/* NMT Communications — OJS academic_free 蓝色学术风格（自包含，无外部资源） */
:root {
  --blue: #1a4f8b;
  --blue-dark: #0e3a68;
  --blue-deep: #0a2c50;
  --blue-light: #e8f1fa;
  --accent: #d98e04;
  --text: #1f2937;
  --muted: #64748b;
  --line: #d7e2ee;
  --bg: #f2f6fb;
  --card: #ffffff;
  --radius: 6px;
}
* { box-sizing: border-box; }
html { font-size: 16px; }
body {
  margin: 0;
  font-family: "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); text-decoration: underline; }
img { max-width: 100%; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 16px; }

/* ---------- 顶部刊名条 ---------- */
.top-strip {
  background: var(--blue-deep);
  color: #cfe0f2;
  font-size: .82rem;
  padding: 4px 0;
}
.top-strip .container { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.top-strip a { color: #cfe0f2; }

/* ---------- 刊头 ---------- */
.masthead { background: #fff; border-bottom: 3px solid var(--blue); }
.masthead .container { display: flex; align-items: center; gap: 18px; padding-top: 14px; padding-bottom: 14px; }
.masthead .journal-mark {
  width: 58px; height: 58px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #2e6cb5, var(--blue-deep));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.05rem; letter-spacing: .5px; flex: 0 0 auto;
}
.masthead h1 { margin: 0; font-size: 1.7rem; color: var(--blue-dark); line-height: 1.2; }
.masthead h1 small { display: block; font-size: .95rem; color: var(--muted); font-weight: 500; letter-spacing: 1px; }
.masthead .issn-line { margin-left: auto; text-align: right; font-size: .8rem; color: var(--muted); line-height: 1.5; }

/* ---------- 蓝色导航栏 ---------- */
.navbar { background: var(--blue); box-shadow: 0 2px 4px rgba(10, 44, 80, .25); position: relative; z-index: 5; }
.navbar ul { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; }
.navbar li { margin: 0; }
.navbar a {
  display: block; color: #fff; padding: 12px 20px; font-size: .98rem; font-weight: 500;
  border-right: 1px solid rgba(255, 255, 255, .14);
}
.navbar a:hover { background: var(--blue-dark); text-decoration: none; }
.navbar a.active { background: var(--blue-dark); box-shadow: inset 0 -3px 0 var(--accent); }
.navbar a.lang-switch { background: var(--accent); font-weight: 700; }
.navbar a.lang-switch:hover { background: #b97704; }
.navbar .nav-toggle { display: none; }

/* ---------- 蓝色横幅（DNA 离子图） ---------- */
.hero-banner {
  background: var(--blue-deep) center/cover no-repeat;
  min-height: 190px;
  display: flex; align-items: center;
  border-bottom: 4px solid var(--accent);
}
.hero-banner .container { padding-top: 26px; padding-bottom: 26px; }
.hero-banner .hero-title {
  color: #fff; font-size: 2rem; margin: 0 0 6px; text-shadow: 0 2px 8px rgba(0, 0, 0, .45);
}
.hero-banner .hero-sub { color: #dce9f7; margin: 0; font-size: 1rem; text-shadow: 0 1px 6px rgba(0, 0, 0, .4); }
.hero-banner .hero-badge {
  display: inline-block; margin-top: 12px; background: rgba(10, 44, 80, .72); color: #ffd98a;
  border: 1px solid rgba(255, 217, 138, .5); padding: 4px 12px; border-radius: 20px; font-size: .82rem;
}

/* ---------- 主体两栏 ---------- */
.main-wrap { padding: 26px 0 40px; }
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; }
@media (max-width: 900px) { .layout { grid-template-columns: 1fr; } }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 30px; box-shadow: 0 1px 3px rgba(15, 45, 80, .06);
}
.card + .card { margin-top: 22px; }
.card h2.sec {
  margin: 0 0 16px; font-size: 1.25rem; color: var(--blue-dark);
  border-left: 5px solid var(--accent); padding-left: 10px; line-height: 1.3;
  display: flex; justify-content: space-between; align-items: baseline; gap: 10px;
}
.card h2.sec .more { font-size: .85rem; font-weight: 400; white-space: nowrap; }

