/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

/* Header & Navigation */
header {
    background-color: #ffffff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #0056b3;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover, .nav-links a.active {
    color: #0056b3;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}
.menu-toggle span {
    height: 3px;
    width: 25px;
    background: #333;
    margin-bottom: 4px;
    border-radius: 2px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #0056b3 0%, #002244 100%);
    color: white;
    text-align: center;
    padding: 80px 20px;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.btn-primary {
    display: inline-block;
    background-color: #ff6b6b;
    color: white;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: background 0.3s;
}
.btn-primary:hover {
    background-color: #ff5252;
}

/* Main Content Container */
.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2rem;
    color: #111;
}

/* E-commerce Product Grid */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.product-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 25px rgba(0,0,0,0.1);
}

.product-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    background-color: #eee;
}

.product-info {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-title {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #222;
}

.product-desc {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 20px;
    flex-grow: 1;
}

.product-action {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid #eee;
    padding-top: 15px;
}

.product-price {
    color: #e53935;
    font-weight: bold;
    font-size: 1.1rem;
}

.btn-buy {
    background-color: #0056b3;
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    text-decoration: none;
    font-size: 0.9rem;
    transition: background 0.3s;
}

.btn-buy:hover {
    background-color: #004494;
}

/* Forms (Contact Page) */
.contact-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
}
.contact-info, .contact-form {
    flex: 1;
    min-width: 300px;
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}
.contact-form input, .contact-form textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border: 1px solid #ddd;
    border-radius: 6px;
}
.contact-form button {
    background: #0056b3;
    color: white;
    border: none;
    padding: 12px 20px;
    cursor: pointer;
    border-radius: 6px;
    font-size: 1rem;
    width: 100%;
}
.contact-form button:hover {
    background: #004494;
}

/* Footer */
footer {
    background-color: #222;
    color: #ccc;
    text-align: center;
    padding: 40px 20px;
    margin-top: 60px;
}
footer p {
    margin-bottom: 10px;
}
footer a {
    color: #fff;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        background: #fff;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        text-align: center;
    }
    .nav-links.active {
        display: flex;
    }
    .nav-links li {
        padding: 15px 0;
        border-bottom: 1px solid #eee;
    }
    .menu-toggle {
        display: flex;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
}