/* ===== 基础与配色（浅色 SaaS 卡片风，主色蓝） ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f3f5f9;
  --card: #ffffff;
  --border: #e5e9f0;
  --text: #1e293b;
  --text-2: #64748b;
  --text-3: #94a3b8;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --success: #16a34a;
  --success-soft: #f0fdf4;
  --warn: #d97706;
  --warn-soft: #fffbeb;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .04);
}
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}
.hidden { display: none !important; }
a { color: var(--primary); text-decoration: none; }

/* ===== 通用控件 ===== */
.input, .select, .textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 14px;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.input:focus, .select:focus, .textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, .12); }
.textarea { resize: vertical; min-height: 80px; }
.input-readonly { background: #f5f7fa; color: #64748b; line-height: 38px; padding: 0 12px; cursor: default; }
.label { display: block; font-size: 13px; color: var(--text-2); margin-bottom: 6px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid transparent; border-radius: 8px;
  padding: 8px 16px; font-size: 14px; cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
  background: #fff; color: var(--text); border-color: var(--border);
}
.btn:hover { border-color: #cbd5e1; background: #f8fafc; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { color: var(--danger); border-color: #fecaca; background: #fff; }
.btn-danger:hover { background: var(--danger-soft); border-color: var(--danger); }
.btn-ghost { border-color: transparent; background: transparent; color: var(--text-2); }
.btn-ghost:hover { background: #eef2f7; color: var(--text); }
.btn-sm { padding: 5px 10px; font-size: 13px; }
.btn-block { width: 100%; }
.btn-link { color: var(--primary); background: none; border: none; cursor: pointer; font-size: 13px; padding: 2px 4px; }
.btn-link:hover { text-decoration: underline; }
.btn-link.danger { color: var(--danger); }

/* ===== 登录页 ===== */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(180deg, #eef2f9 0%, #f3f5f9 100%); padding: 20px; }
.login-card {
  width: 380px; max-width: 100%; background: var(--card); border-radius: 16px;
  box-shadow: 0 10px 40px rgba(15, 23, 42, .08); padding: 36px 32px; text-align: center;
}
.login-logo {
  width: 64px; height: 64px; margin: 0 auto 16px; border-radius: 16px;
  background: var(--primary-soft); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.login-card h1 { font-size: 20px; margin-bottom: 4px; }
.login-sub { color: var(--text-3); font-size: 13px; margin-bottom: 22px; }
.login-card .input { margin-bottom: 12px; }
.login-err { color: var(--danger); font-size: 13px; min-height: 20px; margin-top: 10px; }
.login-tip { margin-top: 16px; font-size: 12px; color: var(--text-3); }
.login-tip code { background: #f1f5f9; padding: 1px 5px; border-radius: 4px; }

/* ===== 主布局 ===== */
.app { display: flex; height: 100vh; overflow: hidden; }
.sidebar {
  width: 216px; flex-shrink: 0; background: var(--card); border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 18px 18px 14px; font-weight: 600; font-size: 15px; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 8px; background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 700;
}
.nav { flex: 1; padding: 6px 10px; overflow-y: auto; }
.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 8px;
  color: var(--text-2); font-size: 14px; margin-bottom: 2px; transition: background .12s, color .12s;
}
.nav-item svg { flex-shrink: 0; }
.nav-item:hover { background: #f1f5f9; color: var(--text); }
.nav-item.active { background: var(--primary-soft); color: var(--primary); font-weight: 500; }
.sidebar-foot { padding: 14px 18px; font-size: 12px; color: var(--text-3); border-top: 1px solid var(--border); }
.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.topbar {
  height: 56px; flex-shrink: 0; background: var(--card); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; padding: 0 24px;
}
.topbar h2 { font-size: 16px; font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.topbar-user { color: var(--text-2); font-size: 13px; }
.view-container { flex: 1; overflow-y: auto; padding: 24px; }

/* ===== 卡片与表格 ===== */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.card + .card { margin-top: 16px; }
.card-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.card-head h3 { font-size: 14px; font-weight: 600; }
.card-body { padding: 18px; }
.card-foot { padding: 12px 18px; border-top: 1px solid var(--border); display: flex; align-items: center; gap: 8px; }

.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 13px; vertical-align: middle; }
.table th { color: var(--text-3); font-weight: 500; background: #fafbfd; font-size: 12px; white-space: nowrap; }
.table tbody tr:hover { background: #f8fafc; }
.table td .muted { color: var(--text-3); }
.table-wrap { overflow-x: auto; }
.row-actions { display: flex; gap: 4px; white-space: nowrap; }

/* 统计卡片 */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; }
.stat-card .num { font-size: 26px; font-weight: 700; margin-top: 4px; }
.stat-card .lbl { color: var(--text-2); font-size: 13px; }
.stat-card .icon { color: var(--text-3); }
.stat-card-clickable { cursor: pointer; transition: transform .15s, box-shadow .15s, border-color .15s; }
.stat-card-clickable:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(59, 130, 246, 0.15); border-color: var(--primary); }
.stat-card-clickable:hover .num { color: var(--primary); }

