/* ==========================================================================
   《大医遗响——欧阳卫权医师纪念文存》定制主题样式 (V0.2 细化版)
   调性：古朴 · 庄重 · 简洁 · 文雅 · 文人书卷气
   依托：tokens.css (三层设计令牌架构)
   ========================================================================== */

/* 基础重置与宣纸底色 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-page-bg, #F8F5EE);
}

body.ancient-body {
  font-family: var(--primitive-font-serif);
  color: var(--color-text-body, #292623);
  background-color: var(--color-page-bg, #F8F5EE);
  background-image: var(--xuan-texture);
  background-repeat: repeat;
  line-height: var(--line-height-prose, 2.05);
  letter-spacing: var(--letter-spacing-prose, 0.025em);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 基础文字与链接 */
a {
  color: inherit;
  text-decoration: none;
  transition: all 0.28s cubic-bezier(0.25, 1, 0.5, 1);
}

/* ==========================================================================
   金石篆刻印章组件 (Seal Stamp System)
   ========================================================================== */
.seal-icon, .seal-stamp-cinnabar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-seal-cinnabar, #9E2A2B);
  color: #FFFDF8;
  font-family: var(--primitive-font-kaiti);
  font-weight: 700;
  font-size: 0.76rem;
  line-height: 1.15;
  padding: 0.38rem 0.5rem;
  border-radius: 2px;
  letter-spacing: 0.1em;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: inset 0 0 4px rgba(0, 0, 0, 0.25), 0 2px 6px rgba(158, 42, 43, 0.22);
  position: relative;
  user-select: none;
}

/* 白文印章（红底凹刻白字质感） */
.seal-stamp-white {
  display: inline-block;
  background: transparent;
  color: var(--color-seal-cinnabar, #9E2A2B);
  border: 1.5px solid var(--color-seal-cinnabar, #9E2A2B);
  padding: 0.2rem 0.65rem;
  font-family: var(--primitive-font-kaiti);
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 2px;
  letter-spacing: 0.12em;
  background-color: var(--color-seal-bg-tint);
}

/* 椭圆/长条引首章 */
.seal-oval-intro {
  display: inline-block;
  color: #FFFDF8;
  background-color: var(--color-seal-cinnabar, #9E2A2B);
  font-family: var(--primitive-font-kaiti);
  font-size: 0.75rem;
  padding: 0.18rem 0.65rem;
  border-radius: 12px;
  letter-spacing: 0.14em;
  box-shadow: 0 1px 4px rgba(158, 42, 43, 0.25);
}

/* ==========================================================================
   顶部典雅导航栏 (Ancient Header)
   ========================================================================== */
.ancient-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 245, 238, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--primitive-paper-dark, #E6DEC9);
  box-shadow: 0 2px 12px rgba(45, 38, 30, 0.03);
}

.nav-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0.85rem 1.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.95rem;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.site-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-title, #1C1A18);
  letter-spacing: 0.1em;
}

.site-sub {
  font-size: 0.76rem;
  color: var(--color-text-secondary, #57524C);
  letter-spacing: 0.08em;
  margin-top: 1px;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-item {
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--color-text-secondary, #57524C);
  letter-spacing: 0.08em;
  padding: 0.35rem 0;
  position: relative;
}

.nav-item:hover, .nav-item.active {
  color: var(--color-seal-cinnabar, #9E2A2B);
}

.nav-item.active::after, .nav-item:hover::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background-color: var(--color-seal-cinnabar, #9E2A2B);
  border-radius: 2px;
}

/* 移动端汉堡切换按钮 */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-title, #1C1A18);
  border-radius: 1px;
  transition: all 0.3s ease;
}

/* ==========================================================================
   移动端抽屉 (Mobile Drawer)
   ========================================================================== */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: -300px;
  width: 270px;
  height: 100%;
  background: var(--color-page-bg, #F8F5EE);
  background-image: var(--xuan-texture);
  border-left: 1px solid var(--primitive-paper-dark, #E6DEC9);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  padding: 1.8rem;
  transition: right 0.32s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: -8px 0 30px rgba(0,0,0,0.1);
}

