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

:root {
    --primary-color: #1e40af;
    --primary-light: #3b82f6;
    --primary-dark: #1e3a8a;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-medium: #4b5563;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: 'Noto Serif SC', serif;
    font-weight: 600;
    line-height: 1.3;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    background: rgba(255, 255, 255, 0.98);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

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

.logo-mark {
    height: 46px;
    width: auto;
    display: block;
    flex-shrink: 0;
}

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

.logo-zh {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    font-family: 'Noto Serif SC', serif;
}

.logo-en {
    font-size: 9px;
    color: var(--text-light);
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-medium);
    position: relative;
    transition: var(--transition);
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

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

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== 首页横幅 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 50%, #2563eb 100%);
    color: white;
    padding-top: 72px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.gradient-overlay {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.4) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(96, 165, 250, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(147, 197, 253, 0.2) 0%, transparent 50%);
}

.floating-shapes {
    position: absolute;
    inset: 0;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: #60a5fa;
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: #93c5fd;
    bottom: 20%;
    left: 15%;
    animation-delay: 5s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    background: #bfdbfe;
    top: 60%;
    right: 30%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    33% {
        transform: translate(30px, -30px) rotate(120deg);
    }
    66% {
        transform: translate(-20px, 20px) rotate(240deg);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    padding: 0 24px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 24px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    font-size: 14px;
    letter-spacing: 2px;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
    animation: fadeInDown 1s ease;
}

.hero-title {
    font-size: clamp(32px, 6vw, 56px);
    margin-bottom: 24px;
    animation: fadeInUp 1s ease 0.2s both;
}

.title-line {
    display: block;
    font-size: 20px;
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: 8px;
    margin-bottom: 16px;
}

.title-main {
    display: block;
    font-weight: 700;
}

.hero-subtitle {
    font-size: clamp(20px, 3vw, 28px);
    font-weight: 500;
    margin-bottom: 16px;
    color: #e0e7ff;
    animation: fadeInUp 1s ease 0.4s both;
}

.hero-description {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto 48px;
    line-height: 1.8;
    animation: fadeInUp 1s ease 0.6s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
    margin-bottom: 48px;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.8s both;
}

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

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: white;
}

.stat-unit {
    font-size: 24px;
    font-weight: 600;
    color: #93c5fd;
}

.stat-label {
    display: block;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 4px;
    letter-spacing: 1px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.3);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 1s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    font-size: 15px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: #f3f4f6;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.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-block {
    width: 100%;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
    letter-spacing: 2px;
}

.scroll-arrow {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.7), transparent);
    margin: 12px auto 0;
    animation: scrollDown 2s infinite;
}

@keyframes scrollDown {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform: scaleY(1); transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== 通用 Section 样式 ===== */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 14px;
    font-weight: 500;
    color: var(--primary-color);
    letter-spacing: 4px;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(28px, 4vw, 42px);
    color: var(--text-dark);
    margin-bottom: 16px;
}

.section-line {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 2px;
    margin: 0 auto;
}

.section-header.light .section-tag,
.section-header.light .section-title {
    color: white;
}

/* ===== 产品展示 ===== */
.products {
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 50%, #f8fafc 100%);
    position: relative;
    overflow: hidden;
}

.products::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(239, 68, 68, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.products-intro {
    text-align: center;
    color: var(--text-gray);
    font-size: 16px;
    max-width: 600px;
    margin: -32px auto 48px;
    line-height: 1.8;
}

.products-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    position: relative;
    z-index: 1;
}

.product-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    border: 1px solid rgba(0, 0, 0, 0.04);
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.12);
}

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

.product-visual {
    position: relative;
    height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    overflow: hidden;
    transition: background 0.5s ease;
}

/* 各产品默认底色 - 匹配产品金属特性 */
.product-copper .product-visual {
    background: linear-gradient(135deg, #fff7ed 0%, #fed7aa 100%);
}

.product-aluminum .product-visual {
    background: linear-gradient(135deg, #f8fafc 0%, #cbd5e1 100%);
}

.product-zinc .product-visual {
    background: linear-gradient(135deg, #f0f9ff 0%, #bae6fd 100%);
}

.product-lead .product-visual {
    background: linear-gradient(135deg, #f1f5f9 0%, #94a3b8 100%);
}

