/* ===================================================
   开云体育官网 - 主样式文件
   kaiyun.com | 体育赛事视频 | 赛事直播视频
   =================================================== */

/* ===== CSS 变量 ===== */
:root {
    --brand-blue: #0057b8;
    --brand-dark-blue: #003d8a;
    --brand-light-blue: #e8f0fb;
    --brand-orange: #ff6b00;
    --brand-orange-light: #fff3e8;
    --brand-dark: #1a1a2e;
    --brand-text: #333;
    --brand-text-light: #666;
    --brand-gray: #f5f7fa;
    --brand-border: #e0e8f5;
    --brand-white: #fff;
    --brand-shadow: 0 4px 20px rgba(0, 87, 184, 0.12);
    --brand-shadow-hover: 0 8px 40px rgba(0, 87, 184, 0.22);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
    --font-main: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', sans-serif;
}

/* ===== 重置与基础 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-main);
    color: var(--brand-text);
    background: var(--brand-white);
    line-height: 1.6;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
a:hover { color: var(--brand-blue); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { font-family: var(--font-main); cursor: pointer; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== 懒加载图片 ===== */
img.lazy-img { opacity: 0; transition: opacity 0.4s; }
img.lazy-img.loaded { opacity: 1; }

/* ===== 滚动动画 ===== */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== 按钮 ===== */
.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, var(--brand-blue), var(--brand-dark-blue));
    color: white;
    padding: 12px 28px;
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    transition: var(--transition);
    box-shadow: 0 4px 16px rgba(0, 87, 184, 0.3);
}
.btn-primary:hover {
    background: linear-gradient(135deg, var(--brand-dark-blue), #002a6e);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(0, 87, 184, 0.4);
}
.btn-secondary {
    display: inline-block;
    background: transparent;
    color: var(--brand-blue);
    padding: 11px 28px;
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    font-weight: 600;
    border: 2px solid var(--brand-blue);
    transition: var(--transition);
}
.btn-secondary:hover {
    background: var(--brand-blue);
    color: white;
    transform: translateY(-2px);
}

/* ===== 标签 ===== */
.tag {
    display: inline-block;
    background: var(--brand-light-blue);
    color: var(--brand-blue);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
}
.tag-orange {
    background: var(--brand-orange-light);
    color: var(--brand-orange);
}

/* ===== 标题 ===== */
.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--brand-dark);
    text-align: center;
    margin-bottom: 12px;
}
.section-subtitle {
    font-size: 1rem;
    color: var(--brand-text-light);
    text-align: center;
    margin-bottom: 48px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== 面包屑 ===== */
.breadcrumb { background: var(--brand-gray); padding: 12px 0; border-bottom: 1px solid var(--brand-border); }
.breadcrumb ol { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.breadcrumb li { font-size: 0.85rem; color: var(--brand-text-light); }
.breadcrumb li::after { content: ' /'; margin-left: 8px; }
.breadcrumb li:last-child::after { content: ''; }
.breadcrumb a { color: var(--brand-blue); }
.breadcrumb a:hover { text-decoration: underline; }

/* ===== 页面Hero ===== */
.page-hero {
    background: linear-gradient(135deg, var(--brand-dark-blue) 0%, var(--brand-blue) 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}
.page-hero h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 12px; }
.page-hero p { font-size: 1rem; opacity: 0.85; }

/* ===== HEADER ===== */
#header {
    background: linear-gradient(135deg, var(--brand-dark-blue) 0%, var(--brand-blue) 100%);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 87, 184, 0.3);
}
.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    max-width: 1200px;
    margin: 0 auto;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon {
    width: 44px; height: 44px;
    background: linear-gradient(135deg, var(--brand-orange), #e05500);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    color: white; font-size: 1.3rem; font-weight: 900;
    box-shadow: 0 4px 12px rgba(255, 107, 0, 0.4);
}
.logo-text { font-size: 1.25rem; font-weight: 800; color: white; }
.logo-text span { color: var(--brand-orange); }
.header-cta { display: flex; align-items: center; gap: 14px; }

