/* ============================================
   丁香网 lilacbook.com — 全局样式
   设计：简洁 / 清新 / 优雅 / 书卷气
   配色：浅色系为主，呼应"丁香"花草意象
   ============================================ */

:root {
  /* 丁香主色系 —— 清雅淡紫 + 柔和中性 */
  --lilac: #8b7fa8;          /* 丁香紫（主色） */
  --lilac-light: #e8e4f0;    /* 淡紫（浅底） */
  --lilac-very-light: #f6f4fa;/* 极浅紫（页面底） */
  --green: #7ba88f;          /* 草木绿（点缀） */
  --ink: #1f1b26;            /* 墨色（正文）— 近纯黑，高对比 */
  --ink-light: #3f3a48;      /* 淡墨（次要文字）— 明显加深，保证清晰 */
  --line: #e6e2ec;           /* 分隔线 */
  --white: #ffffff;

  /* 字体 —— 书卷气 */
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;   /* 衬线（标题/正文） */
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif; /* 无衬线（UI） */

  --radius: 10px;
  --shadow: 0 2px 12px rgba(80, 70, 100, 0.06);
  --maxw: 1080px;
}

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

body {
  font-family: var(--font-sans);
  background: var(--lilac-very-light);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

/* ============ 布局 ============ */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ============ 头部 ============ */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(8px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; max-width: var(--maxw); margin: 0 auto; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-icon {
  width: 36px; height: 36px; border-radius: 9px;
  background: linear-gradient(135deg, var(--lilac), var(--green));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 18px;
}
.brand-name {
  font-family: var(--font-serif); font-size: 20px; font-weight: 600;
  color: var(--ink); letter-spacing: 1px;
}
.brand-name em { color: var(--lilac); font-style: normal; }

/* 顶部搜索框 —— 显眼、方便 */
.header-search { flex: 1; max-width: 420px; }
.header-search form { display: flex; }
.header-search input {
  flex: 1; padding: 10px 16px; border: 1px solid var(--line);
  border-radius: 8px 0 0 8px; font-size: 14px; outline: none;
  background: var(--lilac-very-light); color: var(--ink);
  transition: border-color .2s;
}
.header-search input:focus { border-color: var(--lilac); background: #fff; }
.header-search button {
  padding: 10px 18px; border: none; border-radius: 0 8px 8px 0;
  background: var(--lilac); color: #fff; cursor: pointer; font-size: 14px;
  transition: background .2s;
}
.header-search button:hover { background: var(--green); }

/* 顶栏标语 */
.header-tagline {
  flex: 1; text-align: center; color: var(--ink-light); font-size: 14px;
  font-family: var(--font-serif); letter-spacing: 1px; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}

.header-nav { display: flex; gap: 20px; }
.header-nav a {
  text-decoration: none; color: var(--ink-light); font-size: 14px;
  padding: 6px 0; border-bottom: 2px solid transparent; transition: all .2s;
}
.header-nav a:hover { color: var(--lilac); border-bottom-color: var(--lilac); }

/* ============ 首页 ============ */
.hero {
  text-align: center; padding: 60px 24px 40px;
  background: linear-gradient(180deg, var(--lilac-very-light), var(--white));
}
/* 极简搜索落地页（仅顶栏+搜索+底栏） */
.hero-mini { padding: 12vh 24px; display: flex; align-items: center; }
.hero-mini .container { width: 100%; }
.hero-mini .hero-sub { margin-top: -4px; margin-bottom: 8px; letter-spacing: 1px; }
.hero-mini .hero-note { margin-top: 22px; font-size: 14px; }
.hero-mini .hero-search { max-width: 620px; margin: 0 auto; }
.hero-mini .hero-search input { padding: 16px 24px; font-size: 16px; border-radius: 14px 0 0 14px; }
.hero-mini .hero-search button { padding: 16px 30px; font-size: 16px; border-radius: 0 14px 14px 0; }
.hero h1 {
  font-family: var(--font-serif); font-size: 38px; font-weight: 600;
  color: var(--ink); margin-bottom: 14px; letter-spacing: 2px;
}
.hero h1 span { color: var(--lilac); }
.hero p { color: var(--ink-light); font-size: 16px; max-width: 620px; margin: 0 auto; }
.hero .hero-count {
  margin-top: 18px; display: inline-block; padding: 8px 20px;
  background: var(--lilac-light); color: var(--lilac);
  border-radius: 20px; font-size: 14px;
}

