/* 基础样式重置与变量 */
:root {
    --primary-blue: #1a3a8f;
    --secondary-blue: #4dabf7;
    --accent-gold: #f4b400;
    --light-bg: #f8f9fa;
    --dark-text: #2c3e50;
    --light-text: #7f8c8d;
    --gradient-primary: linear-gradient(135deg, #1a3a8f 0%, #2c5aa0 100%);
    --gradient-accent: linear-gradient(135deg, #4dabf7 0%, #1a3a8f 100%);
    --transition-smooth: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
    --shadow-light: 0 5px 15px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 20px 50px rgba(0, 0, 0, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--dark-text);
    line-height: 1.8; /* 增加行高，减少拥挤感 */
    letter-spacing: 0.3px; /* 添加字母间距 */
    background-color: var(--light-bg);
    overflow-x: hidden;
    position: relative;
}

/* 段落间距优化 */
p {
    margin-bottom: 1.2em;
    line-height: 1.8;
}

/* 创意背景元素 */
.background-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(77, 171, 247, 0.1) 0%, rgba(77, 171, 247, 0) 70%);
    animation: float 20s infinite ease-in-out;
}

.floating-shape:nth-child(1) {
    width: 300px;
    height: 300px;
    top: 10%;
    left: 5%;
    animation-delay: 0s;
}

.floating-shape:nth-child(2) {
    width: 200px;
    height: 200px;
    top: 60%;
    right: 10%;
    animation-delay: 5s;
}

.floating-shape:nth-child(3) {
    width: 150px;
    height: 150px;
    bottom: 20%;
    left: 15%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(5deg); }
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 现代导航栏 - 手机端优化 */
header {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 15px 0;
    transition: var(--transition-smooth);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

header.scrolled {
    padding: 10px 0;
    box-shadow: var(--shadow-medium);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap; /* 允许换行 */
}

.logo {
    display: flex;
    align-items: center;
    position: relative;
    margin-right: 15px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    color: white;
    font-size: 20px;
    transform-style: preserve-3d;
    transition: var(--transition-smooth);
}

.logo:hover .logo-icon {
    transform: rotateY(180deg) scale(1.1);
}

.logo-text h1 {
    font-size: 22px; /* 减小字体，适应手机端 */
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 2px;
    line-height: 1.2;
}

.logo-text p {
    font-size: 11px; /* 减小字体，适应手机端 */
    color: var(--light-text);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    line-height: 1.2;
    margin-bottom: 0;
}

.logo-global {
    position: absolute;
    top: -5px;
    right: -30px;
    color: var(--accent-gold);
    font-size: 10px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.7; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.1); }
}

/* 导航区域 - 手机端优化 */
.nav-container {
    display: flex;
    align-items: center;
    flex-wrap: wrap; /* 允许换行 */
    justify-content: flex-end;
    flex: 1;
}

nav ul {
    display: flex;
    list-style: none;
    margin-right: 15px; /* 增加右边距 */
}

nav ul li {
    margin-left: 20px; /* 减小间距 */
}

nav ul li a {
    color: var(--dark-text);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px; /* 减小字体，适应手机端 */
    transition: var(--transition-smooth);
    position: relative;
    padding: 5px 0;
    white-space: nowrap; /* 防止文字换行 */
}

nav ul li a::before {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    bottom: 0;
    left: 0;
    transition: width 0.3s ease;
}

nav ul li a:hover {
    color: var(--primary-blue);
}

nav ul li a:hover::before {
    width: 100%;
}

/* 语言切换按钮优化 - 修复白色背景问题 */
.lang-switch {
    display: flex;
    border-radius: 25px;
    overflow: hidden;
    background: var(--light-bg);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.lang-btn {
    padding: 8px 18px; /* 减小内边距 */
    background: transparent;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 13px; /* 减小字体 */
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    color: var(--dark-text);
}

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

.lang-btn:not(.active):hover {
    background: rgba(77, 171, 247, 0.1);
}

.mobile-menu-btn {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--primary-blue);
    margin-left: 15px;
}

/* 英雄区域 - 手机端优化 */
.hero {
    padding: 160px 0 80px; /* 减小内边距 */
    background: var(--gradient-primary);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('../images/2.png');
    background-size: cover;
    background-position: center;
    opacity: 0.15;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.hero-tagline {
    font-size: 16px; /* 减小字体 */
    text-transform: uppercase;
    letter-spacing: 2px; /* 减小字间距 */
    margin-bottom: 20px;
    color: rgba(255, 255, 255, 0.9);
    display: inline-block;
    padding: 8px 16px; /* 减小内边距 */
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 30px;
    backdrop-filter: blur(5px);
}

.hero h1 {
    font-size: 36px; /* 减小字体，适应手机端 */
    margin-bottom: 25px;
    font-weight: 800;
    line-height: 1.3; /* 调整行高 */
    letter-spacing: 0.5px; /* 添加字母间距 */
}

.hero p {
    font-size: 18px; /* 减小字体 */
    margin-bottom: 35px;
    opacity: 0.9;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
    letter-spacing: 0.2px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 15px; /* 减小间距 */
    margin-top: 35px;
    flex-wrap: wrap; /* 允许按钮换行 */
}

