/* FDE Hub — 站点样式
   设计约束：轻量、移动端优先、广告位预留、无外部字体请求（避免拖慢 LCP）。 */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-alt: #fbfcfd;
  --ink: #14161a;
  --ink-soft: #4a5160;
  --ink-mute: #767e8c;
  --line: #e4e7ec;
  --accent: #1f5fd8;
  --accent-soft: #eaf1ff;
  --warn: #b45309;
  --star: #d98a00;
  --radius: 12px;
  --radius-lg: 18px;
  --wrap: 1180px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 8px 24px -12px rgba(16, 24, 40, .12);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

* { 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: 1.65;
  color: var(--ink);
  background: var(--bg);
}

img { max-width: 100%; height: auto; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.wrap.narrow { max-width: 780px; }

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

/* ---------------- Header ---------------- */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex; align-items: center; gap: 18px;
  min-height: 62px;
}

.brand { display: flex; align-items: center; gap: 9px; color: var(--ink); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-grid; place-items: center;
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--ink); color: #fff;
  font-size: 11px; font-weight: 800; letter-spacing: .5px;
}
.brand-name { font-size: 16px; letter-spacing: -.2px; }

.primary-nav { display: flex; gap: 4px; margin-left: 8px; flex: 1; }
.primary-nav a {
  padding: 7px 11px; border-radius: 8px;
  color: var(--ink-soft); font-size: 14.5px; font-weight: 500;
}
.primary-nav a:hover { background: var(--bg-soft); text-decoration: none; color: var(--ink); }
.primary-nav a.active { background: var(--accent-soft); color: var(--accent); }

.header-tools { display: flex; align-items: center; gap: 12px; }

.search input {
  width: 170px; padding: 7px 12px;
  border: 1px solid var(--line); border-radius: 999px;
  background: var(--bg-soft); font-size: 14px; font-family: inherit; color: var(--ink);
}
.search input:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); background: #fff; }

.lang-switch { display: flex; gap: 2px; border: 1px solid var(--line); border-radius: 999px; padding: 3px; }
.lang-switch a {
  padding: 3px 9px; border-radius: 999px; font-size: 12.5px; color: var(--ink-mute);
}
.lang-switch a.active { background: var(--ink); color: #fff; }
.lang-switch a:hover { text-decoration: none; }

.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 8px; cursor: pointer; }
.nav-toggle span { display: block; width: 16px; height: 2px; background: var(--ink); margin: 3px 0; }

/* ---------------- Hero ---------------- */

.hero {
  padding: 56px 0 34px;
  background: linear-gradient(180deg, var(--bg-soft), var(--bg));
  border-bottom: 1px solid var(--line);
}
.hero h1 {
  margin: 0 0 12px; font-size: clamp(28px, 4.6vw, 44px); line-height: 1.15;
  letter-spacing: -1px; max-width: 20ch;
}
.hero-intro { margin: 0 0 22px; font-size: 17px; color: var(--ink-soft); max-width: 62ch; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 22px; margin-bottom: 22px; font-size: 14px; color: var(--ink-mute); }
.hero-stats strong { font-size: 20px; color: var(--ink); margin-right: 5px; letter-spacing: -.5px; }

.category-chips, .filter-bar { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-block; padding: 5px 12px; border-radius: 999px;
  background: #fff; border: 1px solid var(--line);
  font-size: 13px; color: var(--ink-soft);
}
.chip:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* ---------------- Sections ---------------- */

.section { padding: 44px 0; }
.section.alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 20px; gap: 16px; }
.section-head h2 { margin: 0; font-size: 21px; letter-spacing: -.3px; }
.section-more { font-size: 14px; color: var(--accent); }

.page-title { margin: 14px 0 8px; font-size: clamp(24px, 3.4vw, 34px); letter-spacing: -.6px; }
.page-intro { margin: 0 0 26px; color: var(--ink-soft); max-width: 70ch; }

.breadcrumb { padding: 16px 0 0; font-size: 13px; color: var(--ink-mute); }
.breadcrumb .sep { margin: 0 8px; opacity: .5; }

/* ---------------- Cards ---------------- */

.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(258px, 1fr)); gap: 16px; }
.card-grid.wide { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }

