:root{
    --bg:#f5f7fb;
    --card:#ffffff;
    --ink:#1f2937;
    --muted:#6b7280;
    --brand:#4f46e5;
    --brand2:#6366f1;
    --line:#eceef3;
    --shadow:0 6px 24px rgba(31,41,55,.08);
    --radius:16px;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
a{color:var(--brand);text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* 头部 */
.site-header{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;padding:56px 0 48px;text-align:center}
.site-header h1{margin:0;font-size:32px;letter-spacing:1px}
.subtitle{margin:8px 0 0;opacity:.9;font-size:15px}

/* 卡片网格 */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;margin:36px 0}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(31,41,55,.14)}
.card{min-height:150px}
.card-body{padding:20px 18px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-title{margin:0;font-size:17px;line-height:1.4}
.card-desc{margin:0;color:var(--muted);font-size:13px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-cta{margin-top:auto;color:var(--brand);font-size:13px;font-weight:600}
.admin-card .card-body{padding-top:42px}

.empty-state{text-align:center;padding:80px 20px;color:var(--muted)}
.empty-state .btn{margin-top:16px}

/* 按钮 */
.btn{display:inline-block;background:var(--brand);color:#fff;border:none;padding:10px 20px;border-radius:10px;font-size:14px;cursor:pointer;transition:background .15s}
.btn:hover{background:var(--brand2)}
.btn.ghost{background:transparent;color:var(--brand);border:1px solid var(--brand)}
.btn.ghost:hover{background:rgba(79,70,229,.08)}

/* 弹窗 */
.modal{position:fixed;inset:0;display:none;align-items:center;justify-content:center;z-index:50}
.modal.show{display:flex}
.modal-mask{position:absolute;inset:0;background:rgba(17,24,39,.55);backdrop-filter:blur(2px)}
.modal-card{position:relative;background:#fff;border-radius:18px;padding:28px 28px 30px;width:320px;max-width:92vw;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.25);animation:pop .18s ease}
@keyframes pop{from{transform:scale(.92);opacity:0}to{transform:scale(1);opacity:1}}
.modal-close{position:absolute;top:10px;right:14px;border:none;background:none;font-size:26px;line-height:1;color:var(--muted);cursor:pointer}
.modal-title{margin:0 0 6px;font-size:20px}
.modal-desc{margin:0 0 18px;color:var(--muted);font-size:13px;min-height:18px}
.modal-qr{min-height:240px;display:flex;align-items:center;justify-content:center;background:#fafafa;border-radius:12px;padding:12px}
.modal-qr img.qr-img{max-width:240px;max-height:240px}
.qr-fallback{color:var(--muted);font-size:13px;word-break:break-all;padding:10px}
.modal-link{margin-top:18px;width:100%;text-align:center}

/* 页脚 */
.site-footer{border-top:1px solid var(--line);margin-top:40px;padding:20px 0;color:var(--muted);font-size:13px;text-align:center}

/* 登录页 */
.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh}
.login-box{background:#fff;border-radius:18px;box-shadow:var(--shadow);padding:40px 36px;width:340px;max-width:92vw;text-align:center}
.login-box h1{margin:0 0 24px;font-size:22px;color:var(--brand)}
.login-box label{display:block;text-align:left;font-size:13px;color:var(--muted);margin-bottom:14px}
.login-box input{width:100%;margin-top:6px;padding:11px 12px;border:1px solid var(--line);border-radius:10px;font-size:14px;outline:none}
.login-box input:focus{border-color:var(--brand)}
.login-box .btn{width:100%;margin-top:8px}
.login-err{color:#dc2626;font-size:13px;margin:0 0 14px}
.back-link{display:inline-block;margin-top:16px;font-size:13px}

/* 后台 */
.admin-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.admin-bar{display:flex;align-items:center;justify-content:space-between;padding:14px 20px}
.admin-bar strong{font-size:17px;color:var(--brand)}
.admin-actions{display:flex;gap:10px}
.admin-page{background:var(--bg)}
.notice{background:#ecfdf5;color:#047857;border:1px solid #a7f3d0;padding:10px 14px;border-radius:10px;margin:20px 0;font-size:14px}
.panel{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:22px 24px;margin:22px 0}
.panel h2{margin:0 0 16px;font-size:18px}
.tool-form label{display:block;font-size:13px;color:var(--muted);margin-bottom:14px}
.tool-form input[type=text],.tool-form textarea,.tool-form input[type=file]{width:100%;margin-top:6px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;font-size:14px;font-family:inherit;outline:none}
.tool-form textarea{resize:vertical}
.tool-form input:focus,.tool-form textarea:focus{border-color:var(--brand)}
.cur-img{margin:-4px 0 14px;font-size:13px;color:var(--muted)}
.cur-img img{max-height:80px;border-radius:8px;vertical-align:middle;margin-left:6px}
.chk{display:flex;align-items:center;gap:6px;color:var(--ink)}
.form-btns{display:flex;gap:10px;margin-top:6px}

