:root {
    --primary: #0A2647;
    --primary-light: #144272;
    --accent: #2C74B3;
    --accent-light: #205295;
    --gold: #C69749;
    --gold-light: #D4A95A;
    --bg: #FFFFFF;
    --bg-alt: #F8FAFC;
    --bg-dark: #0A2647;
    --text: #1E293B;
    --text-light: #64748B;
    --text-white: #F8FAFC;
    --border: #E2E8F0;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== NAVBAR ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 8px 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: white;
    transition: var(--transition);
}

.navbar.scrolled .nav-logo {
    color: var(--primary);
}

.logo-img {
    width: 42px;
    height: 42px;
    border-radius: 8px;
    object-fit: cover;
    border: 2px solid rgba(255,255,255,0.3);
    transition: var(--transition);
}

.nav-logo picture {
    display: flex;
}

.nav-logo picture img {
    width: 42px;
    height: 42px;
    border-radius: 8px;
    object-fit: cover;
    border: 2px solid rgba(255,255,255,0.3);
    transition: var(--transition);
}

.navbar.scrolled .nav-logo picture img {
    border-color: var(--border);
}

.navbar.scrolled .logo-img {
    border-color: var(--border);
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 1px;
}

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

.nav-link {
    text-decoration: none;
    color: rgba(255,255,255,0.85);
    padding: 8px 18px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: white;
    background: rgba(255,255,255,0.15);
}

.navbar.scrolled .nav-link {
    color: var(--text);
}

.navbar.scrolled .nav-link:hover,
.navbar.scrolled .nav-link.active {
    color: var(--accent);
    background: rgba(44,116,179,0.08);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.lang-toggle {
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.3);
    color: white;
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    letter-spacing: 1px;
    white-space: nowrap;
}

.lang-toggle:hover {
    background: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.5);
}

.navbar.scrolled .lang-toggle {
    background: rgba(44,116,179,0.08);
    border-color: var(--accent);
    color: var(--accent);
}

.navbar.scrolled .lang-toggle:hover {
    background: var(--accent);
    color: white;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: white;
    border-radius: 2px;
    transition: var(--transition);
}

.navbar.scrolled .nav-toggle span {
    background: var(--text);
}

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

.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transform: scale(1.05);
    animation: heroZoom 20s ease-in-out infinite alternate;
}

@keyframes heroZoom {
    0% { transform: scale(1.05); }
    100% { transform: scale(1.12); }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(10,38,71,0.92) 0%, rgba(20,66,114,0.8) 40%, rgba(44,116,179,0.65) 100%);
}

.hero-grid-lines {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 80px 80px;
    z-index: 1;
}

.hero-particles {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
}

.hero-particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: rgba(198,151,73,0.6);
    border-radius: 50%;
    animation: particleFloat linear infinite;
}

@keyframes particleFloat {
    0% { transform: translateY(0) translateX(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-100vh) translateX(40px); opacity: 0; }
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    z-index: 1;
    pointer-events: none;
}

.hero-glow-1 {
    width: 400px;
    height: 400px;
    background: rgba(44,116,179,0.15);
    top: 10%;
    right: 10%;
    animation: glowPulse 6s ease-in-out infinite alternate;
}

.hero-glow-2 {
    width: 300px;
    height: 300px;
    background: rgba(198,151,73,0.1);
    bottom: 15%;
    left: 5%;
    animation: glowPulse 8s ease-in-out infinite alternate-reverse;
}

@keyframes glowPulse {
    0% { transform: scale(1); opacity: 0.6; }
    100% { transform: scale(1.3); opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    padding: 0 24px;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.12);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 8px 24px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 28px;
    letter-spacing: 2px;
}

.hero-title {
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

html[lang="en"] .hero-title {
    font-size: clamp(28px, 4.5vw, 52px);
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    font-weight: 300;
    opacity: 0.85;
    margin-bottom: 40px;
    line-height: 1.6;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    border-radius: 100px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--gold);
    color: white;
    box-shadow: 0 4px 15px rgba(198,151,73,0.4);
}

.btn-primary:hover {
    background: var(--gold-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(198,151,73,0.5);
}

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

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: white;
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator {
    width: 26px;
    height: 42px;
    border: 2px solid rgba(255,255,255,0.4);
    border-radius: 13px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.scroll-indicator span {
    width: 3px;
    height: 8px;
    background: white;
    border-radius: 2px;
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(12px); opacity: 0.3; }
}