/* 标签 */
.tag { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: 6px; font-size: 12px; line-height: 1.6; }
.tag-blue { background: var(--primary-soft); color: var(--primary); }
.tag-green { background: var(--success-soft); color: var(--success); }
.tag-red { background: var(--danger-soft); color: var(--danger); }
.tag-gray { background: #f1f5f9; color: var(--text-2); }
.tag-amber { background: var(--warn-soft); color: var(--warn); }

/* 工具条 */
.toolbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.toolbar .grow { flex: 1; }
.spacer { flex: 1; }

/* 空态 / 说明 */
.empty { text-align: center; color: var(--text-3); padding: 36px 0; }
.empty .em { font-size: 30px; margin-bottom: 8px; }
.note { background: var(--warn-soft); border: 1px solid #fde68a; color: #92400e; border-radius: 8px; padding: 10px 14px; font-size: 13px; margin-bottom: 14px; }
.note.info { background: var(--primary-soft); border-color: #bfdbfe; color: #1e40af; }
.note.green { background: var(--success-soft); border-color: #bbf7d0; color: #166534; }

/* 分页 */
.pager { display: flex; align-items: center; gap: 10px; }
.pager .info { color: var(--text-3); font-size: 12px; }

/* 弹窗 */
.modal-mask { position: fixed; inset: 0; background: rgba(15, 23, 42, .45); z-index: 100; display: flex; align-items: flex-start; justify-content: center; padding: 60px 20px 20px; overflow-y: auto; }
.modal { width: 560px; max-width: 100%; background: var(--card); border-radius: 14px; box-shadow: 0 20px 60px rgba(15, 23, 42, .2); }
.modal.wide { width: 820px; }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.modal-head h3 { font-size: 15px; font-weight: 600; }
.modal-close { background: none; border: none; font-size: 20px; color: var(--text-3); cursor: pointer; line-height: 1; }
.modal-close:hover { color: var(--text); }
.modal-body { padding: 20px; max-height: 70vh; overflow-y: auto; }
.modal-foot { display: flex; justify-content: flex-end; gap: 10px; padding: 14px 20px; border-top: 1px solid var(--border); }
.form-row { margin-bottom: 14px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.form-grid .full { grid-column: 1 / -1; }

/* Toast */
#toast-root { position: fixed; top: 20px; left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; align-items: center; }
.toast { background: #1e293b; color: #fff; border-radius: 8px; padding: 9px 16px; font-size: 13px; box-shadow: 0 6px 20px rgba(15, 23, 42, .25); animation: toast-in .18s ease; }
.toast.err { background: var(--danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

/* 题目列表内嵌 */
.q-item { padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 10px; background: #fff; }
.q-item-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.q-item-content { font-size: 13px; }
.q-item-meta { display: flex; gap: 6px; align-items: center; margin-top: 8px; flex-wrap: wrap; }
.q-item .answer { color: var(--success); }
.q-item .analysis { color: var(--text-3); font-size: 12px; margin-top: 6px; white-space: pre-wrap; }

.loading { text-align: center; color: var(--text-3); padding: 30px 0; }
.spin { display: inline-block; width: 16px; height: 16px; border: 2px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .7s linear infinite; vertical-align: -3px; margin-right: 6px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 后台升级：登录双通道 + 角色导航 ===== */
.login-tabs { display: flex; gap: 6px; background: #f1f5f9; border-radius: 8px; padding: 4px; margin-bottom: 16px; }
.tab-btn { flex: 1; border: 0; background: transparent; padding: 8px 0; border-radius: 6px; font-size: 13px; color: var(--text-2); cursor: pointer; }
.tab-btn.active { background: #fff; color: var(--primary); font-weight: 500; box-shadow: 0 1px 4px rgba(15,23,42,.08); }
.scan-qr { width: 220px; height: 220px; margin: 0 auto 12px; border: 1px dashed var(--border); border-radius: 12px; display: flex; align-items: center; justify-content: center; background: #fff; overflow: hidden; }
.scan-qr img { width: 100%; height: 100%; object-fit: contain; display: block; }
.scan-qr-loading { color: var(--text-3); font-size: 13px; }
.scan-qr-err { color: var(--danger); font-size: 13px; text-align: center; padding: 0 12px; }
.user-only { display: none; }
.hide-admin .admin-only { display: none; }
.hide-admin .user-only { display: flex; }

/* 题库名称输入：内容居中，占位提醒文字靠左 */
#bk-title::placeholder {
  text-align: left;
}

/* ===== 接龙 v2 新增样式 ===== */

/* CSS Toggle 开关 */
.sg-toggle-row { display: flex; align-items: center; justify-content: space-between; padding: 8px 0; }
.sg-toggle-label { font-size: 13px; color: var(--text); }
.sg-toggle { position: relative; display: inline-block; width: 44px; height: 24px; flex-shrink: 0; }
.sg-toggle input { opacity: 0; width: 0; height: 0; }
.sg-toggle-slider {
  position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0;
  background-color: #cbd5e1; transition: .2s; border-radius: 24px;
}
.sg-toggle-slider:before {
  position: absolute; content: ""; height: 18px; width: 18px; left: 3px; bottom: 3px;
  background-color: #fff; transition: .2s; border-radius: 50%; box-shadow: 0 1px 3px rgba(0,0,0,.2);
}
.sg-toggle input:checked + .sg-toggle-slider { background-color: var(--primary); }
.sg-toggle input:checked + .sg-toggle-slider:before { transform: translateX(20px); }

