/* ============================================================
   bet9登录中心 · 版本档案馆 — 共享样式 /assets/site.css
   ============================================================ */

:root {
  --ink: #0B1B2B;
  --ink-panel: #16293D;
  --blue-line: #24405A;
  --amber: #E9A93B;
  --amber-bright: #F6C86A;
  --paper: #F2E8D5;
  --paper-edge: #D9CBB2;
  --cinnabar: #C0392B;
  --cinnabar-light: #E2685A;
  --tin: #8FA3B5;

  --rail-w: 220px;
  --topbar-h: 44px;
  --shell-max: 1180px;
  --shell-pad: 32px;
  --edge-blank: 60px;

  --font-head: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --shadow-hard: 0 8px 0 0 #050F19;
  --shadow-hard-sm: 0 6px 0 0 #050F19;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(36, 64, 90, 0.28) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 64, 90, 0.18) 1px, transparent 1px);
  background-size: 88px 88px, 88px 88px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.06;
  margin: 0;
  text-wrap: balance;
}

h1 { font-size: clamp(2.05rem, 5vw, 4.4rem); }
h2 { font-size: clamp(1.4rem, 2.6vw, 2.2rem); }
h3 { font-size: 1.25rem; line-height: 1.3; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

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

a { color: var(--amber); text-decoration: none; }
a:hover { color: var(--amber-bright); }

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

button { font: inherit; color: inherit; }

::selection { background: var(--amber); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

/* ---------- skip link ---------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 12px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--amber);
  color: var(--ink);
  font-weight: 700;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard-sm);
  transition: top 160ms var(--ease);
}
.skip-link:focus {
  top: 12px;
  color: var(--ink);
}

/* ---------- shell ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
}

main { display: block; }
#main-content { scroll-margin-top: 24px; }

/* ---------- header ---------- */
.site-header {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  z-index: 100;
}

.topbar {
  height: var(--topbar-h);
  background: var(--ink);
  border-bottom: 1px solid var(--blue-line);
  display: flex;
  align-items: center;
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 100%;
}
.topbar__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.topbar__brand-link {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  color: var(--paper);
  white-space: nowrap;
}
.topbar__brand-link:hover { color: var(--amber); }
.topbar__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber);
  border: 1px solid var(--blue-line);
  background: var(--ink-panel);
  padding: 2px 8px;
  white-space: nowrap;
}
.topbar__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--tin);
}
.topbar__meta-divider {
  width: 1px;
  height: 14px;
  background: var(--blue-line);
}
.topbar__meta-item { white-space: nowrap; }

/* ---------- side rail (desktop) ---------- */
.rail {
  display: block;
  width: var(--rail-w);
  border-right: 1px solid var(--blue-line);
  background: var(--ink);
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  bottom: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.rail__inner {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 24px 0 16px;
}
.rail__note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--tin);
  padding: 0 20px 16px;
  margin: 0;
  border-bottom: 1px dashed var(--blue-line);
}
.rail__nav { padding: 16px 0; }
.rail__list { display: flex; flex-direction: column; gap: 2px; }
.rail__item { position: relative; }
.rail__link {
  display: grid;
  grid-template-columns: 34px 1fr;
  grid-template-areas:
    "idx label"
    "idx desc";
  column-gap: 6px;
  align-items: center;
  padding: 10px 18px 10px 20px;
  color: var(--paper);
  border-left: 6px solid transparent;
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease), color 160ms var(--ease);
}
.rail__index {
  grid-area: idx;
  font-size: 12px;
  color: var(--tin);
  letter-spacing: 0.06em;
  align-self: start;
  padding-top: 2px;
  transition: color 160ms var(--ease);
}
.rail__label {
  grid-area: label;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  line-height: 1.35;
}
.rail__desc {
  grid-area: desc;
  font-size: 12px;
  line-height: 1.5;
  color: var(--tin);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.rail__link:hover {
  background: var(--ink-panel);
  border-left-color: var(--blue-line);
  color: var(--amber-bright);
}
.rail__link:hover .rail__index { color: var(--amber); }
.rail__link[aria-current="page"] {
  background: var(--ink-panel);
  border-left-color: var(--amber);
  color: var(--amber-bright);
}
.rail__link[aria-current="page"] .rail__index { color: var(--amber-bright); }
.rail__link[aria-current="page"] .rail__label { text-decoration: underline; text-underline-offset: 4px; }
.rail__link[aria-current="page"] .rail__desc { color: var(--amber); }

