/* LCDL 样式表 - 轻量级猫娘风格 - 移动端优化版 */
:root {
    --primary-color: #ff9ed8;
    --secondary-color: #b8a1d5;
    --accent-color: #ff6b9d;
    --background-color: #fff9fd;
    --text-color: #5a4a68;
    --light-color: #fff0f7;
    --border-color: #f0d5e3;
    --shadow: 0 4px 12px rgba(255, 155, 215, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    background-image: 
        radial-gradient(var(--primary-color) 1px, transparent 1px),
        radial-gradient(var(--secondary-color) 1px, transparent 1px);
    background-size: 40px 40px;
    background-position: 0 0, 20px 20px;
    opacity: 0.95;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: "(=^･ω･^=)";
    position: absolute;
    font-size: 1.5rem;
    opacity: 0.1;
    top: 10px;
    right: 10px;
}

.header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
    padding: 0 10px;
}

.subtitle {
    display: block;
    font-size: 1.5rem;
    font-weight: normal;
    margin-top: 0.5rem;
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.9;
    padding: 0 10px;
}

.cat-ears {
    color: var(--accent-color);
    margin-left: 5px;
}

/* 导航样式 - 移动端优化 */
.navigation {
    background: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.navigation::-webkit-scrollbar {
    display: none;
}

.navigation ul {
    display: flex;
    list-style: none;
    padding: 0 8px;
    min-width: min-content;
    white-space: nowrap;
}

.navigation li {
    margin: 0;
    flex-shrink: 0;
}

.navigation a {
    display: block;
    padding: 0.8rem 1rem;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    font-size: 0.9rem;
}

.navigation a:hover {
    color: var(--accent-color);
    background: var(--light-color);
}

.navigation a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--accent-color);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.navigation a:hover::after {
    width: 70%;
}

/* 主要内容区域 */
main {
    padding: 2rem 0;
}

.section {
    margin-bottom: 2.5rem;
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.section h2 {
    color: var(--accent-color);
    margin-bottom: 1.2rem;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.cat-icon {
    font-size: 1.3rem;
}

.content-box {
    line-height: 1.7;
}

.highlight-box {
    background: var(--light-color);
    border-left: 4px solid var(--primary-color);
    padding: 1.2rem;
    margin: 1.2rem 0;
    border-radius: 0 8px 8px 0;
}

.highlight-box h3 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.cat-note {
    font-style: italic;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--border-color);
}

/* 原则网格 - 移动端优化 */
.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.2rem;
    margin-top: 1.5rem;
}

.principle-card {
    background: var(--light-color);
    padding: 1.2rem;
    border-radius: 8px;
    text-align: center;
    transition: transform 0.3s ease;
    border: 1px solid var(--border-color);
}

.principle-card:hover {
    transform: translateY(-3px);
}

.principle-card h3 {
    color: var(--accent-color);
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
}

/* 元素分类 */
.element-category {
    margin-bottom: 2rem;
}

.element-category h3 {
    color: var(--secondary-color);
    margin-bottom: 1.2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    font-size: 1.3rem;
}

.element-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.2rem;
}

.element-item {
    background: var(--light-color);
    padding: 1.2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.element-item h4 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.example {
    margin-top: 0.8rem;
    padding: 0.7rem;
    background: white;
    border-radius: 6px;
    font-style: italic;
    border-left: 3px solid var(--primary-color);
    font-size: 0.9rem;
}

.action {
    color: var(--accent-color);
    font-weight: 500;
}

/* 例句对比 - 移动端优化 */
.example-comparison {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.comparison-item {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.normal-version, .lcdl-version {
    padding: 1.2rem;
    border-radius: 8px;
    flex: 1;
}

.normal-version {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
}

.lcdl-version {
    background: var(--light-color);
    border: 1px solid var(--primary-color);
}

.normal-version h4, .lcdl-version h4 {
    margin-bottom: 0.7rem;
    font-size: 1rem;
}

.normal-version h4 {
    color: #6c757d;
}

.lcdl-version h4 {
    color: var(--accent-color);
}

/* 技巧网格 - 移动端优化 */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.2rem;
}

.tip-card {
    background: var(--light-color);
    padding: 1.2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.tip-card h3 {
    color: var(--accent-color);
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
}

/* 高级内容 - 移动端优化 */
.advanced-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.advanced-tips ul {
    list-style: none;
    padding-left: 0;
}

.advanced-tips li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
}

.advanced-tips li::before {
    content: "🐾";
    position: absolute;
    left: 0;
}

.faq-item {
    margin-bottom: 1.2rem;
    padding-bottom: 1.2rem;
    border-bottom: 1px solid var(--border-color);
}

.faq-item h4 {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

/* 页脚 */
.footer {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 2rem;
}

.copyright {
    margin-top: 0.8rem;
    opacity: 0.8;
    font-size: 0.85rem;
}

/* 响应式设计 - 优化移动端体验 */
@media (max-width: 768px) {
    .container {
        padding: 0 12px;
    }
    
    .header {
        padding: 1.5rem 0;
    }
    
    .header h1 {
        font-size: 1.7rem;
    }
    
    .subtitle {
        font-size: 1.3rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .section {
        padding: 1.2rem;
        margin-bottom: 2rem;
        border-radius: 10px;
    }
    
    .section h2 {
        font-size: 1.3rem;
    }
    
    .principles-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .element-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .example {
        font-size: 0.85rem;
        padding: 0.6rem;
    }
    
    .highlight-box {
        padding: 1rem;
    }
    
    .navigation a {
        padding: 0.7rem 0.8rem;
        font-size: 0.85rem;
    }
}

/* 超小屏幕优化 */
@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    .section {
        padding: 1rem;
        border-radius: 8px;
    }
    
    .section h2 {
        font-size: 1.2rem;
    }
    
    .principle-card, .element-item, .tip-card {
        padding: 1rem;
    }
    
    .normal-version, .lcdl-version {
        padding: 1rem;
    }
    
    .navigation a {
        padding: 0.6rem 0.7rem;
        font-size: 0.8rem;
    }
}

/* 动画效果 */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.cat-icon {
    animation: float 3s ease-in-out infinite;
}

.principle-card:hover .cat-icon {
    animation-duration: 1s;
}

/* 改进滚动条体验 */
@media (hover: none) {
    .principle-card:hover {
        transform: none;
    }
    
    .navigation a:hover {
        background: transparent;
        color: var(--text-color);
    }
    
    .navigation a:hover::after {
        width: 0;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .navigation a {
        padding: 0.9rem 1rem; /* 增大触摸目标 */
    }
    
    .element-item, .principle-card, .tip-card {
        cursor: default; /* 移除悬停效果 */
    }
}