/* Basic styles */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1rem;
}

main {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

#left-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#calendar-container {
    background: white;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.calendar-header button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
}

.calendar-header button:hover {
    background-color: #0056b3;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background-color: #ddd;
}

.day-name {
    background-color: #333;
    color: white;
    padding: 1rem;
    text-align: center;
    font-weight: bold;
}

.calendar-day {
    background: white;
    padding: 0.5rem;
    text-align: center;
    min-height: 60px;
    cursor: pointer;
    border: 1px solid #eee;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
}

.calendar-day:hover {
    background-color: #f0f0f0;
}

.calendar-day.selected {
    background-color: #e3f2fd;
    border: 2px solid #007bff;
}

.calendar-day.has-plans {
    background-color: #fff3cd;
}

.calendar-day.has-plans:hover {
    background-color: #ffeaa7;
}

.calendar-day.today {
    background-color: #d4edda;
    font-weight: bold;
}

.calendar-day.today:hover {
    background-color: #c3e6cb;
}

#daily-plans-container {
    background: white;
    border-radius: 8px;
    padding: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#monthly-plans-container {
    background: white;
    border-radius: 8px;
    padding: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-top: 1rem;
}

#right-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#monthly-plans-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.monthly-plan-item {
    padding: 0.75rem;
    border-radius: 4px;
    border-left: 4px solid;
    background-color: #f8f9fa;
}

/* 新增：狀態底色 */
.monthly-plan-item.normal {
    background-color: #d4edda; /* 淺綠 - 正常 */
}

.monthly-plan-item.soon-due {
    background-color: #fff3cd; /* 淺黃 - 即將到期 */
}

.monthly-plan-item.overdue {
    background-color: #f8d7da; /* 淺紅 - 已過期 */
}

.monthly-plan-item time {
    font-weight: bold;
    color: #666;
}

#daily-plans-container h2 {
    margin-top: 0;
}

#daily-plans-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.plan-item {
    padding: 0.75rem;
    border-radius: 4px;
    border-left: 4px solid;
    background-color: #f8f9fa;
}

.plan-item time {
    font-weight: bold;
    color: #666;
}

footer {
    text-align: center;
    padding: 1rem;
    background-color: #333;
    color: white;
    margin-top: 1rem;
}

/* Responsive design */
@media (min-width: 768px) {
    main {
        flex-direction: row;
        gap: 1rem;
    }
    
    #left-panel {
        flex: 1;
        gap: 1rem;
    }
    
    #right-panel {
        flex: 1;
        gap: 1rem;
    }
    
    #monthly-plans-container {
        margin-top: 0;
    }
    
    .calendar-day {
        min-height: 80px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .calendar-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .calendar-day {
        min-height: 50px;
        padding: 0.25rem;
        font-size: 0.8rem;
    }
}