/* library-shelf · 书架 —— 橡木层板、彩色书脊边、借阅日期戳贯穿全站 */
:root {
    --ls-wall: #f6ecee;
    --ls-shelf: #9c6237;
    --ls-shelf-dark: #6f4223;
    --ls-page: #ffffff;
    --ls-ink: #2a1f2d;
    --ls-soft: #5d5060;
    --ls-accent: #11698e;
    --ls-slip: #fff7d6;
    --ls-line: #e6d6da;
    --ls-display: "Josefin Sans", "Futura", system-ui, sans-serif;
    --ls-body: "Source Sans 3", system-ui, -apple-system, "Segoe UI", sans-serif;
    --pagination-accent: #11698e;
}

body.theme-shelf { margin: 0; background: var(--ls-wall); color: var(--ls-ink); font-family: var(--ls-body); font-size: 17px; }
:where(.theme-shelf) a { color: inherit; text-decoration: none; }
.theme-shelf :focus-visible { outline: 3px solid var(--ls-accent); outline-offset: 3px; }
.ls-skip { position: absolute; left: -9999px; }
.ls-skip:focus { left: 12px; top: 12px; z-index: 50; padding: 10px 14px; background: var(--ls-slip); font-weight: 600; }
.ls-stacks:focus { outline: none; }
.ls-library { min-height: 100vh; }

/* ---------- 母题：书脊色、层板、日期戳 ---------- */
.ls-spine-0 { --ls-spine: #11698e; }
.ls-spine-1 { --ls-spine: #b23a48; }
.ls-spine-2 { --ls-spine: #2f7a4d; }
.ls-spine-3 { --ls-spine: #6a4c93; }
.ls-spine-4 { --ls-spine: #c26b16; }
.ls-book-mark { display: inline-block; justify-self: start; padding: 2px 8px; border: 1px solid var(--ls-spine, var(--ls-accent)); color: var(--ls-spine, var(--ls-accent)); font-family: var(--ls-display); font-weight: 600; font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; }
.ls-stamp { display: inline-block; padding: 1px 8px; border: 2px solid #8a2a3a; border-radius: 4px; color: #8a2a3a; font-family: var(--ls-display); font-weight: 700; font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; transform: rotate(-2deg); }

/* ---------- 页眉 ---------- */
.ls-header { border-bottom: 10px solid var(--ls-shelf); background: var(--ls-page); }
.ls-header-inner { display: flex; align-items: center; gap: 20px; max-width: 1280px; margin: 0 auto; padding: 12px 24px; }
.ls-sign { display: inline-flex; align-items: flex-end; gap: 12px; margin-right: auto; min-width: 0; }
.ls-sign-books { display: inline-flex; align-items: flex-end; gap: 2px; height: 36px; }
.ls-sign-books i { display: block; width: 8px; border-radius: 1px; }
.ls-sign-books i:nth-child(1) { height: 30px; background: #11698e; }
.ls-sign-books i:nth-child(2) { height: 36px; background: #b23a48; }
.ls-sign-books i:nth-child(3) { height: 26px; background: #c26b16; transform: rotate(12deg); transform-origin: bottom left; }
.ls-sign-name { font-family: var(--ls-display); font-weight: 700; font-size: 1.6rem; line-height: 1; padding-top: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ls-nav { display: flex; gap: 6px; }
.ls-nav a { padding: 10px 12px; font-family: var(--ls-display); font-weight: 600; font-size: 1rem; }
.ls-nav a:hover { color: var(--ls-accent); }
.ls-nav a.is-on { color: var(--ls-accent); box-shadow: inset 0 -3px 0 var(--ls-accent); }
.ls-menu-toggle { display: none; color: inherit; }

/* ---------- 版心 ---------- */
.ls-stacks { min-height: 60vh; padding-bottom: 48px; }
.ls-wrap { max-width: 1280px; margin: 0 auto; padding: 24px 24px 0; }
.ls-crumb { display: flex; flex-wrap: wrap; gap: 8px; padding: 0 0 8px; font-size: .92rem; color: var(--ls-soft); }
.ls-crumb a { color: var(--ls-accent); font-weight: 600; }
.ls-empty { margin: 32px 0; text-align: center; color: var(--ls-soft); }
.ls-pager { margin-top: 32px; }

/* ---------- 层板 ---------- */
.ls-shelf { margin-bottom: 12px; }
.ls-shelf-label { display: inline-block; margin: 0 0 14px; padding: 4px 12px; background: var(--ls-page); border: 1px solid var(--ls-line); font-family: var(--ls-display); font-weight: 700; font-size: 1rem; letter-spacing: .12em; text-transform: uppercase; }
.ls-shelf-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 28px; padding: 0 16px 14px; background: linear-gradient(var(--ls-shelf), var(--ls-shelf-dark)) bottom / 100% 14px no-repeat; }
.ls-shelf-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; }
.ls-shelf-grid .ls-book { padding: 0 14px 28px; background: linear-gradient(var(--ls-shelf), var(--ls-shelf-dark)) 0 calc(100% - 10px) / 100% 14px no-repeat; }
.ls-shelf-grid .ls-book-link { margin-bottom: 24px; }

