:root{
  --bg:#f6f7f9; --card:#fff; --ink:#22272e; --ink2:#7a8494; --line:#e6e9ee;
  --pri:#3b6fd4; --pri-d:#2f59ad; --ok:#2f8f5b; --warn:#b97d10; --bad:#c24848;
  --r:10px; --shadow:0 1px 4px rgba(34,39,46,.07);
}
*{box-sizing:border-box;margin:0;padding:0}
[hidden]{display:none!important}
body{font-family:-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);font-size:14.5px;line-height:1.55;-webkit-tap-highlight-color:transparent}
a{color:var(--pri);cursor:pointer;text-decoration:none}
button{font:inherit;cursor:pointer;border:none;border-radius:8px;padding:8px 16px;background:var(--pri);color:#fff;min-height:36px}
button:disabled{opacity:.5;cursor:not-allowed}
button.ghost{background:transparent;color:var(--pri);border:1px solid var(--pri)}
button.plain{background:#eef1f5;color:var(--ink)}
button.danger{background:var(--bad)}
button.sm{padding:4px 10px;min-height:30px;font-size:13px}
input,select,textarea{font:inherit;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);width:100%}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--pri)}
label{display:block;font-size:13px;color:var(--ink2);margin:10px 0 4px}

.topbar{position:sticky;top:0;z-index:50;background:#fff;box-shadow:var(--shadow);display:flex;align-items:center;gap:24px;padding:0 24px;height:54px}
.brand{font-weight:700;font-size:16px;cursor:pointer;white-space:nowrap;letter-spacing:.5px}
.topnav{display:flex;gap:2px;flex:1;overflow-x:auto}
.topnav a{padding:7px 11px;border-radius:7px;color:var(--ink2);white-space:nowrap}
.topnav a.on,.topnav a:hover{background:#eef3fb;color:var(--pri)}
.topbar-right{display:flex;align-items:center;gap:8px;white-space:nowrap}
.nav-more{position:relative}
.nav-more>a{padding:7px 11px;border-radius:7px;color:var(--ink2);cursor:pointer;white-space:nowrap}
.nav-drop{display:none;position:absolute;right:0;top:100%;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);min-width:120px;padding:6px;z-index:60}
.nav-more.open .nav-drop{display:block}
.nav-drop a{display:block;padding:7px 10px;border-radius:6px;color:var(--ink)}
.nav-drop a:hover{background:#eef3fb;color:var(--pri)}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.stat-card{background:#f8f9fb;border:1px solid var(--line);border-radius:8px;padding:12px 14px;display:flex;flex-direction:column;gap:2px}
.stat-card b{font-size:22px}
.cs-msg{border:1px solid var(--line);border-radius:8px;padding:10px 12px;margin-bottom:10px}
.cs-q{display:flex;gap:8px;align-items:center;margin-bottom:4px}
.cs-a{background:#eef3fb;border-radius:6px;padding:8px 10px;margin-top:8px}
.cs-a p,.cs-a b{margin:0}
.cs-a p{margin-top:2px}
@media(max-width:760px){.grid4{grid-template-columns:repeat(2,1fr)}}

.tabbar{display:none;position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);z-index:50;padding-bottom:env(safe-area-inset-bottom)}
.tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;font-size:11px;color:var(--ink2);padding:9px 0;letter-spacing:.5px}
.tabbar a.on{color:var(--pri)}

main{max-width:1080px;margin:0 auto;padding:20px 16px 90px}
.page-title{font-size:19px;font-weight:700;margin:6px 0 16px;display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:16px;margin-bottom:16px}
.card>h4{font-size:15px;margin-bottom:8px}
.muted{color:var(--ink2);font-size:13px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.notice{background:#f4f7fc;border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:13px;color:var(--ink2)}

/* 登录 */
.auth-box{max-width:380px;margin:8vh auto 0}
.auth-box h1{font-size:22px;text-align:center;margin-bottom:20px}
.auth-tabs{display:flex;gap:6px;margin-bottom:14px}
.auth-tabs button{flex:1}

