:root {
    --primary-color: #1a1a1a;
    --secondary-color: #4a4a4a;
    --accent-color: #808080;
    --silver-light: #f0f0f0;
    --silver: #c0c0c0;
    --silver-dark: #a0a0a0;
    --white: #ffffff;
    --gradient-start: #ffffff;
    --gradient-end: #d8d8d8;
    --shadow-color: rgba(0, 0, 0, 0.15);
}

body {
    margin: 0;
    padding: 0;
    font-family: "微軟正黑體", sans-serif;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end), var(--silver));
    min-height: 100vh;
    color: var(--primary-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
}

main {
    flex: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

h1 {
    font-size: 3.5rem;
    text-align: center;
    width: 100%;
    color: var(--primary-color);
    text-shadow: 
        3px 3px 6px rgba(0,0,0,0.3),
        -1px -1px 0 var(--white),
        2px 2px 0 var(--silver-dark),
        2px 2px 8px rgba(0,0,0,0.4);
    letter-spacing: 3px;
    animation: titleFloat 3s ease-in-out infinite;
    margin-bottom: 1rem;
    padding: 1rem;
    background: linear-gradient(90deg, #2C3E50, #34495E);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
    font-weight: 900;
}

h2 {
    color: var(--secondary-color);
    font-size: 2rem;
    margin-bottom: 2rem;
    text-shadow: 1px 1px 2px var(--shadow-color);
    position: relative;
    animation: slideInFromTop 0.8s ease;
}

.content-section {
    width: 80%;
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, var(--white), var(--silver-light));
    border-radius: 20px;
    padding: 3rem 2rem;
    box-shadow: 
        0 10px 20px var(--shadow-color),
        0 4px 8px var(--shadow-color),
        inset 0 0 100px rgba(255,255,255,0.5);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255,255,255,0.6);
    backdrop-filter: blur(10px);
    position: relative;
}

.content-section:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 15px 30px var(--shadow-color),
        0 8px 16px var(--shadow-color),
        inset 0 0 100px rgba(255,255,255,0.7);
}

.item {
    width: 100%;
    max-width: 300px;
    height: auto;
    min-height: 80px;
    padding: 1.5rem;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(145deg, var(--white), var(--silver-light));
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255,255,255,0.8);
    box-shadow: 
        0 4px 8px var(--shadow-color),
        inset 0 0 20px rgba(255,255,255,0.5);
    position: relative;
    overflow: hidden;
}

.item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        120deg,
        transparent,
        rgba(255,255,255,0.3),
        transparent
    );
    transition: 0.5s;
}

.item:hover::before {
    left: 50%;
}

.item:hover {
    transform: translateY(-8px) scale(1.03);
    background: linear-gradient(145deg, var(--white), var(--silver));
    box-shadow: 
        0 12px 24px var(--shadow-color),
        inset 0 0 30px rgba(255,255,255,0.8);
}

.pdf-icon, .pdf-title {
    width: 100%;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

.pdf-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    transition: all 0.3s ease;
    animation: iconPulse 2s infinite;
}

.pdf-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--secondary-color);
    transition: all 0.3s ease;
    text-shadow: 1px 1px 1px rgba(255,255,255,0.8);
}

.item:hover .pdf-icon,
.item:hover .pdf-title {
    color: var(--primary-color);
}

.back-button {
    margin: 0 auto 2rem auto;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(145deg, var(--white), var(--silver-light));
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--secondary-color);
    transition: all 0.3s ease;
    box-shadow: 
        0 4px 8px var(--shadow-color),
        inset 0 0 20px rgba(255,255,255,0.5);
    border: 1px solid rgba(255,255,255,0.6);
}

.back-button:hover {
    transform: translateY(-3px);
    background: linear-gradient(145deg, var(--silver-light), var(--silver));
    color: var(--primary-color);
    box-shadow: 
        0 8px 16px var(--shadow-color),
        inset 0 0 30px rgba(255,255,255,0.8);
}

.back-button .arrow {
    font-size: 1.2rem;
}

.item-list {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.hidden {
    display: none;
}

/* 增強動畫效果 */
.fade-in {
    opacity: 0;
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes titleFloat {
    0% { 
        transform: translateY(0) rotate(0deg); 
        text-shadow: 
            3px 3px 6px rgba(0,0,0,0.3),
            -1px -1px 0 var(--white),
            2px 2px 0 var(--silver-dark),
            4px 4px 0 rgba(0,0,0,0.1);
    }
    25% { 
        transform: translateY(-10px) rotate(1deg); 
        text-shadow: 
            4px 4px 8px rgba(0,0,0,0.4),
            -1px -1px 0 var(--white),
            3px 3px 0 var(--silver-dark),
            5px 5px 0 rgba(0,0,0,0.15);
    }
    75% { 
        transform: translateY(5px) rotate(-1deg); 
        text-shadow: 
            2px 2px 4px rgba(0,0,0,0.2),
            -1px -1px 0 var(--white),
            1px 1px 0 var(--silver-dark),
            3px 3px 0 rgba(0,0,0,0.05);
    }
    100% { 
        transform: translateY(0) rotate(0deg); 
        text-shadow: 
            3px 3px 6px rgba(0,0,0,0.3),
            -1px -1px 0 var(--white),
            2px 2px 0 var(--silver-dark),
            4px 4px 0 rgba(0,0,0,0.1);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 麵包屑導航 */
#breadcrumb {
    width: 100%;
    max-width: 900px;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 2rem auto;
    padding: 1rem;
    background: linear-gradient(90deg, rgba(255,255,255,0.9), rgba(245,245,245,0.9));
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow-color);
    animation: slideIn 0.5s ease;
}