.btn {
    padding: 14px 28px; /* 减小内边距 */
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: -100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.7s;
}

.btn:hover::after {
    left: 100%;
}

.btn-primary {
    background: white;
    color: var(--primary-blue);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    transform: translateY(-5px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 30px; /* 减小间距 */
    margin-top: 60px;
    flex-wrap: wrap; /* 允许换行 */
}

.stat-item {
    text-align: center;
    min-width: 120px; /* 设置最小宽度 */
}

.stat-number {
    font-size: 36px; /* 减小字体 */
    font-weight: 800;
    color: var(--accent-gold);
    margin-bottom: 5px;
    position: relative;
    display: inline-block;
    padding-right: 20px; /* 为加号留出空间 */
}

/* 修复加号与文字重叠问题 */
.stat-number::after {
    content: '+';
    position: absolute;
    top: 0;
    right: 0;
    font-size: 24px;
}

.stat-text {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    opacity: 0.8;
}

/* 公司简介 - 手机端优化 */
section {
    padding: 80px 0; /* 减小内边距 */
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
}

.section-title h2 {
    font-size: 32px; /* 减小字体 */
    color: var(--primary-blue);
    margin-bottom: 15px;
    font-weight: 800;
    position: relative;
    display: inline-block;
    line-height: 1.3;
    letter-spacing: 0.5px;
}

.section-title h2::after {
    content: '';
    position: absolute;
    width: 70px;
    height: 4px;
    background: var(--gradient-accent);
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--light-text);
    max-width: 700px;
    margin: 25px auto 0;
    line-height: 1.8;
    letter-spacing: 0.2px;
}

.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px; /* 减小间距 */
}

.about-card {
    background: white;
    padding: 30px; /* 减小内边距 */
    border-radius: 15px;
    box-shadow: var(--shadow-light);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.about-card::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 5px;
    background: var(--gradient-accent);
    top: 0;
    left: 0;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
    z-index: 2;
}

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

.about-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.about-icon {
    width: 60px; /* 减小尺寸 */
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    color: white;
    font-size: 24px;
    transition: var(--transition-smooth);
}

.about-card:hover .about-icon {
    transform: rotateY(180deg) scale(1.1);
}

.about-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--dark-text);
    font-weight: 700;
    line-height: 1.3;
}

.milestone-list li {
    padding: 10px 0;
    border-bottom: 1px dashed #eee;
    display: flex;
    align-items: center;
    flex-wrap: wrap; /* 允许换行 */
}

.milestone-list li:last-child {
    border-bottom: none;
}

.milestone-year {
    background: var(--light-bg);
    color: var(--primary-blue);
    padding: 5px 12px;
    border-radius: 20px;
    font-weight: 700;
    margin-right: 10px;
    margin-bottom: 5px;
    font-size: 20px;
}

/* 服务区域 - 手机端优化 */
.services {
    background: var(--light-bg);
    position: relative;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); /* 调整最小宽度 */
    gap: 25px; /* 减小间距 */
}

.service-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition-smooth);
    height: 100%;
    position: relative;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.service-card::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1;
}

.service-card:hover::after {
    opacity: 0.02;
}

.service-header {
    display: flex;
    align-items: center;
    padding: 25px 25px 0;
}

.service-icon-wrapper {
    width: 60px; /* 减小尺寸 */
    height: 60px;
    border-radius: 12px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    color: white;
    font-size: 24px;
    transition: var(--transition-smooth);
}

.service-card:hover .service-icon-wrapper {
    transform: rotate(15deg) scale(1.1);
}

.service-number {
    font-size: 32px; /* 减小字体 */
    font-weight: 800;
    color: rgba(26, 58, 143, 0.1);
    margin-left: auto;
}

.service-content {
    padding: 25px;
    position: relative;
    z-index: 2;
}

.service-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--dark-text);
    font-weight: 700;
    line-height: 1.3;
}

.service-content p {
    color: var(--light-text);
    margin-bottom: 18px;
    min-height: 70px;
    line-height: 1.7;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}

.service-tag {
    background: rgba(77, 171, 247, 0.1);
    color: var(--primary-blue);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition-smooth);
}

.service-tag:hover {
    background: var(--primary-blue);
    color: white;
    transform: translateY(-3px);
}

/* 全球化特色区域 - 手机端优化 */
.global-features {
    background: white;
    position: relative;
}

.features-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); /* 调整最小宽度 */
    gap: 25px;
}

.feature-card {
    text-align: center;
    padding: 30px 20px;
    border-radius: 15px;
    background: var(--light-bg);
    transition: var(--transition-smooth);
}

.feature-card:hover {
    background: white;
    box-shadow: var(--shadow-medium);
    transform: translateY(-8px);
}

.feature-icon {
    width: 70px; /* 减小尺寸 */
    height: 70px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 28px;
    transition: var(--transition-smooth);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(10deg);
}

.feature-card h4 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--dark-text);
    line-height: 1.3;
}

