/**
 * Header 样式修复 - 参考 jurenpackaging.com
 * 流式布局，非固定定位
 */

/* ========================================
   顶部联系条
   ======================================== */
.top-bar {
    background: #2c2c2c; /* 深灰色背景 */
    color: var(--bg-white);
    padding: 10px 0;
    font-size: 0.9rem;
    position: relative;
    z-index: 1001;
}

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

.top-contact {
    display: flex;
    gap: 25px;
    align-items: center;
}

.top-contact span {
    display: flex;
    align-items: center;
    gap: 8px;
}

.top-contact i {
    color: var(--secondary-color);
}

.top-social {
    display: flex;
    gap: 15px;
    align-items: center;
}

.top-social a {
    color: var(--bg-white);
    font-size: 1rem;
    opacity: 0.8;
    transition: var(--transition);
}

.top-social a:hover {
    opacity: 1;
    color: var(--secondary-color);
}

/* 移动端隐藏联系条 */
@media (max-width: 768px) {
    .top-bar {
        display: none;
    }
}

/* ========================================
   导航栏 - 非固定定位
   ======================================== */
.navbar {
    position: relative; /* 改为相对定位，非固定 */
    top: 0;
    width: 100%;
    background: var(--bg-white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    z-index: 1000;
}

.navbar.scrolled {
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 1.5rem;
}

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

.logo-name {
    font-size: 1.3rem;
    font-weight: 900;
    color: var(--primary-color);
    letter-spacing: 0.5px;
}

.logo-tagline {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
}

.nav-menu {
    display: flex;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    padding: 10px 16px;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    text-decoration: none;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.quote-btn {
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-hover));
    color: var(--bg-white);
    font-weight: 600;
    border-radius: var(--border-radius);
    font-size: 0.95rem;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    transition: var(--transition);
}

.quote-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   移动端导航栏
   ======================================== */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 10px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: var(--transition);
    border-radius: 2px;
}

@media (max-width: 768px) {
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-white);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        transition: var(--transition);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-menu li {
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-menu li:last-child {
        border-bottom: none;
    }
    
    .nav-link {
        display: block;
        padding: 15px 20px;
        font-size: 1.05rem;
    }
    
    .quote-btn {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .logo-name {
        font-size: 1.1rem;
    }
    
    .logo-tagline {
        display: none;
    }
}

/* ========================================
   Page Header - 消除重叠
   ======================================== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 100px 0 80px;
    text-align: center;
    color: var(--bg-white);
    /* 不再使用 margin-top，正常流式布局 */
    margin-top: 0;
}

.page-header-content h1 {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 20px;
    letter-spacing: 1px;
    padding: 0 20px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1rem;
    opacity: 0.9;
    flex-wrap: wrap;
    padding: 0 20px;
}

.breadcrumb a {
    color: var(--bg-white);
    transition: var(--transition);
}

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

.breadcrumb i {
    font-size: 0.75rem;
}

/* 移动端 Page Header */
@media (max-width: 768px) {
    .page-header {
        padding: 80px 0 60px;
    }
    
    .page-header-content h1 {
        font-size: 2.2rem;
    }
    
    .breadcrumb {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .page-header {
        padding: 60px 0 50px;
    }
    
    .page-header-content h1 {
        font-size: 1.8rem;
    }
}

/* ========================================
   Hero Section - 首页 Banner
   ======================================== */
.hero-section {
    /* 不再使用 margin-top，正常流式布局 */
    margin-top: 0;
    position: relative;
}

/* ========================================
   锚点定位优化
   ======================================== */
section[id] {
    /* 移除 scroll-margin-top，因为导航栏不再是 fixed */
    scroll-margin-top: 0;
}

/* ========================================
   博客详情页 Header
   ======================================== */
.blog-page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 100px 0 80px;
    text-align: center;
    color: var(--bg-white);
    margin-top: 0;
}

.blog-page-header .page-header-content h1 {
    font-size: 2.5rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.3;
}

@media (max-width: 768px) {
    .blog-page-header {
        padding: 80px 0 60px;
    }
    
    .blog-page-header .page-header-content h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .blog-page-header {
        padding: 60px 0 50px;
    }
    
    .blog-page-header .page-header-content h1 {
        font-size: 1.6rem;
    }
}

/* ========================================
   产品详情页 Header
   ======================================== */
.product-page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 100px 0 80px;
    text-align: center;
    color: var(--bg-white);
    margin-top: 0;
}

@media (max-width: 768px) {
    .product-page-header {
        padding: 80px 0 60px;
    }
}

@media (max-width: 480px) {
    .product-page-header {
        padding: 60px 0 50px;
    }
}

/* ========================================
   消除所有可能的间隙
   ======================================== */

/* 确保顶部联系条和导航栏之间无间隙 */
.top-bar + .navbar {
    margin-top: 0;
}

/* 确保导航栏和下一个 section 无间隙 */
.navbar + .hero-section,
.navbar + .page-header,
.navbar + .blog-page-header,
.navbar + .product-page-header {
    margin-top: 0;
}

/* 确保 Page Header 和下一个 section 无间隙 */
.page-header + section,
.blog-page-header + .blog-detail-section,
.product-page-header + .product-main-section {
    margin-top: 0;
}

/* Hero Features 消除间隙 */
.hero-features {
    margin-top: -1px;
    position: relative;
    z-index: 10;
}