/* ============================================================
   墨香书阁 · 全站样式（纯 HTML5 + CSS3 版本，不含任何 JavaScript）
   设计基调：水墨 + 宣纸 + 印泥朱红，取"墨香"二字的东方书卷气
   交互说明：
   - 移动端导航菜单：checkbox + label 实现的"复选框技巧"
   - 首页轮播横幅：radio + label 实现的"单选框技巧"
   - 书籍分类筛选：同样使用 radio + label 技巧，通过通用兄弟选择器 ~ 控制显示/隐藏
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700;900&family=Noto+Sans+SC:wght@300;400;500;700&family=Ma+Shan+Zheng&display=swap');

:root{
  --ink:#1B1B18;
  --ink-soft:#2B2A26;
  --ink-faint:#55534C;
  --paper:#F1EADA;
  --paper-deep:#E7DDC6;
  --paper-card:#FBF7EC;
  --seal:#B3382C;
  --seal-dark:#8C2A21;
  --bamboo:#5C7A5E;
  --bamboo-light:#7FA084;
  --gold:#B8963E;
  --line: rgba(27,27,24,0.14);
  --line-strong: rgba(27,27,24,0.28);
  --shadow: 0 14px 34px rgba(27,27,24,0.16);
  --shadow-soft: 0 6px 18px rgba(27,27,24,0.10);
  --radius: 3px;
  --font-display:'Noto Serif SC', serif;
  --font-brush:'Ma Shan Zheng', cursive;
  --font-body:'Noto Sans SC', sans-serif;
  --maxw: 1140px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;margin:0;padding:0;}
h1,h2,h3,h4{font-family:var(--font-display);margin:0;font-weight:700;letter-spacing:.02em;}
p{margin:0;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;}
}

/* 所有用于纯 CSS 交互的 radio / checkbox 一律视觉隐藏，但保留可键盘访问 */
.visually-hidden-input{
  position:absolute;
  width:1px;height:1px;
  opacity:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
}

/* ---------------- 印章元素 (signature) ---------------- */
.seal{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:44px;height:44px;
  border:2px solid var(--seal);
  color:var(--seal);
  font-family:var(--font-brush);
  font-size:22px;
  border-radius:4px;
  transform:rotate(-4deg);
  background:rgba(179,56,44,0.05);
  flex:none;
}
.seal.small{width:34px;height:34px;font-size:16px;border-width:1.5px;}

/* ---------------- 头部导航 ---------------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(241,234,218,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.site-header .wrap{
  display:flex;align-items:center;justify-content:space-between;
  height:76px;
}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{font-family:var(--font-brush);font-size:34px;color:var(--seal);line-height:1;}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-text .cn{font-family:var(--font-display);font-size:20px;font-weight:900;letter-spacing:.12em;}
.brand-text .en{font-size:10px;letter-spacing:.28em;color:var(--ink-faint);text-transform:uppercase;}

.main-nav ul{display:flex;gap:36px;}
.main-nav a{
  font-size:15px;letter-spacing:.04em;position:relative;padding:6px 2px;
  color:var(--ink-soft);
  display:inline-block;
}
.main-nav a::after{
  content:'';position:absolute;left:0;right:100%;bottom:-2px;height:2px;background:var(--seal);
  transition:right .25s ease;
}
.main-nav a:hover::after,.main-nav a.active::after{right:0;}
.main-nav a.active{color:var(--seal);}

.nav-toggle{
  display:none;background:none;border:1px solid var(--line-strong);border-radius:4px;
  width:42px;height:38px;cursor:pointer;position:relative;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:'';position:absolute;left:10px;right:10px;height:2px;background:var(--ink);
  transition:transform .2s ease, opacity .2s ease;
}
.nav-toggle span{top:50%;transform:translateY(-50%);}
.nav-toggle span::before{top:-7px;}
.nav-toggle span::after{top:7px;}

