/* 17258 AI 工具库 —— 响应式样式
   设计目标：移动优先、单一 CSS 文件、零外部依赖、明暗双主题自动适配 */

:root {
  --bg: #f6f7fb;
  --bg-elev: #ffffff;
  --bg-soft: #eef0f7;
  --text: #16192b;
  --text-soft: #5a6079;
  --text-mute: #868da3;
  --border: #e3e6f0;
  --brand: #5b5bd6;
  --brand-deep: #4343b0;
  --brand-soft: #ececfd;
  --accent: #8b5cf6;
  --ok: #16a34a;
  --warn: #d97706;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(20, 22, 40, .04), 0 8px 24px rgba(20, 22, 40, .06);
  --shadow-lg: 0 2px 6px rgba(20, 22, 40, .06), 0 18px 44px rgba(20, 22, 40, .10);
  --maxw: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1120;
    --bg-elev: #171a2b;
    --bg-soft: #1e2237;
    --text: #eceefb;
    --text-soft: #aab1cc;
    --text-mute: #7d86a8;
    --border: #2a2f47;
    --brand: #8b8bf0;
    --brand-deep: #a5a5ff;
    --brand-soft: #22254a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
    --shadow-lg: 0 2px 6px rgba(0, 0, 0, .35), 0 18px 44px rgba(0, 0, 0, .45);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
  border-radius: 6px;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--brand); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

.muted { color: var(--text-soft); }
.small { font-size: 13px; }

/* ---------------------------------------------------------------- 头部 */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg-elev) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 16px; min-height: 64px; }

.brand { display: flex; align-items: center; gap: 10px; color: var(--text); flex-shrink: 0; }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center;
  width: 38px; height: 38px; border-radius: 11px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff; font-weight: 800; font-size: 14px; letter-spacing: .5px;
  box-shadow: 0 4px 12px color-mix(in srgb, var(--brand) 40%, transparent);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 16px; letter-spacing: .2px; }
.brand-text em { font-style: normal; font-size: 12px; color: var(--text-mute); }

.site-nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.site-nav a {
  padding: 8px 12px; border-radius: 9px; font-size: 15px; color: var(--text-soft);
  transition: background .18s, color .18s;
}
.site-nav a:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.site-nav a.active { background: var(--brand-soft); color: var(--brand-deep); font-weight: 600; }

.nav-toggle {
  display: none; margin-left: auto;
  width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--bg-elev); cursor: pointer; padding: 11px 10px;
}
.nav-toggle span { display: block; height: 2px; background: var(--text); border-radius: 2px; }
.nav-toggle span + span { margin-top: 5px; }

/* ---------------------------------------------------------------- Hero */
.hero {
  background:
    radial-gradient(900px 380px at 12% -10%, color-mix(in srgb, var(--brand) 22%, transparent), transparent 60%),
    radial-gradient(700px 320px at 88% 0%, color-mix(in srgb, var(--accent) 20%, transparent), transparent 60%),
    var(--bg-elev);
  border-bottom: 1px solid var(--border);
  padding: 56px 0 44px;
  text-align: center;
}
.hero h1 { margin: 0 0 12px; font-size: clamp(28px, 5.2vw, 46px); line-height: 1.2; letter-spacing: -.5px; }
.hero h1 .grad {
  background: linear-gradient(120deg, var(--brand), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { margin: 0 auto 26px; max-width: 640px; color: var(--text-soft); font-size: clamp(15px, 2.2vw, 18px); }

.searchbar { max-width: 620px; margin: 0 auto; display: flex; gap: 8px; }
.searchbar input {
  flex: 1; min-width: 0; padding: 13px 16px; font-size: 16px;
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--bg-elev); color: var(--text); font-family: inherit;
}
.searchbar input:focus { outline: 3px solid color-mix(in srgb, var(--brand) 45%, transparent); outline-offset: 1px; }
.searchbar button {
  padding: 13px 22px; border: 0; border-radius: 12px; cursor: pointer;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff; font-size: 15px; font-weight: 600; font-family: inherit;
}
.searchbar button:hover { filter: brightness(1.06); }

.stats { display: flex; justify-content: center; gap: 30px; margin-top: 28px; flex-wrap: wrap; }
.stats div { text-align: center; }
.stats b { display: block; font-size: 24px; line-height: 1.2; }
.stats span { font-size: 13px; color: var(--text-mute); }

/* ---------------------------------------------------------------- 区块 */
.section { padding: 46px 0 8px; }
.section-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.section-head h2 { margin: 0; font-size: 22px; letter-spacing: -.2px; }
.section-head p { margin: 0; color: var(--text-mute); font-size: 14px; }
.section-head .more { margin-left: auto; font-size: 14px; }

/* ---------------------------------------------------------------- 卡片网格 */
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(268px, 1fr)); }

