:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --primary: #5b8def;
  --primary-dark: #3f6fd1;
  --accent: #ff9a76;
  --text: #2b3245;
  --muted: #8a93a6;
  --line: #e6ebf2;
  --student: #eaf1ff;
  --teacher: #fff3ea;
  --ok: #3fae6b;
  --warn: #e8a33d;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 24px 16px 60px; }
.admin-wrap { max-width: 1080px; }
header.top {
  text-align: center;
  padding: 22px 0 8px;
}
header.top h1 { margin: 0; font-size: 24px; letter-spacing: 1px; }
header.top p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  margin-top: 18px;
  box-shadow: 0 4px 18px rgba(40, 60, 110, 0.05);
}
.tabs { display: flex; gap: 8px; margin: 18px 0 0; }
.tabs button {
  flex: 1; padding: 12px; border: 1px solid var(--line); background: #fff;
  border-radius: 10px; cursor: pointer; font-size: 15px; color: var(--muted);
}
.tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }

label { display: block; font-size: 14px; margin: 14px 0 6px; color: #44506a; }
input, select, textarea {
  width: 100%; padding: 11px 12px; border: 1px solid var(--line);
  border-radius: 10px; font-size: 15px; font-family: inherit; color: var(--text);
  background: #fff;
}
textarea { resize: vertical; min-height: 120px; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); }

.btn {
  display: inline-block; padding: 12px 20px; border: none; border-radius: 10px;
  background: var(--primary); color: #fff; font-size: 15px; cursor: pointer;
  transition: background .15s;
}
.btn:hover { background: var(--primary-dark); }
.btn.ghost { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.btn.sm { padding: 7px 14px; font-size: 13px; }
.btn.warn { background: var(--warn); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn:disabled:hover { background: var(--primary); }
.btn.warn:disabled:hover { background: var(--warn); }
code { background: #eef2f8; padding: 1px 5px; border-radius: 4px; font-size: 12px; color: #4a5568; }

.msg { margin-top: 14px; padding: 12px; border-radius: 10px; font-size: 14px; }
.msg.ok { background: #eafaf0; color: #2c7a4b; }
.msg.err { background: #fdeaea; color: #b23b3b; }

.code-box {
  background: #fff8f1; border: 1px dashed var(--accent); border-radius: 12px;
  padding: 16px; text-align: center; margin-top: 14px;
}
.code-box .code { font-size: 30px; letter-spacing: 6px; font-weight: 700; color: var(--accent); }

/* 对话气泡 */
.thread { margin-top: 10px; }
.bubble {
  max-width: 82%; padding: 11px 14px; border-radius: 14px; margin: 10px 0;
  font-size: 15px; white-space: pre-wrap; word-break: break-word;
}
.bubble .who { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.bubble .time { font-size: 11px; color: var(--muted); margin-top: 6px; text-align: right; }
.b-student { background: var(--student); margin-right: auto; border-top-left-radius: 4px; }
.b-teacher { background: var(--teacher); margin-left: auto; border-top-right-radius: 4px; text-align: left; }

/* 教师后台 */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(132px, 1fr)); gap: 12px; margin-top: 16px; }
.stat { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px; text-align: center; }
.stat .n { font-size: 26px; font-weight: 700; color: var(--primary); }
.stat .l { font-size: 13px; color: var(--muted); }
.stat.alert-red { background: #fff5f5; border-color: #f3c2c2; }
.stat.alert-red .n { color: #d64545; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.filters label { margin: 0; }
.filters > div { flex: 1; min-width: 140px; }
.filters input, .filters select { margin-top: 4px; }

table { width: 100%; border-collapse: collapse; margin-top: 14px; font-size: 14px; }
th, td { padding: 10px 8px; border-bottom: 1px solid var(--line); text-align: left; }
th { color: var(--muted); font-weight: 600; background: #fafbfe; }
tr:hover td { background: #f7faff; }
.tag { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: 12px; }
.tag.pending { background: #fff3da; color: #b9802a; }
.tag.replied { background: #e6f7ee; color: #2c8a56; }
.tag.risk-high { background: #fde8e8; color: #c0392b; font-weight: 600; }
.tag.risk-mid { background: #fff4dc; color: #b9802a; }
/* 归属标记：locked = 他班（心理老师只读）；free = 未绑定（可直接维护） */
.tag.locked { background: #eef1f5; color: #5b6b7f; }
.tag.free { background: #e6f0fb; color: #2b6cb0; }

/* 高危提示条 */
.risk-banner {
  margin-top: 12px; padding: 12px 14px; border-radius: 12px; font-size: 14px;
  border: 1px solid #f3c2c2; background: #fff5f5; color: #a93226;
}
.risk-banner.high { border-color: #e88b8b; background: #ffecec; }
.risk-banner.mid { border-color: #f0d9a8; background: #fffaf0; color: #9c6f1f; }
.risk-banner .tip { color: inherit; opacity: .8; }

/* 复选框不受全局 input 宽度影响（列表勾选列） */
input[type="checkbox"] { width: auto; height: auto; margin: 0; vertical-align: middle; cursor: pointer; }

