:root {
  --bg: #fffaf6;
  --text: #210909;
  --muted: #6a5151;
  --soft: #f4ebe6;
  --ink: #1a0505;
  --ink-2: #2a0909;
  --red: #8b0000;
  --red-2: #b30f0f;
  --gold: #ffd700;
  --gold-2: #dcae36;
  --white: #ffffff;
  --line: rgba(139, 0, 0, 0.14);
  --dark-line: rgba(255, 215, 0, 0.2);
  --shadow: 0 18px 42px rgba(26, 5, 5, 0.14);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 3000; padding: 10px 14px; background: var(--gold); color: var(--ink); border-radius: 6px; font-weight: 800; }
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(26, 5, 5, 0.94);
  border-bottom: 1px solid var(--dark-line);
  backdrop-filter: blur(14px);
}
.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  font-weight: 900;
  white-space: nowrap;
}
.brand-logo {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  border: 1px solid var(--gold);
  background: linear-gradient(135deg, var(--red), #110202);
  overflow: hidden;
}
.brand-logo img {
  width: 34px;
  height: 34px;
  object-fit: contain;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 14px;
}
.site-nav a { padding: 8px 0; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--gold); border-bottom-color: var(--gold); }
.nav-toggle { display: none; width: 44px; height: 44px; border: 1px solid rgba(255,255,255,.24); border-radius: 8px; background: rgba(255,255,255,.08); }
.nav-toggle span:not(.sr-only) { display: block; width: 20px; height: 2px; margin: 4px auto; background: var(--white); }

.primary-btn, .ghost-btn, .nav-btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-weight: 900;
  cursor: pointer;
  border: 1px solid transparent;
}
.primary-btn, .nav-btn {
  background: linear-gradient(135deg, var(--gold), #edb545);
  color: #220606;
  box-shadow: 0 10px 24px rgba(255, 215, 0, 0.18);
}
.primary-btn { padding: 12px 22px; }
.nav-btn { padding: 9px 15px; min-height: 40px; }
.ghost-btn { padding: 12px 20px; color: var(--white); border-color: rgba(255,255,255,.34); background: rgba(255,255,255,.08); }
.primary-btn:hover, .nav-btn:hover, .ghost-btn:hover { transform: translateY(-1px); }

.section-shell, .section { padding: 82px 0; }
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 74% 22%, rgba(139,0,0,.34), transparent 34%),
    linear-gradient(135deg, #160303 0%, #260707 44%, #0d0202 100%);
  color: var(--white);
}
.hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: .55;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, .94fr) minmax(420px, .96fr);
  gap: 46px;
  align-items: start;
  min-height: 560px;
}
.eyebrow, .section-kicker {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
}
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 {
  margin: 0;
  max-width: 760px;
  font-size: 54px;
  line-height: 1.12;
  letter-spacing: 0;
}
h1 span { display: block; }
h2 { margin: 0; font-size: 34px; line-height: 1.25; letter-spacing: 0; }
h3 { margin: 0 0 8px; font-size: 20px; line-height: 1.35; letter-spacing: 0; }
.hero-copy p, .section-head p, .two-col p, .updates-layout p, .keyword-box p { color: var(--muted); }
.hero-copy { min-width: 0; }
.hero .hero-copy p { color: rgba(255,255,255,.82); font-size: 18px; max-width: 720px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 28px 0 34px; }
.hero-points {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.hero-points li {
  min-height: 88px;
  padding: 14px;
  border-radius: 8px;
  border: 1px solid var(--dark-line);
  background: rgba(255,255,255,.06);
}
.hero-points strong { display: block; color: var(--gold); }
.hero-points span { color: rgba(255,255,255,.72); font-size: 14px; }
.hero-visual {
  padding: 10px;
  border-radius: 8px;
  background: rgba(255,255,255,.08);
  border: 1px solid var(--dark-line);
  box-shadow: 0 28px 80px rgba(0,0,0,.35);
  max-width: 640px;
  justify-self: end;
  align-self: center;
}
.hero-main-img {
  width: 100%;
  height: clamp(300px, 22vw, 350px);
  object-fit: cover;
  object-position: center;
  border-radius: 6px;
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, .8fr);
  gap: 48px;
  align-items: center;
}
.media-card {
  margin: 0;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: var(--shadow);
}
.media-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.media-card figcaption { padding: 12px 14px; color: var(--muted); font-size: 14px; }
.section-head { max-width: 760px; margin-bottom: 34px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.dark-section {
  background: linear-gradient(180deg, var(--ink), var(--ink-2));
  color: var(--white);
}
.dark-section .section-head p { color: rgba(255,255,255,.72); }
.content-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.content-grid article {
  min-height: 210px;
  padding: 22px;
  border-radius: 8px;
  border: 1px solid var(--dark-line);
  background: rgba(255,255,255,.06);
}
.content-grid span { color: var(--gold); font-weight: 900; }
.content-grid p { margin: 0; color: rgba(255,255,255,.72); }

