/* ========================================
   正伟信息服务 - 现代风格CSS
   ======================================== */

/* 变量定义 */
:root {
    --primary: #1890ff;
    --primary-dark: #096dd9;
    --secondary: #52c41a;
    --accent: #fa8c16;
    --danger: #f5222d;
    --text-primary: #262626;
    --text-secondary: #595959;
    --text-muted: #8c8c8c;
    --border-color: #e8e8e8;
    --bg-light: #fafafa;
    --bg-white: #ffffff;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-light);
}

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

/* ========================================
   头部导航
   ======================================== */
.header {
    background: linear-gradient(135deg, #1890ff 0%, #096dd9 100%);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    background: var(--text-primary);
    color: #fff;
    padding: 8px 0;
    font-size: 13px;
}

.header-main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo img {
    width: 60px;
    height: 48px;
    object-fit: contain;
}

.logo-text h1 {
    color: #fff;
    font-size: 20px;
    font-weight: 600;
}

.logo-text span {
    color: rgba(255,255,255,0.85);
    font-size: 12px;
}

/* 导航菜单 */
.nav {
    display: flex;
    gap: 5px;
}

.nav a {
    color: #fff;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-weight: 500;
    position: relative;
}

.nav a:hover,
.nav a.active {
    background: rgba(255,255,255,0.2);
}

.nav a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: #fff;
    border-radius: 2px;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 60px 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="15" fill="rgba(255,255,255,0.05)"/><circle cx="80" cy="60" r="25" fill="rgba(255,255,255,0.03)"/></svg>');
    background-size: 200px;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero h2 {
    font-size: 36px;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 18px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 30px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
}

/* ========================================
   按钮
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

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

.btn-secondary {
    background: rgba(255,255,255,0.2);
    color: #fff;
    border: 2px solid #fff;
}

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

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

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

/* ========================================
   卡片
   ======================================== */
.card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
}

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

.card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-body {
    padding: 20px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.card-text {
    color: var(--text-secondary);
    margin-bottom: 15px;
}

/* 产品卡片 */
.product-card {
    position: relative;
    overflow: hidden;
}

.product-card .card-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--accent);
    color: #fff;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

/* ========================================
   网格布局
   ======================================== */
.grid {
    display: grid;
    gap: 24px;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ========================================
   分区
   ======================================== */
.section {
    padding: 60px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-muted);
}

.section-dark {
    background: var(--text-primary);
}

.section-dark .section-title {
    color: #fff;
}

.section-dark .section-subtitle {
    color: rgba(255,255,255,0.7);
}

/* ========================================
   特性区块
   ======================================== */
.feature-item {
    display: flex;
    gap: 20px;
    padding: 20px;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    transition: var(--transition);
}

.feature-item:hover {
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    flex-shrink: 0;
}

.feature-icon.blue { background: rgba(24,144,255,0.1); color: var(--primary); }
.feature-icon.green { background: rgba(82,196,26,0.1); color: var(--secondary); }
.feature-icon.orange { background: rgba(250,140,22,0.1); color: var(--accent); }
.feature-icon.red { background: rgba(245,34,45,0.1); color: var(--danger); }

.feature-content h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-content p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ========================================
   下载列表
   ======================================== */
.download-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.download-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.download-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.download-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-name {
    font-weight: 500;
}

.download-size {
    color: var(--text-muted);
    font-size: 12px;
}

/* ========================================
   联系信息
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info {
    padding: 30px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-item i {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-label {
    font-weight: 600;
    margin-bottom: 4px;
}

.contact-value {
    color: var(--text-secondary);
}

.contact-qr {
    text-align: center;
    padding: 30px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.contact-qr img {
    width: 200px;
    height: 200px;
    margin-bottom: 15px;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--text-primary);
    color: #fff;
    padding: 40px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 30px;
}

.footer h4 {
    font-size: 16px;
    margin-bottom: 15px;
    color: #fff;
}

.footer p,
.footer a {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    line-height: 2;
}

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

.footer a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
    color: rgba(255,255,255,0.5);
    font-size: 13px;
}

.footer-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 15px;
}

/* ========================================
   标签页
   ======================================== */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 12px 24px;
    background: none;
    border: none;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    position: relative;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--primary);
}

.tab-btn.active {
    color: var(--primary);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ========================================
   文章内容
   ======================================== */
.article {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-sm);
}

.article h2 {
    font-size: 24px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.article h3 {
    font-size: 18px;
    margin: 25px 0 15px;
}

.article p {
    margin-bottom: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.article ul {
    margin: 15px 0;
    padding-left: 25px;
}

.article li {
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.article li::marker {
    color: var(--primary);
}

/* ========================================
   统计卡片
   ======================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
}

.stat-label {
    color: var(--text-muted);
    font-size: 14px;
}

/* ========================================
   QQ咨询
   ======================================== */
.qq咨询 {
    display: flex;
    gap: 15px;
    margin: 20px 0;
}

.qq-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.qq-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 992px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-main {
        flex-wrap: wrap;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .nav {
        display: none;
        width: 100%;
        flex-direction: column;
        padding: 10px 0;
    }
    
    .nav.active {
        display: flex;
    }
    
    .nav a {
        padding: 12px 20px;
        border-radius: 0;
    }
    
    .hero h2 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .section {
        padding: 40px 0;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .article {
        padding: 20px;
    }
}

/* ========================================
   工具类
   ======================================== */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-muted { color: var(--text-muted); }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }