/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #eff6ff;
    --secondary: #8b5cf6;
    --secondary-light: #faf5ff;
    --success: #10b981;
    --success-light: #ecfdf5;
    --warning: #f97316;
    --warning-light: #fff7ed;
    --danger: #ef4444;
    --pink: #ec4899;
    --cyan: #06b6d4;
    --dark: #1e293b;
    --dark-2: #334155;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
    --gradient-warm: linear-gradient(135deg, #f97316 0%, #ec4899 100%);
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-700);
    background-color: var(--white);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

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

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

/* ==================== 页面区块通用样式 ==================== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 2px;
    margin-bottom: 16px;
    padding: 6px 16px;
    background: var(--primary-light);
    border-radius: 50px;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-desc {
    font-size: 18px;
    color: var(--gray-500);
    max-width: 640px;
    margin: 0 auto;
}

/* ==================== 导航栏 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

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

.logo-icon {
    width: 44px;
    height: 44px;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    border-radius: 12px;
}

.logo-icon svg {
    width: 28px;
    height: 28px;
}

.logo-text h1 {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
}

.logo-text span {
    font-size: 11px;
    color: var(--gray-400);
    letter-spacing: 2px;
    font-weight: 500;
}

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

.nav-link {
    display: block;
    padding: 10px 18px;
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-600);
    border-radius: 8px;
    position: relative;
}

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 26px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ==================== Hero区域 ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background:
            radial-gradient(ellipse at 10% 20%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
            radial-gradient(ellipse at 90% 80%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
            radial-gradient(ellipse at 50% 50%, rgba(16, 185, 129, 0.08) 0%, transparent 60%);
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background-image:
            linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
            linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 48px 48px;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 80px;
    align-items: center;
    padding: 60px 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 50px;
    font-size: 14px;
    color: var(--gray-600);
    box-shadow: var(--shadow-sm);
    margin-bottom: 32px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.2); }
}

.hero-title {
    font-size: 56px;
    font-weight: 900;
    line-height: 1.15;
    color: var(--gray-900);
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-title .highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.8;
    color: var(--gray-500);
    margin-bottom: 40px;
    max-width: 560px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--gray-200);
}

.stat-item {
    flex: 1;
}

.stat-number {
    font-size: 40px;
    font-weight: 800;
    color: var(--gray-900);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--gray-500);
}

.stat-divider {
    width: 1px;
    height: 48px;
    background: var(--gray-200);
}

.hero-visual {
    position: relative;
    height: 520px;
}

.hero-card {
    position: absolute;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 220px;
    border: 1px solid var(--gray-100);
}

.hero-card:nth-child(1) {
    top: 40px;
    right: 0;
}

.hero-card:nth-child(2) {
    top: 200px;
    left: 0;
}

.hero-card:nth-child(3) {
    bottom: 60px;
    right: 40px;
}

.floating {
    animation: floating 4s ease-in-out infinite;
}

.floating.delay-1 {
    animation-delay: 1s;
}

.floating.delay-2 {
    animation-delay: 2s;
}

@keyframes floating {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-16px); }
}

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

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

.card-icon.green {
    background: var(--success-light);
    color: var(--success);
}

.card-icon.purple {
    background: var(--secondary-light);
    color: var(--secondary);
}

.card-content h4 {
    font-size: 17px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.card-content p {
    font-size: 13px;
    color: var(--gray-500);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    z-index: 1;
}

.mouse {
    width: 26px;
    height: 42px;
    border: 2px solid var(--gray-400);
    border-radius: 13px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--gray-400);
    border-radius: 2px;
    animation: scroll-wheel 2s ease-in-out infinite;
}

@keyframes scroll-wheel {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(12px); opacity: 0; }
}

.scroll-indicator span {
    font-size: 13px;
    color: var(--gray-400);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(4px); }
}

/* ==================== 关于我们 ==================== */
.about {
    padding: 120px 0;
    background: var(--gray-50);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 80px;
    align-items: center;
}

.image-wrapper {
    position: relative;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    background: var(--white);
}

.image-placeholder svg {
    width: 100%;
    height: 100%;
}

.image-badge {
    position: absolute;
    bottom: 24px;
    right: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--gradient-warm);
    color: var(--white);
    border-radius: 50px;
    font-weight: 600;
    font-size: 14px;
    box-shadow: 0 8px 24px rgba(249, 115, 22, 0.4);
}

