:root {
    --primary: #2c3e50;
    --accent: #3498db;
    --bg: #f4f7f6;
}

body {
    font-family: 'Segoe UI', sans-serif;
    background: var(--bg);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.header {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    margin-bottom: 20px;
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
}

.current-label {
    font-size: 1.5rem;
    font-weight: bold;
    min-width: 220px;
    text-align: center;
}

.calendar-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 1100px;
    overflow: hidden;
}

.grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
}

.day-header {
    background: #f8f9fa;
    padding: 15px;
    text-align: center;
    font-weight: bold;
    color: #777;
    border-bottom: 1px solid #eee;
}

.day {
    min-height: 120px;
    border-right: 1px solid #f0f0f0;
    border-bottom: 1px solid #f0f0f0;
    padding: 10px;
}

.day-num {
    font-weight: bold;
    margin-bottom: 8px;
}

.task {
    background: var(--accent);
    color: white;
    font-size: 0.75rem;
    padding: 4px 8px;
    border-radius: 4px;
    margin-bottom: 4px;
}