:root {
    --color-deep: #59606d;
    --color-teal: #70acb1;
    --color-mint: #c6f1e7;
    --color-bg-light: #f0fff3;
    --color-white: #ffffff;
    --color-text-dark: #1a1a2e;
    --color-text-gray: #4a4a5a;
    --color-text-light: #6b6b7b;
    --color-border: #dde1e8;
    --color-shadow: rgba(89, 96, 109, 0.07);
    --color-shadow-hover: rgba(89, 96, 109, 0.16);
    --color-overlay: rgba(89, 96, 109, 0.75);
    --font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 16px;
    --max-width: 1200px;
    --nav-height: 70px;
    --nav-height-mobile: 60px;
    --section-padding: 80px;
    --section-padding-mobile: 50px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-light);
    color: var(--color-text-dark);
    line-height: 1.7;
    min-width: 320px;
    overflow-x: hidden;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
    background-color: var(--color-white);
    box-shadow: 0 2px 20px var(--color-shadow);
    transition: box-shadow var(--transition-normal);
}

.site-header.scrolled {
    box-shadow: 0 4px 28px rgba(89, 96, 109, 0.14);
}

.header-inner {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-height);
    transition: height var(--transition-normal);
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    flex-shrink: 0;
}

.logo-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-sm);
    background: linear-gradient(135deg, var(--color-deep) 0%, var(--color-teal) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-weight: 700;
    font-size: 20px;
    letter-spacing: 1px;
    flex-shrink: 0;
    line-height: 1;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-text .company-name {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-deep);
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.logo-text .company-sub {
    font-size: 11px;
    color: var(--color-text-light);
    letter-spacing: 1px;
    white-space: nowrap;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    list-style: none;
}

.main-nav li {
    position: relative;
}

.main-nav a {
    display: block;
    padding: 10px 18px;
    text-decoration: none;
    color: var(--color-text-dark);
    font-weight: 500;
    font-size: 15px;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    white-space: nowrap;
    letter-spacing: 0.3px;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-teal);
    background-color: rgba(112, 172, 177, 0.06);
}

.main-nav a.active {
    font-weight: 600;
}

.main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background-color: var(--color-teal);
    border-radius: 3px;
}

.hamburger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
    flex-direction: column;
    gap: 5px;
    width: 40px;
    height: 40px;
    justify-content: center;
    align-items: center;
    border-radius: var(--border-radius-sm);
    transition: background-color var(--transition-fast);
}

.hamburger-btn:hover {
    background-color: rgba(112, 172, 177, 0.08);
}

.hamburger-btn .bar {
    display: block;
    width: 24px;
    height: 2.5px;
    background-color: var(--color-deep);
    border-radius: 3px;
    transition: all var(--transition-normal);
    transform-origin: center;
}

.hamburger-btn.active .bar:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}
.hamburger-btn.active .bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.hamburger-btn.active .bar:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

.hero-section {
    position: relative;
    width: 100%;
    background: linear-gradient(160deg, #3d434f 0%, #59606d 35%, #4a525f 100%);
    overflow: hidden;
    min-height: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-bg-pattern {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.05;
    background-image:
        radial-gradient(circle at 20% 30%, #ffffff 1px, transparent 1px),
        radial-gradient(circle at 75% 60%, #ffffff 1px, transparent 1px),
        radial-gradient(circle at 50% 80%, #ffffff 1.5px, transparent 1.5px);
    background-size: 60px 60px, 80px 80px, 100px 100px;
    background-position: 0 0, 30px 20px, 15px 40px;
}

.hero-glow {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.12;
    pointer-events: none;
}
.hero-glow.glow-1 {
    top: -150px;
    right: -100px;
    background-color: var(--color-mint);
}
.hero-glow.glow-2 {
    bottom: -180px;
    left: -120px;
    background-color: var(--color-teal);
}

.hero-container {
    position: relative;
    z-index: 2;
    max-width: var(--max-width);
    width: 100%;
    margin: 0 auto;
    padding: 60px 24px;
    display: flex;
    align-items: center;
    gap: 50px;
    flex-wrap: wrap;
}

.hero-content {
    flex: 1 1 450px;
    min-width: 280px;
}

.hero-badge {
    display: inline-block;
    background-color: rgba(198, 241, 231, 0.18);
    color: var(--color-mint);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 1px;
    margin-bottom: 20px;
    border: 1px solid rgba(198, 241, 231, 0.3);
}

.hero-content h1 {
    font-size: clamp(28px, 4.5vw, 46px);
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.25;
    margin-bottom: 18px;
    letter-spacing: 1px;
}

.hero-content h1 .highlight {
    color: var(--color-mint);
    position: relative;
}