/* 立着的书：封面 + 左侧书脊 */
.ls-book { min-width: 0; display: flex; }
.ls-book-link { display: grid; gap: 8px; align-content: start; width: 100%; margin-bottom: 0; padding: 0 0 16px 10px; border-left: 10px solid var(--ls-spine); background: var(--ls-page); box-shadow: 2px 0 0 rgba(42, 31, 45, .08); }
.ls-cover { display: block; margin-left: -10px; }
.ls-cover img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; background: var(--ls-line); }
.ls-book-link > :not(.ls-cover) { margin-right: 14px; }
.ls-book-link .ls-book-mark { margin-top: 6px; }
.ls-book-title { font-family: var(--ls-display); font-weight: 700; font-size: 1.15rem; line-height: 1.25; }
.ls-book-link:hover .ls-book-title { color: var(--ls-accent); }
.ls-book-date { font-size: .86rem; color: var(--ls-soft); }

/* ---------- 首页头条：封面朝外的展示本 + 借书卡 ---------- */
.ls-display { margin-bottom: 28px; padding-bottom: 14px; background: linear-gradient(var(--ls-shelf), var(--ls-shelf-dark)) bottom / 100% 14px no-repeat; }
.ls-display-link { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); border-left: 14px solid var(--ls-spine); background: var(--ls-page); }
.ls-display-cover img { display: block; width: 100%; height: 100%; aspect-ratio: 5 / 2; object-fit: cover; background: var(--ls-line); }
.ls-display-text { display: grid; gap: 14px; align-content: center; padding: 24px 28px; }
.ls-display-title { font-family: var(--ls-display); font-weight: 700; font-size: clamp(1.7rem, 2.8vw, 2.5rem); line-height: 1.12; }
.ls-display-link:hover .ls-display-title { color: var(--ls-accent); }
.ls-display-excerpt { color: var(--ls-soft); line-height: 1.6; }
.ls-slip { display: grid; gap: 4px; justify-self: start; min-width: 220px; padding: 10px 14px; background: var(--ls-slip); background-image: repeating-linear-gradient(transparent 0 27px, #e9d9a6 27px 28px); border: 1px solid #e9d9a6; }
.ls-slip-row { display: flex; justify-content: space-between; gap: 16px; font-weight: 600; font-size: .92rem; line-height: 24px; }
.ls-slip-row small { font-family: var(--ls-display); font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ls-soft); }

/* ---------- 分类页：一层层书架上的书 ---------- */
.ls-cat-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; }
.ls-volume { min-width: 0; display: flex; padding: 0 14px 28px; background: linear-gradient(var(--ls-shelf), var(--ls-shelf-dark)) 0 calc(100% - 10px) / 100% 12px no-repeat; }
.ls-volume-link { display: grid; align-content: start; width: 100%; margin-bottom: 22px; border-left: 10px solid var(--ls-spine); background: var(--ls-page); }
.ls-volume-link img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: cover; background: var(--ls-line); }
.ls-volume-text { display: grid; gap: 8px; padding: 14px 16px 16px; }
.ls-volume-title { font-family: var(--ls-display); font-weight: 700; font-size: 1.2rem; line-height: 1.25; }
.ls-volume-link:hover .ls-volume-title { color: var(--ls-accent); }
.ls-volume-excerpt { color: var(--ls-soft); font-size: .95rem; line-height: 1.55; }
.ls-volume-meta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; font-size: .86rem; font-weight: 600; color: var(--ls-spine); }
.ls-cat-list > .ls-ad { margin-top: 0; }
.ls-cat-list > .ls-ad:not(:has(.ad)) { display: none; }

/* ---------- 目录：一摞平放的书 ---------- */
.ls-catalogue-title { margin: 8px 0 24px; font-family: var(--ls-display); font-weight: 700; font-size: clamp(2rem, 4vw, 3rem); }
.ls-spines { display: grid; justify-items: center; gap: 4px; max-width: 920px; margin: 0 auto; padding-bottom: 14px; background: linear-gradient(var(--ls-shelf), var(--ls-shelf-dark)) bottom / 100% 14px no-repeat; }
.ls-spine { display: grid; grid-template-columns: minmax(0, 1fr); gap: 2px; width: 92%; padding: 14px 24px; border-radius: 3px; background: var(--ls-spine); color: #fff; box-shadow: inset 0 3px 0 rgba(255, 255, 255, .18), inset 0 -3px 0 rgba(0, 0, 0, .18); }
.ls-spine:nth-child(3n + 1) { width: 86%; }
.ls-spine:nth-child(4n + 2) { width: 98%; }
.ls-spine:nth-child(5n) { width: 80%; }
.ls-spine-name { font-family: var(--ls-display); font-weight: 700; font-size: 1.2rem; letter-spacing: .06em; text-transform: uppercase; }
.ls-spine-desc { font-size: .92rem; line-height: 1.4; color: rgba(255, 255, 255, .9); }
.ls-spine:hover { filter: brightness(1.1); }

