/* assets/css/global.css (V3.0 - Final Responsive Fix) */

/* --- 1. 全局设计变量 --- */
:root {
    --bg-color: #121212;
    --card-color: #1e1e1e;
    --border-color: #2c2c2c;
    --text-primary: #e0e0e0;
    --text-secondary: #b3b3b3;
    --accent-primary: #bb86fc;
    --accent-primary-hover: #a56ef0;
    --accent-on-primary: #121212;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --hover-shadow-color: rgba(187, 134, 252, 0.3);
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Roboto, "Helvetica Neue", Arial, sans-serif;
    --card-border-radius: 8px;
}

/* --- 2. 基础元素重置与默认样式 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.7;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent-primary-hover);
    text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

/* --- 3. 通用布局与组件 (桌面端) --- */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.page-header {
    padding: 1.5rem 1rem;
    background-color: var(--card-color);
    border-bottom: 1px solid var(--border-color);
}

.main-content section {
    margin-bottom: 3rem;
}

.main-content h2 {
    font-size: 1.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-primary);
    display: inline-block;
}

.site-footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

.header-content-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    width: 100%;
}

.header-title {
    margin: 0;
    padding: 0 1rem;
    font-size: 1.8rem;
    text-align: center;
    flex-grow: 1;
}

.back-link {
    display: flex;
    align-items: center;
    padding: 0.4rem 0; /* 移除了左右padding */
    color: var(--text-secondary); /* 使用次要颜色，不那么突出 */
    font-size: 0.95em; /* 稍微调整字体大小以保持清晰 */
    font-weight: 500;
    text-decoration: none;
    white-space: nowrap;
    border: none; /* 移除边框 */
    background-color: transparent; /* 确保无背景色 */
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--accent-primary); /* 悬停时变为主题色 */
    text-decoration: underline; /* 添加下划线以示可点击 */
}
.back-link-placeholder {
    visibility: hidden;
    width: 70px;
}

.button-primary {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--card-border-radius);
    background-color: var(--accent-primary);
    color: var(--accent-on-primary);
    font-size: 1em;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
}

.button-primary:hover {
    background-color: var(--accent-primary-hover);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

/* --- 4. Markdown 专属样式 --- */
.container article img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.5rem auto;
    border-radius: var(--card-border-radius);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

blockquote {
    border-left: 4px solid var(--accent-primary);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    background-color: var(--card-color);
    border-radius: 0 var(--card-border-radius) var(--card-border-radius) 0;
}

blockquote p {
    margin: 0;
}

code {
    background-color: var(--border-color);
    color: var(--text-primary);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    font-size: 0.9em;
}

pre {
    background-color: var(--card-color);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: var(--card-border-radius);
    overflow-x: auto;
    font-size: 0.9em;
}

pre code {
    background-color: transparent;
    padding: 0;
}

ul, ol {
    padding-left: 2rem;
    margin: 1rem 0;
}

li {
    margin-bottom: 0.5rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    display: block;
    overflow-x: auto;
}

th, td {
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    text-align: left;
}

th {
    background-color: var(--card-color);
    font-weight: bold;
}

tr:nth-child(even) {
    background-color: var(--card-color);
}

hr {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

/* --- 5. [最终修正] 响应式设计 (当屏幕宽度 <= 768px 时生效) --- */
@media (max-width: 768px) {
    body {
        font-size: 16px;
        -webkit-text-size-adjust: 100%;
    }

    .container {
        margin-top: 1.5rem;
        margin-bottom: 1.5rem;
        padding: 0 1rem;
    }

    /* 移动端 Header 布局 */
    .page-header {
        padding: 0.75rem 0;
    }

    .header-content-wrapper {
        padding: 0 0.5rem;
        min-height: 48px;
    }

    .header-content-wrapper .back-link,
    .header-content-wrapper .icon-button {
        flex-shrink: 0;
    }

    .header-title {
        font-size: 1.1rem;
        font-weight: 600;
        text-align: center;
        margin: 0 0.5rem;

        /* --- 关键修复 --- */
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        min-width: 0; /* <--- 这就是解决问题的核心！ */
    }

    .back-link-placeholder {
        display: none;
    }

    .main-content h2 {
        font-size: 1.5rem;
    }

    .button-primary {
        padding: 0.8rem 1.2rem;
        font-size: 0.95em;
    }
}