.card {
  display: flex; flex-direction: column; gap: 10px;
  padding: 18px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-elev); box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--brand) 35%, var(--border)); text-decoration: none; }

.card-top { display: flex; align-items: center; gap: 11px; }
.card-logo {
  width: 40px; height: 40px; border-radius: 10px; flex-shrink: 0;
  display: grid; place-items: center; background: var(--bg-soft);
  font-weight: 700; color: var(--brand-deep); font-size: 16px; overflow: hidden;
}
/* 真实公司图标：绝对定位铺满，加载失败时 onerror 移除，露出底层字母头像 */
.card-logo { position: relative; overflow: hidden; }
.card-logo img.logo-img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: contain; background: #fff; border-radius: inherit;
  padding: 18%; box-sizing: border-box;
}
/* 本地生成的字母头像：按名称算出色相，零外部请求、无布局抖动 */
.card-logo.av {
  background: linear-gradient(135deg,
    hsl(var(--h, 240) 74% 92%),
    hsl(var(--h, 240) 74% 84%));
  color: hsl(var(--h, 240) 52% 30%);
}
.card-logo.lg { width: 56px; height: 56px; border-radius: 14px; font-size: 21px; }
.card-title { min-width: 0; }
.card-title h3 { margin: 0; font-size: 16px; line-height: 1.35; overflow-wrap: anywhere; }
.card-title .dom { font-size: 12px; color: var(--text-mute); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.card-desc { margin: 0; font-size: 14px; color: var(--text-soft); line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: auto; padding-top: 4px; }

.tag {
  display: inline-block; padding: 2px 9px; border-radius: 999px;
  background: var(--brand-soft); color: var(--brand-deep);
  font-size: 12px; line-height: 1.7; white-space: nowrap;
}
.tag.ghost { background: var(--bg-soft); color: var(--text-soft); }

/* ---------------------------------------------------------------- 列表行 */
.rows { display: grid; gap: 10px; }
.row {
  display: flex; align-items: center; gap: 12px;
  padding: 13px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-elev);
}
.row:hover { border-color: color-mix(in srgb, var(--brand) 35%, var(--border)); text-decoration: none; }
.row .row-main { min-width: 0; flex: 1; }
.row .row-main strong { font-size: 15px; display: block; overflow-wrap: anywhere; }
.row .row-main span { font-size: 13px; color: var(--text-mute); display: block;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row .row-go { font-size: 13px; color: var(--text-mute); white-space: nowrap; }

/* ---------------------------------------------------------------- 分类条 */
.chips { display: flex; flex-wrap: wrap; gap: 9px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 15px; border: 1px solid var(--border); border-radius: 999px;
  background: var(--bg-elev); color: var(--text-soft); font-size: 14px;
}
.chip:hover { border-color: var(--brand); color: var(--brand-deep); text-decoration: none; }
.chip b { color: var(--text-mute); font-weight: 500; font-size: 12px; }

/* ---------------------------------------------------------------- 详情页 */
.article { padding: 34px 0 20px; }
.crumb { font-size: 13px; color: var(--text-mute); margin-bottom: 14px; }
.crumb a { color: var(--text-soft); }

.panel {
  padding: 26px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-elev); box-shadow: var(--shadow);
}
.panel-head { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.panel-head .card-logo { width: 56px; height: 56px; border-radius: 14px; font-size: 20px; }
.panel-head h1 { margin: 0 0 4px; font-size: clamp(21px, 3.4vw, 28px); line-height: 1.25; }
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 11px; font-size: 15px; font-weight: 600;
  background: linear-gradient(135deg, var(--brand), var(--accent)); color: #fff;
}
.btn:hover { text-decoration: none; filter: brightness(1.06); }
.btn.ghost { background: var(--bg-soft); color: var(--text); border: 1px solid var(--border); }

.kv { display: grid; grid-template-columns: 96px 1fr; gap: 8px 14px; margin: 20px 0 0; font-size: 14px; }
.kv dt { color: var(--text-mute); }
.kv dd { margin: 0; overflow-wrap: anywhere; }

.prose { font-size: 16px; line-height: 1.85; }
.prose h1, .prose h2, .prose h3 { line-height: 1.35; margin: 1.5em 0 .6em; }
.prose h2 { font-size: 21px; }
.prose h3 { font-size: 18px; }
.prose p { margin: 0 0 1em; }
.prose ul { padding-left: 22px; margin: 0 0 1em; }
.prose li { margin: .3em 0; }
.prose code { background: var(--bg-soft); padding: 2px 6px; border-radius: 5px; font-size: 14px; }
.prose pre { background: var(--bg-soft); padding: 14px 16px; border-radius: 10px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; }
.prose blockquote {
  margin: 1em 0; padding: 10px 16px; border-left: 3px solid var(--brand);
  background: var(--bg-soft); border-radius: 0 8px 8px 0; color: var(--text-soft);
}
.prose img { border-radius: 10px; }

