/* =====================================================
   Blog — 博客列表页 & 文章页公用样式
   依赖 style.css 提供 CSS 变量与基础样式
   ===================================================== */

/* ── 分类筛选栏 ─────────────────────────────────────── */
.blog-filter {
    background: var(--bg-parchment-dark);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
    position: sticky;
    top: 70px;
    z-index: 90;
}

.blog-filter__inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 4px;
    overflow-x: auto;
    scrollbar-width: none;
}

.blog-filter__inner::-webkit-scrollbar { display: none; }

.blog-filter__btn {
    flex-shrink: 0;
    padding: 14px 18px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-muted);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    transition: color 0.18s, border-color 0.18s;
    white-space: nowrap;
    font-family: var(--font-sans);
}

.blog-filter__btn:hover { color: var(--text-main); }

.blog-filter__btn.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
    font-weight: 600;
}

/* ── 文章列表区 ─────────────────────────────────────── */
.blog-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 48px 24px 80px;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

/* ── 文章卡片 ───────────────────────────────────────── */
.blog-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-parchment);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    transition: box-shadow 0.2s, transform 0.2s;
    text-decoration: none;
    color: inherit;
}

.blog-card:hover {
    box-shadow: 0 6px 24px rgba(0,0,0,0.09);
    transform: translateY(-3px);
}

/* 封面占位 / 图片 */
.blog-card__cover {
    width: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--bg-parchment-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.blog-card__cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.blog-card__cover-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    height: 100%;
    opacity: 0.35;
}

.blog-card__cover-placeholder i {
    font-size: 2rem;
    color: var(--accent-primary);
}

/* 卡片正文 */
.blog-card__body {
    padding: 22px 22px 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.blog-card__meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.blog-card__cat {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.3px;
}

/* 分类颜色 */
.blog-card__cat--tutorial {
    background: rgba(59, 90, 74, 0.12);
    color: var(--accent-primary);
    border: 1px solid rgba(59, 90, 74, 0.25);
}

.blog-card__cat--advanced {
    background: rgba(50, 80, 160, 0.1);
    color: #3250a0;
    border: 1px solid rgba(50, 80, 160, 0.2);
}

.blog-card__cat--explain {
    background: rgba(180, 110, 30, 0.1);
    color: #a06010;
    border: 1px solid rgba(180, 110, 30, 0.2);
}

.blog-card__cat--review {
    background: rgba(120, 50, 160, 0.1);
    color: #7832a0;
    border: 1px solid rgba(120, 50, 160, 0.2);
}

.blog-card__cat--news {
    background: rgba(160, 40, 40, 0.1);
    color: #a02828;
    border: 1px solid rgba(160, 40, 40, 0.2);
}

.blog-card__date {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.blog-card__title {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.5;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card__excerpt {
    font-size: 0.87rem;
    color: var(--text-muted);
    line-height: 1.75;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card__foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
}

.blog-card__tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.blog-card__tag {
    font-size: 0.72rem;
    color: var(--text-muted);
    background: var(--bg-parchment-dark);
    border-radius: 4px;
    padding: 2px 7px;
}

.blog-card__read {
    font-size: 0.78rem;
    color: var(--text-muted);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 5px;
    flex-shrink: 0;
}

/* ── 空状态 ─────────────────────────────────────────── */
.blog-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 80px 0;
    color: var(--text-muted);
}

.blog-empty i {
    font-size: 3rem;
    opacity: 0.3;
    margin-bottom: 16px;
}

.blog-empty p { font-size: 0.95rem; }

/* ── 统计行 ─────────────────────────────────────────── */
.blog-count {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.blog-count strong { color: var(--text-main); }

/* ── 文章详情页（article.html 公用）────────────────── */
.article-layout {
    max-width: 860px;
    margin: 0 auto;
    padding: 48px 24px 80px;
}

.article-header {
    margin-bottom: 36px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

.article-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 18px;
}

.article-breadcrumb a { color: var(--accent-primary); }
.article-breadcrumb i { font-size: 0.7rem; }

.article-cats {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.article-title {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.4;
    margin-bottom: 18px;
    letter-spacing: 0.5px;
}

.article-info {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.article-info i { margin-right: 4px; }

/* 文章正文内容 */
.article-body {
    font-size: 0.97rem;
    line-height: 1.9;
    color: var(--text-main);
}

.article-body h2 {
    font-family: var(--font-serif);
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 40px 0 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 28px 0 12px;
}

.article-body p { margin-bottom: 16px; }

.article-body ul,
.article-body ol {
    padding-left: 1.6em;
    margin-bottom: 16px;
}

.article-body li { margin-bottom: 8px; line-height: 1.75; }

.article-body code {
    font-family: 'Courier New', monospace;
    font-size: 0.88em;
    background: var(--bg-parchment-dark);
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.article-body pre {
    background: #1e1e1e;
    color: #d4d4d4;
    border-radius: 8px;
    padding: 20px 22px;
    overflow-x: auto;
    margin: 20px 0;
    font-size: 0.88rem;
    line-height: 1.7;
}

.article-body pre code {
    background: none;
    border: none;
    padding: 0;
    color: inherit;
    font-size: inherit;
}

.article-body blockquote {
    border-left: 3px solid var(--accent-primary);
    margin: 20px 0;
    padding: 14px 20px;
    background: rgba(59, 90, 74, 0.05);
    border-radius: 0 6px 6px 0;
    color: var(--text-muted);
    font-style: italic;
}

