/* ===== CSS Variables ===== */
:root {
    --primary: #1a2b4c;
    --primary-light: #2a4070;
    --accent: #c41e3a;
    --accent-light: #e63955;
    --gold: #d4a843;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --bg-gray: #f1f3f5;
    --text-dark: #1a202c;
    --text-body: #2d3748;
    --text-muted: #718096;
    --text-light: #a0aec0;
    --border: #e2e8f0;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --radius: 12px;
    --radius-sm: 8px;
    --container: 1200px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-body);
    line-height: 1.7;
    background: var(--bg-white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ===== Container ===== */
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-icon {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    font-family: 'Noto Serif SC', serif;
    font-size: 22px;
    font-weight: 700;
    border-radius: 10px;
    transition: var(--transition);
}

.navbar.scrolled-on-dark .logo-icon {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.logo-name {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-dark);
    letter-spacing: 0.5px;
}

.logo-sub {
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 18px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-body);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transition: var(--transition);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 24px;
}

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

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

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f1b35 0%, #1a2b4c 40%, #2a4070 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(196, 30, 58, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(212, 168, 67, 0.08) 0%, transparent 50%);
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 60 60'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' 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");
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(15, 27, 53, 0.5) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 24px;
    max-width: 800px;
    animation: fadeInUp 1.2s ease;
}

.hero-tagline {
    display: inline-block;
    padding: 6px 20px;
    background: rgba(196, 30, 58, 0.15);
    border: 1px solid rgba(196, 30, 58, 0.3);
    border-radius: 30px;
    color: #ff6b7a;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 3px;
    margin-bottom: 28px;
}

.hero-title {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 700;
    color: #ffffff;
    line-height: 1.3;
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.hero-desc {
    font-size: clamp(15px, 2vw, 18px);
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.8;
    margin-bottom: 40px;
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    font-size: 15px;
    font-weight: 500;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 1px;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 16px rgba(196, 30, 58, 0.3);
}

.btn-primary:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(196, 30, 58, 0.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 1.5px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.6);
}

.btn-full {
    width: 100%;
}

.btn-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--accent);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-link:hover {
    gap: 12px;
    color: var(--accent-light);
}

/* ===== Hero Scroll Indicator ===== */
.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
}

.hero-scroll span {
    font-size: 12px;
    letter-spacing: 2px;
    display: block;
    margin-bottom: 8px;
}

.scroll-line {
    width: 1px;
    height: 40px;
    margin: 0 auto;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.5), transparent);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: #fff;
    animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
    0% { top: -50%; }
    100% { top: 100%; }
}

/* ===== Stats Section ===== */
.stats-section {
    background: var(--primary);
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 20px;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    font-family: 'Noto Serif SC', serif;
    font-size: 42px;
    font-weight: 700;
    color: #fff;
    line-height: 1;
    margin-bottom: 10px;
}

.stat-number span {
    font-size: 20px;
    color: var(--gold);
}

.stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 1px;
}

/* ===== Section Common ===== */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-label {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-title {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-desc {
    font-size: 16px;
    color: var(--text-muted);
}

/* ===== Intro Section ===== */
.intro-section {
    background: var(--bg-white);
    padding: 100px 0;
}

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

.intro-text .section-label {
    margin-bottom: 16px;
}

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

.intro-text p {
    font-size: 16px;
    color: var(--text-body);
    line-height: 1.9;
    margin-bottom: 16px;
}

.intro-text .btn-link {
    margin-top: 12px;
}

.intro-image-wrapper {
    position: relative;
    aspect-ratio: 4 / 5;
    border-radius: 20px;
    overflow: hidden;
}

.intro-image-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 20px;
}

.intro-image-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 30% 20%, rgba(196, 30, 58, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 70% 80%, rgba(212, 168, 67, 0.15) 0%, transparent 50%);
}

.intro-image-bg::after {
    content: '红帆';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'Noto Serif SC', serif;
    font-size: 120px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.08);
    letter-spacing: 10px;
}

.intro-image-content {
    position: relative;
    z-index: 2;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.intro-feature {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.intro-feature-icon {
    padding: 18px 36px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    color: #fff;
    font-size: 20px;
    font-weight: 500;
    text-align: center;
    letter-spacing: 4px;
    transition: var(--transition);
}

.intro-feature-icon:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(10px);
}

/* ===== About Section ===== */
.about-section {
    background: var(--bg-light);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 80px;
}

.about-card {
    background: #fff;
    padding: 40px 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-top: 3px solid transparent;
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-top-color: var(--accent);
}

.about-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 24px;
    color: var(--accent);
}

.about-icon svg {
    width: 100%;
    height: 100%;
}

.about-card h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 22px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 14px;
}

.about-card p {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.8;
}

/* ===== Timeline ===== */
.timeline-section {
    max-width: 800px;
    margin: 0 auto;
}

.timeline-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 28px;
    font-weight: 600;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 48px;
}

.timeline {
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), var(--primary));
}

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

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -32px;
    top: 4px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #fff;
    border: 3px solid var(--accent);
    z-index: 2;
}

