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

:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --danger-color: #ea4335;
    --warning-color: #fbbc04;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --border-color: #dadce0;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --hover-bg: #f1f3f4;
    --sidebar-width: 260px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-light);
    line-height: 1.6;
}

.container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-white);
    border-right: 1px solid var(--border-color);
    padding: 2rem 0;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.logo {
    padding: 0 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.logo h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

.nav-menu h3 {
    padding: 0 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.nav-item {
    width: 100%;
    padding: 0.875rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    text-align: left;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: var(--hover-bg);
    color: var(--text-primary);
}

.nav-item.active {
    background-color: #e8f0fe;
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.nav-item svg {
    flex-shrink: 0;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 2rem;
}

.content-header {
    background-color: var(--bg-white);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left {
    display: flex;
    gap: 1rem;
}

.btn-back, .btn-save {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-white);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-back:hover, .btn-save:hover {
    background-color: var(--hover-bg);
    border-color: var(--text-secondary);
}

.btn-save {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.btn-save:hover {
    background-color: #1a73e8;
    border-color: #1a73e8;
}

/* Sections */
.section {
    display: none;
}

.section.active {
    display: block;
}

.section-header {
    background-color: var(--bg-white);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.section-header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

.btn-add {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-add:hover {
    background-color: #1a73e8;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(66, 133, 244, 0.3);
}

/* Table */
.filters-container {
    background-color: var(--bg-white);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    display: flex;
    gap: 1.5rem;
    align-items: flex-end;
    flex-wrap: wrap;
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

.filter-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
}

.filter-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95rem;
    color: var(--text-primary);
    background-color: var(--bg-white);
    transition: all 0.2s ease;
    font-family: inherit;
}

.filter-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.1);
}

.btn-clear-filters {
    padding: 0.75rem 1.25rem;
    background-color: var(--bg-light);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-clear-filters:hover {
    background-color: var(--hover-bg);
    border-color: var(--text-secondary);
}

.table-container {
    background-color: var(--bg-white);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead th {
    text-align: left;
    padding: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border-color);
}

tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

tbody tr:hover {
    background-color: var(--hover-bg);
}

tbody td {
    padding: 1rem;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
}

.btn-edit, .btn-delete {
    padding: 0.5rem 0.875rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-edit {
    background-color: #e8f0fe;
    color: var(--primary-color);
}

.btn-edit:hover {
    background-color: #d2e3fc;
}

.btn-delete {
    background-color: #fce8e6;
    color: var(--danger-color);
}

.btn-delete:hover {
    background-color: #fad2cf;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.2s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--bg-white);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-modal {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.close-modal:hover {
    background-color: var(--hover-bg);
    color: var(--text-primary);
}

form {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.1);
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.btn-cancel, .btn-submit {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-cancel {
    background-color: var(--bg-light);
    color: var(--text-primary);
}

.btn-cancel:hover {
    background-color: var(--hover-bg);
}

.btn-submit {
    background-color: var(--primary-color);
    color: white;
}

.btn-submit:hover {
    background-color: #1a73e8;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(66, 133, 244, 0.3);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        transition: left 0.3s ease;
        z-index: 999;
    }

    .sidebar.open {
        left: 0;
    }

    .main-content {
        margin-left: 0;
    }

    .section-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .modal-content {
        width: 95%;
        margin: 1rem;
    }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state svg {
    opacity: 0.3;
    margin-bottom: 1rem;
}

.empty-state p {
    font-size: 1.1rem;
}

/* Master-Detail Container */
.master-detail-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.master-form {
    background-color: var(--bg-white);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-row .form-group {
    margin-bottom: 0;
}

.detail-section {
    background-color: var(--bg-white);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.detail-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.btn-add-detail {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-add-detail:hover {
    background-color: #2d9348;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(52, 168, 83, 0.3);
}

.section-header {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.section-header .btn-back {
    margin-right: auto;
}

.section-header h1 {
    flex: 1;
}

.section-header .btn-delete {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: 1px solid var(--danger-color);
    background-color: var(--bg-white);
    color: var(--danger-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.section-header .btn-delete:hover {
    background-color: var(--danger-color);
    color: white;
}