.mobile-drawer.open {
  right: 0;
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--primitive-paper-dark);
}

.drawer-seal {
  background: var(--color-seal-cinnabar);
  color: #fff;
  padding: 0.25rem 0.7rem;
  font-family: var(--primitive-font-kaiti);
  font-size: 0.88rem;
  border-radius: 2px;
}

.drawer-close {
  background: none;
  border: none;
  font-size: 1.7rem;
  cursor: pointer;
  color: var(--color-text-secondary);
}

.drawer-nav {
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
  flex: 1;
}

.drawer-item {
  font-size: 1.08rem;
  color: var(--color-text-body);
  letter-spacing: 0.08em;
  padding: 0.45rem 0;
  border-bottom: 1px dashed var(--primitive-paper-dark);
}

.drawer-item.active, .drawer-item:hover {
  color: var(--color-seal-cinnabar);
  padding-left: 0.5rem;
}

.drawer-footer {
  text-align: center;
  padding-top: 1.2rem;
  border-top: 1px solid var(--primitive-paper-dark);
}

.drawer-poem {
  font-family: var(--primitive-font-kaiti);
  font-size: 0.88rem;
  color: var(--color-text-tertiary);
  letter-spacing: 0.08em;
}

.drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(30, 25, 20, 0.45);
  z-index: 999;
  display: none;
  backdrop-filter: blur(3px);
}

.drawer-backdrop.active {
  display: block;
}

/* ==========================================================================
   主体内容容器 (Main Wrapper)
   ========================================================================== */
.main-wrapper {
  flex: 1;
  max-width: 1140px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.8rem 5rem;
}

/* ==========================================================================
   首页卷首排版 (Index Page)
   ========================================================================== */
.index-container {
  display: flex;
  flex-direction: column;
  gap: 4.5rem;
}

.hero-scroll {
  background: var(--color-card-bg, #FCFAF5);
  border: 1px solid var(--primitive-paper-dark, #E6DEC9);
  border-radius: var(--radius-card, 6px);
  overflow: hidden;
  box-shadow: var(--shadow-book-page);
  position: relative;
}

.hero-image-wrap {
  width: 100%;
  height: 400px;
  position: relative;
  overflow: hidden;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  filter: sepia(8%) contrast(98%);
  transition: transform 1.2s ease;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, rgba(252, 250, 245, 0.02) 40%, rgba(252, 250, 245, 0.96) 100%);
}

.hero-caption {
  padding: 1.8rem 2.8rem 3.5rem;
  text-align: center;
  position: relative;
  margin-top: -3.8rem;
}

.hero-seal-badge {
  display: inline-block;
  background: var(--color-seal-cinnabar);
  color: #FFFDF8;
  padding: 0.22rem 0.9rem;
  font-size: 0.82rem;
  font-family: var(--primitive-font-kaiti);
  border-radius: 2px;
  margin-bottom: 0.9rem;
  letter-spacing: 0.1em;
  box-shadow: 0 2px 6px rgba(158, 42, 43, 0.25);
}

.hero-title {
  font-size: 2.45rem;
  font-weight: 700;
  color: var(--color-text-title);
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
}

.hero-subtitle {
  font-size: 0.96rem;
  color: var(--color-text-tertiary);
  letter-spacing: 0.12em;
  margin-bottom: 2rem;
}

.hero-motto-box {
  max-width: 700px;
  margin: 0 auto;
  padding: 1.4rem 2.2rem;
  background: var(--color-page-bg);
  border: 1px solid var(--primitive-paper-dark);
  border-radius: var(--radius-subtle);
  position: relative;
  box-shadow: inset 0 0 10px rgba(45, 38, 30, 0.03);
}

.hero-motto {
  font-family: var(--primitive-font-kaiti);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-body);
  line-height: 1.85;
  letter-spacing: 0.08em;
}

