:root{
  --bg:#f5f6f8; --panel:#fff; --ink:#1f2430; --muted:#8a93a6;
  --brand:#2f6fed; --brand-d:#2257c4; --line:#e6e9f0; --ok:#16a34a; --off:#b45309;
  --danger:#dc2626; --shadow:0 1px 3px rgba(20,30,60,.08);
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);font-size:14px;line-height:1.5}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

/* 布局 */
.layout{display:flex;min-height:100vh}
.sidebar{width:220px;background:#0f1729;color:#cfd6e4;display:flex;flex-direction:column;position:fixed;height:100vh}
.brand{padding:18px 18px;font-weight:700;font-size:16px;color:#fff;border-bottom:1px solid #1e293b}
.sidebar nav{display:flex;flex-direction:column;padding:10px 0;flex:1}
.sidebar nav a{padding:11px 18px;color:#aeb8cc;font-size:14px}
.sidebar nav a:hover,.sidebar nav a.active{background:#1e293b;color:#fff;text-decoration:none}
.side-foot{padding:14px 18px;border-top:1px solid #1e293b;display:flex;justify-content:space-between;align-items:center}
.side-foot .who{font-size:13px;color:#aeb8cc}
.side-foot .logout{font-size:13px;color:#ff9b9b}
.content{margin-left:220px;flex:1;padding:24px 28px;max-width:1100px}

/* 卡片 */
.cards{display:flex;gap:14px;margin:8px 0 22px;flex-wrap:wrap}
.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px 20px;min-width:130px;box-shadow:var(--shadow)}
.card .num{font-size:26px;font-weight:700;color:var(--brand)}
.card .lbl{color:var(--muted);font-size:13px;margin-top:2px}

h2{font-size:17px;margin:22px 0 12px}
.muted{color:var(--muted)}

/* 表格 */
.tbl{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.tbl th,.tbl td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);font-size:13px}
.tbl th{background:#fafbfc;color:var(--muted);font-weight:600}
.tbl tr:last-child td{border-bottom:none}
.badge{background:var(--danger);color:#fff;border-radius:10px;padding:1px 7px;font-size:12px}
.ok{color:var(--ok)} .off{color:var(--off)}

/* 消息列表 */
.msg-list{list-style:none;margin:0;padding:0;background:var(--panel);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.msg-list li{border-bottom:1px solid var(--line)}
.msg-list li:last-child{border-bottom:none}
.msg-list a{display:grid;grid-template-columns:200px 1fr 150px 120px;gap:10px;padding:11px 14px;align-items:center}
.msg-list li.unread a{font-weight:600;background:#f0f6ff}
.msg-list .from{color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msg-list .subj{color:#445;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msg-list .box{color:var(--muted);font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msg-list .date{color:var(--muted);font-size:12px;text-align:right}

/* 工具栏 */
.toolbar{display:flex;gap:10px;align-items:center;margin-bottom:12px;flex-wrap:wrap}
.tabs a{padding:7px 14px;border:1px solid var(--line);background:#fff;border-radius:8px;color:#445}
.tabs a.active{background:var(--brand);color:#fff;border-color:var(--brand)}
.search{display:flex;gap:6px}
.filter-bar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:14px}
.filter-bar a{padding:4px 10px;border:1px solid var(--line);border-radius:20px;color:#556;font-size:13px}
.filter-bar a.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.pager{display:flex;gap:14px;align-items:center;margin-top:14px;color:var(--muted)}
.pager a{color:var(--brand)}

/* 表单 */
.form{max-width:640px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px;box-shadow:var(--shadow)}
.form .row{margin-bottom:14px}
.form label{display:block;font-weight:600;margin-bottom:5px;color:#334}
.form input[type=text],.form input[type=password],.form input:not([type]),.form select,.form textarea{
  width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-family:inherit}
.form textarea{resize:vertical}
.email-input{display:flex;align-items:center;gap:8px}
.email-input input{flex:1}
.email-input span{color:var(--muted);white-space:nowrap}
.adv{margin:10px 0;border:1px dashed var(--line);border-radius:8px;padding:10px}
.adv summary{cursor:pointer;color:var(--brand)}

/* 按钮 */
.btn,.btn-sm{display:inline-block;padding:9px 16px;background:var(--brand);color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:14px}
.btn:hover{background:var(--brand-d);text-decoration:none}
.btn.primary{background:var(--brand)} .btn.danger{background:var(--danger)}
.btn-sm{padding:5px 10px;font-size:13px}
.inline{display:inline}
.inline button{margin:0 2px}
.ops form{display:inline}

/* 提示 */
.alert{padding:10px 14px;border-radius:8px;margin:10px 0}
.alert.success{background:#e7f7ee;color:#0f7a3d;border:1px solid #b7e6c9}
.alert.error{background:#fdeaea;color:#b42318;border:1px solid #f5c2c2}
.alert.info{background:#eef3ff;color:#274690;border:1px solid #c7d8ff}

/* 邮件详情 */
.msg-view{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px;box-shadow:var(--shadow)}
.msg-head h2{margin:0 0 12px}
.meta div{padding:3px 0;color:#445;font-size:13px}
.html-body{width:100%;height:520px;border:1px solid var(--line);border-radius:8px;background:#fff}
.text-body{white-space:pre-wrap;font-family:inherit;background:#fafbfc;border:1px solid var(--line);border-radius:8px;padding:14px;max-height:520px;overflow:auto}
.atts{margin-top:14px;padding-top:12px;border-top:1px solid var(--line)}
.att{display:inline-block;margin-right:12px;padding:6px 12px;background:#eef3ff;border-radius:8px;color:var(--brand)}
.msg-actions{margin-top:18px;display:flex;gap:10px;flex-wrap:wrap}
.cron-tip{margin-top:20px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px}
.cron-tip pre{background:#0f1729;color:#cfe;padding:10px;border-radius:8px;overflow:auto}

/* 登录页 */
.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh}
.login-box{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:30px;width:360px;box-shadow:var(--shadow)}
.login-box h1{margin:0 0 4px;font-size:20px}
.login-box .sub{color:var(--muted);margin:0 0 18px}
.login-box label{display:block;font-weight:600;margin:12px 0 5px}
.login-box input{width:100%;padding:10px;border:1px solid var(--line);border-radius:8px}
.login-box button{width:100%;margin-top:18px;padding:11px;background:var(--brand);color:#fff;border:none;border-radius:8px;font-size:15px;cursor:pointer}
.login-box .tip{color:var(--muted);margin-top:14px;font-size:13px;text-align:center}