/* 落笔论文网 luobi.com */
:root {
  --ink: #1f2937;
  --muted: #6b7280;
  --accent: #1d4ed8;
  --accent-dark: #1e3a8a;
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e5e7eb;
  --radius: 10px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}
.container { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 头部 */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-size: 20px; font-weight: 700; color: var(--ink); }
.logo span { color: var(--accent); }
.logo em { font-style: normal; font-size: 12px; color: var(--muted); margin-left: 8px; font-weight: 400; }
.site-nav a { margin-left: 22px; font-size: 15px; color: var(--ink); }
.site-nav a.active { color: var(--accent); font-weight: 600; }
.nav-toggle { display: none; background: none; border: none; font-size: 22px; cursor: pointer; }

/* 首屏 */
.hero { background: linear-gradient(180deg, #eef4ff 0%, var(--bg) 100%); padding: 64px 0 48px; text-align: center; }
.hero h1 { font-size: 34px; letter-spacing: 2px; }
.tagline { color: var(--muted); margin: 12px 0 28px; }
.search-box { display: flex; max-width: 620px; margin: 0 auto; }
.search-box input {
  flex: 1; padding: 13px 18px; font-size: 15px;
  border: 1px solid var(--border); border-right: none;
  border-radius: var(--radius) 0 0 var(--radius); outline: none;
}
.search-box input:focus { border-color: var(--accent); }
.search-box button {
  padding: 0 26px; font-size: 15px; color: #fff; background: var(--accent);
  border: none; border-radius: 0 var(--radius) var(--radius) 0; cursor: pointer;
}
.search-box button:hover { background: var(--accent-dark); }
.hero-note { margin-top: 14px; font-size: 13px; color: var(--muted); }

/* 卡片 */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 28px 0; }
.entry-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; color: var(--ink); display: block; transition: box-shadow .15s;
}
.entry-card:hover { text-decoration: none; box-shadow: 0 4px 14px rgba(15, 23, 42, .08); }
.entry-card h3 { font-size: 17px; margin-bottom: 8px; color: var(--accent-dark); }
.entry-card p { font-size: 14px; color: var(--muted); }
.entry-card .more { display: inline-block; margin-top: 12px; font-size: 13px; color: var(--accent); }

/* 章节标题 */
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin: 36px 0 16px; border-bottom: 2px solid var(--accent); padding-bottom: 8px;
}
.section-head h2 { font-size: 20px; }
.section-head a { font-size: 14px; }
.crumb { font-size: 13px; color: var(--muted); }

/* 论文卡片 */
.paper-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 22px; margin-bottom: 14px;
}
.paper-card h3 { font-size: 16px; font-weight: 600; }
.paper-meta { font-size: 13px; color: var(--muted); margin: 6px 0; }
.paper-abstract { font-size: 14px; color: #4b5563; margin: 8px 0; }
.paper-tags { margin-top: 8px; }
.badge {
  display: inline-block; font-size: 12px; color: var(--muted);
  background: #f1f5f9; border-radius: 4px; padding: 1px 8px; margin-right: 6px;
}
.badge-oa { color: #047857; background: #ecfdf5; }

/* 搜索行 */
.search-row { display: flex; gap: 12px; margin: 16px 0; flex-wrap: wrap; }
.search-row input, .search-row select {
  padding: 10px 14px; font-size: 14px;
  border: 1px solid var(--border); border-radius: var(--radius); background: #fff;
}
.search-row input { flex: 1; min-width: 220px; }

/* 指南 */
.guide-list { margin: 20px 0; }
.guide-item {
  display: block; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 24px; margin-bottom: 14px; color: var(--ink);
}
.guide-item:hover { text-decoration: none; box-shadow: 0 4px 14px rgba(15, 23, 42, .08); }
.guide-item h3 { color: var(--accent-dark); margin-bottom: 6px; }
.guide-item p { font-size: 14px; color: var(--muted); }

/* 文章页 */
.article { max-width: 760px; margin: 24px auto 48px; background: var(--card);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 36px 44px; }
.article h1 { font-size: 26px; margin-bottom: 10px; }
.article h2 { font-size: 19px; margin: 28px 0 10px; color: var(--accent-dark); }
.article h3 { font-size: 16px; margin: 20px 0 8px; }
.article p { margin: 10px 0; font-size: 15px; }
.article ul, .article ol { margin: 10px 0 10px 24px; font-size: 15px; }

