/* 知云网络科技 - 全局样式 */

/* 变量定义 */
:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --accent: #0ea5e9;
    --secondary: #64748b;
    --text: #1e293b;
    --text-light: #64748b;
    --bg: #ffffff;
    --bg-gray: #f8fafc;
    --border: #e2e8f0;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 20px 50px rgba(37,99,235,0.15);
    --radius: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    text-decoration: none;
    color: inherit;
}

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

/* 布局容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 5rem 0;
}

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

.section-gradient {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%);
    color: white;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.05);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo svg {
    height: 45px;
    width: auto;
    display: block;
}

.footer-brand .logo svg {
    height: 40px;
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-icon.small {
    width: 32px;
    height: 32px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

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

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

.nav-cta {
    background: var(--primary);
    color: white !important;
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
}

.nav-cta:hover {
    background: var(--primary-dark);
}

.nav-cta::after {
    display: none !important;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text);
}

.mobile-menu {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    padding: 1rem;
}

.mobile-menu a {
    display: block;
    padding: 1rem;
    color: var(--text);
    border-bottom: 1px solid var(--border);
}

.mobile-menu.active {
    display: block;
}

/* Hero 区域 */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 100px 2rem 2rem;
    position: relative;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1e40af 100%);
    color: white;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(59,130,246,0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(14,165,233,0.2) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(30,64,175,0.2) 0%, transparent 70%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    margin-bottom: 2rem;
    border: 1px solid rgba(255,255,255,0.2);
}

.hero-badge span {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.9);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    text-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.hero-desc {
    font-size: 1.25rem;
    color: rgba(255,255,255,0.8);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-bottom: 3rem;
}

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

.stat-num {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
}

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

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 15px rgba(37,99,235,0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37,99,235,0.4);
}

.btn-secondary {
    background: rgba(255,255,255,0.1);
    color: white;
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.5);
}

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

.btn-white:hover {
    background: var(--bg-gray);
    transform: translateY(-2px);
}

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

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

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

/* 区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header.light {
    color: white;
}

.section-tag {
    display: inline-block;
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: var(--primary-dark);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

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

.section-header h2 {
    font-size: 2.5rem;
    color: var(--text);
    margin-bottom: 1rem;
}

.section-header.light h2 {
    color: white;
}

.section-header p {
    color: var(--text-light);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

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

/* 产品网格 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.product-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.product-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.product-content h3 {
    font-size: 1.25rem;
    color: var(--text);
    margin-bottom: 0.75rem;
}

.product-content p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.product-link {
    color: var(--primary);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 特性网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.feature-item {
    text-align: center;
    padding: 2rem;
}

.feature-icon-box {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.5rem;
}

.feature-item h4 {
    font-size: 1.25rem;
    color: var(--text);
    margin-bottom: 0.75rem;
}

.feature-item p {
    color: var(--text-light);
    line-height: 1.7;
}

/* 案例预览 */
.cases-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

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

.case-card:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-5px);
}

.case-logo {
    width: 60px;
    height: 60px;
    background: white;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.case-card h4 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.case-card p {
    color: rgba(255,255,255,0.8);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.case-result {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
}

/* CTA 区块 */
.cta-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-light) 100%);
    color: white;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.25rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* 页脚 */
.footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 4rem 0 2rem;
}

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

.footer-brand .logo {
    margin-bottom: 1.5rem;
}

.footer-brand .logo-text {
    color: white;
}

.footer-brand p {
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    color: #94a3b8;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--primary-light);
}

.footer-links h4,
.footer-contact h4 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-links a {
    display: block;
    color: #94a3b8;
    margin-bottom: 0.75rem;
    transition: var(--transition);
}

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

.footer-contact p {
    margin-bottom: 0.75rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #1e293b;
    color: #64748b;
    font-size: 0.875rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .section-header h2 {
        font-size: 1.75rem;
    }
    
    .features-grid,
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
}