/* =========================================================
   澳门沙金服务 — 共享样式 /assets/site.css
   夜间控制台 × 翻旧技术手册
   ========================================================= */

/* 1. Reset ------------------------------------------------ */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body,
h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }

ul, ol { padding: 0; list-style: none; }

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

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

table { border-collapse: collapse; width: 100%; }

summary { cursor: pointer; }

/* 2. Tokens ---------------------------------------------- */
:root {
  --ink-900: #0B1220;
  --ink-800: #121C2E;
  --ink-700: #1B2940;
  --paper-100: #F4EDE0;
  --paper-200: #E6DCC8;
  --paper-ink: #141A26;
  --gold-400: #D7A445;
  --gold-200: #F1D08A;
  --celadon-400: #4CA98C;
  --celadon-700: #2C6E5A;
  --clay-500: #C0653F;
  --slate-400: #8996AC;
  --line-600: #33507A;

  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", sans-serif;
  --font-body: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, monospace;

  --shell: 1280px;
  --rail: 288px;
  --gutter: 24px;
  --gutter-lg: 40px;

  --line-soft: rgba(51, 80, 122, 0.55);
  --line-hard: rgba(11, 18, 32, 0.92);

  --header-h: 132px;
  --dur: 180ms;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* 3. Base typography ------------------------------------- */
body {
  min-height: 100vh;
  background-color: var(--ink-900);
  color: var(--paper-100);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.026) 0 1px,
    transparent 1px 3px
  );
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

h1 { font-size: clamp(40px, 6vw, 88px); }
h2 { font-size: clamp(26px, 3.2vw, 44px); }
h3 { font-size: clamp(20px, 2vw, 28px); font-weight: 600; }
h4 { font-size: 20px; font-weight: 600; }

p { text-wrap: pretty; }

.mono,
code, kbd, samp {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.site-header .mono,
.site-footer .mono,
.ink-panel .mono,
.on-dark .mono { color: var(--gold-400); }

::selection { background: rgba(215, 164, 69, 0.32); color: var(--paper-100); }

/* 4. Focus ----------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--celadon-400);
  outline-offset: 2px;
}

.site-header :focus-visible,
.site-footer :focus-visible,
.ink-panel :focus-visible {
  outline-color: var(--gold-200);
}

/* 5. Layout primitives ----------------------------------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 40px);
}

.folio-grid {
  display: grid;
  grid-template-columns: minmax(240px, var(--rail)) minmax(0, 1fr);
  gap: clamp(24px, 3vw, var(--gutter-lg));
  align-items: start;
}

.folio-rail {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

.folio-main {
  min-width: 0;
  padding-block: clamp(20px, 3vw, 36px) 0;
}

/* 6. Skip link ------------------------------------------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--gold-400);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: 12px; }

/* 7. Header ---------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--ink-800);
  border-bottom: 1px solid var(--line-600);
  box-shadow: 0 1px 0 rgba(215, 164, 69, 0.14), 0 22px 44px -36px rgba(0, 0, 0, 0.95);
}

.header-upper {
  max-height: 104px;
  overflow: hidden;
  opacity: 1;
  background: linear-gradient(180deg, #16223A 0%, var(--ink-800) 100%);
  border-bottom: 1px solid var(--line-soft);
  transition: max-height var(--dur) var(--ease),
              opacity var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.site-header[data-stuck="true"] .header-upper {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.header-upper__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
  padding-block: 12px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand__mark {
  font-family: var(--font-display);
  font-size: 25px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper-100);
  transition: color var(--dur) var(--ease);
}

.brand__subline {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--slate-400);
}

.brand:hover .brand__mark { color: var(--gold-200); }

.header-rail {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.version-switch {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  background: rgba(11, 18, 32, 0.62);
  border: 1px solid var(--line-600);
}

.version-switch__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate-400);
  padding-inline: 10px;
  text-transform: uppercase;
  white-space: nowrap;
}

.version-switch__btn {
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--slate-400);
  border: 1px solid transparent;
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.version-switch__btn .mono { color: inherit; }

.version-switch__btn:hover {
  color: var(--gold-200);
  border-color: rgba(241, 208, 138, 0.45);
}

.version-switch__btn[aria-pressed="true"] {
  color: var(--gold-400);
  background: rgba(215, 164, 69, 0.12);
  border-color: var(--gold-400);
}

