:root{--text:#334155;--text-h:#0f172a;--muted:#64748b;--bg:#eef6ff;--border:#dbeafe;--accent:#2563eb;--accent-strong:#1d4ed8;--button-blue:#1d4ed8;--sans:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;color:var(--text);background:var(--bg);font:16px/1.5 var(--sans);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{min-width:320px;min-height:100svh;margin:0}button,input,select{font:inherit}button{-webkit-tap-highlight-color:transparent}h1,h2,p{overflow-wrap:anywhere}h1,h2{color:var(--text-h);letter-spacing:0;font-weight:850;line-height:1.08}h1{font-size:clamp(32px,5vw,56px)}h2{font-size:24px}.app-shell{width:min(1320px,100% - 40px);margin:0 auto;padding:28px 0 36px}.login-shell{place-items:center;width:min(100% - 32px,480px);min-height:100svh;margin:0 auto;padding:32px 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messageIn{0%{opacity:0;transform:translateY(6px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}@keyframes syncPulse{0%,to{opacity:.45}50%{opacity:1}}@media (width<=980px){.dashboard-shell{grid-template-columns:88px minmax(0,1fr)}.sidebar{padding:12px}.sidebar-brand{padding-bottom:12px}.sidebar-logo{object-fit:cover;object-position:left center;max-height:52px}.sidebar-link{grid-template-columns:1fr;justify-items:center;padding:0}.sidebar-link span{display:none}.topbar{grid-template-columns:1fr}.global-search{width:100%}.topbar-actions{justify-content:space-between}.stats-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.app-header{grid-template-columns:1fr;align-items:start}.header-brand{grid-template-columns:minmax(180px,300px) minmax(0,1fr)}.header-actions{justify-content:space-between;width:100%}.account-stack{min-width:220px}.header-logo{width:min(100%,340px)}.summary{margin-left:auto}.filters,.details-grid{grid-template-columns:1fr}.detail-panel+.detail-panel{border-top:1px solid var(--border);border-left:0}.chat-layout{grid-template-columns:330px minmax(0,1fr)}}@media (width<=760px){.dashboard-shell{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--border);height:auto;position:static}.sidebar-brand{display:none}.sidebar-nav{gap:8px;padding-top:0;display:flex;overflow-x:auto}.sidebar-link{flex:none;grid-template-columns:20px auto auto;justify-items:start;padding:0 12px}.sidebar-link span{display:inline}.topbar{padding:14px;position:static}.topbar-actions{grid-template-columns:1fr;display:grid}.topbar-profile,.logout-button{grid-column:1/-1}.content-area{padding:14px}.page-heading{flex-direction:column;align-items:start}.stats-grid,.filter-card{grid-template-columns:1fr}.modern-table-header{flex-direction:column;align-items:flex-start;padding:16px}.modern-teacher-table{min-width:900px}.modern-teacher-table th,.modern-teacher-table td{padding:13px 14px}.app-shell{width:min(100% - 20px,1320px);padding:10px 0 24px}.app-header,.details-heading,.table-heading{align-items:stretch}.header-brand,.header-actions{grid-template-columns:1fr}.header-brand{display:grid}.header-actions{gap:10px;display:grid}.account-stack{min-width:0}.summary{grid-template-columns:38px minmax(0,1fr);width:100%;margin-left:0}.summary small{max-width:none}.details-heading{grid-template-columns:1fr}.main-nav{grid-template-columns:1fr;display:grid}.tabs,.detail-list,.chat-layout,.message-composer{grid-template-columns:1fr}.tab{border-bottom:1px solid #60a5fa;border-right:0}.tab:last-child{border-bottom:0}.chat-layout{height:auto;min-height:auto}.conversation-panel{border-right:0;border-bottom:1px solid var(--border)}.conversation-list{max-height:320px}.chat-panel{min-height:560px}.message-bubble{max-width:88%}.message-list{padding:16px 14px}}