/* ============================================================
   INDEX.CSS - Mobile First Responsive Stylesheet
   Rapid Impact Compaction Machine - Taian Hengda Machinery
   ============================================================ */

/* ==================== CSS VARIABLES ==================== */
:root {
    /* Primary Colors */
    --primary: #e63946;
    --primary-dark: #c1121f;
    --secondary: #1d3557;
    --accent: #f4a261;
    
    /* Neutral Colors */
    --white: #ffffff;
    --light: #f8f9fa;
    --light-blue: #e8f4f8;
    --text-dark: #1a1a2e;
    --text-muted: #6c757d;
    
    /* Gradients */
    --gradient-warm: linear-gradient(135deg, #fff5f5 0%, #fef3e2 100%);
    --gradient-cool: linear-gradient(135deg, #e8f4f8 0%, #f0f4ff 100%);
    --gradient-primary: linear-gradient(135deg, #e63946 0%, #f4a261 100%);
    --gradient-hero: linear-gradient(180deg, rgba(0,0,0,0.3) 0%, rgba(0,0,0,0.6) 100%);
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 4rem;
    
    /* Typography */
    --font-base: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 50px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.15);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

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

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

body {
    font-family: var(--font-base);
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

/* Prevent horizontal scroll */
html, body {
    max-width: 100vw;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== HEADER - MOBILE FIRST ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    padding: 10px 15px;
    max-width: 1280px;
    margin: 0 auto;
}

.logo {
    flex-shrink: 0;
}

.logo img {
    height: 36px;
    width: auto;
}

.nav-menu {
    margin-left: auto;
}

/* Hamburger Menu */
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 48px;
    height: 48px;
    background: var(--primary);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    z-index: 1001;
    box-shadow: var(--shadow-sm);
}

.hamburger {
    width: 22px;
    height: 3px;
    background: var(--white);
    position: relative;
    transition: var(--transition);
    border-radius: 2px;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 3px;
    background: var(--white);
    transition: var(--transition);
    border-radius: 2px;
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

/* Nav Toggle Active State */
.nav-toggle.active {
    background: var(--secondary);
}

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    transform: rotate(45deg);
    top: 0;
    background: var(--white);
}

.nav-toggle.active .hamburger::after {
    transform: rotate(-45deg);
    top: 0;
    background: var(--white);
}

/* Mobile Navigation */
.nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    padding: 80px var(--space-md) var(--space-lg);
    transition: right 0.4s ease;
    overflow-y: auto;
    overflow-x: hidden;
}

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

.nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.nav-link {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-dark);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    background: var(--light-blue);
    color: var(--primary);
}

.nav-link.nav-cta {
    background: var(--gradient-primary);
    color: var(--white);
    text-align: center;
    margin-top: var(--space-sm);
}

.nav-link.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ==================== HERO SECTION ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 60px;
    overflow: hidden;
}

.hero-image {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: var(--space-lg) 20px;
    color: var(--white);
    width: 100%;
    box-sizing: border-box;
}

.hero-tag {
    display: inline-block;
    background: var(--primary);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: var(--space-sm);
}

.hero h1 {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-bottom: var(--space-lg);
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    font-size: 1.33rem;
    font-weight: 800;
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: black;font-weight: 800;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--secondary);
    color: var(--white);
}

.btn-secondary:hover {
    background: #152a44;
    transform: translateY(-3px);
}

.btn-outline {
    background: transparent;
    border-color: var(--white);
    color: var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--secondary);
}

.btn-outline-light {
    background: transparent;
    border-color: var(--white);
    color: var(--white);
}

.btn-outline-light:hover {
    background: var(--white);
    color: var(--primary);
}

.btn-whatsapp {
    background: #25D366;
    color: var(--white);
}

.btn-whatsapp:hover {
    background: #1da851;
    transform: translateY(-3px);
}

.btn-card {
    background: var(--secondary);
    color: var(--white);
    width: 100%;
}

.btn-card:hover {
    background: var(--primary);
}

/* ==================== SPECS OVERVIEW ==================== */
.specs-overview {
    background: var(--gradient-warm);
    padding: var(--space-xl) 0;
    margin-top: -50px;
    position: relative;
    z-index: 10;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.spec-card {
    background: var(--white);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.spec-icon {
    width: 50px;
    height: 50px;
    margin: 0 auto var(--space-sm);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.25rem;
}