/* 管理员工具条（谈话详情内） */
.admin-bar {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin-top: 10px; padding: 8px 10px; border-radius: 10px;
  background: #f6f9ff; border: 1px dashed #c9dcf5;
}
.admin-bar .tip { margin-left: auto; }

/* 单条消息的管理员操作按钮 */
.bubble .msg-ops { display: flex; gap: 6px; margin-top: 8px; justify-content: flex-end; }
.bubble .msg-ops .btn.sm { padding: 4px 9px; font-size: 12px; }

/* 已撤回的消息：居中灰色留痕，内容不可见 */
.bubble.b-revoked {
  background: #f2f4f8; border: 1px dashed #d7dde8; color: var(--muted);
  max-width: 100%; margin-left: auto; margin-right: auto; text-align: center;
  font-size: 13px; padding: 8px 12px;
}
.bubble.b-revoked .msg-revoked { font-style: italic; }
/* 撤回按钮与剩余秒数 */
.revoke-btn { white-space: nowrap; }
.revoke-btn .rv-left { opacity: .72; font-variant-numeric: tabular-nums; }

.login-mask {
  position: fixed; inset: 0;
  background: linear-gradient(160deg, #eef3fb 0%, #dfe9f7 60%, #d3e0f2 100%);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.login-box { background: #fff; padding: 28px; border-radius: 16px; width: 320px; }
.login-box h2 { margin: 0 0 16px; text-align: center; }

.modal-mask {
  position: fixed; inset: 0; background: rgba(40, 56, 90, .5);
  display: none; align-items: center; justify-content: center; z-index: 60; padding: 16px;
}
.modal {
  background: #fff; border-radius: 16px; width: 100%; max-width: 720px;
  max-height: 88vh; overflow: auto; padding: 22px;
}
.modal h3 { margin: 0 0 6px; }
.close-x { float: right; cursor: pointer; color: var(--muted); font-size: 22px; line-height: 1; }
.hidden { display: none !important; }
.tip { font-size: 13px; color: var(--muted); }

/* 数据范围提示（心理老师按「学校」隔离） */
.scope-tip {
  margin-bottom: 14px; padding: 9px 12px; border-radius: 10px; font-size: 13px;
  background: #eef4ff; color: #35598f; border: 1px solid #d8e4f8;
}
.scope-tip.warn { background: #fff5f5; color: #a93226; border-color: #f0c2c2; }

/* 重置密码结果框（新密码可复制） */
.pwd-box {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  margin: 12px 0; padding: 12px 14px; border: 1px dashed #c9d6ea; border-radius: 10px;
  background: #f6f9ff; font-family: ui-monospace, Consolas, "Courier New", monospace;
  font-size: 18px; letter-spacing: 1px; color: #23406b; word-break: break-all;
}

/* 分页栏 */
.pager {
  margin-top: 14px; display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 10px; font-size: 14px; color: #44506a;
}
.pager .pager-info { white-space: nowrap; display: flex; align-items: center; gap: 4px; }
.pager .pager-info b { font-weight: 600; }
.pager select {
  width: auto; min-width: 76px; margin: 0; padding: 7px 8px; font-size: 14px; cursor: pointer;
}
.pager .pager-nav { display: flex; gap: 6px; flex-wrap: wrap; }
.pager .pager-nav .btn { white-space: nowrap; }
.pager .pager-nav .btn[disabled] { opacity: .45; cursor: not-allowed; }

/* 账号管理工具栏：筛选在左、按钮组在右 */
.toolbar { display: flex; justify-content: space-between; align-items: flex-end; flex-wrap: wrap; gap: 12px; margin-top: 16px; }
.toolbar .filters { margin: 0; flex: 1; min-width: 260px; }
.toolbar .actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

/* 基础数据（学年 / 学校 / 班级） */
.meta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 18px; }
.meta-h { margin: 0 0 10px; font-size: 16px; }
.meta-add { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.meta-add input { flex: 1; min-width: 140px; }
.meta-add .btn { flex: 0 0 auto; white-space: nowrap; }
.meta-list { margin-top: 12px; }
.meta-item {
  display: flex; align-items: center; gap: 8px; padding: 7px 10px;
  border: 1px solid var(--line); border-radius: 10px; margin-bottom: 8px; background: #fff;
}
.meta-item .meta-name { flex: 1; font-size: 14px; word-break: break-all; }
.meta-item .meta-usage { font-size: 12px; color: var(--muted); white-space: nowrap; }
.meta-item .meta-btns { display: flex; gap: 4px; align-items: center; flex-wrap: wrap; }
.meta-item .btn.sm { padding: 5px 10px; }
.meta-group {
  margin: 14px 0 8px; font-size: 13px; font-weight: 600; color: #44506a;
  border-left: 3px solid var(--primary); padding-left: 8px;
}
.meta-group:first-child { margin-top: 0; }
.meta-school-sel { width: auto; min-width: 120px; padding: 5px 8px; font-size: 13px; margin: 0; }

@media (max-width: 860px) {
  .meta-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .bubble { max-width: 92%; }
  .pager { justify-content: center; }
}