/* ============================================================
   jiankan v2 — 极简白黑 Swiss 设计系统
   配色：纯白 + 墨黑 + 1px hairline + 柠檬黄点缀
   字体：Inter + PingFang SC + Microsoft YaHei
   排版：1280px 容器 / 8pt 栅格 / 大字号对比 / 大量留白
   ============================================================ */

/* ---------- 0. 设计令牌（CSS 变量） ---------- */
:root {
    /* 纸 */
    --jk-paper:       #ffffff;
    --jk-paper-2:     #fafafa;
    --jk-paper-3:     #f4f4f4;
    --jk-paper-4:     #ebebeb;

    /* 墨 */
    --jk-ink:         #0a0a0a;
    --jk-ink-2:       #1a1a1a;
    --jk-ink-3:       #4a4a4a;
    --jk-ink-4:       #8a8a8a;
    --jk-ink-5:       #b8b8b8;

    /* 线 */
    --jk-line:        #e8e8e8;
    --jk-line-2:      #d0d0d0;

    /* 强调 */
    --jk-accent:      #ffd60a;
    --jk-accent-ink:  #0a0a0a;
    --jk-success:     #00a86b;
    --jk-warn:        #ff6b35;

    /* 排版 */
    --jk-font-sans:   'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    --jk-font-mono:   'JetBrains Mono', 'SF Mono', 'Consolas', monospace;

    /* 间距（8pt） */
    --jk-s1: 4px;
    --jk-s2: 8px;
    --jk-s3: 16px;
    --jk-s4: 24px;
    --jk-s5: 32px;
    --jk-s6: 48px;
    --jk-s7: 64px;
    --jk-s8: 96px;
    --jk-s9: 128px;

    /* 容器 */
    --jk-container: 1280px;
    --jk-radius:    4px;

    /* 阅读器 */
    --jk-reader-w-1: 620px;
    --jk-reader-w-2: 720px;
    --jk-reader-w-3: 820px;
    --jk-reader-w-4: 920px;
}

/* ---------- 1. Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--jk-font-sans);
    font-size: 15px;
    line-height: 1.6;
    color: var(--jk-ink);
    background: var(--jk-paper);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color .15s ease, opacity .15s ease; }
a:hover { opacity: .65; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, h6, p { margin: 0; }
hr { border: 0; border-top: 1px solid var(--jk-line); margin: 0; }
::selection { background: var(--jk-accent); color: var(--jk-accent-ink); }

/* 通用容器 */
.jk-container { max-width: var(--jk-container); margin: 0 auto; padding: 0 var(--jk-s4); }
.jk-container--narrow { max-width: 980px; }
.jk-container--wide   { max-width: 1440px; }

/* 通用栅格 */
.jk-grid { display: grid; gap: var(--jk-s4); min-width: 0; }
.jk-grid > * { min-width: 0; }
.jk-row   { display: flex; flex-wrap: wrap; gap: var(--jk-s4); min-width: 0; }
.jk-row > * { min-width: 0; flex: 0 0 auto; }

/* 通用工具 */
.jk-mt-0{margin-top:0} .jk-mt-1{margin-top:var(--jk-s1)} .jk-mt-2{margin-top:var(--jk-s2)} .jk-mt-3{margin-top:var(--jk-s3)}
.jk-mt-4{margin-top:var(--jk-s4)} .jk-mt-5{margin-top:var(--jk-s5)} .jk-mt-6{margin-top:var(--jk-s6)} .jk-mt-7{margin-top:var(--jk-s7)}
.jk-mb-0{margin-bottom:0} .jk-mb-1{margin-bottom:var(--jk-s1)} .jk-mb-2{margin-bottom:var(--jk-s2)} .jk-mb-3{margin-bottom:var(--jk-s3)}
.jk-mb-4{margin-bottom:var(--jk-s4)} .jk-mb-5{margin-bottom:var(--jk-s5)} .jk-mb-6{margin-bottom:var(--jk-s6)} .jk-mb-7{margin-bottom:var(--jk-s7)}
.jk-flex { display: flex; }
.jk-flex-center { display: flex; align-items: center; justify-content: center; }
.jk-flex-between { display: flex; align-items: center; justify-content: space-between; }
.jk-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.jk-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.jk-clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.jk-clamp-4 { display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.jk-eyebrow { font-size: 12px; font-weight: 500; letter-spacing: .12em; text-transform: uppercase; color: var(--jk-ink-3); }
.jk-divider { height: 1px; background: var(--jk-line); border: 0; margin: var(--jk-s5) 0; }

/* ---------- 2. Header 顶栏 ---------- */
.jk-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(255,255,255,.92);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--jk-line);
}
.jk-header__inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px; gap: var(--jk-s5);
}
.jk-header__brand {
    font-size: 18px; font-weight: 700; letter-spacing: -0.01em;
    color: var(--jk-ink);
}
.jk-header__brand-dot {
    display: inline-block; width: 8px; height: 8px;
    background: var(--jk-accent); border-radius: 50%;
    margin-right: 6px; vertical-align: middle;
}
.jk-header__nav { display: flex; gap: var(--jk-s5); align-items: center; }
.jk-header__nav-link {
    font-size: 14px; font-weight: 500; color: var(--jk-ink-2);
    position: relative; padding: 4px 0;
}
.jk-header__nav-link:hover { color: var(--jk-ink); opacity: 1; }
.jk-header__nav-link.is-active::after {
    content: ''; position: absolute; left: 0; right: 0; bottom: -22px;
    height: 2px; background: var(--jk-ink);
}
.jk-header__actions { display: flex; align-items: center; gap: var(--jk-s3); }
.jk-header__search {
    width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
    border: 1px solid var(--jk-line); border-radius: 50%; transition: all .15s ease;
}
.jk-header__search:hover { border-color: var(--jk-ink); opacity: 1; }
.jk-header__search svg { width: 16px; height: 16px; stroke: var(--jk-ink); }

/* 移动端汉堡按钮 */
.jk-header__burger {
    display: none; width: 36px; height: 36px; align-items: center; justify-content: center;
}
.jk-header__burger span {
    display: block; width: 18px; height: 1.5px; background: var(--jk-ink);
    position: relative;
}
.jk-header__burger span::before, .jk-header__burger span::after {
    content: ''; position: absolute; left: 0; width: 18px; height: 1.5px; background: var(--jk-ink);
}
.jk-header__burger span::before { top: -6px; }
.jk-header__burger span::after  { top:  6px; }

/* 移动端抽屉 */
.jk-drawer {
    position: fixed; inset: 0; z-index: 200;
    background: var(--jk-paper);
    display: none; flex-direction: column;
    padding: var(--jk-s4);
}
.jk-drawer.is-open { display: flex; }
.jk-drawer__top { display: flex; justify-content: space-between; align-items: center; height: 56px; border-bottom: 1px solid var(--jk-line); }
.jk-drawer__close {
    width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
    font-size: 24px; color: var(--jk-ink);
}
.jk-drawer__nav { display: flex; flex-direction: column; padding: var(--jk-s4) 0; }
.jk-drawer__nav-link {
    font-size: 24px; font-weight: 600; color: var(--jk-ink);
    padding: var(--jk-s3) 0; border-bottom: 1px solid var(--jk-line);
}

