/* ══════════════════════════════════════════
   知乎归档站 · Premium Dark UI
   ══════════════════════════════════════════ */

/* ── 设计令牌 ─────────────────────────────── */
:root {
    --bg: #070d18;
    --bg2: #0d1526;
    --bg3: #121d33;
    --bg4: #17243d;
    --border: #1e2d45;
    --border2: #253549;
    --accent: #3b82f6;
    --accent-g: linear-gradient(135deg, #3b82f6, #6366f1);
    --green: #10b981;
    --purple: #8b5cf6;
    --amber: #f59e0b;
    --red: #ef4444;
    --text: #e2e8f0;
    --text2: #94a3b8;
    --text3: #64748b;
    --author-c: #f472b6;
    /* MR Dang — pink */
    --author-y: #34d399;
    /* 黄彦臻 — emerald */
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, .4);
    --shadow: 0 4px 24px rgba(0, 0, 0, .6);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, .8);
    --trans: .2s cubic-bezier(.4, 0, .2, 1);
    --trans-fast: .12s ease;
}

/* ── 重置 ────────────────────────────────── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    font-size: 15px;
    line-height: 1.6;
    background-image:
        radial-gradient(ellipse 80% 40% at 50% -20%, rgba(59, 130, 246, .12) 0%, transparent 60%);
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ── 顶栏 ────────────────────────────────── */
.topbar {
    position: sticky;
    top: 0;
    z-index: 200;
    background: rgba(7, 13, 24, .8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
}

.topbar-inner {
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 14px 28px;
}

.logo {
    font-size: 18px;
    font-weight: 800;
    color: var(--text) !important;
    text-decoration: none !important;
    letter-spacing: -.02em;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.logo::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-g);
    box-shadow: 0 0 12px #3b82f6aa;
}

.search-wrap {
    flex: 1;
    max-width: 500px;
    display: flex;
    border: 1px solid var(--border2);
    border-radius: 10px;
    background: var(--bg2);
    transition: border-color var(--trans), box-shadow var(--trans);
    overflow: hidden;
}

.search-wrap:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, .15);
}

#search-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text);
    padding: 9px 14px;
    font-size: 14px;
    outline: none;
    font-family: inherit;
}

#search-input::placeholder {
    color: var(--text3);
}

#search-btn {
    background: transparent;
    border: none;
    color: var(--text3);
    padding: 0 14px;
    cursor: pointer;
    font-size: 15px;
    transition: color var(--trans-fast);
}

#search-btn:hover {
    color: var(--accent);
}

/* ── 布局 ────────────────────────────────── */
.layout {
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    gap: 28px;
    padding: 28px;
    align-items: flex-start;
}

/* ── 侧边栏 ──────────────────────────────── */
.sidebar {
    width: 230px;
    flex-shrink: 0;
    position: sticky;
    top: 72px;
}

.sidebar-section {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    margin-bottom: 14px;
}

.sidebar-title {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

/* 统计 */
.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 7px 0;
    border-bottom: 1px solid var(--border);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    font-size: 13px;
    color: var(--text2);
}

.stat-val {
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

/* 作者/筛选按钮 */
.author-btn,
.filter-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 9px 10px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    color: var(--text2);
    cursor: pointer;
    font-size: 13.5px;
    font-family: inherit;
    text-align: left;
    transition: all var(--trans);
    margin-bottom: 3px;
}

.author-btn:hover,
.filter-btn:hover {
    background: var(--bg3);
    color: var(--text);
}

.author-btn.active,
.filter-btn.active {
    background: var(--bg4);
    color: var(--text);
    font-weight: 600;
}

.cnt {
    margin-left: auto;
    font-size: 12px;
    color: var(--text3);
    font-variant-numeric: tabular-nums;
}

/* ── 主内容 ───────────────────────────────── */
.main {
    flex: 1;
    min-width: 0;
}

