:root {
  --black: #090b0f;
  --ink: #17191e;
  --paper: #f4f1eb;
  --white: #fffdf9;
  --orange: #f25418;
  --amber: #ffb000;
  --muted: #68707b;
  --line: rgba(23, 25, 30, 0.12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.shell { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.topbar { position: sticky; top: 0; z-index: 30; height: 72px; color: #fff; background: rgba(9, 11, 15, 0.92); border-bottom: 1px solid rgba(255,255,255,.1); backdrop-filter: blur(16px); }
.topbar-inner { display: flex; height: 100%; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 950; }
.brand img { width: 39px; height: 39px; object-fit: contain; }
.nav { display: flex; align-items: center; gap: 8px; }
.nav a { padding: 10px 13px; color: rgba(255,255,255,.7); border-radius: 10px; font-size: 14px; font-weight: 800; }
.nav a:hover { color: #fff; background: rgba(255,255,255,.08); }
.nav .admin { color: #111; background: var(--amber); }
.page-hero { padding: 88px 0 72px; color: #fff; background: linear-gradient(120deg, rgba(9,11,15,.97), rgba(9,11,15,.72)), url("hero-arena-2026.webp") center/cover; }
.page-hero .label, .article-label { color: var(--amber); font-size: 12px; font-weight: 950; letter-spacing: .16em; }
.page-hero h1 { max-width: 820px; margin: 16px 0 0; font-size: clamp(42px, 6vw, 68px); line-height: 1.06; letter-spacing: -.05em; }
.page-hero h1 em { color: var(--orange); font-style: normal; }
.page-hero p { max-width: 670px; margin: 20px 0 0; color: rgba(255,255,255,.68); font-size: 18px; line-height: 1.8; }
.filter-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.filter-row a { padding: 9px 13px; color: rgba(255,255,255,.78); border: 1px solid rgba(255,255,255,.18); border-radius: 999px; font-size: 13px; font-weight: 800; }
.content-section { padding: 76px 0 100px; }
.hub-heading { display: grid; grid-template-columns: 190px 1fr 1fr; gap: 24px; align-items: end; margin-bottom: 28px; }
.hub-heading > span { color: var(--orange); font-size: 11px; font-weight: 950; letter-spacing: .15em; }
.hub-heading h2 { margin: 0; font-size: 38px; letter-spacing: -.04em; }
.hub-heading p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.tool-heading { margin-top: 76px; padding-top: 58px; border-top: 1px solid var(--line); }
.article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.article-card { display: flex; min-height: 360px; flex-direction: column; overflow: hidden; background: var(--white); border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 18px 48px rgba(9,11,15,.07); transition: transform .18s ease, box-shadow .18s ease; }
.article-card:hover { transform: translateY(-5px); box-shadow: 0 26px 58px rgba(9,11,15,.12); }
.article-cover { min-height: 170px; padding: 24px; color: #fff; background: linear-gradient(145deg,#171b21,#090b0f); }
.article-card:nth-child(2) .article-cover { color: #17191e; background: var(--amber); }
.article-card:nth-child(3) .article-cover { background: var(--orange); }
.article-cover span { font-family: "Arial Black", Impact, sans-serif; font-size: 62px; line-height: 1; opacity: .22; }
.article-card-body { display: flex; flex: 1; flex-direction: column; padding: 24px; }
.article-meta { color: var(--orange); font-size: 12px; font-weight: 900; }
.article-card h2 { margin: 13px 0 0; font-size: 23px; line-height: 1.35; }
.article-card p { margin: 12px 0 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.article-more { margin-top: auto; padding-top: 22px; font-size: 14px; font-weight: 900; }
.article-more span { color: var(--orange); }
.guide-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.guide-grid a { display: grid; min-height: 180px; grid-template-columns: 50px 1fr 34px; gap: 18px; align-items: start; padding: 26px; background: var(--white); border: 1px solid var(--line); border-radius: 18px; transition: transform .18s ease, box-shadow .18s ease; }
.guide-grid a:first-child { color: #fff; background: var(--ink); }
.guide-grid a:hover { transform: translateY(-4px); box-shadow: 0 20px 46px rgba(9,11,15,.1); }
.guide-grid b { color: var(--orange); font-size: 13px; }
.guide-grid span { color: var(--orange); font-size: 11px; font-weight: 900; letter-spacing: .08em; }
.guide-grid h2 { margin: 10px 0 0; font-size: 22px; line-height: 1.35; }