.image-badge svg {
    width: 20px;
    height: 20px;
}

.about-content h3 {
    font-size: 32px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 24px;
    line-height: 1.3;
}

.about-content > p {
    font-size: 16px;
    color: var(--gray-600);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 40px 0;
}

.feature {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.feature-icon.green {
    background: var(--success-light);
    color: var(--success);
}

.feature-icon.purple {
    background: var(--secondary-light);
    color: var(--secondary);
}

.feature h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.feature p {
    font-size: 14px;
    color: var(--gray-500);
}

.about-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 28px;
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

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

.info-label {
    font-size: 13px;
    color: var(--gray-400);
}

.info-value {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-900);
}

/* ==================== 核心业务 ==================== */
.services {
    padding: 120px 0;
    background: var(--white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.service-card {
    padding: 40px 32px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
    transform-origin: left;
}

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

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 28px;
    transition: var(--transition);
}

.service-icon.green {
    background: var(--success-light);
    color: var(--success);
}

.service-icon.purple {
    background: var(--secondary-light);
    color: var(--secondary);
}

.service-icon.orange {
    background: var(--warning-light);
    color: var(--warning);
}

.service-icon.pink {
    background: #fdf2f8;
    color: var(--pink);
}

.service-icon.cyan {
    background: #ecfeff;
    color: var(--cyan);
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(-5deg);
}

.service-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.service-card > p {
    font-size: 15px;
    color: var(--gray-500);
    margin-bottom: 24px;
    line-height: 1.7;
}

.service-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.service-list li {
    font-size: 14px;
    color: var(--gray-600);
    display: flex;
    align-items: center;
    gap: 10px;
}

.service-list li::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    flex-shrink: 0;
}

/* ==================== 产品方案 ==================== */
.products {
    padding: 120px 0;
    background: var(--gray-50);
}

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

.product-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

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

.product-placeholder {
    width: 100%;
    height: 100%;
}

.product-placeholder svg {
    width: 100%;
    height: 100%;
}

.product-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 14px;
    background: var(--primary);
    color: var(--white);
    font-size: 12px;
    font-weight: 600;
    border-radius: 50px;
}

.product-tag.green {
    background: var(--success);
}

.product-tag.purple {
    background: var(--secondary);
}

.product-tag.orange {
    background: var(--warning);
}

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

.product-content h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.product-content > p {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 20px;
    line-height: 1.7;
    min-height: 72px;
}

.product-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 20px;
    border-top: 1px solid var(--gray-100);
}

.product-meta > span {
    font-size: 12px;
    padding: 6px 12px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 50px;
    font-weight: 500;
}

.product-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}

.product-link:hover {
    color: var(--primary-dark);
}

/* ==================== 新闻动态 ==================== */
.news {
    padding: 120px 0;
    background: var(--white);
}

.news-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 28px;
}

.news-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-100);
    display: flex;
    flex-direction: column;
}

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

.news-image {
    position: relative;
    aspect-ratio: 3/2;
    overflow: hidden;
    flex-shrink: 0;
}

.news-image.small {
    aspect-ratio: 16/10;
}

.news-placeholder {
    width: 100%;
    height: 100%;
}

.news-placeholder svg {
    width: 100%;
    height: 100%;
}

.news-category {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 14px;
    background: var(--primary);
    color: var(--white);
    font-size: 12px;
    font-weight: 600;
    border-radius: 50px;
}

.news-category.green {
    background: var(--success);
}

.news-category.purple {
    background: var(--secondary);
}

.news-content {
    padding: 28px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.news-date {
    font-size: 13px;
    color: var(--gray-400);
    margin-bottom: 12px;
}

.news-content h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    line-height: 1.4;
}

.news-card:not(.featured) .news-content h3 {
    font-size: 18px;
    margin-bottom: 12px;
}

.news-content > p {
    font-size: 15px;
    color: var(--gray-500);
    margin-bottom: 24px;
    line-height: 1.7;
    flex: 1;
}

.news-card:not(.featured) .news-content > p {
    font-size: 14px;
    margin-bottom: 16px;
}

.news-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    align-self: flex-start;
}

.news-link:hover {
    color: var(--primary-dark);
}

/* ==================== 联系我们 ==================== */
.contact {
    padding: 120px 0;
    background: var(--gray-50);
}

