:root {
  --void: #071017;
  --night: #0b1721;
  --panel: #102331;
  --panel-raised: #142d3e;
  --line: rgba(186, 222, 232, 0.18);
  --line-strong: rgba(186, 222, 232, 0.36);
  --ink: #f2f8f7;
  --muted: #b1c3c8;
  --dim: #7f989f;
  --signal: #a9e85a;
  --signal-ink: #102310;
  --cyan: #5ed9e8;
  --amber: #ffc76a;
  --danger: #ff8c93;
  --violet: #b4a4ff;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans CJK SC", "Microsoft YaHei", Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --radius: 1.25rem;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--void); }
body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 83% 7%, rgba(94, 217, 232, 0.13), transparent 25rem),
    radial-gradient(circle at 5% 37%, rgba(169, 232, 90, 0.085), transparent 30rem),
    linear-gradient(180deg, #09141d 0%, var(--void) 62rem);
  font-family: var(--sans);
  line-height: 1.65;
}
::selection { color: var(--signal-ink); background: var(--signal); }
a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--cyan); outline-offset: 4px; }
code { font-family: var(--mono); font-size: 0.88em; background: rgba(94,217,232,0.12); padding: 0.1em 0.3em; border-radius: 0.3em; }

.shell { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 30; top: 12px; left: 12px; padding: 0.65rem 0.85rem; color: var(--signal-ink); background: var(--signal); border-radius: 0.5rem; transform: translateY(-180%); transition: transform 160ms ease; }
.skip-link:focus { transform: translateY(0); }

/* HEADER */
.site-header { position: sticky; z-index: 20; top: 0; border-bottom: 1px solid rgba(186,222,232,0.1); background: rgba(7,16,23,0.84); backdrop-filter: blur(18px); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.7rem 0; }
.brand { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; font-weight: 700; font-size: 1.05rem; }
.brand-mark { display: inline-flex; align-items: center; justify-content: center; width: 2.1rem; height: 2.1rem; border-radius: 0.6rem; background: linear-gradient(135deg, var(--cyan), var(--signal)); color: var(--void); font-weight: 800; font-size: 0.7rem; letter-spacing: 0.02em; }
.site-nav { display: flex; gap: 1.2rem; align-items: center; }
.site-nav a { text-decoration: none; font-size: 0.92rem; color: var(--muted); transition: color 160ms; }
.site-nav a:hover { color: var(--ink); }
.language-link { font-weight: 600; color: var(--cyan) !important; }

/* HERO */
.hero { padding: 5rem 0 3.5rem; text-align: center; }
.badge { display: inline-block; padding: 0.35rem 0.9rem; border-radius: 2rem; background: rgba(169,232,90,0.12); border: 1px solid rgba(169,232,90,0.3); color: var(--signal); font-size: 0.82rem; font-weight: 700; letter-spacing: 0.06em; margin-bottom: 1.5rem; }
.hero h1 { font-size: clamp(1.8rem, 4vw, 3rem); line-height: 1.15; margin: 0 0 1.2rem; }
.lede { font-size: 1.1rem; color: var(--muted); max-width: 42rem; margin: 0 auto 2.5rem; }
.hero-stats { display: flex; flex-wrap: wrap; justify-content: center; gap: 1.5rem; }
.stat { display: flex; flex-direction: column; gap: 0.2rem; text-align: center; }
.stat-label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--dim); }
.stat-value { font-size: 1.05rem; font-weight: 600; color: var(--ink); }

/* SECTIONS */
.section { padding: 3.5rem 0; border-top: 1px solid var(--line); }
.section.alt { background: rgba(16,35,49,0.3); }
.section-kicker { display: block; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; color: var(--cyan); margin-bottom: 0.8rem; }
.section h2 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); line-height: 1.3; margin: 0 0 1.8rem; max-width: 50rem; }
.section h3 { font-size: 1.05rem; margin: 1.5rem 0 0.6rem; }
.section p { color: var(--muted); }

/* CLAIM BOX */
.claim-box { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.8rem; margin-bottom: 1.2rem; }
.claim-box p { color: var(--ink); margin: 0 0 1rem; }
.claim-box p:last-child { margin: 0; }
.outcome { display: inline-block; padding: 0.3rem 0.7rem; border-radius: 0.4rem; font-size: 0.85rem; margin: 0.25rem 0.4rem 0.25rem 0; }
.outcome-detected { background: rgba(169,232,90,0.15); border: 1px solid var(--signal); color: var(--signal); }
.outcome-null { background: rgba(94,217,232,0.12); border: 1px solid var(--cyan); color: var(--cyan); }
.outcome-inconclusive { background: rgba(255,199,106,0.12); border: 1px solid var(--amber); color: var(--amber); }
.note { font-size: 0.88rem; color: var(--dim); }

/* UNIQUENESS GRID */
.uniq-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.2rem; margin-bottom: 2rem; }
.uniq-card { background: var(--panel); border: 1px solid var(--line); border-radius: 1rem; padding: 1.4rem; }
.uniq-icon { display: inline-flex; align-items: center; justify-content: center; width: 2rem; height: 2rem; border-radius: 50%; background: rgba(255,140,147,0.15); color: var(--danger); font-weight: 700; margin-bottom: 0.8rem; }
.uniq-card h3 { margin: 0 0 0.5rem; }
.uniq-card p { font-size: 0.9rem; }
.why-xmm { background: var(--panel-raised); border: 1px solid var(--line); border-radius: 1rem; padding: 1.5rem; }
.why-xmm ul { padding-left: 1.2rem; }
.why-xmm li { margin-bottom: 0.5rem; color: var(--muted); }

