/* =============================================
   每日大赛 - 主样式文件
   网站：d25aqi.cn
   ============================================= */

/* 基础重置与全局变量 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #e8321a;
    --primary-dark: #c0271a;
    --secondary: #ff6b35;
    --accent: #ffd700;
    --dark: #1a1a2e;
    --dark-2: #16213e;
    --gray: #6c757d;
    --gray-light: #f8f9fa;
    --white: #ffffff;
    --text: #333333;
    --text-light: #666666;
    --border: #e0e0e0;
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
    --shadow-hover: 0 8px 30px rgba(232,50,26,0.25);
    --radius: 10px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
    --font-main: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', sans-serif;
}

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

body {
    font-family: var(--font-main);
    color: var(--text);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

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

ul {
    list-style: none;
}

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

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    text-align: center;
    margin-bottom: 15px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    margin: 15px auto 0;
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.05rem;
    margin-bottom: 50px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    box-shadow: 0 4px 15px rgba(232,50,26,0.35);
}

.btn-primary:hover {
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(232,50,26,0.45);
}

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

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

.tag {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(232,50,26,0.1);
    color: var(--primary);
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-right: 5px;
    margin-bottom: 5px;
}

/* =============================================
   顶部导航
   ============================================= */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--white);
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    flex-shrink: 0;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    font-weight: 900;
}

.nav-menu {
    display: flex;
    gap: 5px;
    align-items: center;
}

.nav-menu a {
    padding: 8px 14px;
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 6px;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
    background: rgba(232,50,26,0.08);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* 搜索框 */
.search-bar-wrapper {
    background: var(--gray-light);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
}

.search-bar-inner {
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 600px;
    margin: 0 auto;
    padding: 0 20px;
}

.search-input {
    flex: 1;
    padding: 10px 18px;
    border: 2px solid var(--border);
    border-radius: 50px;
    font-size: 0.95rem;
    font-family: var(--font-main);
    outline: none;
    transition: var(--transition);
    background: var(--white);
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(232,50,26,0.1);
}

.search-btn {
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    border: none;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-main);
    white-space: nowrap;
}

.search-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(232,50,26,0.35);
}

/* =============================================
   首屏Banner
   ============================================= */
.banner {
    position: relative;
    min-height: 560px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 50%, #0f3460 100%);
}

.banner-bg {
    position: absolute;
    inset: 0;
    background-image: url('/assets/images/banner.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.25;
}

.banner-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    padding: 60px 0;
}

.banner-badge {
    display: inline-block;
    background: rgba(255,215,0,0.15);
    border: 1px solid rgba(255,215,0,0.4);
    color: var(--accent);
    padding: 5px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.banner h1 {
    font-size: 2.8rem;
    font-weight: 900;
    color: var(--white);
    line-height: 1.25;
    margin-bottom: 20px;
}

.banner h1 span {
    color: var(--secondary);
}

.banner-desc {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.8);
    margin-bottom: 30px;
    line-height: 1.8;
}

.banner-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 35px;
}

.banner-highlights li {
    display: flex;
    align-items: center;
    gap: 6px;
    color: rgba(255,255,255,0.85);
    font-size: 0.95rem;
}

.banner-highlights li::before {
    content: '✓';
    width: 20px;
    height: 20px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    flex-shrink: 0;
    color: white;
}

.banner-btns {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.banner-stats {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 20px;
    z-index: 1;
}

.stat-card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius);
    padding: 20px 28px;
    text-align: center;
    color: var(--white);
}

.stat-card .num {
    font-size: 2rem;
    font-weight: 900;
    color: var(--accent);
    line-height: 1;
}

.stat-card .label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.7);
    margin-top: 5px;
}

/* =============================================
   视频卡片区域
   ============================================= */
.video-section {
    background: var(--gray-light);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.video-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.video-thumb {
    position: relative;
    padding-top: 56.25%; /* 16:9 */
    overflow: hidden;
    background: var(--dark);
}

.video-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.video-card:hover .video-thumb img {
    transform: scale(1.05);
}

.video-play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.3);
    opacity: 0;
    transition: var(--transition);
}

.video-card:hover .video-play-btn {
    opacity: 1;
}

.play-icon {
    width: 60px;
    height: 60px;
    background: rgba(232,50,26,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(5px);
    transform: scale(0.8);
    transition: var(--transition);
}