.card {
  display: flex; flex-direction: column; gap: 8px;
  padding: 18px; background: #fff;
  border: 1px solid var(--line); border-radius: var(--radius);
  transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}
.card:hover { border-color: #cfd6e4; box-shadow: var(--shadow); transform: translateY(-1px); }
.card h3 { margin: 0; font-size: 16.5px; line-height: 1.35; letter-spacing: -.2px; }
.card h3 a { color: var(--ink); }
.card h3 a:hover { color: var(--accent); text-decoration: none; }
.card-desc { margin: 0; font-size: 14px; color: var(--ink-soft); flex: 1; }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; font-size: 12px; color: var(--ink-mute); }
.card-cat { color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: .5px; font-size: 11.5px; }
.card-foot { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding-top: 4px; }
.tag-mini { font-size: 12px; color: var(--ink-mute); }
.card-cta { font-size: 13.5px; font-weight: 600; white-space: nowrap; }
.stars { color: var(--star); font-weight: 600; white-space: nowrap; }
.price-mini { font-weight: 700; color: var(--ink); }

.empty-state { padding: 32px 0; text-align: center; color: var(--ink-mute); font-size: 14.5px; }

/* ---------------- Detail ---------------- */

.detail { padding: 8px 0 44px; max-width: 820px; }
.detail-head { margin-bottom: 26px; }
.detail-meta { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--ink-mute); margin-bottom: 10px; }
.detail h1 { margin: 0 0 12px; font-size: clamp(26px, 3.6vw, 38px); line-height: 1.2; letter-spacing: -.7px; }
.detail-oneliner { margin: 0 0 18px; font-size: 17px; color: var(--ink-soft); }
.detail-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.detail-body { margin: 24px 0; }
.detail-body .lead { font-size: 17px; color: var(--ink); }
.detail-body .kv { font-size: 15px; color: var(--ink-soft); }

.btn {
  display: inline-block; padding: 9px 18px; border-radius: 999px;
  font-size: 14.5px; font-weight: 600; border: 1px solid transparent;
}
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: #1a4fb5; text-decoration: none; }
.btn.ghost { background: #fff; border-color: var(--line); color: var(--ink); }
.btn.big { padding: 12px 26px; font-size: 16px; }

.notice {
  padding: 10px 14px; border-radius: 8px;
  background: #fff8ec; border: 1px solid #f2e0bf; color: var(--warn); font-size: 13.5px;
}

.prose h2 { margin: 30px 0 10px; font-size: 20px; letter-spacing: -.3px; }
.prose p { margin: 0 0 16px; }
.prose ul, .prose ol { margin: 0 0 18px; padding-left: 22px; }
.prose li { margin-bottom: 7px; }

.takeaways {
  margin: 26px 0; padding: 18px 20px;
  background: var(--accent-soft); border-radius: var(--radius);
}
.takeaways h2 { margin: 0 0 10px; font-size: 17px; }
.takeaways ul { margin: 0; padding-left: 20px; }

.source-note { font-size: 13.5px; color: var(--ink-mute); border-top: 1px solid var(--line); padding-top: 14px; }

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 30px; }
.tag {
  padding: 4px 11px; border-radius: 999px; background: var(--bg-soft);
  font-size: 12.5px; color: var(--ink-soft); border: 1px solid var(--line);
}
.tag:hover { background: var(--accent-soft); color: var(--accent); text-decoration: none; }

.related { margin-top: 40px; padding-top: 28px; border-top: 1px solid var(--line); }
.related h2 { font-size: 19px; margin: 0 0 16px; }
.related .card-grid { margin-bottom: 32px; }

.product-strip .card-grid { margin-top: 16px; }
.product-page .price-row { display: flex; align-items: baseline; gap: 12px; margin: 16px 0; }
.product-page .price { font-size: 30px; font-weight: 800; letter-spacing: -1px; }
.product-page .price-old { color: var(--ink-mute); text-decoration: line-through; font-size: 17px; }
.bullet-list { margin: 0 0 24px; padding-left: 20px; }
.bullet-list li { margin-bottom: 8px; }

/* ---------------- Ads ---------------- */

.ad-slot { margin: 22px 0; min-height: 90px; }

/* ---------------- Forms ---------------- */

.contact-form { display: flex; flex-direction: column; gap: 6px; max-width: 560px; margin: 8px 0 24px; }
.contact-form label { font-size: 14px; font-weight: 600; margin-top: 8px; }
.contact-form input, .contact-form textarea {
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px;
  font-family: inherit; font-size: 15px; background: #fff; color: var(--ink);
}
.contact-form input:focus, .contact-form textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.contact-form button { margin-top: 16px; align-self: flex-start; border: 0; cursor: pointer; }
.honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; }
.form-status { font-size: 14px; color: var(--ink-soft); min-height: 20px; margin: 6px 0 0; }
.contact-alt { font-size: 14px; color: var(--ink-mute); }

