/* =========================================================
   /assets/site.css — 盛大棋牌安装 · 共享外壳与基础组件
   1 Reset · 2 Tokens · 3 Base · 4 Focus/A11y
   5 Header · 6 Nav · 7 Footer
   8 Buttons · 9 Cards/Tags · 10 Grid/Zones
   11 Breadcrumbs/Prose/Aside · 12 Media
   13 Tabs · 14 Details/QA · 15 Filter · 16 Ledger
   17 Responsive
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 150px; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, dt, hr { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; background: none; border: 0; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; height: 1px; background: var(--c-hairline); }
[hidden] { display: none !important; }

/* ---------- 2. Tokens ---------- */
:root {
  --c-ink: #06231C;
  --c-pitch: #0B3B2E;
  --c-emerald: #14604A;
  --c-signal: #FF7A18;
  --c-amber: #FFB25E;
  --c-cyan: #38E1D6;
  --c-alert: #E23B3B;
  --c-paper: #E8F1ED;
  --c-ink-on-paper: #10231D;
  --c-white: #F2F7F5;
  --c-hairline: rgba(242, 247, 245, .18);
  --c-hairline-strong: rgba(242, 247, 245, .34);
  --c-hairline-dark: rgba(16, 35, 29, .16);

  --f-display: "Barlow Condensed", "Archivo Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --f-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  --f-body: Inter, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --r-sm: 10px;
  --r-md: 20px;
  --r-lg: 28px;
  --r-pill: 999px;

  --rail: 88px;
  --wrap: 1240px;
  --note: 220px;
  --gutter: clamp(16px, 4vw, 40px);

  --t-fast: 180ms cubic-bezier(.2, .7, .3, 1);
  --t-mid: 400ms cubic-bezier(.2, .7, .3, 1);

  --scroll: 0;
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  background: var(--c-ink);
  color: var(--c-white);
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .012em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, h5, h6 {
  font-family: var(--f-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .035em;
  color: var(--c-white);
  text-wrap: balance;
}
h1 { font-size: clamp(34px, 6vw, 72px); letter-spacing: .02em; }
h2 { font-size: clamp(24px, 3.2vw, 38px); }
h3 { font-size: clamp(19px, 2vw, 25px); }
h4 { font-size: 17px; letter-spacing: .06em; }
strong, b { font-weight: 650; }
em { font-style: normal; color: var(--c-amber); }
small { font-size: 13px; letter-spacing: .06em; }
::selection { background: var(--c-signal); color: var(--c-ink); }

.mono {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: .05em;
}
.coord {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  opacity: .9;
}
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.stack > * + * { margin-top: 16px; }
.cluster { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

/* ---------- 4. Focus / A11y ---------- */
:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
  border-radius: 6px;
}
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 300;
  padding: 12px 20px;
  border-radius: 0 0 var(--r-md) 0;
  background: var(--c-signal);
  color: var(--c-ink);
  font-size: 14px;
  font-weight: 650;
  letter-spacing: .06em;
}
.skip-link:focus { left: 0; }

/* ---------- 5. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background-color: var(--c-ink);
  background-image:
    repeating-linear-gradient(135deg, rgba(242, 247, 245, .035) 0 2px, transparent 2px 7px),
    linear-gradient(180deg, #082A22 0%, #06231C 100%);
  border-bottom: 1px solid var(--c-hairline);
  transition: box-shadow var(--t-fast);
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-signal));
  transform: scaleX(var(--scroll, 0));
  transform-origin: 0 50%;
  transition: transform 120ms linear;
  pointer-events: none;
}
.header-inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 18px var(--gutter) 0;
  display: grid;
  gap: 12px;
}
.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 46px;
}
.brand { display: flex; align-items: baseline; gap: .7em; min-width: 0; }
.brand__mark {
  font-family: var(--f-display);
  font-size: clamp(22px, 2.6vw, 31px);
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--c-white);
  white-space: nowrap;
}
.brand__sub {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-cyan);
  white-space: nowrap;
}
.header-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(242, 247, 245, .58);
  white-space: nowrap;
}
.header-meta__sep { width: 1px; height: 12px; background: var(--c-hairline-strong); }
.header-meta .mono { color: var(--c-cyan); }
.header-tools { display: flex; align-items: center; gap: 10px; }
.tool-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-hairline-strong);
  background: rgba(242, 247, 245, .04);
  font-size: 13.5px;
  letter-spacing: .05em;
  color: rgba(242, 247, 245, .85);
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
}
.tool-pill:hover { border-color: var(--c-cyan); color: var(--c-cyan); background: rgba(56, 225, 214, .08); }
.tool-pill__icon { font-size: 15px; color: var(--c-cyan); }
.lang-chip {
  padding: 8px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-hairline);
  font-size: 11px;
  letter-spacing: .14em;
  color: rgba(242, 247, 245, .6);
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-hairline-strong);
  color: var(--c-white);
  font-size: 13px;
  letter-spacing: .08em;
  transition: border-color var(--t-fast), color var(--t-fast);
}
.nav-toggle:hover { border-color: var(--c-signal); color: var(--c-signal); }
.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bars > span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--t-fast), opacity var(--t-fast);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 收缩态 */
.site-header[data-compact] .header-inner { padding-top: 8px; gap: 6px; }
.site-header[data-compact] .header-top { min-height: 38px; }
.site-header[data-compact] .brand__mark { font-size: 20px; }
.site-header[data-compact] .brand__sub,
.site-header[data-compact] .header-meta__year { display: none; }
.site-header[data-compact] .nav-strip { padding-block: 6px; }