/* ---------- 广告壳：无广告时塌陷 ---------- */
.ls-ad:has(.ad) { margin: 24px 0; }
.ls-ad:has(.ad) .ad { min-height: 250px; margin: 0 !important; }

/* ---------- 页脚：书立夹着的阅览室卡片 ---------- */
.ls-footer { padding: 24px 24px 96px; }
.ls-footer-shelf { display: grid; grid-template-columns: 28px minmax(0, 1fr) 28px; align-items: end; gap: 0; max-width: 1080px; margin: 0 auto; padding-bottom: 14px; background: linear-gradient(var(--ls-shelf), var(--ls-shelf-dark)) bottom / 100% 14px no-repeat; }
.ls-bookend { height: 120px; background: var(--ls-ink); clip-path: polygon(0 0, 100% 30%, 100% 100%, 0 100%); }
.ls-bookend-r { clip-path: polygon(0 30%, 100% 0, 100% 100%, 0 100%); }
.ls-footer-card { padding: 20px 24px; background: var(--ls-page); text-align: center; }
.ls-footer-title { margin: 0; font-family: var(--ls-display); font-weight: 700; font-size: 1.25rem; }
.ls-footer-hours { margin: 4px 0 8px; color: var(--ls-soft); font-size: .92rem; }
.ls-footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 0 18px; }
.ls-footer-links a { display: inline-flex; align-items: center; min-height: 44px; color: var(--ls-accent); font-weight: 600; }

/* ---------- 共享页面调色 ---------- */
.theme-shelf .site-menu, .theme-shelf .site-search, .theme-shelf .static-page { --menu-accent: var(--ls-accent); }

/* ---------- 断点 ---------- */
@media (min-width: 1600px) {
    .ls-wrap, .ls-header-inner { max-width: 1520px; }
    .ls-shelf-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}

@media (max-width: 1023px) {
    .ls-display-link { grid-template-columns: minmax(0, 1fr); }
    .ls-display-cover img { aspect-ratio: 16 / 7; }
    .ls-shelf-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .ls-volume-excerpt { display: none; }
}

@media (max-width: 767px) {
    .ls-header { border-bottom-width: 6px; }
    .ls-header-inner { min-height: 56px; padding: 4px 12px; gap: 10px; }
    .ls-sign-books { height: 28px; }
    .ls-sign-books i:nth-child(1) { height: 24px; }
    .ls-sign-books i:nth-child(2) { height: 28px; }
    .ls-sign-books i:nth-child(3) { height: 20px; }
    .ls-sign-name { font-size: 1.3rem; }
    .ls-menu-toggle { display: inline-grid; place-items: center; width: 44px; height: 44px; border: 1px solid var(--ls-line); }
    .ls-wrap { padding: 12px 12px 0; }
    .ls-display { margin-bottom: 20px; }
    .ls-display-link { border-left-width: 8px; }
    .ls-display-cover img { aspect-ratio: 16 / 9; }
    .ls-display-text { padding: 14px; gap: 10px; }
    .ls-display-title { font-size: 1.45rem; }
    .ls-display-excerpt { display: none; }
    .ls-shelf-row { grid-template-columns: minmax(0, 1fr); gap: 12px; padding: 0 0 14px; }
    .ls-shelf-grid { grid-template-columns: minmax(0, 1fr); }
    .ls-shelf-grid .ls-book { padding: 0 0 16px; background-position: 0 calc(100% - 4px); background-size: 100% 8px; }
    .ls-shelf-grid .ls-book-link { margin-bottom: 12px; }
    .ls-book-link { grid-template-columns: 112px minmax(0, 1fr); gap: 4px 12px; padding: 0; border-left-width: 6px; }
    .ls-cover { grid-row: span 3; margin-left: 0; }
    .ls-cover img { height: 100%; min-height: 96px; aspect-ratio: auto; }
    .ls-book-link .ls-book-mark { margin-top: 10px; }
    .ls-book-link > :not(.ls-cover) { margin-right: 10px; }
    .ls-book-date { padding-bottom: 10px; }
    .ls-book-title { font-size: 1.05rem; }
    .ls-cat-list { grid-template-columns: minmax(0, 1fr); }
    .ls-volume { padding: 0 0 14px; background-position: 0 calc(100% - 2px); background-size: 100% 8px; }
    .ls-volume-link { grid-template-columns: 96px minmax(0, 1fr); margin-bottom: 10px; border-left-width: 6px; }
    .ls-volume-link img { width: 96px; height: 100%; min-height: 96px; aspect-ratio: auto; }
    .ls-volume-text { padding: 10px 12px; gap: 6px; }
    .ls-volume-title { font-size: 1.05rem; }
    .ls-spine { width: 100% !important; padding: 12px 16px; }
    .ls-footer { padding: 16px 12px 96px; }
    .ls-footer-shelf { grid-template-columns: 16px minmax(0, 1fr) 16px; }
    .ls-bookend { height: 90px; }
}

/* 移动端：目录导航只在 /menu 出现，隐藏规则放在全局规则之后 */
@media (max-width: 767px) {
    .ls-nav { display: none; }
}