/* ============================================
   力能肥业官网 - 布局和导航样式
   ============================================ */

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(124, 179, 66, 0.15);
    box-shadow: var(--box-shadow-sm);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.navbar.navbar-elevated {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--box-shadow-md);
}

.navbar-container {
    max-width: var(--max-width-container);
    margin: 0 auto;
    padding: 0 var(--gutter);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

/* ========== Logo ========== */
.navbar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-lg);
    color: var(--color-primary-dark);
    text-decoration: none;
    transition: color var(--transition-base), transform var(--transition-base);
    white-space: nowrap;
}

.navbar-logo:hover {
    color: var(--color-secondary-dark);
    transform: translateY(-2px);
}

/* ========== 导航菜单 ========== */
.navbar-menu {
    display: flex;
    flex-wrap: nowrap;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.navbar-item {
    position: relative;
}

.navbar-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.5px;
    transition: all var(--transition-base);
    border-radius: var(--border-radius-full);
    white-space: nowrap;
}

.navbar-link:hover {
    color: var(--color-secondary-dark);
    background: rgba(2, 136, 209, 0.08);
}

.navbar-link.active {
    color: var(--color-primary-dark);
    background: rgba(124, 179, 66, 0.12);
    box-shadow: inset 0 0 0 1px rgba(124, 179, 66, 0.35);
}

.navbar-item.cta .navbar-link {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
    color: var(--color-white);
    padding: calc(var(--spacing-sm) + 2px) calc(var(--spacing-md) + 6px);
    font-weight: var(--font-weight-semibold);
    box-shadow: var(--box-shadow-sm);
}

.navbar-item.cta .navbar-link:hover {
    background: linear-gradient(135deg, var(--color-secondary-dark), var(--color-primary-dark));
    box-shadow: var(--box-shadow-md);
}

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

.dropdown-toggle::after {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: var(--spacing-sm);
    vertical-align: 0.255em;
    border-top: 0.3em solid;
    border-right: 0.3em solid transparent;
    border-bottom: 0;
    border-left: 0.3em solid transparent;
    transition: transform var(--transition-base);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(240, 248, 242, 0.98));
    border: 1px solid rgba(124, 179, 66, 0.1);
    border-radius: var(--border-radius-md);
    box-shadow: var(--box-shadow-lg);
    list-style: none;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: var(--z-dropdown);
    margin-top: var(--spacing-sm);
}

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

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

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

.dropdown-item:first-child {
    border-radius: var(--border-radius-md) var(--border-radius-md) 0 0;
}

.dropdown-item:last-child {
    border-radius: 0 0 var(--border-radius-md) var(--border-radius-md);
}

.dropdown-item:hover {
    background: rgba(2, 136, 209, 0.1);
    color: var(--color-secondary-dark);
    padding-left: calc(var(--spacing-lg) + var(--spacing-md));
}

.dropdown-divider {
    height: 1px;
    background-color: var(--color-border);
    margin: var(--spacing-sm) 0;
}

/* ========== 汉堡菜单（移动端） ========== */
.navbar-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

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

.navbar-toggle.is-open .hamburger span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.navbar-toggle.is-open .hamburger span:nth-child(2) {
    opacity: 0;
}

.navbar-toggle.is-open .hamburger span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ========== 页面主体 ========== */
main {
    margin-top: 70px;
    min-height: calc(100vh - 70px);
}

/* ========== 页脚 ========== */
.footer {
    background: linear-gradient(160deg, #102418, #08263b);
    color: var(--color-white);
    padding: var(--spacing-4xl) var(--gutter) var(--spacing-2xl);
    margin-top: var(--spacing-4xl);
}

.footer-container {
    max-width: var(--max-width-container);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.footer-main {
    display: grid;
    grid-template-columns: 1.2fr 2fr;
    gap: var(--spacing-3xl);
    align-items: flex-start;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-logo {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: 4px;
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.8;
}

.footer-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-badge {
    padding: 4px 12px;
    border-radius: var(--border-radius-full);
    background: rgba(124, 179, 66, 0.2);
    font-size: 12px;
    letter-spacing: 2px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-2xl);
}

.footer-column h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    letter-spacing: 2px;
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-column a,
.footer-column li {
    color: rgba(255, 255, 255, 0.75);
    transition: color var(--transition-base);
    font-size: var(--font-size-sm);
}

.footer-column a:hover {
    color: var(--color-accent-light);
    text-decoration: none;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.75);
}

.footer-bottom a:hover {
    color: var(--color-accent-light);
}

.footer-bottom-links {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.footer-bottom-links span {
    color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 768px) {
    .footer {
        padding: var(--spacing-3xl) var(--gutter);
    }

    .footer-main {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}


/* ========== 面包屑导航 ========== */
.breadcrumb {
    display: flex;
    list-style: none;
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
}

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

.breadcrumb-item + .breadcrumb-item::before {
    display: inline-block;
    padding: 0 var(--spacing-sm);
    color: var(--color-text-tertiary);
    content: '/';
}

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

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

/* ========== 侧边栏 ========== */
.sidebar {
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
}

.sidebar-section {
    margin-bottom: var(--spacing-xl);
}

.sidebar-section:last-child {
    margin-bottom: 0;
}

.sidebar-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-heading);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-primary);
}

.sidebar-list {
    list-style: none;
}

.sidebar-item {
    margin-bottom: var(--spacing-sm);
}

.sidebar-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    border-left: 3px solid transparent;
    transition: all var(--transition-base);
}

.sidebar-link:hover,
.sidebar-link.active {
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    background-color: rgba(124, 179, 66, 0.12);
}

/* ========== 响应式导航 ========== */
@media (max-width: 768px) {
    .navbar-toggle {
        display: flex;
    }
    
    .navbar-menu {
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
        border-bottom: 1px solid rgba(124, 179, 66, 0.15);
    }
    
    .navbar-menu.active {
        max-height: 500px;
        box-shadow: var(--box-shadow-md);
        padding: var(--spacing-md) 0;
    }
    
    .navbar-item {
        width: 100%;
        border-bottom: 1px solid var(--color-border);
    }
    
    .navbar-link {
        padding: var(--spacing-md) var(--spacing-lg);
        border-radius: 0;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 0;
        visibility: hidden;
        max-height: 0;
        overflow: hidden;
        box-shadow: none;
        background-color: var(--color-bg-secondary);
        transform: none;
        margin-top: 0;
        border: none;
    }
    
    .dropdown.active .dropdown-menu {
        opacity: 1;
        visibility: visible;
        max-height: 500px;
        padding: var(--spacing-sm) 0;
    }

    .navbar-item.cta .navbar-link {
        margin: var(--spacing-md) var(--spacing-lg);
        border-radius: var(--border-radius-full);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .navbar-container {
        height: 60px;
    }
    
    .navbar-logo {
        font-size: var(--font-size-lg);
    }
    
    .navbar-logo img {
        height: 40px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .breadcrumb {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
}