.video-card:hover .play-icon {
    transform: scale(1);
}

.play-icon::after {
    content: '';
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent white;
    margin-left: 4px;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 10px;
    background: rgba(0,0,0,0.75);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.video-info {
    padding: 16px;
}

.video-info h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.82rem;
    color: var(--gray);
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.video-tags {
    margin-top: 10px;
}

/* =============================================
   品牌介绍模块
   ============================================= */
.about-section {
    background: var(--white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-img {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.about-img img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.about-content h2 {
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 15px;
}

.about-content p {
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.8;
}

.timeline {
    margin-top: 30px;
}

.timeline-item {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.timeline-dot {
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 6px;
    position: relative;
}

.timeline-dot::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 12px;
    width: 2px;
    height: calc(100% + 10px);
    background: var(--border);
}

.timeline-item:last-child .timeline-dot::after {
    display: none;
}

.timeline-year {
    font-weight: 700;
    color: var(--primary);
    font-size: 0.9rem;
}

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

.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.value-item {
    text-align: center;
    padding: 20px 15px;
    background: var(--gray-light);
    border-radius: var(--radius);
}

.value-icon {
    font-size: 2rem;
    margin-bottom: 10px;
}

.value-item h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 5px;
}

.value-item p {
    font-size: 0.82rem;
    color: var(--text-light);
    margin: 0;
}

/* =============================================
   品牌服务模块
   ============================================= */
.services-section {
    background: var(--gray-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

.service-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-top: 4px solid transparent;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-top-color: var(--primary);
}

.service-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, rgba(232,50,26,0.1), rgba(255,107,53,0.1));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.service-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* 流程步骤 */
.workflow {
    margin-top: 60px;
}

.workflow-title {
    text-align: center;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 30px;
}

.workflow-steps {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 0;
}

.workflow-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 0 20px;
}

.step-num {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    margin-bottom: 10px;
    flex-shrink: 0;
}

.step-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--dark);
}

.workflow-arrow {
    font-size: 1.5rem;
    color: var(--primary);
    margin: 0 5px;
    margin-bottom: 20px;
}

/* =============================================
   品牌案例模块
   ============================================= */
.cases-section {
    background: var(--white);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.case-card {
    background: var(--gray-light);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
    border-left: 4px solid var(--primary);
}

.case-card:hover {
    background: var(--white);
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.case-industry {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 3px 12px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.case-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
    line-height: 1.5;
}

.case-data {
    color: var(--text-light);
    font-size: 0.88rem;
    line-height: 1.6;
}

.case-data strong {
    color: var(--primary);
}

/* 数据统计 */
.stats-bar {
    background: linear-gradient(135deg, var(--dark), var(--dark-2));
    padding: 50px 0;
    margin-top: 50px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item .num {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--accent);
    line-height: 1;
}

.stat-item .unit {
    font-size: 1.2rem;
    color: var(--secondary);
}

.stat-item .label {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
    margin-top: 8px;
}

/* =============================================
   品牌资讯模块
   ============================================= */
.news-section {
    background: var(--gray-light);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

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

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

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

.news-category {
    display: inline-block;
    background: rgba(232,50,26,0.1);
    color: var(--primary);
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.news-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
    line-height: 1.5;
}

.news-card p {
    color: var(--text-light);
    font-size: 0.88rem;
    line-height: 1.6;
    margin-bottom: 15px;
}

.news-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.82rem;
    color: var(--gray);
}

/* =============================================
   品牌口碑模块
   ============================================= */
.reviews-section {
    background: var(--white);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.review-card {
    background: var(--gray-light);
    border-radius: var(--radius-lg);
    padding: 28px;
    position: relative;
    transition: var(--transition);
}

.review-card:hover {
    background: var(--white);
    box-shadow: var(--shadow);
}

.review-card::before {
    content: '"';
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 4rem;
    color: rgba(232,50,26,0.1);
    font-family: Georgia, serif;
    line-height: 1;
}

.stars {
    color: var(--accent);
    font-size: 1rem;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.review-text {
    color: var(--text-light);
    font-size: 0.92rem;
    line-height: 1.7;
    margin-bottom: 18px;
}

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

.reviewer-avatar {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.reviewer-name {
    font-weight: 700;
    color: var(--dark);
    font-size: 0.95rem;
}

.reviewer-role {
    color: var(--gray);
    font-size: 0.82rem;
}

/* =============================================
   FAQ模块
   ============================================= */
.faq-section {
    background: var(--gray-light);
}

