/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:    #1d4ed8;
  --primary-h:  #1e40af;
  --accent:     #3b82f6;
  --bg:         #f1f5f9;
  --surface:    #ffffff;
  --border:     #e2e8f0;
  --text:       #1e293b;
  --muted:      #64748b;
  --danger:     #dc2626;
  --success:    #16a34a;
  --nav-bg:     #0f172a;
  --nav-h:      #1e293b;
  --sidebar-w:  280px;
  --radius:     8px;
  --shadow:     0 1px 4px rgba(0,0,0,.08);
  --shadow-md:  0 4px 16px rgba(0,0,0,.1);
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
               'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-h); }
img { max-width: 100%; height: auto; }

/* ─── Header / Nav ─── */
.site-header {
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0 16px;
}

.nav-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  height: 56px;
  gap: 16px;
  background: var(--nav-bg);
  box-shadow: 0 2px 8px rgba(0,0,0,.3);
  min-width: 0;
}

.nav-marquee {
  flex: 1;
  min-width: 0;
  max-width: 360px;
  overflow: hidden;
  align-self: center;
  line-height: 1;
}

/* ─── Site-wide floating side ads ─── */
.site-float-ad {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 50;
  display: none;
  max-width: 160px;
}
/* Hug the 1160px container: 580px = half container, 8px gap */
.site-float-ad-left  { right: calc(50% + 580px + 8px); }
.site-float-ad-right { left:  calc(50% + 580px + 8px); }
@media (min-width: 1500px) {
  .site-float-ad { display: block; }
}

.logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
  letter-spacing: -0.3px;
  flex: 0 0 auto;
}
.logo span { color: var(--accent); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
  flex: 1 1 auto;
  flex-wrap: nowrap;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-links a {
  color: #cbd5e1;
  display: block;
  padding: 6px 9px;
  border-radius: 6px;
  font-size: .84rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background .15s, color .15s;
}
.nav-links a:hover,
.nav-links a.active { background: var(--nav-h); color: #fff; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  flex: 0 0 auto;
}

.nav-btn {
  background: var(--primary);
  color: #fff !important;
  padding: 5px 14px;
  border-radius: 6px;
  font-size: .83rem;
  font-weight: 600;
  transition: background .15s;
}
.nav-btn:hover { background: var(--primary-h) !important; color: #fff; }

.nav-user { color: #94a3b8; font-size: .83rem; }

/* Hamburger */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: #fff; margin: 5px 0; border-radius: 2px; transition: .3s; }

/* ─── Layout ─── */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 20px 20px 28px;
}

.layout-two {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-w);
  gap: 28px;
  align-items: start;
}

/* ─── Cards ─── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-head {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-head h2, .card-head h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}
.card-head .badge {
  margin-left: auto;
  background: var(--primary);
  color: #fff;
  font-size: .72rem;
  padding: 2px 8px;
  border-radius: 20px;
}

.card-body { padding: 20px; }

/* ─── Hero / Homepage ─── */
.hero {
  background: linear-gradient(135deg, var(--nav-bg) 0%, #1e3a5f 100%);
  color: #fff;
  padding: 48px 20px;
  text-align: center;
}
.hero h1 { font-size: 2rem; font-weight: 800; margin-bottom: 10px; }
.hero p  { color: #94a3b8; font-size: 1rem; }

/* ─── Category grid on homepage ─── */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.cat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 8px;
  text-align: center;
  transition: box-shadow .15s, transform .15s;
  display: block;
  color: var(--text);
}
.cat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); color: var(--primary); }
.cat-card .cat-icon { font-size: 1.35rem; margin-bottom: 4px; display: block; }
.cat-card h3 { font-size: .8rem; font-weight: 600; margin-bottom: 0; }
.cat-card p  { display: none; }

/* ─── Homepage 2-col (latest + recommended) ─── */
.home-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}

/* ─── 6-category 3×2 section grid ─── */
.cat-section-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}
.cat-section-card {
  display: flex;
  flex-direction: column;
  min-height: 210px;
}
.cat-section-list {
  padding: 0 16px;
  flex: 1;
}
.cat-section-list li {
  padding: 8px 0;
  font-size: .85rem;
  border-bottom: 1px solid var(--border);
}
.cat-section-list li:last-child { border-bottom: none; }

