/* 全域設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft JhengHei", "Heiti TC", sans-serif;
}

body {
    min-height: 100vh;
    background: radial-gradient(circle at center, #e50012 0%, #c30c22 100%);
    color: white;
    overflow-x: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.background-overlay {
    position: fixed;
    top: 50;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('../images/bg.png') center center no-repeat;
    background-size: auto;
    opacity: 0.5;
    z-index: -1;
}

.container {
    width: 100%;
    max-width: 1100px;
    padding: 10px 10px 20px 10px;
    display: flex;
    flex-direction: column;
    align-items: center; /* 水平置中 */
}

/* 標題 */
.hero-header {
    margin-bottom: 30px;
    text-align: center;
}

.title-img {
    max-width: 100%;
    height: auto;
}

/* 引言 */
.intro {
    font-size: 24px;
    font-weight: bold;
    margin-top: -25px;
    margin-bottom: 50px;
    line-height: 1.5;
    max-width: 930px;
    text-align: left;
}

/* 內容 */
.main-content {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-bottom: 35px;
}

.content-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
}

.responsive-img {
    max-height: 565px;
    width: auto;
    margin-left: -115px;
    margin-top: -20px; 
}

.book-info {
    text-align: left;
}

.highlight-title {
    color: #ffff00;
    font-size: 3rem;
    margin-bottom: 10px;
    font-weight: bold;
}

.feature-list {
    list-style: none;
    margin-bottom: 35px;
}

.feature-list li {
    font-size: 1.8rem;
    color: #ffffff;
    font-weight: bold;
    line-height: 45px;
    display: flex;
    align-items: center;
}

.feature-list li::before {
    content: "●";
    color: #ffff00;
    margin-right: 10px;
    font-size: 0.8rem;
}

/* 按鈕 */
.btn-order {
    display: inline-block;
    padding: 15px 50px;
    background: rgba(0, 160, 233); /* 提高飽和度與不透明度 */
    color: white;
    text-decoration: none;
    font-size: 2.5rem;
    font-weight: bold;
    border-radius: 50px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(8px);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 8px 15px rgba(6, 100, 142, 0.5);
    letter-spacing: 2px;
}

.btn-order:hover {
    background: rgba(0, 153, 255, 1);
    transform: scale(1.1);
    box-shadow: 0 10px 20px rgba(6, 100, 142, 0.7);
}


.footer {
    width: 100%;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    padding-top: 30px;
    text-align: center;
}

.footer-text {
    font-size: 1.5rem;
    color: #ffffff;
    font-weight: 500;
    letter-spacing: 1px;
}

/* 動態效果 */
.fade-in-layer {
    opacity: 0;
    transform: translateY(40px);
    animation: fadeInUp 1s ease forwards;
}

.hero-header { animation-delay: 0.2s; }
.intro { animation-delay: 0.5s; }
.main-content { animation-delay: 0.8s; }
.footer { animation-delay: 1.1s; }

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


/* 手機版 */
@media (max-width: 850px) {

    .hero-header { animation-delay: 0.3s; }
    .intro { animation-delay: 0.5s; }
    .main-content { animation-delay: 0.7s; }
    .footer { animation-delay: 1s; } 

    .hero-header {
        margin-bottom: 20px;
        width: 100%;
    }

    .title-img {
        width: 100%; 
        max-width: none;
        height: auto;
    }

    .content-wrapper {
        flex-direction: column;
        gap: 30px;
    }
    
    .intro {
        font-size: 18px;
        margin-top: 0;
        padding: 0px 15px;
    }

    .highlight-title {
        font-size: 2rem;
    }


    .book-info {
        text-align: center;
        margin-top: -10px;
    }

    .feature-list {
        display: inline-block;
        text-align: left;
        margin: 0 auto 25px auto; /* 整個區塊置中 */
    }
    
    .feature-list li {
        justify-content: flex-start; /* 內容靠左 */
        font-size: 1.4rem;
        line-height: 35px;
    }

    .responsive-img {
        max-height: 350px;
        margin-left: -35px;
        margin-top: -25px;
    }

    .btn-order {
        font-size: 2rem;
        padding: 10px 40px;
    }

    .footer-text {
        font-size: 1.1rem;
        line-height: 25px;
    }
}