:root{--bd:#0d1117;--bd2:#161b22;--line:#21262d;--fg:#e6edf3;--muted:#8b949e;
--blue:#58a6ff;--green:#3fb950;--red:#f85149;--content:#f6f8fa;--cf:#1f2328;--cb:#d0d7de;--cm:#59636e}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,"Noto Sans SC",Segoe UI,Helvetica,Arial,sans-serif;background:var(--content);color:var(--cf)}
a{color:var(--blue);text-decoration:none}

/* layout */
.side{position:fixed;left:0;top:0;bottom:0;width:230px;background:var(--bd);color:var(--fg);
display:flex;flex-direction:column;z-index:20}
.side .logo{padding:20px 20px 16px;border-bottom:1px solid var(--line);font-weight:800;font-size:15px;
display:flex;align-items:center;gap:9px}
.side .logo small{display:block;font-size:9px;color:var(--muted);font-weight:500;letter-spacing:.12em;margin-top:2px}
.side nav{padding:12px 10px;flex:1;overflow-y:auto}
.side .grp{font-size:9.5px;color:var(--muted);letter-spacing:.14em;padding:12px 12px 6px}
.side nav a{display:flex;align-items:center;gap:10px;padding:8px 12px;border-radius:8px;color:#c9d1d9;
font-size:13px;margin-bottom:2px;transition:background .12s}
.side nav a svg{width:15px;height:15px;color:var(--muted)}
.side nav a:hover{background:#1c2330}
.side nav a.active{background:#1f6feb;color:#fff}
.side nav a.active svg{color:#fff}
.side .me{border-top:1px solid var(--line);padding:13px 16px;font-size:12px;color:var(--muted)}
.side .me b{color:var(--fg);font-size:12.5px}
.side .me a{font-size:11px}

/* brand logo（黑色奔跑鼠在深色侧栏上反白） */
.side .brand-logo{padding:16px 16px 14px;align-items:center;gap:11px}
.brand-runner-wrap{position:relative;flex-shrink:0;width:42px;height:42px}
.brand-runner{width:42px;height:42px;border-radius:50%;
  filter:brightness(0) invert(1);}
.brand-txt{display:flex;flex-direction:column;font-size:14px;line-height:1.3}
.brand-txt small{font-size:8.5px}
/* 蓝V位于飞腾鼠 logo 右下角 */
.brand-txt .brand-v{display:none}
.brand-runner-wrap .brand-v{position:absolute;bottom:-3px;right:-6px;width:17px;height:17px;border-radius:50%;
  border:2px solid var(--bd)}

/* 侧栏红点 */
.side nav a .nav-dot{margin-left:auto;background:#da3633;color:#fff;font-size:10px;font-weight:700;
  min-width:18px;height:18px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;padding:0 5px}

/* 顶栏邮箱入口与红点 */
.mailbox-entry{position:relative;display:inline-flex;color:var(--cm);padding:4px;border-radius:8px}
.mailbox-entry:hover{background:#f3f4f6;color:#1f2328}
.mailbox-entry svg{width:18px;height:18px}
.mailbox-entry .mail-dot{position:absolute;top:-3px;right:-5px;background:#da3633;color:#fff;
  font-size:10px;font-weight:700;min-width:17px;height:17px;border-radius:9px;display:flex;
  align-items:center;justify-content:center;padding:0 4px;border:1.5px solid #fff}

.main{margin-left:230px;min-height:100vh}
.topbar{background:#fff;border-bottom:1px solid var(--cb);padding:13px 26px;display:flex;
align-items:center;gap:14px;position:sticky;top:0;z-index:10}
.topbar h1{font-size:16px;margin:0;flex:1}
.content{padding:26px}

/* cards */
.card{background:#fff;border:1px solid var(--cb);border-radius:12px;margin-bottom:20px}
.card .ch{padding:14px 18px;border-bottom:1px solid var(--cb);font-weight:700;font-size:14px;
display:flex;align-items:center;gap:9px}
.card .cb{padding:18px}
.card .cf{padding:13px 18px;border-top:1px solid var(--cb);font-size:12px;color:var(--cm)}

/* stat cards */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:20px}
.stat{background:#fff;border:1px solid var(--cb);border-radius:12px;padding:18px}
.stat .l{font-size:12px;color:var(--cm);display:flex;align-items:center;gap:7px}
.stat .l svg{width:14px;height:14px}
.stat .n{font-size:27px;font-weight:800;margin-top:7px;font-variant-numeric:tabular-nums}
.stat .s{font-size:11px;color:var(--cm);margin-top:4px}

