/* ============================================
   未来智造科技 - 响应式企业网站样式表
   主题：脑健康科技 + 智能社区
   ============================================ */

/* CSS变量 */
:root {
    /* 主色调 */
    --primary: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #818CF8;
    --primary-bg: #EEF2FF;
    
    /* 辅助色 */
    --secondary: #10B981;
    --secondary-dark: #059669;
    --secondary-bg: #D1FAE5;
    
    /* 中性色 */
    --dark: #1E293B;
    --gray-700: #374151;
    --gray-500: #6B7280;
    --gray-400: #9CA3AF;
    --gray-200: #E5E7EB;
    --gray-100: #F3F4F6;
    --gray-50: #F9FAFB;
    --white: #FFFFFF;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--secondary) 0%, #34D399 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-brain: linear-gradient(135deg, #4F46E5 0%, #06B6D4 50%, #10B981 100%);
    --gradient-community: linear-gradient(135deg, #0891B2 0%, #4F46E5 100%);
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    
    /* 字体 */
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* 基础重置 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--dark);
    background-color: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ============================================
   通用组件
   ============================================ */

/* 渐变文字 */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius);
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.5);
}

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

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

.btn-block {
    width: 100%;
}

/* 区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-tag {
    display: inline-block;
    padding: 0.35rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary);
    background: var(--primary-bg);
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 0.75rem;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

.section-header.light .section-tag {
    color: var(--white);
    background: rgba(255, 255, 255, 0.2);
}

.section-header.light .section-title {
    color: var(--white);
}

.section-header.light .section-desc {
    color: rgba(255, 255, 255, 0.8);
}

/* 产品标签 */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
}

.badge-new {
    background: #FEF3C7;
    color: #D97706;
}

.badge-hot {
    background: #FEE2E2;
    color: #DC2626;
}

.badge-free {
    background: var(--secondary-bg);
    color: var(--secondary-dark);
}

/* ============================================
   导航栏
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 2rem;
    color: var(--primary);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.logo-text {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--dark);
}

.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    position: relative;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gray-700);
    padding: 0.5rem 0;
}

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

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

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

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* 移动端菜单 */
.mobile-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    z-index: 999;
    padding: 1.5rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--gray-700);
    border-radius: var(--radius);
    transition: var(--transition);
}

.mobile-nav-link:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.mobile-nav-link i {
    width: 24px;
    color: var(--primary);
}

/* ============================================
   Hero区域
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    background: var(--dark);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-brain);
    opacity: 0.95;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero .container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--white);
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    margin-bottom: 1.5rem;
}

.hero-badge i {
    animation: bounce 1s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero-desc {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-desc strong {
    color: #FDE68A;
}

.hero-btns {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-circles {
    position: relative;
    width: 350px;
    height: 350px;
}

.circle {
    position: absolute;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.circle-1 {
    width: 100%;
    height: 100%;
    animation: rotate 20s linear infinite;
}

.circle-2 {
    width: 80%;
    height: 80%;
    top: 10%;
    left: 10%;
    animation: rotate 15s linear infinite reverse;
}

.circle-3 {
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    font-size: 3.5rem;
    color: var(--white);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(-50%, -50%) translateY(0); }
    50% { transform: translate(-50%, -50%) translateY(-15px); }
}

.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    line-height: 0;
}

.hero-wave svg {
    width: 100%;
    height: 80px;
}

/* ============================================
   数据统计
   ============================================ */

.stats {
    padding: 4rem 0;
    background: var(--white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
}

.stat-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-bg);
    border-radius: var(--radius-lg);
    font-size: 1.5rem;
    color: var(--primary);
}

.stat-num {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dark);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-num::after {
    content: '+';
}

.stat-label {
    font-size: 0.95rem;
    color: var(--gray-500);
}

/* ============================================
   业务方向
   ============================================ */

.business-section {
    padding: 5rem 0;
    background: var(--gray-50);
}

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

.business-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.business-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    font-size: 2rem;
    color: var(--white);
    margin-bottom: 1.5rem;
}

.business-card:nth-child(2) .business-icon {
    background: var(--gradient-community);
}

.business-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.business-card > p {
    color: var(--gray-500);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.business-tags {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.business-tags li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-700);
}

.business-tags li i {
    color: var(--secondary);
}

/* ============================================
   产品区域
   ============================================ */

.products-section {
    padding: 5rem 0;
    background: var(--white);
}

.software-section {
    background: var(--gray-50);
}

/* 产品标签切换 */
.product-tabs {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    background: var(--gray-100);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.tab-btn:hover {
    background: var(--gray-200);
}

