/* VHOLUME Wiki - 暗色主题，主色钢灰蓝 HSL 205 25% 42% */

:root {
  --nav-theme: 205 25% 42%;
  --nav-theme-light: 205 25% 58%;

  /* 暗色主题（默认） */
  --bg: 220 15% 8%;
  --bg-elev: 220 15% 12%;
  --bg-elev-2: 220 15% 16%;
  --fg: 0 0% 90%;
  --fg-muted: 0 0% 65%;
  --border: 220 12% 22%;
  --accent: var(--nav-theme);
  --accent-light: var(--nav-theme-light);
  --danger: 0 60% 50%;
  --success: 152 50% 45%;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 8px;
  --shadow: 0 4px 12px hsl(220 15% 4% / 0.5);
  --content-max: 1200px;
  --reading-max: 760px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: hsl(var(--bg));
  color: hsl(var(--fg));
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

img, video { max-width: 100%; height: auto; display: block; }

.container { max-width: var(--content-max); margin: 0 auto; padding: 0 24px; }
.reading  { max-width: var(--reading-max); margin: 0 auto; padding: 0 24px; }

/* ========== Header / Nav ========== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: hsl(var(--bg-elev) / 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid hsl(var(--border));
}
.nav {
  display: flex; align-items: center; gap: 24px;
  padding: 14px 0;
}
.nav-brand {
  font-weight: 800; font-size: 18px; letter-spacing: 0.5px;
  color: hsl(var(--fg));
}
.nav-brand span { color: hsl(var(--accent-light)); }
.nav-links {
  display: flex; gap: 6px; flex-wrap: wrap; margin: 0; padding: 0; list-style: none;
}
.nav-links a {
  color: hsl(var(--fg-muted));
  padding: 6px 12px; border-radius: 6px;
  font-size: 14px; font-weight: 500;
}
.nav-links a:hover, .nav-links a.active {
  color: hsl(var(--fg));
  background: hsl(var(--bg-elev-2));
  text-decoration: none;
}
.nav-toggle { display: none; background: none; border: 1px solid hsl(var(--border)); color: hsl(var(--fg)); padding: 6px 10px; border-radius: 6px; cursor: pointer; }

/* ========== Hero ========== */
.hero {
  position: relative;
  padding: 80px 0 64px;
  background: linear-gradient(180deg, hsl(var(--bg-elev)) 0%, hsl(var(--bg)) 100%);
  border-bottom: 1px solid hsl(var(--border));
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(800px circle at 80% 20%, hsl(var(--accent) / 0.15), transparent 60%),
    radial-gradient(600px circle at 10% 80%, hsl(var(--accent) / 0.08), transparent 60%);
  pointer-events: none;
}
.hero-inner { position: relative; }
.hero-eyebrow {
  display: inline-block;
  font-size: 12px; letter-spacing: 1.5px; text-transform: uppercase;
  color: hsl(var(--accent-light));
  background: hsl(var(--accent) / 0.12);
  padding: 4px 10px; border-radius: 4px; margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.05; margin: 0 0 20px; font-weight: 800;
  letter-spacing: -1px;
}
.hero p.lead {
  font-size: 18px; color: hsl(var(--fg-muted));
  max-width: 640px; margin: 0 0 28px;
}
.hero-stats {
  display: flex; gap: 24px; flex-wrap: wrap; margin: 0 0 32px; padding: 0;
}
.hero-stats li {
  list-style: none; font-size: 13px; color: hsl(var(--fg-muted));
}
.hero-stats li strong {
  display: block; font-size: 20px; font-weight: 700;
  color: hsl(var(--fg)); margin-top: 2px;
}
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }

/* ========== Buttons ========== */
.btn {
  display: inline-block;
  padding: 10px 18px; border-radius: 6px;
  font-size: 14px; font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer; text-decoration: none;
  transition: all 0.15s ease;
}
.btn-primary { background: hsl(var(--accent)); color: #fff; }
.btn-primary:hover { background: hsl(var(--accent-light)); text-decoration: none; }
.btn-secondary { background: transparent; color: hsl(var(--fg)); border-color: hsl(var(--border)); }
.btn-secondary:hover { background: hsl(var(--bg-elev-2)); text-decoration: none; }
.btn-tertiary { background: transparent; color: hsl(var(--fg-muted)); }
.btn-tertiary:hover { color: hsl(var(--fg)); text-decoration: none; }

/* ========== Sections ========== */
section { padding: 56px 0; }
section.alt { background: hsl(var(--bg-elev)); border-top: 1px solid hsl(var(--border)); border-bottom: 1px solid hsl(var(--border)); }
section h2 {
  font-size: 28px; font-weight: 700; margin: 0 0 8px; letter-spacing: -0.3px;
}
section .section-eyebrow {
  font-size: 12px; letter-spacing: 1.5px; text-transform: uppercase;
  color: hsl(var(--accent-light)); margin-bottom: 6px;
}
section .section-sub {
  color: hsl(var(--fg-muted)); font-size: 16px; margin: 0 0 32px; max-width: 640px;
}

/* ========== Card Grid ========== */
.card-grid {
  display: grid; gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.card {
  display: block;
  background: hsl(var(--bg-elev));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none;
  color: hsl(var(--fg));
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.card:hover {
  transform: translateY(-2px);
  border-color: hsl(var(--accent));
  text-decoration: none;
}
.card-number {
  display: inline-block; width: 32px; height: 32px; line-height: 32px;
  text-align: center; border-radius: 50%;
  background: hsl(var(--accent) / 0.18);
  color: hsl(var(--accent-light));
  font-weight: 700; margin-bottom: 12px;
}
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { color: hsl(var(--fg-muted)); margin: 0; font-size: 14px; line-height: 1.5; }