/* tables */
table.tbl{width:100%;border-collapse:collapse;font-size:13px}
table.tbl th{text-align:left;font-size:11px;color:var(--cm);font-weight:600;padding:9px 14px;
border-bottom:1px solid var(--cb);background:#f6f8fa}
table.tbl td{padding:11px 14px;border-bottom:1px solid #e8edf2;vertical-align:middle}
table.tbl tr:last-child td{border-bottom:none}
table.tbl tr:hover td{background:#fafbfc}

/* badges */
.badge{display:inline-block;font-size:10.5px;padding:2px 9px;border-radius:99px;font-weight:600}
.badge.green{background:#dafbe1;color:#1a7f37}
.badge.red{background:#ffebe9;color:#cf222e}
.badge.gray{background:#eaeef2;color:#59636e}
.badge.blue{background:#ddf4ff;color:#0969da}
.badge.purple{background:#fbefff;color:#8250df}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid rgba(31,35,40,.15);
border-radius:7px;padding:6px 14px;font-size:12.5px;cursor:pointer;font-family:inherit;
background:#f6f8fa;color:#1f2328;font-weight:600;transition:background .12s,transform .1s}
.btn:hover{background:#eaeef2}
.btn:active{transform:scale(.97)}
.btn.solid{background:#1f883d;color:#fff;border-color:rgba(0,0,0,.1)}
.btn.solid:hover{background:#1a7f37}
.btn.dark{background:#1f2328;color:#fff}
.btn.dark:hover{background:#000}
.btn.danger{color:#cf222e}
.btn.danger:hover{background:#ffebe9}
.btn.sm{padding:3px 10px;font-size:11.5px}

/* forms */
.form-row{margin-bottom:15px}
.form-row label{display:block;font-size:12.5px;font-weight:600;margin-bottom:6px}
.form-row .hint{font-size:11px;color:var(--cm);margin-top:4px}
input[type=text],input[type=email],input[type=password],select,textarea{
width:100%;border:1px solid var(--cb);border-radius:8px;padding:8px 12px;font-size:13px;
font-family:inherit;color:var(--cf);background:#fff;outline:none;
transition:border-color .12s,box-shadow .12s}
input:focus,select:focus,textarea:focus{border-color:#0969da;box-shadow:0 0 0 3px rgba(9,105,218,.15)}
textarea{min-height:110px;resize:vertical;line-height:1.7}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}

.flash{padding:10px 15px;border-radius:9px;font-size:13px;margin-bottom:16px}
.flash.ok{background:#dafbe1;color:#1a7f37;border:1px solid #aceebb}
.flash.err{background:#ffebe9;color:#cf222e;border:1px solid #ffcecb}

.pager{display:flex;gap:6px;align-items:center;font-size:12px;color:var(--cm)}
.pager a,.pager span{padding:4px 10px;border:1px solid var(--cb);border-radius:7px;background:#fff}
.pager .cur{background:#1f2328;color:#fff;border-color:#1f2328}

/* login page */
.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;
background:#0d1117;padding:20px}
.login-box{width:360px;background:#161b22;border:1px solid var(--line);border-radius:14px;padding:30px}
.login-box .lg{text-align:center;margin-bottom:22px}
.login-box .lg b{font-size:18px;color:#fff}
.login-box .lg span{display:block;font-size:11px;color:var(--muted);margin-top:5px;letter-spacing:.1em}
.login-box label{color:#c9d1d9;font-size:12.5px;font-weight:600}
.login-box input{background:#0d1117;border-color:#30363d;color:#e6edf3}
.login-box input:focus{border-color:#1f6feb;box-shadow:0 0 0 3px rgba(31,111,235,.3)}
.login-box .btn{width:100%;justify-content:center;background:#238636;color:#fff;border:none;padding:9px}
.login-box .btn:hover{background:#2ea043}

@media(max-width:900px){
  .side{transform:translateX(-100%);transition:transform .2s}
  .side.open{transform:none}
  .main{margin-left:0}
  .stats{grid-template-columns:1fr 1fr}
  .form-grid{grid-template-columns:1fr}
  .menu-btn{display:inline-flex}
}
.menu-btn{display:none}