/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-red: #d32f2f;
    --primary-red-dark: #b71c1c;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --holiday-bg: #ffebee;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

body {
    font-family: 'PingFang TC', 'Microsoft YaHei', 'Microsoft JhengHei', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--primary-red-dark) 100%);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.95;
}

/* Navigation Styles */
nav {
    background-color: var(--white);
    padding: 30px 0;
    border-bottom: 2px solid var(--primary-red);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

#currentYear {
    font-size: 2rem;
    color: var(--primary-red);
    font-weight: 700;
}

.nav-btn {
    background: none;
    border: 2px solid var(--primary-red);
    color: var(--primary-red);
    padding: 10px 20px;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
}

.nav-btn:hover {
    background-color: var(--primary-red);
    color: var(--white);
    transform: translateY(-2px);
}

/* Year Overview Styles */
.year-overview {
    padding: 60px 0;
    background-color: var(--bg-light);
}

.year-overview h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 40px;
}

.year-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.month-card {
    background: var(--white);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.month-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.month-card-title {
    font-size: 1.3rem;
    color: var(--primary-red);
    margin-bottom: 10px;
    font-weight: 600;
}

.month-card-info {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Monthly Calendars Styles */
.monthly-calendars {
    padding: 60px 0;
}

.month-selector {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 40px;
}

.month-nav-btn {
    background: none;
    border: 2px solid var(--primary-red);
    color: var(--primary-red);
    padding: 8px 16px;
    font-size: 0.9rem;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
}

.month-nav-btn:hover {
    background-color: var(--primary-red);
    color: var(--white);
}

#monthSelect {
    padding: 10px 20px;
    border: 2px solid var(--primary-red);
    border-radius: 5px;
    font-size: 1rem;
    color: var(--text-dark);
    cursor: pointer;
    background-color: var(--white);
    font-weight: 600;
}

.calendar-wrapper {
    background: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow);
    padding: 30px;
    margin-bottom: 40px;
}

.calendar-month {
    margin-bottom: 30px;
}

.calendar-header {
    text-align: center;
    margin-bottom: 30px;
}

.calendar-header h2 {
    font-size: 2rem;
    color: var(--primary-red);
    margin-bottom: 10px;
}

.calendar-header p {
    color: var(--text-light);
    font-size: 1.1rem;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 10px;
    margin-top: 20px;
}

.weekday {
    text-align: center;
    font-weight: 700;
    color: var(--primary-red);
    padding: 15px 0;
    background-color: var(--bg-light);
    border-radius: 5px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--white);
}

.calendar-day:hover {
    border-color: var(--primary-red);
    transform: scale(1.05);
}

.calendar-day.other-month {
    opacity: 0.3;
    background-color: var(--bg-light);
}

.calendar-day.holiday {
    background-color: var(--holiday-bg);
    border-color: var(--primary-red);
    color: var(--primary-red);
    font-weight: 700;
}

.day-number {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.day-lunar {
    font-size: 0.75rem;
    color: var(--text-light);
}

.holiday-name {
    font-size: 0.7rem;
    color: var(--primary-red);
    font-weight: 600;
    text-align: center;
    margin-top: 2px;
}

/* SEO Content Section */
.seo-content {
    padding: 60px 0;
    background-color: var(--bg-light);
}

.seo-content h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 30px;
}

.seo-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-dark);
    margin-bottom: 20px;
    text-align: justify;
}

/* Holidays List Section */
.holidays-list-section {
    padding: 60px 0;
    background-color: var(--white);
}

.holidays-list-section h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-red);
    margin-bottom: 40px;
}

.holidays-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.holiday-item {
    background: var(--bg-light);
    padding: 25px;
    border-radius: 10px;
    border-left: 5px solid var(--primary-red);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.holiday-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.holiday-date {
    font-size: 1.2rem;
    color: var(--primary-red);
    font-weight: 700;
    margin-bottom: 8px;
}

.holiday-name {
    font-size: 1.4rem;
    color: var(--text-dark);
    font-weight: 600;
    margin-bottom: 10px;
}

.holiday-description {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* Footer Styles */
footer {
    background-color: var(--text-dark);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
}

footer p {
    margin-bottom: 10px;
    font-size: 1rem;
}

footer a {
    color: var(--primary-red);
    text-decoration: none;
    font-weight: 600;
    transition: opacity 0.3s ease;
}

footer a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    #currentYear {
        font-size: 1.5rem;
    }
    
    .nav-btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
    
    .year-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .month-selector {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .month-nav-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
    
    #monthSelect {
        width: 100%;
        padding: 8px;
    }
    
    .calendar-wrapper {
        padding: 15px;
    }
    
    .calendar-header h2 {
        font-size: 1.5rem;
    }
    
    .calendar-grid {
        gap: 5px;
    }
    
    .day-number {
        font-size: 1rem;
    }
    
    .day-lunar {
        font-size: 0.65rem;
    }
    
    .holiday-name {
        font-size: 0.6rem;
    }
    
    .seo-content p {
        font-size: 1rem;
    }
    
    .holidays-list-section h2 {
        font-size: 1.5rem;
    }
    
    .holidays-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .year-grid {
        grid-template-columns: 1fr;
    }
    
    .calendar-day {
        padding: 5px;
    }
    
    .day-number {
        font-size: 0.9rem;
    }
    
    .day-lunar {
        font-size: 0.6rem;
    }
}