/* ai-bot.win — 无框架、无外部依赖 */

:root {
  --bg:        #fcfcfb;
  --surface:   #ffffff;
  --surface-2: #f4f4f2;
  --text:      #16181b;
  --muted:     #6b7078;
  --faint:     #9aa0a8;
  --border:    #e4e5e7;
  --border-2:  #d3d5d8;
  --accent:    #d94a1a;
  --accent-bg: #fdeee8;
  --shadow:    0 1px 2px rgba(16,18,21,.05), 0 6px 20px -12px rgba(16,18,21,.22);
  --radius:    12px;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
          "Liberation Mono", monospace;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:        #0c0d0f;
    --surface:   #15171a;
    --surface-2: #1c1f23;
    --text:      #e9eaec;
    --muted:     #949aa2;
    --faint:     #6d737b;
    --border:    #24272c;
    --border-2:  #343940;
    --accent:    #ff6a3d;
    --accent-bg: #2a1610;
    --shadow:    0 1px 2px rgba(0,0,0,.4), 0 8px 24px -14px rgba(0,0,0,.8);
  }
}

:root[data-theme="dark"] {
  --bg:        #0c0d0f;
  --surface:   #15171a;
  --surface-2: #1c1f23;
  --text:      #e9eaec;
  --muted:     #949aa2;
  --faint:     #6d737b;
  --border:    #24272c;
  --border-2:  #343940;
  --accent:    #ff6a3d;
  --accent-bg: #2a1610;
  --shadow:    0 1px 2px rgba(0,0,0,.4), 0 8px 24px -14px rgba(0,0,0,.8);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

svg { width: 100%; height: 100%; fill: none; stroke: currentColor;
      stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }

kbd {
  font: 500 11px/1 var(--mono);
  padding: 3px 5px;
  border: 1px solid var(--border-2);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--muted);
  vertical-align: 1px;
}

.skip {
  position: absolute; left: -9999px;
  background: var(--accent); color: #fff;
  padding: 10px 16px; border-radius: 8px; z-index: 100;
}
.skip:focus { left: 12px; top: 12px; }

:where(a, button, input):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ── 顶栏 ───────────────────────────────────────── */

.topbar {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(12px);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 1180px; margin: 0 auto;
  padding: 11px 20px;
  display: flex; align-items: center; gap: 14px;
}

.brand {
  display: flex; align-items: center; gap: 9px;
  text-decoration: none; color: var(--text);
  font: 600 16px/1 var(--mono);
  letter-spacing: -.02em;
  flex-shrink: 0;
}
.brand-mark {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}
.brand-tld { color: var(--accent); }
@media (max-width: 560px) { .brand-text { display: none; } }

.search {
  flex: 1; min-width: 0;
  position: relative;
  display: flex; align-items: center;
}
.search-icon {
  position: absolute; left: 11px;
  width: 16px; height: 16px;
  color: var(--faint); pointer-events: none;
}
#q {
  width: 100%;
  padding: 9px 40px 9px 35px;
  font: 14px/1.4 var(--sans);
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid transparent;
  border-radius: 9px;
  transition: border-color .15s, background .15s;
}
#q::placeholder { color: var(--faint); }
#q:focus {
  outline: none;
  background: var(--surface);
  border-color: var(--accent);
}
#q::-webkit-search-cancel-button { -webkit-appearance: none; }
.search-kbd { position: absolute; right: 9px; pointer-events: none; }
#q:focus ~ .search-kbd { opacity: 0; }

.icon-btn {
  flex-shrink: 0;
  width: 34px; height: 34px; padding: 8px;
  color: var(--muted);
  background: none; border: 1px solid var(--border);
  border-radius: 9px; cursor: pointer;
  transition: color .15s, border-color .15s;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-2); }
.i-moon { display: none; }
:root[data-theme="dark"] .i-sun { display: none; }
:root[data-theme="dark"] .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .i-sun { display: none; }
  :root:not([data-theme="light"]) .i-moon { display: block; }
}

