*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #667eea;--secondary-color: #764ba2;--success-color: #10b981;--error-color: #ef4444;--warning-color: #f59e0b;--bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--text-dark: #1f2937;--text-light: #6b7280;--border-color: #e5e7eb;--card-shadow: 0 10px 30px rgba(0, 0, 0, .1)}body{font-family:Noto Sans Bengali,Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:var(--bg-gradient);min-height:100vh;padding:20px;line-height:1.6}.container{max-width:1200px;margin:0 auto}.header{text-align:center;color:#fff;margin-bottom:30px}.header h1{font-size:2rem;margin-bottom:10px;font-weight:700}.header p{font-size:1rem;opacity:.9}.main-content{display:grid;grid-template-columns:1fr 1fr;gap:20px}.card{background:#fff;border-radius:15px;padding:30px;box-shadow:var(--card-shadow)}.card h2{color:var(--primary-color);margin-bottom:20px;font-size:1.5rem;font-weight:600}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;color:var(--text-dark);font-weight:500}.form-group input,.form-group select,.form-group textarea{width:100%;padding:12px;border:2px solid var(--border-color);border-radius:8px;font-size:1rem;font-family:inherit;transition:border-color .3s}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary-color)}.btn{padding:12px 24px;background:var(--bg-gradient);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s;font-family:inherit}.btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.btn:active{transform:translateY(0)}.btn-block{width:100%}.btn-secondary{background:var(--text-light)}.btn-danger{background:var(--error-color)}.btn-edit{background:var(--warning-color);padding:8px 12px;margin-right:5px}.btn-delete{background:var(--error-color);padding:8px 12px}.btn-edit:hover,.btn-delete:hover{transform:translateY(-2px)}.search-input{width:100%;padding:12px;border:2px solid var(--border-color);border-radius:8px;font-size:1rem;font-family:inherit;transition:border-color .3s}.search-input:focus{outline:none;border-color:var(--primary-color)}.student-actions{display:flex;gap:5px;margin-left:10px}.student-list{max-height:500px;overflow-y:auto}.student-item{background:#f9fafb;padding:15px;border-radius:8px;margin-bottom:10px;border-left:4px solid var(--primary-color);transition:transform .2s}.student-item:hover{transform:translate(4px)}.student-item h3{color:var(--text-dark);margin-bottom:5px;font-size:1.1rem}.student-item p{color:var(--text-light);font-size:.9rem;margin:3px 0}.empty-state{text-align:center;padding:40px;color:var(--text-light)}.message{padding:12px;border-radius:8px;margin-bottom:15px;font-weight:500}.message.success{background:#d1fae5;color:#065f46;border:1px solid #6ee7b7}.message.error{background:#fee2e2;color:#991b1b;border:1px solid #fca5a5}.loading{text-align:center;padding:20px;color:var(--text-light)}@media (max-width: 768px){.main-content{grid-template-columns:1fr}.header h1{font-size:1.5rem}.card{padding:20px}.student-item{padding:12px}.student-actions{flex-direction:column;margin-left:0;margin-top:10px}.btn-edit,.btn-delete{width:100%;margin:2px 0}}