/* ========== STATS ========== */
.stats {
    background: var(--bg-dark);
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.stat-item {
    text-align: center;
    color: white;
}

.stat-number {
    font-size: 42px;
    font-weight: 900;
    color: var(--gold);
    line-height: 1;
    display: inline;
}

.stat-unit {
    font-size: 20px;
    color: var(--gold);
    font-weight: 700;
    display: inline;
}

.stat-label {
    margin-top: 8px;
    font-size: 14px;
    opacity: 0.7;
    font-weight: 400;
}

/* ========== SECTION HEADER ========== */
.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 4px;
    color: var(--accent);
    background: rgba(44,116,179,0.08);
    padding: 6px 20px;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-light);
    max-width: 560px;
    margin: 0 auto;
}

/* ========== PRODUCTS ========== */
.products {
    padding: 100px 0;
    background: var(--bg-alt);
}

.series-filter {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 28px;
    border: 2px solid var(--border);
    border-radius: 100px;
    background: white;
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.filter-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.filter-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.product-series {
    margin-bottom: 80px;
}

.product-series:last-child {
    margin-bottom: 0;
}

.product-series.hidden {
    display: none;
}

.series-header {
    position: relative;
    height: 220px;
    border-radius: var(--radius);
    overflow: hidden;
    background-size: cover;
    background-position: center;
    margin-bottom: 0;
}

.series-header-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(10,38,71,0.85), rgba(44,116,179,0.6));
}

.series-header-content {
    position: relative;
    z-index: 2;
    padding: 40px;
    color: white;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.series-badge {
    display: inline-block;
    background: var(--gold);
    width: fit-content;
    padding: 4px 18px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
}

.series-title {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 8px;
}

.series-desc {
    font-size: 15px;
    opacity: 0.8;
    font-weight: 300;
}

.series-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 16px 24px;
    background: white;
    border: 2px solid var(--border);
    border-top: none;
    border-radius: 0 0 var(--radius) var(--radius);
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    color: var(--accent);
    transition: var(--transition);
    margin-bottom: 24px;
}

.series-toggle:hover {
    background: var(--bg-alt);
    border-color: var(--accent);
}

.series-toggle-text {
    pointer-events: none;
}

.series-toggle-count {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-light);
    background: var(--bg-alt);
    padding: 2px 10px;
    border-radius: 100px;
}

.series-toggle-arrow {
    width: 18px;
    height: 18px;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.series-toggle.open .series-toggle-arrow {
    transform: rotate(180deg);
}

.product-grid-wrapper {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.6s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease;
    opacity: 0;
}

.product-grid-wrapper.open {
    max-height: 5000px;
    opacity: 1;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.product-card {
    background: white;
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.product-card-img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    display: block;
    background: #f1f5f9;
    transition: opacity 0.3s ease;
    opacity: 0;
}

.product-card-img[src]:not([src=""]) {
    opacity: 1;
}

.product-card-info {
    padding: 12px 14px;
}

.product-card-name {
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.product-card-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10,38,71,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.product-card-overlay span {
    color: white;
    font-size: 13px;
    font-weight: 500;
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(4px);
    padding: 8px 20px;
    border-radius: 100px;
    border: 1px solid rgba(255,255,255,0.3);
}

/* ========== ADVANTAGES ========== */
.advantages {
    padding: 100px 0;
    background: var(--bg);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.advantage-card {
    background: var(--bg-alt);
    border-radius: var(--radius);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

.advantage-card:hover {
    transform: translateY(-4px);
    background: white;
    border-color: var(--border);
    box-shadow: var(--shadow-lg);
}

.advantage-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--accent), var(--primary-light));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.advantage-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.advantage-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
}

.advantage-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ========== FACTORY ========== */
.factory {
    padding: 100px 0;
    background: var(--bg-alt);
}

.factory-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 20px;
}

.factory-main {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
}

.factory-main picture {
    display: contents;
}

.factory-main img {
    width: 100%;
    height: 100%;
    min-height: 400px;
    object-fit: cover;
    display: block;
}

.factory-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 16px 24px;
    background: linear-gradient(transparent, rgba(10,38,71,0.8));
    color: white;
    font-weight: 600;
}

.factory-side {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.factory-card {
    flex: 1;
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
}

.factory-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.factory-card picture {
    display: contents;
}

