/* ===== 全局重置与基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.company-name {
    color: white; /* 与导航栏背景色一致 */
    font-size: 1.5rem; /* 字体大小 */
    font-weight: 600; /* 加粗 */
    line-height: 1; /* 行高 */
    margin-left: 1rem; /* 与Logo间距 */
    margin-right: 20rem; /* 与汉堡按钮间距 */
    text-align: left; /* 文字左对齐 */
    transition: all 0.3s ease; /* 平滑过渡 */
}


/* ===== 加载动画 ===== */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.98);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    pointer-events: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #c00;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== 头部导航 ===== */
header.main-header {
    background: #c00;
    padding: 0 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

nav.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    height: 60px;
}

.brand-logo img {
    width: 100px;
    transition: transform 0.3s;
}

/* ===== 导航菜单 ===== */
.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    padding: 0.8rem 1rem;
    position: relative;
    transition: color 0.3s;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: #fff;
    transform: translateX(-50%);
    transition: width 0.3s;
}

.nav-link:hover::after {
    width: calc(100% - 2rem);
}

/* ===== 移动端导航 ===== */
/* 汉堡按钮整体样式 */
/* 汉堡按钮容器 */
.hamburger {
    position: fixed;
    right: 20px;
    top: 15px;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    z-index: 1002;
    cursor: pointer;
    outline: none;
    border-radius: 5px;
	display: none; /* 默认隐藏，由媒体查询控制显示 */
}

/* 汉堡横杠基础样式 */
.bar {
    display: block;
    width: 100%;
    height: 4px;
    background: #fff;
    border-radius: 4px;
    margin: 6px 0;
    transition: all 0.3s ease;
}

/* 动态效果增强 */
.hamburger.active .bar1 {
    transform: rotate(45deg) translate(6px, -6px);
}
.hamburger.active .bar2 {
    opacity: 0;
}
.hamburger.active .bar3 {
    transform: rotate(-45deg) translate(6px, 6px);
}


.hamburger-box {
    width: 30px;
    height: 24px;
    position: relative;
}

.hamburger-inner,
.hamburger-inner::before,
.hamburger-inner::after {
    content: '';
    width: 60%;
    height: 4px;
    background: #fff;
    position: absolute;
    transition: all 0.3s ease;
}

.hamburger-inner {
    top: 50%;
    transform: translateY(-50%);
}

.hamburger-inner::before {
    top: -8px;
}

.hamburger-inner::after {
    bottom: -8px;
}

/* 动态效果增强 */
.hamburger.active .inner-transform {
    transform: rotate(45deg);
}

.hamburger.active .inner-transform::before {
    transform: translate(0, 8px) rotate(-45deg);
}

.hamburger.active .inner-transform::after {
    transform: translate(0, -8px) rotate(45deg);
}
/* 新增过渡类 */
.inner-transform {
    transition: transform 0.3s ease;
}

/* PC端显示 */
@media (min-width: 769px) {
    .hamburger {
		display: none; /* 隐藏PC端按钮 */
        right: 30px;
        top: 20px;
    }
    .bar {
        height: 5px;
        margin: 8px 0;
    }
}

/* 新增平板横屏适配（769px ≤ width < 992px） */
@media (min-width: 769px) and (max-width: 991px) {
    .hamburger {
        display: none;
    }
    .main-nav .nav-menu {
        position: static; /* 强制显示导航栏 */
        flex-direction: row;
        background: transparent;
    }
	.company-name {
        display: none; /* 平板端隐藏公司名称 */
    }
}

/* 移动端显示 */
@media (max-width: 768px) {
    .hamburger {
        display: block;/* 移动端显示三条杠按钮 */
    }
	.bar {
        height: 4px;
        margin: 6px 0;
    }
    .company-name {
        display: none; /* 移动端隐藏公司名称 */
    }
    .nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        max-width: 60%; /* 新增：限制最大宽度 */
        width: 80%; /* 新增：初始宽度设为80% */
        height: 80vh; /* 修改：高度设为视窗的75% */
        max-height: 400px; /* 新增：最大高度限制 */
        overflow-y: auto; /* 新增：添加垂直滚动条 */
        background: rgba(192,0,0,0.98);
        flex-direction: column; /* 保持垂直排列 */
        padding: 1.5rem;
        transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
		  
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        font-size: 1.2rem;
        padding: 1rem 0.5rem;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

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