/* ===== 汉堡菜单 ===== */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { display: block; width: 24px; height: 2px; background: white; border-radius: 2px; transition: var(--transition); }
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== 搜索栏 ===== */
#search-bar {
    background: var(--brand-dark-blue);
    padding: 12px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.search-inner {
    display: flex;
    max-width: 700px;
    margin: 0 auto 8px;
    gap: 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}
#search-input {
    flex: 1;
    padding: 10px 18px;
    border: none;
    font-size: 0.9rem;
    font-family: var(--font-main);
    outline: none;
    background: white;
    color: var(--brand-text);
}
#search-btn {
    padding: 10px 24px;
    background: var(--brand-orange);
    color: white;
    border: none;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}
#search-btn:hover { background: #e05500; }
#search-tips { text-align: center; font-size: 0.8rem; color: rgba(255,255,255,0.65); }
#search-tips span {
    display: inline-block;
    background: rgba(255,255,255,0.12);
    color: rgba(255,255,255,0.85);
    padding: 2px 10px;
    border-radius: 12px;
    margin: 2px 4px;
    cursor: pointer;
    transition: var(--transition);
}
#search-tips span:hover { background: rgba(255,255,255,0.25); }

/* ===== 主导航 ===== */
#main-nav {
    background: var(--brand-blue);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.nav-list {
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.nav-list li a {
    display: block;
    padding: 14px 20px;
    color: rgba(255,255,255,0.85);
    font-size: 0.92rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}
.nav-list li a::after {
    content: '';
    position: absolute;
    bottom: 0; left: 50%; right: 50%;
    height: 3px;
    background: var(--brand-orange);
    transition: var(--transition);
}
.nav-list li a:hover,
.nav-list li a.active {
    color: white;
    background: rgba(255,255,255,0.1);
}
.nav-list li a:hover::after,
.nav-list li a.active::after { left: 0; right: 0; }

/* ===== 移动端导航 ===== */
#mobile-nav {
    background: var(--brand-dark-blue);
    border-top: 1px solid rgba(255,255,255,0.1);
}
#mobile-nav .nav-list { flex-direction: column; padding: 0; }
#mobile-nav .nav-list li a {
    padding: 14px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    font-size: 0.95rem;
}

/* ===== HERO SLIDER ===== */
#hero { position: relative; overflow: hidden; height: 520px; }
.slider-wrapper {
    display: flex;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.slide {
    min-width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    position: relative;
    display: flex;
    align-items: center;
}
.slide-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,61,138,0.85) 0%, rgba(0,87,184,0.6) 100%);
}
.slide-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
    padding: 0 60px;
    color: white;
}
.slide-tag {
    display: inline-block;
    background: var(--brand-orange);
    color: white;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 16px;
}
.slide-content h1 {
    font-size: 2.4rem;
    font-weight: 900;
    line-height: 1.25;
    margin-bottom: 14px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.slide-content p {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: 28px;
    line-height: 1.7;
}
.slide-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.slider-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.15);
    color: white;
    border: 2px solid rgba(255,255,255,0.4);
    width: 48px; height: 48px;
    border-radius: 50%;
    font-size: 1.6rem;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    z-index: 10;
}
.slider-arrow:hover { background: rgba(255,255,255,0.3); border-color: white; }
.slider-arrow.prev { left: 20px; }
.slider-arrow.next { right: 20px; }
.slider-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 10;
}
.slider-dots span {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    cursor: pointer;
    transition: var(--transition);
}
.slider-dots span.active {
    background: white;
    width: 28px;
    border-radius: 5px;
}

/* ===== 统计栏 ===== */
#stats-bar { background: linear-gradient(135deg, var(--brand-dark-blue), var(--brand-blue)); padding: 28px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.stat-item {
    text-align: center;
    padding: 16px;
    border-right: 1px solid rgba(255,255,255,0.15);
}
.stat-item:last-child { border-right: none; }
.stat-num { font-size: 2rem; font-weight: 900; color: white; margin-bottom: 4px; }
.stat-label { font-size: 0.82rem; color: rgba(255,255,255,0.75); }