.guide-section { background: var(--white); }
.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 42px;
  align-items: start;
}
.guide-main > p:last-of-type { color: var(--muted); }
.guide-steps {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}
.guide-steps article {
  padding: 20px 22px;
  border-left: 4px solid var(--red);
  border-radius: 0 8px 8px 0;
  background: var(--soft);
}
.guide-steps p { margin: 0; color: var(--muted); }
.check-panel {
  position: sticky;
  top: 92px;
  padding: 24px;
  border-radius: 8px;
  color: var(--white);
  background: linear-gradient(180deg, #2b0707, #120303);
  border: 1px solid var(--dark-line);
  box-shadow: var(--shadow);
}
.check-panel h3 { color: var(--gold); }
.check-panel ol { margin: 14px 0 0; padding-left: 21px; }
.check-panel li + li { margin-top: 9px; }

.feature-section { background: #fff7f2; }
.feature-layout { align-items: stretch; }
.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 22px;
}
.feature-list span {
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--white);
  font-weight: 800;
}
.tall-card { align-self: stretch; }
.tall-card img { height: 100%; min-height: 320px; }

.updates-section { background: var(--bg); }
.updates-layout {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 42px;
}
.version-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.version-list article {
  padding: 20px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: 0 10px 28px rgba(26,5,5,.07);
}
.version-list time { display: block; color: var(--red); font-weight: 900; }
.version-list strong { display: block; margin: 5px 0; }
.version-list span { color: var(--muted); }

.keyword-section { padding-top: 0; }
.keyword-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, .78fr);
  gap: 30px;
  align-items: center;
  padding: 28px;
  border-radius: 8px;
  color: var(--white);
  background: linear-gradient(135deg, var(--ink), var(--red));
}
.keyword-box p:not(.section-kicker) { color: rgba(255,255,255,.76); }
.keyword-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.keyword-list li {
  padding: 13px 14px;
  border-radius: 8px;
  border: 1px solid var(--dark-line);
  background: rgba(255,255,255,.08);
  font-weight: 900;
}
.keyword-list span { display: block; margin-top: 4px; color: var(--gold); font-size: 13px; font-weight: 700; }

.faq-section { background: var(--white); }
.faq-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
details {
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--bg);
  overflow: hidden;
}
summary { cursor: pointer; padding: 18px 20px; font-weight: 900; }
details p { margin: 0; padding: 0 20px 18px; color: var(--muted); }

.links-section { background: #fff7f2; }
.links-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  align-items: center;
}
.friend-links { display: flex; flex-wrap: wrap; gap: 10px; }
.friend-links a {
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--white);
  color: #4a1818;
  font-weight: 800;
}
.friend-links a:hover { color: var(--red); border-color: var(--red); }
.cta-section {
  padding: 58px 0;
  color: var(--white);
  background: linear-gradient(135deg, var(--red), var(--ink));
}
.cta-box { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.cta-box h2 { font-size: 30px; }
.site-footer { background: #0d0202; color: rgba(255,255,255,.72); padding: 26px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 18px; font-size: 14px; }
.footer-inner p { margin: 0; }
.footer-inner a { color: var(--gold); font-weight: 900; }