.factory-card-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 12px 20px;
    background: linear-gradient(transparent, rgba(10,38,71,0.8));
    color: white;
    font-size: 14px;
    font-weight: 600;
}

/* ========== CERT ========== */
.cert {
    padding: 100px 0;
    background: var(--bg);
}

.cert-grid {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.cert-card {
    max-width: 420px;
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.cert-card img {
    width: 100%;
    display: block;
}

.cert-card picture {
    display: contents;
}

.cert-card-caption {
    text-align: center;
    padding: 16px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

/* ========== ABOUT ========== */
.about {
    padding: 100px 0;
    background: var(--bg);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: center;
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: var(--radius);
    display: block;
    box-shadow: var(--shadow-xl);
}

.about-image picture {
    display: contents;
}

.about-image-decoration {
    position: absolute;
    bottom: -16px;
    right: -16px;
    width: 120px;
    height: 120px;
    border: 4px solid var(--gold);
    border-radius: var(--radius);
    z-index: -1;
}

.about-content .section-tag {
    text-align: left;
}

.about-content .section-title {
    text-align: left;
    margin-bottom: 24px;
}

.about-text {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 32px;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-icon {
    width: 28px;
    height: 28px;
    background: rgba(44,116,179,0.1);
    color: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
}

.about-feature span {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

/* ========== CONTACT ========== */
.contact {
    padding: 100px 0;
    background: var(--bg-alt);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
    align-items: start;
}

.contact-card {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 28px;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent), var(--primary-light));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 22px;
    height: 22px;
    color: white;
}

.contact-card h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.contact-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

.contact-form-wrapper {
    background: white;
    border-radius: var(--radius);
    padding: 36px;
    box-shadow: var(--shadow-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

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

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text);
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-alt);
}

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

.form-group textarea {
    resize: vertical;
}

/* ========== FOOTER ========== */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
}

.footer-logo picture {
    display: flex;
}

.footer-logo span {
    font-size: 18px;
    font-weight: 700;
}

.footer-brand p {
    font-size: 14px;
    opacity: 0.6;
    line-height: 1.7;
}

.footer-links h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 20px;
}

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-links li a,
.footer-links li {
    font-size: 14px;
    opacity: 0.6;
    text-decoration: none;
    color: white;
    transition: var(--transition);
}

.footer-links li a:hover {
    opacity: 1;
    color: var(--gold);
}

.footer-bottom {
    text-align: center;
    padding: 24px 0;
}

.footer-bottom p {
    font-size: 13px;
    opacity: 0.4;
}

/* ========== LIGHTBOX ========== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0,0,0,0.92);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-content {
    max-width: 85vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.lightbox-caption {
    color: white;
    margin-top: 16px;
    font-size: 14px;
    opacity: 0.7;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
    position: absolute;
    background: rgba(255,255,255,0.1);
    border: none;
    color: white;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-close {
    top: 24px;
    right: 24px;
}

.lightbox-prev {
    left: 24px;
    top: 50%;
    transform: translateY(-50%);
}

.lightbox-next {
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
    background: rgba(255,255,255,0.25);
}

/* ========== BACK TO TOP ========== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-light);
    transform: translateY(-3px);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

/* ========== ANIMATIONS ========== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
    .about-grid {
        gap: 40px;
    }
    .factory-grid {
        grid-template-columns: 1fr;
    }
    .factory-main img {
        min-height: 300px;
    }
    .factory-side {
        flex-direction: row;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: white;
        flex-direction: column;
        padding: 80px 24px 24px;
        gap: 4px;
        transition: var(--transition);
        box-shadow: var(--shadow-xl);
    }

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

    .nav-menu .nav-link {
        color: var(--text);
        padding: 12px 16px;
        border-radius: var(--radius-sm);
    }

    .nav-menu .nav-link:hover,
    .nav-menu .nav-link.active {
        color: var(--accent);
        background: rgba(44,116,179,0.08);
    }

    .nav-toggle {
        display: flex;
    }

    .nav-actions .lang-toggle {
        display: flex;
    }

    .nav-menu .lang-toggle {
        display: none;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

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

    .about-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about-image-decoration {
        display: none;
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 12px;
    }

    .series-header {
        height: 160px;
    }

    .series-header-content {
        padding: 24px;
    }

    .series-title {
        font-size: 22px;
    }

    .hero-title {
        font-size: clamp(28px, 7vw, 48px);
    }

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

    .factory-side {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .stat-number {
        font-size: 32px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

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