/* GATE TABLE */
.gate-table { width: 100%; border-collapse: collapse; margin-bottom: 2rem; font-size: 0.9rem; }
.gate-table th { text-align: left; padding: 0.7rem 0.6rem; border-bottom: 2px solid var(--line-strong); color: var(--dim); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; }
.gate-table td { padding: 0.7rem 0.6rem; border-bottom: 1px solid var(--line); color: var(--muted); }
.gate-table tr.gate-narrowed td:first-child { border-left: 3px solid var(--amber); }
.gate-table tr.gate-open td:first-child { border-left: 3px solid var(--cyan); }
.gate-table tr.gate-closed td:first-child { border-left: 3px solid var(--dim); }
.status-tag { display: inline-block; padding: 0.15rem 0.5rem; border-radius: 0.3rem; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.04em; }
.status-tag.narrowed { background: rgba(255,199,106,0.15); color: var(--amber); }
.status-tag.open { background: rgba(94,217,232,0.12); color: var(--cyan); }
.status-tag.closed { background: rgba(127,152,159,0.15); color: var(--dim); }

/* MIN-GATE */
.min-gate-box { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.5rem; }
.min-gate-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; margin: 1rem 0; }
.mg-cell { border-radius: 0.8rem; padding: 1rem; text-align: center; border: 1px solid var(--line); }
.mg-cell.good { background: rgba(169,232,90,0.08); border-color: rgba(169,232,90,0.3); }
.mg-cell.adequate { background: rgba(94,217,232,0.06); border-color: rgba(94,217,232,0.2); }
.mg-label { display: block; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--dim); margin-bottom: 0.3rem; }
.mg-grade { font-size: 1.1rem; font-weight: 800; }
.mg-cell.good .mg-grade { color: var(--signal); }
.mg-cell.adequate .mg-grade { color: var(--cyan); }

/* ELO */
.elo-match { display: flex; flex-direction: column; gap: 1rem; margin-bottom: 2.5rem; }
.match-entry { display: flex; align-items: flex-start; gap: 1rem; background: var(--panel); border: 1px solid var(--line); border-radius: 1rem; padding: 1.2rem 1.5rem; }
.match-entry.win { border-left: 4px solid var(--signal); }
.match-result { flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center; padding: 0.3rem 0.8rem; border-radius: 0.4rem; font-weight: 800; font-size: 0.78rem; letter-spacing: 0.06em; background: var(--signal); color: var(--signal-ink); }
.match-detail p { font-size: 0.88rem; margin: 0.3rem 0 0; }
.elo-ladder h3 { margin-bottom: 1.2rem; }
.bar-chart { display: flex; flex-direction: column; gap: 0.5rem; }
.bar-row { display: flex; align-items: center; gap: 0.8rem; }
.bar-label { flex-shrink: 0; width: 70px; font-size: 0.85rem; font-weight: 600; text-align: right; color: var(--muted); }
.bar { height: 2rem; border-radius: 0.4rem; background: linear-gradient(90deg, rgba(94,217,232,0.3), rgba(94,217,232,0.15)); display: flex; align-items: center; padding-left: 0.8rem; }
.bar-row.highlight .bar { background: linear-gradient(90deg, var(--signal), rgba(169,232,90,0.4)); }
.bar-row.highlight .bar-label { color: var(--signal); }
.bar-value { font-size: 0.82rem; font-weight: 600; color: var(--ink); }

/* BOUNDARY */
.boundary-section { background: rgba(16,35,49,0.5); border-top: 1px solid var(--line); }
.boundary-section p { color: var(--muted); max-width: 50rem; }

/* BUTTON */
.button { display: inline-block; margin-top: 1.5rem; padding: 0.7rem 1.5rem; border-radius: 0.6rem; background: var(--panel-raised); border: 1px solid var(--line-strong); color: var(--ink); text-decoration: none; font-weight: 600; transition: background 160ms, border-color 160ms; }
.button:hover { background: var(--panel); border-color: var(--cyan); }

/* FOOTER */
.site-footer { border-top: 1px solid var(--line); padding: 1.5rem 0; }
.footer-row { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; }
.footer-row p { font-size: 0.8rem; color: var(--dim); margin: 0; }

/* RESPONSIVE */
@media (max-width: 640px) {
  .header-row { align-items: flex-start; flex-direction: column; gap: 0.5rem; }
  .site-nav { width: 100%; flex-wrap: wrap; gap: 0.45rem 0.75rem; }
  .site-nav a { font-size: 0.8rem; }
  .hero { padding: 3rem 0 2rem; }
  .hero-stats { gap: 1rem; }
  .uniq-grid { grid-template-columns: 1fr; }
  .gate-table { font-size: 0.78rem; }
  .gate-table th, .gate-table td { padding: 0.5rem 0.3rem; }
  .bar-label { width: 50px; font-size: 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}