/* ─── Section title ─── */
.section-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
}

/* ─── Article list (text only, bold title) ─── */
.article-list { list-style: none; }

.article-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.article-list li:last-child { border-bottom: none; }

.article-list .art-title {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 5px;
  line-height: 1.4;
  transition: color .15s;
}
.article-list .art-title:hover { color: var(--primary); }

.article-list .art-meta {
  font-size: .78rem;
  color: var(--muted);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.art-cat-badge {
  background: #eff6ff;
  color: var(--primary);
  font-size: .72rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

/* ─── Compact article list (homepage latest/recommended) ─── */
.article-list.compact-list li {
  padding: 7px 0;
}
.article-list.compact-list .art-title {
  font-size: .9rem;
  font-weight: 600;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.article-list.compact-list .art-meta {
  font-size: .72rem;
  gap: 6px;
}

/* ─── Article content page ─── */
.article-header {
  margin-bottom: 24px;
}
.article-header h1 {
  font-size: 1.7rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 10px;
}
.article-meta {
  display: flex;
  gap: 16px;
  font-size: .83rem;
  color: var(--muted);
  flex-wrap: wrap;
}

.article-body {
  font-size: .97rem;
  line-height: 1.85;
  color: #334155;
}
.article-body h2, .article-body h3 { margin: 20px 0 10px; color: var(--text); font-weight: 700; }
.article-body p  { margin-bottom: 14px; }
.article-body img{ border-radius: 6px; margin: 12px 0; }
.article-body ul, .article-body ol { padding-left: 24px; margin-bottom: 14px; }
.article-body pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 16px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: .88rem;
  margin-bottom: 14px;
}
.article-body code { background: #f1f5f9; padding: 1px 5px; border-radius: 4px; font-size: .88em; }
.article-body pre code { background: none; padding: 0; }

/* Download box */
.download-box {
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-top: 28px;
  text-align: center;
}
.download-box h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.btn-download {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 11px 32px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 1rem;
  transition: background .2s;
  border: none;
  cursor: pointer;
}
.btn-download:hover { background: var(--primary-h); color: #fff; }

.login-prompt {
  background: #fef9c3;
  border: 1px solid #fde047;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-top: 28px;
  text-align: center;
  font-size: .9rem;
  color: #713f12;
}
.login-prompt a { color: var(--primary); font-weight: 600; }

/* ─── Sidebar ─── */
.sidebar { display: flex; flex-direction: column; gap: 20px; }

.sidebar .card-body { padding: 16px; }

.sidebar-list { list-style: none; }
.sidebar-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: .88rem;
  line-height: 1.4;
}
.sidebar-list li:last-child { border-bottom: none; }
.sidebar-list a { color: var(--text); font-weight: 600; }
.sidebar-list a:hover { color: var(--primary); }
.sidebar-list .meta { font-size: .73rem; color: var(--muted); display: block; }

.announce-item {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: .88rem;
}
.announce-item:last-child { border-bottom: none; }
.announce-item strong { display: block; margin-bottom: 2px; color: var(--text); }
.announce-item p { color: var(--muted); font-size: .82rem; }

.contact-block { font-size: .88rem; color: var(--muted); line-height: 1.8; }

/* ─── Random articles row ─── */
.random-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
}
.random-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 14px;
  border: 1px solid var(--border);
  transition: box-shadow .2s;
}
.random-card:hover { box-shadow: var(--shadow-md); }
.random-card a { color: var(--text); font-weight: 600; font-size: .9rem; line-height: 1.4; }
.random-card a:hover { color: var(--primary); }
.random-card .meta { font-size: .73rem; color: var(--muted); margin-top: 4px; }

/* ─── Pagination ─── */
.pager {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 24px;
  justify-content: center;
}
.pager a, .pager span {
  display: inline-block;
  min-width: 36px;
  text-align: center;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: .88rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  transition: background .15s;
}
.pager a:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.pager .current { background: var(--primary); color: #fff; border-color: var(--primary); }
.pager .disabled { opacity: .4; cursor: default; }

