/* ===== 导航首页 · nav.iowen.cn 风 × 博客融合 =====
   亮色默认 + data-theme=dark 暗色；article 页沿用各自样式 */

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

:root{
  --bg: #f3f5f8;
  --bg-soft: #eceff3;
  --card: #ffffff;
  --card-hover: #ffffff;
  --border: #e6e9ef;
  --text: #1f2430;
  --text-mute: #7a8291;
  --accent: #2c98b5;
  --accent-2: #5c7cfa;
  --accent-soft: #e6f4f7;
  --shadow: 0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.06);
  --shadow-lg: 0 12px 40px rgba(15,23,42,.14);
  --hero-a: #1f8fb0;
  --hero-b: #5c6bfa;
  --hero-text: #ffffff;
  --topbar: rgba(255,255,255,.86);
}
html[data-theme="dark"]{
  --bg: #14141c;
  --bg-soft: #191922;
  --card: #1f1f2a;
  --card-hover: #262633;
  --border: #2c2c3a;
  --text: #e6e6ee;
  --text-mute: #9aa0b0;
  --accent: #3cb4d4;
  --accent-2: #7b8cff;
  --accent-soft: #1d3a44;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.5);
  --hero-a: #14556a;
  --hero-b: #3d4299;
  --topbar: rgba(20,20,28,.86);
}

html { scroll-behavior: smooth; }
body{
  background: var(--bg);
  color: var(--text);
  font-family: "Source Sans Pro","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  transition: background .25s ease, color .25s ease;
  min-height: 100vh;
}
a{ color: inherit; text-decoration: none; }
.t-wrap{ max-width: 1780px; margin: 0 auto; padding: 0 20px; }

/* ===== 顶栏 ===== */
.topbar{
  position: sticky; top: 0; z-index: 50;
  background: var(--topbar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar .t-wrap{ display: flex; align-items: center; gap: 22px; height: 58px; }
.brand{ display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark{
  width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--hero-a), var(--hero-b));
  color: #fff; font-weight: 700; font-size: 17px;
  box-shadow: 0 4px 12px rgba(44,152,181,.35);
}
.brand-name{ font-weight: 700; font-size: 17px; letter-spacing: .5px; }
.top-nav{ display: flex; gap: 4px; flex: 1; }
.top-nav a{
  padding: 7px 14px; border-radius: 10px;
  font-size: 14px; color: var(--text-mute); font-weight: 500;
  transition: all .18s ease;
}
.top-nav a:hover{ color: var(--accent); background: var(--accent-soft); }
.t-actions{ display: flex; align-items: center; gap: 8px; }
.icon-btn{
  width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--card); cursor: pointer; font-size: 16px;
  display: grid; place-items: center; transition: all .18s ease; color: var(--text);
}
.icon-btn:hover{ border-color: var(--accent); transform: translateY(-1px); }

/* ===== Hero 横幅：问候 + 大搜索 ===== */
.hero{
  background:
    radial-gradient(1200px 400px at 15% -20%, rgba(255,255,255,.22), transparent 60%),
    radial-gradient(900px 360px at 90% 120%, rgba(255,255,255,.14), transparent 55%),
    linear-gradient(120deg, var(--hero-a), var(--hero-b));
  color: var(--hero-text);
  padding: 44px 0 40px;
}
.hero-inner{ max-width: 780px; margin: 0 auto; padding: 0 20px; text-align: center; }
.hero-hello h1{ font-size: 30px; font-weight: 800; letter-spacing: 1px; }
.hero-date{ margin-top: 6px; font-size: 14px; opacity: .85; font-variant-numeric: tabular-nums; }
.search-hero{
  position: relative;
  margin: 26px auto 0;
  display: flex; align-items: center;
  background: rgba(255,255,255,.96);
  border-radius: 16px;
  padding: 0 16px;
  height: 56px;
  box-shadow: 0 12px 34px rgba(10,20,40,.28);
  color: #333;
}
html[data-theme="dark"] .search-hero{ background: rgba(38,38,51,.96); color: #e6e6ee; }
.search-hero svg{ width: 22px; height: 22px; fill: currentColor; opacity: .5; flex-shrink: 0; }
.search-hero input{
  flex: 1; border: none; outline: none; background: transparent;
  font-size: 16px; padding: 0 12px; color: inherit;
}
.search-hero input::placeholder{ color: currentColor; opacity: .45; }
.search-kbd{
  flex-shrink: 0;
  border: 1px solid currentColor; border-radius: 6px; opacity: .4;
  font-size: 12px; padding: 1px 8px; font-family: inherit;
}
.clear-btn{
  flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%;
  border: none; background: rgba(0,0,0,.08); color: inherit;
  font-size: 16px; cursor: pointer; line-height: 1;
}
html[data-theme="dark"] .clear-btn{ background: rgba(255,255,255,.12); }
.hero-chips{ margin-top: 20px; display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.chip{
  background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 999px;
  padding: 6px 16px; font-size: 13px; backdrop-filter: blur(4px);
}
.chip b{ font-weight: 800; font-variant-numeric: tabular-nums; }