/* ===== 视频网格 ===== */
#video-section { padding: 80px 0; background: var(--brand-gray); }
.video-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.video-card {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--brand-shadow);
    transition: var(--transition);
    cursor: pointer;
}
.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--brand-shadow-hover);
}
.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: #111;
}
.video-thumb img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0);
    transition: var(--transition);
}
.play-btn svg {
    width: 52px; height: 52px;
    fill: white;
    opacity: 0;
    transform: scale(0.8);
    transition: var(--transition);
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.5));
    background: rgba(0,87,184,0.85);
    border-radius: 50%;
    padding: 12px;
}
.video-card:hover .play-btn { background: rgba(0,0,0,0.3); }
.video-card:hover .play-btn svg { opacity: 1; transform: scale(1); }
.video-duration {
    position: absolute;
    bottom: 8px; right: 8px;
    background: rgba(0,0,0,0.75);
    color: white;
    font-size: 0.78rem;
    padding: 2px 8px;
    border-radius: 4px;
}
.video-info { padding: 14px; }
.video-info h4 { font-size: 0.9rem; font-weight: 600; color: var(--brand-dark); margin: 8px 0 10px; line-height: 1.4; }
.video-meta { display: flex; gap: 12px; font-size: 0.78rem; color: var(--brand-text-light); }

/* ===== 关于模块 ===== */
#about-section { padding: 80px 0; background: white; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-img img { border-radius: var(--radius-lg); box-shadow: var(--brand-shadow-hover); }
.about-content .tag { margin-bottom: 12px; }
.about-content h2 { font-size: 1.9rem; font-weight: 800; color: var(--brand-dark); margin: 12px 0 16px; }
.about-content p { color: var(--brand-text-light); line-height: 1.8; margin-bottom: 14px; }
.about-values { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 24px 0; }
.value-item { background: var(--brand-light-blue); border-radius: var(--radius-sm); padding: 14px; }
.value-item h5 { font-size: 0.9rem; font-weight: 700; color: var(--brand-dark-blue); margin-bottom: 4px; }
.value-item p { font-size: 0.82rem; color: var(--brand-text-light); margin: 0; }

/* ===== 服务模块 ===== */
#services-section { padding: 80px 0; background: var(--brand-gray); }
.services-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.service-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 28px 22px;
    text-align: center;
    box-shadow: var(--brand-shadow);
    transition: var(--transition);
    border-top: 4px solid transparent;
}
.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--brand-shadow-hover);
    border-top-color: var(--brand-blue);
}
.service-icon { font-size: 2.5rem; margin-bottom: 16px; }
.service-card h3 { font-size: 1rem; font-weight: 700; color: var(--brand-dark); margin-bottom: 10px; }
.service-card p { font-size: 0.85rem; color: var(--brand-text-light); line-height: 1.7; }

/* ===== 案例模块 ===== */
#cases-section { padding: 80px 0; background: white; }
.cases-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.case-card {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--brand-shadow);
    transition: var(--transition);
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--brand-shadow-hover); }
.case-img { aspect-ratio: 16/7; overflow: hidden; }
.case-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.case-card:hover .case-img img { transform: scale(1.04); }
.case-body { padding: 22px; }
.case-body h3 { font-size: 1.05rem; font-weight: 700; color: var(--brand-dark); margin: 10px 0 10px; }
.case-body p { font-size: 0.88rem; color: var(--brand-text-light); line-height: 1.7; margin-bottom: 14px; }
.case-results { display: flex; gap: 10px; flex-wrap: wrap; }
.case-results span {
    background: var(--brand-light-blue);
    color: var(--brand-blue);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 12px;
}