.quote-mark {
  position: absolute;
  font-size: 3.2rem;
  color: var(--primitive-ink-faint);
  font-family: serif;
  line-height: 1;
}

.quote-left {
  top: -10px;
  left: 10px;
}

.quote-right {
  bottom: -24px;
  right: 10px;
}

/* 章节标题印泥式修饰 */
.section-seal-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  margin-bottom: 0.85rem;
}

.red-line {
  display: inline-block;
  width: 44px;
  height: 1px;
  background-color: var(--color-seal-cinnabar);
  opacity: 0.65;
}

.section-title {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-text-title);
  text-align: center;
}

.section-desc {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 2.8rem;
  color: var(--color-text-secondary);
  font-size: 1.02rem;
  line-height: 1.9;
}

/* 三重境界卡片 */
.realm-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

.realm-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border-soft);
  border-radius: var(--radius-card);
  padding: 2.4rem 2rem;
  box-shadow: var(--shadow-book-page);
  transition: all 0.32s cubic-bezier(0.25, 1, 0.5, 1);
  display: flex;
  flex-direction: column;
}

.realm-card:hover {
  transform: translateY(-5px);
  background: var(--color-card-bg-hover);
  border-color: var(--primitive-paper-dark);
  box-shadow: var(--shadow-book-page-hover);
}

.realm-icon {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-seal-bg-tint);
  color: var(--color-seal-cinnabar);
  font-family: var(--primitive-font-kaiti);
  font-size: 1.35rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.3rem;
  border: 1px solid rgba(158, 42, 43, 0.22);
}

.realm-name {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text-title);
  margin-bottom: 0.35rem;
  letter-spacing: 0.06em;
}

.realm-sub {
  font-size: 0.88rem;
  color: var(--color-academic-accent);
  font-family: var(--primitive-font-kaiti);
  margin-bottom: 1.1rem;
}

.realm-text {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
  text-align: justify;
}

/* 五大卷帙导航卡片 */
.volume-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.6rem;
}

.volume-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border-soft);
  border-radius: var(--radius-card);
  padding: 2rem;
  box-shadow: var(--shadow-book-page);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.volume-card:hover {
  border-color: var(--color-seal-cinnabar);
  background: var(--color-card-bg-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-book-page-hover);
}

.volume-tag {
  align-self: flex-start;
  font-size: 0.78rem;
  font-family: var(--primitive-font-kaiti);
  color: var(--color-seal-cinnabar);
  background: var(--color-seal-bg-tint);
  padding: 0.18rem 0.55rem;
  border-radius: 2px;
  margin-bottom: 0.9rem;
  letter-spacing: 0.08em;
}

.volume-title {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-text-title);
  margin-bottom: 0.65rem;
  letter-spacing: 0.08em;
}

.volume-summary {
  font-size: 0.94rem;
  color: var(--color-text-secondary);
  line-height: 1.85;
  margin-bottom: 1.3rem;
  flex: 1;
  text-align: justify;
}

.volume-enter {
  font-size: 0.9rem;
  color: var(--color-seal-cinnabar);
  font-weight: 600;
  letter-spacing: 0.06em;
}

/* 编委会特约卡片 */
.editor-note-preview {
  background: var(--primitive-paper-aged);
  border: 1px solid var(--primitive-paper-dark);
  border-radius: var(--radius-card);
  padding: 2.5rem;
  box-shadow: var(--shadow-book-page);
}

.note-header {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: 1.2rem;
}

.note-seal {
  background: var(--color-seal-cinnabar);
  color: #fff;
  font-size: 0.78rem;
  padding: 0.2rem 0.6rem;
  border-radius: 2px;
  font-family: var(--primitive-font-kaiti);
}

.note-title {
  font-size: 1.35rem;
  font-weight: 600;
}

.note-quote {
  font-size: 1.02rem;
  line-height: 2.05;
  color: var(--color-text-secondary);
  margin-bottom: 1.6rem;
  text-align: justify;
}

