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

:root {
    --primary: #D3E3FD;
    --primary-dark: #A8C7FA;
    --primary-text: #1E3A5F;
    --surface: #FFFFFF;
    --surface-variant: #F8F9FA;
    --outline: #E0E0E0;
    --text-primary: #202124;
    --text-secondary: #5F6368;
    --success: #34A853;
    --warning: #FBBC04;
    --info: #4285F4;
    --shadow-sm: 0 1px 2px rgba(60, 64, 67, 0.1);
    --shadow-md: 0 2px 8px rgba(60, 64, 67, 0.12);
    --shadow-lg: 0 4px 16px rgba(60, 64, 67, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--surface-variant);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    display: grid;
    grid-template-columns: 280px 1fr;
    grid-template-rows: 64px 1fr;
    height: 100vh;
    gap: 0;
}

/* Sidebar */
.sidebar {
    grid-row: 1 / 3;
    background: var(--surface);
    border-right: 1px solid var(--outline);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 8px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-text);
    font-weight: 700;
    font-size: 18px;
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.nav-item:hover {
    background: var(--surface-variant);
}

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

.nav-item .icon {
    font-size: 20px;
}

/* Header */
.header {
    background: var(--surface);
    border-bottom: 1px solid var(--outline);
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.search-bar {
    flex: 1;
    max-width: 600px;
    position: relative;
}

.search-bar input {
    width: 100%;
    padding: 10px 16px 10px 48px;
    border: 1px solid var(--outline);
    border-radius: 24px;
    font-size: 14px;
    font-family: inherit;
    background: var(--surface-variant);
    transition: all 0.2s ease;
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary-dark);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
}

.search-bar .icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 18px;
}

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

.icon-button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.icon-button:hover {
    background: var(--surface-variant);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667EEA, #764BA2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
}

/* Main Content */
.main-content {
    padding: 32px;
    overflow-y: auto;
}

.content-wrapper {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 24px;
}

.page-header {
    grid-column: 1 / -1;
    margin-bottom: 8px;
}

.page-title {
    font-size: 32px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

/* Summary Cards */
.summary-section {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--surface);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.stat-info h3 {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.stat-number {
    font-size: 36px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-card:nth-child(1) .stat-icon {
    background: rgba(66, 133, 244, 0.1);
    color: var(--info);
}

.stat-card:nth-child(2) .stat-icon {
    background: rgba(251, 188, 4, 0.1);
    color: var(--warning);
}

.stat-card:nth-child(3) .stat-icon {
    background: rgba(52, 168, 83, 0.1);
    color: var(--success);
}

.stat-footer {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 12px;
}

.trend {
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 500;
}

.trend.up {
    color: var(--success);
}

.trend.down {
    color: #EA4335;
}

/* Task List */
.task-section {
    grid-column: 1 / -1;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.section-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.filter-buttons {
    display: flex;
    gap: 8px;
}

.filter-btn {
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--outline);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-btn:hover {
    background: var(--surface-variant);
}

.filter-btn.active {
    background: var(--primary);
    color: var(--primary-text);
    border-color: var(--primary);
}

.task-list {
    background: var(--surface);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.task-item {
    padding: 20px 24px;
    border-bottom: 1px solid var(--outline);
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    gap: 20px;
    align-items: center;
    transition: background 0.2s ease;
}

.task-item:last-child {
    border-bottom: none;
}

.task-item:hover {
    background: var(--surface-variant);
}

.task-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--outline);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.task-checkbox:hover {
    border-color: var(--primary-dark);
}

.task-checkbox.checked {
    background: var(--success);
    border-color: var(--success);
    position: relative;
}

.task-checkbox.checked::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 14px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.task-details {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.task-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

.task-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

.task-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.task-meta-item .icon {
    font-size: 14px;
}

.status-badge {
    padding: 6px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
}

.status-badge.todo {
    background: rgba(66, 133, 244, 0.1);
    color: var(--info);
}

.status-badge.progress {
    background: rgba(251, 188, 4, 0.1);
    color: var(--warning);
}

.status-badge.completed {
    background: rgba(52, 168, 83, 0.1);
    color: var(--success);
}

.task-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667EEA, #764BA2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 12px;
}

.task-avatar:nth-child(2n) {
    background: linear-gradient(135deg, #F093FB, #F5576C);
}

.task-avatar:nth-child(3n) {
    background: linear-gradient(135deg, #4FACFE, #00F2FE);
}

/* FAB */
.fab {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: var(--primary-text);
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 100;
    font-size: 28px;
    font-weight: 300;
}

.fab:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(60, 64, 67, 0.2);
}

/* Scrollbar */
.main-content::-webkit-scrollbar {
    width: 8px;
}

.main-content::-webkit-scrollbar-track {
    background: transparent;
}

.main-content::-webkit-scrollbar-thumb {
    background: var(--outline);
    border-radius: 4px;
}

.main-content::-webkit-scrollbar-thumb:hover {
    background: #BDBDBD;
}

@media (max-width: 1024px) {
    .container {
        grid-template-columns: 72px 1fr;
    }

    .sidebar {
        padding: 24px 12px;
    }

    .logo-text, .nav-item span:not(.icon) {
        display: none;
    }

    .nav-item {
        justify-content: center;
    }
}