/* ---------- 6. Nav ---------- */
.site-nav { border-top: 1px solid var(--c-hairline); }
.nav-strip {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  padding: 10px 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.nav-strip::-webkit-scrollbar { display: none; }
.nav-strip__item { flex: 0 0 auto; }
.nav-strip a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: 14.5px;
  letter-spacing: .04em;
  color: rgba(242, 247, 245, .72);
  white-space: nowrap;
  transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}
.nav-strip a::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-emerald);
  transition: background var(--t-fast), transform var(--t-fast);
}
.nav-strip a:hover { color: var(--c-white); border-color: var(--c-hairline-strong); background: rgba(242, 247, 245, .05); }
.nav-strip a:hover::before { background: var(--c-cyan); }
.nav-strip a[aria-current="page"] {
  background: var(--c-signal);
  border-color: var(--c-signal);
  color: var(--c-ink);
  font-weight: 650;
}
.nav-strip a[aria-current="page"]::before { background: var(--c-ink); transform: scale(1.15); }

/* ---------- 7. Footer ---------- */
.site-footer {
  margin-top: 0;
  background-color: var(--c-ink);
  background-image:
    repeating-linear-gradient(90deg, rgba(242, 247, 245, .04) 0 1px, transparent 1px 64px),
    linear-gradient(180deg, #082A22 0%, #06231C 62%);
  border-top: 2px solid var(--c-signal);
  color: var(--c-white);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.45fr 1fr 1.15fr 1.35fr;
  gap: 40px 32px;
  padding-block: 58px 44px;
}
.footer-brand__mark {
  font-family: var(--f-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: .07em;
}
.footer-brand__sub {
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--c-cyan);
}
.footer-brand__note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 247, 245, .72);
  max-width: 34ch;
}
.footer-col__title {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-amber);
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--c-hairline);
}
.footer-list li + li { margin-top: 9px; }
.footer-list a {
  font-size: 14.5px;
  color: rgba(242, 247, 245, .78);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.footer-list a:hover { color: var(--c-cyan); border-color: var(--c-cyan); }
.footer-col__text {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 247, 245, .72);
}
.footer-col__text .mono { color: var(--c-cyan); }
.footer-data { margin-top: 16px; }
.footer-data__row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--c-hairline);
  font-size: 13px;
}
.footer-data__row dt { color: rgba(242, 247, 245, .58); letter-spacing: .06em; }
.footer-data__row dd { color: var(--c-cyan); }
.footer-contact li {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--c-hairline);
  font-size: 13.5px;
  color: rgba(242, 247, 245, .82);
  overflow-wrap: anywhere;
}
.footer-contact__key {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(242, 247, 245, .55);
  padding-top: 3px;
}
.footer-note {
  margin-top: 16px;
  font-size: 12.5px;
  line-height: 1.8;
  letter-spacing: .03em;
  color: rgba(242, 247, 245, .58);
}
.footer-base { border-top: 1px solid var(--c-hairline); background: rgba(6, 35, 28, .6); }
.footer-base__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding-block: 18px;
}
.footer-base__copy { font-size: 13px; letter-spacing: .06em; color: rgba(242, 247, 245, .6); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-legal a {
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(242, 247, 245, .7);
  transition: color var(--t-fast);
}
.footer-legal a:hover { color: var(--c-cyan); }