/* ---------- 侧边栏 ---------- */
.sidebar .side-box {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  margin-bottom: 20px; overflow: hidden;
}
.sidebar .side-box h3 {
  margin: 0; background: var(--blue); color: #fff; font-size: .98rem; padding: 10px 16px; font-weight: 600;
}
.sidebar .side-box .side-body { padding: 14px 16px; font-size: .92rem; }
.sidebar .side-box ul { margin: 0; padding: 0; list-style: none; }
.sidebar .side-box li { padding: 7px 0; border-bottom: 1px dashed var(--line); font-size: .9rem; }
.sidebar .side-box li:last-child { border-bottom: 0; }
.sidebar .side-box li .date { color: var(--muted); font-size: .78rem; display: block; }
.share-row { display: flex; gap: 8px; }
.share-row a {
  flex: 1; text-align: center; background: var(--blue-light); border: 1px solid var(--line);
  border-radius: 4px; padding: 7px 0; font-size: .82rem; color: var(--blue-dark); font-weight: 600;
}
.share-row a:hover { background: var(--blue); color: #fff; text-decoration: none; }

/* ---------- 文章行 ---------- */
.article-row { padding: 14px 0; border-bottom: 1px solid var(--line); }
.article-row:last-child { border-bottom: 0; }
.article-row .title { font-size: 1.05rem; font-weight: 600; line-height: 1.5; }
.article-row .authors { color: var(--muted); font-size: .88rem; margin-top: 3px; }
.article-row .meta { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; margin-top: 7px; font-size: .82rem; color: var(--muted); }
.badge {
  display: inline-block; padding: 1px 8px; border-radius: 10px; font-size: .72rem; font-weight: 700;
  background: var(--blue-light); color: var(--blue-dark); border: 1px solid var(--line); vertical-align: 2px;
}
.badge.en { background: #fdf3e0; color: #8a5a00; border-color: #f0d9a8; }
.doi-chip { font-family: "SFMono-Regular", Consolas, monospace; font-size: .78rem; color: #0f766e; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; background: var(--blue); color: #fff !important; border: 1px solid var(--blue-dark);
  padding: 8px 18px; border-radius: 4px; font-size: .92rem; cursor: pointer; font-weight: 600;
}
.btn:hover { background: var(--blue-dark); text-decoration: none; }
.btn.ghost { background: #fff; color: var(--blue) !important; border-color: var(--blue); }
.btn.ghost:hover { background: var(--blue-light); }
.btn.accent { background: var(--accent); border-color: #b97704; }
.btn.accent:hover { background: #b97704; }
.btn.sm { padding: 3px 12px; font-size: .82rem; }

/* ---------- 文章详情 ---------- */
.art-head h1 { font-size: 1.5rem; color: var(--blue-deep); line-height: 1.45; margin: 0 0 4px; }
.art-head .title-alt { color: var(--muted); font-size: 1.05rem; margin: 0 0 12px; }
.art-meta { display: flex; flex-wrap: wrap; gap: 6px 20px; font-size: .9rem; color: var(--muted); margin: 6px 0; }
.art-meta b { color: var(--text); font-weight: 600; }
.art-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }
.abstract-box { background: #f7fafd; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 20px; margin: 14px 0; }
.abstract-box h3 { margin: 0 0 8px; color: var(--blue-dark); font-size: 1.02rem; }
details.alt-lang { margin-top: 10px; }
details.alt-lang summary { cursor: pointer; color: var(--blue); font-weight: 600; font-size: .92rem; }
details.alt-lang .alt-body { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line); color: #374151; }
.kw { display: inline-block; background: var(--blue-light); border-radius: 12px; padding: 2px 12px; margin: 0 6px 6px 0; font-size: .82rem; color: var(--blue-dark); }
.cite-box { background: #fffdf5; border: 1px solid #ecdfc0; border-radius: var(--radius); padding: 14px 18px; margin-top: 18px; font-size: .9rem; }
.cite-box h4 { margin: 0 0 6px; color: #8a5a00; font-size: .9rem; }
.cite-box p { margin: 4px 0; }
.doi-widget { border: 1px dashed var(--blue); border-radius: var(--radius); padding: 14px 18px; margin-top: 18px; }
.doi-widget pre { background: #0e2438; color: #b7f4d8; padding: 12px; border-radius: 4px; overflow: auto; font-size: .78rem; max-height: 320px; }
.views-note { font-size: .8rem; color: var(--muted); }