.notice {
  margin: 18px 0 0; padding: 12px 16px; border-radius: 10px;
  background: var(--bg-soft); color: var(--text-soft); font-size: 13px;
  border-left: 3px solid var(--warn);
}

/* ---------------------------------------------------------------- 商业化组件 */
.ad-box {
  min-height: 0; padding: 14px; border: 1px dashed var(--border);
  border-radius: var(--radius); background: var(--bg-elev); overflow: hidden;
}
.ad-box:empty { display: none; }
.ad-box::before {
  content: "广告"; display: block; margin-bottom: 8px;
  font-size: 11px; letter-spacing: 1px; color: var(--text-mute);
}

.tag.sponsor { background: #fff2d9; color: #8a5200; font-weight: 600; }
@media (prefers-color-scheme: dark) {
  .tag.sponsor { background: #4a3410; color: #ffd790; }
}

.sponsor-note { border-left-color: var(--warn); }

.rank-no {
  width: 26px; height: 26px; flex-shrink: 0; border-radius: 8px;
  display: grid; place-items: center; font-size: 13px; font-weight: 700;
  background: var(--bg-soft); color: var(--text-soft);
}
.row:nth-child(-n+3) .rank-no {
  background: linear-gradient(135deg, var(--brand), var(--accent)); color: #fff;
}

.sub-box {
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px; flex-wrap: wrap;
}

.plan-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin: 18px 0; }
.plan { border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; background: var(--bg-soft); }
.plan h3 { margin: 0 0 6px; font-size: 17px; }
.plan .price { margin: 0 0 12px; font-size: 20px; font-weight: 700; color: var(--brand-deep); }
.plan ul { margin: 0; padding-left: 20px; font-size: 14px; }

/* ---------------------------------------------------------------- 搜索页 */
.search-results { display: grid; gap: 10px; }
.empty { padding: 40px 0; text-align: center; color: var(--text-mute); }

/* ---------------------------------------------------------------- 页脚 */
.site-footer { margin-top: 60px; padding: 40px 0 28px; border-top: 1px solid var(--border); background: var(--bg-elev); }
.footer-grid { display: grid; gap: 26px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.footer-col h3 { margin: 0 0 8px; font-size: 16px; }
.footer-col h4 { margin: 0 0 10px; font-size: 14px; color: var(--text-mute); font-weight: 600; }
.footer-col p { margin: 0 0 6px; }
.link-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: 14px; }
.footer-bottom { margin-top: 26px; padding-top: 16px; border-top: 1px solid var(--border); }
.footer-bottom p { margin: 4px 0; }

.to-top {
  position: fixed; right: 18px; bottom: 18px; z-index: 30;
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--text); cursor: pointer;
  box-shadow: var(--shadow); display: none; font-size: 18px;
}
.to-top.show { display: block; }

/* ---------------------------------------------------------------- 响应式 */
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none; width: 100%; margin: 0 0 12px; padding: 10px 0 0;
    border-top: 1px solid var(--border); flex-direction: column; gap: 2px;
  }
  .site-nav.open { display: flex; }
  .header-inner { flex-wrap: wrap; padding-top: 10px; padding-bottom: 0; }
  .hero { padding: 40px 0 34px; }
  .stats { gap: 20px; }
}

@media (max-width: 560px) {
  body { font-size: 15.5px; }
  .wrap { padding: 0 14px; }
  .grid { grid-template-columns: 1fr; }
  .searchbar { flex-direction: column; }
  .searchbar button { width: 100%; }
  .panel { padding: 18px; }
  .kv { grid-template-columns: 76px 1fr; }
  .row { align-items: flex-start; }
  .row .row-go { display: none; }
  .brand-text em { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

@media print {
  .site-header, .site-footer, .to-top, .searchbar { display: none !important; }
  .card, .panel { box-shadow: none; break-inside: avoid; }
}

/* ---------------------------------------------------------------- 视频入口 */
.tag.link {
  background: color-mix(in srgb, var(--brand) 14%, var(--bg-soft));
  color: var(--brand-deep);
  cursor: pointer; font-weight: 600;
}
.tag.link:hover { filter: brightness(1.05); text-decoration: none; }
.videobox { margin-top: 8px; }
.vlinks { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px; }
.vbtn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border-radius: 999px;
  background: var(--brand); color: #fff; font-size: 14px; font-weight: 600;
  text-decoration: none; border: 1px solid transparent;
}
.vbtn:hover { text-decoration: none; filter: brightness(1.07); }
.vbtn:nth-child(2) { background: var(--bg-elev); color: var(--text); border-color: var(--border); }
.vbtn:nth-child(3) { background: var(--bg-elev); color: var(--text); border-color: var(--border); }