:root{--bg: #f6f7fb;--panel: #ffffff;--text: #171923;--muted: #8b8da4;--line: #e6e7f0;--primary: #6d5dfc;--primary-soft: #f0edff;--blue: #2477ff;--blue-soft: #eef6ff;--green: #16a765;--green-soft: #e9fbf2;--gold: #f6a800;--gold-soft: #fff7db;--danger: #e34d59;--danger-soft: #fff0f2;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-width:320px;background:var(--bg)}button,input,textarea,select{font:inherit}button{cursor:pointer}a{color:var(--primary);text-decoration:none}.screen-center{min-height:100vh;display:grid;place-items:center;color:var(--muted)}.app-frame{min-height:100vh;display:grid;grid-template-columns:244px 1fr}.sidebar{position:sticky;top:0;height:100vh;padding:22px 14px;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column}.brand{border:0;background:transparent;display:inline-flex;align-items:center;gap:14px;color:var(--text);font-size:21px;font-weight:800;padding:0 8px}.brand-mark{width:40px;height:40px;border-radius:13px;display:inline-grid;place-items:center;background:linear-gradient(135deg,#7865f5,#5f50da);color:#fff;font-weight:900;flex:0 0 auto}.side-nav{display:grid;gap:8px;margin-top:36px}.nav-item{display:flex;align-items:center;gap:14px;min-height:48px;padding:0 15px;border-radius:8px;color:var(--muted);font-weight:750}.nav-item.active{background:var(--primary-soft);color:var(--primary)}.sidebar-bottom{margin-top:auto;display:grid;gap:14px}.profile-chip{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;padding:12px}.avatar{width:42px;height:42px;border-radius:999px;background:var(--primary-soft);color:var(--primary);display:inline-grid;place-items:center;font-weight:800;flex:0 0 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var(--line);color:var(--muted);position:relative}.dot{position:absolute;width:9px;height:9px;border-radius:999px;right:11px;top:10px;background:var(--primary)}.link-button{background:transparent;color:var(--primary);padding:0;min-height:auto}.wide{width:100%}.signout{justify-content:flex-start;color:var(--muted)}.overview-grid{display:grid;grid-template-columns:repeat(3,minmax(190px,1fr));gap:22px}.stat-card,.panel,.class-card,.summary-card{background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:0 1px 2px #1a1a2d08}.stat-card{min-height:142px;padding:22px;display:grid;gap:9px;position:relative}.stat-card span,.stat-card small{color:var(--muted);font-weight:750}.stat-card strong{font-size:32px}.stat-card svg{position:absolute;right:22px;top:24px;padding:9px;width:46px;height:46px;border-radius:14px;color:var(--primary);background:var(--primary-soft)}.stat-card.blue svg{color:var(--blue);background:var(--blue-soft)}.stat-card.gold 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