.note-sign {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.92rem;
  color: var(--color-text-tertiary);
}

.note-link {
  color: var(--color-seal-cinnabar);
  font-weight: 600;
}

/* ==========================================================================
   文章详情页与专栏独立页 (Article & Page)
   ========================================================================== */
.article-container, .page-container {
  background: var(--color-card-bg);
  border: 1px solid var(--primitive-paper-dark);
  border-radius: var(--radius-card);
  padding: 3.8rem 4rem 4.5rem;
  box-shadow: var(--shadow-book-page);
  position: relative;
}

.article-header, .page-header {
  text-align: center;
  margin-bottom: 3rem;
}

.badge-seal {
  display: inline-block;
  font-size: 0.82rem;
  font-family: var(--primitive-font-kaiti);
  color: var(--color-seal-cinnabar);
  background: var(--color-seal-bg-tint);
  padding: 0.25rem 0.9rem;
  border-radius: 2px;
  border: 1px solid rgba(158, 42, 43, 0.25);
  margin-bottom: 1.3rem;
  letter-spacing: 0.1em;
}

.article-title, .page-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-text-title);
  line-height: 1.42;
  letter-spacing: 0.08em;
  margin-bottom: 1.1rem;
}

.page-eyebrow {
  display: block;
  font-size: 0.94rem;
  color: var(--color-academic-accent);
  font-family: var(--primitive-font-kaiti);
  margin-bottom: 0.6rem;
  letter-spacing: 0.08em;
}

.article-author-card {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 1.4rem;
  background: var(--color-page-bg);
  border: 1px solid var(--color-card-border-soft);
  border-radius: var(--radius-subtle);
  font-size: 0.96rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.9rem;
}

.author-name {
  font-weight: 600;
  color: var(--color-text-title);
}

.author-desc {
  color: var(--color-text-tertiary);
}

.article-occasion {
  font-size: 0.9rem;
  color: var(--color-text-tertiary);
  margin-bottom: 1.4rem;
}

.article-divider, .page-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  margin-top: 2rem;
}

.divider-line {
  width: 70px;
  height: 1px;
  background-color: var(--primitive-ink-faint);
}

.divider-seal {
  font-family: var(--primitive-font-kaiti);
  color: var(--color-seal-cinnabar);
  font-size: 0.95rem;
}

/* 正文排版 */
.article-body, .page-body {
  font-size: 1.1rem;
  line-height: var(--line-height-prose, 2.05);
  color: var(--color-text-body);
  letter-spacing: var(--letter-spacing-prose, 0.025em);
}

.article-body p, .page-body p {
  margin-bottom: 1.8rem;
  text-indent: var(--paragraph-indent, 2.16em);
  text-align: justify;
}

.article-body h2, .page-body h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-title);
  margin: 2.8rem 0 1.3rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--color-card-border-soft);
  letter-spacing: 0.06em;
  text-indent: 0;
}

.article-body h3, .page-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-academic-accent);
  margin: 2rem 0 0.9rem;
  letter-spacing: 0.05em;
  text-indent: 0;
}

.article-body blockquote, .page-body blockquote {
  margin: 2.2rem 0;
  padding: 1.3rem 2rem;
  background: var(--color-page-bg);
  border-left: 4px solid var(--color-seal-cinnabar);
  border-radius: 0 var(--radius-subtle) var(--radius-subtle) 0;
  font-size: 1.04rem;
  color: var(--color-text-secondary);
}

.article-body blockquote p, .page-body blockquote p {
  text-indent: 0;
  margin-bottom: 0.65rem;
}

.article-body blockquote p:last-child, .page-body blockquote p:last-child {
  margin-bottom: 0;
}

.article-body strong, .page-body strong {
  font-weight: 600;
  color: var(--primitive-ink-pitch);
}

/* 导言框 */
.page-intro-box {
  max-width: 820px;
  margin: 0 auto;
  padding: 1.1rem 2rem;
  background: var(--color-page-bg);
  border: 1px solid var(--primitive-paper-dark);
  border-radius: var(--radius-subtle);
  margin-top: 1.2rem;
}

