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

body {
    font-family: Segoe UI, Arial, sans-serif;
    background: #f3f5f7;
    color: #222;
}

.app {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 260px;
    background: #1f2937;
    color: white;
    padding: 20px;
    overflow-y: auto;
}

.logo {
    margin-bottom: 30px;
}

.logo h1 {
    font-size: 28px;
}

.menu-section {
    margin-bottom: 30px;
}

.menu-title {
    color: #9ca3af;
    font-size: 13px;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.menu-list {
    list-style: none;
}

.menu-list li {
    padding: 10px;
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 4px;
}

.menu-list li:hover {
    background: #374151;
}

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.toolbar {
    background: white;
    border-bottom: 1px solid #ddd;
    padding: 18px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.toolbar h2 {
    font-size: 24px;
}

.toolbar button {
    background: #2563eb;
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    cursor: pointer;
}

.toolbar button:hover {
    background: #1d4ed8;
}

.workspace {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.task-list {
    width: 380px;
    background: white;
    border-right: 1px solid #ddd;
    overflow-y: auto;
}

.task-details {
    flex: 1;
    background: #fafafa;
    overflow-y: auto;
}

.panel-title {
    padding: 15px 20px;
    font-weight: bold;
    border-bottom: 1px solid #ddd;
    background: #f9fafb;
}

.empty {
    padding: 40px;
    text-align: center;
    color: #666;
}

.task-item {
    padding: 15px 20px;
    border-bottom: 1px solid #eee;
    cursor: pointer;
}

.task-item:hover {
    background: #f3f4f6;
}