/* ===== 分类横条 ===== */
.cat-strip{
  position: sticky; top: 58px; z-index: 40;
  background: var(--topbar);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.cat-strip .t-wrap{ display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; padding-top: 8px; padding-bottom: 8px; }
.cat-strip .t-wrap::-webkit-scrollbar{ display: none; }
.cat-link{
  flex-shrink: 0;
  padding: 6px 14px; border-radius: 999px;
  font-size: 13px; color: var(--text-mute);
  border: 1px solid transparent;
  transition: all .18s ease; cursor: pointer;
}
.cat-link .count{ opacity: .55; font-size: 12px; margin-left: 3px; }
.cat-link:hover{ color: var(--accent); border-color: var(--accent-soft); background: var(--accent-soft); }
.cat-link.active{ color: var(--accent); border-color: var(--accent); background: var(--accent-soft); font-weight: 600; }

/* ===== 三栏布局 ===== */
.layout{
  max-width: 1780px; margin: 0 auto; padding: 24px 20px 60px;
  display: grid;
  grid-template-columns: 220px minmax(0,1fr) 290px;
  gap: 22px;
  align-items: start;
}
.sidebar{ position: sticky; top: 116px; display: flex; flex-direction: column; gap: 16px; max-height: calc(100vh - 140px); overflow-y: auto; scrollbar-width: thin; }
.side-card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: var(--shadow);
}
.side-title{ font-size: 14px; font-weight: 700; margin-bottom: 12px; letter-spacing: .3px; }
.side-list{ list-style: none; display: flex; flex-direction: column; gap: 2px; }
.side-list a{
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 10px; border-radius: 9px;
  font-size: 13.5px; color: var(--text-mute);
  transition: all .16s ease;
}
.side-list a:hover{ color: var(--accent); background: var(--accent-soft); }
.side-list a.active{ color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.side-list .num{ font-size: 12px; opacity: .6; font-variant-numeric: tabular-nums; }
.more-placeholder{ color: var(--muted, #9aa3af); font-size: 12.5px; text-align: center; padding: 6px 0; opacity: .75; }

/* ===== 统计卡 ===== */
.stat-card{ padding: 0; overflow: hidden; }
.stat-banner{
  background: linear-gradient(120deg, var(--hero-a), var(--hero-b));
  color: #fff; padding: 20px 18px;
}
.stat-brand strong{ display: block; font-size: 16px; letter-spacing: .5px; }
.stat-brand span{ display: block; margin-top: 4px; font-size: 12px; opacity: .85; }
.stat-big{ list-style: none; padding: 16px 18px 6px; }
.stat-big li{ display: flex; flex-direction: column; align-items: center; }
.stat-big span{ font-size: 34px; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; line-height: 1.1; }
.stat-big label{ font-size: 12px; color: var(--text-mute); margin-top: 2px; }
.stat-small{ list-style: none; display: grid; grid-template-columns: 1fr 1fr; padding: 4px 18px 14px; }
.stat-small li{ display: flex; flex-direction: column; align-items: center; padding: 6px 0; }
.stat-small span{ font-size: 20px; font-weight: 700; color: var(--accent-2); font-variant-numeric: tabular-nums; }
.stat-small label{ font-size: 11.5px; color: var(--text-mute); }
.updated{ padding: 10px 18px 14px; font-size: 12px; color: var(--text-mute); border-top: 1px dashed var(--border); margin: 0 0; }

/* ===== 推荐列表 ===== */
.picks{ list-style: none; display: flex; flex-direction: column; gap: 2px; }
.picks a{ display: flex; gap: 10px; align-items: flex-start; padding: 8px 8px; border-radius: 9px; transition: background .16s ease; }
.picks a:hover{ background: var(--accent-soft); }
.picks .idx{
  flex-shrink: 0; width: 22px; height: 22px; border-radius: 7px;
  display: grid; place-items: center;
  background: var(--bg-soft); color: var(--text-mute);
  font-size: 12px; font-weight: 700;
}
.picks li:nth-child(-n+3) .idx{ background: var(--accent-soft); color: var(--accent); }
.picks .meta{ min-width: 0; }
.picks .t{
  display: block; font-size: 13px; font-weight: 600;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.picks .cat{ font-size: 11.5px; color: var(--text-mute); margin-top: 2px; }

