:root {
    --primary: #10b981;
    --primary-dark: #059669;
    --primary-light: #d1fae5;
    --secondary: #3b82f6;
    --accent: #8b5cf6;
    --text: #1f2937;
    --text-light: #6b7280;
    --bg: #ffffff;
    --bg-light: #f9fafb;
    --border: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg-light);
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* 导航 */
header {
    background: var(--bg);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    flex-wrap: wrap;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    flex-wrap: wrap;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.mobile-menu { display: none; font-size: 1.5rem; cursor: pointer; }

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.btn-quark { background: #00b4ff; color: white; }
.btn-baidu { background: #2932e1; color: white; }
.btn-thunder { background: #0099ff; color: white; }

.btn-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* 英雄区 */
.hero {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg) 100%);
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* 卡片 */
.card {
    background: var(--bg);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

/* 功能标签 */
.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-light);
    color: var(--primary-dark);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    margin: 0.25rem;
}

/* 子导航 */
.sub-nav {
    background: white;
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 70px;
    z-index: 100;
}

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

.sub-nav-links a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s;
}

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

/* 内容区 */
.section {
    padding: 4rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text);
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 3rem;
}

/* 软件展示 */
.showcase {
    background: white;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    margin: 3rem 0;
}

.showcase img {
    width: 100%;
    height: auto;
    display: block;
}

/* 下载区 */
.download-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.download-section h2 { font-size: 2.5rem; margin-bottom: 2rem; }

.version-card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border-radius: 1rem;
    padding: 2rem;
    margin: 1rem;
    border: 1px solid rgba(255,255,255,0.2);
}

/* 免责声明 */
.disclaimer {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: 1rem;
    margin: 2rem 0;
    border-radius: 0 0.5rem 0.5rem 0;
    font-size: 0.9rem;
    color: #92400e;
}

/* 页脚 */
footer {
    background: var(--text);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-links h3 {
    margin-bottom: 1rem;
    color: var(--primary-light);
}

.footer-links ul {
    list-style: none;
}

.footer-links a {
    color: #9ca3af;
    text-decoration: none;
    line-height: 2;
    transition: color 0.3s;
}

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

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #6b7280;
}

/* 面包屑 */
.breadcrumb {
    background: var(--bg);
    padding: 1rem 0;
    font-size: 0.9rem;
    color: var(--text-light);
}

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

.breadcrumb a:hover { text-decoration: underline; }

/* 内容样式 */
.content h2 {
    font-size: 1.8rem;
    margin: 2rem 0 1rem;
    color: var(--primary-dark);
}

.content h3 {
    font-size: 1.4rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text);
}

.content p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.content ul, .content ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content li {
    margin-bottom: 0.5rem;
}

/* FAQ手风琴 */
.faq-item {
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 0;
}

.faq-question {
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text);
}

.faq-answer {
    margin-top: 1rem;
    color: var(--text-light);
    display: none;
}

.faq-answer.active { display: block; }

/* 表格 */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--bg-light);
    font-weight: 600;
    color: var(--primary-dark);
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 1rem;
        padding: 1rem 0;
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu { display: block; }

    .hero h1 { font-size: 2rem; }

    .hero p { font-size: 1rem; }

    .btn-group {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .section-title { font-size: 1.8rem; }
}