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

:root {
    --primary-color: #1a1a2e;
    --secondary-color: #16213e;
    --accent-color: #c9a227;
    --accent-light: #e8d48a;
    --text-dark: #333;
    --text-light: #666;
    --text-white: #fff;
    --bg-light: #f8f9fa;
    --bg-white: #fff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 5px 30px rgba(0,0,0,0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
    line-height: 1.8;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: var(--accent-color);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.98);
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.logo-sub {
    font-size: 0.9rem;
    color: var(--accent-color);
}

.nav {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

.nav-list {
    display: flex;
    gap: 30px;
}

.nav-list a {
    font-size: 0.95rem;
    color: var(--text-dark);
    padding: 5px 0;
    position: relative;
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s;
}

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

.nav-list a:hover,
.nav-list a.active {
    color: var(--accent-color);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: all 0.3s;
}

.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slide.active {
    opacity: 1;
}

.slide-content {
    text-align: center;
    color: var(--text-white);
    z-index: 10;
}

.slide-content h1 {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 20px;
    letter-spacing: 5px;
    animation: fadeInUp 1s ease-out;
}

.tagline {
    font-size: 2rem;
    margin-bottom: 15px;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.sub-tagline {
    font-size: 1.2rem;
    opacity: 0.9;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.slider-dots {
    position: absolute;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 15px;
    z-index: 10;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: all 0.3s;
}

.dot.active {
    background: var(--accent-color);
    transform: scale(1.2);
}

.hero-scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    color: rgba(255,255,255,0.8);
    font-size: 0.9rem;
    z-index: 10;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid rgba(255,255,255,0.8);
    border-bottom: 2px solid rgba(255,255,255,0.8);
    transform: rotate(45deg);
    margin-top: 10px;
    animation: bounce 2s infinite;
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) rotate(45deg);
    }
    40% {
        transform: translateY(10px) rotate(45deg);
    }
    60% {
        transform: translateY(5px) rotate(45deg);
    }
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--accent-color);
    letter-spacing: 3px;
    text-transform: uppercase;
}

.intro {
    padding: 80px 0;
    background: var(--bg-light);
}

.intro-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.intro-content p {
    font-size: 1.1rem;
    line-height: 2;
    color: var(--text-light);
    margin-bottom: 20px;
}

.quick-nav {
    padding: 80px 0;
    background: var(--bg-white);
}

.quick-nav-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.quick-nav-item {
    padding: 30px;
    background: var(--bg-light);
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s;
}

.quick-nav-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-white);
}

.quick-nav-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.quick-nav-item h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.quick-nav-item p {
    font-size: 0.95rem;
    color: var(--text-light);
}

.about {
    padding: 100px 0;
    background: var(--bg-white);
}

.about-block {
    margin-bottom: 80px;
}

.about-block h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--accent-color);
    display: inline-block;
}

.about-content p {
    font-size: 1.05rem;
    line-height: 2;
    color: var(--text-light);
    margin-bottom: 20px;
}

.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, var(--accent-color), var(--primary-color));
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    padding-left: 30px;
    margin-bottom: 40px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -37px;
    top: 5px;
    width: 16px;
    height: 16px;
    background: var(--accent-color);
    border-radius: 50%;
    border: 3px solid var(--bg-white);
    box-shadow: 0 0 0 3px var(--accent-color);
}

.timeline-year {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--accent-color);
    margin-bottom: 10px;
}

.timeline-content h4 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 1rem;
    color: var(--text-light);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.advantage-card {
    background: var(--bg-light);
    padding: 40px 30px;
    border-radius: 10px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s;
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.advantage-number {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 3rem;
    font-weight: bold;
    color: rgba(201, 162, 39, 0.15);
}

.advantage-card h4 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.advantage-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.8;
}

.philosophy-block {
    text-align: center;
}

.philosophy {
    font-size: 1.8rem;
    color: var(--primary-color);
    letter-spacing: 3px;
}

.philosophy .separator {
    color: var(--accent-color);
    margin: 0 15px;
}

.stores {
    padding: 100px 0;
    background: var(--bg-light);
}

.stores-intro {
    max-width: 900px;
    margin: 0 auto 50px;
    text-align: center;
}

.stores-intro p {
    font-size: 1.05rem;
    line-height: 2;
    color: var(--text-light);
    margin-bottom: 15px;
}

