:root{--bg:#0b1220;--text:rgba(255,255,255,.92);--muted:rgba(255,255,255,.68);--accent:#2aa8ff;--accent2:#7c5cff;--ok:#40d88b;--shadow:0 18px 55px rgba(0,0,0,.35);--radius:18px;--mono:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;--sans:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,"Noto Sans","Liberation Sans",sans-serif}
*{box-sizing:border-box}html,body{height:100%}
body{margin:0;font-family:var(--sans);color:var(--text);
background:radial-gradient(1200px 700px at 15% 12%, rgba(42,168,255,.22), transparent 55%),
radial-gradient(900px 600px at 80% 20%, rgba(124,92,255,.18), transparent 55%),
radial-gradient(900px 650px at 55% 90%, rgba(64,216,139,.10), transparent 55%),var(--bg);overflow:auto}
a{color:inherit}
.app{min-height:100%;display:grid;grid-template-columns:320px 1fr;gap:18px;padding:18px}
.card{background:linear-gradient(180deg, rgba(255,255,255,.085), rgba(255,255,255,.05));border:1px solid rgba(255,255,255,.10);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.sidebar{display:flex;flex-direction:column;min-height:0}
.brand{padding:18px 18px 14px;border-bottom:1px solid rgba(255,255,255,.10);display:flex;align-items:center;gap:12px}
.logo{width:40px;height:40px;border-radius:14px;background:conic-gradient(from 190deg, var(--accent), var(--accent2), var(--accent));box-shadow:0 12px 28px rgba(42,168,255,.18);position:relative}
.logo:after{content:"";position:absolute;inset:2px;border-radius:12px;background:rgba(0,0,0,.22);border:1px solid rgba(255,255,255,.10);backdrop-filter:blur(6px)}
.brand h1{margin:0;font-size:14px;letter-spacing:.2px;line-height:1.2}
.brand .sub{font-size:12px;color:var(--muted);margin-top:2px}
.sidebarTop{padding:14px 18px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid rgba(255,255,255,.10)}
.chip{font-size:12px;color:rgba(255,255,255,.86);background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);padding:8px 10px;border-radius:999px;display:flex;align-items:center;gap:8px}
.chip b{font-family:var(--mono);font-weight:750;font-size:11px}
.toggle{display:flex;align-items:center;gap:10px;user-select:none}
.toggle label{font-size:12px;color:var(--muted)}
.switch{width:54px;height:30px;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.18);border-radius:999px;position:relative;cursor:pointer;transition:background .25s ease}
.knob{width:24px;height:24px;border-radius:999px;position:absolute;top:2px;left:2px;background:linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.76));box-shadow:0 12px 24px rgba(0,0,0,.25);transition:transform .25s ease}
.switch.on{background:rgba(42,168,255,.25);border-color:rgba(42,168,255,.35)}
.switch.on .knob{transform:translateX(24px)}
.topics{padding:10px;overflow:auto;min-height:0}
.topic{padding:12px;border-radius:16px;border:1px solid transparent;display:flex;align-items:flex-start;gap:10px;cursor:pointer;transition:transform .12s ease, background .18s ease, border-color .18s ease;margin-bottom:8px;background:rgba(255,255,255,.04)}
.topic:hover{transform:translateY(-1px);background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.12)}
.topic.active{background:rgba(42,168,255,.16);border-color:rgba(42,168,255,.30)}
.ticon{width:34px;height:34px;border-radius:12px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);display:grid;place-items:center;flex:0 0 auto}
.tmain{min-width:0}
.tmain .tt{font-weight:750;font-size:13px;margin:0 0 3px}
.tmain .td{font-size:12px;color:var(--muted);margin:0;line-height:1.35}
.pill{font-size:11px;padding:4px 8px;border-radius:999px;border:1px solid rgba(255,255,255,.14);color:rgba(255,255,255,.78);background:rgba(0,0,0,.12);white-space:nowrap}
.main{display:flex;flex-direction:column;min-height:0}
.header{padding:16px 18px;border-bottom:1px solid rgba(255,255,255,.10);display:flex;gap:12px;align-items:center;justify-content:space-between}
.headerTitle{font-size:16px;font-weight:950;margin:0;letter-spacing:.2px}
.headerSub{font-size:12px;color:var(--muted);margin:0}
.headerLeft{display:flex;flex-direction:column;gap:4px}
.headerRight{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.btn{border:none;color:rgba(255,255,255,.92);background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);padding:10px 12px;border-radius:16px;cursor:pointer;transition:transform .12s ease, background .18s ease, border-color .18s ease;font-size:12px;text-decoration:none;display:inline-flex;align-items:center;gap:8px}
.btn:hover{transform:translateY(-1px);background:rgba(255,255,255,.10);border-color:rgba(255,255,255,.18)}