.download-modal { position: fixed; inset: 0; z-index: 3000; display: none; align-items: center; justify-content: center; padding: 20px; background: rgba(10,2,2,.72); backdrop-filter: blur(10px); }
.download-modal.is-open { display: flex; }
.download-dialog { width: min(480px, 100%); border-radius: 8px; background: #fffdfb; color: var(--text); border: 1px solid rgba(255,215,0,.38); box-shadow: 0 28px 90px rgba(0,0,0,.45); overflow: hidden; }
.download-dialog header { padding: 22px 24px; background: linear-gradient(135deg, var(--ink), var(--red)); color: var(--white); }
.download-dialog h2 { margin: 0; font-size: 24px; }
.dialog-body { padding: 22px 24px; }
.dialog-body p { margin-top: 0; color: var(--muted); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 12px; padding: 0 24px 24px; }
.dialog-actions button { min-height: 42px; padding: 10px 16px; border-radius: 8px; cursor: pointer; font-weight: 900; }
.dialog-cancel { border: 1px solid rgba(26,5,5,.18); background: var(--white); color: var(--text); }
.dialog-confirm { border: 0; background: linear-gradient(135deg, var(--gold), #edb545); color: var(--ink); }
@media (max-width: 1000px) {
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute;
    top: 72px;
    left: 20px;
    right: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--dark-line);
    background: rgba(26,5,5,.98);
  }
  .site-nav.is-open { display: flex; }
  .site-nav a, .nav-btn { width: 100%; justify-content: flex-start; padding: 12px 14px; }
  .hero-grid, .two-col, .guide-layout, .updates-layout, .keyword-box, .links-layout { grid-template-columns: 1fr; }
  .hero-grid { min-height: auto; padding-top: 42px; padding-bottom: 42px; }
  .hero-visual { max-width: 760px; justify-self: stretch; }
  .hero-main-img { height: clamp(260px, 44vw, 360px); }
  .check-panel { position: static; }
  .content-grid, .version-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .container { width: min(100% - 28px, 1160px); }
  .header-inner { min-height: 64px; }
  .site-nav { top: 64px; left: 14px; right: 14px; }
  .brand span:last-child { max-width: 160px; white-space: normal; line-height: 1.2; }
  .section-shell, .section { padding: 58px 0; }
  h1 { font-size: 31px; line-height: 1.18; word-break: keep-all; }
  h2 { font-size: 26px; }
  .hero .hero-copy p { font-size: 16px; overflow-wrap: break-word; word-break: normal; }
  .hero-actions, .cta-box, .footer-inner { flex-direction: column; align-items: stretch; }
  .primary-btn, .ghost-btn { width: 100%; }
  .hero-points, .content-grid, .feature-list, .version-list, .faq-list { grid-template-columns: 1fr; }
  .hero-points li { min-height: auto; }
  .hero-main-img { height: 220px; }
  .dialog-actions { flex-direction: column-reverse; }
  .dialog-actions button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .001ms !important; animation-duration: .001ms !important; }
}
/* Whitehat protocol surfaces. These selectors are isolated from the original design. */
[data-seo-managed="download-link"] { text-decoration: none; }
.seo-home-news { padding: clamp(3rem, 6vw, 5rem) clamp(1rem, 4vw, 4rem); border-top: 1px solid var(--line, rgba(127,127,127,.22)); }
.seo-home-news-shell { width: min(100%, 1180px); margin: 0 auto; }
.seo-home-news-header { max-width: 760px; padding-bottom: 1.6rem; border-bottom: 1px solid var(--line, rgba(127,127,127,.22)); }
.seo-home-news-kicker { margin: 0 0 .65rem; color: var(--accent, var(--primary, #b30f0f)); font-size: .85rem; font-weight: 800; }
.seo-home-news-header h2 { margin: 0; }
.seo-home-news-header > p:last-child { margin: .8rem 0 0; color: var(--muted, #6a5151); }
.seo-home-news:has(.seo-home-news-card) .seo-home-news-header-empty { display: none; }
.seo-home-news-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); gap: 1rem; margin-top: 1.5rem; }
.seo-home-news-card, .seo-home-news-empty { margin: 0; padding: 1.35rem; border: 1px solid var(--line, rgba(127,127,127,.22)); border-radius: 8px; background: var(--panel, rgba(255,255,255,.82)); box-shadow: var(--shadow, 0 18px 42px rgba(0,0,0,.14)); }
.seo-home-news-card h3 { margin: 0; }
.seo-home-news-card time { display: block; margin-top: .65rem; color: var(--accent, var(--primary, #b30f0f)); font-size: .9rem; }
