flex-direction:column;gap:8px;font-size:14px}
.c-footer-links a:hover{color:#fff}
.c-footer-meta{display:flex;flex-direction:column;gap:8px;font-size:13px;color:#94a3b8}
.c-footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:16px 20px;text-align:center;font-size:13px;color:#94a3b8}
.c-footer-bottom a{color:#94a3b8}

/* 响应式 */
@media (max-width:900px){
  .c-grid-3,.c-grid-4{grid-template-columns:repeat(2,1fr)}
  .c-detail-grid{grid-template-columns:1fr}
  .c-aside-card{position:static}
}
@media (max-width:640px){
  .c-header-in{height:56px;gap:12px}
  .c-nav{display:none}
  .c-grid-3,.c-grid-4,.c-grid-2{grid-template-columns:1fr}
  .c-hero{padding:36px 0 66px}
  .c-hero h1{font-size:24px}
  .c-purll{margin-top:-44px}
  .c-pull{margin-top:-44px}
  .c-sec-head h2{font-size:19px}
  .c-user-name{display:none}
  .c-footer-in{flex-direction:column;gap:20px}
}