/* ============================================
   恒泰体育 - 主样式表
   体育场地工程施工与材料供应商
   ============================================ */

/* CSS Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #F9A825;
    --primary-dark: #F57F17;
    --dark: #37474F;
    --dark-light: #455A64;
    --light: #ECEFF1;
    --white: #FFFFFF;
    --text: #263238;
    --text-light: #546E7A;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --radius: 8px;
    --transition: all 0.3s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

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

a {
    color: var(--primary-dark);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary);
}

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

/* ============================================
   Header & Navigation
   ============================================ */
.site-header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    background: var(--dark);
    color: var(--light);
    font-size: 0.85rem;
    padding: 6px 0;
}

.header-top .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-top a {
    color: var(--primary);
}

.header-main {
    padding: 12px 0;
}

.header-main .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--dark);
    font-size: 1.2rem;
}

.logo-text h1 {
    font-size: 1.4rem;
    color: var(--dark);
    font-weight: 700;
}

.logo-text p {
    font-size: 0.75rem;
    color: var(--text-light);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 4px;
}

.main-nav a {
    display: block;
    padding: 10px 16px;
    color: var(--dark);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius);
    transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
    background: var(--primary);
    color: var(--dark);
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--dark);
    padding: 8px;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    height: 600px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(55,71,79,0.85) 0%, rgba(55,71,79,0.5) 100%);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    color: var(--white);
    padding: 0 20px;
}

.hero-content h2 {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 16px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-content h2 span {
    color: var(--primary);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 32px;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(249,168,37,0.4);
}

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

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

/* ============================================
   Section Styles
   ============================================ */
.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--light);
}

.section-dark {
    background: var(--dark);
    color: var(--white);
}

.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 12px;
}

.section-dark .section-title h2 {
    color: var(--white);
}

.section-title p {
    font-size: 1.05rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--primary);
    margin: 16px auto 0;
    border-radius: 2px;
}

/* ============================================
   Product Cards
   ============================================ */
.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.product-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.product-card-body {
    padding: 20px;
}

.product-card-body h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--dark);
}

.product-card-body p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 12px;
}

/* ============================================
   Stats Counter
   ============================================ */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-item {
    padding: 24px;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 1rem;
    color: var(--light);
    opacity: 0.9;
}

/* ============================================
   Case Grid
   ============================================ */
.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.case-card img {
    width: 100%;
    height: 240px;
    object-fit: cover;
}

.case-card-info {
    padding: 16px 20px;
    background: var(--white);
}

.case-card-info h3 {
    font-size: 1rem;
    color: var(--dark);
    margin-bottom: 4px;
}

.case-card-info span {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* ============================================
   Process Steps
   ============================================ */
.process-steps {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 12px;
    text-align: center;
}

.step-item {
    padding: 20px 8px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    position: relative;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: var(--dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin: 0 auto 12px;
}

.step-item h4 {
    font-size: 0.85rem;
    color: var(--dark);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-light) 100%);
    padding: 60px 0;
    text-align: center;
    color: var(--white);
}

.cta-section h2 {
    font-size: 2rem;
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 1.1rem;
    margin-bottom: 24px;
    opacity: 0.9;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: #1a2a32;
    color: var(--light);
    padding: 60px 0 0;
}

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

.footer-col h3 {
    font-size: 1.1rem;
    color: var(--white);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}

.footer-col p {
    font-size: 0.9rem;
    line-height: 1.8;
    color: #b0bec5;
}

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

.footer-col ul li {
    margin-bottom: 8px;
}

.footer-col ul li a {
    color: #b0bec5;
    font-size: 0.9rem;
}

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

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 12px;
    font-size: 0.9rem;
    color: #b0bec5;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 20px 0;
    text-align: center;
    font-size: 0.85rem;
    color: #78909c;
}

/* ============================================
   Breadcrumb
   ============================================ */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.9rem;
    color: var(--text-light);
}

.breadcrumb a {
    color: var(--text-light);
}

.breadcrumb a:hover {
    color: var(--primary);
}

.breadcrumb span {
    margin: 0 8px;
}

/* ============================================
   Page Banner
   ============================================ */
.page-banner {
    height: 300px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.page-banner img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.page-banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(55,71,79,0.75);
}