/* ---------- 3. Footer 底栏 ---------- */
.jk-footer {
    border-top: 1px solid var(--jk-line);
    padding: var(--jk-s7) 0 var(--jk-s5);
    margin-top: var(--jk-s8);
    background: var(--jk-paper-2);
}
.jk-footer__brand {
    font-size: 48px; font-weight: 800; letter-spacing: -0.03em;
    line-height: 1; color: var(--jk-ink);
    margin-bottom: var(--jk-s3);
}
.jk-footer__brand-dot { color: var(--jk-accent); }
.jk-footer__desc { color: var(--jk-ink-3); max-width: 560px; margin-bottom: var(--jk-s5); }
.jk-footer__cols {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: var(--jk-s5);
    padding: var(--jk-s5) 0; border-top: 1px solid var(--jk-line);
}
.jk-footer__col h4 {
    font-size: 12px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase;
    color: var(--jk-ink-3); margin-bottom: var(--jk-s3);
}
.jk-footer__col li { padding: 4px 0; font-size: 14px; color: var(--jk-ink-2); }
.jk-footer__col li a:hover { color: var(--jk-ink); opacity: 1; }
.jk-footer__bottom {
    padding-top: var(--jk-s4); border-top: 1px solid var(--jk-line);
    display: flex; flex-wrap: wrap; gap: var(--jk-s3) var(--jk-s5);
    font-size: 13px; color: var(--jk-ink-4);
}
.jk-footer__bottom a { color: var(--jk-ink-3); }
.jk-footer__friend {
    display: flex; flex-wrap: wrap; gap: 4px var(--jk-s3);
    font-size: 13px; color: var(--jk-ink-3);
}
.jk-footer__friend strong { color: var(--jk-ink-2); font-weight: 500; margin-right: var(--jk-s2); }
.jk-footer__friend a { color: var(--jk-ink-3); }
.jk-footer__friend a:hover { color: var(--jk-ink); opacity: 1; }

/* ---------- 4. 通用文字样式 ---------- */
.jk-h-display {
    font-size: clamp(48px, 8vw, 88px);
    font-weight: 800; line-height: 1.02; letter-spacing: -0.04em;
    color: var(--jk-ink);
}
.jk-h-1 { font-size: 48px; font-weight: 800; line-height: 1.1; letter-spacing: -0.03em; }
.jk-h-2 { font-size: 32px; font-weight: 700; line-height: 1.15; letter-spacing: -0.02em; }
.jk-h-3 { font-size: 24px; font-weight: 700; line-height: 1.25; letter-spacing: -0.01em; }
.jk-h-4 { font-size: 18px; font-weight: 600; line-height: 1.3; }
.jk-h-5 { font-size: 15px; font-weight: 600; line-height: 1.4; }
.jk-text-meta { font-size: 13px; color: var(--jk-ink-3); }
.jk-text-meta-2 { font-size: 12px; color: var(--jk-ink-4); }
.jk-text-body  { font-size: 15px; color: var(--jk-ink-2); line-height: 1.7; }
.jk-text-body-lg { font-size: 17px; color: var(--jk-ink-2); line-height: 1.7; }

/* ---------- 5. Button ---------- */
.jk-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: var(--jk-s2);
    height: 44px; padding: 0 var(--jk-s4);
    font-size: 14px; font-weight: 600; letter-spacing: -0.005em;
    border: 1px solid var(--jk-ink); border-radius: var(--jk-radius);
    background: var(--jk-ink); color: var(--jk-paper);
    transition: all .15s ease; cursor: pointer;
    white-space: nowrap;
}
.jk-btn:hover { background: transparent; color: var(--jk-ink); opacity: 1; }
.jk-btn--accent { background: var(--jk-accent); border-color: var(--jk-accent); color: var(--jk-accent-ink); }
.jk-btn--accent:hover { background: transparent; color: var(--jk-ink); border-color: var(--jk-ink); }
.jk-btn--ghost { background: transparent; color: var(--jk-ink); }
.jk-btn--ghost:hover { background: var(--jk-ink); color: var(--jk-paper); }
.jk-btn--lg { height: 56px; padding: 0 var(--jk-s5); font-size: 15px; }
.jk-btn--sm { height: 32px; padding: 0 var(--jk-s3); font-size: 13px; }
.jk-btn--block { display: flex; width: 100%; }

/* ---------- 6. Tag / 标签 ---------- */
.jk-tag {
    display: inline-block; padding: 4px 10px;
    font-size: 12px; font-weight: 500; color: var(--jk-ink-2);
    border: 1px solid var(--jk-line-2); border-radius: 100px;
    transition: all .15s ease;
}
.jk-tag:hover { border-color: var(--jk-ink); color: var(--jk-ink); opacity: 1; }
.jk-tag--dark { background: var(--jk-ink); color: var(--jk-paper); border-color: var(--jk-ink); }
.jk-tag--accent { background: var(--jk-accent); color: var(--jk-accent-ink); border-color: var(--jk-accent); }

/* ---------- 7. Section 通用 ---------- */
.jk-section { padding: var(--jk-s7) 0; }
.jk-section--tight { padding: var(--jk-s6) 0; }
.jk-section__head {
    display: flex; align-items: flex-end; justify-content: space-between;
    gap: var(--jk-s4); margin-bottom: var(--jk-s5);
    padding-bottom: var(--jk-s3); border-bottom: 1px solid var(--jk-line);
}
.jk-section__title-wrap { min-width: 0; }
.jk-section__eyebrow { margin-bottom: var(--jk-s2); }
.jk-section__title { font-size: 28px; font-weight: 700; letter-spacing: -0.02em; }
.jk-section__title-num {
    display: inline-block; margin-right: var(--jk-s3);
    font-family: var(--jk-font-mono); font-size: 14px; font-weight: 400;
    color: var(--jk-ink-4); letter-spacing: 0;
}
.jk-section__more {
    font-size: 13px; font-weight: 500; color: var(--jk-ink-3);
    display: inline-flex; align-items: center; gap: 4px;
}
.jk-section__more::after { content: '\2192'; transition: transform .15s ease; }
.jk-section__more:hover { color: var(--jk-ink); opacity: 1; }
.jk-section__more:hover::after { transform: translateX(3px); }

/* ---------- 8. 首页 Hero ---------- */
.jk-hero {
    padding: var(--jk-s8) 0 var(--jk-s7);
    border-bottom: 1px solid var(--jk-line);
    position: relative;
}
.jk-hero__grid {
    display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--jk-s7);
    align-items: end;
}
.jk-hero__eyebrow { margin-bottom: var(--jk-s3); }
.jk-hero__title { margin-bottom: var(--jk-s4); }
.jk-hero__title em {
    font-style: normal; color: var(--jk-ink-3);
    background: linear-gradient(transparent 60%, var(--jk-accent) 60%);
    padding: 0 4px;
}
.jk-hero__lede {
    font-size: 18px; color: var(--jk-ink-3); line-height: 1.6;
    max-width: 560px; margin-bottom: var(--jk-s5);
}
.jk-hero__actions { display: flex; gap: var(--jk-s3); flex-wrap: wrap; }
.jk-hero__meta {
    display: flex; gap: var(--jk-s4); margin-top: var(--jk-s5);
    padding-top: var(--jk-s4); border-top: 1px solid var(--jk-line);
    color: var(--jk-ink-3); font-size: 13px;
}
.jk-hero__meta strong { display: block; color: var(--jk-ink); font-size: 28px; font-weight: 700; line-height: 1; margin-top: 4px; }
.jk-hero__featured {
    border: 1px solid var(--jk-line); padding: var(--jk-s4);
    background: var(--jk-paper-2);
}
.jk-hero__featured-eyebrow {
    display: inline-block; padding: 2px 8px; font-size: 11px; font-weight: 600;
    background: var(--jk-ink); color: var(--jk-paper); margin-bottom: var(--jk-s3);
    letter-spacing: .1em; text-transform: uppercase;
}
.jk-hero__featured-cover {
    aspect-ratio: 3/4; background: var(--jk-paper-3); overflow: hidden; margin-bottom: var(--jk-s3);
}
.jk-hero__featured-cover img { width: 100%; height: 100%; object-fit: cover; }
.jk-hero__featured-title { font-size: 22px; font-weight: 700; line-height: 1.2; margin-bottom: var(--jk-s2); }
.jk-hero__featured-author { font-size: 14px; color: var(--jk-ink-3); margin-bottom: var(--jk-s3); }
.jk-hero__featured-desc { font-size: 14px; color: var(--jk-ink-3); line-height: 1.6; }

/* ---------- 9. 书籍卡片 ---------- */
.jk-book-grid {
    display: grid; gap: var(--jk-s5);
    grid-template-columns: repeat(4, 1fr);
}
.jk-book-grid--3 { grid-template-columns: repeat(3, 1fr); }
.jk-book-grid--6 { grid-template-columns: repeat(6, 1fr); gap: var(--jk-s4); }

