/* 全域樣式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft JhengHei', 'PingFang TC', 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    position: relative;
}

.back-button {
    position: fixed;
    top: 20px;
    left: 20px;
    background: white;
    color: #667eea;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba( 0, 0, 0, 0.15);
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-button:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba( 0, 0, 0, 0.2);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

/* 頁首樣式 */
.page-header {
    background: linear-gradient(135deg, #5f72bd 0%, #9b59b6 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5em;
    font-weight: 700;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.header-decoration {
    width: 80px;
    height: 4px;
    background: white;
    margin: 0 auto;
    border-radius: 2px;
}

.subtitle {
    font-size: 1.1em;   
    margin-top: 10px;
    opacity: 0.95;
    font-weight: 400;
}

/* 內文樣式 */
.main-content {
    padding: 60px 30px;
    max-width: 900px;
    margin: 0 auto;
}

/* 頁尾樣式 */
.page-footer {
    background: #f8f9fa;
    padding: 20px;
    text-align: center;
    color: #6c757d;
    font-size: 0.9em;
    border-top: 1px solid #e9ecef;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .back-button {
        top: 10px;
        left: 10px;
        padding: 10px 18px;
        font-size: 0.9em;
    }

    .page-header {
        padding: 30px 20px;
    }

    .page-header h1 {
        font-size: 1.8em;
    }
}

@media (max-width: 480px) {
    .page-header h1 {
        font-size: 1.5em;
    }
}