/* ============================================
   导航栏样式 - 浙江宁轩建筑装饰工程有限公司
   ============================================ */

@import url('variables.css');

/* ===== 导航栏容器 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(248, 248, 255, 0.88);
    box-shadow: var(--box-shadow-sm);
    backdrop-filter: blur(18px);
    border-bottom: var(--border-width-thin) solid rgba(222, 214, 234, 0.6);
    z-index: var(--z-navbar);
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    padding: 0 var(--container-padding);
}

.navbar.scrolled {
    box-shadow: var(--box-shadow-md);
    background: rgba(248, 248, 255, 0.95);
}

/* ===== Logo 样式 ===== */
.navbar-brand {
    display: flex;
    align-items: center;
    margin-right: auto;
    text-decoration: none;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    transition: color var(--transition-normal);
    white-space: nowrap;
    letter-spacing: 0.02em;
}

.navbar-brand:hover {
    color: var(--color-accent);
}

.navbar-brand-name {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.02em;
}

/* ===== 导航菜单 ===== */
.navbar-menu {
    display: flex;
    list-style: none;
    gap: 0;
    margin: 0;
    padding: 0;
    align-items: center;
    flex-wrap: nowrap;
    white-space: nowrap;
}

.navbar-item {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.navbar-link {
    display: block;
    padding: 0 var(--spacing-lg);
    height: 100%;
    display: flex;
    align-items: center;
    color: var(--color-text-dark);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal);
    position: relative;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.navbar-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-primary-light) 100%);
    transition: width var(--transition-fast);
}

.navbar-link:hover {
    color: var(--color-accent);
}

.navbar-link:hover::after {
    width: 100%;
}

.navbar-item.active .navbar-link {
    color: var(--color-accent);
}

.navbar-item.active .navbar-link::after {
    width: 100%;
}

/* ===== 二级下拉菜单 ===== */
.navbar-submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.95) 0%, rgba(247, 233, 255, 0.9) 100%);
    list-style: none;
    margin: 0;
    padding: var(--spacing-sm) 0;
    min-width: 200px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--box-shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: var(--z-dropdown);
    border: var(--border-width-thin) solid rgba(222, 214, 234, 0.6);
}

.navbar-item:hover .navbar-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.navbar-submenu-item {
    margin: 0;
}

.navbar-submenu-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--color-text-dark);
    text-decoration: none;
    transition: all var(--transition-normal);
    border-left: 3px solid transparent;
}

.navbar-submenu-link:hover {
    background-color: var(--color-background);
    color: var(--color-accent);
    border-left-color: var(--color-accent);
    padding-left: calc(var(--spacing-lg) + 4px);
}

/* ===== 右侧操作按钮 ===== */
.navbar-actions {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    margin-left: var(--spacing-lg);
    flex-shrink: 0;
}

.navbar-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-primary-light) 100%);
    color: var(--color-white);
    border: none;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-block;
    box-shadow: var(--box-shadow-sm);
}

.navbar-btn:hover {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent-dark) 100%);
    box-shadow: var(--box-shadow-md);
}

/* ===== 汉堡菜单 (移动端) ===== */
.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    margin-left: var(--spacing-lg);
}

.navbar-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--color-primary);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-normal);
}

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

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

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

/* ===== 页面顶部边距 (为固定导航栏留出空间) ===== */
body {
    padding-top: var(--navbar-height);
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    body {
        padding-top: var(--navbar-height-mobile);
    }

    .navbar {
        height: var(--navbar-height-mobile);
        padding: 0 var(--spacing-sm);
    }

    .navbar-brand {
        margin-right: auto;
        white-space: normal;
        max-width: 220px;
    }

    .navbar-brand-name {
        font-size: var(--font-size-sm);
        line-height: 1.3;
    }

    .navbar-toggle {
        display: flex;
    }

    .navbar-menu {
        position: absolute;
        top: var(--navbar-height-mobile);
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-white);
        border-bottom: var(--border-width-thin) solid var(--border-color);
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-normal);
        white-space: normal;
    }

    .navbar-menu.active {
        max-height: 500px;
    }

    .navbar-item {
        width: 100%;
        height: auto;
        border-bottom: var(--border-width-thin) solid var(--border-color);
    }

    .navbar-link {
        width: 100%;
        padding: var(--spacing-md) var(--spacing-lg);
        height: auto;
        white-space: normal;
    }

    .navbar-link::after {
        display: none;
    }

    .navbar-submenu {
        position: static;
        opacity: 0;
        visibility: hidden;
        max-height: 0;
        overflow: hidden;
        transform: none;
        box-shadow: none;
        background-color: var(--color-background);
        transition: all var(--transition-normal);
    }

    .navbar-item.active .navbar-submenu,
    .navbar-item:hover .navbar-submenu {
        opacity: 1;
        visibility: visible;
        max-height: 500px;
    }

    .navbar-submenu-link {
        padding-left: var(--spacing-xl);
    }

    .navbar-submenu-link:hover {
        padding-left: calc(var(--spacing-xl) + 4px);
    }

    .navbar-actions {
        display: none;
    }

    .navbar-actions.active {
        display: flex;
        position: absolute;
        top: var(--navbar-height-mobile);
        right: 0;
        flex-direction: column;
        background-color: var(--color-white);
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        border-bottom: var(--border-width-thin) solid var(--border-color);
    }

    .navbar-btn {
        width: 100%;
        text-align: center;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .navbar-brand-name {
        font-size: var(--font-size-base);
    }

    .navbar-link {
        padding: 0 var(--spacing-md);
    }
}