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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, #2c3e50, #3498db);
    color: white;
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    flex-wrap: wrap;
    gap: 0.5rem;
}

.nav-brand {
    font-size: 1.3rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.nav-brand .nav-logo {
    height: 40px;
    width: auto;
    max-width: 160px;
    object-fit: contain;
    background: white;
    padding: 3px 6px;
    border-radius: 6px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.25rem;
    flex-wrap: wrap;
    align-items: center;
}

.nav-links a {
    color: white;
    text-decoration: none;
    padding: 0.4rem 0.75rem;
    border-radius: 5px;
    transition: background 0.3s;
    font-size: 0.9rem;
    white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
    background: rgba(255,255,255,0.2);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

h1 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid #3498db;
}

h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

/* Form Card */
.form-card {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #2c3e50;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e1e8ed;
}

.form-section h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
}

.btn-primary {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2980b9, #1f6dad);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.4);
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

.btn-danger {
    background: #e74c3c;
    color: white;
}

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

.btn-success {
    background: linear-gradient(135deg, #27ae60, #229954);
    color: white;
}

.btn-success:hover {
    background: linear-gradient(135deg, #229954, #1e8449);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(39, 174, 96, 0.4);
}

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.2rem;
}

.form-actions {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.data-table th,
.data-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #e1e8ed;
}

.data-table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #2c3e50;
}

.data-table tbody tr:hover {
    background: #f8f9fa;
}

.data-table tfoot {
    background: #f8f9fa;
    font-weight: 600;
}

/* Materials Header */
.materials-header {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.materials-header select {
    flex: 2;
    padding: 0.75rem;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
}

.materials-header input {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
}

/* Attachments */
.attachment-area {
    border: 2px dashed #e1e8ed;
    padding: 2rem;
    text-align: center;
    border-radius: 8px;
    background: #f8f9fa;
}

.attachment-area input[type="file"] {
    margin-bottom: 0.5rem;
}

.help-text {
    color: #7f8c8d;
    font-size: 0.9rem;
}

.attachment-list {
    list-style: none;
    margin-top: 1rem;
}

.attachment-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: #f8f9fa;
    border-radius: 5px;
    margin-bottom: 0.5rem;
}

.attachment-list li span {
    color: #2c3e50;
}

/* Messages */
.message {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.message-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: #95a5a6;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal h3 {
    margin-bottom: 1rem;
    color: #2c3e50;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 0.5rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-links a {
        font-size: 0.8rem;
        padding: 0.35rem 0.6rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .materials-header {
        flex-direction: column;
    }

    .materials-header select,
    .materials-header input {
        width: 100%;
    }

    .form-actions {
        flex-direction: column;
    }

    .data-table {
        font-size: 0.85rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.5rem;
    }
}