.jk-book-card { display: flex; flex-direction: column; gap: var(--jk-s3); }
.jk-book-card__cover {
    aspect-ratio: 3/4; background: var(--jk-paper-3); overflow: hidden; position: relative;
    transition: transform .3s ease;
}
.jk-book-card__cover:hover { transform: translateY(-4px); }
.jk-book-card__cover img { width: 100%; height: 100%; object-fit: cover; }
.jk-book-card__rank {
    position: absolute; top: 0; left: 0;
    font-family: var(--jk-font-mono); font-size: 48px; font-weight: 700; line-height: 1;
    color: var(--jk-paper); padding: var(--jk-s3) var(--jk-s3) var(--jk-s2);
    text-shadow: 0 2px 12px rgba(0,0,0,.5);
}
.jk-book-card__rank--dark { color: var(--jk-ink); text-shadow: none; }
.jk-book-card__title {
    font-size: 16px; font-weight: 600; line-height: 1.35;
    color: var(--jk-ink); margin-bottom: 4px;
}
.jk-book-card__author { font-size: 13px; color: var(--jk-ink-4); }
.jk-book-card__desc { font-size: 13px; color: var(--jk-ink-3); line-height: 1.6; margin-top: var(--jk-s2); }

/* 横排小卡（侧栏） */
.jk-book-mini { display: flex; gap: var(--jk-s3); padding: var(--jk-s3) 0; border-bottom: 1px solid var(--jk-line); }
.jk-book-mini:last-child { border-bottom: 0; }
.jk-book-mini__cover {
    flex: 0 0 60px; width: 60px; height: 80px; background: var(--jk-paper-3); overflow: hidden;
}
.jk-book-mini__cover img { width: 100%; height: 100%; object-fit: cover; }
.jk-book-mini__body { flex: 1; min-width: 0; }
.jk-book-mini__title { font-size: 14px; font-weight: 600; line-height: 1.4; margin-bottom: 4px; }
.jk-book-mini__author { font-size: 12px; color: var(--jk-ink-4); }

/* 文字列表（侧栏） */
.jk-text-list { display: flex; flex-direction: column; }
.jk-text-list__item {
    display: flex; justify-content: space-between; align-items: center; gap: var(--jk-s3);
    padding: var(--jk-s3) 0; border-bottom: 1px solid var(--jk-line);
    font-size: 14px;
}
.jk-text-list__item:last-child { border-bottom: 0; }
.jk-text-list__rank {
    flex: 0 0 24px; font-family: var(--jk-font-mono); font-size: 13px; color: var(--jk-ink-4);
    font-weight: 500;
}
.jk-text-list__item:nth-child(1) .jk-text-list__rank,
.jk-text-list__item:nth-child(2) .jk-text-list__rank,
.jk-text-list__item:nth-child(3) .jk-text-list__rank { color: var(--jk-ink); font-weight: 700; }
.jk-text-list__title { flex: 1; min-width: 0; color: var(--jk-ink-2); }
.jk-text-list__title:hover { color: var(--jk-ink); opacity: 1; }
.jk-text-list__time { flex: 0 0 auto; font-size: 12px; color: var(--jk-ink-4); font-family: var(--jk-font-mono); }

/* ---------- 10. 排行榜 ---------- */
.jk-ranking {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 0 var(--jk-s5);
    border-top: 1px solid var(--jk-line);
    padding-top: var(--jk-s3);
}
.jk-ranking__col { display: flex; flex-direction: column; }

/* ---------- 11. 分类 tab ---------- */
.jk-tabs { margin-bottom: var(--jk-s4); border-bottom: 1px solid var(--jk-line); }
.jk-tabs__list {
    display: flex; gap: var(--jk-s5); overflow-x: auto;
    scrollbar-width: none; -ms-overflow-style: none;
}
.jk-tabs__list::-webkit-scrollbar { display: none; }
.jk-tabs__btn {
    padding: var(--jk-s3) 0; font-size: 14px; font-weight: 500; color: var(--jk-ink-3);
    white-space: nowrap; position: relative; border-bottom: 2px solid transparent;
    margin-bottom: -1px; transition: all .15s ease;
}
.jk-tabs__btn:hover { color: var(--jk-ink); opacity: 1; }
.jk-tabs__btn.is-active { color: var(--jk-ink); border-bottom-color: var(--jk-ink); font-weight: 600; }
.jk-tabs__panel { display: none; }
.jk-tabs__panel.is-active { display: block; }

/* ---------- 12. Tag 列表 ---------- */
.jk-tag-cloud { display: flex; flex-wrap: wrap; gap: var(--jk-s2); }
.jk-tag-cloud .jk-tag { font-size: 13px; }

/* ---------- 13. 面包屑 ---------- */
.jk-crumb {
    display: flex; flex-wrap: wrap; align-items: center; gap: var(--jk-s2);
    font-size: 13px; color: var(--jk-ink-4); padding: var(--jk-s4) 0;
}
.jk-crumb a { color: var(--jk-ink-3); }
.jk-crumb a:hover { color: var(--jk-ink); opacity: 1; }
.jk-crumb__sep { color: var(--jk-ink-5); }
.jk-crumb__current { color: var(--jk-ink); font-weight: 500; }

/* ---------- 14. 详情页 (bookDetail) ---------- */

/* 头部顶部：封面 + 信息，cover 锁 3/4，info 用 space-between 撑到 cover 高 */

/* 简介 3 行截断 */

/* 展开按钮 */

/* 2 按钮并排 */

/* 标签 */

/* 章节列表 */
.jk-chapter-grid {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 0; border-top: 1px solid var(--jk-line);
    border-left: 1px solid var(--jk-line);
}
.jk-chapter-grid a {
    padding: var(--jk-s3) var(--jk-s2); font-size: 13px; color: var(--jk-ink-2);
    border-bottom: 1px solid var(--jk-line);
    border-right: 1px solid var(--jk-line);
    display: block;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.jk-chapter-grid a:hover { background: var(--jk-paper-2); color: var(--jk-ink); opacity: 1; }

/* 详情页内 section */
.jk-block { margin-bottom: var(--jk-s7); }
.jk-block__head {
    display: flex; align-items: baseline; justify-content: space-between;
    margin-bottom: var(--jk-s4); padding-bottom: var(--jk-s2); border-bottom: 1px solid var(--jk-line);
}
.jk-block__title { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }
.jk-block__title-num { color: var(--jk-ink-4); font-family: var(--jk-font-mono); font-size: 14px; font-weight: 400; margin-right: var(--jk-s2); }
.jk-block__more { font-size: 13px; color: var(--jk-ink-3); }

/* 侧栏模块 */

/* ---------- 15. 阅读页 (bookChapter) ---------- */
.jk-reader { padding: var(--jk-s5) 0 var(--jk-s9); background: var(--jk-paper); }
.jk-reader__head { text-align: center; margin-bottom: var(--jk-s6); padding-bottom: var(--jk-s4); border-bottom: 1px solid var(--jk-line); }
.jk-reader__book { font-size: 13px; color: var(--jk-ink-3); margin-bottom: var(--jk-s2); }
.jk-reader__book a { color: var(--jk-ink-3); }
.jk-reader__title { font-size: clamp(24px, 3vw, 32px); font-weight: 700; line-height: 1.3; letter-spacing: -0.01em; }
.jk-reader__meta { font-size: 12px; color: var(--jk-ink-4); margin-top: var(--jk-s2); }

.jk-reader__content {
    margin: 0 auto;
    max-width: var(--jk-reader-w-2);
    font-size: 17px; line-height: 1.85;
    color: var(--jk-ink-2);
}
.jk-reader__content p { margin-bottom: 1.2em; text-indent: 2em; }
.jk-reader__content h1, .jk-reader__content h2, .jk-reader__content h3 { text-indent: 0; margin: 1.5em 0 .8em; font-weight: 700; }
.jk-reader__content img { margin: 1em auto; max-width: 100%; }

/* 阅读页导航 */
.jk-reader__nav {
    margin: var(--jk-s6) auto 0; max-width: var(--jk-reader-w-2);
    display: flex; gap: var(--jk-s3);
    padding-top: var(--jk-s5); border-top: 1px solid var(--jk-line);
}
.jk-reader__nav .jk-btn { flex: 1; }

