:root {
    --primary-bg: #001529;
    --sidebar-text: #rgba(255, 255, 255, 0.65);
    --sidebar-hover-bg: #1890ff;
    --header-bg: #fff;
    --main-bg: #f0f2f5;
    --text-color: #333;
    --border-color: #f0f0f0;
    --accent-color: #1890ff;
    --success-color: #52c41a;
    --warning-color: #faad14;
    --error-color: #f5222d;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
    background-color: var(--main-bg);
    color: var(--text-color);
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar Styling */
.sidebar {
    width: 200px;
    background-color: var(--primary-bg);
    color: #fff;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: all 0.3s;
}

.logo-container {
    height: 64px;
    display: flex;
    align-items: center;
    padding: 0 24px;
    font-size: 18px;
    font-weight: bold;
    color: #fff;
}

.menu {
    flex: 1;
    overflow-y: auto;
    padding: 16px 0;
}

.menu::-webkit-scrollbar {
    width: 4px;
}

.menu::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
}

.menu-item {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    cursor: pointer;
    transition: all 0.2s;
    color: rgba(255, 255, 255, 0.65);
    font-size: 14px;
}

.menu-item:hover {
    color: #fff;
}

.menu-item.active {
    background-color: var(--sidebar-hover-bg);
    color: #fff;
}

.menu-item i {
    margin-right: 12px;
    width: 16px;
    text-align: center;
}

.submenu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.submenu-list {
    background-color: #000c17;
    display: none;
}

.submenu-list.show {
    display: block;
}

.submenu-item {
    padding: 10px 24px 10px 48px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.65);
    cursor: pointer;
}

.submenu-item:hover {
    color: #fff;
}

.submenu-item.active {
    color: #fff;
    background-color: transparent;
}

/* Main Content Area */
.main-layout {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

header {
    height: 64px;
    background-color: var(--header-bg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    box-shadow: 0 1px 4px rgba(0, 21, 41, 0.08);
    position: relative;
    z-index: 10;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: #f0f2f5;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #e8e8e8;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%) opacity(0.8);
}

/* Tab Bar */
.tab-bar {
    background-color: #fff;
    padding: 0 16px;
    height: 40px;
    display: flex;
    align-items: center;
    gap: 4px;
    border-bottom: 1px solid var(--border-color);
}

.tab {
    padding: 0 16px;
    height: 32px;
    line-height: 32px;
    font-size: 12px;
    border: 1px solid var(--border-color);
    background: #fafafa;
    border-radius: 2px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}

.tab.active {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}

/* Content Container */
.content-wrapper {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
}

/* Card */
.card {
    background-color: #fff;
    border-radius: 2px;
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.card-title {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title::before {
    content: '';
    width: 3px;
    height: 16px;
    background-color: var(--accent-color);
}

/* Form layout */
.search-form {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
}

.form-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-item label {
    font-size: 14px;
    color: #666;
    white-space: nowrap;
}

input, select {
    padding: 4px 11px;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    height: 32px;
    outline: none;
}

input:focus {
    border-color: var(--accent-color);
}

/* Buttons */
.btn {
    padding: 4px 15px;
    border-radius: 2px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
    border: 1px solid var(--border-color);
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}

.btn-primary:hover {
    background-color: #40a9ff;
}

.btn-outline {
    background-color: #fff;
    color: #555;
}

.btn-outline:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.btn-success {
    background-color: var(--success-color);
    color: #fff;
    border-color: var(--success-color);
}

/* Table */
table {
    width: 100%;
    border-collapse: collapse;
}

th {
    background-color: #fafafa;
    text-align: left;
    padding: 16px;
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

tr:hover td {
    background-color: #fafafa;
}

/* Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
}

.switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--success-color);
}

input:checked + .slider:before {
    transform: translateX(22px);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.45);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.show {
    display: flex;
}

.modal {
    background: #fff;
    width: 500px;
    border-radius: 4px;
    overflow: hidden;
}

.modal-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 10px 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* Upload area */
.upload-dragger {
    border: 1px dashed var(--border-color);
    background: #fafafa;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: border-color .3s;
}

.upload-dragger:hover {
    border-color: var(--accent-color);
}

.upload-icon {
    font-size: 24px;
    color: var(--accent-color);
    margin-bottom: 10px;
}