/* 接龙选项框 */
.sg-options-box { background: #f8fafc; border: 1px solid var(--border); border-radius: 8px; padding: 6px 14px; }

/* 封面上传 */
.sg-upload-area { cursor: pointer; }
.sg-cover-placeholder {
  width: 100%; height: 140px; border: 2px dashed var(--border); border-radius: 10px;
  display: flex; align-items: center; justify-content: center; color: var(--text-3);
  font-size: 14px; background: #f8fafc; transition: border-color .15s;
}
.sg-cover-placeholder:hover { border-color: var(--primary); color: var(--primary); }
.sg-cover-preview { width: 100%; max-height: 200px; object-fit: cover; border-radius: 10px; }

/* 说明图片 */
.sg-descimgs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.sg-descimg-item { position: relative; width: 80px; height: 80px; border-radius: 8px; overflow: hidden; }
.sg-descimg-item img { width: 100%; height: 100%; object-fit: cover; }
.sg-descimg-del {
  position: absolute; top: 2px; right: 2px; width: 20px; height: 20px;
  background: rgba(0,0,0,.5); color: #fff; border-radius: 50%; display: flex;
  align-items: center; justify-content: center; font-size: 14px; cursor: pointer; line-height: 1;
}
.sg-descimg-add {
  width: 80px; height: 80px; border: 2px dashed var(--border); border-radius: 8px;
  display: flex; align-items: center; justify-content: center; color: var(--text-3);
  font-size: 24px; cursor: pointer; background: #f8fafc;
}
.sg-descimg-add:hover { border-color: var(--primary); color: var(--primary); }

/* 协议文字 */
.sg-agreement { font-size: 12px; color: var(--text-3); text-align: center; margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--border); }
.sg-agree-link { color: var(--primary); cursor: pointer; }
.sg-agree-link:hover { text-decoration: underline; }

/* 创建弹窗滚动区 */
.sg-create-scroll { max-height: 65vh; overflow-y: auto; padding-right: 4px; }

/* 接龙详情封面 */
.sg-detail-cover { width: 100%; max-height: 240px; object-fit: cover; border-radius: 10px; margin-bottom: 14px; }
.sg-detail-title { font-size: 18px; font-weight: 700; margin-bottom: 12px; color: var(--text); }

/* 活动信息横向滚动卡片 */
.sg-act-scroll { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 8px; margin-bottom: 14px; }
.sg-act-card {
  flex-shrink: 0; display: flex; align-items: center; gap: 8px;
  background: var(--primary-soft); border: 1px solid #bfdbfe; border-radius: 10px;
  padding: 10px 14px; min-width: 180px;
}
.sg-act-icon { font-size: 18px; }
.sg-act-text { font-size: 13px; color: #1e40af; font-weight: 500; white-space: nowrap; }

/* 创建者信息 */
.sg-detail-creator { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; padding: 10px 14px; background: #f8fafc; border-radius: 8px; }
.sg-creator-avatar {
  width: 36px; height: 36px; border-radius: 50%; background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 600;
}
.sg-creator-name { font-size: 14px; font-weight: 600; color: var(--text); }
.sg-creator-time { font-size: 12px; color: var(--text-3); margin-left: auto; }

/* 接龙说明 */
.sg-detail-desc { margin-bottom: 16px; }
.sg-desc-label { font-size: 13px; font-weight: 600; color: var(--text-2); margin-bottom: 6px; }
.sg-desc-text { font-size: 13px; color: var(--text); line-height: 1.7; white-space: pre-wrap; }
.sg-detail-descimgs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.sg-detail-descimg { width: 120px; height: 120px; object-fit: cover; border-radius: 8px; cursor: pointer; }

/* 报名名单区 */
.sg-detail-reglist { margin-top: 8px; }
.sg-reglist-title { font-size: 14px; font-weight: 600; margin-bottom: 10px; color: var(--text); }

/* 列表封面缩略图 */
.sg-list-cover { width: 40px; height: 40px; object-fit: cover; border-radius: 6px; flex-shrink: 0; }

/* 普通用户接龙 Tab */
.sg-tabs { display: flex; gap: 0; margin-bottom: 14px; border-bottom: 2px solid var(--border); }
.sg-tab {
  padding: 8px 20px; border: none; background: none; font-size: 14px; color: var(--text-2);
  cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -2px; transition: color .15s, border-color .15s;
}
.sg-tab:hover { color: var(--text); }
.sg-tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }

/* ===================== 题库创建弹窗 ===================== */
.bk-create-scroll { max-height: 65vh; overflow-y: auto; padding-right: 4px; }
.bk-cat-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.bk-cat-item {
  padding: 6px 16px; border: 1px solid var(--border); border-radius: 20px; font-size: 13px;
  color: var(--text-2); cursor: pointer; transition: all .15s; background: #fff;
}
.bk-cat-item:hover { border-color: var(--primary); color: var(--primary); }
.bk-cat-item.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.bk-color-row { display: flex; gap: 12px; align-items: center; }
.bk-color-dot {
  width: 32px; height: 32px; border-radius: 50%; cursor: pointer;
  border: 3px solid transparent; transition: border-color .15s; box-shadow: 0 1px 4px rgba(0,0,0,.15);
}
.bk-color-dot:hover { transform: scale(1.1); }
.bk-color-dot.active { border-color: #fff; outline: 2px solid var(--primary); }
.bk-exam-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.bk-exam-item { display: flex; flex-direction: column; gap: 4px; }
.bk-exam-label { font-size: 12px; color: var(--text-2); }
.bk-exam-input { width: 100%; }
.bk-exam-tip { font-size: 12px; color: var(--text-3); margin-top: 6px; }
.bk-exam-tip strong { color: var(--primary); }

/* 封面图片上传 */
.bk-cover-upload { margin-top: 4px; }
.bk-cover-btn {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  width: 100%; height: 120px; border: 2px dashed var(--border); border-radius: 10px;
  background: #f8fafc; cursor: pointer; gap: 6px; color: var(--text-3); font-size: 13px;
  transition: border-color .15s;
}
.bk-cover-btn:hover { border-color: var(--primary); color: var(--primary); }
.bk-cover-icon { font-size: 28px; line-height: 1; }
.bk-cover-preview { position: relative; width: 100%; height: 120px; border-radius: 10px; overflow: hidden; }
.bk-cover-preview img { width: 100%; height: 100%; object-fit: cover; }
.bk-cover-del {
  position: absolute; top: 8px; right: 8px; width: 28px; height: 28px;
  background: rgba(0,0,0,.5); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 18px; line-height: 1;
}
.bk-cover-tip { font-size: 12px; color: var(--text-3); margin-top: 6px; }

/* 题库批量导入 */
.bk-import-card { border: 1px solid var(--border); border-radius: 10px; margin-top: 4px; overflow: hidden; }
.bk-import-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px; background: #f8fafc; font-size: 13px; font-weight: 600;
  color: var(--text); cursor: pointer; user-select: none;
}
.bk-import-head:hover { background: #f1f5f9; }
.bk-import-body { padding: 12px 14px; border-top: 1px solid var(--border); }
.bk-import-tabs { display: flex; gap: 0; margin-bottom: 12px; border-bottom: 2px solid var(--border); }
.bk-import-tab {
  padding: 6px 16px; border: none; background: none; font-size: 13px; color: var(--text-2);
  cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -2px;
}
.bk-import-tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.bk-import-tip { font-size: 12px; color: var(--text-3); margin: 8px 0; line-height: 1.6; }
.bk-file-name { font-size: 12px; color: #16a34a; margin-top: 8px; }

/* 已收录题目列表 */
.bk-imported-list { margin-top: 12px; border: 1px solid #e5eaf2; border-radius: 8px; overflow: hidden; }
.bk-imported-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 12px; background: #f0fdf4; font-size: 12px; font-weight: 600; color: #166534;
}
.bk-imported-clear { color: #dc2626; cursor: pointer; font-weight: 400; }
.bk-imported-clear:hover { text-decoration: underline; }
.bk-imported-items { max-height: 180px; overflow-y: auto; }
.bk-imported-item {
  display: flex; gap: 6px; padding: 6px 12px; border-bottom: 1px solid #f1f5f9;
  font-size: 12px; line-height: 1.5; align-items: flex-start;
}
.bk-imported-no { color: var(--text-3); min-width: 24px; flex-shrink: 0; }
.bk-imported-type {
  color: var(--primary); font-weight: 600; min-width: 36px; flex-shrink: 0;
}
.bk-imported-content { color: var(--text); flex: 1; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }

/* ===================== 接龙字段类型选择器 ===================== */
.sg-type-btn {
  background: #fff; border: 1px solid var(--border); color: var(--text);
  font-size: 13px; cursor: pointer; border-radius: 6px; padding: 0 10px;
}
.sg-type-btn:hover { border-color: var(--primary); color: var(--primary); }
.sg-type-picker {
  position: fixed; z-index: 10000; background: #fff; border: 1px solid var(--border);
  border-radius: 10px; box-shadow: 0 8px 30px rgba(0,0,0,.15); padding: 12px;
  width: 360px; max-height: 400px; overflow-y: auto;
}
.sg-type-picker-title { font-size: 13px; font-weight: 600; color: var(--text-2); margin-bottom: 10px; }
.sg-type-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.sg-type-item {
  padding: 8px 6px; text-align: center; font-size: 12px; border: 1px solid var(--border);
  border-radius: 6px; cursor: pointer; color: var(--text-2); transition: all .15s; background: #fff;
}
.sg-type-item:hover { border-color: var(--primary); color: var(--primary); background: #eff6ff; }
.sg-type-item.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 添加字段按钮 */
.sg-addfield-btn {
  display: block; width: 100%; padding: 10px; margin-top: 8px;
  border: 2px dashed var(--border); border-radius: 8px; background: #fafbfc;
  color: var(--text-2); font-size: 13px; cursor: pointer; transition: all .15s;
}
.sg-addfield-btn:hover { border-color: var(--primary); color: var(--primary); background: #eff6ff; }