.stores-note {
    color: var(--accent-color);
}

.stores-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.store-card {
    background: var(--bg-white);
    border-radius: 15px;
    padding: 40px;
    box-shadow: var(--shadow);
}

.store-region {
    margin-bottom: 20px;
}

.region-tag {
    display: inline-block;
    background: var(--accent-color);
    color: var(--text-white);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-bottom: 10px;
}

.store-region h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.store-desc {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 25px;
    line-height: 1.8;
}

.store-info {
    margin-bottom: 25px;
}

.store-item {
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}

.store-item:last-child {
    border-bottom: none;
}

.store-item h4 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.store-item p {
    font-size: 0.95rem;
    color: var(--text-light);
}

.store-contact {
    display: flex;
    align-items: center;
    gap: 15px;
    padding-top: 15px;
}

.contact-label {
    font-size: 0.9rem;
    color: var(--text-light);
}

.contact-value {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--accent-color);
}

.products {
    padding: 100px 0;
    background: var(--bg-white);
}

.products-note {
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: 8px;
    padding: 15px 20px;
    margin-bottom: 50px;
    text-align: center;
}

.products-note p {
    font-size: 0.95rem;
    color: #856404;
}

.product-series {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.product-series-item {
    border: 1px solid var(--border-color);
    border-radius: 15px;
    overflow: hidden;
    background: var(--bg-white);
}

.product-series-item.collapsed .series-products {
    max-height: 400px;
    overflow: hidden;
}

.product-series-item.collapsed .toggle-btn {
    background: linear-gradient(to top, var(--bg-light), transparent);
}

.series-header {
    padding: 30px;
    background: var(--primary-color);
    color: var(--text-white);
}

.series-header h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.series-header p {
    font-size: 0.95rem;
    opacity: 0.9;
    line-height: 1.6;
}

.series-products {
    transition: max-height 0.5s ease;
}

.product-row {
    display: grid;
    grid-template-columns: 180px 100px 1fr 200px;
    gap: 20px;
    padding: 15px 30px;
    border-bottom: 1px solid var(--border-color);
    align-items: center;
    font-size: 0.95rem;
}

.product-row.header-row {
    background: var(--bg-light);
    font-weight: bold;
    color: var(--primary-color);
}

.product-row:last-child {
    border-bottom: none;
}

.product-name {
    font-weight: bold;
    color: var(--primary-color);
}

.toggle-btn {
    width: 100%;
    padding: 20px;
    background: var(--bg-light);
    border: none;
    font-size: 1rem;
    color: var(--accent-color);
    cursor: pointer;
    transition: all 0.3s;
}

.toggle-btn:hover {
    background: var(--border-color);
}

.metallic-products {
    padding: 20px 30px;
}

.metallic-item {
    padding: 25px 0;
    border-bottom: 1px solid var(--border-color);
}

.metallic-item:last-child {
    border-bottom: none;
}

.metallic-item h4 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.metallic-item p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.8;
}

.fancy-categories {
    display: flex;
    gap: 40px;
    padding: 30px;
}

.fancy-category h4 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.fancy-category ul {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.fancy-category li {
    background: var(--bg-light);
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.95rem;
    color: var(--text-dark);
}

.fancy-desc {
    flex: 1;
}

.fancy-desc p {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.8;
}

.applications {
    padding: 100px 0;
    background: var(--bg-light);
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 30px;
}

.application-card {
    background: var(--bg-white);
    padding: 40px 25px;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.application-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.app-icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
}

.application-card h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.application-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
}

.services {
    padding: 100px 0;
    background: var(--bg-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--bg-light);
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.service-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.8;
}

.contact {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-white);
}

.contact .section-header h2 {
    color: var(--text-white);
}

.contact .section-subtitle {
    color: var(--accent-light);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-block {
    margin-bottom: 40px;
}

.contact-block h3 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: var(--accent-light);
}

.info-item {
    display: flex;
    margin-bottom: 20px;
    font-size: 1rem;
}

.info-label {
    width: 100px;
    color: rgba(255,255,255,0.7);
    flex-shrink: 0;
}

.info-value {
    color: var(--text-white);
}

.info-value a:hover {
    color: var(--accent-light);
}

.emails {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.store-summary {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.summary-item h4 {
    font-size: 1.1rem;
    color: var(--text-white);
    margin-bottom: 10px;
}

.summary-item p {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.8);
    margin-bottom: 5px;
}

.summary-item a {
    color: var(--accent-light);
    font-size: 0.95rem;
}

.contact-message {
    background: rgba(255,255,255,0.1);
    padding: 40px;
    border-radius: 15px;
}

.contact-message h3 {
    font-size: 1.5rem;
    color: var(--accent-light);
    margin-bottom: 25px;
}

.contact-message p {
    font-size: 1.05rem;
    line-height: 2;
    margin-bottom: 30px;
    opacity: 0.9;
}

.message-cta {
    display: flex;
    gap: 20px;
}

.cta-btn {
    padding: 15px 35px;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: bold;
    transition: all 0.3s;
    display: inline-block;
}

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

.cta-btn.primary:hover {
    background: var(--accent-light);
    color: var(--primary-color);
}

.cta-btn.secondary {
    background: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
}

.cta-btn.secondary:hover {
    background: var(--accent-color);
    color: var(--text-white);
}

.footer {
    background: #0d0d1a;
    color: rgba(255,255,255,0.8);
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-brand h3 {
    font-size: 1.5rem;
    color: var(--text-white);
    margin-bottom: 5px;
}

.footer-brand p {
    font-size: 0.95rem;
    color: var(--accent-light);
}

.footer-established {
    margin-top: 10px;
    font-size: 0.9rem;
    opacity: 0.7;
}

.footer-links {
    display: flex;
    gap: 80px;
}

.footer-col h4 {
    font-size: 1.1rem;
    color: var(--text-white);
    margin-bottom: 20px;
}

.footer-col ul li {
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.footer-col ul li a:hover {
    color: var(--accent-light);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.9rem;
}

@media (max-width: 1024px) {
    .quick-nav-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .applications-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: 40px;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .header-content {
        height: 60px;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        padding: 20px;
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s;
    }

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

    .nav-list {
        flex-direction: column;
        gap: 15px;
    }

    .nav-list a {
        display: block;
        padding: 10px 0;
        font-size: 1rem;
    }

    .hero {
        min-height: 500px;
    }

    .slide-content h1 {
        font-size: 2rem;
        letter-spacing: 2px;
    }

    .tagline {
        font-size: 1.3rem;
    }

    .sub-tagline {
        font-size: 1rem;
    }

    .slider-dots {
        bottom: 80px;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .quick-nav-grid {
        grid-template-columns: 1fr;
    }

    .quick-nav-item {
        padding: 25px;
    }

    .about-block h3 {
        font-size: 1.5rem;
    }

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

    .philosophy {
        font-size: 1.3rem;
        letter-spacing: 1px;
    }

    .philosophy .separator {
        margin: 0 8px;
    }

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

    .store-card {
        padding: 30px;
    }

    .product-row {
        grid-template-columns: 1fr;
        gap: 10px;
        padding: 20px;
    }

    .product-row.header-row {
        display: none;
    }

    .product-row span:not(.product-name) {
        font-size: 0.9rem;
        color: var(--text-light);
    }

    .product-row span:not(.product-name)::before {
        content: attr(data-label);
        font-weight: bold;
        color: var(--primary-color);
        display: block;
        margin-bottom: 3px;
    }

    .metallic-products {
        padding: 10px 20px;
    }

    .metallic-item {
        padding: 20px 0;
    }

    .metallic-item h4 {
        font-size: 1.1rem;
    }

    .fancy-categories {
        flex-direction: column;
        padding: 20px;
    }

    .applications-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .application-card {
        padding: 30px 20px;
    }

    .app-icon {
        font-size: 2.5rem;
    }

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

    .service-card {
        padding: 30px 25px;
    }

    .contact {
        padding: 60px 0;
    }

    .contact-message {
        padding: 30px 25px;
    }

    .message-cta {
        flex-direction: column;
    }

    .cta-btn {
        text-align: center;
    }

    .footer {
        padding: 40px 0 20px;
    }

    .footer-links {
        flex-direction: column;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .slide-content h1 {
        font-size: 1.6rem;
    }

    .tagline {
        font-size: 1.1rem;
    }

    .sub-tagline {
        font-size: 0.9rem;
    }

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