/* styles.css */
:root {
    --primary: #1a73e8;
    --primary-dark: #0d5cb6;
    --secondary: #4285f4;
    --dark: #202124;
    --light: #f8f9fa;
    --gray: #5f6368;
    --light-gray: #dadce0;
    --card-bg: #ffffff;
    --header-gradient: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
    --card-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s ease;
    --compact-header-height: 60px;
}

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

body {
    font-family: 'Noto Sans SC', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e7eb 100%);
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    padding-top: 120px;
    padding-bottom: 60px;
}

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

/* 头部样式 */
#header-container header {
    background: var(--header-gradient);
    color: white;
    padding: 15px 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    transition: var(--transition);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
    transition: var(--transition);
}

.logo-icon {
    font-size: 2.2rem;
    color: #fff;
    background: rgba(255, 255, 255, 0.2);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 700;
    transition: var(--transition);
}

.logo-text span {
    font-weight: 300;
    font-size: 1.1rem;
    display: block;
    margin-top: 5px;
    opacity: 0.9;
    transition: var(--transition);
}

/* 紧凑模式样式 */
#header-container header.compact {
    padding: 5px 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid var(--light-gray);
}

#header-container header.compact .logo {
    gap: 10px;
}

#header-container header.compact .logo-icon {
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
}

#header-container header.compact .logo-text {
    font-size: 1.3rem;
    color: var(--dark);
}

#header-container header.compact .logo-text span {
    display: none;
}

/* 内容区域 */
.content-section {
    padding: 20px 0 40px;
}

.guide-header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.guide-title {
    font-size: 2.2rem;
    margin-bottom: 15px;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.version-badge {
    background: var(--primary);
    color: white;
    padding: 5px 15px;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 500;
}

.applicable-systems {
    background: #f0f7ff;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid var(--primary);
}

.applicable-title {
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--primary);
}

.systems-list {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 10px;
}

.system-item {
    background: white;
    padding: 10px 15px;
    border-radius: 6px;
    border: 1px solid var(--light-gray);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

.support-link {
    background: #e9f4ff;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--dark);
    transition: var(--transition);
}

.support-link:hover {
    background: #d4e8ff;
    transform: translateY(-3px);
}

.support-icon {
    font-size: 1.8rem;
    color: var(--primary);
}

/* 问题分类 */
.category-section {
    margin-bottom: 40px;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light-gray);
}

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

.category-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark);
}

/* 问题列表 */
.problem-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(550px, 1fr));
    gap: 20px;
}

@media (max-width: 768px) {
    .problem-list {
        grid-template-columns: 1fr;
    }
}

.problem-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
}

.problem-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
}

.problem-number {
    background: var(--primary);
    color: white;
    font-size: 1.2rem;
    font-weight: 700;
    min-width: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.problem-content {
    padding: 20px;
    flex: 1;
}

.problem-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.problem-desc {
    color: var(--gray);
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.problem-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    padding: 6px 15px;
    border-radius: 6px;
    background: rgba(26, 115, 232, 0.1);
    transition: var(--transition);
}

.problem-link:hover {
    background: rgba(26, 115, 232, 0.2);
}

/* 页脚样式 */
#footer-container footer {
    background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
    color: rgba(255, 255, 255, 0.7);
    padding: 30px 0;
    margin-top: 50px;
}

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

.copyright {
    font-size: 0.95rem;
}

.ipv6-badge {
    background: rgba(255, 255, 255, 0.1);
    padding: 5px 15px;
    border-radius: 30px;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .guide-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 768px) {
    body {
        padding-top: 100px;
    }
    
    .guide-title {
        font-size: 1.6rem;
        flex-direction: column;
    }
    
    .systems-list {
        flex-direction: column;
    }
    
    .problem-list {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    body {
        padding-top: 80px;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }
    
    .logo-text {
        font-size: 1.3rem;
    }
    
    .logo-text span {
        display: none;
    }
    
    .problem-card {
        flex-direction: column;
    }
    
    .problem-number {
        min-height: 50px;
        min-width: 100%;
    }
}