.product-nickel .product-visual {
    background: linear-gradient(135deg, #f1f5f9 0%, #cbd5e1 100%);
}

.product-tin .product-visual {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.product-glow {
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    opacity: 0.3;
    filter: blur(40px);
    transition: all 0.4s ease;
}

.product-copper .product-glow {
    background: #ea580c;
}

.product-aluminum .product-glow {
    background: #64748b;
}

.product-zinc .product-glow {
    background: #0ea5e9;
}

.product-lead .product-glow {
    background: #475569;
}

.product-nickel .product-glow {
    background: #64748b;
}

.product-tin .product-glow {
    background: #94a3b8;
}

.product-card:hover .product-glow {
    opacity: 0.5;
    transform: scale(1.2);
}

.product-img {
    width: 100%;
    height: 100%;
    position: relative;
    z-index: 1;
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    object-fit: cover;
    border-radius: 4px;
}

.product-card:hover .product-img {
    transform: scale(1.08) rotate(-2deg);
}

.product-overlay {
    position: absolute;
    top: 16px;
    left: 16px;
    z-index: 2;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.product-card:hover .product-overlay {
    opacity: 1;
    transform: translateY(0);
}

.product-tag {
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.9), rgba(59, 130, 246, 0.9));
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
    white-space: nowrap;
}

.product-info {
    padding: 28px;
}

.product-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.product-info h3 {
    font-size: 22px;
    color: var(--text-dark);
    margin-bottom: 10px;
    font-weight: 700;
}

.product-info > p {
    color: var(--text-gray);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.product-specs {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.product-specs span {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
}

/* 产品卡片悬停光效 - 更鲜明的产品特色底色 */
.product-copper:hover .product-visual {
    background: linear-gradient(135deg, #fff7ed 0%, #fb923c 100%);
}

.product-aluminum:hover .product-visual {
    background: linear-gradient(135deg, #f1f5f9 0%, #94a3b8 100%);
}

.product-zinc:hover .product-visual {
    background: linear-gradient(135deg, #e0f2fe 0%, #7dd3fc 100%);
}

.product-lead:hover .product-visual {
    background: linear-gradient(135deg, #e2e8f0 0%, #64748b 100%);
}

.product-nickel:hover .product-visual {
    background: linear-gradient(135deg, #e2e8f0 0%, #94a3b8 100%);
}

.product-tin:hover .product-visual {
    background: linear-gradient(135deg, #f1f5f9 0%, #cbd5e1 100%);
}

/* 产品统计条 */
.product-stats-bar {
    margin-top: 64px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(30, 64, 175, 0.3);
    position: relative;
    overflow: hidden;
}

.product-stats-bar::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 50%);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.stat-block {
    display: flex;
    align-items: center;
    gap: 16px;
    position: relative;
    z-index: 1;
}

.stat-icon {
    width: 56px;
    height: 56px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
}

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

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: white;
    line-height: 1;
}

.stat-value .unit {
    font-size: 14px;
    font-weight: 500;
    margin-left: 2px;
}

.stat-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 4px;
}

/* 动态分隔线 */
.section-divider {
    height: 80px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, transparent 0%, rgba(59, 130, 246, 0.03) 50%, transparent 100%);
}

.divider-particles {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
}

.divider-particles span {
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
    top: 50%;
    left: calc(10% + var(--i, 0) * 9%);
    opacity: 0.4;
    animation: particleFloat 3s ease-in-out infinite;
    animation-delay: calc(var(--i, 0) * 0.3s);
}

.divider-particles span:nth-child(1) { --i: 0; }
.divider-particles span:nth-child(2) { --i: 1; }
.divider-particles span:nth-child(3) { --i: 2; }
.divider-particles span:nth-child(4) { --i: 3; }
.divider-particles span:nth-child(5) { --i: 4; }
.divider-particles span:nth-child(6) { --i: 5; }
.divider-particles span:nth-child(7) { --i: 6; }
.divider-particles span:nth-child(8) { --i: 7; }
.divider-particles span:nth-child(9) { --i: 8; }
.divider-particles span:nth-child(10) { --i: 9; }

@keyframes particleFloat {
    0%, 100% {
        transform: translateY(0) scale(1);
        opacity: 0.4;
    }
    50% {
        transform: translateY(-20px) scale(1.5);
        opacity: 0.8;
    }
}