.spec-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--space-xs);
}

.spec-label {font-weight: bold;
    font-size: 1rem;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

/* ==================== SECTION HEADERS ==================== */
.section-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.section-tag {
    display: inline-block;
    background: var(--light-blue);
    color: var(--primary);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: var(--space-sm);
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--secondary);
    line-height: 1.3;
    margin-bottom: var(--space-sm);
}

.section-desc {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ==================== ABOUT SECTION ==================== */
.about-section {
    padding: var(--space-xxl) 0;
    background: var(--white);
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.about-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.about-image img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
}

.image-badge {
    position: absolute;
    bottom: var(--space-md);
    left: var(--space-md);
    background: var(--primary);
    color: var(--white);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.875rem;
}

.about-text .lead {
    font-size: 1.28rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--space-md);
}

.about-text .CaoBin {
    font-size: 1.18rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--space-md);
}

.about-text p {
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.about-features {
    margin: var(--space-lg) 0;
}

.about-features li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    font-weight: 500;
    color: var(--text-dark);
}

.about-features i {
    color: #28a745;
    font-size: 1.25rem;
}

/* ==================== PRODUCTS SECTION ==================== */
.products-section {
    padding: var(--space-xxl) 0;
    background: var(--gradient-cool);
}

.products-grid {
    display: grid;
    gap: var(--space-lg);
    padding: 0 2px;
}

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

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

.product-card.featured {
    border: 2px solid var(--primary);
}

.product-badge {
    position: absolute;
    top: var(--space-md);
    left: var(--space-md);
    background: var(--secondary);
    color: var(--white);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    z-index: 5;
}

.product-badge.hot {
    background: var(--primary);
}

.product-image {
    aspect-ratio: 16/10;
    overflow: hidden;
}

.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-content {
    padding: var(--space-md);
}

.product-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--space-xs);
}

.product-depth {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: var(--space-md);
}

.product-specs {
    margin-bottom: var(--space-md);
}

.product-specs li {
    display: flex;
    justify-content: space-between;
    padding: var(--space-xs) 0;
    border-bottom: 1px solid #eee;
    font-size: 0.9rem;
}

.product-specs li span {
    color: var(--text-muted);
}

.product-specs li strong {
    color: var(--secondary);
}

.products-cta {
    text-align: center;
    margin-top: var(--space-xl);
}

/* ==================== ADVANTAGES SECTION ==================== */
.advantages-section {
    padding: var(--space-xxl) 0;
    background: var(--white);
}

.advantage-row {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    padding: 0 2px;
}

.advantage-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.advantage-image img {
    width: 100%;
    aspect-ratio: 16/10;
    object-fit: cover;
}

.advantage-content {
    padding: var(--space-sm) 0;
}

.advantage-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--light-blue);
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.advantage-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: var(--space-sm);
}

.advantage-content p {
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.advantage-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) 0;
    font-weight: 500;
}

.advantage-list i {
    color: var(--primary);
    width: 20px;
}

/* ==================== 全球影响力通栏区 ==================== */
.global-impact-section {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding: 80px 0;
    overflow: hidden;
    background: var(--gradient-cool);
}

.impact-bg {
    position: absolute;
    inset: 0;
    z-index: 1;
    opacity: 0.15;
}

.impact-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.impact-overlay {
    position: absolute;
    inset: 0;
    background: transparent;
}

.impact-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 1000px;
    margin: 0 auto;
}

.impact-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    background: rgba(230,57,70,0.1);
    border: 1px solid rgba(230,57,70,0.2);
    border-radius: 24px;
    margin-bottom: 20px;
}

.impact-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1.3;
    margin-bottom: 16px;
}

.impact-desc {
    font-size: 16px;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 48px;
    line-height: 1.8;
}

/* 统计数据横排 */
.impact-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 40px;
    padding: 32px 24px;
    background: rgba(255,255,255,0.6);
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 16px;
}

.impact-stat-item {
    flex: 1;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 40px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.stat-number.large {
    font-size: 48px;
    color: var(--primary);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

.impact-divider {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, transparent, rgba(0,0,0,0.2), transparent);
}

/* 认证徽章 */
.impact-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-dark);
    background: rgba(255,255,255,0.5);
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 20px;
    transition: all 0.3s ease;
}

