/* ==========================================================================
   导航页面样式表 | Navigation Page Stylesheet
   ========================================================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700&family=Rajdhani:wght@500;700&display=swap');

/* ==========================================================================
   1. 全局与根变量
   ========================================================================== */
/*
   页面的动态主题变量将由 script.js 根据配置注入到 :root 选择器中。
   例如：:root { --card-bg: rgba(...); --primary: #BB86FC; }
*/

/* --- 通用可访问性焦点样式 --- */
.icon-button:focus-visible,
#github-link:focus-visible,
#search-input:focus-visible,
.nav-card:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 3px;
    border-radius: 4px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-attachment: fixed;
    transition: color 0.3s ease, background-image 0.5s ease;
}

/* ==========================================================================
   2. 布局区域
   ========================================================================== */

/* --- 头部 --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    text-align: center;
    padding: 0.8rem 1rem;
    min-height: 50px;
    box-sizing: border-box;
    background-color: rgba(0, 0, 0, 0.05);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    z-index: 10;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* --- 顶部控制区域容器 --- */
.header-top-controls {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 3rem;
    box-sizing: border-box;
}

/* --- 行内标题区域 --- */
.site-header-inline {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-top: 0.5rem;
    color: var(--title-color);
    text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
}

/* --- 主体内容 --- */
main#content {
    flex-grow: 1;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

/* --- 底部 --- */
footer {
    width: 100%;
    padding: 0.1rem 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
    background-color: rgba(0,0,0,0.05);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

/* ==========================================================================
   3. 通用组件
   ========================================================================== */

/* --- 控制按钮与 GitHub 链接 --- */
.controls {
    display: flex;
    gap: 0.5rem;
}

.icon-button,
#github-link {
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.3s ease;
    color: var(--text-primary);
    background-color: var(--card-bg);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    text-decoration: none;
}

.icon-button:hover,
#github-link:hover {
    transform: scale(1.1);
    background-color: rgba(255, 255, 255, 0.15);
}

/* --- 时钟 --- */
#clock-widget {
    margin: 0;
    font-family: 'Orbitron', sans-serif;
    color: var(--primary);
    text-align: left;
    letter-spacing: 2px;
    text-shadow: 0 0 8px var(--primary);
}

.clock-time {
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1;
}

.clock-date-info {
    font-size: 0.8rem;
    opacity: 0.8;
    margin-top: 0.2rem;
    letter-spacing: 1px;
}

/* --- 站点标题 --- */
#site-title {
    font-size: 2.5rem;
    margin: 0;
    padding: 0;
    border: none;
}

#site-subtitle {
    font-size: 1.2rem;
    margin: 0;
    padding: 0;
    color: var(--subtitle-color);
    position: relative;
}

#site-subtitle::before {
    content: '';
    position: absolute;
    left: -10px;
    top: 50%;
    transform: translateY(-50%);
    height: 70%;
    width: 1.5px;
    background-color: var(--subtitle-color);
    opacity: 0.5;
}

/* --- 搜索框 --- */
.content-search-wrapper {
    width: calc(100% - 4rem); /* 保持与 nav-category 一致的 margin */
    margin-left: 2rem;
    display: flex;
    justify-content: center;
    margin-top: 2.5rem;
    margin-bottom: 2.5rem;
}

#search-input {
    width: 100%;
    max-width: 500px;
    padding: 15px 20px;
    font-size: 1rem;
    border-radius: 12px;
    color: var(--text-primary);
    text-align: center;
    outline: none;
    transition: all 0.3s ease;
    background-color: var(--card-bg);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    box-shadow: 0 8px 32px var(--shadow);
}

#search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb, 187, 134, 252), 0.4), 0 8px 32px var(--shadow);
    transform: scale(1.02);
}

/* --- 导航分类与卡片 --- */
.nav-category {
    margin-bottom: 2.5rem;
    margin-left: 2rem;
    width: calc(100% - 4rem);
}

.category-title {
    font-size: 1.5rem;
    color: var(--secondary);
    border-bottom: 2px solid var(--secondary);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.nav-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.nav-card {
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--card-bg);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    box-shadow: 0 8px 32px var(--shadow);
    cursor: pointer;
    will-change: transform, box-shadow;
}

.nav-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 40px var(--shadow);
}

.nav-card .iconify {
    font-size: 3rem;
    margin-bottom: 0.8rem;
    color: var(--primary);
    transition: transform 0.3s ease;
}

/* [已清理] 移除了无效的 Iconify 后备样式规则。*/

.nav-card:hover .iconify {
    transform: rotate(15deg) scale(1.1);
}

.nav-card .card-title {
    font-size: 1.2rem;
    font-weight: bold;
    margin: 0;
}

.nav-card .card-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* --- 搜索无结果提示 --- */
#no-results {
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-secondary);
    padding: 3rem 1rem;
}

/* ==========================================================================
   4. 响应式设计
   ========================================================================== */
@media (max-width: 768px) {
    /* --- 1. 修复 Header 布局 --- */
    .header-top-controls {
        /* 移动端保持绝对定位 */
        padding: 0.5rem 3rem;
        flex-shrink: 0;
    }

    .site-header-inline {
        display: inline;
        flex-grow: 1;
        text-align: left;
        margin-top: 0;
        margin-left: 1rem;
    }

    #site-subtitle::before {
        display: none;
    }

    /* --- 2. 调整字体大小 --- */
    #site-title {
        font-size: 1.8rem;
    }
    #site-subtitle {
        display: none;
    }

    /* --- 3. 隐藏时钟组件 --- */
    #clock-widget {
        opacity: 0;
    }

    /* --- 4. 调整控件大小 --- */
    .icon-button,
    #github-link {
        width: 38px;
        height: 38px;
    }

    /* --- 5. 其他响应式调整 --- */
    .nav-cards {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }
    
    /* [已清理] 修复并统一了 content-search-wrapper 的 margin 和 width */
    .content-search-wrapper {
        margin-top: 1rem;
        margin-bottom: 1rem;
        width: calc(100% - 4rem);
    }
}