.page-intro {
  font-size: 1.02rem;
  color: var(--color-text-secondary);
  line-height: 1.95;
  text-indent: 0 !important;
  text-align: center !important;
}

/* 表格古风样式 */
.article-body table, .page-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2.2rem 0;
  font-size: 0.96rem;
  background: var(--color-card-bg);
}

.article-body th, .page-body th {
  background: var(--primitive-paper-aged);
  color: var(--color-text-title);
  font-weight: 600;
  padding: 0.85rem 1.1rem;
  border: 1px solid var(--primitive-paper-dark);
  text-align: left;
}

.article-body td, .page-body td {
  padding: 0.85rem 1.1rem;
  border: 1px solid var(--primitive-paper-dark);
  color: var(--color-text-secondary);
  vertical-align: top;
}

.article-body tr:nth-child(even), .page-body tr:nth-child(even) {
  background-color: var(--color-page-bg);
}

/* 插图 */
.article-body img, .page-body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2.2rem auto;
  border-radius: var(--radius-subtle);
  box-shadow: var(--shadow-book-page);
  border: 1px solid var(--primitive-paper-dark);
}

/* ==========================================================================
   细化扩展组件：师承卡片、方对卡片、五音图解、诗牌笺纸
   ========================================================================== */

/* 1. 师承流派网格 (Lineage Cards) */
.lineage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
}

.lineage-card {
  background: var(--color-page-bg);
  border: 1px solid var(--primitive-paper-dark);
  border-radius: var(--radius-card);
  padding: 1.6rem 1.4rem;
  text-align: center;
  transition: all 0.3s ease;
}

.lineage-card:hover {
  border-color: var(--color-seal-cinnabar);
  transform: translateY(-3px);
  background: #FFFDF9;
}

.lineage-seal {
  display: inline-block;
  font-family: var(--primitive-font-kaiti);
  font-size: 0.8rem;
  color: var(--color-seal-cinnabar);
  border: 1px solid var(--color-seal-cinnabar);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
  margin-bottom: 0.8rem;
}

.lineage-master {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-title);
  margin-bottom: 0.4rem;
}

.lineage-year {
  font-size: 0.82rem;
  color: var(--color-academic-accent);
  margin-bottom: 0.8rem;
}

.lineage-core {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  text-align: justify;
}

/* 2. 方对鉴别心法卡片 (Formula Pair Cards) */
.formula-pair-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.6rem;
  margin: 2rem 0;
}

.formula-pair-card {
  background: var(--color-page-bg);
  border: 1px solid var(--primitive-paper-dark);
  border-radius: var(--radius-card);
  padding: 1.8rem;
  border-top: 3px solid var(--color-academic-accent);
}

.formula-pair-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text-title);
  margin-bottom: 0.6rem;
}

.formula-pair-desc {
  font-size: 0.94rem;
  color: var(--color-text-secondary);
  line-height: 1.85;
  text-indent: 0 !important;
}

/* 3. 五音入五脏图谱 (Five Tones & Organs) */
.five-tones-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin: 2rem 0;
  text-align: center;
}

.tone-card {
  background: var(--color-page-bg);
  border: 1px solid var(--primitive-paper-dark);
  border-radius: var(--radius-subtle);
  padding: 1.3rem 0.8rem;
  transition: all 0.25s ease;
}

.tone-card:hover {
  border-color: var(--color-seal-cinnabar);
  transform: translateY(-3px);
  background: #fff;
}

.tone-char {
  font-family: var(--primitive-font-kaiti);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-seal-cinnabar);
  margin-bottom: 0.4rem;
}

.tone-organ {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-title);
  margin-bottom: 0.3rem;
}