.ghost-link {
  display: inline-block;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--paper-200);
  border: 1px solid var(--line-600);
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.ghost-link:hover {
  color: var(--gold-200);
  border-color: var(--gold-200);
  background: rgba(215, 164, 69, 0.08);
}

.header-lower { background: var(--ink-800); }

.header-lower__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 56px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--paper-200);
  border: 1px solid var(--line-600);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover { color: var(--gold-200); border-color: var(--gold-200); }

.nav-toggle__bars {
  position: relative;
  width: 18px;
  height: 2px;
  background: currentColor;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.primary-nav { flex: 1 1 auto; min-width: 0; }

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
}

.nav-list__item { display: flex; }

.nav-link {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--paper-200);
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.nav-link:hover {
  color: var(--gold-200);
  background: rgba(241, 208, 138, 0.06);
  border-bottom-color: rgba(241, 208, 138, 0.5);
}

.nav-link[aria-current="page"] {
  color: var(--gold-400);
  border-bottom-color: var(--gold-400);
}

.header-lower__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-left: 16px;
  border-left: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate-400);
  white-space: nowrap;
}

.header-lower__status-text { color: var(--slate-400); }

.status-dot {
  width: 8px;
  height: 8px;
  display: inline-block;
  background: var(--slate-400);
  flex: none;
}

.status-dot--ok {
  background: var(--celadon-400);
  box-shadow: 0 0 0 3px rgba(76, 169, 140, 0.18);
}

.status-dot--warn {
  background: var(--clay-500);
  box-shadow: 0 0 0 3px rgba(192, 101, 63, 0.18);
}

.status-dot--gold {
  background: var(--gold-400);
  box-shadow: 0 0 0 3px rgba(215, 164, 69, 0.18);
}

/* 8. Footer ---------------------------------------------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(48px, 7vw, 96px);
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 72%);
  border-top: 1px solid var(--line-600);
}

.footer-waves {
  height: 66px;
  opacity: 0.72;
  background-image:
    repeating-radial-gradient(circle at 50% 132%, transparent 0 24px, rgba(51, 80, 122, 0.5) 24px 25px),
    repeating-radial-gradient(circle at 50% 132%, transparent 0 42px, rgba(76, 169, 140, 0.22) 42px 43px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 94%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 94%);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(0, 2fr);
  gap: var(--gutter-lg);
  padding-block: clamp(26px, 4vw, 44px) 26px;
  border-bottom: 1px solid var(--line-soft);
}

.footer-brand__mark {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper-100);
}

.footer-brand__subline {
  margin-top: 6px;
  font-size: 13px;
  color: var(--slate-400);
}

.footer-brand__meta {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate-400);
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px 20px;
}

.footer-col { min-width: 0; }

.footer-col__title {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-400);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.footer-link {
  display: inline-block;
  font-size: 14px;
  color: var(--paper-200);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.footer-link:hover {
  color: var(--gold-200);
  padding-left: 6px;
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px 24px;
  padding-block: 22px;
  border-bottom: 1px solid var(--line-soft);
}

.footer-contact__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate-400);
  text-transform: uppercase;
}

.footer-contact__value {
  font-size: 14px;
  color: var(--paper-100);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  padding-block: 18px;
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate-400);
}

.footer-copy {
  font-size: 13px;
  color: var(--slate-400);
}

.to-top {
  margin-left: auto;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-400);
  border: 1px solid var(--line-soft);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.to-top:hover { color: var(--gold-200); border-color: var(--gold-200); }

.footer-note {
  max-width: 82ch;
  padding: 10px 14px;
  padding-bottom: 30px;
  border-left: 3px solid var(--gold-400);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate-400);
}

/* 9. Buttons --------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--paper-100);
  border: 1px solid var(--line-600);
  background: transparent;
  transition: transform var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.btn:hover { transform: translateY(-2px); }

.btn__arrow { font-family: var(--font-mono); color: inherit; }

.btn--solid {
  background: var(--celadon-700);
  border-color: var(--celadon-700);
  color: var(--paper-100);
}

.btn--solid:hover {
  background: #347F68;
  border-color: var(--celadon-400);
  box-shadow: 0 10px 22px -16px rgba(76, 169, 140, 0.9);
}

.btn--gold { border-color: var(--gold-400); color: var(--gold-400); }

.btn--gold:hover {
  color: var(--gold-200);
  border-color: var(--gold-200);
  background: rgba(215, 164, 69, 0.12);
}