/* 文章卡片 */
.card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: all var(--trans);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, .04) 0%, transparent 60%);
    opacity: 0;
    transition: opacity var(--trans);
}

.card:hover {
    border-color: rgba(59, 130, 246, .5);
    background: var(--bg3);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.card:hover::before {
    opacity: 1;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

/* 标签 */
.tag {
    font-size: 10px;
    font-weight: 700;
    padding: 3px 9px;
    border-radius: 20px;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.tag.answer {
    background: rgba(16, 185, 129, .14);
    color: var(--green);
}

.tag.article {
    background: rgba(59, 130, 246, .14);
    color: var(--accent);
}

.author {
    font-size: 13px;
    font-weight: 600;
    color: var(--author-y);
}

.date {
    font-size: 12px;
    color: var(--text3);
    margin-left: auto;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--text);
    margin-bottom: 10px;
}

.card-footer {
    font-size: 12px;
    color: var(--text3);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ── 分页 ────────────────────────────────── */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    padding: 32px 0;
    flex-wrap: wrap;
}

.total {
    font-size: 13px;
    color: var(--text3);
    margin-right: 8px;
}

.pagination button {
    padding: 7px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border2);
    background: var(--bg2);
    color: var(--text2);
    cursor: pointer;
    font-size: 14px;
    font-family: inherit;
    transition: all var(--trans);
}

.pagination button:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(59, 130, 246, .08);
}

.pagination button:disabled {
    opacity: .3;
    cursor: not-allowed;
}

.pagination span {
    font-size: 13px;
    color: var(--text2);
    padding: 0 4px;
}

/* ── 详情页 ───────────────────────────────── */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--bg2);
    border: 1px solid var(--border2);
    color: var(--text2);
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-family: inherit;
    margin-bottom: 24px;
    transition: all var(--trans);
}

.back-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(59, 130, 246, .06);
}

.detail-header {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

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

.detail-title {
    font-size: 28px;
    font-weight: 800;
    line-height: 1.3;
    letter-spacing: -.02em;
    color: var(--text);
}

.src-link {
    font-size: 13px;
    color: var(--text3);
    transition: color var(--trans-fast);
}

.src-link:hover {
    color: var(--accent);
    text-decoration: none;
}

/* 正文 */
.detail-body {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px 36px;
    font-size: 16px;
    line-height: 1.85;
    color: var(--text);
    overflow-wrap: break-word;
    margin-bottom: 32px;
}

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

.detail-body h1,
.detail-body h2,
.detail-body h3,
.detail-body h4 {
    margin: 28px 0 12px;
    font-weight: 700;
    line-height: 1.3;
}

.detail-body h1 {
    font-size: 24px;
}

.detail-body h2 {
    font-size: 20px;
}

.detail-body h3 {
    font-size: 17px;
}

.detail-body img {
    max-width: 100%;
    border-radius: 8px;
    margin: 14px 0;
}

.detail-body blockquote {
    border-left: 3px solid var(--accent);
    margin: 18px 0;
    padding: 10px 18px;
    background: var(--bg3);
    border-radius: 0 8px 8px 0;
    color: var(--text2);
}

.detail-body pre,
.detail-body code {
    background: #0d1526;
    border-radius: 6px;
    font-size: 13.5px;
    font-family: 'JetBrains Mono', Consolas, monospace;
}

.detail-body pre {
    padding: 16px 18px;
    overflow-x: auto;
    margin: 14px 0;
    border: 1px solid var(--border);
}

.detail-body code {
    padding: 2px 7px;
}

.detail-body ul,
.detail-body ol {
    padding-left: 26px;
    margin-bottom: 16px;
}

.detail-body li {
    margin-bottom: 6px;
}

.detail-body hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 28px 0;
}

.detail-body a {
    color: var(--accent);
}

.detail-body figure {
    margin: 18px 0;
    text-align: center;
}

.detail-body figcaption {
    font-size: 12px;
    color: var(--text3);
    margin-top: 6px;
}