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

.contact-info {
    display: flex;
    flex-direction: column;
}

.contact-info h3 {
    font-size: 32px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.contact-desc {
    font-size: 16px;
    color: var(--gray-500);
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 28px;
    margin-bottom: 40px;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon.green {
    background: var(--success-light);
    color: var(--success);
}

.contact-icon.purple {
    background: var(--secondary-light);
    color: var(--secondary);
}

.contact-icon.orange {
    background: var(--warning-light);
    color: var(--warning);
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.contact-item p {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.6;
}

.contact-license {
    padding: 28px;
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    margin-top: auto;
}

.contact-license h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 20px;
}

.license-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.license-info > div {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.license-info span {
    font-size: 13px;
    color: var(--gray-400);
}

.license-info strong {
    font-size: 15px;
    color: var(--gray-900);
    font-weight: 600;
}

.contact-form-wrapper {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 48px;
    box-shadow: var(--shadow-xl);
}

.contact-form-card h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.contact-form-card > p {
    font-size: 15px;
    color: var(--gray-500);
    margin-bottom: 36px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    font-size: 15px;
    color: var(--gray-900);
    background: var(--gray-50);
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}

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

/* ==================== 页脚 ==================== */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 80px 0 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 80px;
    padding-bottom: 60px;
}

.footer-brand .logo-text h1 {
    color: var(--white);
}

.footer-brand .logo-text span {
    color: var(--gray-500);
}

.footer-brand > p {
    font-size: 15px;
    line-height: 1.8;
    margin: 28px 0;
    max-width: 420px;
    color: var(--gray-400);
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-links a {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--gray-800);
    color: var(--gray-400);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-4px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 24px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.footer-col a {
    font-size: 14px;
    color: var(--gray-400);
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-bottom {
    padding: 28px 0;
    border-top: 1px solid var(--gray-800);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.copyright p {
    font-size: 14px;
    color: var(--gray-500);
}

.footer-links-bottom {
    display: flex;
    gap: 28px;
    margin-top: 8px;
}

.footer-links-bottom a {
    font-size: 13px;
    color: var(--gray-500);
}

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

/* ==================== 返回顶部 ==================== */
.back-to-top {
    position: fixed;
    right: 32px;
    bottom: 32px;
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.5);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
    .hero-title {
        font-size: 48px;
    }
    .section-title {
        font-size: 36px;
    }
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .news-grid {
        grid-template-columns: 1fr 1fr;
    }
    .news-card.featured {
        grid-column: 1 / -1;
    }
}

@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        gap: 4px;
        border-bottom: 1px solid var(--gray-200);
        transform: translateY(-120%);
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
    }
    .nav-menu.active {
        transform: translateY(0);
    }
    .menu-toggle {
        display: flex;
    }
    .hero-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    .hero-visual {
        height: 440px;
        max-width: 500px;
        margin: 0 auto;
        width: 100%;
    }
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    .footer-top {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
    .hero {
        min-height: auto;
    }
    .hero-title {
        font-size: 36px;
    }
    .hero-subtitle {
        font-size: 16px;
    }
    .hero-stats {
        gap: 24px;
        flex-wrap: wrap;
    }
    .stat-divider {
        display: none;
    }
    .section-title {
        font-size: 28px;
    }
    .section-desc {
        font-size: 16px;
    }
    .about,
    .services,
    .products,
    .news,
    .contact {
        padding: 80px 0;
    }
    .section-header {
        margin-bottom: 48px;
    }
    .services-grid,
    .products-grid,
    .news-grid,
    .about-features,
    .about-info,
    .footer-links,
    .form-row {
        grid-template-columns: 1fr;
    }
    .hero-visual {
        height: 400px;
    }
    .hero-card {
        min-width: 200px;
        padding: 16px;
    }
    .hero-card:nth-child(1) {
        top: 20px;
        right: 10px;
    }
    .hero-card:nth-child(2) {
        top: 160px;
        left: 10px;
    }
    .hero-card:nth-child(3) {
        bottom: 40px;
        right: 20px;
    }
    .contact-form-wrapper {
        padding: 32px 24px;
    }
    .footer {
        padding: 60px 0 0;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 30px;
    }
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }
    .btn {
        width: 100%;
    }
    .stat-number {
        font-size: 32px;
    }
    .contact-license {
        padding: 20px;
    }
}