/* ============================================
   北京国投创盈投资管理有限公司 - 企业官网
   风格：专业简约 深蓝色系
   ============================================ */

/* CSS 变量定义 */
:root {
    /* 主色调 - 深蓝色系 */
    --color-primary: #1a365d;
    --color-primary-light: #2c5282;
    --color-primary-dark: #1a202c;
    --color-primary-rgb: 26, 54, 93;
    
    /* 辅助色 - 象牙白 */
    --color-ivory: #FFFFF0;
    --color-ivory-light: #FFFEF5;
    --color-white: #FFFFFF;
    
    /* 强调色 */
    --color-accent: #c9a227;
    --color-accent-light: #d4af37;
    
    /* 中性色 */
    --color-gray-50: #F7FAFC;
    --color-gray-100: #EDF2F7;
    --color-gray-200: #E2E8F0;
    --color-gray-300: #CBD5E0;
    --color-gray-400: #A0AEC0;
    --color-gray-500: #718096;
    --color-gray-600: #4A5568;
    --color-gray-700: #2D3748;
    --color-gray-800: #1A202C;
    --color-gray-900: #171923;
    
    /* 状态色 */
    --color-success: #27AE60;
    --color-error: #E74C3C;
    --color-warning: #F39C12;
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 96px;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 字体 */
    --font-family-cn: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-en: 'Playfair Display', Georgia, serif;
}

/* 重置样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family-cn);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

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

button, input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

/* 容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ============================================
   导航栏
   ============================================ */
.header {
    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-base);
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    transition: var(--transition-base);
}

.header.scrolled .header-inner {
    height: 70px;
}

.logo {
    display: flex;
    flex-direction: column;
}

.logo-text {
    font-family: var(--font-family-en);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 2px;
}

.logo-sub {
    font-size: 10px;
    color: var(--color-gray-500);
    letter-spacing: 3px;
    text-transform: uppercase;
}

.nav-list {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    position: relative;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-gray-700);
    padding: var(--spacing-sm) 0;
    transition: var(--transition-base);
}

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

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

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

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 28px;
    height: 20px;
    padding: 0;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition-base);
    transform-origin: left;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg);
}

/* ============================================
   首屏轮播
   ============================================ */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
}

.hero-slider {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-slow);
}

.hero-slide.active {
    opacity: 1;
    visibility: visible;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transform: scale(1.05);
    transition: transform 8s ease-out;
}

.hero-slide.active .hero-bg {
    transform: scale(1);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to right,
        rgba(26, 54, 93, 0.85) 0%,
        rgba(26, 54, 93, 0.6) 50%,
        rgba(26, 54, 93, 0.4) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 10;
    display: flex;
    align-items: center;
    height: 100%;
    padding-top: 80px;
}

.hero-text {
    max-width: 700px;
    color: var(--color-white);
    animation: fadeInUp 0.8s ease forwards;
}

.hero-title {
    font-family: var(--font-family-en);
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    line-height: 1.8;
    margin-bottom: var(--spacing-2xl);
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-xl);
}

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

.stat-number {
    font-family: var(--font-family-en);
    font-size: 40px;
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
}

.stat-number .stat-unit {
    font-size: 18px;
    margin-left: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--color-gray-300);
    margin-top: var(--spacing-sm);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

/* 轮播控制 */
.hero-controls {
    position: absolute;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.hero-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-full);
    color: var(--color-white);
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(5px);
    transition: var(--transition-base);
}

.hero-arrow:hover {
    background: var(--color-white);
    color: var(--color-primary);
    border-color: var(--color-white);
}

.hero-dots {
    display: flex;
    gap: var(--spacing-sm);
}

.hero-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: var(--transition-base);
}

.hero-dot.active {
    width: 30px;
    background: var(--color-white);
}

.hero-dot:hover {
    background: rgba(255, 255, 255, 0.8);
}

/* ============================================
   通用区块
   ============================================ */
.section {
    padding: var(--spacing-4xl) 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: var(--spacing-md);
    position: relative;
}

.section-tag::before,
.section-tag::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 30px;
    height: 1px;
    background: var(--color-accent);
}

.section-tag::before {
    right: calc(100% + 15px);
}

.section-tag::after {
    left: calc(100% + 15px);
}

.section-title {
    font-family: var(--font-family-en);
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

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

/* ============================================
   关于我们
   ============================================ */
.about {
    background: var(--color-ivory-light);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.about-card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: var(--transition-base);
}

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

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

.about-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary);
    background: linear-gradient(135deg, rgba(26, 54, 93, 0.1), rgba(26, 54, 93, 0.05));
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.about-card:hover .about-icon {
    background: var(--color-primary);
    color: var(--color-white);
    transform: scale(1.1);
}

.about-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.about-text {
    font-size: 14px;
    color: var(--color-gray-600);
    line-height: 1.7;
}

/* 关于信息 */
.about-info {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-md);
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.about-info-item {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
    border-left: 2px solid var(--color-gray-200);
}

.about-info-item:first-child {
    border-left: none;
}

.about-info-label {
    font-size: 12px;
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.about-info-value {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-primary);
}

.status-active {
    color: var(--color-success);
}

/* ============================================
   核心业务
   ============================================ */
.business {
    background: var(--color-white);
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.business-card {
    position: relative;
    perspective: 1000px;
}

.business-card-inner {
    position: relative;
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
    overflow: hidden;
}

.business-card-inner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 54, 93, 0.95), rgba(26, 54, 93, 0.85));
    opacity: 0;
    transition: var(--transition-base);
}

.business-card:hover .business-card-inner {
    transform: translateY(-10px);
    box-shadow: var(--shadow-2xl);
}