/* 阅读进度条 */
.jk-progress {
    position: fixed; left: 0; right: 0; bottom: 0; height: 3px;
    background: var(--jk-line); z-index: 50;
}
.jk-progress__bar {
    height: 100%; background: var(--jk-ink);
    width: 0%; transition: width .1s linear;
}

/* 浮动工具条 */
.jk-tb {
    position: fixed; right: var(--jk-s4); bottom: var(--jk-s5); z-index: 60;
    display: flex; flex-direction: column; gap: 6px;
    background: var(--jk-paper); border: 1px solid var(--jk-line);
    border-radius: 100px; padding: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,.06);
}
.jk-tb__btn {
    width: 36px; height: 36px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: var(--jk-ink-2); transition: all .15s ease;
    position: relative;
}
.jk-tb__btn:hover { background: var(--jk-ink); color: var(--jk-paper); }
.jk-tb__btn svg { width: 16px; height: 16px; }
.jk-tb__tip {
    position: absolute; right: 100%; top: 50%; transform: translateY(-50%);
    margin-right: var(--jk-s2);
    padding: 4px 10px; font-size: 12px; color: var(--jk-paper);
    background: var(--jk-ink); border-radius: 4px;
    white-space: nowrap; opacity: 0; pointer-events: none;
    transition: opacity .15s ease;
}
.jk-tb__btn:hover .jk-tb__tip { opacity: 1; }

/* 字号/主题弹窗 */
.jk-popup {
    position: fixed; right: var(--jk-s4); bottom: calc(var(--jk-s5) + 60px);
    z-index: 60; background: var(--jk-paper); border: 1px solid var(--jk-line);
    padding: var(--jk-s4); border-radius: 8px; min-width: 220px;
    box-shadow: 0 8px 24px rgba(0,0,0,.08);
    display: none;
}
.jk-popup.is-open { display: block; }
.jk-popup__title { font-size: 13px; font-weight: 600; color: var(--jk-ink-3); margin-bottom: var(--jk-s3); letter-spacing: .05em; text-transform: uppercase; }
.jk-popup__opts { display: flex; gap: 6px; margin-bottom: var(--jk-s3); }
.jk-popup__opt {
    flex: 1; height: 36px; display: flex; align-items: center; justify-content: center;
    border: 1px solid var(--jk-line); border-radius: 4px;
    font-size: 13px; color: var(--jk-ink-2); transition: all .15s ease;
}
.jk-popup__opt:hover { border-color: var(--jk-ink); color: var(--jk-ink); }
.jk-popup__opt.is-active { background: var(--jk-ink); border-color: var(--jk-ink); color: var(--jk-paper); }

/* 目录抽屉 */
.jk-toc {
    position: fixed; inset: 0; z-index: 150;
    background: var(--jk-paper);
    display: none; flex-direction: column;
}
.jk-toc.is-open { display: flex; }
.jk-toc__top { display: flex; align-items: center; justify-content: space-between; padding: var(--jk-s4); border-bottom: 1px solid var(--jk-line); }
.jk-toc__title { font-size: 16px; font-weight: 700; }
.jk-toc__close { width: 36px; height: 36px; font-size: 22px; }
.jk-toc__list { flex: 1; overflow-y: auto; padding: var(--jk-s2) 0; }
.jk-toc__item a {
    display: block; padding: var(--jk-s3) var(--jk-s4);
    font-size: 14px; color: var(--jk-ink-2);
    border-bottom: 1px solid var(--jk-line);
}
.jk-toc__item a:hover { background: var(--jk-paper-2); color: var(--jk-ink); opacity: 1; }
.jk-toc__item.is-current a { background: var(--jk-ink); color: var(--jk-paper); }

/* 阅读器主题 */
.jk-reader--dark { background: #0a0a0a; }
.jk-reader--dark .jk-reader__head { border-color: #2a2a2a; }
.jk-reader--dark .jk-reader__title { color: #ececec; }
.jk-reader--dark .jk-reader__book, .jk-reader--dark .jk-reader__book a, .jk-reader--dark .jk-reader__meta { color: #8a8a8a; }
.jk-reader--dark .jk-reader__content { color: #c0c0c0; }
.jk-reader--dark .jk-reader__nav { border-color: #2a2a2a; }
.jk-reader--dark .jk-tb { background: #1a1a1a; border-color: #2a2a2a; }
.jk-reader--dark .jk-tb__btn { color: #c0c0c0; }
.jk-reader--dark .jk-tb__btn:hover { background: var(--jk-accent); color: var(--jk-accent-ink); }
.jk-reader--dark .jk-popup { background: #1a1a1a; border-color: #2a2a2a; }
.jk-reader--dark .jk-popup__opt { border-color: #2a2a2a; color: #c0c0c0; }
.jk-reader--dark .jk-popup__opt.is-active { background: var(--jk-accent); border-color: var(--jk-accent); color: var(--jk-accent-ink); }
.jk-reader--dark .jk-progress { background: #2a2a2a; }
.jk-reader--dark .jk-progress__bar { background: var(--jk-accent); }
.jk-reader--dark .jk-toc { background: #0a0a0a; }
.jk-reader--dark .jk-toc__top { border-color: #2a2a2a; }
.jk-reader--dark .jk-toc__title { color: #ececec; }
.jk-reader--dark .jk-toc__item a { color: #c0c0c0; border-color: #1a1a1a; }
.jk-reader--dark .jk-toc__item a:hover { background: #1a1a1a; color: #ececec; }
.jk-reader--dark .jk-toc__item.is-current a { background: var(--jk-accent); color: var(--jk-accent-ink); }

.jk-reader--sepia { background: #f4ecd8; }
.jk-reader--sepia .jk-reader__content { color: #5b4636; }
.jk-reader--sepia .jk-reader__head { border-color: #d8c8a8; }
.jk-reader--sepia .jk-reader__title { color: #2c1810; }
.jk-reader--sepia .jk-reader__book, .jk-reader--sepia .jk-reader__book a, .jk-reader--sepia .jk-reader__meta { color: #8a7355; }
.jk-reader--sepia .jk-reader__nav { border-color: #d8c8a8; }

.jk-reader--gray { background: #ebebeb; }
.jk-reader--gray .jk-reader__content { color: #2a2a2a; }
.jk-reader--gray .jk-reader__head { border-color: #c8c8c8; }

/* 阅读页字号档 */
.jk-reader[data-size="1"] .jk-reader__content { font-size: 15px; max-width: var(--jk-reader-w-1); }
.jk-reader[data-size="2"] .jk-reader__content { font-size: 17px; max-width: var(--jk-reader-w-2); }
.jk-reader[data-size="3"] .jk-reader__content { font-size: 19px; max-width: var(--jk-reader-w-3); }
.jk-reader[data-size="4"] .jk-reader__content { font-size: 21px; max-width: var(--jk-reader-w-4); }
.jk-reader[data-line="1"] .jk-reader__content { line-height: 1.7; }
.jk-reader[data-line="2"] .jk-reader__content { line-height: 1.85; }
.jk-reader[data-line="3"] .jk-reader__content { line-height: 2.0; }

/* ---------- 16. 文章列表 (article) ---------- */
.jk-article-list { display: flex; flex-direction: column; }
.jk-article-item {
    display: grid; grid-template-columns: 200px 1fr;
    gap: var(--jk-s4); padding: var(--jk-s4) 0;
    border-bottom: 1px solid var(--jk-line);
}
.jk-article-item:last-child { border-bottom: 0; }
.jk-article-item__cover { aspect-ratio: 4/3; background: var(--jk-paper-3); overflow: hidden; }
.jk-article-item__cover img { width: 100%; height: 100%; object-fit: cover; }
.jk-article-item__body { min-width: 0; }
.jk-article-item__title { font-size: 20px; font-weight: 700; line-height: 1.3; margin-bottom: var(--jk-s2); }
.jk-article-item__title:hover { color: var(--jk-ink-3); opacity: 1; }
.jk-article-item__desc { font-size: 14px; color: var(--jk-ink-3); line-height: 1.6; margin-bottom: var(--jk-s3); }
.jk-article-item__meta { display: flex; gap: var(--jk-s3); font-size: 12px; color: var(--jk-ink-4); }

