/* public/css/header.css */

/* --- 1. 全局变量与基础设定 --- */
:root {
    --font-regular: 'NotoSansSC-Regular', sans-serif;
    --font-bold: 'NotoSansSC-Bold', sans-serif;
    --primary-text-color: #333;
    --brand-color: #007AFF;
    --header-height: 92px; /* 变更: 根据您的要求更新为 92px */
    --nav-breakpoint: 992px; /* 导航响应式断点 */
}

body.no-scroll {
    overflow: hidden;
}

.site-header {
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 2rem;
    box-sizing: border-box;
    /* 变更: 添加 transform 过渡，用于平滑地显示/隐藏 */
    transition: background-color 0.3s ease, box-shadow 0.3s ease, transform 0.4s ease-in-out;
}

/* 新增: 用于向上滑动隐藏页眉的样式 */
.site-header.is-hidden {
    transform: translateY(-100%);
}

/* 页面向下滚动时的样式 */
.site-header.is-scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.header-container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}


/* --- 2. Logo --- */
.logo-link {
    display: flex;
    align-items: center;
    position: relative;
    z-index: 2;
}

.logo-image {
    height: 55px; /* 您可以根据新的页眉高度适当调整此值 */
    width: auto;
    transition: transform 0.3s ease;
    filter: drop-shadow(0 0 8px rgba(0, 122, 255, 0));
    animation: breathing-glow 8s ease-in-out infinite;
}

.logo-link:hover .logo-image {
    transform: scale(1.05);
}

@keyframes breathing-glow {
    0%   { filter: drop-shadow(0 0 8px hsla(210, 100%, 50%, 0.5)); }
    25%  { filter: drop-shadow(0 0 12px hsla(120, 100%, 50%, 0.6)); }
    50%  { filter: drop-shadow(0 0 8px hsla(50, 100%, 50%, 0.5)); }
    75%  { filter: drop-shadow(0 0 12px hsla(0, 100%, 60%, 0.6)); }
    100% { filter: drop-shadow(0 0 8px hsla(210, 100%, 50%, 0.5)); }
}


/* --- 3. 桌面导航 --- */
.main-nav {
    display: flex;
}

.main-nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.main-nav a {
    font-family: var(--font-regular);
    text-decoration: none;
    color: var(--primary-text-color);
    font-size: 1rem;
    padding: 0.5rem 0.2rem;
    position: relative;
    transition: color 0.3s ease;
}

.main-nav a::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--brand-color);
    bottom: 0;
    left: 0;
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.4s cubic-bezier(0.19, 1, 0.22, 1);
}

.main-nav a:hover {
    color: var(--brand-color);
}

.main-nav a:hover::after {
    transform: scaleX(1);
}

.main-nav .current-page a {
    color: var(--brand-color);
    font-family: var(--font-bold);
}

.main-nav .current-page a::after {
    transform: scaleX(1);
}


/* --- 4. 移动端导航与汉堡按钮 --- */
.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    padding: 10px;
    cursor: pointer;
    z-index: 2;
}

.nav-toggle-bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--primary-text-color);
    border-radius: 3px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle-bar:not(:last-child) {
    margin-bottom: 5px;
}

.site-header.nav-open .nav-toggle-bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.site-header.nav-open .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}
.site-header.nav-open .nav-toggle-bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* --- 5. 响应式布局 --- */
@media (max-width: var(--nav-breakpoint)) {
    .nav-toggle {
        display: block;
    }
    .main-nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(5px);
        -webkit-backdrop-filter: blur(5px);
        display: flex;
        justify-content: center;
        align-items: center;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-20px);
        transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    }
    .site-header.nav-open .main-nav {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    .main-nav ul {
        flex-direction: column;
        gap: 2.5rem;
        text-align: center;
    }
    .main-nav a {
        font-size: 1.5rem;
    }
    .main-nav a:hover::after,
    .main-nav .current-page a::after {
        transform: scaleX(0);
    }
}