/* =========================================================
   /assets/site.css — 国米官网 · LETOU 品牌站 共享样式
   轨道导航 / 目录式内容地图 / 珠宝色分区
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--top-h) + 20px);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-strong);
  background: var(--paper);
  padding-left: var(--rail-w);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd {
  margin: 0;
}

ul, ol { margin: 0; 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; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

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

:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 3px;
  border-radius: 4px;
}

.band--ink :focus-visible,
.band--indigo :focus-visible,
.band--teal :focus-visible,
.site-header :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--gold);
}

/* ---------- 2. Tokens ---------- */
:root {
  --ink-navy: #0B1B3A;
  --ink-navy-deep: #08152C;
  --deep-indigo: #1B1F5C;
  --deep-teal: #0E3B3A;
  --electric: #2E7BFF;
  --electric-ink: #1B5FD9;
  --gold: #F2C14E;
  --wine: #6E1F3A;

  --paper: #F5F7FB;
  --surface: #FFFFFF;

  --text-strong: #101828;
  --text-muted: #5A6478;
  --line: #D7DEEA;

  --oninverse: #EDF0FA;
  --oninverse-muted: rgba(237, 240, 250, 0.66);

  --rail-w: 88px;
  --top-h: 64px;

  --r-xl: 34px;
  --r-lg: 24px;
  --r-md: 16px;
  --r-pill: 999px;

  --shadow-1: 0 1px 2px rgba(11, 27, 58, 0.06), 0 14px 30px -20px rgba(11, 27, 58, 0.4);
  --shadow-2: 0 2px 8px rgba(11, 27, 58, 0.08), 0 28px 54px -28px rgba(11, 27, 58, 0.5);

  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular,
    Menlo, Consolas, "Courier New", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --section-y: clamp(72px, 10vw, 160px);

  --step-12: 12px;
  --step-14: 14px;
  --step-17: 17px;
  --step-21: 21px;
  --step-28: 28px;
  --step-40: 40px;
  --step-64: 64px;
  --step-96: 96px;
  --step-132: 132px;
}

@media (min-width: 1024px) {
  html { scroll-padding-top: 40px; }
}

/* ---------- 3. Layout shells ---------- */
.shell {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 56px);
}

.shell--narrow { max-width: 880px; }

.band {
  position: relative;
  padding-block: var(--section-y);
}

.band--paper { background: var(--paper); color: var(--text-strong); }
.band--surface { background: var(--surface); color: var(--text-strong); }
.band--ink { background: var(--ink-navy); color: var(--oninverse); }
.band--indigo { background: var(--deep-indigo); color: var(--oninverse); }
.band--teal { background: var(--deep-teal); color: #E9F5F1; }

.band--ink .lead,
.band--indigo .lead,
.band--teal .lead { color: var(--oninverse-muted); }

.band--ink .section-head__note,
.band--indigo .section-head__note,
.band--teal .section-head__note { color: var(--oninverse-muted); }

.band--ink .muted,
.band--indigo .muted,
.band--teal .muted { color: var(--oninverse-muted); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 32px);
}

.span-1 { grid-column: span 1; }
.span-2 { grid-column: span 2; }
.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-10 { grid-column: span 10; }
.span-11 { grid-column: span 11; }
.span-12 { grid-column: span 12; }

.stack {
  display: grid;
  gap: var(--stack-gap, 16px);
  align-content: start;
}

/* ---------- 4. Typography ---------- */
.display {
  font-size: clamp(56px, 9vw, 132px);
  line-height: 0.92;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 0;
}

.display--ghost {
  color: transparent;
  -webkit-text-stroke: 1px rgba(46, 123, 255, 0.5);
}

.band--ink .display--ghost,
.band--indigo .display--ghost { -webkit-text-stroke-color: rgba(242, 193, 78, 0.55); }

.h1 {
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.015em;
}

.h2 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.h3 {
  font-size: var(--step-21);
  line-height: 1.4;
  font-weight: 700;
}

.lead {
  font-size: var(--step-21);
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 56ch;
}