/* ---------- 17. 文章详情 ---------- */
.jk-article { padding: var(--jk-s6) 0; }
.jk-article__head { text-align: center; margin-bottom: var(--jk-s6); padding-bottom: var(--jk-s5); border-bottom: 1px solid var(--jk-line); }
.jk-article__title { font-size: clamp(28px, 4vw, 40px); font-weight: 800; line-height: 1.2; letter-spacing: -0.02em; margin-bottom: var(--jk-s3); }
.jk-article__meta { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--jk-s4); font-size: 13px; color: var(--jk-ink-3); }
.jk-article__body {
    max-width: 720px; margin: 0 auto;
    font-size: 16px; line-height: 1.85; color: var(--jk-ink-2);
}
.jk-article__body p { margin-bottom: 1.2em; }
.jk-article__body h1, .jk-article__body h2, .jk-article__body h3 { margin: 1.5em 0 .8em; font-weight: 700; }
.jk-article__body img { margin: 1.5em auto; }

/* ---------- 18. 搜索页 ---------- */
.jk-search-hero { padding: var(--jk-s7) 0 var(--jk-s5); text-align: center; }
.jk-search-form {
    display: flex; max-width: 640px; margin: 0 auto var(--jk-s3);
    border: 1px solid var(--jk-ink); border-radius: 0;
}
.jk-search-form__input {
    flex: 1; height: 56px; padding: 0 var(--jk-s4);
    border: 0; outline: 0; font-size: 16px;
    background: var(--jk-paper);
}
.jk-search-form__btn {
    width: 56px; background: var(--jk-ink); color: var(--jk-paper);
    display: flex; align-items: center; justify-content: center;
}
.jk-search-form__btn:hover { background: var(--jk-accent); color: var(--jk-accent-ink); }
.jk-search-form__btn svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 2; }
.jk-search-keywords {
    display: flex; flex-wrap: wrap; gap: var(--jk-s2); justify-content: center;
    max-width: 720px; margin: 0 auto;
}
.jk-search-keywords__item { font-size: 13px; color: var(--jk-ink-3); padding: 4px 10px; border: 1px solid var(--jk-line); border-radius: 100px; }
.jk-search-keywords__item:hover { color: var(--jk-ink); border-color: var(--jk-ink); opacity: 1; }

.jk-search-empty { text-align: center; padding: var(--jk-s7) 0; }
.jk-search-empty img { width: 80px; margin: 0 auto var(--jk-s3); opacity: .5; }
.jk-search-empty p { color: var(--jk-ink-3); }

/* ---------- 19. 分页 ---------- */
.jk-pagination {
    display: flex; flex-wrap: wrap; gap: 4px; justify-content: center;
    padding: var(--jk-s5) 0;
}
.jk-pagination a, .jk-pagination span {
    min-width: 36px; height: 36px; padding: 0 var(--jk-s2);
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 13px; color: var(--jk-ink-2);
    border: 1px solid var(--jk-line); border-radius: 4px;
}
.jk-pagination a:hover { border-color: var(--jk-ink); color: var(--jk-ink); opacity: 1; }
.jk-pagination .current { background: var(--jk-ink); border-color: var(--jk-ink); color: var(--jk-paper); }

/* ---------- 20. sitemap 列表 ---------- */
.jk-sitemap-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--jk-s3);
}
.jk-sitemap-grid a {
    display: block; padding: var(--jk-s3); font-size: 14px; color: var(--jk-ink-2);
    border: 1px solid var(--jk-line); border-radius: 4px;
    word-break: break-all;
}
.jk-sitemap-grid a:hover { border-color: var(--jk-ink); color: var(--jk-ink); opacity: 1; }

/* ---------- 21. 友链申请 ---------- */
.jk-form { display: flex; flex-direction: column; gap: var(--jk-s4); }
.jk-form__field { display: flex; flex-direction: column; gap: var(--jk-s2); }
.jk-form__label { font-size: 13px; font-weight: 500; color: var(--jk-ink-2); }
.jk-form__input, .jk-form__textarea {
    height: 44px; padding: 0 var(--jk-s3);
    border: 1px solid var(--jk-line-2); border-radius: 4px;
    background: var(--jk-paper); font-size: 14px;
    transition: border-color .15s ease;
}
.jk-form__textarea { height: auto; padding: var(--jk-s3); min-height: 100px; resize: vertical; }
.jk-form__input:focus, .jk-form__textarea:focus { border-color: var(--jk-ink); outline: 0; }

/* ---------- 22. 响应式 ---------- */
@media (max-width: 1200px) {
    .jk-book-grid { grid-template-columns: repeat(3, 1fr); }
    .jk-book-grid--6 { grid-template-columns: repeat(4, 1fr); }
    .jk-detail__body { grid-template-columns: 1fr 280px; gap: var(--jk-s5); }
}
@media (max-width: 992px) {
    .jk-header__nav { display: none; }
    .jk-header__burger { display: flex; }
    .jk-hero { padding: var(--jk-s6) 0 var(--jk-s5); }
    .jk-hero__grid { grid-template-columns: 1fr; gap: var(--jk-s5); }
    .jk-book-grid, .jk-book-grid--3 { grid-template-columns: repeat(2, 1fr); }
    .jk-book-grid--6 { grid-template-columns: repeat(3, 1fr); }
    .jk-detail__top { gap: var(--jk-s4); }
    .jk-detail__cover { width: 130px; }
    .jk-detail__body { grid-template-columns: 1fr; }
    .jk-detail__side { order: 2; }
    .jk-chapter-grid { grid-template-columns: repeat(3, 1fr); }
    .jk-article-item { grid-template-columns: 1fr; }
    .jk-article-item__cover { max-width: 100%; aspect-ratio: 16/9; }
    .jk-footer__cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
    body { font-size: 14px; }
    .jk-container { padding: 0 var(--jk-s3); }
    .jk-book-grid, .jk-book-grid--3 { grid-template-columns: repeat(2, 1fr); gap: var(--jk-s3); }
    .jk-book-grid--6 { grid-template-columns: repeat(2, 1fr); }
    .jk-hero { padding: var(--jk-s5) 0; }
    .jk-hero__meta { flex-wrap: wrap; gap: var(--jk-s3); }
    .jk-hero__meta strong { font-size: 22px; }
    .jk-section { padding: var(--jk-s5) 0; }
    .jk-section__head { flex-direction: column; align-items: flex-start; gap: var(--jk-s2); }
    .jk-section__title { font-size: 22px; }
    .jk-ranking { grid-template-columns: 1fr; gap: 0; }
    .jk-chapter-grid { grid-template-columns: repeat(2, 1fr); }
    .jk-footer { padding: var(--jk-s5) 0 var(--jk-s4); margin-top: var(--jk-s6); }
    .jk-footer__brand { font-size: 32px; }
    .jk-footer__cols { grid-template-columns: 1fr; gap: var(--jk-s4); padding: var(--jk-s4) 0; }
    .jk-tabs__list { gap: var(--jk-s4); }
    .jk-tb { right: var(--jk-s3); bottom: var(--jk-s4); }
    .jk-popup { right: var(--jk-s3); bottom: calc(var(--jk-s4) + 56px); }
    .jk-article__title, .jk-detail__title { font-size: 24px; }
    .jk-h-display { font-size: 40px; }
    .jk-search-form { max-width: 100%; }
}

