/* Navigat — 暗色开发控制台 / game-dev field notes 风
   独立视觉身份:冷调石板底 + 霓虹绿/电蓝 强调 + 等宽标题 + 卡片栅格 (区别于任何其它站) */
:root {
  --bg: #0d1320;
  --bg2: #101a2c;
  --panel: #16223a;
  --panel2: #1b2a46;
  --ink: #e3ebf8;
  --soft: #93a3bd;
  --faint: #5f7091;
  --line: #24334f;
  --neon: #57e08a;
  --blue: #4aa8ff;
  --violet: #b98cff;
  --amber: #ffcf5c;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, "SFMono-Regular", ui-monospace, monospace;
  --sans: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans);
  line-height: 1.72; font-size: 17px;
  background-image:
    radial-gradient(1200px 500px at 80% -10%, rgba(74,168,255,.10), transparent 60%),
    radial-gradient(900px 420px at 10% 0%, rgba(87,224,138,.07), transparent 55%);
  background-attachment: fixed;
}
a { color: var(--neon); text-decoration: none; }
a:hover { color: #8ff0b2; }
h1, h2, h3 { font-family: var(--mono); font-weight: 700; letter-spacing: -.02em; line-height: 1.2; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 22px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--neon); color: #06121f; padding: 8px 14px; border-radius: 6px; z-index: 9; }

/* top bar */
.topbar { position: sticky; top: 0; z-index: 5; background: rgba(13,19,32,.86); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; gap: 22px; height: 62px; }
.brand { display: flex; align-items: baseline; gap: 10px; color: var(--ink); font-family: var(--mono); }
.brand-glyph { width: 15px; height: 15px; border-radius: 3px; background: linear-gradient(135deg, var(--neon), var(--blue)); box-shadow: 0 0 14px rgba(87,224,138,.6); align-self: center; }
.brand-word { font-weight: 800; font-size: 20px; letter-spacing: .02em; }
.brand-tag { font-size: 11px; color: var(--faint); letter-spacing: .14em; text-transform: uppercase; }
.nav { margin-left: auto; display: flex; gap: 6px; flex-wrap: wrap; }
.nav a { font-family: var(--mono); font-size: 12.5px; color: var(--soft); padding: 7px 11px; border-radius: 7px; border: 1px solid transparent; }
.nav a:hover { color: var(--ink); background: var(--panel); border-color: var(--line); }
.nav a.on { color: var(--neon); border-color: rgba(87,224,138,.45); background: rgba(87,224,138,.08); }

/* hero */
.hero { padding: 62px 0 30px; border-bottom: 1px solid var(--line); }
.kicker { font-family: var(--mono); color: var(--blue); font-size: 13px; letter-spacing: .08em; margin: 0 0 10px; }
.hero h1 { font-size: clamp(30px, 5vw, 48px); margin: 0 0 14px; }
.lede { color: var(--soft); font-size: 18.5px; max-width: 640px; margin: 0 0 26px; }
.hero-stats { display: flex; gap: 34px; flex-wrap: wrap; font-family: var(--mono); }
.hero-stats b { display: block; font-size: 30px; color: var(--neon); }
.hero-stats span { font-size: 12px; color: var(--faint); letter-spacing: .06em; text-transform: uppercase; }

/* decks & cards */
.deck { padding: 44px 22px; }
.deck-head { margin-bottom: 22px; }
.deck-head h2 { font-size: 24px; margin: 0 0 4px; }
.deck-head p { color: var(--soft); margin: 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(288px, 1fr)); gap: 18px; }
.cards.tight { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.card { display: block; background: linear-gradient(180deg, var(--panel), var(--bg2)); border: 1px solid var(--line); border-radius: 13px; padding: 20px 20px 18px; transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease; }
.card:hover { transform: translateY(-3px); border-color: rgba(87,224,138,.5); box-shadow: 0 14px 36px rgba(0,0,0,.42); }
.card h3 { font-size: 18px; margin: 12px 0 8px; color: var(--ink); }
.card p { color: var(--soft); font-size: 14.5px; margin: 0 0 14px; }
.card-more { font-family: var(--mono); font-size: 12.5px; color: var(--blue); }
.card-top { display: flex; gap: 8px; flex-wrap: wrap; }
.chip { font-family: var(--mono); font-size: 11px; letter-spacing: .04em; text-transform: uppercase; padding: 4px 9px; border-radius: 20px; border: 1px solid var(--line); color: var(--soft); }
.chip.lvl { color: var(--amber); border-color: rgba(255,207,92,.4); background: rgba(255,207,92,.07); }
.chip.area { color: var(--violet); border-color: rgba(185,140,255,.4); background: rgba(185,140,255,.07); }