@media (max-width:860px){
  .main-nav{
    position:fixed;inset:76px 0 0 0;background:var(--paper);
    transform:translateX(100%);transition:transform .3s ease;
    border-top:1px solid var(--line);
  }
  .main-nav ul{flex-direction:column;gap:0;padding:12px 28px;}
  .main-nav li{border-bottom:1px solid var(--line);}
  .main-nav a{display:block;padding:16px 2px;}
  .nav-toggle{display:block;}
  /* checkbox 技巧：勾选状态下推出移动端菜单 */
  .nav-toggle-input:checked ~ .main-nav{transform:translateX(0);}
  .nav-toggle-input:checked ~ .nav-toggle span{background:transparent;}
  .nav-toggle-input:checked ~ .nav-toggle span::before{transform:rotate(45deg) translate(5px,6px);}
  .nav-toggle-input:checked ~ .nav-toggle span::after{transform:rotate(-45deg) translate(5px,-6px);}
}

/* ---------------- 通用页头（内页） ---------------- */
.page-hero{
  background:var(--ink);
  color:var(--paper);
  padding:64px 0 46px;
  position:relative;
  overflow:hidden;
}
.page-hero .eyebrow{font-family:var(--font-brush);color:var(--gold);font-size:22px;}
.page-hero h1{font-size:34px;color:var(--paper);margin-top:6px;}
.page-hero p{color:rgba(241,234,218,0.72);max-width:560px;margin-top:14px;font-size:15px;}
.ink-wash-bg{position:absolute;inset:0;opacity:.4;pointer-events:none;width:100%;height:100%;}

/* ---------------- 首页 Hero 轮播（纯 CSS radio 技巧） ---------------- */
.hero-carousel{
  position:relative;background:var(--ink);color:var(--paper);overflow:hidden;
}
.hero-carousel .ink-wash-bg{opacity:.3;}
.carousel-track{position:relative;height:520px;}
.slide{
  position:absolute;inset:0;
  display:flex;align-items:center;
  opacity:0;visibility:hidden;
  transition:opacity .7s ease;
}
.slide .wrap{display:flex;align-items:center;gap:56px;width:100%;position:relative;}
.slide-copy{max-width:480px;}
.slide-tag{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.22em;color:var(--gold);text-transform:uppercase;margin-bottom:18px;
}
.slide-tag::before{content:'';width:26px;height:1px;background:var(--gold);}
.slide h2{font-size:40px;line-height:1.25;color:var(--paper);}
.slide .author{color:rgba(241,234,218,.65);margin-top:10px;font-size:14px;letter-spacing:.05em;}
.slide .hook{margin-top:20px;color:rgba(241,234,218,.85);font-size:15px;line-height:1.9;}
.slide .cta{
  margin-top:28px;display:inline-flex;align-items:center;gap:10px;
  border:1px solid var(--gold);color:var(--gold);padding:11px 26px;
  font-size:14px;letter-spacing:.08em;border-radius:2px;transition:all .25s ease;
}
.slide .cta:hover{background:var(--gold);color:var(--ink);}

.slide-cover{
  width:230px;height:320px;flex:none;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-display);font-size:76px;font-weight:900;
  border:1px solid rgba(241,234,218,.25);
  position:relative;
  box-shadow:0 30px 60px rgba(0,0,0,.45);
}
.slide-cover::before{
  content:'';position:absolute;left:14px;top:0;bottom:0;width:1px;background:rgba(241,234,218,.3);
}
.slide-cover .seal{position:absolute;right:-16px;bottom:-16px;}

/* 轮播切换开关（3 张，可按需增减） */
#hs1:checked ~ .carousel-track #slide-1,
#hs2:checked ~ .carousel-track #slide-2,
#hs3:checked ~ .carousel-track #slide-3{
  opacity:1;visibility:visible;
}
.carousel-nav{
  position:absolute;bottom:26px;left:0;right:0;
  display:flex;align-items:center;justify-content:center;gap:14px;
  z-index:5;
}
.dot{width:9px;height:9px;border-radius:50%;border:1px solid var(--gold);background:transparent;cursor:pointer;padding:0;display:inline-block;}
#hs1:checked ~ .carousel-nav label[for="hs1"],
#hs2:checked ~ .carousel-nav label[for="hs2"],
#hs3:checked ~ .carousel-nav label[for="hs3"]{background:var(--gold);}

