/* 三公信誉平台 - 主站样式 | 符合语义化与可访问性 */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-accent: #f59e0b;
  --color-bg: #0f172a;
  --color-bg-card: #1e293b;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --header-h: 72px;
}

*, *::before, *::after { box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font-sans); background: var(--color-bg); color: var(--color-text); line-height: 1.6; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header { position: sticky; top: 0; z-index: 100; background: rgba(15, 23, 42, 0.95); border-bottom: 1px solid rgba(255,255,255,0.08); padding: 0.75rem 1rem; }
.site-header .inner { max-width: var(--max-width); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.site-logo { height: 48px; width: auto; }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 1.5rem; }
.site-nav a { color: var(--color-text); font-weight: 500; }
.site-nav a:hover { color: var(--color-accent); text-decoration: none; }

.menu-toggle { display: none; align-items: center; justify-content: center; width: 44px; height: 44px; padding: 0; border: none; background: transparent; color: var(--color-text); cursor: pointer; border-radius: 4px; }
.menu-toggle:hover, .menu-toggle:focus-visible { background: rgba(255,255,255,0.08); color: var(--color-text); }
.menu-toggle-icon { position: relative; width: 22px; height: 2px; background: currentColor; border-radius: 1px; }
.menu-toggle-icon::before, .menu-toggle-icon::after { content: ""; position: absolute; left: 0; width: 22px; height: 2px; background: currentColor; border-radius: 1px; }
.menu-toggle-icon::before { top: -6px; }
.menu-toggle-icon::after { top: 6px; }
.header-brand { display: none; font-size: 1.125rem; font-weight: 600; color: var(--color-text); text-decoration: none; flex: 1; text-align: center; }
.header-brand:hover { color: var(--color-accent); text-decoration: none; }

.drawer-overlay, .drawer { display: none; }
@media (max-width: 768px) {
  .site-header .header-logo, .site-header .site-nav { display: none !important; }
  .site-header .header-brand { display: block !important; order: 1; flex: 1; min-width: 0; text-align: center; }
  .site-header .menu-toggle { display: flex !important; order: 2; flex-shrink: 0; }
  .site-header .inner { justify-content: flex-start; }
  .drawer-overlay { display: block; position: fixed; inset: 0; z-index: 150; background: rgba(0,0,0,0.4); opacity: 0; transition: opacity 0.25s ease; pointer-events: none; }
  .drawer-overlay.is-open { opacity: 1; pointer-events: auto; }
  .drawer { display: block; position: fixed; top: 0; left: auto; right: 0; z-index: 160; width: 280px; max-width: 85vw; height: 100%; direction: ltr; background: var(--color-bg-card); border-left: 1px solid rgba(255,255,255,0.08); box-shadow: -4px 0 24px rgba(0,0,0,0.3); transform: translateX(100%); transition: transform 0.25s ease; overflow-y: auto; padding: 1rem 0 2rem; }
  .drawer.is-open { transform: translateX(0); }
  .drawer-close { position: absolute; top: 0.75rem; right: 0.75rem; width: 44px; height: 44px; padding: 0; border: none; background: transparent; color: var(--color-text); font-size: 1.5rem; line-height: 1; cursor: pointer; border-radius: 4px; }
  .drawer-close:hover, .drawer-close:focus-visible { background: rgba(255,255,255,0.08); }
  .drawer-nav ul { list-style: none; margin: 0; padding: 2.5rem 1.25rem 0; }
  .drawer-nav li { border-bottom: 1px solid rgba(255,255,255,0.06); }
  .drawer-nav a { display: block; padding: 0.9rem 0; color: var(--color-text); font-weight: 500; font-size: 1rem; }
  .drawer-nav a:hover { color: var(--color-accent); text-decoration: none; }
}

