:root {
    --primary-color: #2c3e50;
    --accent-color: #c5a47e; /* 香槟金 */
    --text-dark: #1a1a1a;
    --text-gray: #666;
    --text-light: #999;
    --bg-light: #f9f9f9;
    --white: #ffffff;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    font-size: 16px;
    overflow-x: hidden;
    width: 100%;
}

body {
    font-family: 'Noto Sans SC', "Microsoft YaHei", sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
    width: 100%;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 36px;
    font-size: 16px;
    font-weight: 500;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: #b08d65;
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--white);
    color: var(--white);
}

.btn-outline:hover {
    background-color: var(--white);
    color: var(--text-dark);
}

.btn-full {
    width: 100%;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 15px;
    border: none;
}

.btn-full:hover {
    background-color: #1a252f;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    max-width: 100vw;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    background: linear-gradient(to bottom, rgba(0,0,0,0.6), transparent);
}

.navbar.scrolled {
    background: var(--white);
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    display: flex;
    flex-direction: column;
    color: var(--white);
}

.logo-img {
    height: 40px;
    width: 200px;
    object-fit: contain;
    object-position: left center;
    transition: var(--transition);
    display: block;
    /* 变白 */
    /* filter: brightness(0) invert(1); */
    /* 混合模式：确保黑底变透明 (如果原图有背景)，且保留白色 */
    mix-blend-mode: screen;
    opacity: 1;
}

.navbar.scrolled .logo-img {
    /* 滚动后恢复原样 */
    filter: none;
    mix-blend-mode: normal;
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    color: var(--white);
    font-size: 15px;
    font-weight: 500;
    position: relative;
    padding-bottom: 5px;
}

.navbar.scrolled .nav-links a {
    color: var(--text-dark);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.mobile-only {
    display: none;
}

.nav-contact .phone-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--white);
    font-weight: 600;
    border: 1px solid rgba(255,255,255,0.3);
    padding: 8px 20px;
    border-radius: 50px;
}

.navbar.scrolled .nav-contact .phone-btn {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.hamburger {
    display: none;
    cursor: pointer;
}

/* Hero Section */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* background: url('https://images.unsplash.com/photo-1600607687939-ce8a6c25118c?q=80&w=2000&auto=format&fit=crop') no-repeat center/cover; */
    background: url('images/首页-窗效果2.png') no-repeat center/cover;
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    padding-top: 60px;
}

.hero h1 {
    font-size: 64px;
    margin-bottom: 20px;
    letter-spacing: 2px;
    font-weight: 300;
}

.hero p {
    font-size: 20px;
    margin-bottom: 40px;
    font-weight: 300;
    opacity: 0.9;
}

.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.scroll-down span {
    width: 20px;
    height: 20px;
    border-bottom: 2px solid var(--white);
    border-right: 2px solid var(--white);
    transform: rotate(45deg);
    margin: -5px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { opacity: 0; transform: rotate(45deg) translate(-20px, -20px); }
    50% { opacity: 1; }
    100% { opacity: 0; transform: rotate(45deg) translate(20px, 20px); }
}

/* Features */
.features {
    padding: 80px 0;
    background-color: var(--white);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    text-align: center;
}

.feature-item {
    padding: 30px;
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-10px);
}

.icon-box {
    width: 80px;
    height: 80px;
    background: #f4f4f4;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    color: var(--primary-color);
    transition: var(--transition);
}

.feature-item:hover .icon-box {
    background: var(--accent-color);
    color: var(--white);
}

.icon-box svg {
    width: 40px;
    height: 40px;
}

.feature-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.feature-item p {
    color: var(--text-gray);
    font-size: 14px;
}

/* Common Section Header */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header .subtitle {
    display: block;
    color: var(--accent-color);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 3px;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.section-header h2 {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.section-header .line {
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
    margin: 0 auto;
}

/* Products */
.products {
    padding: 100px 0;
    background-color: var(--bg-light);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.product-card {
    background: var(--white);
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    group: product;
}

.product-img {
    position: relative;
    overflow: hidden;
    height: 400px;
}

.product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.product-card:hover .product-img img {
    transform: scale(1.1);
}

.product-img .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(44, 62, 80, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.product-card:hover .product-img .overlay {
    opacity: 1;
}

.product-info {
    padding: 25px;
    text-align: center;
}

.product-info h3 {
    font-size: 22px;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.product-info p {
    color: var(--accent-color);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* About */
.about {
    padding: 100px 0;
}

.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-content .lead {
    font-size: 18px;
    color: var(--primary-color);
    margin-bottom: 20px;
    font-weight: 500;
}