/* ===== 公司概况 ===== */
.about {
    background: var(--bg-white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    margin-bottom: 80px;
}

.about-text p {
    font-size: 16px;
    color: var(--text-medium);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-lead {
    font-size: 18px !important;
    color: var(--text-dark) !important;
    font-weight: 500;
}

.about-text strong {
    color: var(--primary-color);
}

.about-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 32px;
}

.feature-item {
    text-align: center;
    padding: 20px;
    background: var(--bg-light);
    border-radius: 12px;
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.feature-item h4 {
    font-size: 16px;
    margin-bottom: 4px;
    color: var(--text-dark);
}

.feature-item p {
    font-size: 13px;
    color: var(--text-light);
    margin: 0;
}

.about-image {
    display: flex;
    justify-content: center;
}

.image-placeholder {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    background: linear-gradient(135deg, #e0e7ff 0%, #dbeafe 100%);
    border-radius: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.building-icon {
    width: 200px;
    height: 200px;
    margin-bottom: 24px;
}

.image-caption {
    font-size: 16px;
    color: var(--primary-color);
    font-weight: 500;
}

/* 子公司 */
.subsidiaries-title {
    text-align: center;
    font-size: 24px;
    margin-bottom: 40px;
    color: var(--text-dark);
}

.subsidiaries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 20px;
}

.sub-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px 16px;
    text-align: center;
    transition: var(--transition);
}

.sub-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.sub-logo {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.sub-card h4 {
    font-size: 14px;
    color: var(--text-dark);
}

/* ===== 业务布局 ===== */
.business {
    background: var(--bg-light);
}

.business-intro {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}

.business-intro p {
    font-size: 17px;
    color: var(--text-medium);
    line-height: 1.8;
}

.business-intro strong {
    color: var(--primary-color);
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.business-card {
    background: white;
    border-radius: 16px;
    padding: 40px 32px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.business-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

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

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

.business-card.featured {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.business-card.featured::before {
    display: none;
}

.featured-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 12px;
    color: white;
}

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

.business-card.featured .card-icon {
    color: white;
}

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

.business-card h3 {
    font-size: 22px;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.business-card.featured h3 {
    color: white;
}

.business-card p {
    font-size: 15px;
    color: var(--text-medium);
    margin-bottom: 20px;
    line-height: 1.7;
}

.business-card.featured p {
    color: rgba(255, 255, 255, 0.9);
}

.business-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.business-list li {
    padding-left: 24px;
    position: relative;
    font-size: 14px;
    color: var(--text-medium);
}

.business-card.featured .business-list li {
    color: rgba(255, 255, 255, 0.9);
}

.business-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-color);
}

.business-card.featured .business-list li::before {
    background: white;
}

/* ===== 经营业绩 ===== */
.performance {
    background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 100%);
    color: white;
}

.performance-timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto 80px;
}

.performance-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    background: rgba(255, 255, 255, 0.3);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 60px;
    position: relative;
}

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

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-year {
    width: 160px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    text-align: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.year-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
}

.year-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 12px;
}

.timeline-content {
    flex: 1;
    padding: 24px 32px;
    margin: 0 32px;
}

.timeline-number {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 8px;
    color: #93c5fd;
}

.timeline-number .unit {
    font-size: 24px;
    font-weight: 500;
    margin-left: 4px;
}

.timeline-label {
    font-size: 18px;
    color: white;
    margin-bottom: 12px;
}

.timeline-content p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

.timeline-item::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    border: 4px solid white;
    border-radius: 50%;
    z-index: 1;
}

.timeline-item.highlight::after {
    background: var(--accent-color);
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.5);
}

.performance-awards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.award-card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.award-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
}

.award-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.award-card h4 {
    font-size: 18px;
    margin-bottom: 8px;
    color: white;
}

.award-card p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

/* ===== 核心优势 ===== */
.advantage {
    background: var(--bg-white);
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.advantage-item {
    padding: 40px 32px;
    background: var(--bg-light);
    border-radius: 16px;
    position: relative;
    transition: var(--transition);
    border: 1px solid transparent;
}

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

.advantage-number {
    position: absolute;
    top: 24px;
    right: 24px;
    font-size: 48px;
    font-weight: 700;
    color: rgba(30, 64, 175, 0.1);
    font-family: 'Noto Serif SC', serif;
}