/* ---------- 期次卡片网格 ---------- */
.issue-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 16px; }
.issue-card { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; text-align: center; transition: box-shadow .15s; }
.issue-card:hover { box-shadow: 0 3px 10px rgba(15, 45, 80, .15); }
.issue-card img { width: 100%; height: 190px; object-fit: cover; display: block; background: var(--blue-light); }
.issue-card .issue-info { padding: 8px 10px; font-size: .85rem; }
.issue-card .issue-info b { color: var(--blue-dark); display: block; font-size: .9rem; }
.year-head { margin: 26px 0 12px; color: var(--blue-dark); font-size: 1.1rem; border-bottom: 2px solid var(--blue); padding-bottom: 6px; }
.src-head { margin: 30px 0 6px; color: var(--blue-deep); font-size: 1.3rem; display: flex; align-items: center; gap: 10px; }

/* ---------- 搜索/表单 ---------- */
.search-bar { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0 20px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 9px 12px; border: 1px solid var(--line); border-radius: 4px; font-size: .95rem;
  font-family: inherit; background: #fff; color: var(--text);
}
.field { margin-bottom: 12px; }
.field label { display: block; font-size: .88rem; font-weight: 600; margin-bottom: 4px; color: var(--blue-deep); }
.search-bar .field { margin: 0; flex: 1; min-width: 220px; }
.search-bar .btn { border-radius: 4px; }
input:focus, select:focus, textarea:focus { outline: 2px solid rgba(26, 79, 139, .35); }

/* ---------- flash ---------- */
.flash { padding: 12px 18px; border-radius: var(--radius); margin: 14px 0; font-size: .92rem; }
.flash-ok { background: #ecfdf3; border: 1px solid #a7e8c4; color: #166534; }
.flash-err { background: #fef2f2; border: 1px solid #f5b5b5; color: #991b1b; }

/* ---------- 页脚（深蓝 + 联盟 logo 群） ---------- */
.site-footer { background: var(--blue-deep); color: #b9cde4; margin-top: 40px; }
.site-footer .footer-logos {
  display: flex; flex-wrap: wrap; gap: 22px; align-items: center; justify-content: center;
  padding: 26px 0 10px;
}
.site-footer .footer-logos img { height: 46px; background: #fff; border-radius: 4px; padding: 5px 10px; }
.site-footer .footer-cols { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 26px; padding: 20px 0; }
@media (max-width: 800px) { .site-footer .footer-cols { grid-template-columns: 1fr; } }
.site-footer h4 { color: #fff; margin: 0 0 10px; font-size: .95rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { padding: 3px 0; font-size: .88rem; }
.site-footer a { color: #b9cde4; }
.site-footer a:hover { color: #fff; }
.site-footer .footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .15); text-align: center;
  padding: 14px 16px; font-size: .8rem; color: #93aecb;
}
.footer-journal-name { color: #fff; font-size: 1.15rem; font-weight: 700; margin: 0 0 4px; }