.guide-grid p { margin: 9px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.guide-grid a:first-child p { color: rgba(255,255,255,.55); }
.guide-grid i { align-self: center; color: var(--orange); font-size: 24px; font-style: normal; }
.empty-note { padding: 34px; color: var(--muted); background: var(--white); border: 1px dashed var(--line); border-radius: 18px; text-align: center; }
.article-hero { padding: 84px 0 56px; color: #fff; background: var(--black); }
.breadcrumbs { color: rgba(255,255,255,.46); font-size: 13px; }
.breadcrumbs a { color: rgba(255,255,255,.72); }
.article-hero h1 { max-width: 900px; margin: 22px 0 0; font-size: clamp(38px, 5.6vw, 64px); line-height: 1.12; letter-spacing: -.045em; }
.article-summary { max-width: 800px; margin: 22px 0 0; color: rgba(255,255,255,.66); font-size: 18px; line-height: 1.8; }
.article-info { display: flex; flex-wrap: wrap; gap: 12px 22px; margin-top: 26px; color: rgba(255,255,255,.44); font-size: 13px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 760px) 260px; gap: 56px; align-items: start; padding: 70px 0 110px; }
.article-body { min-width: 0; }
.article-body h2 { margin: 48px 0 16px; font-size: 30px; line-height: 1.3; letter-spacing: -.025em; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin: 30px 0 12px; font-size: 21px; }
.article-body p { margin: 0 0 18px; color: #333944; font-size: 17px; line-height: 1.95; }
.article-body p a,
.article-body li a {
  color: var(--orange);
  font-weight: 800;
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 4px;
}
.article-body p a:hover,
.article-body li a:hover,
.article-body p a:focus-visible,
.article-body li a:focus-visible {
  color: #b83208;
  text-decoration-thickness: 2px;
}
.article-body ul, .article-body ol { margin: 0 0 24px; padding-left: 24px; }
.article-body li { margin: 9px 0; color: #333944; font-size: 16px; line-height: 1.8; }
.article-body blockquote { margin: 30px 0; padding: 20px 24px; color: #43200e; background: #fff0e7; border-left: 4px solid var(--orange); border-radius: 0 14px 14px 0; font-size: 18px; font-weight: 800; line-height: 1.7; }
.article-body table { width: 100%; margin: 24px 0 30px; overflow: hidden; border-collapse: collapse; background: var(--white); border-radius: 14px; }
.article-body th, .article-body td { padding: 14px; border: 1px solid var(--line); font-size: 14px; line-height: 1.6; text-align: left; vertical-align: top; }
.article-body th { background: #17191e; color: #fff; }
.article-cta { margin-top: 54px; padding: 30px; color: #fff; background: linear-gradient(135deg, var(--orange), #c93708); border-radius: 20px; }
.article-cta h2 { margin: 0; font-size: 27px; }
.article-cta p { margin-top: 10px; color: rgba(255,255,255,.75); }
.article-cta a { display: inline-flex; margin-top: 10px; padding: 12px 17px; color: #111; background: var(--amber); border-radius: 10px; font-weight: 900; }
.toc { position: sticky; top: 96px; padding: 22px; background: var(--white); border: 1px solid var(--line); border-radius: 16px; }
.toc strong { display: block; margin-bottom: 13px; }
.toc a { display: block; padding: 8px 0; color: var(--muted); font-size: 13px; line-height: 1.5; border-bottom: 1px solid var(--line); }
.toc a:last-child { border-bottom: 0; }
.footer { padding: 38px 0; color: rgba(255,255,255,.52); background: var(--black); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; font-size: 13px; }
.footer a { color: rgba(255,255,255,.8); }
@media (max-width: 900px) {
  .article-grid { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
  .hub-heading { grid-template-columns: 1fr; gap: 8px; }
}
@media (max-width: 640px) {
  .shell { width: min(100% - 28px, 1120px); }
  .topbar { height: 64px; }
  .brand img { width: 34px; height: 34px; }
  .nav a:not(.admin) { display: none; }
  .nav .admin { padding: 9px 11px; font-size: 12px; }
  .page-hero, .article-hero { padding-top: 64px; }
  .article-grid { grid-template-columns: 1fr; }
  .guide-grid { grid-template-columns: 1fr; }
  .guide-grid a { grid-template-columns: 38px 1fr 24px; padding: 22px; }
  .article-layout { padding-top: 48px; }
  .article-body p { font-size: 16px; }
  .article-body table { display: block; overflow-x: auto; }
  .footer-inner { align-items: flex-start; flex-direction: column; }
}