/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 根变量定义 */
:root {
    /* 主色调 */
    --color-paper: #FAF6F0;
    --color-text: #121212;
    --color-accent: #9D7E69;
    --color-blue: #8CB4B6;
    --color-purple: #CAA9A6;
    
    /* 中性色 */
    --color-background: #FAF6F0;
    --color-card: #FFFFFF;
    --color-text-secondary: #555555;
    --color-text-light: #999999;
    --color-border: #E6E0D6;
    
    /* 暗黑模式 */
    --color-dark-bg: #1A1715;
    --color-dark-card: #24201D;
    --color-dark-text: #EAEAEA;
    --color-dark-accent: #B89F8E;
    
    /* 字体 */
    --font-heading-en: 'Lora', 'Inter', serif;
    --font-heading-zh: 'Noto Serif SC', serif;
    --font-body: 'Noto Serif SC', serif;
    
    /* 间距 */
    --spacing-base: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 80px;
    
    /* 圆角 */
    --border-radius: 16px;
    
    /* 阴影 */
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 暗黑模式 */
body.dark {
    --color-background: var(--color-dark-bg);
    --color-card: var(--color-dark-card);
    --color-text: var(--color-dark-text);
    --color-text-secondary: var(--color-dark-text);
    --color-text-light: rgba(234, 234, 234, 0.7);
    --color-border: rgba(255, 255, 255, 0.1);
    --color-accent: var(--color-dark-accent);
}

/* 基础样式 */
body {
    font-family: var(--font-body);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.8;
    transition: var(--transition);
    overflow-x: hidden;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(250, 246, 240, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow-soft);
}

body.dark .navbar.scrolled {
    background: rgba(26, 23, 21, 0.9);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand a {
    font-family: var(--font-heading-en);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    transition: var(--transition);
}

.navbar-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.navbar-menu a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: var(--transition);
}

.navbar-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-blue), var(--color-purple));
    transition: var(--transition);
    transform: translateX(-50%);
}

.navbar-menu a:hover::after,
.navbar-menu a.active::after {
    width: 100%;
}

.navbar-actions {
    display: flex;
    gap: var(--spacing-md);
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
}

/* Hero区 */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, var(--color-background), #F5F0E8);
    overflow: hidden;
}

body.dark .hero {
    background: linear-gradient(135deg, var(--color-dark-bg), var(--color-dark-card));
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="dots" width="10" height="10" patternUnits="userSpaceOnUse"><circle cx="5" cy="5" r="0.5" fill="%239D7E69" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23dots)"/></svg>');
    opacity: 0.3;
}

.hero .container {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-heading-zh);
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.text-gradient {
    background: linear-gradient(90deg, var(--color-accent), var(--color-blue), var(--color-purple));
    background-size: 200% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradientFlow 8s ease-in-out infinite;
}

@keyframes gradientFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.hero-slogan {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    animation: fadeInUp 1s ease-out 0.5s forwards;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    opacity: 0;
    animation: fadeInUp 1s ease-out 1s forwards;
}

/* 按钮样式 */
.btn {
    padding: 12px 32px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(90deg, var(--color-accent), var(--color-blue), var(--color-purple));
    background-size: 200% 100%;
    color: white;
    animation: gradientFlow 3s ease-in-out infinite;
}

.btn-primary:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    animation: gradientFlow 1s ease-in-out infinite;
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-card);
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

/* 滚动箭头 */
.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--color-text-secondary);
    animation: breathe 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 2px;
    height: 40px;
    background: var(--color-accent);
    margin: 10px auto 0;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 8px;
    height: 8px;
    border-left: 2px solid var(--color-accent);
    border-bottom: 2px solid var(--color-accent);
    transform: translateX(-50%) rotate(-45deg);
    animation: scrollDown 2s ease-in-out infinite;
}

@keyframes breathe {
    0%, 100% { opacity: 0.6; transform: translateX(-50%) translateY(0); }
    50% { opacity: 1; transform: translateX(-50%) translateY(-10px); }
}

@keyframes scrollDown {
    0% { opacity: 0; transform: translateX(-50%) translateY(0) rotate(-45deg); }
    50% { opacity: 1; transform: translateX(-50%) translateY(10px) rotate(-45deg); }
    100% { opacity: 0; transform: translateX(-50%) translateY(20px) rotate(-45deg); }
}

/* 精选书籍 */
.featured-books {
    padding: var(--spacing-xl) 0;
    background: var(--color-background);
}

.section-title {
    font-family: var(--font-heading-zh);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text);
}

.books-carousel {
    display: flex;
    gap: var(--spacing-lg);
    overflow-x: auto;
    padding: var(--spacing-md) 0;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.books-carousel::-webkit-scrollbar {
    display: none;
}

.book-card {
    flex: 0 0 280px;
    background: var(--color-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition);
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
}

.book-card:nth-child(1) { animation-delay: 0.1s; }
.book-card:nth-child(2) { animation-delay: 0.2s; }
.book-card:nth-child(3) { animation-delay: 0.3s; }
.book-card:nth-child(4) { animation-delay: 0.4s; }

.book-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.book-cover {
    height: 380px;
    overflow: hidden;
    position: relative;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.book-card:hover .book-cover img {
    transform: scale(1.05);
}

.book-title {
    font-family: var(--font-heading-zh);
    font-size: 1.25rem;
    margin: var(--spacing-md);
    color: var(--color-text);
}

.book-author {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin: 0 var(--spacing-md) var(--spacing-sm);
}

.book-desc {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin: 0 var(--spacing-md) var(--spacing-md);
}

/* 阅读理念 */
.reading-philosophy {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--color-background), #F5F0E8);
}

body.dark .reading-philosophy {
    background: linear-gradient(135deg, var(--color-dark-bg), var(--color-dark-card));
}

.philosophy-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.philosophy-text {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
}

.philosophy-text:nth-child(1) { animation-delay: 0.1s; }
.philosophy-text:nth-child(2) { animation-delay: 0.2s; }

/* 页脚 */
.footer {
    background: var(--color-card);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
}

body.dark .footer {
    background: var(--color-dark-card);
    border-top-color: var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.footer-brand h3 {
    font-family: var(--font-heading-en);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.footer-brand p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-social {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-social a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-social a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .navbar-menu {
        display: none;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .books-carousel {
        gap: var(--spacing-md);
    }
    
    .book-card {
        flex: 0 0 220px;
    }
    
    .book-cover {
        height: 300px;
    }
}