/* ===== 基础 ===== */
*{box-sizing:border-box}
:root{
  --primary:#4f6ef7; --primary-d:#3b56d4; --bg:#f5f7fb; --card:#fff;
  --text:#1f2430; --muted:#6b7280; --border:#e5e7eb; --danger:#ef4444;
  --ok:#10b981; --warn:#f59e0b; --radius:12px; --shadow:0 2px 12px rgba(20,30,60,.06);
}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);font-size:15px;line-height:1.5;-webkit-text-size-adjust:100%}
a{color:var(--primary);text-decoration:none}
a:hover{opacity:.85}
img{max-width:100%}
.wrap{max-width:960px;margin:0 auto;padding:0 16px;width:100%}

/* ===== 顶栏 ===== */
.topbar{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:58px}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;color:var(--text);font-size:16px}
.brand-logo{width:28px;height:28px}
.nav{display:flex;align-items:center;gap:14px}
.nav a{color:var(--muted);font-size:14px}
.nav a.btn-primary,.nav a.btn-ghost{padding:6px 14px;border-radius:8px}
.btn-primary{background:var(--primary);color:#fff!important}
.btn-ghost{border:1px solid var(--border);color:var(--text)!important}

/* ===== 内容卡片 ===== */
.content{padding:24px 16px 0}
.footer{text-align:center;padding:10px 16px;color:var(--muted);font-size:13px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:20px;margin-bottom:20px}
.card h2{margin:0 0 14px;font-size:18px}
.card h3{margin:18px 0 10px;font-size:15px;color:var(--muted)}
.muted{color:var(--muted)}
.center{text-align:center}

/* ===== 首页英雄 ===== */
.hero{text-align:center;padding:40px 16px 28px}
.hero h1{font-size:26px;margin:0 0 10px}
.hero p{color:var(--muted);margin:0 auto 22px;max-width:560px}
.tabs{display:flex;gap:8px;justify-content:center;margin:0 auto 16px;flex-wrap:wrap}
.tab{padding:10px 22px;border-radius:999px;background:var(--card);border:1px solid var(--border);
  color:var(--muted);cursor:pointer;font-size:14px}
.tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* 首页上传/取件双栏：桌面左右等高、手机上下 */
.home-grid{display:flex;gap:20px;align-items:stretch}
.home-grid > .card{flex:1;min-width:0;margin-bottom:20px;display:flex;flex-direction:column}
#upload-form{flex:1;display:flex;flex-direction:column}
#upload-submit{margin-top:auto}
.retrieve-intro{text-align:center;padding:4px 8px 20px}
.retrieve-intro h3{font-size:17px;margin:0 0 8px;color:var(--text)}
.retrieve-intro p{color:var(--muted);font-size:13px;margin:0;line-height:1.6}
.retrieve-form{margin-top:auto}

/* ===== 表单 ===== */
.field{margin-bottom:14px}
.field label{display:block;margin-bottom:6px;font-size:13px;color:var(--muted)}
input[type=text],input[type=password],input[type=email],input[type=number],input[type=tel],input[type=search],textarea,select{
  width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:8px;font-size:15px;
  background:#fff;color:var(--text)}
textarea{min-height:120px;resize:vertical;font-family:inherit}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,110,247,.12)}
.btn{display:inline-block;padding:10px 20px;border-radius:8px;border:none;cursor:pointer;font-size:15px;
  background:var(--primary);color:#fff;text-align:center}
.btn:hover{background:var(--primary-d)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-block{display:block;width:100%}
.btn-outline{background:#fff;color:var(--primary);border:1px solid var(--primary)}
.btn-sm{padding:6px 12px;font-size:13px}
.btn-danger{background:var(--danger)}
.btn-success{background:var(--ok)}
.btn-success:hover{background:#0c8a65}

/* ===== 上传拖拽区 ===== */
/* 文本/文件面板等高：切换标签时卡片大小不变 */
[data-panel]{min-height:185px;margin-bottom:14px}
[data-panel] > .field{margin-bottom:0}
[data-panel="panel-file"]{display:flex;flex-direction:column}
.dropzone{border:2px dashed var(--border);border-radius:var(--radius);padding:28px;text-align:center;
  color:var(--muted);background:#fafbff;cursor:pointer;transition:.15s;
  flex:1;display:flex;flex-direction:column;justify-content:center}
.dropzone:hover,.dropzone.drag{border-color:var(--primary);background:#f0f4ff;color:var(--primary)}
.dropzone .dz-icon{font-size:34px;display:block;margin-bottom:6px}
.file-info{margin-top:10px;padding:10px;background:#f0f4ff;border-radius:8px;font-size:13px;display:flex;
  justify-content:space-between;align-items:center}

/* 有效期选择器 */
.expire-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.expire-row select,.expire-row input{width:auto;flex:1;min-width:90px}

/* ===== 取件结果 ===== */
.result-box{text-align:center}
/* 上传成功结果：覆盖在上传卡片内，卡片大小保持不变 */
#upload{position:relative}
#upload-result{position:absolute;inset:20px;background:var(--card);
  align-items:center;justify-content:center;overflow:auto;border-radius:8px}
/* 取件结果：覆盖在取件卡片内，卡片大小保持不变 */
#retrieve{position:relative}
#retrieve-result{position:absolute;inset:20px;background:var(--card);
  align-items:center;justify-content:center;overflow:auto;border-radius:8px}
#retrieve-result .retrieve-view{width:100%;text-align:center}
#retrieve-result pre{text-align:left;background:#f6f8fc;padding:14px;border-radius:8px;
  white-space:pre-wrap;word-break:break-word;border:1px solid var(--border);max-height:180px;overflow:auto;font-size:13px}
.qr-wrap{display:inline-block;padding:12px;background:#fff;border:1px solid var(--border);border-radius:12px}
.qr-wrap img{display:block;width:220px;height:220px}
.pickup-code{font-size:30px;font-weight:700;letter-spacing:4px;color:var(--primary);margin:14px 0 4px;font-family:monospace}
.result-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:14px}

