/* 我的错题库 · 统一视觉（学校产品风，克制、无渐变） */
:root{
  --navy:#16324f; --blue:#2b5f9e; --blue-weak:#eaf1f9;
  --bg:#eef1f5; --panel:#fff; --line:#dce3ea; --line-soft:#edf1f5;
  --ink:#1b2733; --muted:#6b7785; --ok:#1f7a4d; --warn:#a8690a; --bad:#b03a2e;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font:14px/1.65 "Microsoft YaHei","PingFang SC",system-ui,sans-serif}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{margin:0;font-weight:600}
.serif{font-family:"Source Han Serif SC","Songti SC","SimSun",serif}

.top{background:var(--panel);border-bottom:1px solid var(--line)}
.top-in{max-width:1120px;margin:0 auto;padding:14px 22px;display:flex;align-items:center;gap:14px}
.brand{display:flex;align-items:baseline;gap:10px}
.brand b{font-size:16px;letter-spacing:.5px}
.brand span{color:var(--muted);font-size:12px}
.top .spacer{flex:1}
.top .who{color:var(--muted);font-size:13px}
.top .who b{color:var(--ink)}

.wrap{max-width:1120px;margin:26px auto;padding:0 22px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:4px}
.panel-head{padding:14px 18px;border-bottom:1px solid var(--line-soft);display:flex;align-items:center;gap:10px}
.panel-head h2{font-size:15px}
.panel-head .sub{color:var(--muted);font-size:12px}
.panel-body{padding:16px 18px}

label{display:block;font-size:12px;color:var(--muted);margin:0 0 5px}
input,select,textarea{font:13px/1.6 "Microsoft YaHei",sans-serif;color:var(--ink);
  background:#fff;border:1px solid #c8d2dd;border-radius:3px;padding:8px 10px;width:100%}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 2px rgba(43,95,158,.12)}
textarea{resize:vertical;font-family:Consolas,"Courier New",monospace;font-size:12.5px}
.field{margin-bottom:12px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}

.btn{display:inline-block;border:1px solid #c8d2dd;background:#f7f9fb;color:var(--ink);
  padding:8px 16px;border-radius:3px;cursor:pointer;font:13px "Microsoft YaHei",sans-serif}
.btn:hover{border-color:#9fb4ca;background:#f2f6fa}
.btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn.primary:hover{background:#25528a}
.btn.ghost{background:transparent}
.btn.sm{padding:5px 10px;font-size:12px}
.btn[disabled]{opacity:.55;cursor:not-allowed}

.table{width:100%;border-collapse:collapse;font-size:13px}
.table th{background:#f6f8fb;color:var(--muted);font-weight:600;text-align:left;
  padding:9px 10px;border-bottom:1px solid var(--line);white-space:nowrap}
.table td{padding:9px 10px;border-bottom:1px solid var(--line-soft);vertical-align:middle}
.table tr:hover td{background:#fafcfe}
.table .num{font-family:Consolas,monospace}
.right{text-align:right}

.badge{display:inline-block;padding:1px 8px;border-radius:10px;font-size:12px;line-height:1.8;border:1px solid transparent}
.badge.gray{background:#f0f3f6;color:var(--muted);border-color:#e1e7ee}
.badge.blue{background:var(--blue-weak);color:var(--blue);border-color:#cfe0f2}
.badge.ok{background:#e9f5ee;color:var(--ok);border-color:#c8e6d5}
.badge.warn{background:#fdf3e4;color:var(--warn);border-color:#f0dcb8}
.badge.bad{background:#fbecea;color:var(--bad);border-color:#f0c9c3}

.tabs{display:flex;gap:2px;border-bottom:1px solid var(--line);margin-bottom:18px}
.tab{padding:9px 16px;cursor:pointer;border:1px solid transparent;border-bottom:none;
  color:var(--muted);font-size:13px;border-radius:3px 3px 0 0}
.tab:hover{color:var(--ink)}
.tab.on{background:var(--panel);border-color:var(--line);color:var(--ink);font-weight:600;
  margin-bottom:-1px;border-bottom:1px solid var(--panel)}

.muted{color:var(--muted)}
.small{font-size:12px}
.mt{margin-top:14px}
.mb{margin-bottom:14px}
.hidden{display:none!important}

.msg{margin-left:8px;font-size:13px}
.msg.ok{color:var(--ok)}.msg.err{color:var(--bad)}
.empty{padding:34px 12px;text-align:center;color:var(--muted);font-size:13px}
.hr{height:1px;background:var(--line-soft);margin:14px 0}

/* 登录页 */
.login{display:grid;grid-template-columns:1.05fr .95fr;max-width:1000px;margin:7vh auto;background:var(--panel);
  border:1px solid var(--line);border-radius:4px;overflow:hidden}
.login-intro{background:var(--navy);color:#fff;padding:44px 40px}
.login-intro .school{font-size:20px;letter-spacing:1px}
.login-intro .product{font-size:28px;margin:10px 0 6px;font-weight:600}
.login-intro .term{color:#b9c7d6;font-size:13px}
.login-intro ul{list-style:none;padding:0;margin:28px 0 0;color:#d5dde6;font-size:13px;line-height:2.1}
.login-intro li::before{content:"—";color:#6f89a4;margin-right:8px}
.login-form{padding:40px 38px}
.login-form h2{font-size:18px;margin-bottom:4px}
.login-form .hint{color:var(--muted);font-size:12px;margin-bottom:20px}
.role-switch{display:flex;border:1px solid var(--line);border-radius:3px;overflow:hidden;margin-bottom:22px}
.role-switch button{flex:1;border:none;background:#f7f9fb;padding:9px;cursor:pointer;
  font:13px "Microsoft YaHei",sans-serif;color:var(--muted)}
.role-switch button.on{background:var(--blue);color:#fff}
.footnote{max-width:1000px;margin:0 auto 40px;color:#8a96a3;font-size:12px;text-align:center;line-height:1.9}

@media(max-width:760px){
  .login{grid-template-columns:1fr;margin:16px}
  .login-intro{padding:28px 24px}
  .login-form{padding:26px 24px}
  .grid2,.grid3{grid-template-columns:1fr}
}