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

body {
    font-family: 'Inter', sans-serif;
    background-color: #ffffff;
    color: #1A202C;
    line-height: 1.5;
    scroll-behavior: smooth;
}

/* 配色变量 */
:root {
    --primary: #0066CC;
    --primary-dark: #004C99;
    --secondary: #00A3E0;
    --accent: #0F2B3D;
    --gray-light: #F7F9FC;
    --gray-border: #E2E8F0;
    --text-dark: #1E293B;
    --text-muted: #475569;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 导航栏 */
.navbar {
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(8px);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--gray-border);
}
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    padding: 16px 24px;
    max-width: 1400px;
    margin: 0 auto;
}
.logo h1 {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, #0066CC, #00A3E0);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.5px;
}
.logo span {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    display: block;
}
.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}
.nav-links a {
    text-decoration: none;
    font-weight: 600;
    color: var(--text-dark);
    transition: color 0.2s;
}
.nav-links a:hover {
    color: var(--primary);
}
.mobile-toggle {
    display: none;
    font-size: 1.6rem;
    cursor: pointer;
    color: var(--text-dark);
}

/* 按钮 */
.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 40px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    display: inline-block;
    text-decoration: none;
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}
.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 8px 20px;
    border-radius: 40px;
    font-weight: 500;
    cursor: pointer;
    transition: 0.2s;
}
.btn-outline:hover {
    background: var(--primary);
    color: white;
}

/* Section 通用 */
.section {
    padding: 80px 0;
    border-bottom: 1px solid var(--gray-border);
}
.section-dark {
    background-color: var(--gray-light);
}
.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
    text-align: center;
}
.section-sub {
    text-align: center;
    color: var(--text-muted);
    max-width: 720px;
    margin: 0 auto 48px;
    font-size: 1.1rem;
}
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}
.card {
    background: white;
    border-radius: 28px;
    padding: 32px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.02), 0 2px 6px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-border);
}
.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 30px -12px rgba(0,102,204,0.15);
}
.product-img-placeholder {
    background: #EFF3F8;
    border-radius: 20px;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    margin-bottom: 20px;
    color: #5A6E8A;
    font-size: 0.9rem;
    border: 1px dashed #b9d0f0;
    gap: 12px;
}
.badge {
    background: #E6F2FF;
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 40px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 16px;
}
.stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary);
}
/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.7);
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal-content {
    background: white;
    max-width: 600px;
    width: 90%;
    border-radius: 32px;
    padding: 32px;
    position: relative;
    max-height: 80vh;
    overflow-y: auto;
}
.close-modal {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-muted);
    transition: 0.2s;
}
.close-modal:hover {
    color: var(--primary);
}
/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 16px;
        padding: 20px 0;
    }
    .nav-links.active {
        display: flex;
    }
    .mobile-toggle {
        display: block;
    }
    .section-title {
        font-size: 1.9rem;
    }
    .container {
        padding: 0 20px;
    }
    h1 {
        font-size: 2.2rem !important;
    }
}
footer {
    background: #0A1927;
    color: #CBD5E1;
    padding: 48px 0 24px;
}
.footer-inner {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 32px;
}
footer li,footer p{
    margin: 6px 0;
}
footer h4{
    color: white;
    margin-bottom: 12px;
}