/* ===== 滑动验证码 ===== */
.captcha-wrap{margin:14px 0;overflow-x:auto;-webkit-overflow-scrolling:touch}
.captcha-inner{width:300px}
.captcha-box{position:relative;width:300px;height:180px;border-radius:8px;overflow:hidden;background:#eee;border:1px solid var(--border)}
.captcha-box canvas,.captcha-box img.bg{position:absolute;left:0;top:0;width:100%;height:100%}
.captcha-piece{position:absolute;top:0;left:0;height:100%;pointer-events:none}
.slider-track{position:relative;width:300px;height:38px;background:#eef1f6;border-radius:19px;margin-top:10px;border:1px solid var(--border)}
.slider-track .tip{position:absolute;left:0;right:0;text-align:center;line-height:38px;color:var(--muted);font-size:13px}
.slider-handle{position:absolute;left:0;top:0;width:38px;height:38px;border-radius:19px;background:var(--primary);
  color:#fff;display:flex;align-items:center;justify-content:center;cursor:grab;font-size:18px;box-shadow:0 2px 6px rgba(0,0,0,.15)}
.slider-handle.ok{background:var(--ok)}
.slider-handle.fail{background:var(--danger)}
.slider-progress{position:absolute;left:0;top:0;height:100%;background:rgba(79,110,247,.18);border-radius:19px}

/* ===== 表格 ===== */
.table{width:100%;border-collapse:collapse;font-size:14px}
.table th,.table td{padding:10px 8px;border-bottom:1px solid var(--border);text-align:left;vertical-align:middle}
.table th{color:var(--muted);font-weight:600;font-size:13px}
.table tr:hover{background:#fafbff}
.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;background:#eef1f6;color:var(--muted)}
.badge.ok{background:#e7f8f0;color:var(--ok)}
.badge.warn{background:#fff5e0;color:var(--warn)}
.badge.danger{background:#fde8e8;color:var(--danger)}
.mono{font-family:monospace}

/* ===== 提示 ===== */
.alert{padding:12px 14px;border-radius:8px;margin-bottom:16px;font-size:14px}
.alert.info{background:#eef4ff;color:var(--primary-d)}
.alert.success{background:#e7f8f0;color:#0c8a65}
.alert.error{background:#fde8e8;color:#b91c1c}

/* ===== 后台布局 ===== */
.admin-body{background:var(--bg)}
.admin-layout{display:flex;min-height:100vh}
.sidebar{width:220px;background:var(--card);border-right:1px solid var(--border);padding:16px 12px;flex-shrink:0;
  position:sticky;top:0;height:100vh;overflow:auto}
.sidebar .brand{padding:6px 8px 16px;font-size:15px}
.side-nav{display:flex;flex-direction:column;gap:2px}
.side-nav a{padding:10px 12px;border-radius:8px;color:var(--muted);font-size:14px}
.side-nav a.active{background:#eef4ff;color:var(--primary);font-weight:600}
.side-nav a.side-back{margin-top:12px;color:var(--muted);font-size:13px}
.admin-main{flex:1;min-width:0;display:flex;flex-direction:column}
.admin-topbar{height:54px;background:var(--card);border-bottom:1px solid var(--border);display:flex;
  align-items:center;justify-content:space-between;padding:0 18px;position:sticky;top:0;z-index:10}
.admin-user{font-size:14px;color:var(--muted)}
.menu-toggle{display:none;background:none;border:none;font-size:22px;cursor:pointer}
.admin-content{padding:20px;flex:1}
.admin-footer{padding:12px 18px;text-align:center;color:var(--muted);font-size:12px;border-top:1px solid var(--border);background:var(--card)}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-bottom:20px}
.stat{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.stat .num{font-size:24px;font-weight:700;color:var(--primary)}
.stat .lbl{color:var(--muted);font-size:13px;margin-top:2px}

.pager{display:flex;gap:6px;justify-content:center;margin-top:16px;flex-wrap:wrap}
.pager a,.pager span{padding:6px 10px;border:1px solid var(--border);border-radius:6px;font-size:13px;background:#fff}
.pager span.cur{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ===== 响应式 ===== */
@media (max-width:760px){
  .nav{gap:10px}
  .nav a{font-size:13px}
  .hero h1{font-size:22px}
  .home-grid{flex-direction:column}
  .sidebar{position:fixed;left:-240px;top:0;z-index:40;transition:.2s;height:100vh}
  .sidebar.open{left:0}
  .menu-toggle{display:block}
  .admin-content{padding:14px}
  .table{font-size:13px}
  .table th,.table td{padding:8px 6px}
  .qr-wrap img{width:180px;height:180px}
  .captcha-wrap{overflow-x:auto}
}

/* 预览 */
.preview-box{margin-top:14px;text-align:center}
.preview-box img,.preview-box video,.preview-box audio{max-width:100%;border-radius:8px}
.kv{display:grid;grid-template-columns:90px 1fr;gap:6px 12px;font-size:14px;margin:12px 0}
.kv dt{color:var(--muted)}
.kv dd{margin:0;word-break:break-all}