.rail__tags {
  margin-top: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--blue-line);
  border-top: 1px solid var(--blue-line);
}
.rail__tag {
  background: var(--ink);
  color: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 76px;
  padding: 12px 6px;
  transition: background-color 160ms var(--ease), color 160ms var(--ease), transform 160ms var(--ease);
}
.rail__tag span {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
}
.rail__tag:hover {
  background: var(--amber);
  color: var(--ink);
  transform: rotate(-1.5deg);
}

/* ---------- mobile nav toggle ---------- */
.nav-toggle {
  display: none;
  position: fixed;
  top: calc(var(--topbar-h) + 8px);
  right: 14px;
  z-index: 130;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--amber);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard-sm);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease);
}
.nav-toggle:hover { transform: translateY(-2px); box-shadow: 0 8px 0 0 #050F19; }
.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: var(--ink);
  transition: transform 160ms var(--ease), opacity 160ms var(--ease);
}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ---------- drawer (mobile) ---------- */
.drawer {
  display: none;
  position: fixed;
  inset: var(--topbar-h) 0 0 0;
  z-index: 120;
  background: var(--ink);
  border-top: 3px solid var(--amber);
  padding: 20px 20px 28px;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.site-header[data-open="true"] .drawer { display: flex; flex-direction: column; }
.drawer__head {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--blue-line);
}
.drawer__brand {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  color: var(--paper);
}
.drawer__code {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber);
}
.drawer__nav { padding: 12px 0; }
.drawer__list { display: flex; flex-direction: column; }
.drawer__item + .drawer__item { border-top: 1px solid var(--blue-line); }
.drawer__link {
  display: grid;
  grid-template-columns: 44px 1fr;
  align-items: center;
  gap: 10px;
  padding: 14px 4px;
  color: var(--paper);
  border-left: 6px solid transparent;
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease);
}
.drawer__index { font-size: 12px; color: var(--tin); letter-spacing: 0.08em; }
.drawer__label { font-family: var(--font-head); font-weight: 800; font-size: 1.05rem; }
.drawer__link:hover { background: var(--ink-panel); border-left-color: var(--blue-line); color: var(--amber-bright); }
.drawer__link[aria-current="page"] {
  background: var(--ink-panel);
  border-left-color: var(--amber);
  color: var(--amber-bright);
}
.drawer__link[aria-current="page"] .drawer__index { color: var(--amber-bright); }
.drawer__tags {
  margin-top: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding-top: 20px;
}
.drawer__tag {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  background: var(--ink-panel);
  color: var(--paper);
  border: 2px solid var(--blue-line);
  box-shadow: var(--shadow-hard-sm);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  transition: transform 160ms var(--ease), background-color 160ms var(--ease), color 160ms var(--ease);
}
.drawer__tag:hover {
  background: var(--amber);
  color: var(--ink);
  transform: rotate(-1.5deg);
}

/* ---------- scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--amber);
  z-index: 200;
  pointer-events: none;
}

/* ---------- layout grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}
.grid--lines {
  background-image: repeating-linear-gradient(
    to right,
    transparent 0,
    transparent calc((100% / 12) - 1px),
    rgba(36, 64, 90, 0.6) calc((100% / 12) - 1px),
    rgba(36, 64, 90, 0.6) calc(100% / 12)
  );
}
.grid--asym { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid__col-8 { grid-column: span 8; }
.grid__col-7 { grid-column: span 7; }
.grid__col-5 { grid-column: span 5; }
.grid__col-4 { grid-column: span 4; }
.grid__col-3 { grid-column: span 3; }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--8 { grid-template-columns: repeat(8, minmax(0, 1fr)); }

/* ---------- breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--tin);
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  color: var(--blue-line);
}
.breadcrumbs__item a { color: var(--tin); }
.breadcrumbs__item a:hover { color: var(--amber); }
.breadcrumbs__item [aria-current="page"] { color: var(--amber); }

/* ---------- page head ---------- */
.page-head {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: 24px;
  padding: 40px 0 56px;
  border-bottom: 3px solid var(--blue-line);
}
.page-head__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
  margin-bottom: 18px;
}
.page-head__title { color: var(--paper); }
.page-head__lead {
  margin-top: 20px;
  max-width: 46ch;
  color: var(--tin);
  font-size: 1rem;
  line-height: 1.8;
}
.page-head__aside {
  align-self: end;
  padding: 18px;
  background: var(--ink-panel);
  border: 2px solid var(--blue-line);
  box-shadow: var(--shadow-hard-sm);
  font-size: 13px;
  color: var(--tin);
}