/* ---------- 23. Hero 5 本轮播 ---------- */
.jk-hero__carousel {
    position: relative;
    border: 1px solid var(--jk-line);
    background: var(--jk-paper-2);
    aspect-ratio: 3/4;
    overflow: hidden;
}
.jk-hero__carousel-track { position: absolute; inset: 0; }
.jk-hero__carousel-slide {
    position: absolute; inset: 0;
    opacity: 0; visibility: hidden;
    transition: opacity .6s ease, visibility .6s ease;
}
.jk-hero__carousel-slide.is-active { opacity: 1; visibility: visible; }
.jk-hero__carousel-bg {
    position: absolute; inset: 0; z-index: 0;
    background-size: cover; background-position: center;
    filter: blur(30px) saturate(140%); transform: scale(1.15);
    opacity: .35;
}
.jk-hero__carousel-bg::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(to bottom, rgba(255,255,255,.4), rgba(255,255,255,.7));
}
.jk-hero__carousel-img {
    position: absolute; right: 8%; bottom: 0; height: 92%;
    z-index: 1; box-shadow: 0 12px 32px rgba(0,0,0,.18);
}
.jk-hero__carousel-content {
    position: absolute; left: 0; top: 0; bottom: 0; width: 62%;
    padding: var(--jk-s5); z-index: 2;
    display: flex; flex-direction: column; justify-content: flex-end;
    color: var(--jk-ink);
}
.jk-hero__carousel-num {
    font-family: var(--jk-font-mono); font-size: 13px; color: var(--jk-ink-4);
    letter-spacing: 0; margin-bottom: var(--jk-s2);
}
.jk-hero__carousel-eyebrow {
    display: inline-block; width: fit-content; padding: 2px 8px;
    font-size: 11px; font-weight: 600; background: var(--jk-ink); color: var(--jk-paper);
    margin-bottom: var(--jk-s2); letter-spacing: .1em; text-transform: uppercase;
}
.jk-hero__carousel-title {
    font-size: clamp(20px, 2.4vw, 32px); font-weight: 800; line-height: 1.15;
    letter-spacing: -0.02em; color: var(--jk-ink);
    margin-bottom: var(--jk-s2);
}
.jk-hero__carousel-author { font-size: 13px; color: var(--jk-ink-3); margin-bottom: var(--jk-s3); }
.jk-hero__carousel-desc {
    font-size: 13px; color: var(--jk-ink-3); line-height: 1.5;
    display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
    margin-bottom: var(--jk-s3);
}
.jk-hero__carousel-cta {
    display: inline-flex; align-items: center; gap: var(--jk-s2);
    font-size: 13px; font-weight: 600; color: var(--jk-ink);
    padding: 8px 14px; background: var(--jk-paper); border: 1px solid var(--jk-ink);
    width: fit-content;
    transition: all .15s ease;
}
.jk-hero__carousel-cta:hover { background: var(--jk-ink); color: var(--jk-paper); opacity: 1; }
.jk-hero__carousel-cta::after { content: '\2192'; transition: transform .15s ease; }
.jk-hero__carousel-cta:hover::after { transform: translateX(3px); }

/* 左右箭头 */
.jk-hero__carousel-arrow {
    position: absolute; top: 50%; transform: translateY(-50%);
    z-index: 3; width: 36px; height: 36px;
    background: var(--jk-paper); border: 1px solid var(--jk-line);
    display: flex; align-items: center; justify-content: center;
    color: var(--jk-ink); font-size: 16px;
    transition: all .15s ease;
}
.jk-hero__carousel-arrow:hover { background: var(--jk-ink); color: var(--jk-paper); border-color: var(--jk-ink); }
.jk-hero__carousel-arrow--prev { left: var(--jk-s2); }
.jk-hero__carousel-arrow--next { right: var(--jk-s2); }
.jk-hero__carousel-arrow svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 2; }

/* 圆点 */
.jk-hero__carousel-dots {
    position: absolute; bottom: var(--jk-s3); left: 0; right: 0;
    z-index: 3; display: flex; justify-content: center; gap: 6px;
}
.jk-hero__carousel-dot {
    width: 24px; height: 3px; background: var(--jk-ink-5);
    transition: background .15s ease;
}
.jk-hero__carousel-dot.is-active { background: var(--jk-ink); }
.jk-hero__carousel-dot:hover { background: var(--jk-ink-3); }

/* 进度条（5s） */
.jk-hero__carousel-progress {
    position: absolute; left: 0; bottom: 0; height: 2px;
    background: var(--jk-accent); z-index: 3;
    width: 0%;
}

/* ---------- 24. 编辑推荐（杂志风 2 行） ---------- */
.jk-editor {}
.jk-editor__row {
    display: grid; gap: var(--jk-s4);
    align-items: stretch;
}
.jk-editor__row--1 { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
.jk-editor__row--2 { grid-template-columns: 1fr 1fr 1fr 1.4fr; margin-top: var(--jk-s5); padding-top: var(--jk-s5); border-top: 1px solid var(--jk-line); position: relative; }
.jk-editor__row--2::before {
    content: '继续推荐';
    position: absolute; top: -10px; left: 50%; transform: translateX(-50%);
    background: var(--jk-paper); padding: 0 var(--jk-s3);
    font-size: 11px; font-weight: 500; color: var(--jk-ink-4);
    letter-spacing: .12em; text-transform: uppercase;
}

.jk-editor__card { display: flex; flex-direction: column; gap: var(--jk-s2); }
.jk-editor__card__cover {
    aspect-ratio: 3/4; background: var(--jk-paper-3); overflow: hidden; position: relative;
    transition: transform .3s ease;
}
.jk-editor__card__cover:hover { transform: translateY(-4px); }
.jk-editor__card__cover img { width: 100%; height: 100%; object-fit: cover; }
.jk-editor__card__num {
    position: absolute; top: var(--jk-s2); left: var(--jk-s2);
    font-family: var(--jk-font-mono); font-size: 11px; font-weight: 700;
    color: var(--jk-paper); padding: 2px 6px; background: var(--jk-ink);
}
.jk-editor__card__title { font-size: 15px; font-weight: 600; line-height: 1.35; }
.jk-editor__card__author { font-size: 12px; color: var(--jk-ink-4); }

/* 大图卡（rank 6 / rank 13） */
.jk-editor__big {}
.jk-editor__big__cover { aspect-ratio: 3/4; }
.jk-editor__big__title { font-size: 22px; font-weight: 800; line-height: 1.2; letter-spacing: -0.01em; margin-top: var(--jk-s3); }
.jk-editor__big__author { font-size: 13px; color: var(--jk-ink-3); margin-top: 4px; }
.jk-editor__big__desc {
    font-size: 13px; color: var(--jk-ink-3); line-height: 1.6;
    display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
    margin-top: var(--jk-s2);
}

@media (max-width: 992px) {
    .jk-editor__row--1, .jk-editor__row--2 { grid-template-columns: 1fr 1fr; }
    .jk-editor__big__title { font-size: 18px; }
    .jk-editor__row--2 { display: flex; flex-direction: column-reverse; }
    .jk-editor__row--2::before { display: none; }
    .jk-editor__row--2 { padding-top: var(--jk-s4); margin-top: var(--jk-s4); border-top: 1px dashed var(--jk-line); }
}
@media (max-width: 640px) {
    .jk-editor__row--1, .jk-editor__row--2 { grid-template-columns: 1fr; gap: var(--jk-s3); }
}

/* ---------- 25. 新书速递 18 本 6×3 ---------- */
.jk-newbooks {
    display: grid; grid-template-columns: repeat(6, 1fr);
    gap: var(--jk-s4);
}
.jk-newbook {
    display: flex; flex-direction: column; gap: var(--jk-s2);
}
.jk-newbook__cover {
    aspect-ratio: 3/4; background: var(--jk-paper-3); overflow: hidden;
    transition: transform .3s ease;
}
.jk-newbook__cover:hover { transform: translateY(-3px); }
.jk-newbook__cover img { width: 100%; height: 100%; object-fit: cover; }
.jk-newbook__title { font-size: 13px; font-weight: 600; line-height: 1.4; }
.jk-newbook__author { font-size: 11px; color: var(--jk-ink-4); }

@media (max-width: 1200px) { .jk-newbooks { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 768px)  { .jk-newbooks { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 480px)  { .jk-newbooks { grid-template-columns: repeat(2, 1fr); gap: var(--jk-s3); } }