.carousel-arrow{
  position:absolute;top:50%;transform:translateY(-50%);
  width:44px;height:44px;border-radius:50%;
  border:1px solid rgba(241,234,218,.4);background:rgba(0,0,0,.15);color:var(--paper);
  display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:18px;
  transition:background .2s ease;
}
.carousel-arrow:hover{background:rgba(241,234,218,.15);}
.carousel-arrow.prev{left:24px;}
.carousel-arrow.next{right:24px;}
@media (max-width:760px){
  .carousel-track{height:auto;padding:56px 0;}
  .slide{position:relative;}
  .slide .wrap{flex-direction:column-reverse;text-align:center;gap:32px;}
  .slide h2{font-size:28px;}
  .slide-copy{max-width:100%;}
  .carousel-arrow{display:none;}
}

/* ---------------- 分区标题 ---------------- */
.section{padding:74px 0;}
.section.alt{background:var(--paper-deep);}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  margin-bottom:40px;flex-wrap:wrap;gap:18px;
}
.section-head .brush-label{font-family:var(--font-brush);font-size:26px;color:var(--seal);}
.section-head h2{font-size:28px;margin-top:6px;}
.section-head .desc{color:var(--ink-faint);font-size:14px;margin-top:8px;max-width:460px;}
.more-link{font-size:13px;letter-spacing:.08em;border-bottom:1px solid var(--ink);padding-bottom:2px;}

/* ---------------- 分类导航卡片 ---------------- */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.cat-card{
  background:var(--paper-card);
  border:1px solid var(--line);
  padding:34px 28px;
  position:relative;
  transition:transform .25s ease, box-shadow .25s ease;
  display:block;
}
.cat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);}
.cat-card .num{font-family:var(--font-display);font-size:13px;color:var(--ink-faint);letter-spacing:.1em;}
.cat-card h3{font-size:24px;margin-top:14px;}
.cat-card p{font-size:13px;color:var(--ink-faint);margin-top:12px;}
.cat-card .go{
  margin-top:22px;display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--seal);
}
@media (max-width:760px){.cat-grid{grid-template-columns:1fr;}}

/* ---------------- 书籍卡片 ---------------- */
.book-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px 26px;}
.book-card{
  background:var(--paper-card);
  border:1px solid var(--line);
  display:flex;flex-direction:column;
  transition:box-shadow .25s ease, transform .25s ease;
}
.book-card:hover{box-shadow:var(--shadow);transform:translateY(-4px);}
.book-cover{
  height:190px;position:relative;overflow:hidden;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-display);font-weight:900;font-size:64px;color:rgba(251,247,236,.92);
  border-bottom:1px solid var(--line);
}
.book-cover::after{
  content:'';position:absolute;inset:0;
  background:repeating-linear-gradient(135deg, rgba(255,255,255,0.06) 0 2px, transparent 2px 26px);
}
.tone-novel .book-cover{background:linear-gradient(155deg,#8C2A21,#B3382C 60%,#6b1d16);}
.tone-prose .book-cover{background:linear-gradient(155deg,#4A5F4C,#5C7A5E 60%,#374837);}
.tone-social .book-cover{background:linear-gradient(155deg,#8A6C29,#B8963E 60%,#6d5420);}
.book-cover .cat-chip{
  position:absolute;top:12px;left:12px;
  font-size:11px;letter-spacing:.1em;color:var(--paper);
  border:1px solid rgba(251,247,236,.5);padding:3px 9px;border-radius:20px;
  font-family:var(--font-body);
}
.book-body{padding:20px 20px 22px;display:flex;flex-direction:column;gap:10px;flex:1;}
.book-body h3{font-size:18px;}
.book-body .author{font-size:12.5px;color:var(--ink-faint);letter-spacing:.04em;}
.book-body .intro{font-size:13px;color:var(--ink-soft);line-height:1.75;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;}
.book-body .review{
  margin-top:auto;padding-top:12px;border-top:1px dashed var(--line-strong);
  font-size:12.5px;color:var(--ink-faint);
}
.book-body .review span{color:var(--seal);font-family:var(--font-brush);font-size:15px;margin-right:4px;}
.book-body .read-more{
  margin-top:6px;font-size:12.5px;letter-spacing:.06em;color:var(--seal);align-self:flex-start;
}
@media (max-width:900px){.book-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.book-grid{grid-template-columns:1fr;}}