/* 课表 */
.tt-wrap{overflow-x:auto}
.tt{display:grid;grid-template-columns:56px repeat(7,minmax(92px,1fr));gap:4px;min-width:700px}
.tt .head{background:var(--pri);color:#fff;text-align:center;padding:8px 2px;border-radius:6px;font-weight:600;font-size:13px}
.tt .head.today{background:var(--pri-d)}
.tt .sec{display:flex;flex-direction:column;justify-content:center;align-items:center;font-size:12px;color:var(--ink2);background:#fff;border-radius:6px;padding:6px 0;min-height:88px}
.tt .cell{position:relative;border-radius:6px;min-height:88px;background:#fff}
.tt .course{position:absolute;inset:2px;border-radius:8px;padding:8px 6px;font-size:12.5px;color:#fff;overflow:hidden;cursor:pointer;display:flex;flex-direction:column;gap:2px}
.tt .course b{font-size:13px;line-height:1.3}
.tt .course.ghost{opacity:.28}
.course-detail{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:100;display:flex;align-items:center;justify-content:center;padding:16px}
.dialog{background:#fff;border-radius:12px;padding:20px;width:100%;max-width:440px;max-height:85vh;overflow:auto}
.dialog h3{margin-bottom:10px;font-size:16px}
.dialog .acts{display:flex;gap:8px;justify-content:flex-end;margin-top:16px;flex-wrap:wrap}

.badge{display:inline-block;padding:2px 8px;border-radius:99px;font-size:12px;background:#eef1f5;color:var(--ink2)}
.b-ok{background:#e4f2ea;color:var(--ok)} .b-warn{background:#f7eeda;color:var(--warn)} .b-bad{background:#f8e5e5;color:var(--bad)}
table.list{width:100%;border-collapse:collapse;font-size:13.5px}
table.list th,table.list td{padding:8px 6px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
table.list th{color:var(--ink2);font-weight:600;font-size:12.5px}
.chk{width:16px;height:16px;min-height:16px;padding:0;accent-color:var(--pri)}

#toast{position:fixed;left:50%;bottom:80px;transform:translateX(-50%);background:rgba(34,39,46,.94);color:#fff;padding:10px 18px;border-radius:10px;font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:200;max-width:86vw}
#toast.show{opacity:1}

.stats{display:flex;gap:8px;margin-bottom:10px;flex-wrap:wrap}
.stat{padding:4px 12px;border-radius:99px;font-size:13px;background:#eef1f5;color:var(--ink)}
textarea.code{font-family:Consolas,monospace;font-size:12px;height:110px}
.weekbar{display:flex;align-items:center;gap:8px;margin-bottom:12px;flex-wrap:wrap}
.weekbar button.pill{min-width:36px;min-height:36px;padding:0 10px;background:#fff;color:var(--ink);border:1px solid var(--line)}
.weekbar button.pill.on{background:var(--pri);color:#fff;border-color:var(--pri)}
.weekbar .wpills{display:flex;gap:6px;overflow-x:auto;flex:1}
.weekbar .pill[data-day]{min-width:52px}
hr.sep{border:none;border-top:1px solid var(--line);margin:14px 0}
.swatches{display:flex;flex-wrap:wrap;gap:8px;padding:4px 0}
.sw{width:26px;height:26px;min-height:26px;border-radius:50%;padding:0;border:2px solid transparent;cursor:pointer}
.sw.on{border-color:#22272e;box-shadow:0 0 0 2px #fff inset}
.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.quick-grid a{display:block;text-align:center;padding:10px 6px;background:#f8f9fb;border:1px solid var(--line);border-radius:8px;color:var(--ink);font-size:13.5px}
.quick-grid a:hover{border-color:var(--pri);color:var(--pri)}
.share-item{word-break:break-all;flex:1;min-width:200px;font-size:12.5px}

@media(max-width:760px){
  .topnav,.user-chip{display:none}
  .tabbar{display:flex}
  main{padding:14px 12px 96px}
  .grid2,.grid3{grid-template-columns:1fr}
  .page-title{font-size:17px}
  body{font-size:14px}
  .tt{min-width:640px}
}