* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.container {
    width: 100%;
    max-width: 900px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    overflow: hidden;
    margin-top: 20px;
}

.header {
    background: #667eea;
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 2em;
}

.content {
    padding: 30px;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid #eee;
}

.nav-item {
    padding: 10px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 1em;
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
    color: #666;
}

.nav-item.active {
    color: #667eea;
    border-bottom-color: #667eea;
    font-weight: 600;
}

.nav-item:hover {
    color: #667eea;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.section {
    margin-bottom: 30px;
}

.section h2 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.5em;
}

.form-group {
    margin-bottom: 15px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.form-group input {
    flex: 1;
    min-width: 150px;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1em;
    outline: none;
}

.form-group input:focus {
    border-color: #667eea;
}

.form-group button {
    padding: 12px 24px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background 0.3s;
    font-weight: 600;
}

.form-group button:hover {
    background: #764ba2;
}

.filter-box {
    margin-bottom: 15px;
}

.filter-box input {
    width: 100%;
    padding: 10px;
    border: 1px solid #eee;
    border-radius: 5px;
    font-size: 0.9em;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

table th {
    background: #f5f5f5;
    padding: 12px;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid #ddd;
    color: #333;
}

table td {
    padding: 12px;
    border-bottom: 1px solid #eee;
}

table tr:hover {
    background: #f9f9f9;
}

.delete-btn {
    background: #e74c3c;
    color: white;
    padding: 5px 10px;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background 0.3s;
}

.delete-btn:hover {
    background: #c0392b;
}

/* Notifications */
#notification-area {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 1000;
}

.toast {
    padding: 15px 25px;
    background: #333;
    color: white;
    border-radius: 5px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.toast.success { background: #2ecc71; }
.toast.error { background: #e74c3c; }

@media (max-width: 600px) {
    .form-group { flex-direction: column; }
    .nav-item { padding: 10px; font-size: 0.9em; }
}