/* ===== 分类区块 ===== */
.sections{ display: flex; flex-direction: column; gap: 30px; min-height: 200px; }
.section{ scroll-margin-top: 130px; }
.section-head{ display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.section-ic{
  width: 38px; height: 38px; border-radius: 11px;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--c) 14%, transparent);
  color: var(--c);
  font-size: 17px; font-weight: 800;
  border: 1px solid color-mix(in srgb, var(--c) 25%, transparent);
}
.section-title{ font-size: 18px; font-weight: 800; letter-spacing: .3px; }
.section-count{ font-size: 12.5px; color: var(--text-mute); background: var(--bg-soft); padding: 3px 10px; border-radius: 999px; }
.section-line{ flex: 1; height: 1px; background: var(--border); }
.section-more{
  flex-shrink: 0;
  font-size: 13px; font-weight: 700; color: var(--accent);
  padding: 4px 12px; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--c) 35%, transparent);
  background: color-mix(in srgb, var(--c) 8%, transparent);
  transition: all .16s ease;
}
.section-more:hover{ background: var(--c); color: #fff; transform: translateY(-1px); }

/* 区块网格：桌面固定两列（用户偏好，参考 iowen 的 more 结构）；
   无搜索时只显示前 6 篇（2×3），搜索或 more 页才展示全部 */
.grid{ display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 14px; }
.grid.hide-extra .card:nth-child(n+7){ display: none; }
.card{
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 13px;
  padding: 14px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  position: relative;
}
.card::before{
  content: ""; position: absolute; left: 0; top: 14px; bottom: 14px;
  width: 3px; border-radius: 3px;
  background: var(--c); opacity: 0; transition: opacity .18s ease;
}
.card:hover{
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--c) 40%, var(--border));
}
.card:hover::before{ opacity: 1; }
.avatar{
  flex-shrink: 0; width: 42px; height: 42px; border-radius: 11px;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--c) 13%, transparent);
  color: var(--c);
  font-size: 18px; font-weight: 800;
}
.card-body{ min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.card-title{
  font-size: 14px; font-weight: 700; line-height: 1.35;
  display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
}
.card:hover .card-title{ color: var(--accent); }
.card-desc{
  font-size: 12.5px; color: var(--text-mute); line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-meta{ display: flex; gap: 8px; font-size: 11.5px; color: var(--text-mute); opacity: .8; }

/* ===== 空态/加载 ===== */
.empty-tip{ text-align: center; color: var(--text-mute); padding: 60px 0; font-size: 14px; }

/* ===== 页脚 ===== */
.site-footer{ border-top: 1px solid var(--border); background: var(--card); }
.site-footer .t-wrap{
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  padding-top: 18px; padding-bottom: 18px;
  font-size: 13px; color: var(--text-mute);
}
.site-footer a:hover{ color: var(--accent); }

/* ===== 响应式 ===== */
@media (max-width: 1180px){
  .layout{ grid-template-columns: 200px minmax(0,1fr); }
  .sidebar.right{ display: none; }
}
@media (max-width: 820px){
  .layout{ grid-template-columns: minmax(0,1fr); padding: 18px 14px 40px; }
  .sidebar.left{ display: none; }
  .top-nav{ display: none; }
  .hero{ padding: 30px 0 28px; }
  .hero-hello h1{ font-size: 24px; }
  .hero-inner{ padding: 0 16px; }
  .search-hero{ height: 50px; border-radius: 13px; }
  .search-kbd{ display: none; }
  .hero-chips{ gap: 8px; }
  .chip{ padding: 5px 12px; font-size: 12px; }
  .t-wrap{ padding: 0 14px; }
  .cat-strip .t-wrap{ padding: 0 14px; -webkit-overflow-scrolling: touch; }
}
@media (max-width: 640px){
  .grid{ grid-template-columns: minmax(0,1fr); gap: 11px; }
  .grid.hide-extra .card:nth-child(n+7){ display: none; }
  .section{ scroll-margin-top: 118px; }
  .section-head{ gap: 9px; margin-bottom: 11px; }
  .section-ic{ width: 32px; height: 32px; font-size: 15px; border-radius: 9px; }
  .section-title{ font-size: 16px; }
  .section-count{ font-size: 11.5px; padding: 2px 8px; }
  .section-more{ font-size: 12px; padding: 3px 10px; }
  .card{ padding: 12px; border-radius: 11px; }
  .avatar{ width: 38px; height: 38px; font-size: 16px; border-radius: 9px; }
  .card-title{ font-size: 13.5px; }
  .card-desc{ font-size: 12px; }
  .topbar .t-wrap{ height: 52px; gap: 12px; }
  .brand-mark{ width: 30px; height: 30px; font-size: 15px; border-radius: 8px; }
  .brand-name{ font-size: 15px; }
  .cat-strip{ top: 52px; }
  .cat-link{ padding: 5px 11px; font-size: 12.5px; }
  .hero-hello h1{ font-size: 21px; }
  .hero-date{ font-size: 12.5px; }
  .site-footer .t-wrap{ flex-direction: column; align-items: center; text-align: center; gap: 4px; }
}