.business-card:hover .business-card-inner::before {
    opacity: 1;
}

.business-card:hover .business-icon,
.business-card:hover .business-title,
.business-card:hover .business-desc,
.business-card:hover .business-tags {
    color: var(--color-white);
}

.business-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 70px;
    height: 70px;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary);
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
    position: relative;
    z-index: 1;
}

.business-card:hover .business-icon {
    background: rgba(255, 255, 255, 0.2);
}

.business-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    transition: var(--transition-base);
    position: relative;
    z-index: 1;
}

.business-desc {
    font-size: 14px;
    color: var(--color-gray-600);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    transition: var(--transition-base);
    position: relative;
    z-index: 1;
}

.business-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.business-tags li {
    font-size: 12px;
    color: var(--color-primary);
    background: var(--color-gray-50);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.business-card:hover .business-tags li {
    background: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
}

/* 在管基金 */
.business-funds {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    color: var(--color-white);
}

.funds-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.funds-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.fund-item {
    font-size: 14px;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.fund-item:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ============================================
   合作伙伴
   ============================================ */
.partners {
    background: var(--color-gray-50);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.partner-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    cursor: pointer;
    filter: grayscale(100%);
    opacity: 0.6;
}

.partner-item:hover {
    filter: grayscale(0%);
    opacity: 1;
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.partner-logo {
    width: 100%;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.partner-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-700);
    transition: var(--transition-base);
}

.partner-item:hover .partner-name {
    color: var(--color-primary);
}

.partners-legend {
    text-align: center;
    color: var(--color-gray-500);
    font-size: 13px;
}

/* ============================================
   在线咨询
   ============================================ */
.contact {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(201, 162, 39, 0.1) 0%, transparent 70%);
    border-radius: var(--radius-full);
}

.contact .section-tag,
.contact .section-title,
.contact .section-desc,
.contact .contact-desc {
    color: var(--color-white);
}

.contact .section-desc,
.contact .contact-desc {
    opacity: 0.8;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.contact-info {
    color: var(--color-white);
}

.contact-desc {
    font-size: 16px;
    margin-bottom: var(--spacing-2xl);
    opacity: 0.9;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    transition: var(--transition-base);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateX(5px);
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    color: var(--color-white);
}

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

.contact-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.7;
    margin-bottom: var(--spacing-xs);
}

.contact-value {
    font-size: 15px;
    font-weight: 500;
}

/* 表单 */
.contact-form-wrapper {
    position: relative;
}

.contact-form {
    background: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--color-gray-700);
    background: var(--color-gray-50);
    transition: var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.1);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
    border-color: var(--color-error);
}

.form-input.valid,
.form-select.valid,
.form-textarea.valid {
    border-color: var(--color-success);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-error {
    display: block;
    font-size: 12px;
    color: var(--color-error);
    margin-top: var(--spacing-xs);
    min-height: 18px;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

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

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

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

.btn-block {
    width: 100%;
}

.btn .btn-loading {
    display: none;
}

.btn.loading .btn-text {
    display: none;
}

.btn.loading .btn-loading {
    display: inline-flex;
}

/* 表单成功 */
.form-success {
    display: none;
    text-align: center;
    padding: var(--spacing-3xl);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.form-success.show {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.5s ease;
}

.success-icon {
    margin-bottom: var(--spacing-lg);
    animation: scaleIn 0.5s ease;
}

.success-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.success-message {
    font-size: 15px;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xl);
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    padding-top: var(--spacing-3xl);
}

.footer-top {
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
    gap: var(--spacing-2xl);
}

.footer-logo {
    margin-bottom: var(--spacing-lg);
}

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

.footer-logo .logo-sub {
    color: var(--color-gray-500);
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    opacity: 0.8;
}

.footer-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

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

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

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    font-size: 14px;
}

.footer-contact svg {
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--color-accent);
}

/* 社交媒体 */
.footer-social {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.social-label {
    font-size: 14px;
    color: var(--color-gray-400);
}

.social-icons {
    display: flex;
    gap: var(--spacing-md);
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    color: var(--color-gray-300);
    transition: var(--transition-base);
}

.social-icon:hover {
    background: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-3px);
}

/* 底部 */
.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xl) 0;
    font-size: 13px;
}

.footer-copyright {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-copyright p {
    opacity: 0.7;
}

.footer-legal {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-legal a {
    color: var(--color-gray-400);
    transition: var(--transition-base);
}

.footer-legal a:hover {
    color: var(--color-accent);
}

.footer-legal .divider {
    opacity: 0.3;
}

/* ============================================
   返回顶部
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    z-index: 999;
}

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

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

/* ============================================
   动画
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 滚动动画 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   响应式设计
   ============================================ */

/* 平板 */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-info {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .business-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 大手机 */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--color-white);
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .section {
        padding: var(--spacing-3xl) 0;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .about-info {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .business-grid {
        grid-template-columns: 1fr;
    }
    
    .funds-list {
        grid-template-columns: 1fr;
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

/* 小手机 */
@media (max-width: 480px) {
    .header-inner {
        height: 70px;
    }
    
    .logo-text {
        font-size: 20px;
    }
    
    .hero {
        min-height: 500px;
    }
    
    .hero-title {
        font-size: 26px;
    }
    
    .hero-subtitle {
        font-size: 15px;
    }
    
    .stat-number {
        font-size: 32px;
    }
    
    .about-info {
        grid-template-columns: 1fr;
    }
    
    .about-info-item {
        border-left: none;
        border-bottom: 1px solid var(--color-gray-200);
        padding-bottom: var(--spacing-md);
    }
    
    .about-info-item:last-child {
        border-bottom: none;
    }
    
    .partners-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-controls {
        bottom: var(--spacing-lg);
    }
    
    .hero-arrow {
        width: 40px;
        height: 40px;
    }
}