/* 基础样式重置 */
:root {
    --primary-color: #0056b3;
    --secondary-color: #e9ecef;
    --text-color: #333;
    --bg-color: #f4f7f6;
    --white: #ffffff;
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--primary-color);
}

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

/* 头部导航 */
.header {
    background-color: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

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

.nav a {
    color: var(--text-color);
    font-weight: 500;
}

.nav a.active, .nav a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #0056b3 0%, #007bff 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    opacity: 0.9;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius);
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: #ff9800;
    color: var(--white);
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
}

.btn-primary:hover {
    background-color: #f57c00;
    color: var(--white);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: rgba(255,255,255,0.2);
    color: var(--white);
    border: 1px solid var(--white);
}

.btn-secondary:hover {
    background-color: var(--white);
    color: var(--primary-color);
}

/* 栅格布局 */
.features, .download-section, .seo-content {
    padding: 4rem 0;
}

.features h2, .seo-content h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card, .download-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    text-align: center;
}

.card h3, .download-card h2 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* 下载页专用 */
.page-title {
    background-color: var(--white);
    padding: 3rem 0;
    border-bottom: 1px solid #eaeaea;
}

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

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.download-card .meta {
    font-size: 0.9rem;
    color: #666;
    margin: 1rem 0;
}

.btn-block {
    display: block;
    width: 100%;
}

.seo-notice {
    background-color: #fff3cd;
    border: 1px solid #ffeeba;
    padding: 1.5rem;
    border-radius: var(--radius);
    color: #856404;
}

/* 底部 */
.footer {
    background-color: #343a40;
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
}

.footer .links {
    margin: 1rem 0;
}

.footer .links a {
    color: #adb5bd;
    margin: 0 0.5rem;
}

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

.friendly-links {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #adb5bd;
}

.friendly-links a {
    color: #ff9800;
    margin-left: 0.5rem;
}