.tone-phase {
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
}

/* 4. 竖排文人名言屏风笺纸 (Vertical Literary Paper) */
.vertical-paper-box {
  background: var(--primitive-paper-aged);
  border: 1px solid var(--primitive-paper-dark);
  border-radius: var(--radius-card);
  padding: 2.2rem 2.5rem;
  margin: 2.5rem 0;
  position: relative;
  text-align: center;
}

.vertical-poem {
  display: flex;
  justify-content: center;
  gap: 2rem;
  font-family: var(--primitive-font-kaiti);
  font-size: 1.28rem;
  color: var(--color-text-title);
  writing-mode: vertical-rl;
  text-orientation: upright;
  margin: 0 auto;
  min-height: 220px;
  line-height: 2;
  letter-spacing: 0.18em;
}

.vertical-poem span {
  border-left: 1px solid rgba(158, 42, 43, 0.15);
  padding-left: 0.8rem;
}

/* ==========================================================================
   文章底部与上下篇翻阅
   ========================================================================== */
.article-footer-box {
  margin-top: 4.5rem;
  padding-top: 2.2rem;
  border-top: 1px solid var(--primitive-paper-dark);
}

.article-stamp-row {
  display: flex;
  justify-content: center;
  gap: 1.2rem;
  margin-bottom: 2.2rem;
}

.red-stamp {
  font-family: var(--primitive-font-kaiti);
  font-size: 0.88rem;
  color: var(--color-seal-cinnabar);
  border: 1px solid var(--color-seal-cinnabar);
  padding: 0.25rem 0.75rem;
  border-radius: 2px;
  background: var(--color-seal-bg-tint);
  letter-spacing: 0.1em;
}

.post-nav-wrapper {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1.8rem;
  padding: 1.5rem 0 0;
}

.post-nav-item {
  display: flex;
  flex-direction: column;
}

.post-nav-item.next {
  text-align: right;
  align-items: flex-end;
}

.nav-label {
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
  margin-bottom: 0.3rem;
  letter-spacing: 0.06em;
}

.nav-title {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--color-text-title);
  line-height: 1.45;
}

.nav-title:hover {
  color: var(--color-seal-cinnabar);
}

.nav-empty {
  font-size: 0.88rem;
  color: var(--color-text-tertiary);
}

.back-to-catalog {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  border: 1px solid var(--primitive-paper-dark);
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-subtle);
  background: var(--color-page-bg);
}

.back-to-catalog:hover {
  border-color: var(--color-seal-cinnabar);
  color: var(--color-seal-cinnabar);
}

/* ==========================================================================
   目录卡片 (Chapter Grid)
   ========================================================================== */
.chapter-grid {
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
  margin-top: 2rem;
}

.chapter-card {
  background: var(--color-page-bg);
  border: 1px solid var(--color-card-border-soft);
  border-radius: var(--radius-subtle);
  padding: 1.6rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.28s ease;
}

.chapter-card:hover {
  border-color: var(--color-seal-cinnabar);
  background: #FFFDF9;
  transform: translateX(5px);
  box-shadow: 0 4px 15px rgba(45, 38, 30, 0.04);
}

.chapter-left {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.chapter-index {
  font-size: 0.78rem;
  color: var(--color-seal-cinnabar);
  font-family: var(--primitive-font-kaiti);
}

.chapter-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text-title);
  letter-spacing: 0.04em;
}

.chapter-author {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.chapter-right {
  font-size: 0.9rem;
  color: var(--color-seal-cinnabar);
  white-space: nowrap;
  padding-left: 1.2rem;
}

/* ==========================================================================
   编年体时间轴 (Timeline)
   ========================================================================== */
.timeline-wrap {
  position: relative;
  padding-left: 2.5rem;
  margin: 3rem 0;
}

.timeline-wrap::before {
  content: '';
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 11px;
  width: 1px;
  background-color: var(--primitive-paper-dark);
}

.timeline-node {
  position: relative;
  margin-bottom: 2.2rem;
}

.timeline-node::before {
  content: '';
  position: absolute;
  top: 9px;
  left: -2.5rem;
  transform: translateX(7px);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--color-seal-cinnabar);
  border: 2px solid var(--color-card-bg);
}