/* hero 搜索框（首页搜索主入口） */
.hero-search { max-width: 560px; margin: 26px auto 10px; position: relative; }
.hero-search form { display: flex; }
.hero-search input {
  flex: 1; padding: 14px 20px; border: 2px solid var(--line); border-radius: 12px 0 0 12px;
  font-size: 15px; outline: none; background: #fff; color: var(--ink);
  transition: border-color .2s; box-shadow: var(--shadow);
}
.hero-search input:focus { border-color: var(--lilac); }
.hero-search input::placeholder { color: var(--ink-light); }
.hero-search button {
  padding: 14px 26px; border: none; border-radius: 0 12px 12px 0; background: var(--lilac);
  color: #fff; font-size: 15px; cursor: pointer; transition: background .2s;
}
.hero-search button:hover { background: var(--green); }

.section { margin: 40px auto; }
.section-title {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 20px;
}
.section-title h2 {
  font-family: var(--font-serif); font-size: 24px; font-weight: 600;
  color: var(--ink); letter-spacing: 1px;
}
.section-title a { color: var(--lilac); font-size: 14px; text-decoration: none; }
.section-title a:hover { text-decoration: underline; }

/* 文献卡片 */
.paper-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }
.paper-card {
  background: var(--white); border-radius: var(--radius); padding: 22px 24px;
  box-shadow: var(--shadow); border: 1px solid var(--line);
  transition: transform .2s, box-shadow .2s; display: flex; flex-direction: column;
}
.paper-card:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(80,70,100,.1); }
.paper-card .pc-title {
  font-family: var(--font-serif); font-size: 16px; font-weight: 600;
  color: var(--ink); margin-bottom: 10px; line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.paper-card .pc-title a { color: inherit; text-decoration: none; }
.paper-card .pc-title a:hover { color: var(--lilac); }
.paper-card .pc-summary {
  font-size: 13px; color: var(--ink-light); margin-bottom: 14px;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.paper-card .pc-meta {
  margin-top: auto; display: flex; align-items: center; justify-content: space-between;
  font-size: 12px; color: var(--ink-light);
}
.paper-card .pc-tag {
  background: var(--lilac-light); color: var(--lilac);
  padding: 3px 10px; border-radius: 12px; font-size: 12px;
}
.paper-card .pc-dl { color: var(--green); text-decoration: none; font-size: 13px; }
.paper-card .pc-dl:hover { text-decoration: underline; }

/* ============ 分类导航 ============ */
.cat-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.cat-chip {
  display: inline-block; padding: 8px 16px; background: var(--white);
  border: 1px solid var(--line); border-radius: 20px; color: var(--ink-light);
  text-decoration: none; font-size: 14px; transition: all .2s;
}
.cat-chip:hover { border-color: var(--lilac); color: var(--lilac); background: var(--lilac-very-light); }
.cat-chip .cnt { color: var(--lilac); margin-left: 4px; font-size: 12px; }

/* ============ 文献列表 ============ */
.list-page { padding: 40px 0; }
.list-page h1 {
  font-family: var(--font-serif); font-size: 28px; margin-bottom: 24px;
  display: flex; align-items: center; gap: 12px;
}
.list-page h1 .cat-badge {
  background: var(--lilac); color: #fff; font-size: 13px; padding: 3px 12px; border-radius: 14px;
}
.paper-list { display: flex; flex-direction: column; gap: 14px; }
.paper-row {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 22px; transition: box-shadow .2s;
}
.paper-row:hover { box-shadow: var(--shadow); }
.paper-row .pr-title { font-family: var(--font-serif); font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.paper-row .pr-title a { color: var(--ink); text-decoration: none; }
.paper-row .pr-title a:hover { color: var(--lilac); }
.paper-row .pr-summary { font-size: 13px; color: var(--ink-light); margin-bottom: 10px; }
.paper-row .pr-foot { display: flex; gap: 16px; font-size: 12px; color: var(--ink-light); align-items: center; }
.paper-row .pr-cat { color: var(--lilac); }

