/*
 * 文章页共享样式 — 纸质书阅读风格
 * 所有 spark1/articles/*.html 共用此文件
 * 设计灵感：纸质书籍、杂志的排版美学
 */

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

:root {
  --paper:         #fffdf7;    /* 纸张白（文章卡片） */
  --paper-bg:      #f0ebe0;    /* 桌面暖米色 */
  --paper-shadow:  #e8e0d0;    /* 纸张投影 */
  --ink:           #2c2825;    /* 油墨深棕（正文） */
  --ink-light:     #5a524a;    /* 浅墨（副文字） */
  --ink-faint:     #8a8078;    /* 淡墨（时间/页脚） */
  --link:          #8b4513;    /* 链接棕 */
  --link-hover:    #c4722b;    /* 链接悬停橙 */
  --accent:        #b8860b;    /* 书脊金（装饰线/首字） */
  --border:        #e0d5c1;    /* 页边线 */
  --code-bg:       #f5f0e6;    /* 代码底色 */
  --highlight:     #fef3cd;    /* 高亮黄 */
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Noto Serif SC", "Songti SC", "STSong", Georgia, "Times New Roman", serif;
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 3px,
      rgba(139, 115, 85, 0.015) 3px,
      rgba(139, 115, 85, 0.015) 4px
    ),
    var(--paper-bg);
  color: var(--ink);
  font-size: 18px;
  line-height: 2;
  padding: 24px 16px;
  -webkit-font-smoothing: antialiased;
}

/* 页面晕影 — 书页边缘微暗 */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 9999;
  box-shadow: inset 0 0 120px rgba(0, 0, 0, 0.04);
}

/* ====== 返回链接（书签样式） ====== */
.back {
  display: block;
  max-width: 720px;
  margin: 0 auto 16px;
  color: var(--link);
  text-decoration: none;
  font-size: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  transition: color 0.2s;
}
.back:hover { color: var(--link-hover); }
.back::before { content: '← '; }

/* ====== 文章卡片（纸张） ====== */
article {
  max-width: 720px;
  margin: 0 auto;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 56px 64px;
  box-shadow:
    0 1px 3px rgba(0,0,0,0.06),
    0 8px 24px rgba(0,0,0,0.04),
    inset 0 0 80px rgba(0,0,0,0.01);
  position: relative;
}

/* 纸张顶部金色装饰线（书脊感） */
article::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), #d4a843, var(--accent));
  border-radius: 2px 2px 0 0;
}

/* ====== 标题（章节标题感） ====== */
h1 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 12px;
  color: var(--ink);
  letter-spacing: 0.02em;
}

time {
  display: block;
  color: var(--ink-faint);
  font-size: 13px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.05em;
}

/* ====== 正文标题 ====== */
h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
  margin: 32px 0 12px;
}

h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-light);
  margin: 24px 0 10px;
}

/* ====== 正文段落 ====== */
p {
  margin-bottom: 20px;
  color: var(--ink);
  text-align: justify;
  word-break: break-all;
}

/* 首行缩进（传统书籍排版） */
article p {
  text-indent: 2em;
}

/* 首字下沉（书籍章节开篇） */
article > p:first-of-type::first-letter {
  font-size: 3.2em;
  float: left;
  line-height: 1;
  margin: 4px 8px 0 0;
  color: var(--accent);
  font-weight: 700;
  font-family: "Noto Serif SC", serif;
}

/* 紧跟标题的段落不缩进 */
h1 + p, h2 + p, h3 + p, h4 + p,
time + p, blockquote + p {
  text-indent: 0;
}

/* ====== 链接 ====== */
a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-color: rgba(139, 69, 19, 0.3);
  text-underline-offset: 3px;
  transition: all 0.2s;
}
a:hover {
  color: var(--link-hover);
  text-decoration-color: var(--link-hover);
}

/* ====== 图片 ====== */
img {
  max-width: 100%;
  height: auto;
  border-radius: 2px;
  margin: 24px 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* ====== 代码 ====== */
code {
  background: var(--code-bg);
  color: #8b3a3a;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 15px;
  font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
  border: 1px solid var(--border);
}

pre {
  background: #2d2a24;
  color: #e8e0d0;
  padding: 20px 24px;
  border-radius: 4px;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid #3d3830;
  font-size: 14px;
  line-height: 1.7;
}
pre code {
  background: none;
  color: inherit;
  padding: 0;
  border: none;
  font-size: inherit;
}

/* ====== 引用（书页边注风格） ====== */
blockquote {
  border-left: 3px solid var(--accent);
  margin: 28px 0;
  padding: 16px 24px;
  background: var(--highlight);
  border-radius: 0 4px 4px 0;
  font-style: italic;
  color: var(--ink-light);
}
blockquote p {
  text-indent: 0;
  margin-bottom: 8px;
}