.btn.primary{background:linear-gradient(180deg, rgba(42,168,255,.40), rgba(42,168,255,.18));border-color:rgba(42,168,255,.40)}
.btn.ghost{background:rgba(0,0,0,.12)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.subnav{padding:10px 12px;border-bottom:1px solid rgba(255,255,255,.10);display:flex;gap:8px;flex-wrap:wrap;background:rgba(0,0,0,.12)}
.tab{padding:8px 10px;border-radius:999px;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.06);color:rgba(255,255,255,.85);cursor:pointer;font-size:12px}
.tab.active{background:rgba(124,92,255,.22);border-color:rgba(124,92,255,.35)}
.content{padding:18px;overflow:auto;min-height:0;display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
.panel{border-radius:var(--radius);background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.10);overflow:hidden}
.panelHead{padding:14px 14px 10px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid rgba(255,255,255,.08);background:rgba(0,0,0,.10)}
.panelHead h3{margin:0;font-size:13px;letter-spacing:.2px}
.badge{font-size:11px;padding:4px 8px;border-radius:999px;border:1px solid rgba(255,255,255,.14);color:rgba(255,255,255,.78);background:rgba(255,255,255,.06)}
.panelBody{padding:14px}
.big{font-size:26px;font-weight:980;margin:0 0 6px;letter-spacing:.2px;background:linear-gradient(90deg, rgba(255,255,255,.92), rgba(255,255,255,.70));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{margin:0 0 14px;color:rgba(255,255,255,.80);line-height:1.5}
.section{margin-top:14px;padding-top:14px;border-top:1px dashed rgba(255,255,255,.14)}
.section h4{margin:0 0 10px;font-size:12px;letter-spacing:.2px;color:rgba(255,255,255,.82);text-transform:uppercase}
ul{margin:0;padding-left:18px}li{margin:6px 0;color:rgba(255,255,255,.85);line-height:1.45}
.callout{border-radius:16px;padding:12px;border:1px solid rgba(255,255,255,.12);background:rgba(255,255,255,.06);margin-top:12px}
.row{display:flex;gap:10px;align-items:flex-start}
.dot{width:10px;height:10px;border-radius:999px;margin-top:5px;background:var(--accent);box-shadow:0 0 0 6px rgba(42,168,255,.15);flex:0 0 auto}
.callout b{display:block;margin-bottom:4px}.callout p{margin:0;color:rgba(255,255,255,.80);line-height:1.45;font-size:13px}
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:12px}
.cardLink{display:block;padding:14px;border-radius:18px;border:1px solid rgba(255,255,255,.12);background:rgba(255,255,255,.05);text-decoration:none}
.cardLink:hover{background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.16)}
.cardLink .h{font-weight:900;margin:0 0 4px;font-size:13px}.cardLink .p{margin:0;color:var(--muted);font-size:12px;line-height:1.35}
.tableWrap{overflow:auto;border-radius:16px;border:1px solid rgba(255,255,255,.10);background:rgba(0,0,0,.12)}
table{border-collapse:collapse;width:100%;min-width:820px}
th,td{border-bottom:1px solid rgba(255,255,255,.08);padding:10px 10px;vertical-align:top}
th{position:sticky;top:0;background:rgba(0,0,0,.25);text-align:left;font-size:12px}
td{font-size:12px;color:rgba(255,255,255,.85)}td .t{white-space:pre-line}
td.time{color:rgba(255,255,255,.75);font-family:var(--mono);font-size:11px}
.teacherOnly{display:none}.mode-teacher .teacherOnly{display:block}
.teacherBadge{display:none;gap:8px;align-items:center}.mode-teacher .teacherBadge{display:inline-flex}.mode-teacher .studentBadge{display:none}
.present .reveal-item{opacity:0;transform:translateY(4px);transition:opacity .18s ease,transform .18s ease}
.present .reveal-item.revealed{opacity:1;transform:none}
.actionBar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:10px 0 0}
.badgeMini{font-size:11px;padding:6px 10px;border-radius:999px;border:1px solid rgba(255,255,255,.14);background:rgba(0,0,0,.12);color:rgba(255,255,255,.78)}
.footer{padding:12px 18px;border-top:1px solid rgba(255,255,255,.10);color:rgba(255,255,255,.55);font-size:11px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
@media (max-width:1050px){.app{grid-template-columns:1fr}.content{grid-template-columns:1fr}.cards{grid-template-columns:1fr}}
@media print{body{background:white;color:black}.app{display:block;padding:0}.sidebar,.headerRight,.footer{display:none !important}.card{box-shadow:none;border:none}.panel{border:1px solid #ddd;background:white}.panelHead{background:#f4f4f4;border-bottom:1px solid #ddd}.big{color:black !important;-webkit-text-fill-color:black}.lead,li,td,.callout p{color:#222 !important}.badge{border:1px solid #ddd;color:#222;background:#fff}}