/* ---------- sections ---------- */
.section { padding: 64px 0; }
.section--paper {
  background: var(--paper);
  color: var(--ink);
  border-block: 3px solid var(--ink);
}
.section--panel {
  background: var(--ink-panel);
  border-block: 3px solid var(--blue-line);
}
.section--paper a { color: #8A4B12; }
.section--paper a:hover { color: #C0392B; }
.section--paper .mono { color: #5E4A2E; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: 32px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--blue-line);
}
.section--paper .section-head { border-bottom-color: var(--paper-edge); }
.section-head__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
  margin: 0;
}
.section--paper .section-head__kicker { color: var(--cinnabar); }
.section-head__title { font-size: clamp(1.35rem, 2.4vw, 1.9rem); }
.section-head__more { margin-left: auto; font-size: 13px; }

/* ---------- paper sheet ---------- */
.paper-sheet {
  background: var(--paper);
  color: var(--ink);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-hard);
  padding: 24px;
}
.paper-sheet a { color: #8A4B12; }
.paper-sheet a:hover { color: var(--cinnabar); }
.paper-sheet .mono { color: #5E4A2E; }

/* ---------- cards ---------- */
.stack { display: grid; gap: 20px; }
.stack--offset > *:nth-child(3n + 1) { transform: translateY(calc(var(--offset, 0px) * -1 + 0px)); }
.stack--offset > *:nth-child(3n + 2) { transform: translateY(8px); }
.stack--offset > *:nth-child(3n + 3) { transform: translateY(-6px); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--ink-panel);
  color: var(--paper);
  border: 2px solid var(--blue-line);
  box-shadow: 0 8px 0 0 #050F19;
  padding: 20px;
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease), border-color 160ms var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 0 0 #050F19;
  border-color: var(--blue-line);
}
.card__bar {
  height: 6px;
  width: 56px;
  background: var(--amber);
}
.card__bar--amber { background: var(--amber); }
.card__bar--cinnabar { background: var(--cinnabar-light); }
.card__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
  word-break: break-all;
}
.card__title { font-size: 1.15rem; line-height: 1.3; }
.card__text { font-size: 0.95rem; color: var(--tin); line-height: 1.7; }
.card__meta {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
}
.card--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--ink);
  box-shadow: var(--shadow-hard);
}
.card--paper .card__text { color: #3C3222; }
.card--paper .card__code { color: #8A4B12; }

/* ---------- tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  border: 1px solid currentColor;
  background: transparent;
  color: var(--tin);
  white-space: nowrap;
}
.tag--amber { color: var(--amber); background: rgba(233, 169, 59, 0.12); }
.tag--cinnabar {
  color: var(--paper);
  background: var(--cinnabar);
  border-color: var(--cinnabar);
}
.section--paper .tag--cinnabar,
.paper-sheet .tag--cinnabar { color: var(--paper); }
.tag--ghost { color: var(--tin); border-color: var(--blue-line); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow-hard-sm);
  cursor: pointer;
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease), background-color 160ms var(--ease), color 160ms var(--ease);
}
.btn:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 0 0 #050F19;
  color: var(--ink);
}
.btn--primary {
  background: var(--amber);
  border-color: var(--ink);
  color: var(--ink);
}
.btn--primary:hover { background: var(--amber-bright); color: var(--ink); }
.btn--ghost {
  background: transparent;
  border-color: var(--amber);
  color: var(--amber);
  box-shadow: none;
}
.btn--ghost:hover {
  background: var(--amber);
  color: var(--ink);
  box-shadow: var(--shadow-hard-sm);
}
.section--paper .btn--ghost { border-color: var(--ink); color: var(--ink); }
.section--paper .btn--ghost:hover { background: var(--ink); color: var(--paper); }

.text-link {
  display: inline-block;
  font-weight: 700;
  color: var(--amber);
  border-bottom: 2px solid currentColor;
  padding-bottom: 1px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.text-link:hover { color: var(--amber-bright); }

/* ---------- rules ---------- */
.rule { height: 1px; background: var(--blue-line); border: 0; margin: 0; }
.rule--dashed {
  height: 0;
  background: none;
  border-top: 1px dashed var(--blue-line);
}
.section--paper .rule { background: var(--paper-edge); }
.section--paper .rule--dashed { background: none; border-top-color: var(--paper-edge); }