/* 工具 */
.tool-box { background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px 30px; margin-bottom: 22px; }
.tool-box h3 { color: var(--accent-dark); margin-bottom: 8px; }
.tool-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 16px 0; }
.tool-form label { font-size: 13px; color: var(--muted); display: flex; flex-direction: column; gap: 4px; }
.tool-form input, .tool-form select {
  padding: 9px 12px; font-size: 14px;
  border: 1px solid var(--border); border-radius: 8px;
}
.output-row { display: flex; gap: 12px; align-items: center; }
.output-box {
  flex: 1; background: #f8fafc; border: 1px dashed var(--border);
  border-radius: 8px; padding: 12px 16px; font-size: 14px; min-height: 24px;
}
.copy-btn {
  padding: 10px 20px; background: var(--accent); color: #fff;
  border: none; border-radius: 8px; cursor: pointer; font-size: 14px;
}
.copy-btn:hover { background: var(--accent-dark); }
textarea#countInput {
  width: 100%; height: 140px; padding: 12px; font-size: 14px;
  border: 1px solid var(--border); border-radius: 8px; resize: vertical;
}

.notice {
  background: #fffbeb; border: 1px solid #fde68a; color: #92400e;
  border-radius: var(--radius); padding: 12px 16px; font-size: 13px; margin-top: 18px;
}

/* 页脚 */
.site-footer { border-top: 1px solid var(--border); margin-top: 48px; padding: 28px 0; background: var(--card); }
.site-footer p { font-size: 13px; color: var(--muted); text-align: center; }

/* 分页 */
.pager { display: flex; gap: 6px; justify-content: center; margin: 22px 0; flex-wrap: wrap; }
.page-btn {
  min-width: 38px; padding: 7px 12px; font-size: 14px; cursor: pointer;
  background: #fff; color: var(--ink); border: 1px solid var(--border); border-radius: 8px;
}
.page-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.page-btn.current { background: var(--accent); color: #fff; border-color: var(--accent); cursor: default; }
.page-btn:disabled { opacity: .4; cursor: not-allowed; }
.page-dots { align-self: center; color: var(--muted); }

.oa-check { display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--ink); white-space: nowrap; }

/* 引文网络列表 */
.ref-item { padding: 10px 0; border-bottom: 1px solid var(--border); }
.ref-item:last-child { border-bottom: none; }
.ref-item a { font-size: 14px; }
.ref-item .paper-meta { margin: 2px 0 0; }

/* 质感增强 */
h1, h2, .logo { font-family: Georgia, "Noto Serif SC", "Songti SC", "SimSun", serif; }
.hero h1 { font-size: 40px; letter-spacing: 4px; }
.paper-card { transition: box-shadow .15s, transform .15s; }
.paper-card:hover { box-shadow: 0 6px 18px rgba(15, 23, 42, .07); transform: translateY(-1px); }
.paper-card h3 a { color: var(--ink); }
.paper-card h3 a:hover { color: var(--accent); text-decoration: none; }
#paperList { transition: opacity .15s; }
.search-row input:focus, .search-row select:focus,
.tool-form input:focus, .tool-form select:focus, textarea#countInput:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(29, 78, 216, .12);
}
.article { box-shadow: 0 2px 10px rgba(15, 23, 42, .05); }
.article h2 { padding-left: 12px; border-left: 4px solid var(--accent); }
.section-head h2 { position: relative; }

@media (max-width: 720px) {
  .card-grid { grid-template-columns: 1fr; }
  .tool-form { grid-template-columns: 1fr; }
  .article { padding: 24px 20px; }
  .hero h1 { font-size: 30px; }
  .site-nav { display: none; position: absolute; top: 60px; right: 0; background: #fff;
    border: 1px solid var(--border); border-radius: 0 0 0 var(--radius); padding: 10px 20px; }
  .site-nav.open { display: block; }
  .site-nav a { display: block; margin: 10px 0; }
  .nav-toggle { display: block; }
}