/* ── 评论区 ───────────────────────────────── */
.comment-section {
    margin-top: 8px;
}

.comment-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
}

.comment-title-num {
    font-size: 14px;
    color: var(--text3);
    font-weight: 400;
}

/* 根评论 */
.comment {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-bottom: 10px;
    transition: border-color var(--trans-fast);
}

.comment:hover {
    border-color: var(--border2);
}

/* 作者评论高亮 */
.author-comment {
    border-color: rgba(59, 130, 246, .35);
    background: linear-gradient(135deg, rgba(59, 130, 246, .06) 0%, var(--bg2) 60%);
}

.comment-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.comment-floor {
    font-size: 11px;
    color: var(--text3);
    font-weight: 600;
    min-width: 28px;
    text-align: center;
    background: var(--bg3);
    border-radius: 4px;
    padding: 2px 5px;
}

.comment-name {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 6px;
}

.author-badge {
    font-size: 10px;
    padding: 2px 7px;
    border-radius: 20px;
    background: rgba(59, 130, 246, .18);
    color: var(--accent);
    font-weight: 700;
    letter-spacing: .04em;
}

.comment-date {
    font-size: 12px;
    color: var(--text3);
    margin-left: auto;
}

.comment-body {
    font-size: 14.5px;
    line-height: 1.7;
    color: var(--text);
    word-break: break-word;
}

/* 楼中楼 */
.reply {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    padding: 10px 14px;
    background: var(--bg3);
    border-radius: var(--radius-sm);
    border-left: 2px solid var(--border2);
    font-size: 13.5px;
    line-height: 1.65;
    color: var(--text2);
    transition: border-color var(--trans-fast);
}

.reply:hover {
    border-left-color: var(--accent);
}

.reply-name {
    font-weight: 700;
    color: var(--text);
    white-space: nowrap;
    flex-shrink: 0;
}

/* ── 加载 / 空态 ─────────────────────────── */
.loading {
    text-align: center;
    padding: 80px 0;
    color: var(--text3);
    font-size: 14px;
}

.empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--text3);
    font-size: 15px;
}

.error {
    background: rgba(239, 68, 68, .1);
    border: 1px solid rgba(239, 68, 68, .3);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    color: #fca5a5;
    font-size: 14px;
}

/* ── 滚动条 ───────────────────────────────── */
::-webkit-scrollbar {
    width: 5px;
    height: 5px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border2);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #2d4062;
}

/* ── 响应式 ───────────────────────────────── */
@media (max-width: 960px) {
    .layout {
        flex-direction: column;
        padding: 16px;
        gap: 16px;
    }

    .sidebar {
        width: 100%;
        position: static;
    }

    .detail-body {
        padding: 20px;
        font-size: 15px;
    }

    .detail-title {
        font-size: 22px;
    }
}

@media (max-width: 480px) {
    .topbar-inner {
        padding: 10px 16px;
    }

    .layout {
        padding: 12px;
    }

    .card {
        padding: 16px;
    }

    .comment {
        padding: 14px 16px;
    }
}

/* ── 动画 ────────────────────────────────── */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card,
.comment {
    animation: fadeIn .25s ease both;
}

/* ── 侧边栏手风琴 ─────────────────────────── */
.author-accordion {
    margin-bottom: 2px;
}

.author-chevron {
    font-size: 10px;
    color: var(--text3);
    flex-shrink: 0;
}

.sb-article-list {
    max-height: 0;
    overflow: hidden;
    transition: max-height .4s cubic-bezier(.4, 0, .2, 1);
}

.sb-article-list.expanded {
    max-height: 3000px;
}

.sb-article-item {
    display: flex;
    align-items: flex-start;
    gap: 6px;
    padding: 6px 10px 6px 28px;
    border-radius: 6px;
    cursor: pointer;
    transition: background var(--trans-fast);
    color: var(--text2);
    font-size: 12.5px;
    line-height: 1.45;
}

