:root {
    --primary-color: #004d40; /* Dark Green */
    --primary-light: #00796b;
    --primary-dark: #00251a;
    --accent-color: #ffc107; /* Gold/Amber for contrast */
    --text-color: #333;
    --bg-color: #f4f7f6;
    --white: #ffffff;
    --gray: #666;
    --light-gray: #e0e0e0;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow-x: hidden;
}

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

/* Header & Navigation */
header {
    background-color: var(--primary-dark);
    color: var(--white);
    padding: 15px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--accent-color);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 25px;
}

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

.nav-links a:hover, .nav-links a.active {
    color: var(--accent-color);
}

.mobile-menu-btn {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* Hero Section */
.hero {
    height: 80vh;
    background: linear-gradient(rgba(0, 77, 64, 0.7), rgba(0, 77, 64, 0.7)), url('https://tse-mm.bing.com/th?q=体育场馆') center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    margin-top: 60px;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.hero-content p {
    font-size: 20px;
    max-width: 800px;
    margin: 0 auto 30px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--accent-color);
    color: var(--primary-dark);
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: var(--transition);
}

.btn:hover {
    background-color: var(--white);
    color: var(--primary-dark);
    transform: translateY(-3px);
}

/* Sections */
section {
    padding: 80px 0;
}

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

.section-title h2 {
    font-size: 36px;
    color: var(--primary-dark);
    position: relative;
    padding-bottom: 15px;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--accent-color);
}

/* Home: Company Intro */
.intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.intro-text h3 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.intro-stats {
    display: flex;
    gap: 30px;
    margin-top: 30px;
}

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

.stat-item span {
    display: block;
    font-size: 32px;
    font-weight: bold;
    color: var(--primary-light);
}

.stat-item p {
    font-size: 14px;
    color: var(--gray);
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.card {
    background-color: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.card-img {
    height: 200px;
    overflow: hidden;
}

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

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

.card-content {
    padding: 20px;
}

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

/* News Section */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.news-item {
    background-color: var(--white);
    padding: 20px;
    border-radius: 8px;
    display: flex;
    gap: 20px;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.news-item:hover {
    background-color: #f0f4f3;
}

.news-date {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 10px;
    border-radius: 5px;
    text-align: center;
    min-width: 80px;
}

.news-date span {
    display: block;
    font-size: 20px;
    font-weight: bold;
}

/* Dynamics List */
.dynamics-container {
    background-color: var(--white);
    padding: 20px;
    border-radius: 10px;
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--light-gray);
}

.dynamic-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--light-gray);
    display: flex;
    justify-content: space-between;
}

.dynamic-item:last-child {
    border-bottom: none;
}

.dynamic-time {
    color: var(--gray);
    font-size: 13px;
}

/* Product Page Filters */
.filter-section {
    background-color: var(--white);
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.filter-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

.filter-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--primary-dark);
}

.filter-group select, .filter-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--light-gray);
    border-radius: 5px;
    outline: none;
}

.tag-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    padding: 5px 15px;
    background-color: #f0f0f0;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

.tag.active, .tag:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
}

.page-btn {
    padding: 8px 15px;
    border: 1px solid var(--primary-color);
    background-color: var(--white);
    color: var(--primary-color);
    cursor: pointer;
    border-radius: 3px;
    transition: var(--transition);
}

.page-btn.active, .page-btn:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

/* About Us: Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 4px;
    background-color: var(--primary-color);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: var(--white);
    border: 4px solid var(--accent-color);
    top: 15px;
    border-radius: 50%;
    z-index: 1;
}

.left {
    left: 0;
}

.right {
    left: 50%;
}

.right::after {
    left: -10px;
}

.timeline-content {
    padding: 20px;
    background-color: var(--white);
    position: relative;
    border-radius: 6px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* Contact Us */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-form {
    background-color: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--light-gray);
    border-radius: 5px;
}

.contact-info h3 {
    margin-bottom: 20px;
    color: var(--primary-dark);
}

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

.map-container {
    height: 300px;
    background-color: #ddd;
    border-radius: 10px;
    margin-top: 30px;
    overflow: hidden;
}

.map-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    margin-bottom: 20px;
    color: var(--accent-color);
}

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

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid #333;
    padding-top: 20px;
    font-size: 14px;
    color: #999;
}

/* Floating Elements */
.online-chat {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--accent-color);
    color: var(--primary-dark);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    z-index: 999;
    transition: var(--transition);
}

.online-chat:hover {
    transform: scale(1.1);
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background-color: var(--primary-dark);
        flex-direction: column;
        padding: 20px;
    }

    .nav-links.show {
        display: flex;
    }

    .nav-links li {
        margin: 10px 0;
    }

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

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

    .timeline::after {
        left: 31px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }

    .timeline-item::after {
        left: 21px;
    }

    .right {
        left: 0;
    }
}