/* 字段行布局 */
.sg-field-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  margin-bottom: 8px;
}
.sg-field-main {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: nowrap;
}
.sg-drag-handle {
  cursor: grab;
  flex-shrink: 0;
  width: 20px;
  text-align: center;
  color: #9ca3af;
  font-size: 16px;
  line-height: 36px;
  user-select: none;
}
.sg-drag-handle:hover { color: var(--primary); }
.sg-drag-handle:active { cursor: grabbing; }
.sg-field-row.sg-dragging {
  opacity: 0.5;
  transform: scale(0.98);
  box-shadow: 0 8px 24px rgba(91, 141, 239, 0.25);
  border-color: var(--primary) !important;
  border-width: 2px !important;
  z-index: 10;
}
.sg-field-row.sg-drop-before {
  border-top: 3px solid var(--primary) !important;
  margin-top: -1px;
}
.sg-field-row.sg-drop-after {
  border-bottom: 3px solid var(--primary) !important;
  margin-bottom: -1px;
}
.sg-drag-active .sg-field-row:not(.sg-dragging) {
  transition: transform 0.15s ease;
}
.sg-field-name {
  width: 200px;
  height: 36px;
  flex-shrink: 0;
}
.sg-type-btn {
  height: 36px;
  min-width: 110px;
  flex-shrink: 0;
}
.sg-field-req {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  height: 36px;
  flex-shrink: 0;
  white-space: nowrap;
}
.sg-field-del {
  height: 34px;
  flex-shrink: 0;
  margin-left: auto;
}
.sg-field-sub {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 28px;
}
.sg-field-sub-label {
  font-size: 12px;
  color: var(--text-2);
  flex-shrink: 0;
  width: 50px;
}
.sg-options {
  flex: 1;
  min-height: 34px;
  max-height: 120px;
  resize: vertical;
  line-height: 1.5;
  padding: 7px 10px;
}
.sg-if-row {
  background: #fff5f5;
  border: 1px solid #fca5a5;
  border-radius: 6px;
  padding: 6px 8px;
  margin-left: 28px;
}
.sg-if-label {
  color: #dc2626;
  font-weight: 600;
  width: auto;
}
.sg-if-row select {
  width: 140px;
  height: 32px;
}
.sg-if-row input {
  flex: 1;
  height: 32px;
  max-width: 200px;
}

/* ===== 活动地点选点 ===== */
.loc-input-wrap {
  display: flex;
  gap: 8px;
}
.loc-input-wrap .input {
  flex: 1;
}
.btn-loc-pick {
  flex-shrink: 0;
  padding: 0 16px;
  height: 38px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  background: #f8fafc;
  color: #1e40af;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
}
.btn-loc-pick:hover {
  background: #eff6ff;
  border-color: #93c5fd;
}

/* 地图选点弹窗 */
.loc-picker-mask {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15, 23, 42, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}
.loc-picker-box {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  overflow: hidden;
}
.loc-picker-box .modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid #e5eaf2;
  font-size: 16px;
  font-weight: 600;
  color: #1f2937;
}
.loc-picker-box .modal-close {
  font-size: 24px;
  color: #94a3b8;
  cursor: pointer;
  line-height: 1;
}
.loc-picker-body {
  padding: 16px 20px 20px;
}
.loc-search-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.loc-search-input {
  flex: 1;
  height: 38px;
}
.loc-search-btn {
  flex-shrink: 0;
  height: 38px;
  padding: 0 20px;
}
.loc-results {
  max-height: 280px;
  overflow-y: auto;
  border: 1px solid #e5eaf2;
  border-radius: 8px;
  margin-bottom: 12px;
  background: #f8fafc;
}
.loc-results-empty {
  padding: 24px;
  text-align: center;
  color: #94a3b8;
  font-size: 13px;
}
.loc-result-item {
  padding: 10px 14px;
  border-bottom: 1px solid #eef2f7;
  cursor: pointer;
  transition: background 0.15s;
}
.loc-result-item:last-child {
  border-bottom: none;
}
.loc-result-item:hover {
  background: #eff6ff;
}
.loc-result-name {
  font-size: 14px;
  font-weight: 600;
  color: #1f2937;
  margin-bottom: 2px;
}
.loc-result-addr {
  font-size: 12px;
  color: #64748b;
  line-height: 1.5;
}
.loc-manual-row {
  display: flex;
  gap: 8px;
}
.loc-manual-input {
  flex: 1;
  height: 38px;
}
.loc-manual-confirm {
  flex-shrink: 0;
  height: 38px;
  padding: 0 20px;
}