.btn--outline { color: var(--paper-200); }

.btn--outline:hover {
  color: var(--gold-200);
  border-color: var(--gold-200);
}

.btn--quiet {
  padding-inline: 8px;
  border-color: transparent;
  color: var(--slate-400);
}

.btn--quiet:hover { color: var(--gold-200); }

/* 10. Breadcrumbs ---------------------------------------- */
.breadcrumbs { padding-block: 16px 0; }

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate-400);
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
}

.breadcrumbs__item::after {
  content: "/";
  margin-left: 8px;
  color: var(--line-600);
}

.breadcrumbs__item:last-child::after { content: ""; }

.breadcrumbs__link { color: var(--slate-400); }

.breadcrumbs__link:hover { color: var(--gold-200); }

.breadcrumbs__current { color: var(--paper-200); }

/* 11. Text helpers --------------------------------------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-400);
}

.lede {
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--paper-200);
}

.prose { max-width: 70ch; }

.prose p { margin-bottom: 1.1em; }

.prose p:last-child { margin-bottom: 0; }

.prose strong { color: var(--gold-200); font-weight: 600; }

.paper-card .prose strong { color: var(--clay-500); }

/* 12. Section titles ------------------------------------- */
.section-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-600);
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 500;
  color: var(--paper-100);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold-400);
}

/* 13. Cards & surfaces ----------------------------------- */
.paper-card {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  background: var(--paper-100);
  color: var(--paper-ink);
  border: 1px solid var(--line-hard);
  box-shadow: 4px 4px 0 rgba(230, 220, 200, 0.10), 8px 8px 0 rgba(51, 80, 122, 0.28);
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.paper-card:hover {
  transform: translateY(-2px);
  border-color: var(--gold-400);
  box-shadow: 4px 6px 0 rgba(230, 220, 200, 0.16), 8px 10px 0 rgba(51, 80, 122, 0.36);
}

.paper-card--flush { padding: 0; }

.paper-card .section-title {
  color: var(--paper-ink);
  border-bottom-color: rgba(20, 26, 38, 0.25);
}

.paper-card .eyebrow { color: var(--clay-500); }

.paper-card .mono { color: var(--paper-ink); }

.paper-card a { color: var(--celadon-700); border-bottom: 1px solid rgba(44, 110, 90, 0.4); }

.paper-card a:hover { color: var(--paper-ink); border-bottom-color: var(--gold-400); }

.paper-card .lede { color: #2C3648; }

.ink-panel {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  background: var(--ink-700);
  border: 1px solid var(--line-600);
}

.ink-panel--band {
  background: var(--ink-800);
  border-left: 3px solid var(--gold-400);
}

.corner-fold::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 38px;
  height: 38px;
  background: linear-gradient(225deg, var(--ink-800) 0 46%, var(--paper-200) 46% 100%);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  pointer-events: none;
}

/* 14. Bento ---------------------------------------------- */
.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.bento__cell {
  grid-column: span 3;
  min-height: 168px;
  padding: 20px;
  background: var(--ink-700);
  border: 1px solid var(--line-600);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.bento__cell:hover { transform: translateY(-2px); border-color: var(--gold-400); }

.bento__cell--2x1 { grid-column: span 6; }

.bento__cell--3x1 { grid-column: span 9; }

.bento__cell--2x2 {
  grid-column: span 6;
  grid-row: span 2;
  min-height: 348px;
}

.bento__cell--paper {
  background: var(--paper-100);
  color: var(--paper-ink);
  border-color: var(--line-hard);
}

/* 15. Media frame ---------------------------------------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--line-600);
  background-color: var(--ink-700);
  background-image:
    linear-gradient(180deg, rgba(11, 18, 32, 0.92), rgba(11, 18, 32, 0.72)),
    repeating-linear-gradient(90deg, rgba(51, 80, 122, 0.32) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(180deg, rgba(51, 80, 122, 0.32) 0 1px, transparent 1px 28px);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.72;
  filter: saturate(0.85) contrast(1.05) brightness(0.9);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.03) 0 1px,
    transparent 1px 3px
  );
}

.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper-200);
  background: linear-gradient(180deg, rgba(11, 18, 32, 0), rgba(11, 18, 32, 0.92));
}

