/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --text-dark: #1a1a1a;
    --text-light: #666666;
    --bg-white: #ffffff;
    --bg-light: #f1f5f9;
    --border-color: #cbd5e1;
    --shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
    --shadow-md: 0 4px 12px rgba(37, 99, 235, 0.15);
    --shadow-lg: 0 8px 24px rgba(37, 99, 235, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Noto Sans SC', 'Microsoft YaHei', '微软雅黑', 'PingFang SC', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 2px solid rgba(37, 99, 235, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
    border-bottom-color: rgba(37, 99, 235, 0.2);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    transition: var(--transition);
}

.logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    transition: var(--transition);
    filter: drop-shadow(0 2px 4px rgba(37, 99, 235, 0.2));
}

.logo-link:hover .logo-img {
    transform: scale(1.1) rotate(5deg);
    filter: drop-shadow(0 4px 8px rgba(37, 99, 235, 0.3));
}

.nav-brand .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    margin: 0;
}

.nav-brand .logo::before {
    content: '';
    position: absolute;
    left: -10px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 24px;
    background: var(--primary);
    border-radius: 2px;
    opacity: 0;
    transition: var(--transition);
}

.logo-link:hover .logo {
    color: var(--primary-dark);
    transform: translateX(5px);
}

.logo-link:hover .logo::before {
    opacity: 1;
    left: -14px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

.nav-link:hover::after {
    width: 80%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* Main Content */
.main-content {
    margin-top: 70px;
}

/* Hero Section */
.hero-section {
    min-height: calc(100vh - 70px);
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #60a5fa 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

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

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: 2.5rem;
    opacity: 0.95;
    line-height: 1.8;
    animation: fadeInUp 1s ease-out 0.2s backwards;
}

.btn-primary {
    display: inline-block;
    background: white;
    color: var(--primary);
    padding: 1rem 2.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.125rem;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
    animation: fadeInUp 1.2s ease-out 0.4s backwards;
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(37, 99, 235, 0.1);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-primary:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
    background: #f8fafc;
}

/* Sections */
.section {
    padding: 5rem 0;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
    animation: fadeInUp 0.6s ease-out;
}

.section-header .section-subtitle {
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
    line-height: 1.2;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    border-radius: 2px;
}

.section-subtitle {
    font-size: clamp(0.95rem, 2vw, 1.125rem);
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.service-card {
    background: var(--bg-white);
    padding: 2.5rem 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.05), transparent);
    transition: left 0.6s ease;
}

.service-card:hover::before {
    left: 100%;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
    background: linear-gradient(to bottom, #ffffff, #f8fafc);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: block;
    transition: var(--transition);
    filter: drop-shadow(0 2px 4px rgba(37, 99, 235, 0.2));
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
    filter: drop-shadow(0 4px 8px rgba(37, 99, 235, 0.3));
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
    font-weight: 600;
}

.service-card p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.product-card {
    background: var(--bg-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.product-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition);
}

.product-card:hover::after {
    opacity: 1;
}

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

.product-image {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, var(--primary-dark) 100%);
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-icon {
    font-size: 4rem;
    color: white;
    transition: var(--transition);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.product-card:hover .placeholder-icon {
    transform: scale(1.15) rotate(-5deg);
    filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.3));
}

.product-content {
    padding: 1.5rem;
}

.product-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
    font-weight: 600;
}

.product-content p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* About Section */
.about-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.about-text {
    margin-bottom: 3rem;
}

.about-text p {
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.feature-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow);
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
}

.feature-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary);
    border-radius: 2px 0 0 2px;
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.feature-item:hover::before {
    transform: scaleY(1);
}

.feature-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--primary-light);
}

.feature-check {
    color: var(--primary);
    font-weight: 700;
    font-size: 1.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: rgba(37, 99, 235, 0.1);
    border-radius: 50%;
    transition: var(--transition);
}

