:root{
  --bg:#0b1020;
  --panel:#111936;
  --panel2:#0f1733;
  --text:#eaf0ff;
  --muted:#a8b2d6;
  --accent:#7aa7ff;
  --ok:#35d39a;
  --bad:#ff5c7a;
  --warn:#ffcc66;
  --border:rgba(255,255,255,.10);
  --shadow: 0 12px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", Arial;
  background: radial-gradient(1200px 800px at 10% 0%, #182455 0%, var(--bg) 60%),
              radial-gradient(1000px 700px at 90% 10%, #2a154f 0%, var(--bg) 55%);
  color:var(--text);
}

.topbar{
  position:sticky; top:0; z-index:10;
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 18px;
  border-bottom:1px solid var(--border);
  background: rgba(11,16,32,.7);
  backdrop-filter: blur(10px);
}
.brand{display:flex; gap:12px; align-items:center}
.logo{font-size:26px; width:42px; height:42px; display:grid; place-items:center; background:rgba(122,167,255,.12); border:1px solid rgba(122,167,255,.35); border-radius:14px; box-shadow: var(--shadow)}
.title{font-weight:800; letter-spacing:.2px}
.subtitle{font-size:12px; color:var(--muted); margin-top:2px}
.actions{display:flex; gap:10px}

.layout{display:grid; grid-template-columns: 320px 1fr; gap:16px; padding:16px; max-width: 1400px; margin:0 auto;}

.sidebar{position:sticky; top:78px; align-self:start; height: calc(100vh - 94px); overflow:auto; padding-right:6px;}
.panel{
  background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border:1px solid var(--border);
  border-radius:18px;
  padding:14px;
  box-shadow: var(--shadow);
  margin-bottom:12px;
}
.panelTitle{font-weight:800; margin-bottom:10px}

.dayTabs{display:grid; grid-template-columns: repeat(5, 1fr); gap:8px}
.subjectTabs{display:grid; grid-template-columns: 1fr; gap:8px}

.tab{
  background: rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.10);
  color:var(--text);
  padding:10px 10px;
  border-radius:14px;
  cursor:pointer;
  transition: transform .06s ease, background .15s ease, border-color .15s ease;
  text-align:center;
  font-weight:700;
}
.tab:hover{transform: translateY(-1px); border-color: rgba(122,167,255,.35)}
.tab.active{background: rgba(122,167,255,.16); border-color: rgba(122,167,255,.55)}
.tab.small{padding:8px 8px; font-weight:800}
.tab.subject{display:flex; justify-content:space-between; align-items:center; text-align:left}
.tab.subject span{opacity:.95}
.tab.subject .pill{font-size:12px; color:var(--muted); background: rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.10); padding:4px 8px; border-radius:999px}

.stat{display:flex; flex-direction:column; gap:8px}
.statRow{display:flex; justify-content:space-between; color:var(--muted)}
.hint{margin-top:10px; font-size:12px; color:var(--muted); line-height:1.45}
.stack{display:flex; flex-direction:column; gap:8px}

.btn{
  background: rgba(122,167,255,.18);
  border:1px solid rgba(122,167,255,.45);
  color:var(--text);
  padding:10px 12px;
  border-radius:14px;
  cursor:pointer;
  font-weight:800;
}
.btn:hover{border-color: rgba(122,167,255,.8)}
.btn.ghost{background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.12)}
.btn.ghost:hover{border-color: rgba(255,255,255,.22)}
.btn.danger{background: rgba(255,92,122,.18); border-color: rgba(255,92,122,.50)}
.btn.danger:hover{border-color: rgba(255,92,122,.85)}

.footer{font-size:12px; color:var(--muted)}
.footer code{color:var(--text)}

.content{
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border:1px solid var(--border);
  border-radius:20px;
  box-shadow: var(--shadow);
  overflow:hidden;
}
.contentHeader{display:flex; justify-content:space-between; gap:12px; padding:16px 18px; border-bottom:1px solid var(--border); background: rgba(15,23,51,.55)}
.h1{font-size:18px; font-weight:900}
.h2{font-size:12px; color:var(--muted); margin-top:4px}

.badgeRow{display:flex; gap:8px; align-items:flex-start; flex-wrap:wrap; justify-content:flex-end}
.badge{font-size:12px; padding:6px 10px; border-radius:999px; border:1px solid rgba(255,255,255,.12); background: rgba(255,255,255,.06); color:var(--muted)}

.questionList{padding:14px 14px 20px}

.card{
  background: rgba(17,25,54,.75);
  border:1px solid rgba(255,255,255,.10);
  border-radius:18px;
  padding:14px;
  margin-bottom:12px;
}
.cardHeader{display:flex; align-items:flex-start; justify-content:space-between; gap:12px}
.qTitle{font-weight:900; line-height:1.35}
.qMeta{display:flex; gap:8px; flex-wrap:wrap; justify-content:flex-end}
.pill{
  font-size:12px; color:var(--muted);
  background: rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.12);
  padding:4px 8px;
  border-radius:999px;
}
.pill.ok{color: rgba(53,211,154,.95); border-color: rgba(53,211,154,.35); background: rgba(53,211,154,.08)}
.pill.bad{color: rgba(255,92,122,.98); border-color: rgba(255,92,122,.35); background: rgba(255,92,122,.08)}
.pill.warn{color: rgba(255,204,102,.98); border-color: rgba(255,204,102,.35); background: rgba(255,204,102,.08)}

.options{display:grid; grid-template-columns:1fr; gap:8px; margin-top:10px}
.option{
  display:flex; gap:10px; align-items:flex-start;
  padding:10px 10px;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
  cursor:pointer;
}
.option:hover{border-color: rgba(122,167,255,.35)}
.option input{margin-top:3px}
.option.correct{border-color: rgba(53,211,154,.55); background: rgba(53,211,154,.10)}
.option.wrong{border-color: rgba(255,92,122,.55); background: rgba(255,92,122,.08)}

.explain{margin-top:10px; padding:10px; border-radius:14px; border:1px dashed rgba(255,255,255,.18); color:var(--muted); line-height:1.55}
.explain strong{color:var(--text)}

.cardActions{display:flex; justify-content:space-between; gap:10px; align-items:center; margin-top:10px}
.smallText{font-size:12px; color:var(--muted)}

.dialog{border:none; border-radius:18px; width:min(820px, 92vw); box-shadow: var(--shadow); background: rgba(17,25,54,.96); color:var(--text)}
.dialog::backdrop{background: rgba(0,0,0,.55)}
.dialogHeader{display:flex; justify-content:space-between; align-items:center; padding:14px 14px; border-bottom:1px solid rgba(255,255,255,.10)}
.dialogTitle{font-weight:900}
.dialogBody{padding:14px}

.table{width:100%; border-collapse:collapse; overflow:hidden; border-radius:14px; border:1px solid rgba(255,255,255,.10)}
.table th,.table td{padding:10px; border-bottom:1px solid rgba(255,255,255,.08); font-size:13px}
.table th{color:var(--muted); text-align:left; background: rgba(255,255,255,.04)}

@media (max-width: 960px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:relative; top:auto; height:auto}
}