/* 16. Chips, notices, annotations ------------------------ */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper-200);
  background: rgba(11, 18, 32, 0.4);
  border: 1px solid var(--line-600);
}

.chip--gold { color: var(--gold-400); border-color: rgba(215, 164, 69, 0.6); }

.chip--celadon { color: var(--celadon-400); border-color: rgba(76, 169, 140, 0.6); }

.chip--clay { color: var(--clay-500); border-color: rgba(192, 101, 63, 0.65); }

.notice {
  padding: 14px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-200);
  background: rgba(215, 164, 69, 0.07);
  border-left: 3px solid var(--gold-400);
}

.notice--clay { background: rgba(192, 101, 63, 0.09); border-left-color: var(--clay-500); }

.notice--celadon { background: rgba(76, 169, 140, 0.09); border-left-color: var(--celadon-400); }

.annotation {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate-400);
  background: rgba(27, 41, 64, 0.55);
  border-left: 3px solid var(--gold-400);
}

/* 17. Tables & version columns --------------------------- */
.data-table {
  width: 100%;
  font-size: 14px;
  background: rgba(11, 18, 32, 0.5);
  border: 1px solid var(--line-600);
}

.data-table caption {
  caption-side: top;
  padding-bottom: 10px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate-400);
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(51, 80, 122, 0.45);
}

.data-table thead th {
  background: var(--ink-700);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--slate-400);
  white-space: nowrap;
}

.data-table tbody tr:nth-child(even) { background: rgba(18, 28, 46, 0.55); }

.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td { border-bottom: 0; }

[data-version-column] {
  transition: background-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

[data-version-column].is-version-active {
  color: var(--gold-200);
  background: rgba(215, 164, 69, 0.10);
  box-shadow: inset 3px 0 0 var(--gold-400);
}

[data-version-panel] { display: none; }

[data-version-panel].is-version-active { display: block; }

.paper-card .data-table {
  background: transparent;
  border-color: rgba(20, 26, 38, 0.35);
}

.paper-card .data-table thead th {
  background: var(--paper-200);
  color: #3A4356;
}

.paper-card .data-table th,
.paper-card .data-table td { border-bottom-color: rgba(20, 26, 38, 0.18); }

.paper-card .data-table tbody tr:nth-child(even) { background: rgba(230, 220, 200, 0.6); }

.paper-card [data-version-column].is-version-active {
  color: var(--paper-ink);
  background: rgba(215, 164, 69, 0.28);
}

/* 18. Timeline ------------------------------------------- */
.timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(220px, 1fr);
  margin-block: 24px;
  overflow-x: auto;
  border-top: 1px solid var(--line-600);
}

.timeline__step {
  position: relative;
  padding: 24px 20px 24px;
  border-right: 1px solid rgba(51, 80, 122, 0.45);
  transition: background-color var(--dur) var(--ease);
}

.timeline__step:hover { background: rgba(27, 41, 64, 0.55); }

.timeline__step::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 20px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 1px solid var(--gold-400);
}

.timeline__step--current::before { background: var(--gold-400); }

.timeline__step--legacy::before { border-color: var(--clay-500); }

.timeline__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate-400);
    text-transform: uppercase;
}

.timeline__value {
  margin-top: 6px;
  font-family: var(--font-display);
  font-size: 26px;
  color: var(--paper-100);
}

/* 19. Copy & code path ----------------------------------- */
.code-path {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--gold-200);
  background: rgba(11, 18, 32, 0.75);
  border: 1px solid var(--line-600);
  word-break: break-all;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate-400);
  border: 1px dashed var(--line-600);
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.copy-btn:hover { color: var(--gold-200); border-color: var(--gold-200); }

.copy-btn[data-copied="true"] {
  color: var(--celadon-400);
  border-style: solid;
  border-color: var(--celadon-400);
  background: rgba(76, 169, 140, 0.10);
}

/* 20. Disclosure ----------------------------------------- */
.disclosure {
  background: rgba(18, 28, 46, 0.5);
  border: 1px solid var(--line-600);
}

.disclosure + .disclosure { margin-top: 10px; }

.disclosure > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  list-style: none;
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--paper-100);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.disclosure > summary::-webkit-details-marker { display: none; }

.disclosure > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--gold-400);
}

.disclosure[open] > summary::after { content: "–"; }

.disclosure > summary:hover {
  color: var(--gold-200);
  background: rgba(215, 164, 69, 0.07);
}