/* ========== About Game / Quick Facts ========== */
.about-grid {
  display: grid; gap: 40px;
  grid-template-columns: 1fr 360px;
  align-items: start;
}
.about-text p { color: hsl(var(--fg)); font-size: 16px; line-height: 1.7; }
.facts-table {
  background: hsl(var(--bg-elev));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  padding: 20px;
}
.facts-table dl { margin: 0; display: grid; grid-template-columns: 1fr; gap: 12px; }
.facts-table dt { font-size: 12px; color: hsl(var(--fg-muted)); text-transform: uppercase; letter-spacing: 0.5px; }
.facts-table dd { margin: 2px 0 0; font-weight: 600; color: hsl(var(--fg)); }

/* ========== Two-column layout for inner pages ========== */
.with-sidebar {
  display: grid; gap: 40px;
  grid-template-columns: 220px 1fr;
  align-items: start;
}
.page-aside {
  position: sticky; top: 80px;
  background: hsl(var(--bg-elev));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  padding: 16px;
  font-size: 14px;
}
.page-aside h4 { margin: 0 0 10px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; color: hsl(var(--fg-muted)); }
.page-aside ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.page-aside a { color: hsl(var(--fg-muted)); display: block; padding: 4px 6px; border-radius: 4px; }
.page-aside a:hover, .page-aside a.active { background: hsl(var(--bg-elev-2)); color: hsl(var(--accent-light)); text-decoration: none; }

/* ========== Article styling ========== */
article h1 { font-size: 36px; font-weight: 800; letter-spacing: -0.5px; margin: 0 0 8px; }
article .article-meta { color: hsl(var(--fg-muted)); font-size: 13px; margin-bottom: 32px; }
article h2 { font-size: 24px; margin: 40px 0 12px; padding-top: 12px; border-top: 1px solid hsl(var(--border)); }
article h3 { font-size: 18px; margin: 28px 0 8px; }
article p, article li { font-size: 16px; line-height: 1.7; }
article ul, article ol { padding-left: 22px; }
article blockquote {
  margin: 20px 0; padding: 12px 18px;
  border-left: 3px solid hsl(var(--accent));
  background: hsl(var(--bg-elev));
  border-radius: 0 6px 6px 0;
  color: hsl(var(--fg-muted));
  font-style: italic;
}
article code {
  font-family: var(--font-mono); font-size: 14px;
  background: hsl(var(--bg-elev-2));
  padding: 2px 6px; border-radius: 4px;
}
article table {
  width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px;
}
article th, article td {
  text-align: left; padding: 10px 12px;
  border-bottom: 1px solid hsl(var(--border));
}
article th { background: hsl(var(--bg-elev)); color: hsl(var(--fg)); font-weight: 600; }
article td { color: hsl(var(--fg-muted)); }

/* ========== Wiki list (secrets / collectibles) ========== */
.wiki-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.wiki-item {
  background: hsl(var(--bg-elev));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  padding: 16px 20px;
}
.wiki-item h3 { margin: 0 0 6px; font-size: 16px; color: hsl(var(--accent-light)); }
.wiki-item p { margin: 0; font-size: 14px; color: hsl(var(--fg-muted)); line-height: 1.6; }

/* ========== Final CTA ========== */
.final-cta {
  background: linear-gradient(135deg, hsl(var(--accent) / 0.15), hsl(var(--bg-elev)));
  border-top: 1px solid hsl(var(--border));
  border-bottom: 1px solid hsl(var(--border));
  text-align: center;
}
.final-cta h2 { font-size: 32px; }
.final-cta p { color: hsl(var(--fg-muted)); max-width: 560px; margin: 0 auto 24px; }

/* ========== Footer ========== */
.site-footer {
  background: hsl(var(--bg-elev));
  border-top: 1px solid hsl(var(--border));
  padding: 40px 0 28px;
  font-size: 14px;
  color: hsl(var(--fg-muted));
}
.footer-grid {
  display: grid; gap: 32px;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  margin-bottom: 24px;
}
.site-footer h4 { color: hsl(var(--fg)); font-size: 13px; text-transform: uppercase; letter-spacing: 0.5px; margin: 0 0 10px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.site-footer a { color: hsl(var(--fg-muted)); }
.site-footer a:hover { color: hsl(var(--fg)); }
.footer-bottom { padding-top: 20px; border-top: 1px solid hsl(var(--border)); font-size: 12px; }

/* ========== Responsive ========== */
@media (max-width: 960px) {
  .about-grid, .with-sidebar, .footer-grid { grid-template-columns: 1fr; }
  .page-aside { position: static; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-toggle { display: inline-block; }
  .nav-links.open { display: flex; width: 100%; flex-direction: column; gap: 0; padding-top: 12px; }
  .nav-links.open a { padding: 10px 0; border-top: 1px solid hsl(var(--border)); }
  .hero { padding: 56px 0 40px; }
  .hero-stats { gap: 16px; }
  .hero-stats li { font-size: 12px; }
  .hero-stats li strong { font-size: 16px; }
  section { padding: 40px 0; }
  article h1 { font-size: 28px; }
  section h2 { font-size: 22px; }
}