/* ====== 表格 ====== */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 16px;
}

th, td {
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--border);
}

th {
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.03em;
}

tr:nth-child(even) {
  background: var(--code-bg);
}

/* ====== 列表 ====== */
ul, ol {
  margin: 16px 0 20px;
  padding-left: 2em;
  color: var(--ink);
}

li {
  margin-bottom: 8px;
  line-height: 1.9;
}

li::marker {
  color: var(--accent);
}

/* ====== 分割线 ====== */
hr {
  border: none;
  text-align: center;
  margin: 36px 0;
}
hr::after {
  content: '· · ·';
  color: var(--ink-faint);
  letter-spacing: 12px;
  font-size: 18px;
}

/* ====== CTA 盒子（书签卡片风格） ====== */
.cta-box {
  background: var(--paper);
  border: 2px solid var(--accent);
  border-radius: 4px;
  padding: 32px;
  margin: 40px 0;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.cta-box h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--ink);
}
.cta-box p {
  text-indent: 0;
  color: var(--ink-light);
  margin-bottom: 16px;
}
.cta-box a {
  color: var(--link);
  font-weight: 600;
  text-decoration: underline;
}

/* ====== 页脚 ====== */
footer {
  max-width: 720px;
  margin: 32px auto 0;
  text-align: center;
  color: var(--ink-faint);
  font-size: 12px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  padding: 24px;
  border-top: 1px solid var(--border);
}
footer a { color: var(--link); }

/* ================================================================
   文章列表页 — 纸质书目录风格
   ================================================================ */

body.articles-index {
  padding: 0;
  font-size: 16px;
  line-height: 1.8;
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 3px,
      rgba(139, 115, 85, 0.015) 3px,
      rgba(139, 115, 85, 0.015) 4px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 5px,
      rgba(139, 115, 85, 0.01) 5px,
      rgba(139, 115, 85, 0.01) 6px
    ),
    var(--paper-bg);
}

body.articles-index .container {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 40px 60px;
}

/* Hero — 书籍扉页 */
body.articles-index .hero {
  text-align: center;
  padding: 56px 20px 40px;
  margin-bottom: 12px;
  position: relative;
}

body.articles-index .hero::before {
  content: '✦';
  display: block;
  font-size: 18px;
  color: var(--accent);
  margin-bottom: 28px;
  letter-spacing: 24px;
}

body.articles-index .hero::after {
  content: '';
  display: block;
  width: 200px;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--accent) 20%,
    var(--accent) 80%,
    transparent 100%
  );
  margin: 32px auto 0;
}

body.articles-index .hero h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.12em;
  margin-bottom: 14px;
  line-height: 1.4;
  border: none;
  display: block;
  padding: 0;
}

body.articles-index .hero .subtitle {
  font-size: 17px;
  color: var(--ink-light);
  margin-bottom: 20px;
  font-style: italic;
  letter-spacing: 0.06em;
  line-height: 1.6;
}

body.articles-index .hero .tagline {
  display: inline-block;
  padding: 6px 20px;
  border: 1px solid var(--border);
  color: var(--ink-faint);
  font-size: 12px;
  letter-spacing: 0.15em;
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* 装饰分隔符 — 排版花饰 */
.section-ornament {
  text-align: center;
  color: var(--accent);
  font-size: 20px;
  letter-spacing: 16px;
  padding: 24px 0;
  user-select: none;
}

/* 返回书架 */
body.articles-index .nav-home {
  display: inline-block;
  color: var(--link);
  text-decoration: none;
  font-size: 14px;
  margin-bottom: 28px;
  transition: color 0.2s;
  font-family: "Noto Serif SC", serif;
  letter-spacing: 0.03em;
}
body.articles-index .nav-home:hover {
  color: var(--link-hover);
}

/* Cards — 目录条目 */
body.articles-index .cards {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

/* 左侧书脊金线 */
body.articles-index .cards::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(
    180deg,
    var(--accent) 0%,
    var(--border) 50%,
    var(--accent) 100%
  );
  border-radius: 2px;
}

body.articles-index .card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-left: none;
  padding: 28px 32px 28px 36px;
  position: relative;
  transition: all 0.25s ease;
  margin-left: 3px;
}

body.articles-index .card + .card {
  border-top: none;
}

/* 卡片右边缘翻页阴影 */
body.articles-index .card::after {
  content: '';
  position: absolute;
  right: 0;
  top: 8px;
  bottom: 8px;
  width: 6px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(0, 0, 0, 0.02)
  );
  pointer-events: none;
}

body.articles-index .card:hover {
  background: #fffef9;
  z-index: 1;
  box-shadow:
    0 1px 4px rgba(0, 0, 0, 0.04),
    0 4px 16px rgba(0, 0, 0, 0.06),
    inset 0 0 40px rgba(184, 134, 11, 0.02);
}