/* ===== 资讯模块 ===== */
#news-section { padding: 80px 0; background: var(--brand-gray); }
.news-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.news-main { background: white; border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--brand-shadow); }
.news-main-img { aspect-ratio: 16/7; overflow: hidden; }
.news-main-img img { width: 100%; height: 100%; object-fit: cover; }
.news-main-body { padding: 22px; }
.news-main-body h3 { font-size: 1.1rem; font-weight: 700; color: var(--brand-dark); margin: 10px 0 10px; }
.news-main-body p { font-size: 0.88rem; color: var(--brand-text-light); line-height: 1.7; }
.news-list { display: flex; flex-direction: column; gap: 14px; }
.news-item {
    background: white;
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,87,184,0.08);
    display: flex;
    gap: 0;
    transition: var(--transition);
}
.news-item:hover { transform: translateX(4px); box-shadow: var(--brand-shadow); }
.news-item-img { width: 110px; flex-shrink: 0; overflow: hidden; }
.news-item-img img { width: 100%; height: 100%; object-fit: cover; }
.news-item-body { padding: 12px 14px; flex: 1; }
.news-item-body h4 { font-size: 0.88rem; font-weight: 600; color: var(--brand-dark); line-height: 1.4; margin-bottom: 6px; }
.meta { font-size: 0.78rem; color: var(--brand-text-light); }

/* ===== 用户评价 ===== */
#reviews-section { padding: 80px 0; background: white; }
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.review-card {
    background: var(--brand-gray);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
    border-left: 4px solid transparent;
}
.review-card:hover { border-left-color: var(--brand-blue); transform: translateY(-4px); box-shadow: var(--brand-shadow); }
.review-header { display: flex; gap: 12px; align-items: center; margin-bottom: 12px; }
.review-avatar {
    width: 44px; height: 44px;
    background: linear-gradient(135deg, var(--brand-blue), var(--brand-dark-blue));
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: white; font-size: 1.1rem; font-weight: 700;
    flex-shrink: 0;
}
.review-user h5 { font-size: 0.9rem; font-weight: 700; color: var(--brand-dark); margin-bottom: 2px; }
.platform { font-size: 0.78rem; color: var(--brand-text-light); }
.stars { color: #f5a623; font-size: 1rem; margin-bottom: 10px; }
.review-text { font-size: 0.88rem; color: var(--brand-text-light); line-height: 1.7; margin-bottom: 12px; font-style: italic; }
.review-likes { font-size: 0.78rem; color: var(--brand-text-light); }

/* ===== FAQ ===== */
#faq-section { padding: 80px 0; background: var(--brand-gray); }
.faq-grid { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: white; border-radius: var(--radius-sm); overflow: hidden; box-shadow: 0 2px 8px rgba(0,87,184,0.06); }
.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 22px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--brand-dark);
    transition: var(--transition);
}
.faq-question:hover, .faq-question.active { background: var(--brand-light-blue); color: var(--brand-blue); }
.faq-icon { font-size: 1.2rem; font-weight: 300; color: var(--brand-blue); transition: var(--transition); }
.faq-question.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    padding: 0 22px;
}
.faq-answer.open { max-height: 200px; padding: 0 22px 18px; }
.faq-answer p { font-size: 0.9rem; color: var(--brand-text-light); line-height: 1.8; }

/* ===== 合作伙伴 ===== */
#partners-section { padding: 70px 0; background: white; }
.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
    margin-top: 0;
}
.partner-logo {
    background: var(--brand-gray);
    border: 1px solid var(--brand-border);
    border-radius: var(--radius-sm);
    padding: 16px 12px;
    text-align: center;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--brand-text-light);
    transition: var(--transition);
}
.partner-logo:hover { border-color: var(--brand-blue); color: var(--brand-blue); background: var(--brand-light-blue); }

