:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}.dashboard{width:620px;margin:40px auto;padding:24px;background:#f9fafb;border-radius:12px;box-shadow:0 4px 12px #00000014;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.dashboard h2{text-align:center;margin-bottom:24px;color:#222}.student-list{list-style:none;padding:0;margin:0}.student-header,.student-item{display:grid;grid-template-columns:4fr 1fr 2fr 3fr 1fr;gap:12px;align-items:center;padding:12px 16px}.student-header{padding:10px 16px;font-size:13px;font-weight:600;color:#6b7280;border-bottom:2px solid #e5e7eb;margin-bottom:8px;text-align:left}.student-item{padding:12px 16px;margin-bottom:8px;background:#fff;border-radius:8px;box-shadow:0 2px 6px #0000000d;transition:background .15s ease}.student-item:hover{background:#f3f4f6}.student-name{font-weight:600;color:#111827;text-align:left}.student-gender,.student-class,.student-birthday{text-align:left;color:#4b5563}.student-name,.student-gender,.student-class,.student-birthday{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.delete-btn{justify-self:end;padding:4px 10px;font-size:13px;border:none;border-radius:6px;background:#ef4444;color:#fff;cursor:pointer;transition:background .2s ease}.delete-btn:hover{background:#b91c1c}.student-empty{padding:32px 16px;text-align:center;color:#9ca3af;font-size:14px;background:#fff;border-radius:8px;box-shadow:0 2px 6px #0000000d;grid-column:1 / -1}.loading{text-align:center;padding:48px 16px;color:#6b7280;font-size:14px}.error-container{text-align:center;padding:48px 24px;background:#fff;border-radius:8px;box-shadow:0 2px 6px #0000000d}.error-container h3{color:#ef4444;margin:0 0 12px;font-size:18px}.error-message{color:#6b7280;margin:0 0 24px;font-size:14px;line-height:1.5}.retry-btn{padding:10px 24px;font-size:14px;font-weight:500;border:none;border-radius:6px;background:#3b82f6;color:#fff;cursor:pointer;transition:background .2s ease}.retry-btn:hover{background:#2563eb}.success-banner{padding:12px 16px;margin-bottom:16px;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:6px;color:#16a34a;font-size:14px;line-height:1.5;animation:slideDown .3s ease-out}.error-banner{padding:12px 16px;margin-bottom:16px;background:#fef2f2;border:1px solid #fecaca;border-radius:6px;color:#dc2626;font-size:14px;line-height:1.5;animation:slideDown .3s ease-out}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.delete-btn:disabled{background:#9ca3af;cursor:not-allowed;opacity:.6}#root{max-width:1280px;margin:0 auto;padding:2rem;text-align:center}