/* 章节编号（右上角） */
.chapter-num {
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  opacity: 0.7;
}

/* 卡片标题 */
body.articles-index .card-header h2 {
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
  margin-top: 0;
  line-height: 1.5;
  border: none;
  display: block;
  padding: 0;
}

body.articles-index .card-header h2 a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s;
}
body.articles-index .card-header h2 a:hover {
  color: var(--link);
}

/* 日期 */
body.articles-index .card time {
  display: block;
  color: var(--ink-faint);
  font-size: 12px;
  margin-bottom: 10px;
  padding: 0;
  border: none;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0.05em;
}

/* 摘要 */
body.articles-index .card .summary {
  color: var(--ink-light);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 14px;
  text-indent: 0;
}

/* 翻阅此章链接 */
body.articles-index .read-more {
  color: var(--link);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s;
  letter-spacing: 0.06em;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}
body.articles-index .read-more:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

/* Pagination — 书页页码 */
body.articles-index .pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  margin: 48px 0;
  flex-wrap: wrap;
}

body.articles-index .pagination a,
body.articles-index .pagination span {
  padding: 8px 14px;
  font-size: 14px;
  text-decoration: none;
  font-family: "Noto Serif SC", serif;
  transition: all 0.2s;
  border-radius: 2px;
  line-height: 1;
}

body.articles-index .pagination a {
  color: var(--ink-light);
  border: 1px solid var(--border);
  background: var(--paper);
}
body.articles-index .pagination a:hover {
  background: var(--paper-shadow);
  color: var(--ink);
  border-color: var(--accent);
}

body.articles-index .pagination .current {
  background: var(--accent);
  color: var(--paper);
  border: 1px solid var(--accent);
  font-weight: 700;
}

body.articles-index .pagination .disabled {
  color: var(--ink-faint);
  opacity: 0.35;
  border: none;
  background: none;
}

/* 列表页 CTA 盒子 */
body.articles-index .cta-box {
  margin: 0;
}

/* 列表页 footer */
body.articles-index footer {
  max-width: 860px;
  margin: 0 auto;
}

/* ====== 响应式（手机阅读） ====== */
@media (max-width: 768px) {
  body { padding: 12px 8px; font-size: 17px; }
  article { padding: 32px 24px; }
  h1 { font-size: 24px; }
  h2 { font-size: 20px; }
  h3 { font-size: 18px; }

  /* 列表页响应式 */
  body.articles-index .container {
    padding: 24px 16px 40px;
  }
  body.articles-index .hero {
    padding: 32px 12px 28px;
  }
  body.articles-index .hero h1 {
    font-size: 26px;
    letter-spacing: 0.06em;
  }
  body.articles-index .hero .subtitle {
    font-size: 15px;
  }
  body.articles-index .card {
    padding: 20px 18px 20px 24px;
  }
  body.articles-index .card-header h2 {
    font-size: 17px;
  }
  .chapter-num {
    font-size: 10px;
    top: 8px;
    right: 10px;
  }
  body.articles-index .cards::before {
    width: 2px;
  }
  body.articles-index .card {
    margin-left: 2px;
  }
  .section-ornament {
    padding: 16px 0;
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  article { padding: 24px 18px; }
  h1 { font-size: 22px; }

  /* 列表页小屏 */
  body.articles-index .hero h1 {
    font-size: 22px;
  }
  body.articles-index .card {
    padding: 16px 14px 16px 18px;
  }
  body.articles-index .card-header h2 {
    font-size: 16px;
  }
  body.articles-index .pagination {
    gap: 4px;
  }
  body.articles-index .pagination a,
  body.articles-index .pagination span {
    padding: 6px 10px;
    font-size: 13px;
  }
}

/* ====== 打印优化 ====== */
@media print {
  body { background: white; padding: 0; }
  body::after { display: none; }
  article {
    box-shadow: none;
    border: none;
    padding: 0;
    max-width: 100%;
  }
  article::before { display: none; }
  .back { display: none; }
  a { color: var(--ink); text-decoration: underline; }
  pre { border: 1px solid #ccc; }

  /* 列表页打印 */
  body.articles-index { background: white; }
  body.articles-index .cards::before { display: none; }
  body.articles-index .card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
  body.articles-index .card::after { display: none; }
  body.articles-index .nav-home { display: none; }
  body.articles-index .pagination { display: none; }
  body.articles-index .cta-box { display: none; }
  .section-ornament { display: none; }
}