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

.faq-item {
    background: var(--white);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 20px 24px;
    text-align: left;
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
    font-family: var(--font-main);
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary);
}

.faq-arrow {
    width: 24px;
    height: 24px;
    background: rgba(232,50,26,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition);
    color: var(--primary);
    font-size: 0.8rem;
}

.faq-item.active .faq-arrow {
    transform: rotate(180deg);
    background: var(--primary);
    color: white;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer-inner {
    padding: 0 24px 20px;
    color: var(--text-light);
    font-size: 0.92rem;
    line-height: 1.7;
    border-top: 1px solid var(--border);
    padding-top: 15px;
}

/* =============================================
   合作伙伴
   ============================================= */
.partners-section {
    background: var(--white);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
    align-items: center;
}

.partner-logo {
    background: var(--gray-light);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    font-weight: 700;
    color: var(--gray);
    font-size: 0.9rem;
    transition: var(--transition);
    border: 2px solid transparent;
}

.partner-logo:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(232,50,26,0.05);
}

/* =============================================
   联系模块
   ============================================= */
.contact-section {
    background: var(--gray-light);
}

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

.contact-info h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 25px;
}

.contact-item {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    align-items: flex-start;
}

.contact-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.contact-label {
    font-size: 0.82rem;
    color: var(--gray);
    margin-bottom: 3px;
}

.contact-value {
    font-weight: 600;
    color: var(--dark);
    font-size: 0.95rem;
}

.map-placeholder {
    background: var(--border);
    border-radius: var(--radius-lg);
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray);
    font-size: 1rem;
    font-weight: 600;
    border: 2px dashed var(--border);
}

/* =============================================
   页脚
   ============================================= */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 30px;
}

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

.footer-brand .logo {
    color: white;
    margin-bottom: 15px;
}

.footer-brand p {
    font-size: 0.88rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer-qr {
    display: flex;
    gap: 20px;
}

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

.qr-box {
    width: 80px;
    height: 80px;
    background: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 6px;
    font-size: 0.65rem;
    color: var(--dark);
    font-weight: 600;
    text-align: center;
    padding: 5px;
    line-height: 1.3;
}

.qr-label {
    font-size: 0.78rem;
    color: rgba(255,255,255,0.5);
}

.footer-col h4 {
    color: white;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 18px;
}

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

.footer-col ul li a {
    color: rgba(255,255,255,0.6);
    font-size: 0.88rem;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    font-size: 0.85rem;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.7);
    font-size: 0.85rem;
    transition: var(--transition);
}

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

/* =============================================
   面包屑
   ============================================= */
.breadcrumb {
    background: var(--gray-light);
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--gray);
}

.breadcrumb-list a {
    color: var(--gray);
}

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

.breadcrumb-sep {
    color: var(--border);
}

/* =============================================
   页面英雄区
   ============================================= */
.page-hero {
    background: linear-gradient(135deg, var(--dark), var(--dark-2));
    padding: 60px 0;
    text-align: center;
    color: white;
}

.page-hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 15px;
}

.page-hero p {
    color: rgba(255,255,255,0.75);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
    .banner h1 { font-size: 2.2rem; }
    .banner-stats { display: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .partners-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .section { padding: 55px 0; }
    .section-title { font-size: 1.6rem; }
    .banner h1 { font-size: 1.8rem; }
    .banner { min-height: 480px; }

    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 15px;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        gap: 5px;
    }

    .nav-menu.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .about-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .values-grid { grid-template-columns: 1fr 1fr; }
    .workflow-steps { flex-direction: column; }
    .workflow-arrow { transform: rotate(90deg); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .partners-grid { grid-template-columns: repeat(2, 1fr); }
    .banner-btns { flex-direction: column; }
    .banner-btns .btn { text-align: center; }
}

@media (max-width: 480px) {
    .section-title { font-size: 1.4rem; }
    .banner h1 { font-size: 1.5rem; }
    .video-grid { grid-template-columns: 1fr; }
    .services-grid { grid-template-columns: 1fr; }
    .cases-grid { grid-template-columns: 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }
    .news-grid { grid-template-columns: 1fr; }
    .values-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .partners-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 懒加载占位 */
img[loading="lazy"] {
    background: var(--gray-light);
}

/* 滚动动画 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}