/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1B3160;  /* 深蓝色 */
    --secondary-color: #C1272D; /* 红色 */
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-text: #fff;
    --background-color: #f8f9fa;
    --section-padding: 80px 0;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

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

/* Header Styles */
.header {
    background-color: var(--primary-color);
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo a {
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo-text {
    color: var(--light-text);
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 1px;  /* 增加字间距 */
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);  /* 添加文字阴影 */
    transition: color 0.3s ease;
}

.logo-text:hover {
    color: var(--secondary-color);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: var(--light-text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--secondary-color);
}

.lang-switch {
    background: transparent;
    border: 1px solid var(--light-text);
    color: var(--light-text);
    padding: 5px 15px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
}

.lang-switch:hover {
    background: var(--light-text);
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    color: var(--light-text);
    font-size: 24px;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--light-text);
    padding-top: 80px;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: 40px;
}

.cta-button {
    display: inline-block;
    padding: 15px 30px;
    background-color: var(--secondary-color);
    color: var(--light-text);
    text-decoration: none;
    border-radius: 30px;
    font-weight: 500;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: #2980b9;
}

/* About Section */
.about {
    padding: var(--section-padding);
    background-color: var(--light-text);
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: var(--primary-color);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-text p {
    font-size: 18px;
    margin-bottom: 20px;
}

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

.stat-item {
    text-align: center;
    padding: 20px;
    background-color: var(--background-color);
    border-radius: 10px;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

/* Services Section */
.services {
    padding: var(--section-padding);
    background-color: var(--background-color);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background-color: var(--light-text);
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.service-card:hover {
    transform: translateY(-10px);
}

.service-card i {
    font-size: 48px;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

/* Solutions Section */
.solutions {
    padding: var(--section-padding);
    background-color: var(--light-text);
}

.solutions-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.solution-item {
    padding: 30px;
    background-color: var(--background-color);
    border-radius: 10px;
}

.solution-item:hover {
    background: rgba(255, 255, 255, 0.9);
}

.solution-item h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

/* Contact Section */
.contact {
    padding: var(--section-padding);
    background-color: var(--background-color);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 15px;
}

.info-item i {
    font-size: 24px;
    color: var(--secondary-color);
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-form input,
.contact-form textarea {
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

.contact-form textarea {
    height: 150px;
    resize: vertical;
}

.submit-button {
    padding: 15px 30px;
    background-color: var(--secondary-color);
    color: var(--light-text);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

.submit-button:hover {
    background-color: #2980b9;
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

.footer-logo a {
    color: var(--light-text);
    font-size: 24px;
    font-weight: 700;
    text-decoration: none;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
}

.footer-links a {
    color: var(--light-text);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-social {
    display: flex;
    justify-content: flex-end;
    gap: 20px;
}

.footer-social a {
    color: var(--light-text);
    font-size: 24px;
    transition: color 0.3s;
}

.footer-social a:hover {
    color: var(--secondary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

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

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

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

    .footer-social {
        justify-content: center;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 20px;
    }

    .logo-text {
        font-size: 24px;  /* 移动端稍微小一点 */
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr;
    }

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

/* Clients Section */
.clients-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    align-items: center;
    justify-items: center;
}

.client-logo {
    width: 100%;
    max-width: 200px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background-color: var(--light-text);
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.client-logo:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.client-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: grayscale(100%);
    transition: filter 0.3s;
}

.client-logo:hover img {
    filter: grayscale(0%);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .clients-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .clients-grid {
        grid-template-columns: 1fr;
    }
}