/* ==========================================================================
 * QuickFind 统一页脚 · 样式唯一真源
 * --------------------------------------------------------------------------
 * 真源文件：quickfind-web-v5/assets/css/footer.css
 * 结构真源：quickfind-web-v5/assets/js/footer.js
 * 同步方式：node _tools/sync_footer.js        （分发到 status / releases）
 *           node _tools/sync_footer.js --check （只校验是否漂移，CI 用）
 * ⚠ 禁止直接编辑 status/ / releases/ 下的副本，改这里 + 同步，否则必然再次漂移。
 *
 * 变量策略：本站可能没有 --bg-2 / --border 等变量（v5 有、v2 子站没有），
 * 因此统一在 .footer 上定义 --f-* 前缀变量并逐级 fallback，保证三站观感一致。
 * ========================================================================== */

/* ---------- 容器 / 表面 ---------- */
.footer {
  --f-brand: var(--brand, #2B5CFF);
  --f-brand-deep: var(--brand-deep, #1E50E8);
  --f-brand-soft: var(--brand-soft, rgba(43, 92, 255, .12));
  --f-grad: var(--brand-grad, linear-gradient(135deg, #2B5CFF 0%, #00C2FF 100%));
  --f-bg: var(--bg-2, var(--bg-soft, #F0F2F7));
  --f-card: var(--card, #FFFFFF);
  --f-line: var(--border, var(--line, #E3E8F0));
  --f-ink: var(--ink, #0F172A);
  --f-ink-2: var(--ink-2, #334155);
  --f-muted: var(--muted, #64748B);
  --f-shadow: 0 18px 44px -22px rgba(15, 23, 42, .35);

  position: relative;
  margin-top: 72px;
  padding: 54px 0 26px;
  background: var(--f-bg);
  border-top: 1px solid var(--f-line);
  color: var(--f-muted);
  font-size: 13.5px;
  line-height: 1.6;
}

/* 顶部品牌渐变细线 + 极淡光晕（纯装饰） */
.footer::before,
.footer::after {
  content: "";
  position: absolute;
  pointer-events: none;
}
.footer::before {
  left: 0; right: 0; top: 0;
  height: 3px;
  background: var(--f-grad);
  opacity: .92;
}
.footer::after {
  left: 50%; top: 0;
  width: min(720px, 100%); height: 200px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, var(--f-brand-soft) 0%, transparent 68%);
  opacity: .7;
}

/* ---------- 上区：品牌 + 五栏导航 ---------- */
.footer-top {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: 40px;
  align-items: start;
}

.footer-brand .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--f-ink);
  text-decoration: none;
}
.footer-brand .brand svg {
  width: 34px; height: 34px;
  padding: 6px;
  border-radius: 11px;
  background: var(--f-brand-soft);
  color: var(--f-brand);
}
.footer-brand p {
  margin: 14px 0 0;
  max-width: 300px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--f-muted);
}

/* 2026-10-16：四栏 → 五栏（新增「开发者」）。品牌列更窄，给导航让出空间。 */
.footer-cols {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 22px;
}
.footer-col h4 {
  margin: 0 0 12px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--f-ink-2);
}
.footer-col a {
  display: block;
  padding: 6px 0;
  font-size: 13.5px;
  color: var(--f-muted);
  text-decoration: none;
  transition: color .16s ease, transform .16s ease;
}
.footer-col a:hover { color: var(--f-brand-deep); transform: translateX(3px); }
.footer-col a:focus-visible { outline: 2px solid var(--f-brand); outline-offset: 2px; border-radius: 5px; }

/* ---------- 站点生态区（子域一览） ---------- */
.footer-eco {
  position: relative;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--f-line);
}
.footer-eco-t {
  margin: 0 0 12px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--f-ink-2);
}
.footer-eco-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-eco-list li { display: block; }
.footer-eco-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--f-line);
  background: var(--f-card);
  text-decoration: none;
  transition: border-color .16s ease, color .16s ease, transform .16s ease, box-shadow .16s ease;
}
.footer-eco-list a b {
  font-size: 13px;
  font-weight: 600;
  color: var(--f-ink);
}
.footer-eco-list a span {
  font-size: 11.5px;
  color: var(--f-muted);
  font-variant-numeric: tabular-nums;
}
.footer-eco-list a:hover {
  border-color: var(--f-brand-deep);
  transform: translateY(-1px);
  box-shadow: 0 8px 18px -12px var(--f-brand);
}
.footer-eco-list a:hover b { color: var(--f-brand-deep); }
.footer-eco-list a:focus-visible { outline: 2px solid var(--f-brand); outline-offset: 2px; }

