:root{--bg:#efe8dc;--bg-strong:#f7f2ea;--panel:#fffbf5d6;--panel-strong:#fffdf9f5;--line:#5c43291a;--text:#31281f;--muted:#7c6d5d;--accent:#b85c3f;--accent-soft:#b85c3f1f;--gold:#d2a35a;--danger:#cb5945;--green:#567d60;--shadow:0 30px 70px #452f161f;font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;color:var(--text);background:radial-gradient(circle at 0 0,#d2a35a2e,#0000 28%),radial-gradient(circle at 100% 0,#5d846e24,#0000 24%),linear-gradient(#f7f2ea 0%,#ece3d5 100%);margin:0;overflow:hidden}body{height:100vh}button{font:inherit}.teacher-app{height:100vh;padding:14px;overflow:hidden}.dashboard-hero{grid-template-columns:minmax(0,1.2fr) minmax(420px,.8fr);gap:10px;height:118px;margin-bottom:10px;display:grid}.hero-copy,.metric-card,.panel-surface{border:1px solid 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