/* ==========================================
 * 全自适应响应式个人博客样式表
 * 支持：PC大屏 / 平板 / 手机端无缝自适应
 * ========================================== */

:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-sub: #64748b;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 12px;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-sub: #94a3b8;
    --primary: #60a5fa;
    --primary-hover: #3b82f6;
    --border-color: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s, transform 0.2s, box-shadow 0.2s;
}

html, body {
    width: 100%;
    overflow-x: hidden; /* 彻底防止手机端出现横向滚动条 */
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.7;
    -webkit-tap-highlight-color: transparent;
}

/* 顶部导航栏自适应 */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    width: 100%;
}
[data-theme="dark"] header {
    background-color: rgba(30, 41, 59, 0.88);
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap; /* 支持手机端换行 */
    gap: 10px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-main);
}

.brand-logo {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: white;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 17px;
    flex-shrink: 0;
}

.brand-title {
    font-size: 18px;
    font-weight: 700;
    white-space: nowrap;
}

.nav-right-box {
    display: flex;
    gap: 15px;
    align-items: center;
}

.main-nav {
    display: flex;
    gap: 15px;
    align-items: center;
}

.main-nav a {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 5px;
    white-space: nowrap;
}

.theme-toggle {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 5px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 页面主容器自适应 */
.page-container {
    max-width: 900px;
    width: 100%;
    margin: 25px auto;
    padding: 0 16px; /* 手机端保留安全留白 */
}

/* 卡片容器 */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    width: 100%;
}

/* 分类 Tab 按钮组 (手机端滑动或自适应换行) */
.category-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
    width: 100%;
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    padding: 0 16px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-sub);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none !important;
    cursor: pointer;
    white-space: nowrap;
}

.tab-btn.active {
    background: var(--primary) !important;
    color: #ffffff !important;
    border-color: var(--primary) !important;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
}

/* 文章卡片 */
.article-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    width: 100%;
}

.article-tag {
    display: inline-block;
    font-size: 12px;
    padding: 2px 8px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
    border-radius: 6px;
    margin-bottom: 8px;
    font-weight: 600;
}

.article-card h2 {
    font-size: 18px;
    margin-bottom: 8px;
    line-height: 1.4;
    word-break: break-word; /* 避免手机端长标题撑破网页 */
}

.article-card h2 a {
    color: var(--text-main);
    text-decoration: none;
}

.article-meta {
    font-size: 12px;
    color: var(--text-sub);
    margin-bottom: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.article-summary {
    color: var(--text-sub);
    font-size: 13.5px;
    margin-bottom: 12px;
    word-break: break-word;
}

.read-more {
    color: var(--primary);
    font-size: 13.5px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* 作品推荐全自适应网格 */
.works-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 16px;
    width: 100%;
}

.work-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* 个人信息名片 */
.profile-card {
    text-align: center;
    padding: 25px 20px;
}

.avatar {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3b82f6, #06b6d4);
    color: white;
    font-size: 28px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
}

/* 留言板表单 */
.comment-form input, .comment-form textarea {
    width: 100%;
    padding: 10px 12px;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-main);
    border-radius: 8px;
    font-size: 13.5px;
    outline: none;
}

.comment-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    width: 100%;
}

/* 页脚自适应 */
footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 25px 16px;
    text-align: center;
    font-size: 12.5px;
    color: var(--text-sub);
    margin-top: 40px;
    width: 100%;
}

/* ==========================================
 * 📱 移动端媒体查询调整 (屏幕宽度 < 768px)
 * ========================================== */
@media (max-width: 768px) {
    .nav-container {
        padding: 10px 14px;
    }

    .brand-title {
        font-size: 16px;
    }

    .main-nav {
        gap: 10px;
    }

    .main-nav a {
        font-size: 13px;
        gap: 3px;
    }

    .theme-toggle span {
        display: none; /* 手机端隐藏文字，只留图标 */
    }

    .page-container {
        margin: 15px auto;
        padding: 0 12px;
    }

    .card {
        padding: 18px 14px;
    }

    .article-card h2 {
        font-size: 16.5px;
    }

    .works-grid {
        grid-template-columns: 1fr; /* 手机端单列展示 */
    }
}

/* 📱 极小屏幕微调 (屏幕宽度 < 480px) */
@media (max-width: 480px) {
    .nav-container {
        flex-direction: row;
        justify-content: space-between;
    }

    .main-nav {
        overflow-x: auto; /* 菜单过多时可左右滑动 */
        max-width: 100%;
        padding-bottom: 2px;
    }
    
    .category-tabs {
        overflow-x: auto;
        flex-wrap: nowrap; /* 分类标签支持水平拖动 */
        padding-bottom: 5px;
    }

    .tab-btn {
        flex-shrink: 0;
        height: 32px;
        font-size: 12px;
        padding: 0 12px;
    }
}