.badge:hover {
    background: rgba(230,57,70,0.1);
    border-color: rgba(230,57,70,0.3);
    color: var(--primary);
    transform: translateY(-2px);
}

.badge i { color: var(--primary); }

/* ==================== APPLICATIONS SECTION ==================== */
.applications-section {
    padding: var(--space-xxl) 0;
    background: var(--gradient-warm);
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.app-card {
    background: var(--white);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.app-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-sm);
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
}

.app-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--space-xs);
}

.app-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.applications-cta {
    text-align: center;
    margin-top: var(--space-xl);
}

/* ==================== PROJECTS SECTION ==================== */
.projects-section {
    padding: var(--space-xxl) 0;
    background: var(--gradient-cool);
}

.projects-grid {
    display: grid;
    gap: var(--space-lg);
    padding: 0 2px;
}

.project-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.project-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

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

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

.project-location {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    background: var(--primary);
    color: var(--white);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.project-content {
    padding: var(--space-md);
}

.project-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--space-xs);
}

.project-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.project-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.project-link:hover {
    gap: var(--space-sm);
}

.projects-cta {
    text-align: center;
    margin-top: var(--space-xl);
}

/* ==================== CTA SECTION ==================== */
.cta-section {
    padding: var(--space-xxl) 0;
    background: var(--gradient-primary);
    text-align: center;
}

.cta-content {
    padding: 0 20px;
}

.cta-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--space-sm);
}

.cta-content > p {
    color: rgba(255,255,255,0.9);
    margin-bottom: var(--space-lg);
}

.cta-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    padding: 0 10px;
}

.cta-email {
    color: var(--white);
    font-weight: 500;
}

.cta-email i {
    margin-right: var(--space-xs);
}

/* ==================== FOOTER ==================== */
.footer {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 50%, #90caf9 100%);
    color: var(--text-dark);
    padding: var(--space-xxl) 0 var(--space-lg);
}

.footer-vision {
    text-align: center;
    padding: 0 10px var(--space-xl);
    margin-bottom: var(--space-xl);
    border-bottom: 1px solid rgba(0,0,0,0.08);
}

.footer-vision h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--primary);
    font-weight: 700;
}

.footer-vision p {
    color: var(--text-dark);
    font-weight: 700;
    max-width: 600px;
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    padding: 0 5px;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: var(--space-md);
    color: var(--primary);
    font-weight: 700;
}

.footer-col ul li {
    margin-bottom: var(--space-sm);
}

.footer-col a {
    color: var(--text-dark);
    font-weight: 700;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--primary);
    padding-left: 5px;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-dark);
    font-weight: 700;
}

.contact-list i {
    color: var(--primary);
    width: 20px;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(0,0,0,0.08);
}

.footer-bottom p {
    color: var(--text-dark);
    font-weight: 700;
    font-size: 0.875rem;
    margin-bottom: var(--space-xs);
}

/* ==================== BACK TO TOP ==================== */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

/* ==================== TABLET STYLES (768px+) ==================== */
@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-lg);
    }
    
    /* 全球影响力通栏区 - 平板端 */
    .impact-title { font-size: 42px; }
    .impact-desc { font-size: 17px; }
    .impact-stats { padding: 40px 32px; gap: 24px; }
    .stat-number { font-size: 44px; }
    .stat-number.large { font-size: 56px; }
    .stat-label { font-size: 14px; }
    .impact-divider { height: 50px; }
    .badge { padding: 10px 20px; font-size: 13px; }
    
    .specs-grid,
    .applications-grid {
        padding: 0;
    }
    
    .cta-content {
        padding: 0;
    }
    
    .cta-buttons {
        padding: 0;
    }
    
    .products-grid,
    .projects-grid,
    .advantage-row {
        padding: 0;
    }
    
    .footer-grid,
    .footer-vision {
        padding-left: 0;
        padding-right: 0;
    }
    
    /* Header */
    .header-container {
        padding: var(--space-xs) 15px;
    }
    
    .logo img {
        height: 32px;
    }
    
    .nav-list {
        gap: 0;
    }
    
    .nav-toggle {
        display: none;
    }
    
    .nav-menu {
        position: static;
        width: auto;
        height: auto;
        background: transparent;
        box-shadow: none;
        padding: 0;
        overflow: visible;
    }
    