.about-content p {
    color: var(--text-gray);
    margin-bottom: 40px;
}

.stats {
    display: flex;
    gap: 50px;
    border-top: 1px solid #eee;
    padding-top: 30px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-item .number {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-item .label {
    font-size: 12px;
    color: var(--text-gray);
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: 4px;
    box-shadow: 20px 20px 0 #f4f4f4;
}

.exp-badge {
    position: absolute;
    bottom: -20px;
    left: -20px;
    background: var(--primary-color);
    color: var(--white);
    padding: 20px 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.exp-badge .years {
    font-size: 18px;
    font-weight: 700;
}

.exp-badge .text {
    font-size: 12px;
    opacity: 0.8;
}

/* Contact */
.contact {
    padding: 100px 0;
    /* background: url('images/精工产品系列-静屿Pro门系列.png') no-repeat center/cover; */

    background: url('https://images.unsplash.com/photo-1497366216548-37526070297c?q=80&w=2000&auto=format&fit=crop') no-repeat center/cover;
    position: relative;
    background-attachment: fixed;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.9);
}

.contact-wrapper {
    position: relative;
    z-index: 1;
    display: block;
    max-width: 1200px;
    margin: 0 auto;
}

.section-header.left {
    text-align: left;
    margin-bottom: 40px;
}

.info-items {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.info-item .icon {
    width: 40px;
    height: 40px;
    background: var(--accent-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.info-item .details h4 {
    font-size: 16px;
    margin-bottom: 5px;
    color: var(--primary-color);
}

.info-item .details p {
    color: var(--text-gray);
    font-size: 14px;
}

.contact-form-box {
    background: var(--white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    font-size: 14px;
    transition: var(--transition);
}

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

/* Footer */
footer {
    background: #1a1a1a;
    color: #888;
    padding: 60px 0 30px;
    text-align: center;
}

.footer-logo h3 {
    color: var(--white);
    font-size: 24px;
    margin-bottom: 5px;
}

.footer-logo p {
    font-size: 12px;
    letter-spacing: 2px;
    margin-bottom: 30px;
}

.copyright {
    font-size: 12px;
    line-height: 1.8;
    border-top: 1px solid #333;
    padding-top: 30px;
}

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in {
    opacity: 0;
    transition: all 0.8s ease;
}

.fade-right {
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.8s ease;
}

.fade-left {
    opacity: 0;
    transform: translateX(30px);
    transition: all 0.8s ease;
}

.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }

/* Responsive */
@media (max-width: 992px) {
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .about-container,
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .about-image {
        order: -1;
    }
    
    .hero h1 {
        font-size: 48px;
    }
}

@media (max-width: 768px) {
    .navbar {
        background: var(--white);
        padding: 15px 0;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }

    .logo-img {
        /* 在移动端始终显示原色（或根据需要调整），因为背景是白色的 */
        filter: none;
        mix-blend-mode: normal;
        width: 150px; /* 稍微缩小 logo */
    }
    
    .nav-links {
        position: fixed;
        top: 70px; /* navbar height */
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        align-items: center;
        padding: 30px 0;
        gap: 20px;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        transform: translateY(-150%);
        transition: var(--transition);
        z-index: 999;
    }

    .nav-links.active {
        display: flex;
        transform: translateY(0);
    }

    .nav-links a {
        color: var(--text-dark);
        font-size: 18px;
    }
    
    .mobile-only {
        display: block;
        margin-top: 10px;
    }

    .mobile-only a {
        color: var(--white) !important;
        background-color: var(--accent-color);
        padding: 10px 30px;
        border-radius: 50px;
    }
    
    .hamburger {
        display: block;
        z-index: 1001;
    }

    .hamburger span {
        display: block;
        width: 25px;
        height: 3px;
        background: var(--primary-color);
        margin: 5px 0;
        transition: var(--transition);
    }
    
    /* Hamburger Animation */
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .nav-contact {
        display: none; /* 在移动端菜单中可能需要隐藏或另外处理电话按钮 */
    }

    /* 如果想在菜单里也显示电话，可以把 .nav-contact 移到 .nav-links 里，或者单独处理 */
    /* 这里为了简化，保持头部右侧是汉堡菜单，电话按钮可能不太好放，或者只留汉堡菜单 */
    
    /* 修正：在移动端保留电话按钮在头部右侧，汉堡菜单在最右侧 */
    .nav-container {
        padding: 0 15px;
    }

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

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
        padding: 0 20px;
    }

    .product-img {
        height: 250px;
    }

    .section-header h2 {
        font-size: 28px;
    }
    
    .product-info h3 {
        font-size: 20px;
    }

    .contact {
        background-attachment: scroll; /* 移动端背景固定可能导致性能问题或显示异常 */
    }
}