/* ===== 联系模块 ===== */
#contact-section { padding: 80px 0; background: var(--brand-gray); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.contact-info h3 { font-size: 1.5rem; font-weight: 800; color: var(--brand-dark); margin-bottom: 24px; }
.contact-item { display: flex; gap: 14px; margin-bottom: 18px; align-items: flex-start; }
.contact-icon { font-size: 1.4rem; flex-shrink: 0; margin-top: 2px; }
.contact-item h5 { font-size: 0.85rem; font-weight: 700; color: var(--brand-text-light); margin-bottom: 3px; }
.contact-item p { font-size: 0.92rem; color: var(--brand-dark); }
.map-placeholder {
    background: var(--brand-light-blue);
    border: 2px dashed var(--brand-blue);
    border-radius: var(--radius-md);
    height: 280px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--brand-blue);
    font-weight: 600;
    gap: 8px;
}
.map-placeholder small { font-size: 0.82rem; color: var(--brand-text-light); font-weight: 400; }

/* ===== FOOTER ===== */
#footer { background: linear-gradient(135deg, #0d1b3e 0%, #1a2f5e 100%); color: rgba(255,255,255,0.8); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { font-size: 0.85rem; line-height: 1.8; color: rgba(255,255,255,0.65); margin-bottom: 20px; }
.footer-qr { display: flex; gap: 20px; }
.qr-item { text-align: center; }
.qr-box {
    width: 70px; height: 70px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.7rem; color: rgba(255,255,255,0.6);
    margin-bottom: 6px;
    text-align: center;
}
.qr-item span { font-size: 0.75rem; color: rgba(255,255,255,0.5); }
.footer-col h4 { font-size: 0.95rem; font-weight: 700; color: white; margin-bottom: 16px; padding-bottom: 10px; border-bottom: 1px solid rgba(255,255,255,0.1); }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 0.85rem; color: rgba(255,255,255,0.6); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--brand-orange); padding-left: 4px; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
}
.footer-bottom p { font-size: 0.8rem; color: rgba(255,255,255,0.45); }
.footer-social { display: flex; gap: 10px; }
.social-btn {
    width: 36px; height: 36px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: rgba(255,255,255,0.7);
    font-size: 0.8rem;
    font-weight: 700;
    transition: var(--transition);
}
.social-btn:hover { background: var(--brand-orange); border-color: var(--brand-orange); color: white; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .video-grid { grid-template-columns: repeat(2, 1fr); }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .partners-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .section-title { font-size: 1.5rem; }
    .section-subtitle { font-size: 0.9rem; margin-bottom: 32px; }
    .hamburger { display: flex; }
    #main-nav { display: none; }
    .slide-content { padding: 0 24px; }
    .slide-content h1 { font-size: 1.5rem; }
    #hero { height: 380px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.15); }
    .stat-item:nth-child(2n) { border-right: none; }
    .about-grid { grid-template-columns: 1fr; gap: 28px; }
    .video-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
    .services-grid { grid-template-columns: 1fr 1fr; }
    .cases-grid { grid-template-columns: 1fr; }
    .news-grid { grid-template-columns: 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .partners-grid { grid-template-columns: repeat(2, 1fr); }
    .about-values { grid-template-columns: 1fr; }
    .page-hero h1 { font-size: 1.6rem; }
    .slide-btns { flex-direction: column; gap: 10px; }
    .slide-btns .btn-primary,
    .slide-btns .btn-secondary { text-align: center; }
}

@media (max-width: 480px) {
    .video-grid { grid-template-columns: 1fr; }
    .services-grid { grid-template-columns: 1fr; }
    .header-top { padding: 12px 16px; }
    .logo-text { font-size: 1.1rem; }
    .logo-icon { width: 38px; height: 38px; font-size: 1.1rem; }
    #hero { height: 320px; }
    .slide-content h1 { font-size: 1.25rem; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .stat-num { font-size: 1.5rem; }
    .section-title { font-size: 1.3rem; }
}

/* ===== 打印样式 ===== */
@media print {
    #header, #search-bar, #main-nav, #mobile-nav, .slider-arrow, .slider-dots, #footer { display: none; }
    body { font-size: 12pt; color: black; }
    a { color: black; }
}