/* Global Styles */
:root {
    --primary-color: #003366; /* Deep Blue */
    --secondary-color: #C5A059; /* Gold Accent */
    --text-color: #333;
    --light-bg: #f9f9f9;
    --white: #ffffff;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

section {
    padding: 80px 0;
}

h1, h2, h3 {
    margin-bottom: 20px;
}

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

ul {
    list-style: none;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background-color: #004488;
    transform: translateY(-2px);
}

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

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

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 10px;
}

.underline {
    width: 60px;
    height: 3px;
    background-color: var(--secondary-color);
    margin: 0 auto;
}

/* Navbar */
.navbar {
    height: 80px;
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

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

.nav-links a.active {
    color: var(--secondary-color);
    border-bottom: 2px solid var(--secondary-color);
}

/* Page Banner (for subpages) */
.page-banner {
    height: 300px;
    background: linear-gradient(rgba(0, 51, 102, 0.8), rgba(0, 51, 102, 0.8)), url('images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    padding-top: 80px;
    text-align: center;
}

.page-banner h1 {
    font-size: 3rem;
    margin-bottom: 0;
}

/* Advantages Section */
.advantages {
    background-color: var(--white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.advantage-item {
    text-align: center;
    padding: 20px;
}
.form-group {
    width: 100%;
}
.form-group input, .form-group textarea {
    width: 100%;
}
.icon-box {
    width: 80px;
    height: 80px;
    background: var(--light-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--primary-color);
    font-size: 2rem;
    transition: var(--transition);
}

.advantage-item:hover .icon-box {
    background: var(--primary-color);
    color: var(--white);
    transform: rotateY(360deg);
}

/* Footer Content */
.footer-info p {
    margin-bottom: 10px;
    font-size: 0.9rem;
    opacity: 0.8;
}

.logo-en {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.logo-cn {
    font-size: 0.9rem;
    color: var(--secondary-color);
    letter-spacing: 3px;
    font-weight: 600;
}

.nav-links {
    display: flex;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    font-weight: 500;
    color: var(--primary-color);
    transition: var(--transition);
}

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

.burger {
    display: none;
    cursor: pointer;
}

.burger div {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 5px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0, 51, 102, 0.7), rgba(0, 51, 102, 0.7)), url('images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    color: var(--white);
    padding-top: 80px;
}

.hero-content {
    max-width: 700px;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

.hero-btns a {
    margin-right: 15px;
}

/* Business Scope */
.business-scope {
    background-color: var(--light-bg);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--white);
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: var(--transition);
}

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

.service-card i {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

/* About Us */
.about-wrapper {
    display: flex;
    align-items: center;
    gap: 50px;
}

.about-text {
    flex: 1;
}

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

.about-image {
    flex: 1;
}

.about-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 20px 20px 0 var(--secondary-color);
}

/* Portfolio */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 20px;
}

.portfolio-item {
    position: relative;
    overflow: hidden;
    border-radius: 10px;
    height: 300px;
}

.portfolio-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 51, 102, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--white);
    opacity: 0;
    transition: var(--transition);
    padding: 20px;
    text-align: center;
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-item:hover img {
    transform: scale(1.1);
}

/* News Section */
.news {
    background-color: var(--light-bg);
}

.news-list {
    max-width: 800px;
    margin: 0 auto;
}

.news-item {
    display: flex;
    background: var(--white);
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.news-item .date {
    min-width: 80px;
    text-align: center;
    border-right: 2px solid var(--secondary-color);
    margin-right: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.news-item .date span {
    font-size: 0.9rem;
    font-weight: 400;
}

.news-item .news-content h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.news-item .news-content p {
    margin-bottom: 15px;
    color: #666;
}

.read-more {
    color: var(--secondary-color);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    transition: var(--transition);
}

.read-more:hover {
    color: var(--primary-color);
}

.read-more i {
    margin-left: 5px;
    transition: transform 0.3s ease;
}

.read-more:hover i {
    transform: translateX(5px);
}

.detail-content {
    max-width: 800px;
    margin: 0 auto;
    background: var(--white);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.detail-date {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.detail-content h1 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 30px;
    line-height: 1.4;
}

.detail-body {
    margin-bottom: 30px;
}

.detail-body p {
    margin-bottom: 20px;
    line-height: 1.8;
    color: #555;
}

.back-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    font-weight: 500;
    padding: 10px 20px;
    border: 2px solid var(--primary-color);
    border-radius: 5px;
    transition: var(--transition);
}

.back-link:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

.back-link i {
    margin-right: 8px;
}

/* FAQ */
.accordion {
    max-width: 800px;
    margin: 0 auto;
}

.accordion-item {
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.accordion-header {
    padding: 20px;
    background: var(--white);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    transition: var(--transition);
}

.accordion-header:hover {
    background: #f0f0f0;
}

.accordion-body {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: var(--white);
}

.accordion-item.active .accordion-body {
    max-height: 200px;
    padding: 20px;
}

.accordion-item.active .accordion-header i {
    transform: rotate(180deg);
}

/* Contact */
.contact-wrapper {
    display: flex;
    gap: 50px;
}

.contact-info {
    flex: 1;
}

.info-item {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-right: 20px;
    width: 30px;
}

.contact-form {
    flex: 1;
}

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

.contact-form input, 
.contact-form textarea {
    padding: 15px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 30px 0;
    text-align: center;
}

/* Responsive */
@media screen and (max-width: 1024px) {
    .hero h1 {
        font-size: 2.5rem;
    }
}

@media screen and (max-width: 768px) {
    .nav-links {
        position: absolute;
        right: 0px;
        height: 92vh;
        top: 80px;
        background-color: var(--white);
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100%;
        transform: translateX(100%);
        transition: transform 0.5s ease-in;
        box-shadow: 0 10px 10px rgba(0,0,0,0.1);
    }

    .nav-links li {
        margin: 20px 0;
    }

    .burger {
        display: block;
    }

    .nav-active {
        transform: translateX(0%);
    }

    .about-wrapper, .contact-wrapper {
        flex-direction: column;
    }

    .about-image {
        order: -1;
        margin-bottom: 30px;
    }

    .about-image img {
        box-shadow: 10px 10px 0 var(--secondary-color);
    }

    .hero {
        text-align: center;
    }

    .hero-btns {
        display: flex;
        flex-direction: column;
        gap: 15px;
    }

    .hero-btns a {
        margin-right: 0;
    }

    .section-title h2 {
        font-size: 2rem;
    }
}

/* Burger Animation */
.toggle .line1 {
    transform: rotate(-45deg) translate(-5px, 6px);
}
.toggle .line2 {
    opacity: 0;
}
.toggle .line3 {
    transform: rotate(45deg) translate(-5px, -6px);
}