/* ---------------- 分类筛选 tabs（纯 CSS radio 技巧，见 books.html） ---------------- */
.filter-bar{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:34px;}
.filter-btn{
  padding:9px 20px;border:1px solid var(--line-strong);background:transparent;
  font-family:var(--font-body);font-size:13.5px;letter-spacing:.04em;cursor:pointer;color:var(--ink-soft);
  border-radius:20px; transition:all .2s ease;display:inline-block;
}
.filter-btn:hover{border-color:var(--ink);}
#f-all:checked ~ .filter-bar label[for="f-all"],
#f-novel:checked ~ .filter-bar label[for="f-novel"],
#f-prose:checked ~ .filter-bar label[for="f-prose"],
#f-social:checked ~ .filter-bar label[for="f-social"]{
  background:var(--ink);border-color:var(--ink);color:var(--paper);
}
#f-novel:checked ~ .book-grid .book-card:not(.cat-novel){display:none;}
#f-prose:checked ~ .book-grid .book-card:not(.cat-prose){display:none;}
#f-social:checked ~ .book-grid .book-card:not(.cat-social){display:none;}

/* ---------------- 专栏文章卡片 ---------------- */
.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.article-card{background:var(--paper-card);border:1px solid var(--line);display:flex;flex-direction:column;transition:box-shadow .25s ease, transform .25s ease;}
.article-card:hover{box-shadow:var(--shadow);transform:translateY(-4px);}
.article-thumb{
  height:150px;position:relative;
  background:linear-gradient(160deg,var(--ink),#3a382f);
  display:flex;align-items:center;justify-content:center;
}
.article-thumb svg{width:64px;height:64px;opacity:.85;}
.article-body{padding:20px;display:flex;flex-direction:column;gap:8px;flex:1;}
.article-meta{font-size:11.5px;letter-spacing:.06em;color:var(--seal);text-transform:uppercase;}
.article-body h3{font-size:17px;line-height:1.5;}
.article-body .excerpt{font-size:13px;color:var(--ink-faint);
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;}
.article-foot{margin-top:auto;padding-top:10px;border-top:1px dashed var(--line-strong);
  font-size:12px;color:var(--ink-faint);display:flex;justify-content:space-between;}
@media (max-width:900px){.article-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.article-grid{grid-template-columns:1fr;}}

/* ---------------- 详情页 ---------------- */
.detail-layout{display:grid;grid-template-columns:260px 1fr;gap:48px;align-items:flex-start;}
.detail-cover{
  height:360px;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-display);font-weight:900;font-size:96px;color:rgba(251,247,236,.92);
  position:sticky;top:100px;box-shadow:var(--shadow);
}
.detail-main h1{font-size:30px;}
.detail-main .author-line{margin-top:8px;color:var(--ink-faint);font-size:14px;}
.detail-main .chip{display:inline-block;margin-top:14px;font-size:12px;letter-spacing:.08em;
  border:1px solid var(--line-strong);padding:4px 12px;border-radius:20px;color:var(--ink-soft);}
.detail-main .intro-block{margin-top:26px;font-size:15px;line-height:2;color:var(--ink-soft);}
.reviews-block{margin-top:40px;}
.reviews-block h3{font-size:18px;margin-bottom:16px;font-family:var(--font-body);font-weight:700;}
.review-item{padding:16px 0;border-bottom:1px solid var(--line);}
.review-item .name{font-size:13.5px;font-weight:700;color:var(--seal);}
.review-item .text{font-size:14px;color:var(--ink-soft);margin-top:6px;}
.review-form{margin-top:26px;background:var(--paper-card);border:1px solid var(--line);padding:22px;border-radius:4px;}
@media (max-width:800px){.detail-layout{grid-template-columns:1fr;}.detail-cover{position:relative;top:0;height:260px;}}

.article-detail-main{max-width:720px;margin:0 auto;}
.article-detail-main .meta-line{font-size:13px;color:var(--ink-faint);margin-top:10px;}
.article-detail-main h1{font-size:32px;margin-top:14px;}
.article-detail-main .body-text p{font-size:15.5px;line-height:2;color:var(--ink-soft);margin-bottom:20px;}
.related-box{margin-top:44px;padding:22px;border:1px solid var(--line-strong);background:var(--paper-card);
  display:flex;align-items:center;gap:18px;}
.related-box .mini-cover{width:60px;height:82px;flex:none;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-display);font-weight:900;font-size:28px;color:#fff;}