.timeline-year {
  font-family: var(--primitive-font-kaiti);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-seal-cinnabar);
  margin-bottom: 0.3rem;
  letter-spacing: 0.04em;
}

.timeline-event {
  font-size: 1.02rem;
  color: var(--color-text-body);
  line-height: 1.85;
}

/* ==========================================================================
   古风页脚 (Footer)
   ========================================================================== */
.ancient-footer {
  background: var(--primitive-paper-aged);
  border-top: 1px solid var(--primitive-paper-dark);
  padding: 3.8rem 1.8rem 3.2rem;
  margin-top: auto;
  text-align: center;
}

.footer-container {
  max-width: 920px;
  margin: 0 auto;
}

.footer-poem {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--primitive-font-kaiti);
  font-size: 1.08rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.9rem;
  letter-spacing: 0.1em;
}

.poem-dot {
  color: var(--color-seal-cinnabar);
  opacity: 0.65;
}

.footer-seal-row {
  display: flex;
  justify-content: center;
  gap: 1.4rem;
  margin-bottom: 1.6rem;
}

.footer-seal {
  font-family: var(--primitive-font-kaiti);
  font-size: 0.82rem;
  color: var(--color-seal-cinnabar);
  border: 1px solid var(--color-seal-cinnabar);
  padding: 0.22rem 0.65rem;
  border-radius: 2px;
  background: var(--color-seal-bg-tint);
  letter-spacing: 0.08em;
}

.footer-copy {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--color-text-title);
  margin-bottom: 0.45rem;
  letter-spacing: 0.06em;
}

.footer-note {
  font-size: 0.88rem;
  color: var(--color-text-tertiary);
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 2.2rem;
  right: 2.2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-card-bg);
  border: 1px solid var(--primitive-paper-dark);
  color: var(--color-text-title);
  font-size: 1.25rem;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-book-page);
  z-index: 90;
  transition: all 0.25s ease;
}

.back-to-top:hover {
  background: var(--color-seal-cinnabar);
  color: #fff;
  border-color: var(--color-seal-cinnabar);
}

/* ==========================================================================
   响应式移动端适配 (Responsive Mobile)
   ========================================================================== */
@media (max-width: 900px) {
  .realm-cards {
    grid-template-columns: 1fr;
    gap: 1.3rem;
  }
  .lineage-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
  .formula-pair-grid {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
  .five-tones-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .desktop-nav {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .main-wrapper {
    padding: 1.4rem 1rem 3.5rem;
  }

  .article-container, .page-container {
    padding: 2.2rem 1.3rem 2.8rem;
  }

  .hero-image-wrap {
    height: 230px;
  }

  .hero-caption {
    padding: 1.3rem 1.1rem 2.2rem;
    margin-top: -2.8rem;
  }

  .hero-title {
    font-size: 1.7rem;
  }

  .hero-motto {
    font-size: 1.08rem;
  }

  .hero-motto-box {
    padding: 1.1rem 1.3rem;
  }

  .article-title, .page-title {
    font-size: 1.6rem;
  }

  .article-body p, .page-body p {
    text-indent: 2em;
    font-size: 1.02rem;
    line-height: 2.05;
  }

  .article-body table, .page-body table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .five-tones-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .vertical-poem {
    writing-mode: horizontal-tb;
    min-height: auto;
    flex-direction: column;
    gap: 0.6rem;
  }

  .vertical-poem span {
    border-left: none;
    border-bottom: 1px dashed rgba(158, 42, 43, 0.2);
    padding-bottom: 0.4rem;
  }

  .post-nav-wrapper {
    grid-template-columns: 1fr;
    gap: 1.2rem;
    text-align: center;
  }

  .post-nav-item.next {
    text-align: center;
    align-items: center;
  }

  .chapter-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.9rem;
  }

  .footer-poem {
    flex-direction: column;
    gap: 0.35rem;
  }

  .poem-dot {
    display: none;
  }
}