.page-banner-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
}

.page-banner-content h2 {
    font-size: 2.2rem;
    margin-bottom: 8px;
}

.page-banner-content p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* ============================================
   Content Pages
   ============================================ */
.content-section {
    padding: 60px 0;
}

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

.content-main h2 {
    font-size: 1.6rem;
    color: var(--dark);
    margin-bottom: 16px;
}

.content-main h3 {
    font-size: 1.3rem;
    color: var(--dark);
    margin: 24px 0 12px;
}

.content-main p {
    margin-bottom: 16px;
    line-height: 1.8;
    color: var(--text);
}

.sidebar {
    background: var(--light);
    border-radius: var(--radius);
    padding: 24px;
}

.sidebar h3 {
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary);
}

.sidebar ul {
    list-style: none;
}

.sidebar ul li {
    padding: 10px 0;
    border-bottom: 1px solid #ddd;
}

.sidebar ul li a {
    color: var(--text);
    font-size: 0.95rem;
}

.sidebar ul li a:hover {
    color: var(--primary);
}

/* ============================================
   Form Styles
   ============================================ */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--dark);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #cfd8dc;
    border-radius: var(--radius);
    font-size: 0.95rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(249,168,37,0.15);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* ============================================
   Honor / Certificate Grid
   ============================================ */
.honor-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.honor-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    text-align: center;
    padding: 24px;
}

.honor-card img {
    max-height: 200px;
    margin: 0 auto 16px;
    object-fit: contain;
}

.honor-card h3 {
    font-size: 1rem;
    color: var(--dark);
}

/* ============================================
   News List
   ============================================ */
.news-list {
    display: grid;
    gap: 24px;
}

.news-item {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 24px;
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.news-item:hover {
    box-shadow: var(--shadow-lg);
}

.news-item img {
    width: 100%;
    height: 160px;
    object-fit: cover;
}

.news-item-body {
    padding: 20px 20px 20px 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-item-body h3 {
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 8px;
}

.news-item-body p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 8px;
}

.news-date {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* ============================================
   Solution Cards
   ============================================ */
.solution-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.solution-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.solution-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.solution-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.solution-card-body {
    padding: 24px;
}

.solution-card-body h3 {
    font-size: 1.2rem;
    color: var(--dark);
    margin-bottom: 12px;
}

.solution-card-body p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.7;
}

/* ============================================
   Contact Info
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info-card {
    background: var(--light);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

/* ============================================
   Video Section
   ============================================ */
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin: 24px 0;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* ============================================
   Timeline
   ============================================ */
.timeline {
    position: relative;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--primary);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    margin-bottom: 40px;
    position: relative;
}

.timeline-item:nth-child(odd) {
    justify-content: flex-start;
    padding-right: 52%;
}

.timeline-item:nth-child(even) {
    justify-content: flex-end;
    padding-left: 52%;
}

.timeline-content {
    background: var(--white);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.timeline-content h4 {
    color: var(--primary-dark);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ============================================
   Lazy Loading
   ============================================ */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s;
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .process-steps {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-top {
        display: none;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        box-shadow: var(--shadow-lg);
        padding: 16px;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
    }
    
    .hero {
        height: 400px;
    }
    
    .hero-content h2 {
        font-size: 1.8rem;
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .case-grid {
        grid-template-columns: 1fr;
    }
    
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .solution-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .news-item {
        grid-template-columns: 1fr;
    }
    
    .honor-grid {
        grid-template-columns: 1fr;
    }
    
    .page-banner {
        height: 200px;
    }
    
    .page-banner-content h2 {
        font-size: 1.6rem;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item:nth-child(odd),
    .timeline-item:nth-child(even) {
        padding-left: 50px;
        padding-right: 0;
        justify-content: flex-start;
    }
    
    .section {
        padding: 48px 0;
    }
}

@media (max-width: 480px) {
    .hero-content h2 {
        font-size: 1.4rem;
    }
    
    .section-title h2 {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}