/* ---------- 8. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: .05em;
  white-space: nowrap;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}
.btn__code { font-family: var(--f-mono); font-size: 12px; letter-spacing: .08em; opacity: .75; font-weight: 500; }
.btn--signal { background: var(--c-signal); border-color: var(--c-signal); color: var(--c-ink); }
.btn--signal:hover { background: var(--c-amber); border-color: var(--c-amber); }
.btn--ghost { background: transparent; border-color: var(--c-hairline-strong); color: var(--c-white); }
.btn--ghost:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.btn--quiet { background: rgba(242, 247, 245, .07); color: var(--c-white); }
.btn--quiet:hover { background: rgba(242, 247, 245, .14); }

/* ---------- 9. Cards / Tags ---------- */
.card {
  position: relative;
  background: var(--c-pitch);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-md);
  padding: 26px;
}
.card--paper {
  background: var(--c-paper);
  border-color: var(--c-hairline-dark);
  color: var(--c-ink-on-paper);
}
.card--paper h2, .card--paper h3, .card--paper h4 { color: var(--c-ink-on-paper); }
.card--paper .card__coord { color: var(--c-emerald); }
.card__coord {
  display: block;
  margin-bottom: 14px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}
.card--link { transition: border-color var(--t-fast), transform var(--t-fast); }
.card--link:hover { border-color: rgba(56, 225, 214, .5); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 13px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-hairline-strong);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-white);
  white-space: nowrap;
}
.tag--cyan { color: var(--c-cyan); border-color: rgba(56, 225, 214, .42); background: rgba(56, 225, 214, .07); }
.tag--amber { color: var(--c-amber); border-color: rgba(255, 178, 94, .42); background: rgba(255, 178, 94, .09); }
.tag--alert { color: #FFDCDC; border-color: rgba(226, 59, 59, .55); background: rgba(226, 59, 59, .18); }
.tag--signal { color: var(--c-ink); background: var(--c-signal); border-color: var(--c-signal); font-weight: 650; }

/* ---------- 10. Grid / Zones ---------- */
.zone { position: relative; }
.zone--pitch { background: var(--c-pitch); }
.zone--paper { background: var(--c-paper); color: var(--c-ink-on-paper); }
.zone--paper h1, .zone--paper h2, .zone--paper h3, .zone--paper h4 { color: var(--c-ink-on-paper); }
.zone--paper .coord { color: var(--c-emerald); }
.zone--paper .mono { color: var(--c-emerald); }
.zone--paper hr { background: var(--c-hairline-dark); }
.zone--paper .card { background: #FFFFFF; border-color: var(--c-hairline-dark); }
.zone--paper .tag { color: var(--c-ink-on-paper); border-color: var(--c-hairline-dark); }
.zone--paper .tag--cyan { color: var(--c-emerald); border-color: rgba(20, 96, 74, .45); background: rgba(20, 96, 74, .07); }
.zone--paper .tag--alert { color: #8E1F1F; border-color: rgba(226, 59, 59, .5); background: rgba(226, 59, 59, .1); }
.zone--paper .tag--signal { color: var(--c-paper); background: var(--c-ink-on-paper); border-color: var(--c-ink-on-paper); }

.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
@media (min-width: 900px) {
  .span-3 { grid-column: span 3; }
  .span-4 { grid-column: span 4; }
  .span-5 { grid-column: span 5; }
  .span-6 { grid-column: span 6; }
  .span-7 { grid-column: span 7; }
  .span-8 { grid-column: span 8; }
  .span-9 { grid-column: span 9; }
  .span-12 { grid-column: span 12; }
}
@media (max-width: 1023px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 719px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

/* ---------- 11. Split / Axes / Breadcrumbs / Prose / Aside ---------- */
.split {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 44px);
  align-items: start;
}
.axis-rail {
  position: sticky;
  top: 168px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: var(--rail);
  padding: 6px 0 6px 0;
  border-left: 1px solid var(--c-hairline);
}
.axis-rail__item {
  position: relative;
  padding-left: 16px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(242, 247, 245, .45);
  transition: color var(--t-fast);
}
.axis-rail__item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--c-emerald);
  transition: width var(--t-mid), background var(--t-mid);
}
.axis-rail__item[aria-current="true"] { color: var(--c-cyan); }
.axis-rail__item[aria-current="true"]::before { width: 24px; background: var(--c-cyan); }