/* ---------- 26. Hero 轮播移动端适配 ---------- */
@media (max-width: 992px) {
    .jk-hero__carousel { aspect-ratio: 4/3; }
    .jk-hero__carousel-img { right: 4%; height: 80%; }
    .jk-hero__carousel-content { width: 70%; padding: var(--jk-s4); }
    .jk-hero__carousel-title { font-size: 20px; }
}
@media (max-width: 640px) {
    .jk-hero__carousel { aspect-ratio: 1/1; }
    .jk-hero__carousel-img { right: 4%; bottom: 0; height: 50%; opacity: .9; transform: none; left: auto; }
    .jk-hero__carousel-content { width: 100%; padding: var(--jk-s4); justify-content: flex-end; background: linear-gradient(transparent 30%, rgba(255,255,255,.95) 70%); }
    .jk-hero__carousel-desc { display: none; }
    .jk-hero__carousel-arrow { width: 32px; height: 32px; }
    .jk-hero__carousel-title { font-size: 20px; }
    .jk-hero__carousel-cta { font-size: 12px; padding: 6px 10px; }
}

/* ---------- 27. Hero 轮播图缩小（v2.2） ---------- */
.jk-hero__carousel-img {
    right: 6%; bottom: 0; height: 70%;
}

/* ---------- 28. 编辑推荐 v2 4×2 统一网格（v2.2，已被 v3 取代，保留兼容）---------- */
.jk-editor-v2 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--jk-s4) var(--jk-s3);
}
.jk-editor-v2__card { display: flex; flex-direction: column; gap: var(--jk-s2); }
.jk-editor-v2__cover {
    aspect-ratio: 3/4; background: var(--jk-paper-3); overflow: hidden; position: relative;
    transition: transform .3s ease;
}
.jk-editor-v2__cover:hover { transform: translateY(-4px); }
.jk-editor-v2__cover img { width: 100%; height: 100%; object-fit: cover; }
.jk-editor-v2__num {
    position: absolute; left: 0; top: 0;
    font-family: var(--jk-font-mono); font-size: 10px; font-weight: 700;
    color: var(--jk-paper); padding: 4px 6px;
    background: var(--jk-ink); letter-spacing: 0;
}
.jk-editor-v2__title {
    font-size: 14px; font-weight: 600; line-height: 1.4;
    color: var(--jk-ink);
    margin-top: var(--jk-s2);
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.jk-editor-v2__author { font-size: 12px; color: var(--jk-ink-4); }
@media (max-width: 992px) { .jk-editor-v2 { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 640px) { .jk-editor-v2 { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 29. 分类书架 6×2 (v2.2) ---------- */
.jk-book-grid-6x2 {
    display: grid; grid-template-columns: repeat(6, 1fr);
    gap: var(--jk-s3);
}
@media (max-width: 1200px) { .jk-book-grid-6x2 { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 768px)  { .jk-book-grid-6x2 { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 480px)  { .jk-book-grid-6x2 { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 30. 分类区段 + 更多按钮（v2.2）---------- */
.jk-cat-section { margin-bottom: var(--jk-s6); }
.jk-cat-section:last-child { margin-bottom: 0; }
.jk-cat-section__more {
    display: inline-flex; align-items: center; gap: 4px;
    font-size: 12px; font-weight: 500; color: var(--jk-ink-3);
    padding: 4px 10px; border: 1px solid var(--jk-line);
    transition: all .15s ease;
}
.jk-cat-section__more:hover { border-color: var(--jk-ink); color: var(--jk-ink); opacity: 1; }
.jk-cat-section__more::after { content: '\2192'; transition: transform .15s ease; }
.jk-cat-section__more:hover::after { transform: translateX(3px); }

/* ---------- 31. 详情页简介 4 行（v2.2）---------- */

/* ---------- 32. 详情页精彩节选 8 行截断（v2.2）---------- */
.jk-detail__excerpt {
    font-size: 15px; line-height: 1.85; color: var(--jk-ink-2);
    max-height: 16em;
    overflow: hidden;
    position: relative;
    -webkit-mask-image: linear-gradient(to bottom, #000 70%, transparent 100%);
    mask-image: linear-gradient(to bottom, #000 70%, transparent 100%);
}
.jk-detail__excerpt::after {
    content: '';
    position: absolute; left: 0; right: 0; bottom: 0; height: 5em;
    background: linear-gradient(transparent, var(--jk-paper));
    pointer-events: none;
}
.jk-detail__excerpt.is-expanded {
    max-height: none;
    -webkit-mask-image: none;
    mask-image: none;
}
.jk-detail__excerpt::after { display: none; }

/* ---------- 33. 猜你喜欢 4 列 1 排（v2.2）---------- */
.jk-guess-row {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: var(--jk-s4);
}
@media (max-width: 768px) { .jk-guess-row { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 34. 阅读页 header/footer 适配（v2.2）---------- */
.jk-page--reader .jk-header {
    position: static;
    background: var(--jk-paper);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}
.jk-page--reader .jk-progress {
    z-index: 40;  /* 低于 header 50, 高于内容 */
}
.jk-page--reader .jk-footer {
    margin-top: var(--jk-s6);
    padding: var(--jk-s5) 0 var(--jk-s4);
}
.jk-page--reader .jk-reader { padding-top: var(--jk-s5); }

/* ---------- 35. 目录抽屉去滚动条（v2.2）---------- */
.jk-toc__list {
    overflow-y: auto;
    scrollbar-width: none;          /* Firefox */
    -ms-overflow-style: none;       /* IE 10+ */
}
.jk-toc__list::-webkit-scrollbar {  /* Chrome/Safari/Edge */
    display: none;
    width: 0;
    background: transparent;
}

/* ---------- 37. 编辑推荐 v3：2 横排 + 6 竖排 6×2 网格（v2.3）---------- */
.jk-editor-v3 {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    grid-auto-flow: dense;
    gap: var(--jk-s4);
}
.jk-editor-v3__card { display: flex; flex-direction: column; gap: var(--jk-s2); }
.jk-editor-v3__cover {
    aspect-ratio: 3/4; background: var(--jk-paper-3); overflow: hidden; position: relative;
    transition: transform .3s ease;
}
.jk-editor-v3__cover img { width: 100%; height: 100%; object-fit: cover; }
.jk-editor-v3__num {
    position: absolute; left: 0; top: 0;
    font-family: var(--jk-font-mono); font-size: 11px; font-weight: 700;
    color: var(--jk-paper); padding: 3px 7px;
    background: var(--jk-ink); letter-spacing: 0;
}
.jk-editor-v3__title {
    font-size: 14px; font-weight: 600; line-height: 1.4; color: var(--jk-ink);
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.jk-editor-v3__author { font-size: 12px; color: var(--jk-ink-4); }

/* 横排大卡（rank 6 / rank 13）跨 3 列 */
.jk-editor-v3__card.is-wide {
    grid-column: span 3;
    display: flex; flex-direction: row; align-items: stretch;
    background: var(--jk-paper-2); border: 1px solid var(--jk-line);
    padding: 0; gap: 0; overflow: hidden;
}
.jk-editor-v3__card.is-wide .jk-editor-v3__cover {
    flex: 0 0 50%; aspect-ratio: auto;
    transition: transform .3s ease;
}
.jk-editor-v3__card.is-wide:hover .jk-editor-v3__cover { transform: scale(1.03); }
.jk-editor-v3__card.is-wide.is-reverse { flex-direction: row-reverse; }
.jk-editor-v3__card.is-wide .jk-editor-v3__body {
    flex: 1; padding: var(--jk-s5);
    display: flex; flex-direction: column; justify-content: center; gap: var(--jk-s2);
}
.jk-editor-v3__card.is-wide .jk-editor-v3__title {
    font-size: 22px; font-weight: 800; line-height: 1.2; letter-spacing: -0.01em;
}
.jk-editor-v3__card.is-wide .jk-editor-v3__author { font-size: 13px; color: var(--jk-ink-3); }
.jk-editor-v3__card.is-wide .jk-editor-v3__desc {
    font-size: 13px; color: var(--jk-ink-3); line-height: 1.6;
    display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
    margin-top: var(--jk-s2);
}
.jk-editor-v3__card.is-wide .jk-editor-v3__eyebrow {
    font-size: 11px; font-weight: 600; color: var(--jk-paper);
    background: var(--jk-ink); padding: 2px 8px; letter-spacing: .1em;
    text-transform: uppercase; display: inline-block; width: fit-content;
}