/* ── Hero ───────────────────────────────────────── */

main { max-width: 1180px; margin: 0 auto; padding: 0 20px 64px; }

.hero { padding: 56px 0 34px; max-width: 660px; }
.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(27px, 4.6vw, 40px);
  line-height: 1.18;
  letter-spacing: -.025em;
  font-weight: 640;
}
.hl { color: var(--accent); }
.sub { margin: 0; color: var(--muted); font-size: 15px; }
.nowrap { white-space: nowrap; }
#stat-count { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; }

/* ── 分类栏 ─────────────────────────────────────── */

.cats {
  position: sticky; top: 57px; z-index: 20;
  display: flex; gap: 7px;
  padding: 10px 0;
  margin-bottom: 10px;
  overflow-x: auto;
  scrollbar-width: none;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  -webkit-overflow-scrolling: touch;
}
.cats::-webkit-scrollbar { display: none; }

.cat {
  flex-shrink: 0;
  padding: 6px 13px;
  font: 500 13px/1.5 var(--sans);
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition: color .13s, background .13s, border-color .13s;
}
.cat:hover { color: var(--text); }
.cat[aria-pressed="true"] {
  color: var(--accent);
  background: var(--accent-bg);
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
}
.cat .n {
  font: 500 11px/1 var(--mono);
  color: var(--faint);
  margin-left: 5px;
}
.cat[aria-pressed="true"] .n { color: inherit; opacity: .7; }

/* ── 分组 + 卡片 ────────────────────────────────── */

.group { padding-top: 26px; }
.group-head {
  display: flex; align-items: baseline; gap: 9px;
  margin: 0 0 14px;
}
.group-head h2 {
  margin: 0;
  font-size: 15px; font-weight: 620;
  letter-spacing: -.01em;
}
.group-head .n {
  font: 500 12px/1 var(--mono);
  color: var(--faint);
}
.group-head .desc {
  margin-left: auto;
  font-size: 12.5px; color: var(--faint);
}
@media (max-width: 620px) { .group-head .desc { display: none; } }

.grid {
  display: grid;
  gap: 9px;
  grid-template-columns: repeat(auto-fill, minmax(255px, 1fr));
}

.card {
  display: block;
  padding: 13px 15px 12px;
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color .14s, box-shadow .14s, transform .14s;
}
.card:hover {
  border-color: var(--border-2);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.card:hover .card-name { color: var(--accent); }

.card-top { display: flex; align-items: center; gap: 8px; margin-bottom: 5px; }
.card-name {
  font-size: 14.5px; font-weight: 600; letter-spacing: -.01em;
  transition: color .14s;
}
.card-badge {
  flex-shrink: 0;
  font: 500 10px/1 var(--mono);
  padding: 3.5px 6px;
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--faint);
  letter-spacing: .02em;
}
.card-badge.cn { color: var(--accent); background: var(--accent-bg); }
.card-arrow {
  margin-left: auto; width: 13px; height: 13px;
  color: var(--faint); opacity: 0;
  transition: opacity .14s, transform .14s;
}
.card:hover .card-arrow { opacity: 1; transform: translate(1px, -1px); }

.card-desc {
  font-size: 13px; line-height: 1.5; color: var(--muted);
  margin-bottom: 8px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-host { font: 11.5px/1 var(--mono); color: var(--faint); }

mark {
  background: color-mix(in srgb, var(--accent) 22%, transparent);
  color: inherit;
  border-radius: 3px;
  padding: 0 1px;
}

/* ── 空状态 / 页脚 ──────────────────────────────── */

.empty { padding: 60px 0; text-align: center; color: var(--muted); }
.linkish {
  background: none; border: none; padding: 0;
  color: var(--accent); font: inherit; cursor: pointer;
  text-decoration: underline; text-underline-offset: 3px;
}

.foot {
  max-width: 1180px; margin: 0 auto;
  padding: 26px 20px 40px;
  border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: 8px;
  font-size: 12.5px; color: var(--faint);
}
.foot .dot { opacity: .5; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .card:hover { transform: none; }
}

/* 切主题的瞬间关掉所有过渡：否则带 transition 的元素在渐变、其他元素直接跳变，
   中间约 150ms 页面是花的。app.js 切完下一帧移除这个 class。 */
:root.theme-switching, :root.theme-switching * {
  transition: none !important;
}