.hero-content .hero-desc {
    font-size: clamp(15px, 2vw, 18px);
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 560px;
}

.hero-buttons {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 28px;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    letter-spacing: 0.5px;
    transition: all var(--transition-normal);
    white-space: nowrap;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--color-teal);
    color: var(--color-white);
    box-shadow: 0 6px 22px rgba(112, 172, 177, 0.35);
}
.btn-primary:hover {
    background-color: #5a969b;
    box-shadow: 0 8px 28px rgba(112, 172, 177, 0.5);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.5);
}
.btn-outline:hover {
    border-color: var(--color-white);
    background-color: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

.hero-image-wrapper {
    flex: 1 1 380px;
    min-width: 280px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image-wrapper img {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    object-fit: cover;
    aspect-ratio: 4 / 3;
}

.section {
    padding: var(--section-padding) 24px;
}

.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-label {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--color-teal);
    text-transform: uppercase;
    margin-bottom: 10px;
    background-color: rgba(112, 172, 177, 0.08);
    padding: 5px 16px;
    border-radius: 20px;
}

.section-header h2 {
    font-size: clamp(26px, 3.5vw, 36px);
    font-weight: 700;
    color: var(--color-deep);
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.section-header .section-subtitle {
    font-size: 15px;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.section-divider {
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-teal), var(--color-mint));
    border-radius: 3px;
    margin: 16px auto 0;
}

.about-section {
    background-color: var(--color-white);
}

.about-grid {
    display: flex;
    gap: 50px;
    align-items: center;
    flex-wrap: wrap;
}

.about-image-col {
    flex: 1 1 380px;
    min-width: 280px;
    position: relative;
}

.about-image-col img {
    width: 100%;
    max-width: 540px;
    height: auto;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 12px 40px var(--color-shadow);
    object-fit: cover;
    aspect-ratio: 4 / 3;
}

.about-image-col .about-badge-card {
    position: absolute;
    bottom: -20px;
    right: 10px;
    background-color: var(--color-white);
    border-radius: var(--border-radius-md);
    padding: 18px 22px;
    box-shadow: 0 10px 30px var(--color-shadow-hover);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 2;
}

.about-badge-card .badge-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-teal);
    line-height: 1;
}
.about-badge-card .badge-label {
    font-size: 13px;
    color: var(--color-text-gray);
    line-height: 1.3;
}

.about-text-col {
    flex: 1 1 400px;
    min-width: 280px;
}

.about-text-col h2 {
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 700;
    color: var(--color-deep);
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.about-text-col p {
    font-size: 15px;
    color: var(--color-text-gray);
    line-height: 1.8;
    margin-bottom: 14px;
}

.about-features {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 20px;
}

.about-feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--color-deep);
    font-weight: 500;
    background-color: rgba(89, 96, 109, 0.04);
    padding: 8px 16px;
    border-radius: 20px;
    white-space: nowrap;
}

.about-feature-item .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-teal);
    flex-shrink: 0;
}

.products-section {
    background-color: var(--color-bg-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
}

.product-card {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 4px 18px var(--color-shadow);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px var(--color-shadow-hover);
}

.product-card-img {
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background-color: #e8ecf2;
    position: relative;
}

.product-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
    display: block;
}

.product-card:hover .product-card-img img {
    transform: scale(1.06);
}

.product-card-body {
    padding: 20px 22px 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.product-card-body h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-deep);
    margin-bottom: 8px;
    letter-spacing: 0.3px;
}

.product-card-body .product-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 500;
    color: var(--color-teal);
    background-color: rgba(112, 172, 177, 0.08);
    padding: 3px 10px;
    border-radius: 12px;
    margin-bottom: 10px;
    letter-spacing: 0.5px;
}

.product-card-body p {
    font-size: 13.5px;
    color: var(--color-text-light);
    line-height: 1.6;
    flex: 1;
}

.product-card-body .product-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: 14px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-teal);
    text-decoration: none;
    transition: gap var(--transition-fast);
}
.product-card-body .product-link:hover {
    gap: 8px;
}
.product-card-body .product-link .arrow {
    font-size: 16px;
    transition: transform var(--transition-fast);
}
.product-card-body .product-link:hover .arrow {
    transform: translateX(3px);
}

.advantages-section {
    background-color: var(--color-white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
}

.advantage-card {
    text-align: center;
    padding: 32px 20px;
    border-radius: var(--border-radius-lg);
    background-color: var(--color-bg-light);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.advantage-card:hover {
    border-color: var(--color-mint);
    background-color: var(--color-white);
    box-shadow: 0 10px 30px var(--color-shadow);
    transform: translateY(-3px);
}

.advantage-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(112, 172, 177, 0.12) 0%, rgba(198, 241, 231, 0.25) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    color: var(--color-teal);
    font-weight: 700;
    letter-spacing: 1px;
}