/* ===== 二维码分享弹窗 ===== */
.qrcode-mask {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15, 23, 42, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}
.qrcode-box {
  width: 360px;
  max-width: 90vw;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
  overflow: hidden;
}
.qrcode-box .modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid #e5eaf2;
  font-size: 15px;
  font-weight: 600;
  color: #1f2937;
}
.qrcode-box .modal-close {
  font-size: 24px;
  color: #94a3b8;
  cursor: pointer;
  line-height: 1;
}
.qrcode-body {
  padding: 24px 20px 20px;
  text-align: center;
}
.qrcode-loading {
  padding: 40px 0;
  color: #64748b;
  font-size: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.qrcode-img {
  width: 240px;
  height: 240px;
  border-radius: 12px;
  border: 1px solid #e5eaf2;
  margin: 0 auto 12px;
  display: block;
}
.qrcode-tip {
  font-size: 13px;
  color: #64748b;
  margin-bottom: 16px;
}
.qrcode-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}
.qrcode-actions .btn {
  min-width: 100px;
}
.hidden { display: none !important; }


/* 接龙列表标题可点击 */
.sg-title-link {
  color: #1e40af;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s;
}
.sg-title-link:hover {
  color: #3b82f6;
  text-decoration: underline;
}

/* 开关组件 */
.switch-wrap { display: inline-flex; align-items: center; gap: 10px; cursor: pointer; }
.switch-wrap input { opacity: 0; width: 0; height: 0; position: absolute; }
.switch-slider { position: relative; display: inline-block; width: 44px; height: 24px; background-color: #cbd5e1; border-radius: 24px; transition: 0.3s; flex-shrink: 0; }
.switch-slider:before { content: ''; position: absolute; height: 18px; width: 18px; left: 3px; bottom: 3px; background-color: white; border-radius: 50%; transition: 0.3s; }
.switch-wrap input:checked + .switch-slider { background-color: #3b82f6; }
.switch-wrap input:checked + .switch-slider:before { transform: translateX(20px); }
.switch-text { font-size: 13px; color: #64748b; }
.form-hint { font-size: 12px; color: #94a3b8; margin-top: 4px; }