.article-body strong { color: var(--text-main); font-weight: 600; }

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

.article-body img {
    max-width: 100%;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: block;
    margin: 20px auto;
}

/* 文章提示框 */
.article-tip {
    display: flex;
    gap: 14px;
    padding: 16px 20px;
    border-radius: 8px;
    margin: 20px 0;
    font-size: 0.92rem;
    line-height: 1.75;
}

.article-tip i { font-size: 1rem; flex-shrink: 0; margin-top: 2px; }

.article-tip--info {
    background: rgba(59, 90, 74, 0.06);
    border: 1px solid rgba(59, 90, 74, 0.2);
    color: var(--text-muted);
}

.article-tip--info i { color: var(--accent-primary); }

.article-tip--warn {
    background: rgba(200, 130, 50, 0.07);
    border: 1px solid rgba(200, 130, 50, 0.28);
    color: #7a5a2e;
}

.article-tip--warn i { color: #c88232; }

/* 文章底部导航 */
.article-nav {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-top: 52px;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.article-nav__link {
    display: flex;
    flex-direction: column;
    gap: 6px;
    text-decoration: none;
    padding: 16px 20px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    flex: 1;
    min-width: 220px;
    transition: border-color 0.18s, background 0.18s;
    background: var(--bg-parchment);
}

.article-nav__link:hover {
    background: var(--bg-parchment-dark);
    border-color: var(--accent-primary);
}

.article-nav__link--next { text-align: right; }

.article-nav__label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.article-nav__title {
    font-size: 0.92rem;
    color: var(--text-main);
    font-weight: 500;
    line-height: 1.4;
}

.article-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 40px;
    font-size: 0.88rem;
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
}

.article-back-btn:hover { text-decoration: underline; }

/* ── 文章底部下载引导卡片 ───────────────────────────── */
.article-dl-card {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    margin-top: 52px;
    padding: 28px 32px;
    background: linear-gradient(135deg, rgba(59,90,74,0.07) 0%, rgba(59,90,74,0.03) 100%);
    border: 1px solid rgba(59, 90, 74, 0.22);
    border-radius: 12px;
}

.article-dl-card__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.article-dl-card__icon img {
    width: 54px;
    height: 54px;
    object-fit: contain;
}

.article-dl-card__body { flex: 1; }

.article-dl-card__body h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 0 0 8px;
}

.article-dl-card__body p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin: 0 0 18px;
}

.article-dl-card__btns {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ── 右下角浮动下载引导 ──────────────────────────────── */
.dl-float {
    position: fixed;
    bottom: 32px;
    right: 28px;
    z-index: 200;
    display: grid;
    grid-template-columns: 40px 1fr;
    grid-template-rows: auto auto;
    gap: 10px 14px;
    align-items: center;
    padding: 16px 18px 14px 16px;
    background: var(--bg-parchment);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.14);
    width: 240px;
    opacity: 0;
    transform: translateY(16px);
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
}

.dl-float--visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.dl-float__close {
    position: absolute;
    top: 8px;
    right: 10px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 2px 4px;
    line-height: 1;
    transition: color 0.15s;
}

.dl-float__close:hover { color: var(--text-main); }

.dl-float__icon {
    grid-column: 1;
    grid-row: 1;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1rem;
}

.dl-float__text {
    grid-column: 2;
    grid-row: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.dl-float__text strong {
    font-size: 0.88rem;
    color: var(--text-main);
    font-weight: 600;
}

.dl-float__text span {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.dl-float__btn {
    grid-column: 1 / -1;
    grid-row: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--accent-primary);
    color: #fff;
    border-radius: 7px;
    font-size: 0.82rem;
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.15s;
}

.dl-float__btn:hover { opacity: 0.88; }

/* ── 响应式 ─────────────────────────────────────────── */
@media (max-width: 960px) {
    .blog-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .blog-filter__btn { padding: 12px 14px; font-size: 0.83rem; }

    /* 卡片底部：标签与阅读时间纵向排列 */
    .blog-card__foot { flex-direction: column; align-items: flex-start; gap: 8px; }
    .blog-card__read { white-space: normal; }

    .article-title { font-size: 1.6rem; }
    .article-info { gap: 12px; font-size: 0.82rem; }

    .article-body pre { padding: 14px 12px; font-size: 0.82rem; }
    .article-body h2 { font-size: 1.25rem; }
    .article-body h3 { font-size: 1.05rem; }

    .article-dl-card {
        flex-direction: column;
        gap: 16px;
        padding: 20px;
    }

    .article-dl-card__btns { flex-direction: column; }
    .article-dl-card__btns .btn { width: 100%; justify-content: center; }

    /* 文章底部导航 */
    .article-nav { flex-direction: column; }
    .article-nav__link { min-width: unset; }
}

@media (max-width: 600px) {
    .blog-grid { grid-template-columns: 1fr; gap: 16px; }
    .blog-main { padding: 24px 14px 56px; }
    .article-layout { padding: 24px 14px 56px; }
    .article-title { font-size: 1.35rem; }

    .dl-float {
        bottom: 0;
        right: 0;
        left: 0;
        border-radius: 12px 12px 0 0;
        max-width: unset;
        border-bottom: none;
    }
}