.advantage-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-deep);
    margin-bottom: 6px;
    letter-spacing: 0.3px;
}
.advantage-card p {
    font-size: 13px;
    color: var(--color-text-light);
    line-height: 1.5;
}

.brand-section {
    background-color: var(--color-bg-light);
}

.brand-marquee-wrap {
    overflow: hidden;
    position: relative;
    width: 100%;
}

.brand-track {
    display: flex;
    gap: 40px;
    align-items: center;
    animation: brandScroll 30s linear infinite;
    width: max-content;
}

.brand-track:hover {
    animation-play-state: paused;
}

@keyframes brandScroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

.brand-item {
    flex-shrink: 0;
    width: 140px;
    height: 70px;
    background-color: var(--color-white);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px var(--color-shadow);
    transition: all var(--transition-normal);
    overflow: hidden;
    padding: 10px;
}

.brand-item:hover {
    box-shadow: 0 8px 24px var(--color-shadow-hover);
    transform: translateY(-2px);
}

.brand-item img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    filter: grayscale(30%);
    transition: filter var(--transition-normal);
}

.brand-item:hover img {
    filter: grayscale(0%);
}

.news-section {
    background-color: var(--color-white);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 26px;
}

.news-card {
    background-color: var(--color-bg-light);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.news-card:hover {
    box-shadow: 0 12px 32px var(--color-shadow-hover);
    transform: translateY(-4px);
}

.news-card-img {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background-color: #dde3eb;
}

.news-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
    display: block;
}

.news-card:hover .news-card-img img {
    transform: scale(1.05);
}

.news-card-body {
    padding: 18px 20px 22px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news-card-body .news-date {
    font-size: 12px;
    color: var(--color-text-light);
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.news-card-body h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-deep);
    margin-bottom: 8px;
    line-height: 1.4;
    letter-spacing: 0.2px;
}

.news-card-body p {
    font-size: 13px;
    color: var(--color-text-gray);
    line-height: 1.5;
    flex: 1;
}

.news-card-body .news-author {
    font-size: 12px;
    color: var(--color-text-light);
    margin-top: 10px;
    font-style: italic;
}

.contact-section {
    background-color: var(--color-bg-light);
}

.contact-grid {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.contact-info-col {
    flex: 1 1 340px;
    min-width: 280px;
}

.contact-info-col h2 {
    font-size: clamp(22px, 3vw, 28px);
    font-weight: 700;
    color: var(--color-deep);
    margin-bottom: 10px;
}

.contact-info-col .contact-intro {
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: 24px;
}

.contact-info-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-info-list li {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    font-size: 14px;
    color: var(--color-text-gray);
    line-height: 1.5;
}

.contact-info-list .ci-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(112, 172, 177, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--color-teal);
    font-weight: 700;
    font-size: 16px;
}

.contact-info-list strong {
    display: block;
    color: var(--color-deep);
    font-size: 13px;
    letter-spacing: 0.5px;
    margin-bottom: 2px;
}

.contact-form-col {
    flex: 1 1 380px;
    min-width: 280px;
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: 30px 28px;
    box-shadow: 0 6px 24px var(--color-shadow);
}

.contact-form-col h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-deep);
    margin-bottom: 20px;
    letter-spacing: 0.3px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-gray);
    margin-bottom: 5px;
    letter-spacing: 0.3px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-family: inherit;
    color: var(--color-text-dark);
    transition: border-color var(--transition-fast);
    background-color: #fafbfc;
    resize: vertical;
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-teal);
    background-color: var(--color-white);
    box-shadow: 0 0 0 3px rgba(112, 172, 177, 0.08);
}

.form-group textarea {
    min-height: 100px;
    max-height: 200px;
}

.form-submit-btn {
    width: 100%;
    padding: 14px;
    background-color: var(--color-teal);
    color: var(--color-white);
    border: none;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    letter-spacing: 0.5px;
    transition: all var(--transition-normal);
    font-family: inherit;
    box-shadow: 0 4px 16px rgba(112, 172, 177, 0.3);
}

.form-submit-btn:hover {
    background-color: #5a969b;
    box-shadow: 0 8px 24px rgba(112, 172, 177, 0.45);
    transform: translateY(-1px);
}

.site-footer {
    width: 100%;
    background-color: #3d434f;
    color: rgba(255, 255, 255, 0.8);
    padding-top: 50px;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 36px;
    padding-bottom: 40px;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 16px;
    letter-spacing: 0.5px;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--color-mint);
    border-radius: 2px;
}

.footer-col p,
.footer-col li {
    font-size: 13px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.65);
    margin-bottom: 6px;
}