/* ============ 文献详情 ============ */
.detail { padding: 40px 0; }
.detail-card {
  background: var(--white); border-radius: var(--radius); padding: 32px;
  border: 1px solid var(--line); box-shadow: var(--shadow);
}
.detail-card h1 {
  font-family: var(--font-serif); font-size: 26px; line-height: 1.6;
  margin-bottom: 14px; color: var(--ink);
}
.detail-meta { font-size: 13px; color: var(--ink-light); margin-bottom: 24px; line-height: 2; }
.detail-meta strong { color: var(--ink); font-weight: 500; }
.detail-block { margin-bottom: 24px; }
.detail-block h3 {
  font-family: var(--font-serif); font-size: 17px; color: var(--ink); margin-bottom: 10px;
  padding-left: 12px; border-left: 3px solid var(--lilac);
}
.detail-block p { font-size: 14px; color: var(--ink-light); line-height: 1.9; }
.cn-summary {
  background: var(--lilac-very-light); border-radius: 8px; padding: 18px 22px;
  font-size: 14px; line-height: 1.9; color: var(--ink);
}
.cn-summary .cn-label { color: var(--lilac); font-weight: 600; margin-bottom: 6px; }
.detail-actions { display: flex; gap: 14px; margin-top: 10px; }
.btn {
  display: inline-block; padding: 12px 28px; border-radius: 8px;
  font-size: 15px; text-decoration: none; transition: all .2s; border: none; cursor: pointer;
}
.btn-primary { background: var(--lilac); color: #fff; }
.btn-primary:hover { background: var(--green); }
.btn-ghost { background: transparent; border: 1px solid var(--line); color: var(--ink-light); }
.btn-ghost:hover { border-color: var(--lilac); color: var(--lilac); }

/* ===== 详情页新增样式 ===== */
/* 两栏布局：左侧主内容 + 右侧作者卡片 */
.detail-2col { display: flex; gap: 28px; align-items: flex-start; }
.detail-main { flex: 1; min-width: 0; }
.detail-side { width: 300px; flex-shrink: 0; }
@media (max-width: 860px) {
  .detail-2col { flex-direction: column; }
  .detail-side { width: 100%; }
}
/* 作者卡片 */
.author-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); position: sticky; top: 84px;
}
.author-card h3 {
  font-family: var(--font-serif); font-size: 17px; color: var(--ink);
  margin-bottom: 16px; padding-left: 12px; border-left: 3px solid var(--lilac);
}
.author-list { display: flex; flex-direction: column; gap: 16px; }
.author-item {
  padding-bottom: 14px; border-bottom: 1px dashed var(--line);
}
.author-item:last-child { border-bottom: none; padding-bottom: 0; }
.author-name { font-family: var(--font-serif); font-size: 15px; font-weight: 600; color: var(--ink); }
.author-pos { font-size: 12px; color: var(--lilac); margin-top: 2px; }
.author-aff { font-size: 13px; color: var(--ink-light); margin-top: 4px; line-height: 1.6; }
.author-area { font-size: 13px; color: var(--ink-light); margin-top: 4px; line-height: 1.6; }
.author-stats { font-size: 12px; color: var(--ink-light); margin-top: 6px; display: flex; gap: 14px; }
/* 标题：中文为主，英文为辅 */
.title-cn { display: block; }
.title-en-sub {
  display: block; margin-top: 8px; font-size: 15px; font-weight: 400;
  color: var(--ink-light); line-height: 1.7;
}
.title-en-sm { display: block; font-size: 13px; font-weight: 400; color: var(--ink-light); margin-top: 4px; line-height: 1.6; }
/* 详情页分类标签（小实心紫 chip，区别于浏览页的大chip） */
.detail-cat {
  display: inline-block; background: var(--lilac-very-light); color: var(--lilac);
  font-size: 13px; padding: 4px 14px; border-radius: 14px; text-decoration: none;
  margin: 0 6px 6px 0; transition: all .15s;
}
.detail-cat:hover { background: var(--lilac); color: #fff; }
/* 来源类型徽标（预印本 preprint / 期刊 journal 等） */
.src-badge {
  display: inline-block; background: #F1F5F9; color: #64748B;
  font-size: 12px; padding: 2px 10px; border-radius: 10px;
  font-weight: 500; vertical-align: middle; margin-left: 6px;
  border: 1px solid #E2E8F0;
}
.src-badge.preprint { background: #FEF3C7; color: #92400E; border-color: #FDE68A; }
.src-badge.journal { background: #DCFCE7; color: #166534; border-color: #BBF7D0; }
.src-badge.book { background: #EDE9FE; color: #5B21B6; border-color: #DDD6FE; }
/* 列表页小号徽标 */
.pr-badge {
  display: inline-block; font-size: 11px; padding: 1px 8px; border-radius: 8px;
  font-weight: 500; vertical-align: middle; margin-left: 6px;
  background: #FEF3C7; color: #92400E; border: 1px solid #FDE68A;
}
/* 引用/下载统计 */
.detail-stats { margin-top: 10px; font-size: 13px; color: var(--ink-light); display: flex; gap: 20px; }
/* 7个 AI 字段 */
.detail-ai { margin-bottom: 24px; display: flex; flex-direction: column; gap: 10px; }
.ai-item { font-size: 14px; color: var(--ink-light); line-height: 1.8; }
.ai-tag {
  display: inline-block; background: var(--lilac-very-light); color: var(--lilac);
  font-size: 12px; padding: 2px 10px; border-radius: 10px; margin-right: 10px; font-weight: 500;
}
/* 原文摘要折叠 */
.abstract-toggle summary {
  cursor: pointer; color: var(--lilac); font-size: 14px; margin-bottom: 10px;
}
.abstract-toggle summary:hover { text-decoration: underline; }
.abstract-text {
  background: var(--lilac-very-light); border-radius: 8px; padding: 16px 20px;
  font-size: 13px; line-height: 1.8; color: var(--ink-light); font-family: var(--font-serif);
}
/* 相关文献 */
.detail-related { margin-top: 32px; }
.detail-related h3 {
  font-family: var(--font-serif); font-size: 19px; color: var(--ink); margin-bottom: 16px;
  padding-left: 12px; border-left: 3px solid var(--lilac);
}

