/* 全局样式重置和基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary-color: #1f27fa;
    --secondary-color: #2575fc;
    --accent-color: #50aaff;
    --text-color: #333;
    --light-bg: #f5f7fa;
    --card-bg: #ffffff;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    background: linear-gradient(135deg, var(--light-bg) 0%, #c3cfe2 100%);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

/* 头部样式 */
header {
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 25px 30px;
    text-align: center;
    position: relative;
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    font-size: 2.2rem;
    margin-bottom: 15px;
}

h2 {
    font-size: 1.8rem;
    margin: 25px 0 15px;
    color: #2c3e50;
    border-left: 5px solid var(--primary-color);
    padding-left: 15px;
}

h3 {
    font-size: 1.4rem;
    margin: 15px 0;
    color: var(--accent-color);
}

/* 导航样式 */
.nav-container {
    background: #f8f9fa;
    padding: 15px;
    border-bottom: 1px solid #eaeaea;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.nav-item {
    margin: 8px 15px;
}

/* 链接和按钮样式 */
a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.btn {
    display: inline-block;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 12px 25px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(106, 17, 203, 0.3);
    margin: 10px 5px;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 7px 20px rgba(106, 17, 203, 0.4);
    text-decoration: none;
    color: white;
}

/* 内容区域样式 */
.content {
    padding: 30px;
}

.card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    border-left: 4px solid var(--primary-color);
}

.code-block {
    background: #f8f9fa;
    border: 1px solid #eaeaea;
    border-radius: 8px;
    padding: 15px;
    margin: 15px 0;
    font-family: 'Consolas', monospace;
    overflow-x: auto;
}

/* 乐器列表样式 */
.instrument-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.instrument-item {
    background: #f0f4ff;
    padding: 12px;
    border-radius: 8px;
    border-left: 3px solid var(--secondary-color);
}

/* 下载区域样式 */
.download-section {
    margin: 25px 0;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 15px;
}

.download-item {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 15px;
    transition: var(--transition);
    border: 1px solid #eaeaea;
}

.download-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* 快速导航样式 */
.quick-nav {
    background: #eaf2ff;
    padding: 15px;
    border-radius: 10px;
    margin: 20px 0;
}

/* 页脚样式 */
footer {
    text-align: center;
    padding: 20px;
    background: #2c3e50;
    color: white;
    margin-top: 30px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        border-radius: 0;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .content {
        padding: 20px;
    }
    
    .instrument-list, .download-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-container {
        flex-direction: column;
        align-items: center;
    }
}

/* 主页特定样式 */
.home-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.home-card {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4efe9 100%);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
}

.home-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.home-card h2 {
    border: none;
    margin-top: 0;
    padding: 0;
    color: var(--primary-color);
}

.home-card p {
    margin: 15px 0;
    color: #666;
}

/* 下载页面特定样式 */
.file-type-section {
    margin: 30px 0;
}

.file-list {
    columns: 2;
    column-gap: 20px;
}

.file-list a {
    display: block;
    padding: 10px;
    margin-bottom: 10px;
    break-inside: avoid;
    background: #f8f9fa;
    border-radius: 6px;
    transition: var(--transition);
}

.file-list a:hover {
    background: #eaf2ff;
}

@media (max-width: 600px) {
    .file-list {
        columns: 1;
    }
}