/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 - 精致深蓝金 */
    --primary: #0f172a;
    --primary-light: #1e293b;
    --accent-gold: #d4af37;
    --accent-gold-light: #e8c858;
    --accent-gold-dark: #b8922d;

    /* 辅助色 */
    --white: #ffffff;
    --off-white: #f8fafc;
    --silver: #e2e8f0;
    --silver-dark: #cbd5e1;
    --gray: #64748b;
    --gray-dark: #475569;
    --text-primary: #1e293b;
    --text-secondary: #64748b;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-gold: 0 0 30px rgba(212, 175, 55, 0.3);

    /* 渐变 */
    --gradient-gold: linear-gradient(135deg, #d4af37, #e8c858);
    --gradient-gold-reverse: linear-gradient(135deg, #e8c858, #d4af37);
    --gradient-blue: linear-gradient(135deg, #0f172a, #1e293b);
    --gradient-silver: linear-gradient(135deg, #f8fafc, #e2e8f0);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--white);
    overflow-x: hidden;
    position: relative;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-sm);
}

.navbar.scrolled {
    padding: 8px 0;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-lg);
}

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

.navbar.scrolled .nav-container {
    padding: 12px 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-gold);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.logo-icon i {
    font-size: 24px;
    color: var(--white);
}

.logo-text h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.5px;
}

.logo-text .tagline {
    font-size: 12px;
    color: var(--accent-gold);
    font-weight: 600;
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-dark);
    font-weight: 500;
    padding: 12px 20px;
    border-radius: 100px;
    transition: all 0.3s ease;
    position: relative;
    font-size: 15px;
}

.nav-link:hover {
    background: rgba(212, 175, 55, 0.08);
    color: var(--accent-gold);
}

.nav-link.active {
    background: var(--gradient-gold);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 8px;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--primary);
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* Banner */
.banner {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 88px;
    overflow: hidden;
}

.banner-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-blue);
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 50%, rgba(212, 175, 55, 0.15), transparent 50%),
                radial-gradient(circle at 70% 20%, rgba(212, 175, 55, 0.1), transparent 40%);
    pointer-events: none;
}

.banner-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23d4af37' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.banner-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(212, 175, 55, 0.2), transparent 60%);
    pointer-events: none;
}

.banner-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 40px;
    width: 100%;
    max-width: 900px;
}

.banner-floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.floating-element {
    position: absolute;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(212, 175, 55, 0.1);
    border-radius: 50%;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(212, 175, 55, 0.2);
    animation: float 6s ease-in-out infinite;
}

.floating-element i {
    font-size: 16px;
    color: var(--accent-gold);
}

.el-1 {
    top: 15%;
    left: 10%;
    animation-delay: 0s;
}

.el-2 {
    top: 25%;
    right: 15%;
    animation-delay: 2s;
}

.el-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

.banner-main {
    position: relative;
    z-index: 3;
}

.banner-badge {
    display: inline-block;
    background: rgba(212, 175, 55, 0.15);
    border: 1px solid rgba(212, 175, 55, 0.3);
    padding: 8px 24px;
    border-radius: 100px;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

.banner-badge span {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-gold);
    letter-spacing: 2px;
}

.banner-title {
    font-size: clamp(48px, 8vw, 72px);
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: 2px;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.banner-subtitle {
    font-size: clamp(20px, 3vw, 28px);
    color: var(--accent-gold);
    margin-bottom: 16px;
    font-weight: 500;
}

.banner-divider {
    width: 120px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
    margin: 24px auto;
}

.banner-description {
    font-size: clamp(16px, 2vw, 20px);
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.banner-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 40px;
    border-radius: 100px;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.cta-button.primary {
    background: var(--gradient-gold);
    color: var(--white);
    box-shadow: var(--shadow-lg), var(--shadow-gold);
}

.cta-button.primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.cta-button.primary:hover::before {
    width: 400px;
    height: 400px;
}