#breadcrumb a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: all 0.3s ease;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
}

#breadcrumb a:hover {
    color: var(--primary-color);
    background: rgba(0,0,0,0.05);
}

@keyframes slideIn {
    from {
        transform: translateX(-20px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 新增動畫效果 */
@keyframes iconPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

@keyframes slideInFromTop {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shimmer {
    0% { background-position: -200% center; }
    100% { background-position: 200% center; }
}

/* 響應式設計優化 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .item {
        padding: 1.5rem;
    }
    
    .back-button {
        padding: 0.8rem 1.5rem;
    }
    
    .item-list {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
    }
}

.item span {
    font-size: 1.3rem;
    font-weight: 600;
}

/* 首頁說明區域樣式 */
.description-box {
    width: 100%;
    max-width: 800px;
    margin: 0 auto 2rem auto;
    padding: 2rem;
    background: linear-gradient(145deg, var(--white), var(--silver-light));
    border-radius: 15px;
    box-shadow: 
        0 4px 8px var(--shadow-color),
        inset 0 0 20px rgba(255,255,255,0.5);
    border: 1px solid rgba(255,255,255,0.8);
    text-align: cen;
    min-height: 200px; /* 可根據需要調整 */
}

.description-content {
    color: var(--secondary-color);
    line-height: 1.6;
    font-size: 1.1rem;
}

/* 開始瀏覽按鈕樣式 */
.start-button {
    background: linear-gradient(145deg, var(--white), var(--silver-light));
    border: none;
    padding: 1.2rem 2.5rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.3rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 4px 8px var(--shadow-color),
        inset 0 0 20px rgba(255,255,255,0.5);
    border: 1px solid rgba(255,255,255,0.8);
    margin: 2rem auto;
    position: relative;
    overflow: hidden;
}

.start-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: 100%;
    background: linear-gradient(
        120deg,
        transparent,
        rgba(255,255,255,0.3),
        transparent
    );
    transition: 0.5s;
}

.start-button:hover::before {
    left: 50%;
}

.start-button:hover {
    transform: translateY(-5px) scale(1.02);
    background: linear-gradient(145deg, var(--silver-light), var(--silver));
    box-shadow: 
        0 8px 16px var(--shadow-color),
        inset 0 0 30px rgba(255,255,255,0.8);
}

.button-text {
    font-weight: 600;
    letter-spacing: 1px;
}

.button-icon {
    font-size: 1.4rem;
    transition: transform 0.3s ease;
}

.start-button:hover .button-icon {
    transform: translateX(5px);
}

/* 確保 header 置中 */
header {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
}

/* 說明按鈕樣式 */
.info-button {
    margin-top: 1rem;
    padding: 0.8rem 2rem;
    background: linear-gradient(145deg, var(--white), var(--silver-light));
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--secondary-color);
    transition: all 0.3s ease;
    box-shadow: 
        0 4px 8px var(--shadow-color),
        inset 0 0 20px rgba(255,255,255,0.5);
    border: 1px solid rgba(255,255,255,0.6);
}

.info-button:hover {
    transform: translateY(-3px);
    background: linear-gradient(145deg, var(--silver-light), var(--silver));
    color: var(--primary-color);
    box-shadow: 
        0 8px 16px var(--shadow-color),
        inset 0 0 30px rgba(255,255,255,0.8);
}

/* 彈出視窗樣式 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: linear-gradient(145deg, var(--white), var(--silver-light));
    padding: 2rem;
    border-radius: 20px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    position: relative;
    box-shadow: 
        0 10px 20px var(--shadow-color),
        0 4px 8px var(--shadow-color);
    overflow-y: auto;
}

.close-button {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--secondary-color);
    transition: all 0.3s ease;
}

.close-button:hover {
    color: var(--primary-color);
    transform: scale(1.1);
}

.info-content {
    margin-top: 1rem;
    text-align: left;
    line-height: 1.6;
}

.info-content h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.info-content p {
    margin-bottom: 1rem;
}

.info-content ul, .info-content ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

.info-content li {
    margin-bottom: 0.5rem;
}

.audio-button-container {
    margin-top: 20px;
    text-align: center;
}

.audio-button {
    background-color: #5b5b5b;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.3s;
}

.audio-button:hover {
    background-color: #9f9f9f;
}

.audio-icon {
    font-size: 20px;
}