/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    color: #333;
    font-size: 16px;
    line-height: 1.6;
    background: linear-gradient(135deg, #f5f7fa, #e2e6ec);
    overflow-x: hidden;
}

/* 渐变主题色 */
:root {
    --primary-dark: #0D47A1;
    --primary-light: #1E88E5;
    --accent: #FF9800;
    --success: #388E3C;
    --dark: #212121;
    --light: #f8f9fa;
    --gradient-primary: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    --gradient-accent: linear-gradient(135deg, #FF9800, #FF5722);
    --gradient-success: linear-gradient(135deg, #388E3C, #4CAF50);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5em;
    color: var(--dark);
}

h1 {
    font-size: 2.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

h2 {
    font-size: 2rem;
    border-bottom: 2px solid #e6e6e6;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.5rem;
    color: var(--primary-dark);
}

p {
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}

/* 布局组件 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
    position: relative;
}

.dark-section {
    background: linear-gradient(135deg, #1a2a3a, #0D47A1);
    color: white;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

/* 卡片 */
.card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    overflow: hidden;
    height: 100%;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--primary-dark);
}

.card-image {
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 1rem;
}

.card-image img {
    width: 100%;
    height: auto;
    transition: transform 0.5s ease;
}

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

/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(13, 71, 161, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 6px 18px rgba(13, 71, 161, 0.6);
    transform: translateY(-3px);
}

.btn-accent {
    background: var(--gradient-accent);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 152, 0, 0.4);
}

.btn-accent:hover {
    box-shadow: 0 6px 18px rgba(255, 152, 0, 0.6);
    transform: translateY(-3px);
}

/* 特性区块 */
.feature-box {
    text-align: center;
    padding: 2rem;
    border-radius: var(--border-radius);
    background: white;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.feature-box:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    font-size: 2rem;
}

/* 轮播图 */
.carousel {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
}

.carousel-inner {
    display: flex;
    transition: transform 0.5s ease;
}

.carousel-item {
    flex: 0 0 100%;
    position: relative;
}

.carousel-item img {
    width: 100%;
    height: auto;
}

.carousel-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: white;
    padding: 20px;
}

/* 头部 */
.header {
    background: var(--gradient-primary);
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.nav-links li a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav-links li a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* 英雄区 */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    background: linear-gradient(rgba(13, 71, 161, 0.8), rgba(13, 71, 161, 0.6)), url('https://images.gptkong.com/demo/sample1.png');
    background-size: cover;
    background-position: center;
    color: white;
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: white;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

/* 波浪动画 */
.wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: url('data:image/svg+xml;utf8,<svg viewBox="0 0 1440 120" xmlns="http://www.w3.org/2000/svg"><path d="M0,64L60,58.7C120,53,240,43,360,48C480,53,600,75,720,80C840,85,960,75,1080,64C1200,53,1320,43,1380,37.3L1440,32L1440,120L1380,120C1320,120,1200,120,1080,120C960,120,840,120,720,120C600,120,480,120,360,120C240,120,120,120,60,120L0,120Z" fill="%23ffffff"></path></svg>');
    background-size: cover;
}

/* 文章版块 */
.article-section {
    background-color: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin: 2rem 0;
}

.article-section h2 {
    color: var(--primary-dark);
    margin-bottom: 1.5rem;
}

.article-section h3 {
    margin-top: 2rem;
}

.article-section ul {
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.article-section pre {
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    padding: 1rem;
    overflow-x: auto;
    margin: 1.5rem 0;
    border-left: 4px solid var(--primary-dark);
}

.article-section code {
    font-family: Menlo, Monaco, Consolas, 'Courier New', monospace;
    color: var(--primary-dark);
}

/* 底部 */
.footer {
    background: var(--dark);
    color: white;
    padding: 40px 0;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

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

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

.copyright {
    opacity: 0.7;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .container {
        padding: 0 15px;
    }
    
    h1 {
        font-size: 2.2rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }
    
    .grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }
    
    .feature-box {
        padding: 1.5rem;
    }
    
    .hero {
        min-height: 60vh;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 40px 0;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .article-section {
        padding: 20px;
    }
}

@media (max-width: 320px) {
    .container {
        padding: 0 10px;
    }
    
    .hero h1 {
        font-size: 1.6rem;
    }
    
    .grid {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate {
    animation: fadeIn 0.8s ease-in-out;
}

/* 设计提示框 */
.design-reference {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 15px 20px;
    border-radius: 5px;
    z-index: 1000;
    animation: fadeIn 0.5s ease;
}

@media (max-width: 480px) {
    .design-reference {
        bottom: 10px;
        right: 10px;
        font-size: 0.8rem;
        padding: 10px 15px;
    }
}