    .nav-list {
        flex-direction: row;
        gap: 0;
    }
    
    .nav-link {
        padding: 4px 3px;
        font-size: 0.65rem;
        white-space: nowrap;
    }
    
    .nav-link.nav-cta {
        margin-top: 0;
        margin-left: 2px;
        padding: 4px 6px;
        background: var(--primary);
    }
    
    /* Hero */
    .hero {
        margin-top: 70px;
    }
    
    .hero h1 {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-buttons {
        flex-direction: row;
        justify-content: center;
    }
    
    /* Specs */
    .specs-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-md);
    }
    
    .spec-value {
        font-size: 1.5rem;
    }
    
    /* Section Headers */
    .section-header h2 {
        font-size: 2.25rem;
    }
    
    /* About */
    .about-content {
        flex-direction: row;
        align-items: center;
    }
    
    .about-image,
    .about-text {
        flex: 1;
    }
    
    /* Products */
    .products-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    /* Advantages */
    .advantage-row {
        flex-direction: row;
        align-items: center;
    }
    
    .advantage-row.reverse {
        flex-direction: row-reverse;
    }
    
    .advantage-image,
    .advantage-content {
        flex: 1;
    }
    
    .advantage-content {
        padding: 0 var(--space-lg);
    }
    
    /* Applications */
    .applications-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-md);
    }
    
    /* Projects */
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    /* CTA */
    .cta-content h2 {
        font-size: 2.25rem;
    }
    
    .cta-buttons {
        flex-direction: row;
        justify-content: center;
    }
    
    /* Footer */
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ==================== DESKTOP STYLES (1024px+) ==================== */
@media (min-width: 1024px) {
    /* 全球影响力通栏区 - 桌面端 */
    .global-impact-section { min-height: 80vh; padding: 100px 0; }
    .impact-content { max-width: 1100px; }
    .impact-title { font-size: 52px; line-height: 1.2; }
    .impact-desc { font-size: 18px; margin-bottom: 56px; }
    .impact-stats { padding: 48px 40px; border-radius: 20px; }
    .stat-number { font-size: 52px; }
    .stat-number.large { font-size: 64px; }
    .stat-label { font-size: 15px; }
    .impact-divider { height: 60px; }
    .badge { padding: 12px 24px; font-size: 14px; }
    
    /* Header */
    .header-container {
        padding: 10px 30px;
        gap: 40px;
        justify-content: flex-start;
    }
    
    .nav-menu {
        margin-left: 0;
    }
    
    .nav-list {
        gap: 5px;
    }
    
    .logo img {
        height: 46px;
    }
    
    .nav-link {
        padding: 8px 12px;
        font-size: 0.92rem;
    }
    
    .nav-link.nav-cta {
        padding: 8px 18px;
    }
    
    /* Hero */
    .hero h1 {
        font-size: 3.5rem;
    }
    
    .hero-content {
        max-width: 800px;
    }
    
    /* Specs */
    .specs-overview {
        padding: var(--space-xxl) 0;
    }
    
    .spec-card {
        padding: var(--space-lg);
    }
    
    .spec-icon {
        width: 70px;
        height: 70px;
        font-size: 1.75rem;
    }
    
    .spec-value {
        font-size: 1.75rem;
    }
    
    /* Section Headers */
    .section-header h2 {
        font-size: 2.5rem;
    }
    
    /* About */
    .about-image img {
        aspect-ratio: 3/2;
    }
    
    .about-text .lead {
        font-size: 1.25rem;
    }
    
    /* Products */
    .product-content {
        padding: var(--space-lg);
    }
    
    .product-content h3 {
        font-size: 1.75rem;
    }
    
    /* Advantages */
    .advantage-row {
        gap: var(--space-xxl);
    }
    
    .advantage-number {
        font-size: 4rem;
    }
    
    .advantage-content h3 {
        font-size: 1.75rem;
    }
    
    /* Applications */
    .applications-grid {
        grid-template-columns: repeat(6, 1fr);
    }
    
    .app-card {
        padding: var(--space-lg);
    }
    
    /* Footer */
    .footer-vision p {
        font-size: 1.1rem;
    }
}

/* ==================== LARGE DESKTOP (1280px+) ==================== */
@media (min-width: 1280px) {
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .section-header h2 {
        font-size: 1.75rem;
    }
    
    .advantage-content {
        padding: 0 var(--space-xxl);
    }
}