/* 活动现场系统 - 通用样式（后台 / 前台表单） */
*{box-sizing:border-box}
:root{--bg:#f1f5f9;--card:#ffffff;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--pri:#0ea5e9;--pri-d:#0284c7;--danger:#dc2626;--ok:#16a34a}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);font-size:15px;line-height:1.6}
a{color:var(--pri);text-decoration:none}
a:hover{text-decoration:underline}

/* 顶部导航 */
.topnav{display:flex;align-items:center;gap:18px;background:#0f172a;color:#e2e8f0;padding:0 24px;height:54px}
.topnav a{color:#cbd5e1;font-size:14px}
.topnav a:hover{color:#fff;text-decoration:none}
.topnav .brand{font-size:17px;font-weight:700;color:#fff;margin-right:8px}
.topnav .spacer{flex:1}
.topnav .who{font-size:13px;color:#94a3b8}

.wrap{max-width:1040px;margin:0 auto;padding:28px 20px 60px}
body.bare .wrap{max-width:520px}

/* 卡片 */
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px 26px;margin-bottom:22px;box-shadow:0 1px 3px rgba(15,23,42,.05)}
.card h2{margin:0 0 14px;font-size:18px}
.card-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.card-head h2{margin:0}
.narrow-card{max-width:640px}

/* 首页 hero */
.hero{text-align:center;padding:56px 20px 40px}
.hero.narrow{padding:80px 20px 40px}
.hero h1{font-size:30px;margin:0 0 10px}
.hero p{color:var(--muted);margin:0 0 26px}
.codebox{display:flex;gap:10px;justify-content:center;max-width:440px;margin:0 auto}
.codebox.col{flex-direction:column;gap:14px}
.codebox input{flex:1;padding:13px 16px;border:1px solid var(--line);border-radius:10px;font-size:16px;background:#fff}
.codebox input:focus{outline:none;border-color:var(--pri);box-shadow:0 0 0 3px rgba(14,165,233,.15)}
.codebox button,.btn{padding:13px 26px;border:0;border-radius:10px;background:var(--pri);color:#fff;font-size:16px;cursor:pointer;white-space:nowrap}
.codebox button:hover,.btn:hover{background:var(--pri-d)}
.btn{display:inline-block;padding:8px 18px;font-size:14px}
.btn.big{width:100%;margin-top:18px;padding:12px}
.cards3{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;padding:0 20px 40px}
.cards3 .card h3{margin:0 0 8px}
.cards3 .card p{color:var(--muted);font-size:14px;margin:0}

/* 表格 */
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:middle}
th{color:var(--muted);font-weight:600;font-size:13px}
.ops a{margin-right:10px;font-size:13px;white-space:nowrap}
code{background:#f1f5f9;padding:2px 8px;border-radius:6px;font-size:13px}
.muted{color:var(--muted);font-size:13px}
.ok-text{color:var(--ok)}
.danger{color:var(--danger)}
.link{background:none;border:0;color:var(--pri);cursor:pointer;font-size:13px;padding:0}
.link.danger{color:var(--danger)}
.link:hover{text-decoration:underline}

/* 表单 */
label{display:block;font-size:13px;color:var(--muted);margin:14px 0 5px}
input,select,textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:9px;font-size:14px;font-family:inherit;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--pri);box-shadow:0 0 0 3px rgba(14,165,233,.12)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
.inline-form{display:flex;gap:10px;align-items:center;margin:14px 0;flex-wrap:wrap}
.inline-form.wrap-form input,.inline-form.wrap-form select{width:auto;min-width:130px}
.addbox,.editbox{margin:10px 0}
.addbox summary,.editbox summary{cursor:pointer;font-size:14px;color:var(--pri);user-select:none}
.editbox summary{display:inline}
hr{border:0;border-top:1px solid var(--line);margin:24px 0}

/* 统计 */
.stats{display:flex;gap:36px}
.stats div{display:flex;flex-direction:column}
.stats b{font-size:32px;color:var(--pri)}
.stats span{color:var(--muted);font-size:13px}

/* 提示条 */
.flash{border-radius:10px;padding:12px 16px;margin-bottom:18px;font-size:14px}
.flash.ok{background:#f0fdf4;border:1px solid #bbf7d0;color:#166534}
.flash.err{background:#fef2f2;border:1px solid #fecaca;color:#991b1b}

@media (max-width:640px){
    .codebox{flex-direction:column}
    .grid2{grid-template-columns:1fr}
    .topnav{gap:12px;padding:0 14px}
    .hero h1{font-size:24px}
}

/* 教育版补充：页签 / 投票表单 / 复选行 */
.tabs{display:flex;gap:14px;margin:4px 0 12px;font-size:14px}
.tabs a{padding:2px 0;border-bottom:2px solid transparent}
.tabs a.cur{border-color:var(--pri);color:var(--pri-d);font-weight:600}
.checkline{display:flex!important;align-items:center;gap:8px;margin-top:10px!important;color:var(--ink)!important;font-size:14px!important}
.pollform{display:flex;flex-direction:column;gap:10px;margin:10px 0 16px}
.pollform input,.pollform textarea{width:100%}
.inline-form input[type=color]{padding:2px;height:38px;min-width:44px}

/* 签到页头像上传 */
.fileinput{padding:9px 12px;font-size:14px;color:var(--muted)}
.fileinput::file-selector-button{padding:6px 14px;margin-right:10px;border:0;border-radius:8px;background:var(--pri);color:#fff;font-size:13px;cursor:pointer}

/* 签到成功面板 / 相片上传行 / 手动签到码 */
.donebox{background:#f0fdf4;border:1px solid #bbf7d0;border-radius:14px;padding:26px 20px;text-align:center}
.donebox .done-emoji{font-size:44px}
.donebox h2{margin:6px 0 8px;color:#166534}
.donebox .muted b{color:#0ea5e9;font-size:1.15em}
.uploadline{display:flex!important;flex-direction:column;gap:6px;align-items:flex-start;background:#f8fafc;border:1px dashed #cbd5e1;border-radius:10px;padding:10px 12px;font-size:13px!important;color:#475569!important;margin:0!important}
.uploadline input{width:100%}
.manualbox{margin-top:22px}
.manualbox summary{cursor:pointer;color:var(--muted);font-size:14px}
.manualbox .codebox{margin-top:12px}

/* 签到时间期限提示 */
.winline{margin:14px 0 0;font-size:13px;color:#b45309;background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:8px 14px;text-align:center}
.donebox.closedbox{background:#f8fafc;border-color:#e2e8f0}
.donebox.closedbox h2{color:#334155}