.with-note {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--note);
  gap: 40px;
  align-items: start;
}
.aside-note {
  font-size: 13px;
  line-height: 1.75;
  letter-spacing: .07em;
  color: rgba(242, 247, 245, .68);
  border-top: 1px solid var(--c-hairline);
  padding-top: 14px;
}
.zone--paper .aside-note { color: rgba(16, 35, 29, .7); border-top-color: var(--c-hairline-dark); }
@media (max-width: 1080px) {
  .with-note { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .aside-note { max-width: 60ch; }
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-block: 16px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(242, 247, 245, .52);
}
.breadcrumbs li { display: flex; align-items: center; gap: 10px; }
.breadcrumbs li + li::before { content: "/"; color: var(--c-emerald); }
.breadcrumbs a:hover { color: var(--c-cyan); }
.breadcrumbs [aria-current="page"] { color: var(--c-cyan); }
.zone--paper .breadcrumbs { color: rgba(16, 35, 29, .55); }
.zone--paper .breadcrumbs a:hover,
.zone--paper .breadcrumbs [aria-current="page"] { color: var(--c-emerald); }

.prose { font-size: 17px; line-height: 1.78; }
.prose p { max-width: 74ch; }
.prose p + p { margin-top: 16px; }
.prose h2 { margin-top: 44px; margin-bottom: 14px; }
.prose h3 { margin-top: 32px; margin-bottom: 10px; }
.prose ul, .prose ol { margin: 16px 0; max-width: 74ch; }
.prose ul li, .prose ol li { position: relative; padding-left: 22px; margin-top: 8px; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .72em;
  width: 8px;
  height: 1px;
  background: var(--c-signal);
}
.prose ol { counter-reset: prose-ol; }
.prose ol li { counter-increment: prose-ol; padding-left: 30px; }
.prose ol li::before {
  content: counter(prose-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--c-cyan);
}
.zone--paper .prose ol li::before { color: var(--c-emerald); }
.prose a { color: var(--c-cyan); border-bottom: 1px solid rgba(56, 225, 214, .4); }
.prose a:hover { border-bottom-color: var(--c-cyan); }
.zone--paper .prose a { color: var(--c-emerald); border-bottom-color: rgba(20, 96, 74, .4); }
.prose blockquote {
  margin: 24px 0;
  padding: 18px 22px;
  border-left: 3px solid var(--c-signal);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(255, 122, 24, .08);
  font-size: 16px;
}

/* ---------- 12. Media ---------- */
.media {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border-radius: var(--r-md);
  border: 1px solid var(--c-hairline);
  background: linear-gradient(150deg, #14604A 0%, #0B3B2E 48%, #06231C 100%);
  aspect-ratio: 16 / 9;
}
.media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(242, 247, 245, .085) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, rgba(242, 247, 245, .085) 0 1px, transparent 1px 56px);
  opacity: .85;
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    radial-gradient(120% 90% at 14% 8%, rgba(56, 225, 214, .26), transparent 56%),
    linear-gradient(200deg, rgba(255, 122, 24, .18), transparent 62%);
}
.media img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.72) contrast(1.05) brightness(.86); }
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media__caption {
  position: absolute;
  left: 18px;
  bottom: 16px;
  z-index: 3;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-white);
  text-shadow: 0 1px 10px rgba(6, 35, 28, .95);
}

/* ---------- 13. Tabs ---------- */
.tablist {
  display: flex;
  gap: 6px;
  padding: 5px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-hairline);
  background: rgba(242, 247, 245, .06);
  overflow-x: auto;
  scrollbar-width: none;
}
.tablist::-webkit-scrollbar { display: none; }
.tab {
  flex: 0 0 auto;
  padding: 9px 19px;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .04em;
  color: rgba(242, 247, 245, .7);
  white-space: nowrap;
  transition: background var(--t-fast), color var(--t-fast);
}
.tab:hover { color: var(--c-white); }
.tab[aria-selected="true"] { background: var(--c-signal); color: var(--c-ink); }
.tabpanel { padding-top: 26px; }
.tabpanel:focus { outline: none; }
.zone--paper .tablist { background: rgba(16, 35, 29, .06); border-color: var(--c-hairline-dark); }
.zone--paper .tab { color: rgba(16, 35, 29, .7); }
.zone--paper .tab:hover { color: var(--c-ink-on-paper); }
.zone--paper .tab[aria-selected="true"] { background: var(--c-ink-on-paper); color: var(--c-paper); }