/* ---------- utility ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

/* ---------- figure ---------- */
.figure {
  position: relative;
  margin: 0;
  background: var(--ink-panel);
  border: 3px solid var(--blue-line);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}
.figure__img {
  width: 100%;
  aspect-ratio: 4 / 3;
  background-color: var(--ink-panel);
  background-image:
    repeating-linear-gradient(45deg, rgba(36, 64, 90, 0.5) 0 2px, transparent 2px 10px);
  display: block;
  object-fit: cover;
}
.figure--wide .figure__img { aspect-ratio: 16 / 9; }
.figure--portrait .figure__img { aspect-ratio: 3 / 4; }
.figure__caption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--tin);
  border-top: 1px solid var(--blue-line);
  background: var(--ink);
}
.section--paper .figure__caption { background: var(--ink); color: var(--paper); }

/* ---------- reveal & filter states ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}
[data-filtered="out"] { display: none !important; }

/* ---------- footer ---------- */
.site-footer {
  margin-top: 0;
  background: var(--ink);
  border-top: 3px solid var(--amber);
  color: var(--paper);
}
.footer__inner { padding-block: 56px 28px; }
.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 6fr) minmax(0, 3fr);
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px dashed var(--blue-line);
}
.footer__card { display: flex; flex-direction: column; gap: 10px; }
.footer__card-code {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #8A4B12;
}
.footer__card-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink);
}
.footer__card-text {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #3C3222;
  margin: 0;
}
.footer__nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}
.footer__col-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}
.footer__list { display: flex; flex-direction: column; gap: 8px; }
.footer__link {
  font-size: 0.9rem;
  color: var(--paper);
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.footer__link:hover { color: var(--amber); border-bottom-color: var(--amber); }
.footer__contact { display: flex; flex-direction: column; }
.footer__contact-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  margin: 0 0 12px;
  color: var(--amber);
}
.footer__contact-list { display: flex; flex-direction: column; gap: 10px; font-size: 0.86rem; }
.footer__contact-list li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 8px;
  align-items: start;
}
.footer__contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--tin);
  padding-top: 2px;
}
.footer__contact-val { color: var(--paper); }
.footer__contact-list .footer__link { word-break: break-all; }
.footer__icp {
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--tin);
  border-top: 1px solid var(--blue-line);
  padding-top: 10px;
}
.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding-top: 20px;
  font-size: 12px;
  color: var(--tin);
}
.footer__copy, .footer__hours { margin: 0; }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  :root { --rail-w: 200px; --shell-pad: 24px; --edge-blank: 24px; }
  .page-head { grid-template-columns: minmax(0, 1fr); }
  .page-head__aside { max-width: 420px; }
  .grid__col-8, .grid__col-7, .grid__col-5, .grid__col-4, .grid__col-3 { grid-column: span 12; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__top { grid-template-columns: minmax(0, 1fr); }
  .footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
}

@media (max-width: 860px) {
  body { font-size: 16px; }
  .topbar__meta { font-size: 11px; }
  .topbar__meta-item:first-child { display: none; }
  .nav-toggle { display: inline-flex; }
  .rail { display: none; }
  .site-header { padding-bottom: 0; }
  .section { padding: 44px 0; }
  .page-head { padding: 28px 0 40px; }
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .stack--offset > * { transform: none !important; }
  .footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  :root { --shell-pad: 18px; --topbar-h: 48px; }
  .topbar__tag { display: none; }
  .topbar__brand-link { font-size: 0.86rem; }
  .topbar__meta-item { font-size: 10px; }
  .nav-toggle__text { display: none; }
  .nav-toggle { top: calc(var(--topbar-h) + 6px); right: 12px; padding: 9px 11px; }
  h1 { font-size: clamp(1.8rem, 8vw, 2.4rem); }
  .footer__nav { grid-template-columns: minmax(0, 1fr); }
  .footer__contact-list li { grid-template-columns: 36px 1fr; }
}

@media (min-width: 861px) {
  body { padding-left: var(--rail-w); }
  .site-header { padding-left: 0; }
  .topbar__inner { padding-left: calc(var(--shell-pad)); }
  main { padding-right: var(--edge-blank); }
}

@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;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .card:hover, .btn:hover, .rail__tag:hover, .drawer__tag:hover { transform: none; }
}