.cta-button.primary:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl), var(--shadow-gold);
}

.cta-button.secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.cta-button.secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-4px);
}

.banner-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.scroll-icon {
    width: 50px;
    height: 80px;
    border: 2px solid rgba(212, 175, 55, 0.4);
    border-radius: 30px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 12px;
    animation: bounce 2s ease-in-out infinite;
}

.scroll-icon i {
    font-size: 24px;
    color: var(--accent-gold);
    animation: scrollDown 1.5s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

@keyframes scrollDown {
    0%, 100% { opacity: 1; transform: translateY(0); }
    50% { opacity: 0.5; transform: translateY(20px); }
}

/* Section通用样式 */
.section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 72px;
}

.section-pre-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent-gold);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(36px, 5vw, 48px);
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

.section-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 20px;
}

.divider-line {
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-gold));
}

.divider-line:last-child {
    background: linear-gradient(90deg, var(--accent-gold), transparent);
}

.divider-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-gold);
    border-radius: 50%;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

/* 公司简介 */
.about {
    padding: 120px 0;
    background: var(--off-white);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text h3 {
    font-size: 24px;
    color: var(--primary);
    margin-bottom: 16px;
    margin-top: 40px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.about-text h3 i {
    color: var(--accent-gold);
    font-size: 20px;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
    font-size: 16px;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
    margin-top: 48px;
}

.feature-item {
    text-align: center;
    padding: 40px 24px;
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-gold);
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.feature-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: var(--gradient-gold);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: all 0.4s ease;
}

.feature-item:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-icon i {
    font-size: 36px;
    color: var(--white);
}

.feature-item h4 {
    font-size: 20px;
    color: var(--primary);
    margin-bottom: 12px;
    font-weight: 600;
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

.feature-border {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-gold);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.feature-item:hover .feature-border {
    width: 100px;
}

/* 产品中心 */
.products {
    padding: 120px 0;
    background: var(--white);
}

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

.product-card {
    background: var(--white);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    transform-style: preserve-3d;
}

.product-card:hover {
    transform: translateY(-16px) rotateX(2deg);
    box-shadow: var(--shadow-2xl);
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-gold);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 10;
}

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

.product-image {
    position: relative;
    height: 280px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-card:hover .product-image img {
    transform: scale(1.15);
    filter: brightness(1.05);
}

.product-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--gradient-gold);
    color: var(--white);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    z-index: 10;
    box-shadow: var(--shadow-md);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: var(--shadow-md), 0 0 0 0 rgba(212, 175, 55, 0.4); }
    50% { box-shadow: var(--shadow-md), 0 0 0 10px rgba(212, 175, 55, 0); }
}

.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.6), transparent);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 32px;
    opacity: 0;
    transition: all 0.4s ease;
    z-index: 5;
}

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

.product-info {
    transform: translateY(20px);
    transition: transform 0.4s ease;
}

.product-card:hover .product-info {
    transform: translateY(0);
}

.product-info h4 {
    font-size: 22px;
    color: var(--white);
    margin-bottom: 8px;
    font-weight: 600;
}

.product-info p {
    color: var(--accent-gold);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.product-cta {
    width: 48px;
    height: 48px;
    background: var(--gradient-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.product-cta:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-gold);
}

.product-cta i {
    font-size: 20px;
    color: var(--white);
}

.product-card-shadow {
    position: absolute;
    bottom: -20px;
    left: 10%;
    width: 80%;
    height: 20px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    filter: blur(10px);
    opacity: 0;
    transition: all 0.4s ease;
}

.product-card:hover .product-card-shadow {
    opacity: 1;
    bottom: -30px;
}

/* 加盟优势 */
.advantages {
    padding: 120px 0;
    background: var(--off-white);
}

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

.advantage-item {
    background: var(--white);
    padding: 40px;
    border-radius: 24px;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.advantage-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-gold);
    transition: width 0.4s ease;
}