.sb-article-item:hover {
    background: var(--bg4);
    color: var(--text);
}

.sb-tag {
    font-size: 9px;
    font-weight: 700;
    padding: 1px 5px;
    border-radius: 3px;
    flex-shrink: 0;
    margin-top: 3px;
    letter-spacing: .04em;
}

.sb-tag-ans {
    background: rgba(16, 185, 129, .15);
    color: var(--green);
}

.sb-tag-art {
    background: rgba(59, 130, 246, .15);
    color: var(--accent);
}

.sb-article-title {
    flex: 1;
}

/* ── 只看作者回复 按钮 ─────────────────────── */
.comment-title-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.comment-title-bar .comment-title {
    margin-bottom: 0;
}

.author-only-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border2);
    background: var(--bg3);
    color: var(--text2);
    font-size: 13px;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--trans);
    white-space: nowrap;
}

.author-only-btn:hover {
    border-color: var(--green);
    color: var(--green);
}

.author-only-btn.active {
    background: rgba(16, 185, 129, .15);
    border-color: var(--green);
    color: var(--green);
    font-weight: 600;
}

/* ══════════════════════════════════════════
   响应式 / 手机端适配
   ══════════════════════════════════════════ */

/* ── 平板（≤ 1024px）──  */
@media (max-width: 1024px) {
    .layout {
        gap: 18px;
        padding: 18px;
    }

    .sidebar {
        width: 200px;
    }
}

/* ── 手机（≤ 768px）── */
@media (max-width: 768px) {

    /* 顶栏 */
    .topbar {
        padding: 0 14px;
        height: 56px;
    }

    .logo {
        font-size: 16px;
    }

    #search-input {
        width: 120px;
        font-size: 13px;
    }

    /* 布局：侧边栏移到顶部，变为水平滚动条 */
    .layout {
        flex-direction: column;
        padding: 12px;
        gap: 12px;
    }

    .sidebar {
        width: 100%;
        position: static;
        /* 取消 sticky */
        display: flex;
        gap: 10px;
        overflow-x: auto;
        padding-bottom: 4px;
        -webkit-overflow-scrolling: touch;
    }

    /* 侧边栏各个卡片横向排列，固定宽度可滑动 */
    .sidebar-section {
        flex-shrink: 0;
        min-width: 180px;
        padding: 12px;
        margin-bottom: 0;
    }

    /* 作者手风琴在手机上禁用展开列表（太小了看不清） */
    .sb-article-list {
        display: none !important;
    }

    /* 卡片 */
    .card {
        padding: 14px 16px;
    }

    .card-title {
        font-size: 14px;
    }

    .card-footer {
        font-size: 12px;
    }

    /* 文章详情：占满宽度 */
    #detail-view {
        width: 100%;
    }

    .detail-header {
        padding: 16px 0 12px;
    }

    .detail-title {
        font-size: 18px;
        line-height: 1.4;
    }

    .detail-body {
        font-size: 14px;
        line-height: 1.8;
    }

    /* 评论区 */
    .comment {
        padding: 12px 14px;
    }

    .comment-title-bar {
        flex-direction: column;
        align-items: flex-start;
    }

    .author-only-btn {
        width: 100%;
        justify-content: center;
    }

    .reply {
        padding: 6px 10px 6px 12px;
        font-size: 12.5px;
    }

    /* 分页 */
    #pager {
        font-size: 13px;
        gap: 8px;
    }
}

/* ── 小屏手机（≤ 480px）── */
@media (max-width: 480px) {
    .topbar {
        padding: 0 10px;
    }

    #search-input {
        width: 90px;
    }

    .layout {
        padding: 8px;
        gap: 8px;
    }

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

    .detail-body {
        font-size: 13.5px;
    }

    .card {
        padding: 12px 14px;
        margin-bottom: 8px;
    }

    .sidebar-section {
        min-width: 160px;
        padding: 10px;
    }
}