.seo-home-news-card p { margin: .75rem 0 1rem; color: var(--muted, #6a5151); }
.seo-home-news-card a { color: var(--accent, var(--primary, #b30f0f)); font-weight: 800; text-underline-offset: .2em; }
.seo-home-news-list:has(.seo-home-news-card) + .seo-home-news-empty { display: none; }
.seo-home-news-empty { margin-top: 1.5rem; color: var(--muted, #6a5151); text-align: center; }
body.seo-news-page { min-height: 100vh; display: flex; flex-direction: column; background: var(--bg, var(--paper, #fafafa)); color: var(--text, var(--ink, #2b1a12)); }
.seo-news-sitebar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem clamp(1rem, 4vw, 4rem); border-bottom: 1px solid var(--line, rgba(127,127,127,.22)); background: var(--panel, rgba(255,255,255,.82)); }
.seo-news-sitebar a { color: inherit; font-weight: 800; text-decoration: none; }
.seo-news-sitebar-nav { display: flex; align-items: center; gap: 1rem; }
.seo-news-sitebar-nav a:last-child { padding: .55rem .9rem; border: 1px solid var(--accent, var(--primary, #b30f0f)); border-radius: 8px; color: var(--accent, var(--primary, #b30f0f)); }
.seo-news-main { width: min(100%, 1100px); flex: 1; margin: 0 auto; padding: clamp(2.5rem, 6vw, 5rem) 1rem; }
.seo-news-header { max-width: 760px; padding-bottom: 1.6rem; border-bottom: 1px solid var(--line, rgba(127,127,127,.22)); }
.seo-news-kicker { margin: 0 0 .65rem; color: var(--accent, var(--primary, #b30f0f)); font-size: .85rem; font-weight: 800; }
.seo-news-header h1, .seo-news-detail h1 { margin: 0; }
.seo-news-header p { margin: .8rem 0 0; color: var(--muted, #6a5151); }
.seo-news-header:has(+ .seo-news-list .seo-news-card) .seo-news-header-empty { display: none; }
.seo-news-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); gap: 1rem; margin-top: 1.5rem; }
.seo-news-card, .seo-news-empty-state, .seo-news-detail { border: 1px solid var(--line, rgba(127,127,127,.22)); border-radius: 8px; background: var(--panel, rgba(255,255,255,.82)); box-shadow: var(--shadow, 0 18px 42px rgba(0,0,0,.14)); }
.seo-news-card { padding: 1.35rem; }
.seo-news-card h2 { margin: 0; font-size: 1.25rem; }
.seo-news-card time { display: block; margin-top: .65rem; color: var(--accent, var(--primary, #b30f0f)); font-size: .9rem; }
.seo-news-card p { margin: .75rem 0 1rem; color: var(--muted, #6a5151); }
.seo-news-card a, .seo-news-back a { color: var(--accent, var(--primary, #b30f0f)); font-weight: 800; text-underline-offset: .2em; }
.seo-news-empty-state { margin: 1.5rem 0 0; padding: 2rem 1.25rem; color: var(--muted, #6a5151); text-align: center; }
.seo-news-list:has(.seo-news-card) + .seo-news-empty-state { display: none; }
.seo-news-detail { width: min(100%, 860px); margin: 0 auto; padding: clamp(1.5rem, 4vw, 3rem); }
.seo-news-date { margin: .75rem 0 1.5rem; color: var(--muted, #6a5151); }
.seo-news-plain-text { white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.9; }
.seo-news-back { margin: 2rem 0 0; }
.seo-download-modal { position: fixed; inset: 0; z-index: 10000; display: flex; align-items: center; justify-content: center; padding: 1rem; background: rgba(0,0,0,.62); }
.seo-download-dialog { width: min(430px, 100%); padding: 1.35rem; border: 1px solid var(--line, rgba(127,127,127,.22)); border-radius: 8px; background: var(--panel, #fff); color: var(--text, var(--ink, #1f2937)); box-shadow: var(--shadow, 0 18px 42px rgba(0,0,0,.18)); }
.seo-download-dialog h3 { margin: 0 0 .7rem; }
.seo-download-dialog p { margin: 0; }
.seo-download-actions { display: flex; justify-content: flex-end; gap: .75rem; margin-top: 1.1rem; }
.seo-download-actions button { padding: .6rem .95rem; border: 1px solid var(--line, rgba(127,127,127,.22)); border-radius: 6px; color: inherit; background: transparent; cursor: pointer; }
.seo-download-actions button:last-child { border-color: var(--accent, var(--primary, #b30f0f)); color: var(--accent, var(--primary, #b30f0f)); }
@media (max-width: 640px) { .seo-news-sitebar { align-items: flex-start; flex-direction: column; } .seo-news-sitebar-nav { width: 100%; justify-content: space-between; } .seo-home-news, .seo-news-main { padding-left: .75rem; padding-right: .75rem; } .seo-home-news-list, .seo-news-list { grid-template-columns: 1fr; } }