.advantage-item:hover::before {
    width: 100%;
    opacity: 0.05;
}

.advantage-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.advantage-number {
    font-size: 48px;
    font-weight: 700;
    color: rgba(212, 175, 55, 0.2);
    position: absolute;
    top: 20px;
    right: 24px;
    line-height: 1;
}

.advantage-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.1), rgba(212, 175, 55, 0.2));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    border: 2px solid rgba(212, 175, 55, 0.2);
    transition: all 0.4s ease;
}

.advantage-item:hover .advantage-icon {
    background: var(--gradient-gold);
    border-color: transparent;
    transform: scale(1.1) rotate(5deg);
}

.advantage-icon i {
    font-size: 28px;
    color: var(--accent-gold);
    transition: all 0.4s ease;
}

.advantage-item:hover .advantage-icon i {
    color: var(--white);
}

.advantage-item h3 {
    font-size: 22px;
    color: var(--primary);
    margin-bottom: 12px;
    font-weight: 600;
}

.advantage-item p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 15px;
}

.advantage-border {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-gold);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.advantage-item:hover .advantage-border {
    width: 100px;
}

/* 联系我们 */
.contact {
    padding: 120px 0;
    background: var(--gradient-blue);
    color: var(--white);
}

.contact .section-title {
    color: var(--white);
}

.contact .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    padding: 32px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    text-decoration: none;
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(212, 175, 55, 0.3);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.contact-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-gold);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
    transition: all 0.4s ease;
}

.contact-item:hover .contact-icon {
    transform: scale(1.1) rotate(5deg);
}

.contact-icon i {
    font-size: 28px;
    color: var(--white);
}

.contact-text {
    margin-left: 20px;
    flex: 1;
}

.contact-text h3 {
    font-size: 16px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 6px;
}

.contact-text p {
    font-size: 20px;
    color: var(--accent-gold);
    font-weight: 700;
}

/* Footer */
.footer {
    background: #0a0f1a;
    padding: 120px 0 32px;
    position: relative;
    overflow: hidden;
}

.footer-wave {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    transform: translateY(-99%);
    pointer-events: none;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-section h3 {
    font-size: 18px;
    color: var(--white);
    margin-bottom: 24px;
    font-weight: 600;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-gold);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.footer-logo-icon i {
    font-size: 28px;
    color: var(--white);
}

.footer-logo h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 4px;
}

.footer-logo p {
    font-size: 13px;
    color: var(--accent-gold);
    font-weight: 600;
}

.footer-description {
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.8;
    font-size: 14px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-section ul li a:hover {
    color: var(--accent-gold);
    transform: translateX(4px);
}

.footer-section ul li a i {
    font-size: 12px;
    color: var(--accent-gold);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 56px;
    height: 56px;
    background: var(--gradient-gold);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-xl), var(--shadow-gold);
    z-index: 999;
    overflow: hidden;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2xl), var(--shadow-gold);
}

.back-to-top-icon {
    position: relative;
    z-index: 2;
}

.back-to-top-icon i {
    font-size: 22px;
}

.back-to-top-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background: var(--accent-gold-light);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    transition: transform 0.4s ease;
    z-index: 1;
}

.back-to-top:hover .back-to-top-glow {
    transform: translate(-50%, -50%) scale(1.5);
    opacity: 0;
}

/* Responsive */
@media (max-width: 992px) {
    .nav-menu {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .banner-title {
        font-size: 40px;
    }

    .banner-buttons {
        flex-direction: column;
    }

    .cta-button {
        width: 100%;
        justify-content: center;
    }

    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 80px 0;
    }
}

@media (max-width: 480px) {
    .banner-title {
        font-size: 32px;
    }

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

    .contact-item {
        flex-direction: column;
        text-align: center;
    }

    .contact-icon {
        margin-bottom: 16px;
    }
}

/* 动画类 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}