@media (max-width: 992px) {
    .jk-editor-v3 { grid-template-columns: repeat(4, 1fr); }
    .jk-editor-v3__card.is-wide { grid-column: span 2; }
    .jk-editor-v3__card.is-wide .jk-editor-v3__title { font-size: 18px; }
}
@media (max-width: 640px) {
    .jk-editor-v3 { grid-template-columns: repeat(2, 1fr); }
    .jk-editor-v3__card.is-wide { grid-column: span 2; flex-direction: column; }
    .jk-editor-v3__card.is-wide.is-reverse { flex-direction: column; }
    .jk-editor-v3__card.is-wide .jk-editor-v3__cover { aspect-ratio: 16/9; flex: none; }
    .jk-editor-v3__card.is-wide .jk-editor-v3__body { padding: var(--jk-s3); }
    .jk-editor-v3__card.is-wide .jk-editor-v3__title { font-size: 16px; }
}

/* ---------- 38. 详情页（v2.5 清理）---------- */
/* 旧的 align-items: start / grid 规则已删除，head 改 flex */

/* ---------- 39. 详情页移动端 640px（v2.5）---------- */
@media (max-width: 640px) {
    .jk-detail__top { gap: var(--jk-s3); margin-bottom: var(--jk-s3); }
    .jk-detail__cover { width: 100px; }
    .jk-detail__title { font-size: 18px; }
    .jk-detail__author, .jk-detail__category, .jk-detail__time { font-size: 12px; }
    .jk-detail__desc { font-size: 13px; line-height: 1.6; }
    .jk-detail__excerpt-toggle { font-size: 12px; padding: 5px 12px; margin-bottom: var(--jk-s2); }
    .jk-detail__actions { gap: var(--jk-s2); margin-bottom: var(--jk-s3); }
    .jk-detail__actions .jk-btn { padding: 0 var(--jk-s3); font-size: 13px; }
}
/* 双 desc 切换：PC 端用 info 内的 desc，移动端用 top 外的 desc */

/* ============================================================
   详情页 v3.1 — 改回 jiankan 极简 Swiss 风格
   纯白底 + 1px hairline 分隔 + 大留白，不用 panel-box box
   ============================================================ */

/* ---------- 详情页整体 ---------- */
.jk-detail { padding: var(--jk-s6) 0; }

/* 详情页 row：主区 + 侧栏 2 列（不用 box） */
.jk-detail__row {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--jk-s7);
    align-items: flex-start;
}
.jk-detail__main { min-width: 0; }
.jk-detail__side { display: flex; flex-direction: column; gap: var(--jk-s6); }

@media (max-width: 992px) {
    .jk-detail__row { grid-template-columns: 1fr; }
    .jk-detail__side { order: 2; }
}

/* ---------- Head：cover + info（hairline 分隔，Swiss 极简）---------- */
.jk-detail__head {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: var(--jk-s6);
    padding-bottom: var(--jk-s6);
    border-bottom: 1px solid var(--jk-line);
    margin-bottom: var(--jk-s7);
}

.jk-detail__cover {
    aspect-ratio: 3/4;
    background: var(--jk-paper-3);
    overflow: hidden;
    border: 1px solid var(--jk-line);
    display: block;
}
.jk-detail__cover img {
    width: 100%; height: 100%;
    object-fit: cover;
    display: block;
}

.jk-detail__info {
    display: flex; flex-direction: column;
    gap: var(--jk-s3);
    min-width: 0;
}

.jk-detail__title {
    font-size: 40px;
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin: 0;
}

.jk-detail__meta {
    display: flex; flex-wrap: wrap;
    gap: var(--jk-s2) var(--jk-s4);
    color: var(--jk-ink-3);
    font-size: 14px;
}
.jk-detail__meta strong { color: var(--jk-ink); font-weight: 500; }

.jk-detail__desc {
    font-size: 15px;
    line-height: 1.7;
    color: var(--jk-ink-2);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.jk-detail__tags {
    display: flex; flex-wrap: wrap;
    gap: var(--jk-s2);
}

.jk-detail__actions {
    display: flex; gap: var(--jk-s3);
    margin-top: var(--jk-s3);
}
.jk-detail__actions .jk-btn { flex: 1; }

@media (max-width: 992px) {
    .jk-detail__head { grid-template-columns: 200px 1fr; }
    .jk-detail__title { font-size: 32px; }
}
@media (max-width: 640px) {
    .jk-detail__head {
        grid-template-columns: 100px 1fr;
        gap: var(--jk-s3);
        padding-bottom: var(--jk-s4);
    }
    .jk-detail__title { font-size: 20px; }
    .jk-detail__meta { font-size: 12px; }
    .jk-detail__desc { font-size: 13px; line-height: 1.6; }
    .jk-detail__actions .jk-btn { font-size: 13px; padding: 0 var(--jk-s2); }
}

/* ---------- 主区段（jiankan 风格：hairline 分隔，无 box）---------- */
.jk-block {
    margin-bottom: var(--jk-s7);
    padding-bottom: var(--jk-s4);
    border-bottom: 1px solid var(--jk-line);
}
.jk-block:last-child { border-bottom: 0; }
.jk-block__head {
    display: flex; align-items: baseline; justify-content: space-between;
    margin-bottom: var(--jk-s5);
    padding-bottom: var(--jk-s3);
    border-bottom: 1px solid var(--jk-line);
}
.jk-block__title {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0;
    display: flex; align-items: baseline; gap: var(--jk-s2);
}
.jk-block__title-num {
    font-family: var(--jk-font-mono);
    font-size: 13px;
    color: var(--jk-ink-4);
    font-weight: 400;
}
.jk-block__more {
    font-size: 12px;
    color: var(--jk-ink-4);
}
.jk-block__more:hover { color: var(--jk-ink); opacity: 1; }

/* ---------- 章节列表（4 列满 hairline）---------- */
.jk-chapter-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    border-top: 1px solid var(--jk-line);
    border-left: 1px solid var(--jk-line);
}
.jk-chapter-grid a {
    padding: var(--jk-s3) var(--jk-s2);
    font-size: 13px;
    color: var(--jk-ink-2);
    border-bottom: 1px solid var(--jk-line);
    border-right: 1px solid var(--jk-line);
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.jk-chapter-grid a:hover { background: var(--jk-paper-2); color: var(--jk-ink); opacity: 1; }

@media (max-width: 992px) {
    .jk-chapter-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
    .jk-chapter-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- 精彩节选 ---------- */
.jk-detail__excerpt {
    font-size: 15px;
    line-height: 1.85;
    color: var(--jk-ink-2);
    max-height: 12em;
    overflow: hidden;
    position: relative;
}
.jk-detail__excerpt::after {
    content: '';
    position: absolute; left: 0; right: 0; bottom: 0; height: 3em;
    background: linear-gradient(transparent, var(--jk-paper));
    pointer-events: none;
}
.jk-detail__excerpt.is-expanded { max-height: none; }
.jk-detail__excerpt.is-expanded::after { display: none; }
.jk-detail__excerpt-toggle {
    display: inline-block;
    margin-top: var(--jk-s3);
    font-size: 13px;
    color: var(--jk-ink-3);
    padding: 6px 14px;
    border: 1px solid var(--jk-line-2);
    border-radius: 4px;
    cursor: pointer;
    align-self: flex-start;
}
.jk-detail__excerpt-toggle:hover { border-color: var(--jk-ink); color: var(--jk-ink); }

/* ---------- 侧栏段（同主区段，hairline 分隔，无 box）---------- */
.jk-side-block {
    margin-bottom: var(--jk-s6);
    padding-bottom: var(--jk-s4);
    border-bottom: 1px solid var(--jk-line);
}
.jk-side-block:last-child { border-bottom: 0; }
.jk-side-block__head {
    display: flex; align-items: baseline; justify-content: space-between;
    margin-bottom: var(--jk-s4);
}
.jk-side-block__title {
    font-size: 14px;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.005em;
}
.jk-side-block__more {
    font-size: 11px;
    color: var(--jk-ink-4);
}
.jk-side-block__more:hover { color: var(--jk-ink); opacity: 1; }