/* ============ 搜索页 ============ */
.search-hero { text-align: center; padding: 50px 24px 30px; }
.search-hero .big-search { max-width: 640px; margin: 0 auto; position: relative; }
.search-hero .big-search form { display: flex; }
.search-hero .big-search input {
  flex: 1; padding: 14px 20px; border: 2px solid var(--line); border-radius: 10px 0 0 10px;
  font-size: 16px; outline: none; background: #fff;
}
.search-hero .big-search input:focus { border-color: var(--lilac); }
.search-hero .big-search button {
  padding: 14px 26px; border: none; border-radius: 0 10px 10px 0; background: var(--lilac);
  color: #fff; font-size: 16px; cursor: pointer;
}
.search-hero .big-search button:hover { background: var(--green); }
.search-count { text-align: center; color: var(--ink-light); font-size: 14px; margin: 10px 0 30px; }

/* ============ 页脚 ============ */
.site-footer {
  border-top: 1px solid var(--line); padding: 32px 24px; margin-top: 60px;
  background: var(--white); text-align: center; color: var(--ink-light); font-size: 13px;
}
.site-footer .footer-brand { font-family: var(--font-serif); font-size: 16px; color: var(--ink); margin-bottom: 8px; }
.site-footer a { color: var(--lilac); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* 搜索联想下拉 */
.suggest-box {
  display: none; position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,.08); z-index: 999; overflow: hidden;
  max-height: 320px; overflow-y: auto;
}
.suggest-item {
  padding: 12px 16px; cursor: pointer; font-size: 14px; color: var(--ink);
  border-bottom: 1px solid var(--line); transition: background .15s;
}
.suggest-item:last-child { border-bottom: none; }
.suggest-item:hover { background: var(--lilac-very-light); }
.suggest-item .sg-title { display: block; line-height: 1.5; }

/* 空结果引导 */
.empty-result { text-align: center; padding: 40px 0 60px; }
.empty-result .er-msg { color: var(--ink-light); font-size: 15px; margin-bottom: 24px; }
.empty-result .er-keywords { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }

/* ============ 分页 ============ */
.pagination { display: flex; justify-content: center; gap: 8px; margin: 30px 0; }
.pagination a, .pagination span {
  padding: 8px 14px; border: 1px solid var(--line); border-radius: 6px;
  color: var(--ink-light); text-decoration: none; font-size: 14px; background: #fff;
}
.pagination a:hover { border-color: var(--lilac); color: var(--lilac); }
.pagination .current { background: var(--lilac); color: #fff; border-color: var(--lilac); }

/* ============ 响应式 ============ */
@media (max-width: 768px) {
  .header-inner { flex-wrap: wrap; }
  .header-tagline { display: none; }  /* 窄屏隐藏顶栏标语 */
  .hero h1 { font-size: 28px; }
  .paper-grid { grid-template-columns: 1fr; }
  .detail-card { padding: 20px; }
}