/* ---------------- Footer ---------------- */

.site-footer { background: var(--bg-soft); border-top: 1px solid var(--line); padding: 44px 0 28px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; }
.footer-col h3 { margin: 0 0 12px; font-size: 13px; text-transform: uppercase; letter-spacing: .8px; color: var(--ink-mute); }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.footer-col ul a { font-size: 14px; color: var(--ink-soft); }
.footer-tagline { font-size: 14px; color: var(--ink-soft); margin: 12px 0 10px; max-width: 34ch; }
.footer-contact { font-size: 14px; margin: 0; }

.disclosure {
  margin: 30px 0 18px; padding: 16px 18px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  font-size: 13px; color: var(--ink-mute);
}
.disclosure strong { color: var(--ink-soft); }
.disclosure p { margin: 6px 0 0; }
.affiliate-note { color: var(--ink-mute); }

.footer-bottom {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between;
  padding-top: 16px; border-top: 1px solid var(--line);
  font-size: 13px; color: var(--ink-mute);
}

/* ---------------- Responsive ---------------- */

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .header-inner { flex-wrap: wrap; min-height: 56px; padding-top: 8px; padding-bottom: 8px; }
  .nav-toggle { display: block; order: 3; }
  .primary-nav {
    order: 5; flex-basis: 100%; flex-direction: column; gap: 2px;
    max-height: 0; overflow: hidden; margin: 0; transition: max-height .2s ease;
  }
  .primary-nav.open { max-height: 320px; padding: 8px 0; }
  .primary-nav a { padding: 9px 10px; }
  .header-tools { order: 2; margin-left: auto; }
  .search input { width: 120px; }
  .lang-switch { font-size: 12px; }
  .hero { padding: 34px 0 26px; }
  .card-grid, .card-grid.wide { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}

@media print {
  .site-header, .site-footer, .ad-slot, .filter-bar { display: none; }
}

/* ---------------- 邮件订阅 ---------------- */
.subscribe-box {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 12px 32px; align-items: center;
  margin: 0 0 32px; padding: 22px 24px;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px;
}
.subscribe-box h3 { margin: 0 0 6px; font-size: 16px; font-weight: 600; }
.subscribe-copy p { margin: 0; font-size: 14px; color: var(--ink-mute); }
.subscribe-form { display: flex; gap: 8px; flex-wrap: wrap; }
.subscribe-form input[type="email"] {
  flex: 1 1 200px; min-width: 0; padding: 10px 12px; font: inherit; font-size: 14px;
  border: 1px solid var(--line); border-radius: 8px; background: #fff; color: inherit;
}
.subscribe-form button {
  padding: 10px 18px; font: inherit; font-size: 14px; font-weight: 600; cursor: pointer;
  border: 1px solid var(--ink); border-radius: 8px; background: var(--ink); color: #fff;
}
.subscribe-form button:hover { opacity: .88; }
.subscribe-note { grid-column: 1 / -1; margin: 0; font-size: 12px; color: var(--ink-mute); }
.subscribe-form .form-status { flex-basis: 100%; margin: 0; font-size: 13px; }
/* 蜜罐字段：真人看不见，机器人会填 */
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

/* ---------------- Cookie 同意横幅 ---------------- */
.consent {
  position: sticky; bottom: 0; z-index: 60;
  display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center; justify-content: space-between;
  padding: 14px 20px; background: #fff;
  border-top: 1px solid var(--line); box-shadow: 0 -2px 12px rgba(0,0,0,.06);
}
.consent[hidden] { display: none; }
.consent-text { margin: 0; font-size: 13px; color: var(--ink-mute); max-width: 70ch; }
.consent-text a { color: inherit; text-decoration: underline; }
.consent-actions { display: flex; gap: 8px; flex-shrink: 0; }
.consent-actions .btn { padding: 8px 16px; font-size: 13px; }

@media (max-width: 720px) {
  .subscribe-box { grid-template-columns: 1fr; }
  .consent { flex-direction: column; align-items: stretch; }
  .consent-actions .btn { flex: 1; }
}