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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo img {
    height: 50px;
    width: auto;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    padding: 0.5rem 0;
}

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

/* Hero Section */
.hero {
    margin-top: 80px;
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-cta {
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
}

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

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

/* Sections */
section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

/* Product Section */
.product {
    background-color: var(--bg-white);
}

.product-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.product-image img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.product-info h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.product-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.product-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.feature-item {
    text-align: center;
    padding: 1.5rem;
    background-color: var(--bg-light);
    border-radius: 12px;
    transition: transform 0.3s;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.feature-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.feature-item p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* About Section */
.about {
    background-color: var(--bg-light);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.about-info {
    padding: 1.5rem;
    background-color: var(--bg-white);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

/* Contact Section */
.contact {
    background-color: var(--bg-white);
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
    max-width: 800px;
    margin: 0 auto;
}

.contact-item {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-light);
    border-radius: 12px;
    transition: transform 0.3s;
}

.contact-item:hover {
    transform: translateY(-5px);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-item h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.contact-item a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.contact-item a:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    background-color: var(--text-dark);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-info p {
    opacity: 0.8;
    font-size: 0.9rem;
    margin: 0.25rem 0;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .product-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .product-image img {
        max-width: 100%;
    }

    .product-features {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    section {
        padding: 50px 0;
    }
}