/* ─── Friendly links ─── */
.friendly-links {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 24px 20px;
}
.friendly-links .inner {
  max-width: 1160px;
  margin: 0 auto;
}
.friendly-links h4 { font-size: .9rem; color: var(--muted); margin-bottom: 12px; font-weight: 600; }
.friendly-links ul { list-style: none; display: flex; gap: 16px; flex-wrap: wrap; }
.friendly-links a { font-size: .85rem; color: var(--muted); transition: color .15s; }
.friendly-links a:hover { color: var(--primary); }

/* ─── Footer ─── */
.site-footer {
  background: var(--nav-bg);
  color: #64748b;
  text-align: center;
  padding: 20px;
  font-size: .82rem;
  max-width: 1160px;
  margin: 0 auto;
}
.site-footer a { color: #94a3b8; }

/* ─── Login / User pages ─── */
.auth-wrap {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}
.auth-box {
  background: var(--surface);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  width: 100%;
  max-width: 420px;
  padding: 36px;
}
.auth-box h1 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 6px;
  text-align: center;
}
.auth-box .subtitle { text-align: center; color: var(--muted); font-size: .88rem; margin-bottom: 24px; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; font-size: .88rem; margin-bottom: 6px; color: var(--text); }
.form-group input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: .95rem;
  outline: none;
  transition: border .2s, box-shadow .2s;
}
.form-group input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,.15); }

.captcha-row { display: flex; gap: 10px; align-items: center; }
.captcha-row input { flex: 1; }
.captcha-text {
  background: #0f172a;
  color: #38bdf8;
  padding: 9px 14px;
  border-radius: 6px;
  font-family: monospace;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 2px;
  white-space: nowrap;
}

.btn-submit {
  width: 100%;
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 11px;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background .2s;
  margin-top: 8px;
}
.btn-submit:hover { background: var(--primary-h); }

.alert {
  padding: 10px 14px;
  border-radius: 6px;
  font-size: .88rem;
  margin-bottom: 16px;
}
.alert-error { background: #fef2f2; border: 1px solid #fecaca; color: #dc2626; }
.alert-success { background: #f0fdf4; border: 1px solid #bbf7d0; color: #166534; }
.alert-warning { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; }

/* User center */
.user-center { max-width: 560px; margin: 40px auto; padding: 0 20px; }
.user-info-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
}
.user-info-card h2 { font-size: 1.2rem; font-weight: 800; margin-bottom: 20px; }
.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: .92rem;
}
.info-row:last-of-type { border-bottom: none; }
.info-row .label { color: var(--muted); }
.info-row .value { font-weight: 600; }
.info-row .expired { color: var(--danger); }

/* ─── Breadcrumb ─── */
.breadcrumb {
  font-size: .82rem;
  color: var(--muted);
  margin-bottom: 18px;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ─── Category page header ─── */
.cat-header {
  background: var(--bg);
  padding: 0 16px;
}
.cat-header .inner {
  max-width: 1160px;
  margin: 0 auto;
  background: linear-gradient(135deg, var(--primary) 0%, #1e40af 100%);
  color: #fff;
  padding: 28px 24px;
}
.cat-header h1 { font-size: 1.6rem; font-weight: 800; }
.cat-header p  { color: #bfdbfe; font-size: .88rem; margin-top: 4px; }

/* ─── Mobile ─── */
@media (max-width: 900px) {
  .layout-two { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .cat-grid { grid-template-columns: repeat(3, 1fr); }
  .random-grid { grid-template-columns: repeat(2, 1fr); }
  .home-two-col { grid-template-columns: 1fr; }
  .cat-section-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    padding: 12px 20px;
    gap: 2px;
    z-index: 99;
    overflow: visible;
  }
}

@media (max-width: 640px) {
  .cat-grid { grid-template-columns: repeat(3, 1fr); }
  .random-grid { grid-template-columns: 1fr; }
  .cat-section-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.5rem; }
  .article-header h1 { font-size: 1.35rem; }
  .logo { font-size: 1.1rem; }
  .nav-inner { padding: 0 14px; gap: 10px; }
}