.advantage-item h3 {
    font-size: 22px;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.advantage-item p {
    font-size: 15px;
    color: var(--text-medium);
    line-height: 1.8;
}

/* ===== 客户合作 ===== */
.partners {
    background: var(--bg-light);
}

.partners-intro {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}

.partners-intro p {
    font-size: 17px;
    color: var(--text-medium);
    line-height: 1.8;
}

.partners-intro strong {
    color: var(--primary-color);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.partner-logo {
    background: white;
    border-radius: 16px;
    padding: 40px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.partner-logo::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(30, 64, 175, 0.05), transparent);
    opacity: 0;
    transition: var(--transition);
}

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

.partner-logo:hover::after {
    opacity: 1;
}

.partner-name {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
}

.partner-type {
    font-size: 13px;
    color: var(--text-light);
    position: relative;
    z-index: 1;
}

.partner-logo.more {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.partner-logo.more .partner-name,
.partner-logo.more .partner-type {
    color: white;
}

/* ===== 企业愿景 ===== */
.vision {
    background: var(--bg-white);
}

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

.vision-text blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 24px;
    margin-bottom: 32px;
}

.vision-text blockquote p {
    font-size: 18px;
    color: var(--text-dark);
    line-height: 1.8;
    font-style: italic;
}

.vision-text strong {
    color: var(--primary-color);
}

.vision-text p {
    font-size: 16px;
    color: var(--text-medium);
    margin-bottom: 20px;
    line-height: 1.8;
}

.vision-values {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.value-item {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 28px;
    background: var(--bg-light);
    border-radius: 16px;
    transition: var(--transition);
}

.value-item:hover {
    background: white;
    box-shadow: var(--shadow-md);
    transform: translateX(8px);
}

.value-icon {
    width: 64px;
    height: 64px;
    flex-shrink: 0;
    color: var(--primary-color);
}

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

.value-item h4 {
    font-size: 20px;
    margin-bottom: 4px;
    color: var(--text-dark);
}

.value-item p {
    font-size: 14px;
    color: var(--text-light);
    margin: 0;
}

/* ===== 联系我们 ===== */
.contact {
    background: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-content: start;
}

.info-item {
    background: white;
    border-radius: 16px;
    padding: 28px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.info-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.info-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    color: var(--primary-color);
}

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

.info-item h4 {
    font-size: 16px;
    margin-bottom: 4px;
    color: var(--text-dark);
}

.info-item p {
    font-size: 14px;
    color: var(--text-light);
}

.contact-form {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-md);
}

.contact-form h3 {
    font-size: 24px;
    margin-bottom: 28px;
    color: var(--text-dark);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 20px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-light);
}

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

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

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

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

/* ===== 页脚 ===== */
.footer {
    background: #0f172a;
    color: rgba(255, 255, 255, 0.7);
    padding: 80px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 64px;
}

.footer-brand .logo-mark {
    height: 52px;
}

.footer-brand .logo-zh,
.footer-brand .logo-en {
    color: #fff;
}

.footer-brand .logo-en {
    color: rgba(255, 255, 255, 0.65);
}

.footer-desc {
    margin-top: 24px;
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.6);
}

.footer-links h4 {
    font-size: 16px;
    color: white;
    margin-bottom: 24px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
    padding-left: 4px;
}

.footer-links li {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    margin: 4px 0;
}

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

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

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

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

/* ===== 响应式 ===== */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        gap: 0;
        padding: 24px;
        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-menu li {
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .hamburger {
        display: flex;
    }

    .about-content,
    .vision-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .about-features {
        grid-template-columns: 1fr;
    }

    .hero-stats {
        gap: 32px;
    }

    .stat-divider {
        display: none;
    }

    .performance-timeline::before {
        left: 24px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        flex-direction: row;
        padding-left: 60px;
    }

    .timeline-item::after {
        left: 24px;
    }

    .timeline-content {
        margin: 0;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .section {
        padding: 72px 0;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 20px;
    }

    .nav-container {
        padding: 0 20px;
    }

    .logo-text {
        display: none;
    }

    .hero-title {
        font-size: 32px;
    }

    .stat-number {
        font-size: 36px;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
        max-width: 280px;
        margin: 0 auto;
    }

    .btn {
        width: 100%;
    }

    .contact-form {
        padding: 28px;
    }

    .business-card,
    .advantage-item {
        padding: 28px 24px;
    }
}