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

/* 产品网格 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.product-image {
    position: relative;
    height: 180px;
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-image i {
    font-size: 4rem;
    color: var(--gray-400);
    transition: var(--transition);
}

.product-card:hover .product-image i {
    transform: scale(1.1);
    color: var(--primary);
}

.product-badges {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    gap: 0.5rem;
}

.product-content {
    padding: 1.25rem;
}

.product-category {
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.product-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-desc {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-100);
}

.product-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.product-price small {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--gray-400);
}

.product-action {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    color: var(--primary);
    background: var(--primary-bg);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.product-card:hover .product-action {
    background: var(--primary);
    color: var(--white);
}

/* 软件卡片 */
.software-grid .product-image {
    background: linear-gradient(135deg, var(--primary-bg) 0%, #DBEAFE 100%);
}

.software-grid .product-card:hover .product-image i {
    color: var(--secondary);
}

.software-grid .product-action {
    color: var(--secondary);
    background: var(--secondary-bg);
}

.software-grid .product-card:hover .product-action {
    background: var(--secondary);
    color: var(--white);
}

/* 加载更多 */
.load-more {
    text-align: center;
    margin-top: 2.5rem;
}

/* ============================================
   解决方案
   ============================================ */

.solutions-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--dark) 0%, #1a365d 100%);
}

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

.solution-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: 2rem;
    transition: var(--transition);
}

.solution-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
}

.solution-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: 1.25rem;
}

.solution-card:nth-child(2) .solution-icon {
    background: var(--gradient-secondary);
}

.solution-card:nth-child(3) .solution-icon {
    background: linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
}

.solution-card:nth-child(4) .solution-icon {
    background: linear-gradient(135deg, #8B5CF6 0%, #EC4899 100%);
}

.solution-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0.75rem;
}

.solution-card > p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.25rem;
    line-height: 1.7;
}

.solution-features {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.solution-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.85);
}

.solution-features li i {
    color: var(--secondary);
}

.solution-scope {
    display: block;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ============================================
   下载中心
   ============================================ */

.downloads-section {
    padding: 5rem 0;
    background: var(--white);
}

/* 下载分类按钮组 - 使用原 download-card 风格 */
.downloads-category-btns {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.dl-category-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.dl-category-btn:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.dl-category-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.dl-category-btn:nth-child(1) .dl-category-icon {
    background: var(--primary-bg);
    color: var(--primary);
}
.dl-category-btn:nth-child(2) .dl-category-icon {
    background: var(--secondary-bg);
    color: var(--secondary);
}
.dl-category-btn:nth-child(3) .dl-category-icon {
    background: #FEF3C7;
    color: #D97706;
}
.dl-category-btn:nth-child(4) .dl-category-icon {
    background: #FCE7F3;
    color: #DB2777;
}

.dl-category-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.dl-category-count {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.dl-category-btn .dl-category-action {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--white);
    background: var(--gradient-primary);
    border-radius: var(--radius);
    transition: var(--transition);
}

.dl-category-btn:hover .dl-category-action {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

/* 下载弹窗 */
.download-modal-content {
    max-width: 860px !important;
    width: 90vw;
    max-height: 80vh;
    overflow: hidden;
    padding: 2rem;
}

.download-modal-content .modal-close {
    top: 0.5rem;
    right: 0.5rem;
    z-index: 1;
}

.download-modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.download-modal-title i {
    color: var(--primary);
}

/* 弹窗内下载列表 - 网格卡片布局，复用 download-card 风格 */
.download-modal-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
    max-height: calc(80vh - 6rem);
    overflow-y: auto;
}

.download-modal-list .download-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    min-width: 0;
}

.download-modal-list .download-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.download-modal-list .download-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.download-modal-list .download-card:nth-child(3n+1) .download-icon {
    background: var(--primary-bg);
    color: var(--primary);
}
.download-modal-list .download-card:nth-child(3n+2) .download-icon {
    background: var(--secondary-bg);
    color: var(--secondary);
}
.download-modal-list .download-card:nth-child(3n) .download-icon {
    background: #FEF3C7;
    color: #D97706;
}

.download-modal-list .download-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.download-modal-list .download-info {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.download-modal-list .download-info span {
    margin-right: 1rem;
}

.download-modal-list .download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--white);
    background: var(--gradient-primary);
    border-radius: var(--radius);
    transition: var(--transition);
    text-decoration: none;
}