/* ===== 暗黑模式（跟随系统） ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --card: #1e293b;
    --border: #334155;
    --text: #e2e8f0;
    --text-2: #94a3b8;
    --text-3: #64748b;
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-soft: rgba(59, 130, 246, 0.15);
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.15);
    --success: #4ade80;
    --success-soft: rgba(74, 222, 128, 0.15);
    --warn: #fbbf24;
    --warn-soft: rgba(251, 191, 36, 0.15);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  }
  body { background: var(--bg); color: var(--text); }
  .input, .select, .textarea {
    background: #0f172a;
    color: var(--text);
    border-color: var(--border);
  }
  .input-readonly { background: #0f172a !important; color: #94a3b8 !important; }
  .input:focus, .select:focus, .textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
  }
  .card { background: var(--card); border-color: var(--border); box-shadow: var(--shadow); }
  .card-head { border-bottom-color: var(--border); }
  .card-head h3 { color: var(--text); }
  .modal-content { background: var(--card); border-color: var(--border); }
  .modal-head { border-bottom-color: var(--border); color: var(--text); }
  .modal-body { color: var(--text); }
  .nav-item { color: var(--text-2); }
  .nav-item:hover { background: var(--primary-soft); color: var(--primary); }
  .nav-item.active { background: var(--primary-soft); color: var(--primary); }
  .sidebar { background: var(--card); border-right-color: var(--border); }
  .topbar { background: var(--card); border-bottom-color: var(--border); }
  .topbar-title { color: var(--text); }
  .user-info { color: var(--text-2); }
  .table th { background: #0f172a; color: var(--text-2); border-color: var(--border); }
  .table td { border-color: var(--border); color: var(--text); }
  .table tr:hover { background: rgba(59, 130, 246, 0.06); }
  .btn-secondary { background: #334155; color: var(--text); border-color: var(--border); }
  .btn-secondary:hover { background: #475569; }
  .btn-danger { background: var(--danger); }
  .note { background: var(--primary-soft); color: var(--text-2); border-color: var(--border); }
  .note.info { background: var(--primary-soft); color: #93c5fd; }
  .empty { color: var(--text-3); }
  .muted { color: var(--text-3); }
  .info { color: var(--text-2); }
  .tag { background: var(--primary-soft); color: var(--primary); }
  .tag.success { background: var(--success-soft); color: var(--success); }
  .tag.warn { background: var(--warn-soft); color: var(--warn); }
  .tag.danger { background: var(--danger-soft); color: var(--danger); }
  .form-hint { color: var(--text-3); }
  .switch-slider { background-color: #475569; }
  .switch-slider:before { background-color: #e2e8f0; }
  .sg-toggle-slider { background-color: #475569; }
  .sg-toggle-slider:before { background-color: #e2e8f0; }
  .login-card { background: var(--card); box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4); }
  .login-title { color: var(--text); }
  .login-sub { color: var(--text-2); }
  .scan-box { background: #0f172a; border-color: var(--border); }
  .code-input { background: #0f172a; color: var(--text); border-color: var(--border); }
  .stat-card { background: var(--card); border-color: var(--border); }
  .stat-value { color: var(--text); }
  .stat-label { color: var(--text-2); }
  .bk-import-body { border-top-color: var(--border); }
  .loc-picker-body { background: var(--card); border-color: var(--border); }
  /* 地点选择弹窗暗黑模式 */
  .loc-picker-box { background: var(--card) !important; border-color: var(--border) !important; }
  .loc-picker-box .modal-header { background: var(--card); border-bottom-color: var(--border); color: var(--text); }
  .loc-picker-box .modal-close { color: var(--text-3); }
  .loc-picker-box .modal-close:hover { color: var(--text); }
  .loc-search-input, .loc-manual-input { background: #0f172a !important; color: var(--text) !important; border-color: var(--border) !important; }
  .loc-search-input::placeholder, .loc-manual-input::placeholder { color: var(--text-3) !important; }
  .loc-results { background: #0f172a !important; border-color: var(--border) !important; }
  .loc-results-empty { color: var(--text-3); }
  .loc-result-item { border-bottom-color: var(--border); }
  .loc-result-item:hover { background: #1e293b; }
  .loc-result-name { color: var(--text); }
  .loc-result-addr { color: var(--text-2); }
  .qrcode-body { background: var(--card); border-color: var(--border); }
  .field-item { background: #0f172a; border-color: var(--border); }
  .field-name-input, .field-options-input { background: #0f172a; color: var(--text); border-color: var(--border); }
  .field-label { color: var(--text-2); }
  .fields-tip { color: var(--text-3); }
  .cond-tip { color: var(--text-3); }
  .cond-highlight { color: #f87171; background: rgba(248, 113, 113, 0.15); }
  .picker-panel { background: var(--card); }
  .picker-title { color: var(--text); }
  .picker-name { color: var(--text-2); }
  .draft-btn { background: linear-gradient(135deg, #7cb0ff 0%, #5b8def 50%, #4a7ad4 100%); color: #fff; }
  .save-bar { background: linear-gradient(180deg, rgba(30, 41, 59, 0) 0%, rgba(30, 41, 59, 0.95) 30%, #1e293b 100%); }
  .agreement-text { color: var(--text-3); }
  .cover-upload-box { background: #0f172a; border-color: var(--border); }
  .cover-upload-text { color: var(--text-3); }
  .color-dot { border-color: var(--border); }
  .category-chip { background: #0f172a; color: var(--text-2); border-color: var(--border); }
  .category-chip.active { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }
  .question-preview-item { background: #0f172a; border-color: var(--border); }
  .question-type-tag { background: var(--primary-soft); color: var(--primary); }
  .import-stats { color: var(--text-2); }
  .toast { background: var(--card); color: var(--text); border-color: var(--border); box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4); }
  /* 编辑接龙弹窗暗黑模式 */
  .sg-field-row { background: #0f172a; border-color: var(--border); }
  .sg-field-row input[type="text"], .sg-field-row input:not([type]), .sg-field-row textarea, .sg-field-row select {
    background: #1e293b !important; color: var(--text) !important; border-color: var(--border) !important;
  }
  .sg-field-row input::placeholder, .sg-field-row textarea::placeholder { color: var(--text-3) !important; }
  .sg-field-req { color: var(--text-2); }
  .sg-type-btn { background: #1e293b; color: var(--text); border-color: var(--border); }
  .sg-type-btn:hover { background: #334155; border-color: var(--primary); color: var(--primary); }
  .sg-options { background: #1e293b; color: var(--text); border-color: var(--border); }
  .sg-options::placeholder { color: var(--text-3); }
  .sg-addfield-btn { background: #1e293b; color: var(--text-2); border-color: var(--border); }
  .sg-addfield-btn:hover { background: #334155; border-color: var(--primary); color: var(--primary); }
  .sg-drag-handle { color: #64748b; }
  .sg-drag-handle:hover { color: #93c5fd; }
  .sg-field-row.sg-dragging { box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4); border-color: #3b82f6 !important; }
  .sg-field-row.sg-drop-before { border-top-color: #3b82f6 !important; }
  .sg-field-row.sg-drop-after { border-bottom-color: #3b82f6 !important; }

  .sg-options-box { background: #0f172a !important; border-color: var(--border) !important; }
  .sg-upload-area { background: #0f172a; border-color: var(--border); }
  .sg-cover-placeholder { color: var(--text-3); }
  .sg-descimg-item { background: #0f172a; border-color: var(--border); }
  .sg-descimg-add { background: #0f172a; color: var(--text-3); border-color: var(--border); }
  .sg-descimg-add:hover { background: #1e293b; border-color: var(--primary); color: var(--primary); }
  .sg-type-picker { background: var(--card); border-color: var(--border); box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5); }
  .sg-type-item { background: #0f172a; color: var(--text-2); border-color: var(--border); }
  .sg-type-item:hover { background: #1e293b; border-color: var(--primary); color: var(--primary); }
  .sg-type-item.active { background: var(--primary); color: #fff; border-color: var(--primary); }
  .sg-agreement { color: var(--text-3); }
  .sg-agree-link { color: var(--primary); }
  .loc-input-wrap .input { background: #0f172a; color: var(--text); border-color: var(--border); }
  .btn-loc-pick { background: #1e293b; color: var(--text-2); border-color: var(--border); }
  .btn-loc-pick:hover { background: #334155; border-color: var(--primary); color: var(--primary); }
  .loading { color: var(--text-2); }
  .spin { border-color: var(--border); border-top-color: var(--primary); }
  pre, code { background: #0f172a; color: #93c5fd; }
  hr { border-color: var(--border); }
  /* 通用按钮 */
  .btn { background: #1e293b; color: var(--text); border-color: var(--border); }
  .btn:hover { background: #334155; border-color: #475569; }
  .btn-danger { background: #1e293b; border-color: rgba(248, 113, 113, 0.3); }
  .btn-danger:hover { background: var(--danger-soft); border-color: var(--danger); }
  .btn-ghost:hover { background: rgba(59, 130, 246, 0.1); color: var(--text); }
  /* 登录页：背景更深，与卡片形成对比 */
  .login-wrap { background: linear-gradient(160deg, #020617 0%, #0f172a 40%, #1e293b 100%) !important; }
  .login-card {
    background: rgba(30, 41, 59, 0.85) !important;
    backdrop-filter: blur(24px) !important;
    -webkit-backdrop-filter: blur(24px) !important;
    border: 1px solid rgba(148, 163, 184, 0.2) !important;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(59, 130, 246, 0.08) !important;
  }
  .login-tip code { background: #0f172a; color: #93c5fd; }
  /* 登录tab切换 */
  .login-tabs { background: #0f172a !important; }
  .tab-btn { color: #94a3b8 !important; }
  .tab-btn.active { background: #1e293b !important; color: #60a5fa !important; box-shadow: 0 2px 8px rgba(0,0,0,0.3) !important; }
  /* 二维码区域保留白底（扫码需要），但加深边框 */
  .scan-qr { background: #fff !important; border-color: #334155 !important; }
  /* 表格行 hover 加深（用高优先级选择器覆盖浅色） */
  .table tbody tr:hover { background: rgba(59, 130, 246, 0.12) !important; }
  .table th { background: #0f172a !important; }
  /* 分页区域 */
  .pagination { color: var(--text-2); }
  /* 概览页设置显示行 */
  .setting-row { border-color: var(--border); }
  .setting-row .setting-value { color: var(--text); }
  /* 搜索框 */
  .search-box input { background: #0f172a; color: var(--text); border-color: var(--border); }
  /* 链接按钮 */
  .btn-link { color: #60a5fa; }
  /* 统计卡片 */
  .stat-card .num { color: var(--text); }
  .stat-card .lbl { color: var(--text-2); }
  .stat-card .icon { color: var(--text-3); }
  /* 卡片body */
  .card-body { color: var(--text); }
  /* 表单标签 */
  .label { color: var(--text-2); }
  .form-row label { color: var(--text-2); }
  /* 分页 */
  .pagination-info { color: var(--text-3); }
  /* 搜索框容器 */
  .toolbar { background: transparent; }
  /* 空状态 */
  .empty-state { color: var(--text-3); }
  /* 模态框底部 */
  .modal-foot { border-top-color: var(--border); }
  /* 关闭按钮 */
  .modal-close { color: var(--text-3); }
  .modal-close:hover { color: var(--text); background: var(--primary-soft); }
  /* 下拉选择 */
  select { background: #0f172a; color: var(--text); border-color: var(--border); }
  /* 滚动条 */
  ::-webkit-scrollbar-track { background: #0f172a; }
  ::-webkit-scrollbar-thumb { background: #334155; }
  ::-webkit-scrollbar-thumb:hover { background: #475569; }
}


/* ===== 地图选点弹窗 ===== */
.loc-selected-info { background: #f8fafc; border: 1px solid #e5eaf2; }
.loc-selected-addr { word-break: break-all; }
.loc-tip { color: #94a3b8; }

/* 暗黑模式：地图选点弹窗 */
@media (prefers-color-scheme: dark) {
  .loc-selected-info { background: #0f172a !important; border-color: var(--border) !important; }
  .loc-selected-addr { color: var(--text) !important; }
  .loc-tip { color: var(--text-3) !important; }
  .leaflet-container { background: #0f172a; }
  .leaflet-popup-content-wrapper { background: var(--card); color: var(--text); }
  .leaflet-popup-tip { background: var(--card); }
}