/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", "SimSun", serif;
}

body {
    background-color: #FFF8F0; /* 浅橘黄底色，读书风 */
    color: #5A3E2B; /* 深棕色文字，贴合读书风格 */
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 0;
}

/* 头部 */
.header {
    background-color: #F9A825; /* 主橘黄色 */
    padding: 15px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo {
    color: white;
    font-size: 2.5rem;
    text-align: center;
    font-weight: bold;
    letter-spacing: 2px;
}

/* 品牌介绍区 */
.intro-section {
    padding: 60px 0;
    text-align: center;
    border-bottom: 1px solid #F5D76E;
}

.slogan {
    font-size: 2rem;
    color: #E67E22; /* 橘红色 */
    margin-bottom: 30px;
    font-weight: 600;
}

.intro-text {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.qrcode-section {
    margin-top: 30px;
}

.qrcode-img {
    width: 200px;
    height: 200px;
    border: 5px solid #F9A825;
    border-radius: 10px;
}

/* 图书展示区 */
.book-section {
    padding: 60px 0;
    border-bottom: 1px solid #F5D76E;
}

.section-title {
    font-size: 1.8rem;
    color: #E67E22;
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

    .section-title::after {
        content: "";
        display: block;
        width: 80px;
        height: 3px;
        background-color: #F9A825;
        margin: 10px auto 0;
    }

.book-card {
    display: flex;
    align-items: center;
    gap: 40px;
    max-width: 900px;
    margin: 0 auto;
    background-color: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.book-cover {
    width: 250px;
    height: 350px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 5px 10px rgba(0,0,0,0.2);
}

.book-info {
    flex: 1;
}

    .book-info h3 {
        font-size: 1.5rem;
        color: #E67E22;
        margin-bottom: 20px;
    }

.book-desc {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #666;
}

.buy-btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: #F9A825;
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-weight: 600;
    transition: background-color 0.3s;
}

    .buy-btn:hover {
        background-color: #E67E22;
    }

/* APP展示区 */
.app-section {
    padding: 60px 0;
    border-bottom: 1px solid #F5D76E;
}

.app-card {
    display: flex;
    align-items: center;
    gap: 40px;
    max-width: 900px;
    margin: 0 auto;
    background-color: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.app-info {
    flex: 1;
}

    .app-info h3 {
        font-size: 1.5rem;
        color: #E67E22;
        margin-bottom: 20px;
    }

.app-desc {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #666;
}

.app-qrcode {
    text-align: center;
}

/* 页脚 */
.footer {
    background-color: #F9A825;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
}


/* 原有样式保留，新增以下核心概念样式 */
.core-concepts {
    display: flex;
    gap: 30px;
    max-width: 900px;
    margin: 0 auto 40px;
    flex-wrap: wrap; /* 适配移动端 */
}

.concept-card {
    flex: 1;
    min-width: 300px; /* 移动端最小宽度 */
    background: linear-gradient(135deg, #FFF9F0 0%, #FFE8C8 100%);
    padding: 35px 25px;
    border-radius: 16px;
    box-shadow: 0 8px 20px rgba(249, 168, 37, 0.15);
    border: 1px solid #F5D76E;
    position: relative;
    overflow: hidden;
}

/* 蜜字卡片专属装饰 */
.honey-card::before {
    content: "";
    position: absolute;
    top: -20px;
    right: -20px;
    width: 80px;
    height: 80px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23F9A82533'%3E%3Cpath d='M12 2a8 8 0 0 0-8 8c0 3.15 1.86 5.88 4.41 7.14-.15-.84-.25-1.73-.25-2.64 0-6.08 4.92-11 11-11h2c0-5.52-4.48-10-10-10zm0 18c-2.67 0-8-1.34-8-4 0-1.7.83-3.22 2.11-4.19C7.21 11.94 8.85 13 11 13v-2c-1.78 0-3.27-.85-4.16-2.14-.22-.34-.67-.4-1-.14-.33.26-.41.72-.14 1.05.98 1.46 2.68 2.38 4.5 2.38V8c-2.05 0-3.81-.98-4.83-2.42-.38-.56-.28-1.33.21-1.74.49-.41 1.27-.31 1.74.21C8.46 6.53 10.12 7 12 7c2.76 0 5-2.24 5-5h2c0 3.87-3.13 7-7 7z'/%3E%3C/svg%3E") no-repeat;
    background-size: contain;
    opacity: 0.6;
    z-index: 0;
}

/* 聊字卡片专属装饰 */
.chat-card::before {
    content: "";
    position: absolute;
    top: -20px;
    right: -20px;
    width: 80px;
    height: 80px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23E67E2233'%3E%3Cpath d='M20 2H4c-1.1 0-1.99.9-1.99 2L2 22l4-4h14c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm-2 12H6v-2h12v2zm0-3H6V9h12v2zm0-3H6V6h12v2z'/%3E%3C/svg%3E") no-repeat;
    background-size: contain;
    opacity: 0.6;
    z-index: 0;
}

.concept-title {
    font-size: 3.5rem;
    color: #E67E22;
    margin-bottom: 15px;
    font-weight: 700;
    position: relative;
    z-index: 1;
    line-height: 1;
}

.honey-card .concept-title {
    color: #F9A825;
}

.concept-desc {
    font-size: 1.15rem;
    line-height: 1.8;
    color: #5A3E2B;
    position: relative;
    z-index: 1;
    text-align: left;
    padding-left: 10px;
    border-left: 3px solid #F9A825;
}

.chat-card .concept-desc {
    border-left-color: #E67E22;
}

/* 响应式适配（移动端） */
@media (max-width: 768px) {
    .core-concepts {
        flex-direction: column;
        gap: 20px;
    }

    .concept-title {
        font-size: 2.8rem;
    }

    .concept-desc {
        font-size: 1rem;
    }
}