.skip-link { position: absolute; top: -3rem; left: 1rem; z-index: 200; padding: 0.5rem 1rem; background: var(--color-primary); color: #fff; border-radius: 4px; font-size: 0.875rem; transition: top 0.2s; }
.skip-link:focus { top: 1rem; outline: 2px solid var(--color-accent); outline-offset: 2px; }
.hero { position: relative; width: 100%; min-height: 280px; max-height: 520px; overflow: hidden; background: var(--color-bg-card); }
.hero img { width: 100%; height: auto; object-fit: cover; object-position: center top; }
.hero-overlay { position: absolute; bottom: 0; left: 0; right: 0; padding: 2rem 1rem 1.5rem; background: linear-gradient(transparent, rgba(0,0,0,0.75)); color: #fff; }
.hero-title { margin: 0 0 0.5rem; font-size: clamp(1.5rem, 4vw, 2.25rem); font-weight: 700; line-height: 1.2; }
.hero-desc { margin: 0; font-size: 1rem; opacity: 0.95; }
.main { max-width: var(--max-width); margin: 0 auto; padding: 0 1rem 2rem; }
.section { padding: 2.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
.section:last-of-type { border-bottom: none; }
.inner { max-width: var(--max-width); margin: 0 auto; }
.section-title { font-size: 1.5rem; margin: 0 0 0.75rem; line-height: 1.3; color: var(--color-text); }
.section-desc { margin: 0 0 1.5rem; color: var(--color-text-muted); max-width: 65ch; }
.intro-content p { margin: 0 0 1rem; max-width: 72ch; }
.intro-content p:last-child { margin-bottom: 0; }
.page-title { font-size: 1.75rem; margin: 0 0 1rem; line-height: 1.3; }
.card { background: var(--color-bg-card); border-radius: 8px; padding: 1.5rem; margin-bottom: 1.5rem; border: 1px solid rgba(255,255,255,0.06); }
.card-title { font-size: 1.125rem; margin: 0 0 0.5rem; }
.card-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.25rem; }
.card-grid .card-item { margin: 0; }
.card-grid .card { margin-bottom: 0; height: 100%; display: flex; flex-direction: column; }
.card-grid .card p { margin: 0; flex: 1; font-size: 0.9375rem; color: var(--color-text-muted); }
.content-block { max-width: 72ch; }
.content-block ul { margin: 0 0 1rem; padding-left: 1.25rem; }
.content-block li { margin-bottom: 0.5rem; }
.link-list { list-style: none; margin: 0 0 1rem; padding: 0; }
.link-list li { margin-bottom: 0.75rem; }
.link-list a { color: var(--color-text); font-weight: 500; }
.link-list a:hover { color: var(--color-accent); text-decoration: none; }
.game-list { margin: 0 0 1rem; padding-left: 1.25rem; max-width: 65ch; }
.game-list li { margin-bottom: 0.5rem; }
.section-toc { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.toc-title { margin-bottom: 0.75rem; font-size: 1.125rem; }
.toc-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 0.5rem 1.5rem; }
.toc-list a { color: var(--color-text); font-size: 0.9375rem; }
.toc-list a:hover { color: var(--color-accent); text-decoration: none; }
.btn { display: inline-block; padding: 0.6rem 1.2rem; background: var(--color-primary); color: #fff; border: none; border-radius: 6px; font-size: 1rem; cursor: pointer; font-family: inherit; }
.btn:hover { background: var(--color-primary-dark); text-decoration: none; color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--color-primary); color: var(--color-primary); margin-left: 0.5rem; }
.btn-outline:hover { background: rgba(37, 99, 235, 0.15); color: var(--color-text); }
input[type="text"], input[type="email"], input[type="url"], input[type="password"], textarea { width: 100%; max-width: 400px; padding: 0.6rem 0.75rem; border: 1px solid rgba(255,255,255,0.2); border-radius: 6px; background: rgba(255,255,255,0.05); color: var(--color-text); font-family: inherit; font-size: 1rem; }
label { display: block; margin-bottom: 0.25rem; color: var(--color-text-muted); }
.article-list { list-style: none; margin: 0; padding: 0; }
.article-list li { padding: 1rem 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
.article-list li:last-child { border-bottom: none; }
.article-list a { color: var(--color-text); font-weight: 500; }
.article-list a:hover { color: var(--color-accent); text-decoration: none; }
.article-meta { font-size: 0.875rem; color: var(--color-text-muted); margin-top: 0.25rem; }
.breadcrumb { margin: 0 0 1rem; font-size: 0.875rem; color: var(--color-text-muted); }
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-accent); text-decoration: none; }
.breadcrumb [aria-current="page"] { color: var(--color-text); }
.article-header { margin-bottom: 1.5rem; }
.article-byline { margin: 0.5rem 0 0; font-size: 0.875rem; color: var(--color-text-muted); }
.article-meta-sep { margin: 0 0.5rem; opacity: 0.7; }
.article-body { margin-bottom: 1.5rem; }
.article-body h2 { font-size: 1.25rem; margin: 1.5rem 0 0.75rem; }
.article-body h3 { font-size: 1.1rem; margin: 1.25rem 0 0.5rem; }
.article-body ul, .article-body ol { margin: 0.5rem 0 1rem; padding-left: 1.5rem; }
.article-body table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.9375rem; }
.article-body th, .article-body td { border: 1px solid rgba(255,255,255,0.15); padding: 0.5rem 0.75rem; text-align: left; }
.article-body th { background: rgba(255,255,255,0.05); font-weight: 600; }
.related-reading { margin-bottom: 1.5rem; }
.related-reading .section-title { font-size: 1.125rem; margin-bottom: 0.75rem; }
.related-links { list-style: none; margin: 0; padding: 0; }
.related-links li { margin-bottom: 0.5rem; }
.related-links a { color: var(--color-text); }
.related-links a:hover { color: var(--color-accent); text-decoration: none; }
.article-disclaimer { margin-bottom: 1.5rem; background: rgba(239, 68, 68, 0.08); border-color: rgba(239, 68, 68, 0.2); }
.article-disclaimer .section-title { font-size: 1.125rem; margin-bottom: 0.75rem; }
.article-disclaimer p { margin: 0; font-size: 0.875rem; color: var(--color-text-muted); line-height: 1.6; }
.article-list-item { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 1rem; }
.article-list-item .article-list-title { flex: 1; min-width: 0; order: 1; }
.article-list-item .article-actions { display: inline-flex; gap: 0.5rem; align-items: center; order: 2; }
.article-list-item .article-meta { width: 100%; margin-top: 0; order: 3; }
.btn-small { padding: 0.35rem 0.75rem; font-size: 0.875rem; }
.btn-danger { background: #b91c1c; color: #fff; }
.btn-danger:hover { background: #991b1b; color: #fff; text-decoration: none; }
.site-footer { margin-top: 0; padding: 2rem 1rem; border-top: 1px solid rgba(255,255,255,0.08); text-align: center; color: var(--color-text-muted); font-size: 0.875rem; }
.site-footer a { color: var(--color-text-muted); }
.footer-inner { max-width: var(--max-width); margin: 0 auto; }
.footer-nav ul { list-style: none; margin: 0 0 1rem; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem 1.5rem; }
.footer-nav a:hover { color: var(--color-text); }
.footer-copy { margin: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.faq-list dt { font-weight: 600; margin-top: 1rem; margin-bottom: 0.5rem; }
.faq-list dd { margin: 0; color: var(--color-text-muted); }
.faq-inline dd { margin-bottom: 0.75rem; }
.faq-inline dt:not(:first-child) { margin-top: 1.25rem; }