/* ============================================
   导航栏样式
   ============================================ */

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    min-height: var(--header-height);
    background: linear-gradient(180deg, rgba(247, 249, 252, 0.95), rgba(255, 255, 255, 0.9));
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
    z-index: 1000;
    border-bottom: 1px solid rgba(30, 58, 95, 0.08);
    backdrop-filter: blur(18px);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    gap: var(--spacing-xl);
}

.logo {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: var(--spacing-xs);
    max-width: 320px;
    text-decoration: none;
    color: var(--primary-color);
    transition: all var(--transition-fast);
}

.logo:hover .logo-name {
    color: var(--accent-color);
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-xs) / 2);
    line-height: 1.25;
}

.logo-name {
    font-size: 20px;
    font-weight: var(--font-weight-bold);
    color: var(--primary-color-dark);
    letter-spacing: 0.04em;
}

.logo-tagline {
    font-size: 12px;
    font-weight: var(--font-weight-medium);
    color: var(--secondary-color);
    letter-spacing: 0.06em;
}

/* 导航菜单 */
nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-color-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    border-bottom: 2px solid transparent;
    border-radius: var(--border-radius-lg);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: rgba(30, 58, 95, 0.08);
}

/* 下拉菜单 */
.dropdown {
    position: relative;
}

.dropdown-toggle::after {
    content: '▼';
    display: inline-block;
    margin-left: var(--spacing-xs);
    font-size: 10px;
    transition: transform var(--transition-fast);
}

.dropdown:hover .dropdown-toggle::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-color-white);
    border: 1px solid var(--border-color-light);
    border-radius: var(--border-radius-md);
    box-shadow: var(--box-shadow-lg);
    list-style: none;
    padding: var(--spacing-sm) 0;
    margin: 0;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: 999;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--text-color-primary);
    text-decoration: none;
    display: block;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.dropdown-item:hover {
    background-color: var(--bg-color-light);
    color: var(--primary-color);
    padding-left: var(--spacing-xl);
}

/* 二级下拉菜单 */
.dropdown-submenu {
    position: relative;
}

.dropdown-submenu > .dropdown-menu {
    position: absolute;
    top: 0;
    left: 100%;
    margin-left: var(--spacing-sm);
}

.dropdown-submenu:hover > .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.dropdown-submenu .dropdown-menu {
    transform: translateX(-10px);
}

.dropdown-submenu > .dropdown-item::after {
    content: '▶';
    position: absolute;
    right: var(--spacing-md);
    font-size: 10px;
}

/* 右侧操作区 */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-phone {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 10px 16px;
    border-radius: var(--border-radius-lg);
    background: rgba(30, 58, 95, 0.06);
    border: 1px solid rgba(30, 58, 95, 0.1);
    color: var(--text-color-primary);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    line-height: 1.4;
}

.header-phone:hover {
    background: rgba(30, 58, 95, 0.12);
    border-color: rgba(30, 58, 95, 0.2);
    box-shadow: var(--box-shadow-sm);
}

.header-phone .phone-label {
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--secondary-color);
}

.header-phone .phone-number {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
}

/* 汉堡菜单（移动端） */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 6px;
    padding: 0;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background-color: var(--text-color-primary);
    transition: all var(--transition-fast);
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(10px, 10px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ============================================
   页脚样式
   ============================================ */

footer {
    background-color: var(--primary-color);
    color: var(--text-color-white);
    padding: var(--spacing-2xl) var(--container-padding);
    margin-top: var(--spacing-3xl);
}

.footer-container {
    max-width: var(--container-width);
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: var(--text-color-white);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-md);
}

.footer-section ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-section li {
    margin-bottom: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.8);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.footer-section a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.footer-divider {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-sm);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-full);
    color: var(--text-color-white);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background-color: var(--accent-color);
    transform: translateY(-4px);
}

/* ============================================
   响应式导航栏
   ============================================ */

@media (max-width: 768px) {
    header {
        min-height: 60px;
    }

    .header-container {
        padding: 0 16px;
    }
    
    .logo {
        gap: calc(var(--spacing-xs) / 2);
        max-width: 240px;
    }
    
    .logo-name {
        font-size: 18px;
    }
    
    .logo-tagline {
        font-size: 11px;
        letter-spacing: 0.04em;
    }
    
    nav {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background-color: var(--bg-color-white);
        flex-direction: column;
        gap: 0;
        border-bottom: 1px solid var(--border-color-light);
        box-shadow: var(--box-shadow-md);
    }
    
    nav.active {
        display: flex;
    }
    
    .nav-menu {
        flex-direction: column;
        gap: 0;
        width: 100%;
    }
    
    .header-actions {
        gap: var(--spacing-sm);
    }
    
    .header-phone {
        display: none;
    }
    
    .nav-item {
        width: 100%;
        border-bottom: 1px solid var(--divider-color);
    }
    
    .nav-link {
        padding: var(--spacing-md);
        border-bottom: none;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 0;
        visibility: hidden;
        max-height: 0;
        overflow: hidden;
        transform: none;
        box-shadow: none;
        border: none;
        background-color: var(--bg-color-light);
        transition: max-height var(--transition-normal);
    }
    
    .dropdown.active .dropdown-menu {
        opacity: 1;
        visibility: visible;
        max-height: 500px;
    }
    
    .dropdown-item {
        padding-left: var(--spacing-xl);
    }
    
    .dropdown-submenu > .dropdown-menu {
        position: static;
        margin-left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .header-actions {
        gap: var(--spacing-sm);
    }
    
    /* 页脚响应式 */
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
    
    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    header {
        min-height: 56px;
    }

    .header-container {
        padding: 0 12px;
    }
    
    .logo {
        max-width: 200px;
    }
    
    .logo-name {
        font-size: 16px;
    }
    
    .logo-tagline {
        font-size: 10px;
        letter-spacing: 0.02em;
    }
    
    nav {
        top: 56px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-social {
        width: 100%;
        justify-content: flex-start;
    }
}

/* ============================================
   页面内容间距（考虑固定导航栏）
   ============================================ */

main {
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* ============================================
   面包屑导航
   ============================================ */

.breadcrumb {
    display: flex;
    list-style: none;
    padding: var(--spacing-md) 0;
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--text-color-secondary);
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: '/';
    margin: 0 var(--spacing-sm);
    color: var(--text-color-light);
}

.breadcrumb-item a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumb-item a:hover {
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: var(--text-color-secondary);
}