/* chapters */
.chapter { padding: 34px 22px; border-top: 1px solid var(--line); }
.chapter-head h2 { display: flex; align-items: baseline; gap: 12px; font-size: 22px; margin: 0 0 6px; }
.chapter-head .num { font-size: 14px; color: var(--neon); }
.chapter-head p { color: var(--soft); margin: 0 0 10px; max-width: 700px; }
.chapter-link { font-family: var(--mono); font-size: 13px; }
.mini { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 14px 0 0; }
.mini a { font-size: 13.5px; color: var(--ink); background: var(--panel); border: 1px solid var(--line); padding: 6px 12px; border-radius: 8px; display: inline-block; }
.mini a:hover { border-color: var(--neon); color: var(--neon); }

/* chapter page */
.chapter-hero { padding: 52px 22px 26px; border-bottom: 1px solid var(--line); }
.chapter-hero h1 { font-size: clamp(28px, 4.4vw, 40px); margin: 0 0 12px; }
.chapter-count { font-family: var(--mono); font-size: 12.5px; color: var(--faint); letter-spacing: .05em; text-transform: uppercase; margin: 18px 0 0; }

/* article */
.article { padding: 34px 22px 60px; }
.crumbs { font-family: var(--mono); font-size: 12.5px; color: var(--faint); display: flex; gap: 8px; margin-bottom: 22px; }
.crumbs a { color: var(--soft); }
.art-head { border-bottom: 1px solid var(--line); padding-bottom: 26px; margin-bottom: 30px; }
.badges { display: flex; gap: 8px; margin-bottom: 14px; }
.art-head h1 { font-size: clamp(27px, 4.4vw, 40px); margin: 0 0 8px; }
.art-sub { color: var(--soft); font-family: var(--mono); font-size: 14px; margin: 0 0 12px; }
.art-date { color: var(--faint); font-size: 12.5px; font-family: var(--mono); margin: 0; }

.art-layout { display: grid; grid-template-columns: 268px 1fr; gap: 40px; align-items: start; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 13px; padding: 20px; position: sticky; top: 82px; }
.panel-title { font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--blue); margin: 0 0 14px; }
.facts { margin: 0; }
.facts dt { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); margin-top: 13px; }
.facts dt:first-child { margin-top: 0; }
.facts dd { margin: 2px 0 0; color: var(--ink); font-size: 15px; }

.prose { min-width: 0; }
.sec { margin-bottom: 34px; }
.sec h2 { display: flex; gap: 12px; align-items: baseline; font-size: 20px; margin: 0 0 12px; color: var(--ink); }
.sec-i { font-size: 12px; color: var(--neon); background: rgba(87,224,138,.09); border: 1px solid rgba(87,224,138,.3); border-radius: 6px; padding: 2px 7px; }
.prose p { color: #cfd9ec; margin: 0 0 15px; }
.related { border-top: 1px solid var(--line); padding-top: 26px; }
.related .card h3 { margin: 0 0 8px; font-size: 16px; }

/* legal */
.legal { padding: 46px 22px 60px; max-width: 820px; }
.legal h1 { font-size: clamp(26px, 4vw, 36px); margin: 16px 0 22px; }
.legal .prose p { color: var(--soft); }

/* footer */
.foot { border-top: 1px solid var(--line); margin-top: 40px; padding: 34px 0 26px; background: var(--bg2); }
.foot-grid { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.foot-brand { font-family: var(--mono); font-weight: 800; font-size: 18px; margin: 0 0 6px; color: var(--ink); }
.foot-tag { color: var(--soft); font-size: 14px; margin: 0; max-width: 420px; }
.foot nav { display: flex; gap: 16px; flex-wrap: wrap; }
.foot nav a { color: var(--soft); font-size: 14px; }
.foot nav a:hover { color: var(--neon); }
.foot-note { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--faint); font-size: 12.5px; font-family: var(--mono); }

@media (max-width: 820px) {
  .art-layout { grid-template-columns: 1fr; }
  .panel { position: static; }
  .brand-tag { display: none; }
  .nav { gap: 2px; }
}