:root{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--text-primary:#f8fafc;--text-secondary:#94a3b8;--text-muted:#64748b;--accent-primary:#6366f1;--accent-hover:#4f46e5;--accent-light:#6366f126;--success:#10b981;--success-light:#10b98126;--warning:#f59e0b;--danger:#ef4444;--border-color:#334155;--border-hover:#475569;--radius-sm:6px;--radius-md:12px;--radius-lg:20px;--shadow:0 4px 20px -2px #0000004d;--transition:all .25s cubic-bezier(.4, 0, .2, 1);--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);color:var(--text-primary);flex-direction:column;min-height:100vh;display:flex}#root{flex-direction:column;width:100%;min-height:100vh;display:flex}.container{width:100%;max-width:1200px;margin:0 auto;padding:24px}header{background-color:var(--bg-secondary);border-bottom:1px solid var(--border-color);z-index:100;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background-color:#1e293bd9;padding:16px 24px;position:sticky;top:0}.header-content{justify-content:space-between;align-items:center;max-width:1200px;margin:0 auto;display:flex}.logo-section{align-items:center;gap:10px;display:flex}.logo-icon{background:linear-gradient(135deg, var(--accent-primary), #a855f7);border-radius:var(--radius-md);color:#fff;justify-content:center;align-items:center;width:36px;height:36px;font-weight:700;display:flex}.logo-text{background:linear-gradient(to right, #fff, var(--text-secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:1.25rem;font-weight:700}.teacher-tabs{border-bottom:1px solid var(--border-color);gap:8px;margin-top:20px;display:flex;overflow-x:auto}.teacher-tab-btn{min-width:120px;color:var(--text-muted);cursor:pointer;white-space:nowrap;background:0 0;border:none;border-bottom:2px solid #0000;flex:1;padding:10px 14px;font-size:.9rem;font-weight:600;transition:color .15s,border-color .15s;position:relative}.teacher-tab-btn.blink{animation:.5s ease-in-out 2 tab-blink}.tab-unread-badge{background:var(--danger);color:#fff;text-align:center;border-radius:999px;min-width:16px;height:16px;padding:0 4px;font-size:.65rem;font-weight:700;line-height:16px;position:absolute;top:4px;right:10px}@keyframes tab-blink{0%,to{opacity:1}50%{opacity:.25}}.teacher-tab-btn:hover{color:var(--text-primary)}.teacher-tab-btn.active{color:var(--accent-primary);border-bottom-color:var(--accent-primary)}@media (width<=600px){.teacher-tabs{gap:0}.teacher-tab-btn{min-width:0;padding:10px 6px;font-size:.8rem}}.dashboard-grid{grid-template-columns:280px 1fr;gap:24px;margin-top:24px;display:grid}@media (width<=900px){.dashboard-grid{grid-template-columns:1fr}}.sidebar{flex-direction:column;gap:16px;display:flex}.card{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow);transition:var(--transition);padding:20px}.card:hover{border-color:var(--border-hover);transform:translateY(-2px)}.card-title{color:var(--text-primary);align-items:center;gap:8px;margin-bottom:16px;font-size:1.1rem;font-weight:600;display:flex}.list-item{border-bottom:1px solid var(--border-color);transition:var(--transition);border-radius:var(--radius-sm);justify-content:space-between;align-items:center;padding:12px;display:flex}.list-item:hover{background-color:#ffffff05}.list-item:last-child{border-bottom:none}input,textarea,select{background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);transition:var(--transition);padding:10px 14px;font-size:.9rem}input:focus,textarea:focus,select:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-light);outline:none}.btn{border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);border:none;justify-content:center;align-items:center;gap:8px;padding:10px 18px;font-size:.9rem;font-weight:500;display:inline-flex}.btn-primary{background-color:var(--accent-primary);color:#fff}.btn-primary:hover{background-color:var(--accent-hover);transform:translateY(-1px)}.btn-secondary{background-color:var(--bg-tertiary);color:var(--text-primary)}.btn-secondary:hover{background-color:#475569}.btn-outline{border:1px solid var(--border-color);color:var(--text-secondary);background-color:#0000}.btn-outline:hover{border-color:var(--text-secondary);color:var(--text-primary)}.btn-sm{padding:6px 12px;font-size:.8rem}.badge{border-radius:9999px;align-items:center;padding:4px 8px;font-size:.75rem;font-weight:600;display:inline-flex}.badge-primary{background-color:var(--accent-light);color:#818cf8}.badge-success{background-color:var(--success-light);color:#34d399}.badge-warning{color:#fbbf24;background-color:#f59e0b26}.flex-between{justify-content:space-between;align-items:center;display:flex}.gap-sm{gap:8px}.gap-md{gap:16px}.text-muted{color:var(--text-muted);font-size:.85rem}.gateway-screen{flex-direction:column;justify-content:center;align-items:center;max-width:600px;min-height:calc(100vh - 120px);margin:0 auto;padding:24px;display:flex}.gateway-cards{grid-template-columns:1fr;gap:20px;width:100%;margin-top:32px;display:grid}@keyframes toast-slide-in{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes modal-pop-in{0%{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}