/* ---------- 14. Details / QA ---------- */
.qa {
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-md);
  background: rgba(242, 247, 245, .03);
  overflow: hidden;
  transition: border-color var(--t-fast), background var(--t-fast);
}
.qa + .qa { margin-top: 10px; }
.qa[open] { background: rgba(242, 247, 245, .065); border-color: rgba(56, 225, 214, .38); }
.qa__summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 24px;
  cursor: pointer;
  list-style: none;
  font-family: var(--f-display);
  font-size: 18px;
  font-weight: 650;
  letter-spacing: .035em;
  color: var(--c-white);
}
.qa__summary::-webkit-details-marker { display: none; }
.qa__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 20px;
  line-height: 1.2;
  color: var(--c-cyan);
}
.qa[open] .qa__summary::after { content: "\2013"; }
.qa__body {
  padding: 0 24px 20px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(242, 247, 245, .78);
}
.qa__body p { max-width: 70ch; }
.zone--paper .qa { background: rgba(16, 35, 29, .03); border-color: var(--c-hairline-dark); }
.zone--paper .qa[open] { background: #FFFFFF; border-color: rgba(20, 96, 74, .4); }
.zone--paper .qa__summary { color: var(--c-ink-on-paper); }
.zone--paper .qa__summary::after { color: var(--c-emerald); }
.zone--paper .qa__body { color: rgba(16, 35, 29, .78); }

/* ---------- 15. Filter ---------- */
.filter-field {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 420px;
  padding: 8px 10px 8px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-hairline-strong);
  background: rgba(242, 247, 245, .05);
  transition: border-color var(--t-fast);
}
.filter-field:focus-within { border-color: var(--c-cyan); }
.filter-field__label {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-cyan);
  white-space: nowrap;
}
.filter-field__input {
  flex: 1;
  min-width: 0;
  padding: 7px 0;
  font-size: 15px;
  color: var(--c-white);
}
.filter-field__input::placeholder { color: rgba(242, 247, 245, .42); }
.filter-field__input:focus { outline: none; }
.zone--paper .filter-field { background: #FFFFFF; border-color: var(--c-hairline-dark); }
.zone--paper .filter-field__label { color: var(--c-emerald); }
.zone--paper .filter-field__input { color: var(--c-ink-on-paper); }
.zone--paper .filter-field__input::placeholder { color: rgba(16, 35, 29, .45); }

/* ---------- 16. Ledger ---------- */
.ledger { display: grid; gap: 10px; }
.ledger__row {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 16px 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--c-hairline);
  background: var(--c-pitch);
  transition: border-color var(--t-fast), background var(--t-fast);
}
.ledger__row:hover { border-color: rgba(56, 225, 214, .45); }
.ledger__code {
  padding: 4px 12px;
  border-radius: var(--r-pill);
  border: 1px dashed rgba(56, 225, 214, .5);
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--c-cyan);
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast);
}
.ledger__code[data-copied] { border-style: solid; border-color: var(--c-cyan); background: rgba(56, 225, 214, .16); }
.ledger__time { font-family: var(--f-mono); font-size: 13px; color: rgba(242, 247, 245, .6); }
.ledger__title { font-size: 16px; color: var(--c-white); }
.ledger__meta { font-family: var(--f-mono); font-size: 12px; letter-spacing: .06em; color: var(--c-amber); }
.ledger__row[hidden] { display: none; }
@media (max-width: 719px) {
  .ledger__row { grid-template-columns: auto minmax(0, 1fr); row-gap: 8px; }
  .ledger__meta { grid-column: 1 / -1; }
}

/* ---------- 17. Motion / Responsive ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html { scroll-behavior: auto; }
  .site-header::after { transition: none; }
}

@media (max-width: 1100px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 36px 28px; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    padding: 6px var(--gutter) 20px;
    background-color: var(--c-pitch);
    background-image: linear-gradient(180deg, #0B3B2E 0%, #08281F 100%);
    border-bottom: 1px solid var(--c-hairline);
    box-shadow: 0 24px 48px rgba(6, 35, 28, .6);
  }
  .site-nav[data-open] { display: block; animation: navIn 180ms cubic-bezier(.2, .7, .3, 1); }
  .nav-strip { flex-direction: column; align-items: stretch; gap: 4px; padding: 12px 0 0; overflow: visible; }
  .nav-strip__item { width: 100%; }
  .nav-strip a { width: 100%; padding: 13px 16px; border-radius: 14px; font-size: 15.5px; }
  .split { grid-template-columns: minmax(0, 1fr); }
  .axis-rail { display: none; }
}
@keyframes navIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .header-inner { padding-top: 14px; }
  .brand__sub { display: none; }
  .header-meta { font-size: 10px; gap: 8px; }
  .tool-pill__label { display: none; }
  .tool-pill { padding: 9px 13px; }
  .lang-chip { display: none; }
  .footer-inner { grid-template-columns: 1fr; padding-block: 40px 32px; }
  .footer-base__inner { flex-direction: column; align-items: flex-start; gap: 12px; }
  .footer-contact li { grid-template-columns: 1fr; gap: 4px; }
}