.footer-eco-note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--f-muted);
  max-width: 760px;
}

/* ---------- 社交行（后台「社交媒体管理」驱动） ---------- */
.footer-social {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--f-line);
}
.footer-social[hidden] { display: none; }
.footer-social-h {
  margin-right: 4px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--f-ink-2);
}
.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 11px;
  color: var(--f-muted);
  background: var(--f-card);
  border: 1px solid var(--f-line);
  cursor: pointer;
  transition: color .16s ease, border-color .16s ease, transform .16s ease, box-shadow .16s ease;
}
.social-btn:hover {
  color: var(--f-brand-deep);
  border-color: var(--f-brand-deep);
  transform: translateY(-2px);
  box-shadow: 0 8px 18px -10px var(--f-brand);
}
.social-btn:focus-visible { outline: 2px solid var(--f-brand); outline-offset: 2px; }
.social-btn svg { width: 18px; height: 18px; display: block; }

/* ---------- 底部条 ---------- */
.footer-bottom {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 26px;
  padding: 18px 0 2px;
  border-top: 1px solid var(--f-line);
  font-size: 12.5px;
  color: var(--f-muted);
}
.footer-bottom a {
  color: var(--f-muted);
  text-decoration: none;
  transition: color .15s ease;
}
.footer-bottom a:hover { color: var(--f-brand-deep); }
.qf-bottom-links { display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.qf-bottom-links a { white-space: nowrap; }
.qf-dot { opacity: .45; }

/* ---------- 二维码弹窗 ---------- */
.qf-qr-mask {
  position: fixed; inset: 0;
  background: rgba(15, 23, 42, .55);
  display: flex; align-items: center; justify-content: center;
  z-index: 9999; padding: 20px;
}
.qf-qr-card {
  position: relative;
  width: 100%; max-width: 320px;
  padding: 22px;
  border-radius: 16px;
  background: var(--f-card);
  box-shadow: var(--f-shadow);
  text-align: center;
}
.qf-qr-title { margin: 0 0 14px; font-size: 16px; font-weight: 700; color: var(--f-ink); }
.qf-qr-img { width: 200px; height: 200px; max-width: 100%; border-radius: 10px; }
.qf-qr-x { position: absolute; top: 10px; right: 10px; }

/* ---------- 深色主题 ---------- */
[data-theme="dark"] .footer {
  --f-bg: var(--bg-2, #0E1725);
  --f-card: var(--card, #141D2A);
  --f-line: var(--border, #263042);
  --f-ink: var(--ink, #E6EDF6);
  --f-ink-2: #9AA6B8;
  --f-muted: #8B97A8;
  --f-brand: var(--brand, #6C8FFF);
  --f-brand-deep: var(--brand-deep, #9FB5FF);
  --f-brand-soft: rgba(108, 143, 255, .18);
}
[data-theme="dark"] .footer::before { opacity: .8; }
[data-theme="dark"] .footer::after { opacity: .55; }
[data-theme="dark"] .footer-col h4,
[data-theme="dark"] .footer-eco-t,
[data-theme="dark"] .footer-social-h { color: #9AA6B8; }
[data-theme="dark"] .social-btn:hover { box-shadow: 0 8px 18px -10px var(--f-brand); }

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  /* 五栏在窄屏会挤到每栏不足 90px，先降到三栏 */
  .footer-cols { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px 24px; }
}
@media (max-width: 960px) {
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .footer-brand p { max-width: 560px; }
}
@media (max-width: 640px) {
  .footer { padding: 40px 0 22px; margin-top: 56px; }
  .footer-cols { grid-template-columns: 1fr 1fr; gap: 18px 20px; }
  .footer-col h4 { margin-bottom: 8px; }
  .footer-col a { min-height: 44px; display: flex; align-items: center; padding: 0; }
  .footer-eco { margin-top: 26px; padding-top: 18px; }
  .footer-eco-list a { padding: 9px 13px; min-height: 40px; }
  .footer-social { gap: 10px; }
  .social-btn { width: 40px; height: 40px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 8px; }
}
@media (max-width: 420px) {
  .footer-cols { grid-template-columns: 1fr; }
  /* 极窄屏下生态区改为整宽堆叠，避免 host 域名被压到换行 */
  .footer-eco-list a { width: 100%; justify-content: space-between; }
}
@media print {
  .footer-social, .footer::after { display: none !important; }
}