.download-modal-list .download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.dl-item-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem 1rem;
    color: var(--gray-400);
}

.dl-item-empty i {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.75rem;
}

/* ============================================
   联系我们
   ============================================ */

.contact-section {
    padding: 5rem 0;
    background: var(--gray-50);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 3rem;
}

.contact-info {
    padding: 2rem;
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
}

.contact-item {
    display: flex;
    gap: 1rem;
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--gray-100);
}

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

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-bg);
    border-radius: var(--radius);
    font-size: 1.1rem;
    color: var(--primary);
    flex-shrink: 0;
}

.contact-text h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.25rem;
}

.contact-text p {
    font-size: 0.95rem;
    color: var(--gray-500);
}

.social-links {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-100);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    border-radius: var(--radius);
    color: var(--gray-600);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    color: var(--white);
}

/* 联系表单 */
.contact-form {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
}

.contact-form h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.required {
    color: #DC2626;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    color: var(--dark);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-group select {
    cursor: pointer;
}

/* ============================================
   页脚
   ============================================ */

.footer {
    background: var(--dark);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr) 1.2fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-about .footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-about .footer-logo i {
    color: var(--primary-light);
    font-size: 1.5rem;
}

.footer-about p {
    font-size: 0.9rem;
    color: var(--gray-400);
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

.footer-social {
    display: flex;
    gap: 0.75rem;
}

.footer-social a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    color: var(--white);
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links li a {
    font-size: 0.9rem;
    color: var(--gray-400);
}

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

.footer-contact h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--gray-400);
    margin-bottom: 0.75rem;
}

.footer-contact i {
    width: 20px;
    color: var(--primary-light);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 0.5rem;
}

.footer-bottom a {
    color: var(--gray-400);
}

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

/* ============================================
   模态框
   ============================================ */

.modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 700px;
    max-height: 90vh;
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transform: translateY(20px);
    transition: var(--transition);
}

.modal.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    border-radius: 50%;
    color: var(--gray-600);
    z-index: 1;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--gray-200);
    color: var(--dark);
}

.modal-body {
    max-height: 90vh;
    overflow-y: auto;
    padding: 2rem;
}

.modal-product-image {
    height: 200px;
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: -2rem -2rem 1.5rem;
    padding: 2rem;
}

.modal-product-image i {
    font-size: 5rem;
    color: var(--gray-400);
}

.modal-product-category {
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.modal-product-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.modal-product-model {
    font-size: 0.9rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.modal-product-desc {
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    white-space: pre-line;
}

.modal-section {
    margin-bottom: 1.5rem;
}

.modal-section h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--gray-200);
}

.spec-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.spec-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.spec-item span:first-child {
    color: var(--gray-500);
}

.spec-item span:last-child {
    font-weight: 500;
    color: var(--dark);
}

.features-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.features-list li {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    background: var(--primary-bg);
    color: var(--primary);
    border-radius: var(--radius-full);
}

.features-list li i {
    font-size: 0.75rem;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-200);
    margin-top: 1.5rem;
}

.modal-price {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
}

.modal-price small {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--gray-400);
}

/* ============================================
   Toast提示
   ============================================ */

.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--dark);
    color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 3000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    visibility: visible;
}

.toast i {
    color: var(--secondary);
}

/* ============================================
   空状态
   ============================================ */

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--gray-500);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--gray-300);
}

.empty-state p {
    font-size: 1rem;
}

/* ============================================
   响应式设计
   ============================================ */

/* 平板端 */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-btns {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .business-grid {
        grid-template-columns: 1fr;
    }
    
    .solutions-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 移动端 */
@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-desc {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .product-tabs {
        gap: 0.5rem;
    }
    
    .tab-btn {
        padding: 0.5rem 0.9rem;
        font-size: 0.8rem;
    }
    
    .tab-btn i {
        display: none;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .downloads-category-btns {
        grid-template-columns: repeat(2, 1fr);
    }
    .download-modal-list {
        grid-template-columns: 1fr;
    }
    
    .download-modal-content {
        max-width: 95vw;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-contact p {
        justify-content: center;
    }
    
    .spec-list {
        grid-template-columns: 1fr;
    }
}

/* 小屏手机 */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .stat-num {
        font-size: 2rem;
    }
    
    .business-card {
        padding: 1.5rem;
    }
    
    .solution-card {
        padding: 1.5rem;
    }
    
    .modal-content {
        margin: 0.5rem;
    }
    
    .modal-body {
        padding: 1.5rem;
    }
}