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

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-size: 13px;
}

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

.footer-bottom {
    width: 100%;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 18px 24px;
    text-align: center;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 16px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-bottom a:hover {
    color: var(--color-mint);
}

.footer-mobile-link {
    display: inline-block;
    padding: 6px 16px;
    background-color: rgba(198, 241, 231, 0.14);
    border-radius: 20px;
    color: var(--color-mint) !important;
    font-weight: 500;
    font-size: 12px;
    letter-spacing: 0.5px;
    border: 1px solid rgba(198, 241, 231, 0.35);
    transition: all var(--transition-fast);
}

.footer-mobile-link:hover {
    background-color: rgba(198, 241, 231, 0.24);
    border-color: var(--color-mint);
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--color-teal);
    color: var(--color-white);
    border: none;
    cursor: pointer;
    font-size: 20px;
    font-weight: 700;
    box-shadow: 0 4px 16px rgba(112, 172, 177, 0.35);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(15px);
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

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

.back-to-top:hover {
    background-color: #5a969b;
    transform: translateY(-3px);
    box-shadow: 0 8px 22px rgba(112, 172, 177, 0.5);
}

@media (max-width: 1024px) {
    .hero-container {
        gap: 30px;
        padding: 40px 24px;
    }
    .hero-section {
        min-height: auto;
    }
    .about-grid {
        gap: 30px;
    }
    .about-image-col .about-badge-card {
        bottom: -14px;
        right: 0;
        padding: 14px 16px;
    }
    .about-badge-card .badge-number {
        font-size: 26px;
    }
    .section {
        padding: var(--section-padding-mobile) 24px;
    }
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .header-inner {
        height: var(--nav-height-mobile);
        padding: 0 16px;
    }
    .logo-icon {
        width: 36px;
        height: 36px;
        font-size: 16px;
    }
    .logo-text .company-name {
        font-size: 15px;
    }
    .logo-text .company-sub {
        font-size: 10px;
    }

    .hamburger-btn {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background-color: var(--color-white);
        flex-direction: column;
        padding: 90px 28px 40px;
        gap: 4px;
        box-shadow: -8px 0 30px rgba(0, 0, 0, 0.15);
        transition: right var(--transition-normal);
        z-index: 999;
        overflow-y: auto;
    }

    .main-nav.open {
        right: 0;
    }

    .main-nav a {
        padding: 13px 18px;
        font-size: 16px;
        border-radius: var(--border-radius-sm);
        width: 100%;
    }

    .main-nav a.active::after {
        display: none;
    }
    .main-nav a.active {
        background-color: rgba(112, 172, 177, 0.08);
        border-left: 3px solid var(--color-teal);
        border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    }

    .nav-overlay {
        position: fixed;
        inset: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 998;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .hero-container {
        flex-direction: column;
        text-align: center;
        padding: 30px 16px;
    }
    .hero-content {
        flex: auto;
        min-width: auto;
    }
    .hero-content .hero-desc {
        max-width: 100%;
    }
    .hero-buttons {
        justify-content: center;
    }
    .hero-image-wrapper img {
        max-width: 320px;
    }

    .about-grid {
        flex-direction: column;
        text-align: center;
    }
    .about-image-col .about-badge-card {
        right: 50%;
        transform: translateX(50%);
        bottom: -18px;
    }
    .about-features {
        justify-content: center;
    }

    .products-grid {
        grid-template-columns: 1fr;
        max-width: 420px;
        margin: 0 auto;
    }
    .news-grid {
        grid-template-columns: 1fr;
        max-width: 420px;
        margin: 0 auto;
    }
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }
    .advantage-card {
        padding: 22px 14px;
    }
    .advantage-icon {
        width: 46px;
        height: 46px;
        font-size: 20px;
        margin-bottom: 10px;
    }

    .contact-grid {
        flex-direction: column;
    }
    .contact-form-col {
        padding: 22px 18px;
    }

    .brand-item {
        width: 110px;
        height: 55px;
    }
    .brand-track {
        gap: 20px;
    }

    .footer-inner {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        font-size: 11px;
    }

    .back-to-top {
        bottom: 20px;
        right: 16px;
        width: 38px;
        height: 38px;
        font-size: 17px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 24px;
    }
    .hero-content .hero-desc {
        font-size: 14px;
    }
    .btn {
        padding: 11px 22px;
        font-size: 13px;
    }
    .advantages-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
    .advantage-card {
        padding: 16px 10px;
    }
    .advantage-card h3 {
        font-size: 14px;
    }
    .footer-inner {
        grid-template-columns: 1fr;
    }
    .section-header h2 {
        font-size: 22px;
    }
    .about-text-col h2 {
        font-size: 20px;
    }
    .product-card-body h3 {
        font-size: 16px;
    }
}