.disclosure__body {
  padding: 16px 18px 20px;
  border-top: 1px solid rgba(51, 80, 122, 0.45);
  font-size: 15px;
  color: var(--paper-200);
}

/* 21. TOC ------------------------------------------------ */
.toc {
  padding: 16px;
  background: rgba(18, 28, 46, 0.65);
  border: 1px solid var(--line-600);
}

.toc__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate-400);
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc-link {
  display: block;
  padding: 7px 10px 7px 12px;
  font-size: 14px;
  color: var(--slate-400);
  border-left: 2px solid transparent;
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.toc-link:hover {
  color: var(--paper-100);
  background: rgba(51, 80, 122, 0.28);
}

.toc-link[aria-current="true"] {
  color: var(--gold-400);
  border-left-color: var(--gold-400);
  background: rgba(215, 164, 69, 0.08);
}

/* 22. Decorative bands ----------------------------------- */
.strata-band {
  height: clamp(40px, 6vw, 72px);
  opacity: 0.85;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background-image: repeating-linear-gradient(
    180deg,
    rgba(192, 101, 63, 0.24) 0 6px,
    rgba(192, 101, 63, 0.10) 6px 14px,
    rgba(215, 164, 69, 0.14) 14px 17px,
    rgba(51, 80, 122, 0.18) 17px 30px
  );
}

.wave-rule {
  height: 18px;
  background-image: repeating-linear-gradient(
    90deg,
    transparent 0 8px,
    rgba(76, 169, 140, 0.35) 8px 9px
  );
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}

/* 23. Reveal --------------------------------------------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(6px);
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  transition: opacity 120ms var(--ease), transform 120ms var(--ease);
}

/* 24. Responsive ----------------------------------------- */
@media (max-width: 1023px) {
  :root { --header-h: 108px; }

  .folio-grid { grid-template-columns: minmax(0, 1fr); }

  .folio-rail { position: static; }

  .nav-toggle { display: inline-flex; }

  .header-lower__inner {
    position: relative;
    flex-wrap: wrap;
    padding-block: 8px;
  }

  .primary-nav {
    order: 3;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    border-top: 1px solid transparent;
    transition: max-height 220ms var(--ease), border-color var(--dur) var(--ease);
  }

  .site-header[data-open] .primary-nav {
    max-height: min(60vh, 420px);
    overflow-y: auto;
    border-top-color: var(--line-soft);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 8px;
  }

  .nav-list__item { display: block; }

  .nav-link {
    display: block;
    padding: 12px 6px;
    border-bottom: 1px solid rgba(51, 80, 122, 0.4);
    border-left: 2px solid transparent;
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: rgba(51, 80, 122, 0.4);
    border-left-color: var(--gold-400);
  }

  .header-lower__status {
    margin-left: auto;
    padding-left: 0;
    border-left: 0;
  }

  .bento { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .bento__cell { grid-column: span 3; }
  .bento__cell--2x1,
  .bento__cell--3x1,
  .bento__cell--2x2 { grid-column: span 6; grid-row: auto; min-height: 200px; }

  .footer-top { grid-template-columns: minmax(0, 1fr); }

  .footer-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 767px) {
  .header-upper__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-block: 14px;
  }

  .header-rail { width: 100%; justify-content: space-between; }

  .brand__mark { font-size: 22px; }

  .version-switch__label { padding-inline: 8px; font-size: 10.5px; }

  .version-switch__btn { padding: 6px 11px; font-size: 12.5px; }

  .header-lower__status { font-size: 11px; gap: 6px; }

  .header-lower__status-text { display: none; }

  .footer-columns { grid-template-columns: minmax(0, 1fr); }

  .footer-bottom { gap: 10px 16px; }

  .to-top { margin-left: 0; }

  .timeline { grid-auto-columns: minmax(200px, 82%); }
}

@media (max-width: 640px) {
  .bento { grid-template-columns: minmax(0, 1fr); }
  .bento__cell,
  .bento__cell--2x1,
  .bento__cell--3x1,
  .bento__cell--2x2 { grid-column: span 1; }

  .media-frame--wide { aspect-ratio: 16 / 10; }
}

/* 25. Reduced motion ------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html.js [data-reveal] { opacity: 1; transform: none; }

  .btn:hover,
  .paper-card:hover,
  .bento__cell:hover { transform: none; }

  .footer-link:hover { padding-left: 0; }
}