.feature-item:hover .feature-check {
    background: var(--primary);
    color: white;
    transform: scale(1.1) rotate(360deg);
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.contact-item {
    background: var(--bg-white);
    padding: 2.5rem 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
}

.contact-item::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.contact-item:hover::before {
    opacity: 1;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--primary-light);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 1.25rem;
    display: block;
    transition: var(--transition);
}

.contact-item:hover .contact-icon {
    transform: scale(1.15) translateY(-5px);
    filter: drop-shadow(0 4px 8px rgba(37, 99, 235, 0.3));
}

.contact-item h4 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
    font-weight: 600;
}

.contact-item p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* Footer */
.footer {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer-content p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

/* Responsive - Desktop (1024px and above) */
@media (min-width: 1024px) {
    .services-grid,
    .products-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 2rem;
    }
    
    .contact-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Responsive - Android Tablet (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
    .nav-container {
        padding: 1rem 1.5rem;
    }
    
    .nav-menu {
        gap: 1.5rem;
    }
    
    .nav-link {
        font-size: 0.9rem;
        padding: 0.5rem 0.75rem;
    }
    
    .container {
        padding: 0 1.5rem;
    }
    
    .section {
        padding: 4rem 0;
    }
    
    .services-grid,
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .contact-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Responsive - Mobile (below 768px) */
@media (max-width: 767px) {
    .nav-container {
        padding: 1rem;
    }
    
    .logo-img {
        width: 32px;
        height: 32px;
    }
    
    .nav-brand .logo {
        font-size: 1.25rem;
    }
    
    .logo-link {
        gap: 0.5rem;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: white;
        width: 100%;
        padding: 2rem 1rem;
        gap: 0;
        box-shadow: var(--shadow-lg);
        transition: var(--transition);
        z-index: 999;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-item {
        width: 100%;
    }
    
    .nav-link {
        display: block;
        padding: 1rem;
        text-align: center;
        border-radius: 8px;
        margin-bottom: 0.5rem;
    }
    
    .nav-link::after {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .hero-section {
        padding: 3rem 1.5rem;
        min-height: calc(100vh - 70px);
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .container {
        padding: 0 1.5rem;
    }
    
    .section-header {
        margin-bottom: 2.5rem;
    }
    
    .services-grid,
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .service-card,
    .product-card {
        padding: 1.5rem 1rem;
    }
    
    .service-icon {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }
    
    .service-card h3,
    .product-content h3 {
        font-size: 1rem;
        margin-bottom: 0.75rem;
    }
    
    .service-card p,
    .product-content p {
        font-size: 0.85rem;
        line-height: 1.6;
    }
    
    .product-image {
        height: 140px;
    }
    
    .placeholder-icon {
        font-size: 3rem;
    }
    
    .product-content {
        padding: 1.25rem 1rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .about-text p {
        font-size: 1rem;
    }
}

/* Small Mobile (below 480px) */
@media (max-width: 479px) {
    .container {
        padding: 0 1rem;
    }
    
    .logo-img {
        width: 28px;
        height: 28px;
    }
    
    .nav-brand .logo {
        font-size: 1.1rem;
    }
    
    .logo-link {
        gap: 0.4rem;
    }
    
    .hero-section {
        padding: 2rem 1rem;
    }
    
    .section {
        padding: 2.5rem 0;
    }
    
    .services-grid,
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
    
    .service-card,
    .product-card {
        padding: 1.25rem 0.75rem;
    }
    
    .service-icon {
        font-size: 2rem;
        margin-bottom: 0.75rem;
    }
    
    .service-card h3,
    .product-content h3 {
        font-size: 0.9rem;
        margin-bottom: 0.5rem;
    }
    
    .service-card p,
    .product-content p {
        font-size: 0.8rem;
        line-height: 1.5;
    }
    
    .product-image {
        height: 120px;
    }
    
    .placeholder-icon {
        font-size: 2.5rem;
    }
    
    .product-content {
        padding: 1rem 0.75rem;
    }
    
    .contact-item {
        padding: 1.5rem 1.25rem;
    }
}