.tool-table{width:100%;border-collapse:collapse;font-size:14px}
.tool-table th,.tool-table td{text-align:left;padding:11px 10px;border-bottom:1px solid var(--line)}
.tool-table th{color:var(--muted);font-weight:600;font-size:13px}
.tool-table .muted{color:var(--muted)}
.tag{display:inline-block;padding:2px 10px;border-radius:999px;background:#f1f5f9;color:var(--muted);font-size:12px}
.tag.ok{background:#eef2ff;color:var(--brand)}
.ops{white-space:nowrap}
.op{margin-right:12px;font-weight:600}
.op.danger{color:#dc2626}
.muted{color:var(--muted)}

/* 后台卡片网格（与前台一致 + 操作） */
.drag-tip{color:var(--muted);font-size:13px;margin:20px 0 0}
.admin-card{position:relative}
.drag-handle{position:absolute;top:8px;left:8px;z-index:3;width:26px;height:26px;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.9);border-radius:8px;cursor:grab;color:var(--muted);font-size:16px;line-height:1;user-select:none;box-shadow:0 1px 4px rgba(0,0,0,.12)}
.drag-handle:active{cursor:grabbing}
.card-ghost{opacity:.5;transform:scale(.98)}
.card-ops{display:flex;gap:8px;padding:10px 14px;background:#fafbff;border-top:1px solid var(--line)}
.op-edit,.op-del{border:none;background:none;font-size:13px;cursor:pointer;padding:4px 8px;border-radius:8px;font-weight:600}
.op-edit{color:var(--brand)}
.op-del{color:#dc2626}
.op-edit:hover{background:rgba(79,70,229,.1)}
.op-del:hover{background:rgba(220,38,38,.1)}

/* 表单弹窗 */
.form-card{width:440px;max-width:94vw;padding:30px 30px 26px}
.form-card .modal-title{text-align:center;font-size:22px;margin-bottom:2px;color:var(--ink)}
.modal-sub{text-align:center;color:var(--muted);font-size:12.5px;margin:0 0 22px}
.modal-sub .req{color:#ef4444;font-weight:700}

#toolForm .field{margin-bottom:18px}
#toolForm .field > label{display:block;font-size:13px;font-weight:600;color:var(--ink);margin-bottom:7px}
#toolForm .field .req{color:#ef4444;font-weight:700;margin-left:2px}
#toolForm .field .opt{color:var(--muted);font-weight:400;font-size:12px;margin-left:3px}

#toolForm input[type=text],#toolForm textarea{
    width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;
    font-size:14px;font-family:inherit;color:var(--ink);background:#fbfcfe;outline:none;
    transition:border-color .15s, box-shadow .15s, background .15s;
}
#toolForm input::placeholder,#toolForm textarea::placeholder{color:#aab1c0}
#toolForm textarea{resize:vertical;min-height:80px;line-height:1.6}
#toolForm input:focus,#toolForm textarea:focus{border-color:var(--brand);background:#fff;box-shadow:0 0 0 4px rgba(79,70,229,.12)}

/* 自定义上传区 */
#toolForm .uploader{
    display:flex;align-items:center;gap:12px;padding:15px 16px;border:1.5px dashed #c7ccda;border-radius:12px;
    background:#fafbff;cursor:pointer;transition:border-color .15s, background .15s, color .15s;
    font-size:13px;color:var(--muted);
}
#toolForm .uploader:hover{border-color:var(--brand);background:#f3f4ff;color:var(--brand)}
#toolForm .uploader-icon{
    flex:0 0 34px;height:34px;border-radius:10px;background:var(--brand);color:#fff;
    display:flex;align-items:center;justify-content:center;font-size:15px;
}
#toolForm .uploader-text{font-weight:500}

/* 当前二维码预览 */
#toolForm .cur-img{display:flex;align-items:center;gap:14px;margin-top:12px;padding:12px 14px;background:#f7f8fc;border-radius:12px}
#toolForm .cur-img img{width:60px;height:60px;border-radius:10px;object-fit:cover;border:1px solid var(--line)}
#toolForm .cur-img-meta{display:flex;flex-direction:column;gap:7px;font-size:13px;color:var(--muted)}
#toolForm .chk{display:flex;align-items:center;gap:6px;color:var(--ink);font-size:13px;cursor:pointer}

/* 按钮 */
#toolForm .form-btns{display:flex;gap:12px;margin-top:24px}
#toolForm .form-btns .btn{flex:1;text-align:center;padding:12px;border-radius:12px;font-size:15px;font-weight:600}
#toolForm .btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 6px 18px rgba(79,70,229,.28)}
#toolForm .btn.primary:hover{filter:brightness(1.05);box-shadow:0 8px 22px rgba(79,70,229,.34)}
#toolForm .btn.ghost{background:#fff;color:var(--muted);border:1px solid var(--line)}
#toolForm .btn.ghost:hover{background:#f5f6fa;color:var(--ink)}