/* 联系我们 - 手机端优化 */
.contact {
    background: var(--gradient-primary);
    color: white;
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('../images/1.png');
    background-size: cover;
    background-position: center;
    opacity: 0.1;
}

.contact .section-title h2 {
    color: white;
}

.contact .section-subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); /* 调整最小宽度 */
    gap: 30px;
    margin-top: 40px;
}

.contact-method {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    transition: var(--transition-smooth);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.contact-method:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-8px);
}

.contact-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 28px;
}

.contact-method h3 {
    font-size: 22px;
    margin-bottom: 12px;
    line-height: 1.3;
}

.contact-method p {
    margin-bottom: 15px;
    opacity: 0.9;
    line-height: 1.7;
}

.contact-number {
    font-size: 24px; /* 减小字体 */
    font-weight: 800;
    color: var(--accent-gold);
    margin-top: 8px;
}

.qr-placeholder {
    width: 130px;
    height: 130px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    margin: 15px auto;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 13px;
}

/* 页脚 - 手机端优化 */
footer {
    background: #1a1a2e;
    color: white;
    padding: 60px 0 25px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 18px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 12px;
    line-height: 1.3;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    width: 35px;
    height: 3px;
    background: var(--secondary-blue);
    bottom: 0;
    left: 0;
}

.footer-section p {
    opacity: 0.8;
    margin-bottom: 15px;
    line-height: 1.8;
    font-size: 14px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    font-size: 14px;
}

.footer-section ul li i {
    margin-right: 10px;
    color: var(--secondary-blue);
    width: 18px;
}

.social-icons {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.social-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.social-icon:hover {
    background: var(--secondary-blue);
    transform: translateY(-5px);
}

.copyright {
    text-align: center;
    padding-top: 25px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
    font-size: 13px;
    line-height: 1.6;
}

/* 响应式设计 - 重点优化手机端 */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 32px;
    }

    .services-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }

    .lang-btn {
        padding: 7px 15px;
        font-size: 12px;
    }
}

@media (max-width: 768px) {
    /* 手机端导航优化 */
    .header-content {
        justify-content: space-between;
    }

    .logo {
        margin-right: 0;
        width: 78%;
    }

    .logo-text h1 {
        font-size: 20px;
    }

    .logo-text p {
        font-size: 10px;
        letter-spacing: 1px;
    }

    .nav-container {
        order: 3;
        width: 100%;
        margin-top: 15px;
        justify-content: space-between;
        display: none; /* 默认隐藏，点击按钮显示 */
    }

    .nav-container.active {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
    }

    nav ul {
        flex-direction: column;
        width: 100%;
        margin-right: 0;
        margin-bottom: 15px;
    }

    nav ul li {
        margin-left: 0;
        margin-bottom: 10px;
        width: 100%;
    }

    nav ul li a {
        display: block;
        padding: 10px 0;
        font-size: 16px;
    }

    .lang-switch {
        align-self: center;
        margin-top: 10px;
    }

    .mobile-menu-btn {
        display: block;
    }

    /* 英雄区域优化 */
    .hero {
        padding: 140px 0 60px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero p {
        font-size: 16px;
        padding: 0 10px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        margin-bottom: 10px;
    }

    .hero-stats {
        gap: 20px;
    }

    .stat-item {
        min-width: 100px;
    }

    .stat-number {
        font-size: 30px;
    }

    /* 内容区域优化 */
    section {
        padding: 60px 0;
    }

    .section-title {
        margin-bottom: 40px;
    }

    .section-title h2 {
        font-size: 28px;
    }

    .section-subtitle {
        font-size: 15px;
        padding: 0 10px;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

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

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

    /* 调整字体和间距 */
    body {
        font-size: 15px;
        line-height: 1.7;
    }

    h1, h2, h3, h4 {
        letter-spacing: 0.3px;
    }

    p {
        line-height: 1.7;
        margin-bottom: 1em;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }

    .hero h1 {
        font-size: 26px;
    }

    .hero-tagline {
        font-size: 14px;
        letter-spacing: 1.5px;
        padding: 6px 12px;
    }

    .hero-stats {
        gap: 15px;
    }

    .stat-item {
        min-width: 80px;
    }

    .stat-number {
        font-size: 26px;
    }

    .stat-text {
        font-size: 11px;
        letter-spacing: 1px;
    }

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

    .service-content p {
        min-height: auto;
    }

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

/* 超小屏幕优化 */
@media (max-width: 400px) {
    .logo-text h1 {
        font-size: 18px;
    }

    .logo-icon {
        width: 35px;
        height: 35px;
        font-size: 18px;
        margin-right: 10px;
    }

    .hero h1 {
        font-size: 24px;
    }

    .hero p {
        font-size: 15px;
    }

    .btn {
        padding: 12px 20px;
        font-size: 14px;
    }
}

/* 语言切换效果 */
.lang-en {
    display: none;
}

body.show-en .lang-zh {
    display: none;
}

body.show-en .lang-en {
    display: block;
}

.lang-zh {
    display: block;
}

/* 滚动动画类 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* 粒子背景效果 */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    pointer-events: none;
}