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

:root {
    --orange: #e67e22;
    --orange-dark: #d35400;
    --orange-light: #f39c12;
    --white: #ffffff;
    --gray-light: #f8f9fa;
    --gray: #6c757d;
    --text-dark: #2c3e50;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
}

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

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--orange) 0%, var(--orange-dark) 100%);
    color: var(--white);
    padding: 120px 20px 80px;
    text-align: center;
}

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

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 16px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.subtitle {
    font-size: 1.2rem;
    margin-bottom: 32px;
    opacity: 0.95;
}

.btn {
    display: inline-block;
    background: var(--white);
    color: var(--orange);
    padding: 14px 36px;
    border-radius: 50px;
    font-weight: bold;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background: var(--orange-light);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* Navigation */
.nav {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
}

.nav-logo {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--orange);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

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

.section-title {
    text-align: center;
    font-size: 2rem;
    color: var(--orange);
    margin-bottom: 48px;
    position: relative;
}

.section-title::after {
    content: "";
    display: block;
    width: 60px;
    height: 3px;
    background: var(--orange);
    margin: 16px auto 0;
}

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

/* About */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-text p {
    margin-bottom: 16px;
    font-size: 1.05rem;
}

.placeholder-image {
    background: linear-gradient(135deg, var(--orange-light) 0%, var(--orange) 100%);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    border-radius: 12px;
    aspect-ratio: 16/10;
}

/* Products */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.product-card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s;
}

.product-card:hover {
    transform: translateY(-8px);
}

.product-image {
    margin-bottom: 20px;
    aspect-ratio: 4/3;
}

.product-card h3 {
    color: var(--text-dark);
    margin-bottom: 8px;
}

.product-card .price {
    color: var(--orange);
    font-size: 1.4rem;
    font-weight: bold;
    margin-bottom: 8px;
}

.product-card .desc {
    color: var(--gray);
    font-size: 0.9rem;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 32px;
}

.feature-item {
    text-align: center;
    padding: 32px 20px;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.feature-item h3 {
    color: var(--orange);
    margin-bottom: 12px;
}

.feature-item p {
    color: var(--gray);
}

/* Contact */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.contact-label {
    color: var(--orange);
    font-weight: bold;
    min-width: 70px;
}

.contact-form {
    background: var(--white);
    padding: 32px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.contact-form h3 {
    margin-bottom: 20px;
    color: var(--orange);
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-form input,
.contact-form textarea {
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--orange);
}

/* Footer */
.footer {
    background: var(--orange-dark);
    color: var(--white);
    text-align: center;
    padding: 32px 0;
}

.footer p {
    opacity: 0.9;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .nav-links {
        display: none;
    }

    .nav-content {
        justify-content: center;
    }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .hero {
        padding: 80px 20px 60px;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

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

    .contact-form {
        padding: 20px;
    }
}