:root {
    --bg-main: #f0f2f5;
    --bg-panel: #ffffff;
    --text-primary: #050505;
    --text-secondary: #65676b;
    --color-primary: #1877f2;
    --color-primary-hover: #166fe5;
    --border-color: #ced0d4;
    --sidebar-bg: #ffffff;
    --sidebar-active-bg: #e7f3ff;
    --sidebar-active-color: #1877f2;
    --sidebar-hover: #f2f2f2;
    --header-height: 56px;
    --sidebar-width: 240px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    overflow: hidden; /* Prevent full page scroll, handle scrolling in main content */
    margin: 0;
    padding: 0;
}

.bs-app-body {
    display: flex;
    height: calc(100vh - 60px); /* Account for 60px navbar */
    width: 100%;
}

/* Sidebar */
.bs-sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
    z-index: 100;
}

.bs-sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.bs-sidebar-header img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.bs-sidebar-header-text h1 {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.2;
}

.bs-sidebar-header-text p {
    font-size: 13px;
    color: var(--text-secondary);
}

.bs-sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 8px 8px;
}

.bs-nav-item {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    margin-bottom: 4px;
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.2s;
    cursor: pointer;
}

.bs-nav-item:hover {
    background-color: var(--sidebar-hover);
}

.bs-nav-item.active {
    background-color: var(--sidebar-active-bg);
    color: var(--sidebar-active-color);
}

.bs-nav-item i {
    width: 20px;
    margin-right: 12px;
    font-size: 18px;
    text-align: center;
    color: var(--text-secondary);
}

.bs-nav-item.active i {
    color: var(--sidebar-active-color);
}

.bs-sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--border-color);
}

/* Main Area Container */
.bs-main-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0; /* Important for flex children to allow shrinking */
}

/* Header */
.bs-header {
    height: var(--header-height);
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    flex-shrink: 0;
}

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

.bs-header-search {
    background-color: #f0f2f5;
    border-radius: 50px;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    width: 280px;
}

.bs-header-search i {
    color: var(--text-secondary);
    margin-right: 8px;
}

.bs-header-search input {
    border: none;
    background: transparent;
    outline: none;
    width: 100%;
    font-size: 14px;
}

.bs-header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.bs-btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: #e4e6eb;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 18px;
    color: var(--text-primary);
}

.bs-btn-icon:hover {
    background-color: #d8dade;
}

/* Main Content Area */
.bs-content-area {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.bs-page-header {
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.bs-page-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.bs-page-title img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.bs-page-title h1 {
    font-size: 24px;
    font-weight: 700;
}

.bs-page-title p {
    font-size: 14px;
    color: var(--text-secondary);
}

.bs-btn {
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
}

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

.bs-btn-primary:hover {
    background-color: var(--color-primary-hover);
}

.bs-btn-secondary {
    background-color: #e4e6eb;
    color: var(--text-primary);
}

.bs-btn-secondary:hover {
    background-color: #d8dade;
}

/* Cards / Panels */
.bs-card {
    background-color: var(--bg-panel);
    border-radius: 8px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    margin-bottom: 24px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.bs-card-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.bs-card-title {
    font-size: 16px;
    font-weight: 600;
}

.bs-card-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.bs-card-body {
    padding: 16px;
}

/* To-do List specifically */
.bs-todo-empty {
    background-color: #f7f8fa;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 16px;
    font-size: 14px;
    color: var(--text-primary);
}

/* Ad Preview Box */
.bs-ad-preview {
    display: flex;
    gap: 24px;
}

.bs-ad-controls {
    flex: 1;
}

.bs-ad-slider {
    margin: 24px 0;
}

.bs-ad-stats {
    flex: 1;
    background-color: #f0f2f5;
    border-radius: 8px;
    padding: 16px;
}

.bs-ad-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 16px;
}

.bs-stat-box {
    background-color: white;
    padding: 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.bs-stat-value {
    font-size: 20px;
    font-weight: 700;
    margin-top: 8px;
}

.bs-stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Range Slider */
input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
}
input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    margin-top: -6px;
}
input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: #ced0d4;
    border-radius: 2px;
}

/* Form Selects */
.bs-select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    background-color: white;
    outline: none;
}