/* ---------------- 表单元素 ---------------- */
.field{margin-bottom:16px;}
.field label{display:block;font-size:13px;color:var(--ink-soft);margin-bottom:6px;letter-spacing:.03em;}
.field input,.field select,.field textarea{
  width:100%;border:1px solid var(--line-strong);background:var(--paper);
  padding:11px 13px;font-family:var(--font-body);font-size:14px;color:var(--ink);border-radius:2px;
}
.field textarea{resize:vertical;min-height:110px;}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--seal);outline-offset:1px;}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--seal);color:var(--paper-card);border:none;
  padding:12px 28px;font-size:14px;letter-spacing:.05em;cursor:pointer;border-radius:2px;
  font-family:var(--font-body);transition:background .2s ease;
}
.btn:hover{background:var(--seal-dark);}
.btn:focus-visible, a:focus-visible, button:focus-visible, label:focus-within{outline:2px solid var(--seal);outline-offset:2px;}
.form-note{font-size:12px;color:var(--ink-faint);margin-top:8px;}

/* ---------------- 读书笔记页 ---------------- */
.notes-layout{display:grid;grid-template-columns:380px 1fr;gap:44px;align-items:flex-start;}
.notes-form-box{position:sticky;top:100px;background:var(--paper-card);border:1px solid var(--line);padding:26px;border-radius:4px;}
.notes-form-box h3{font-size:18px;margin-bottom:18px;}
.note-card{
  background:var(--paper-card);border:1px solid var(--line);padding:22px;margin-bottom:18px;
  position:relative;
}
.note-card .top-row{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;}
.note-card .who{font-weight:700;font-size:14.5px;}
.note-card .book-tag{font-size:11.5px;color:var(--bamboo);border:1px solid var(--bamboo-light);
  padding:2px 10px;border-radius:20px;}
.note-card .n-title{font-family:var(--font-display);font-size:17px;margin-top:10px;}
.note-card .n-body{font-size:14px;color:var(--ink-soft);margin-top:8px;line-height:1.85;white-space:pre-wrap;}
.note-card .bottom-row{display:flex;align-items:center;justify-content:space-between;margin-top:14px;
  padding-top:12px;border-top:1px dashed var(--line-strong);font-size:12px;color:var(--ink-faint);}
.like-tag{border:1px solid var(--line-strong);border-radius:20px;padding:5px 14px;font-size:12.5px;color:var(--ink-soft);display:inline-flex;gap:6px;align-items:center;}
.empty-state{padding:40px 20px;text-align:center;color:var(--ink-faint);border:1px dashed var(--line-strong);}
@media (max-width:900px){.notes-layout{grid-template-columns:1fr;}.notes-form-box{position:relative;top:0;}}

/* ---------------- 分割线（水墨笔触） ---------------- */
.brush-divider{display:flex;justify-content:center;padding:6px 0 0;}
.brush-divider svg{width:180px;height:22px;}

/* ---------------- 页脚 ---------------- */
.site-footer{background:var(--ink);color:rgba(241,234,218,.75);padding:52px 0 30px;margin-top:0;}
.footer-top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:30px;padding-bottom:28px;border-bottom:1px solid rgba(241,234,218,.14);}
.footer-brand{display:flex;align-items:center;gap:12px;}
.footer-brand .brand-mark{color:var(--gold);}
.footer-brand .cn{color:var(--paper);font-family:var(--font-display);font-weight:900;font-size:19px;}
.footer-links{display:flex;gap:44px;flex-wrap:wrap;}
.footer-col h4{color:var(--paper);font-size:13px;letter-spacing:.08em;margin-bottom:12px;font-family:var(--font-body);}
.footer-col a{display:block;font-size:13px;color:rgba(241,234,218,.65);margin-bottom:9px;}
.footer-col a:hover{color:var(--gold);}
.footer-bottom{padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:12px;color:rgba(241,234,218,.5);}
.back-top{color:var(--gold);}

/* ---------------- 面包屑 / 通用工具 ---------------- */
.crumb{font-size:12.5px;color:var(--ink-faint);margin-bottom:16px;}
.crumb a{color:var(--seal);}

/* 静态演示提示条（替代原本的 JS toast，直接以静态说明文字呈现） */
.static-hint{
  margin-top:10px;font-size:12.5px;color:var(--bamboo);
  border-left:2px solid var(--bamboo-light);padding-left:10px;
}