/* ---------- TOC / 列表 ---------- */
.toc-section { margin: 18px 0 6px; color: var(--blue-dark); font-size: 1.05rem; font-weight: 700; }
.crumb { font-size: .84rem; color: var(--muted); margin-bottom: 12px; }
.muted { color: var(--muted); }
.small { font-size: .84rem; }
.center { text-align: center; }
.mt { margin-top: 16px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 800px) { .two-col { grid-template-columns: 1fr; } }
.galley-frame { width: 100%; height: 78vh; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.pdf-cover { border: 1px solid var(--line); border-radius: var(--radius); max-width: 240px; }

/* 统计数字 */
.stats { display: flex; gap: 34px; flex-wrap: wrap; margin: 10px 0 4px; }
.stats .num { font-size: 1.7rem; font-weight: 700; color: var(--blue); }
.stats .lbl { font-size: .82rem; color: var(--muted); }

/* ---------- V6 当期目次（仿中文期刊经典版式） ---------- */
/* 顶部「当期刊次」面板：左封面 + 右信息 */
.issue-hero { display: flex; gap: 26px; flex-wrap: wrap; align-items: flex-start; margin: 6px 0 4px; }
.issue-hero .hero-cover { flex: 0 0 auto; }
.issue-hero .hero-cover img {
  width: 212px; display: block; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(15, 45, 80, .14); background: var(--blue-light);
}
.issue-hero .hero-meta { flex: 1; min-width: 260px; }
.issue-hero .hero-meta p { margin: 6px 0; font-size: .95rem; }
.issue-hero .hero-meta .lbl { color: var(--muted); }
.issue-hero .hero-vol { font-size: 1.08rem; font-weight: 700; color: var(--blue-deep); }
.issue-hero .hero-desc { color: #374151; font-size: .9rem; line-height: 1.75; }
.issue-hero .hero-toc a { font-weight: 700; }

/* 上一期 / 下一期 居中导航 */
.issue-prevnext {
  display: flex; justify-content: center; gap: 48px; margin: 20px 0 4px;
  padding-top: 14px; border-top: 1px solid var(--line); font-size: .95rem; font-weight: 600;
}
.issue-prevnext .disabled { color: #aebbca; font-weight: 400; cursor: default; }

/* 栏目标题：橙色加粗 */
.toc-head { border-top: 2px solid var(--blue); padding-top: 14px; }
.toc-sec { margin: 22px 0 4px; color: var(--accent); font-size: 1.08rem; font-weight: 700; text-align: left; }

/* 目次文章行：左缩略图 + 右信息 */
.toc-row { display: flex; gap: 18px; flex-wrap: wrap; padding: 16px 0; border-bottom: 1px solid var(--line); }
.toc-row:last-child { border-bottom: 0; }
.toc-row .toc-thumb { flex: 0 0 150px; }
.toc-row .toc-thumb img {
  width: 150px; height: 95px; object-fit: cover; display: block;
  border: 1px solid var(--line); border-radius: 4px; background: var(--blue-light);
}
.toc-row .toc-body { flex: 1; min-width: 240px; }
.toc-row .toc-title { font-size: 1.02rem; font-weight: 700; line-height: 1.5; }
.toc-row .toc-title a { color: var(--blue-deep); }
.toc-row .toc-title a:hover { color: var(--blue); }
.toc-row .toc-authors { color: var(--muted); font-size: .88rem; margin-top: 3px; }
.toc-row .toc-cite { font-size: .84rem; color: var(--muted); margin-top: 5px; }
.toc-row .toc-actions { font-size: .87rem; margin-top: 6px; color: var(--muted); }
.toc-row .toc-actions a { font-weight: 600; }
.toc-row .toc-actions .sep { color: #b9c6d4; margin: 0 8px; }

/* 文章页标题下引用行 */
.cite-line { font-size: .88rem; color: var(--muted); margin: 2px 0 10px; }
.cite-line a { color: var(--blue); }