* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f5f7fa;
    padding: 20px;
}

:root {
    /* 浅色主题变量 */
    --background: #f5f7fa;
    --card-bg: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --accent-color: #4f46e5;
    --hover-bg: #f1f5f9;
    --border-color: #e2e8f0;
    --current-date-bg: #4f46e5;
    --current-date-text: #ffffff;
    --primary-gradient: linear-gradient(135deg, #4f46e5, #7c3aed);
}

@media (prefers-color-scheme: dark) {
    :root {
        /* 深色主题变量 */
        --background: #1a202c;
        --card-bg: #2d3748;
        --text-primary: #e2e8f0;
        --text-secondary: #a0aec0;
        --accent-color: #818cf8;
        --hover-bg: #2a3440;
        --border-color: #4a5568;
        --current-date-bg: #818cf8;
        --current-date-text: #ffffff;
        --primary-gradient: linear-gradient(135deg, #818cf8, #7e22ce);
    }
}

body {
    background-color: var(--background);
    color: var(--text-primary);
}

.calendar-container {
    background-color: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 380px;
    overflow: hidden;
    border-top: 6px solid transparent;
    border-image: var(--primary-gradient);
    border-image-slice: 1;
}

.calendar-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background-color: var(--card-bg);
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.nav-section {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-btn {
    background: none;
    border: none;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--hover-bg);
}

.nav-btn:hover {
    background-color: var(--border-color);
}

.current-month {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 10px;
    text-align: center;
}

.month-header {
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 1;
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    padding: 14px 0;
    font-size: 0.85rem;
    font-weight: 500;
    text-align: center;
    color: var(--text-secondary);
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
    padding: 16px;
    background-color: var(--card-bg);
}

.calendar-date {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    position: relative;
    user-select: none;
    transition: transform 0.2s;
}

.calendar-date:hover {
    background-color: var(--hover-bg);
    transform: scale(1.05);
}

.calendar-date.other-month {
    color: var(--text-secondary);
    opacity: 0.4;
}

.calendar-date.current-date {
    background-color: var(--current-date-bg);
    color: var(--current-date-text);
    font-weight: 600;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.calendar-date.event-date::after {
    content: "";
    position: absolute;
    bottom: 4px;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background-color: var(--accent-color);
}

.calendar-footer {
    padding: 16px 20px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
}

.notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--card-bg);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 50px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    font-size: 0.9rem;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    border: 1px solid var(--border-color);
}

.notification.show {
    opacity: 1;
}

.theme-toggle {
    background: var(--accent-color);
    color: white;
}

@media (max-width: 480px) {
    .calendar-container {
        max-width: 100%;
        border-radius: 12px;
    }
    
    .calendar-navigation {
        padding: 14px 18px;
    }
    
    .current-month {
        font-size: 1.1rem;
    }
}