.timeline-content {
    background: #fff;
    padding: 24px 28px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.timeline-content:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.timeline-year {
    display: inline-block;
    padding: 4px 14px;
    background: rgba(196, 30, 58, 0.1);
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 10px;
}

.timeline-content h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ===== Products Section ===== */
.products-section {
    background: var(--bg-white);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 80px;
}

.product-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.product-image {
    position: relative;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--bg-gray);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.08);
}

.product-badge {
    position: absolute;
    top: 14px;
    right: 14px;
    padding: 5px 14px;
    background: var(--accent);
    color: #fff;
    font-size: 12px;
    font-weight: 500;
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(196, 30, 58, 0.3);
}

.product-info {
    padding: 28px 24px;
}

.product-name {
    font-family: 'Noto Serif SC', serif;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
    line-height: 1.4;
}

.product-spec {
    font-size: 13px;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 12px;
}

.product-desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 16px;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.product-tags span {
    padding: 4px 12px;
    background: var(--bg-gray);
    color: var(--text-body);
    font-size: 12px;
    border-radius: 6px;
    transition: var(--transition);
}

.product-card:hover .product-tags span {
    background: rgba(196, 30, 58, 0.08);
    color: var(--accent);
}

/* ===== Service Guarantee ===== */
.service-guarantee {
    background: var(--bg-light);
    border-radius: 20px;
    padding: 56px 48px;
}

.guarantee-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 26px;
    font-weight: 600;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 40px;
}

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

.guarantee-item {
    text-align: center;
}

.guarantee-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 18px;
    color: var(--primary);
    background: rgba(26, 43, 76, 0.08);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.guarantee-icon svg {
    width: 32px;
    height: 32px;
}

.guarantee-item:hover .guarantee-icon {
    background: var(--accent);
    color: #fff;
    transform: translateY(-4px);
}

.guarantee-item h4 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.guarantee-item p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ===== Contact Section ===== */
.contact-section {
    background: var(--bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    align-items: start;
}

.contact-info-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 32px;
}

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

.contact-item-icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    background: rgba(26, 43, 76, 0.08);
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.contact-item:hover .contact-item-icon {
    background: var(--accent);
    color: #fff;
}

.contact-item-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-item-label {
    font-size: 13px;
    color: var(--text-muted);
}

.contact-item-value {
    font-size: 16px;
    color: var(--text-dark);
    font-weight: 500;
}

.contact-qr {
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.qr-placeholder {
    text-align: center;
    color: var(--text-muted);
}

.qr-placeholder svg {
    width: 80px;
    height: 80px;
    margin: 0 auto 12px;
    color: var(--primary);
}

.qr-placeholder span {
    font-size: 14px;
}

/* ===== Contact Form ===== */
.contact-form-wrapper {
    background: #fff;
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-group label span {
    color: var(--accent);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text-body);
    background: var(--bg-light);
    border: 1.5px solid transparent;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    background: #fff;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(196, 30, 58, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-tip {
    margin-top: 16px;
    font-size: 14px;
    text-align: center;
    min-height: 20px;
}

.form-tip.success {
    color: #2f855a;
}

.form-tip.error {
    color: var(--accent);
}

/* ===== Footer ===== */
.footer {
    background: var(--primary);
    color: rgba(255, 255, 255, 0.7);
    padding: 70px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr 1.5fr;
    gap: 48px;
    padding-bottom: 50px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-brand .logo-icon {
    width: 38px;
    height: 38px;
    font-size: 18px;
}

.footer-brand .logo-name {
    color: #fff;
    font-size: 16px;
    font-weight: 600;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    max-width: 300px;
}

.footer-col h4 {
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-col ul li {
    margin-bottom: 12px;
    font-size: 14px;
}

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: #fff;
    padding-left: 4px;
}

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

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: #fff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.back-to-top svg {
    width: 22px;
    height: 22px;
}

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

.back-to-top:hover {
    background: var(--accent);
    transform: translateY(-4px);
}

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

[data-animate] {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-animate].animated {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-item:nth-child(2) {
        border-right: none;
    }
    
    .stat-item:nth-child(1),
    .stat-item:nth-child(2) {
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        padding-bottom: 24px;
    }
    
    .intro-grid {
        gap: 48px;
    }
    
    .about-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 36px;
    }
}

@media (max-width: 768px) {
    section {
        padding: 64px 0;
    }
    
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 16px 24px 24px;
        gap: 4px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        display: block;
        padding: 14px 18px;
    }
    
    .nav-link::after {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        min-height: 90vh;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 200px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .stat-item {
        border-right: none !important;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        padding: 20px;
    }
    
    .stat-item:last-child {
        border-bottom: none;
    }
    
    .intro-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .intro-image-wrapper {
        max-width: 400px;
        margin: 0 auto;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    
    .service-guarantee {
        padding: 36px 24px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-form-wrapper {
        padding: 28px 20px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .nav-container {
        padding: 0 16px;
        height: 64px;
    }
    
    .logo-text {
        display: none;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-desc {
        font-size: 14px;
    }
    
    .stat-number {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .guarantee-grid {
        grid-template-columns: 1fr;
    }
    
    .product-info {
        padding: 20px 16px;
    }
    
    .product-name {
        font-size: 18px;
    }
}