.prose {
  max-width: 68ch;
  font-size: var(--step-17);
  line-height: 1.75;
  color: var(--text-strong);
}

.prose > * + * { margin-top: 1.05em; }
.prose h2 { font-size: var(--step-28); font-weight: 800; line-height: 1.25; margin-top: 1.8em; }
.prose h3 { font-size: var(--step-21); font-weight: 700; margin-top: 1.5em; }
.prose ul, .prose ol { padding-left: 1.2em; list-style: disc; }
.prose li + li { margin-top: 0.5em; }
.prose strong { font-weight: 700; }

.muted { color: var(--text-muted); font-size: var(--step-14); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--electric-ink);
}

.band--ink .eyebrow,
.band--indigo .eyebrow,
.band--teal .eyebrow { color: var(--gold); }

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.num--accent {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--text-strong);
  border-bottom: 2px solid var(--gold);
  padding-bottom: 1px;
}

.band--ink .num--accent,
.band--indigo .num--accent,
.band--teal .num--accent {
  color: var(--gold);
  border-bottom-color: rgba(242, 193, 78, 0.45);
}

.link {
  position: relative;
  display: inline-block;
  color: var(--electric-ink);
  font-weight: 600;
}

.link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms var(--ease);
}

.link:hover::after,
.link:focus-visible::after { transform: scaleX(1); }

.band--ink .link,
.band--indigo .link,
.band--teal .link { color: #8FB8FF; }

/* ---------- 5. Section head (编号 + 标题 + 旁注) ---------- */
.section-head {
  display: grid;
  gap: 12px;
  max-width: 780px;
  margin-bottom: clamp(28px, 4vw, 56px);
}

.section-head__no {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--step-14);
  letter-spacing: 0.16em;
  color: var(--electric-ink);
}

.section-head__no::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  flex: none;
}

.band--ink .section-head__no,
.band--indigo .section-head__no,
.band--teal .section-head__no { color: var(--gold); }

.section-head__title {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.section-head__note {
  font-size: var(--step-14);
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 62ch;
}

/* ---------- 6. Buttons & chips ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: var(--step-14);
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background-color 200ms var(--ease), color 200ms var(--ease),
    border-color 200ms var(--ease), transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

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

.btn--gold { background: var(--gold); color: var(--ink-navy); }
.btn--gold:hover { background: #FFD177; box-shadow: 0 14px 26px -16px rgba(242, 193, 78, 0.9); }

.btn--blue { background: var(--electric); color: #FFFFFF; }
.btn--blue:hover { background: #4A8CFF; box-shadow: 0 14px 26px -16px rgba(46, 123, 255, 0.9); }

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text-strong);
}

.btn--ghost:hover { border-color: var(--electric); color: var(--electric-ink); }

.btn--onDark {
  background: transparent;
  border-color: rgba(237, 240, 250, 0.32);
  color: var(--oninverse);
}

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

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  color: var(--text-muted);
  white-space: nowrap;
}

.chip--gold {
  background: rgba(242, 193, 78, 0.16);
  border-color: rgba(242, 193, 78, 0.55);
  color: #8A6210;
}

.chip--blue {
  background: rgba(46, 123, 255, 0.12);
  border-color: rgba(46, 123, 255, 0.4);
  color: var(--electric-ink);
}

.chip--wine {
  background: var(--wine);
  border-color: var(--wine);
  color: #FFFFFF;
}

.chip--teal {
  background: rgba(14, 59, 58, 0.1);
  border-color: rgba(14, 59, 58, 0.35);
  color: var(--deep-teal);
}

.status-chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 11px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(242, 193, 78, 0.55);
  background: rgba(242, 193, 78, 0.08);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.1em;
  line-height: 1.4;
}

.status-chip--solid {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink-navy);
  font-weight: 700;
}

/* ---------- 7. Cards / frames / lists ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(20px, 3vw, 32px);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease),
    border-color 180ms var(--ease);
}

.card--lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  border-color: #C3CEDF;
}

.frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  background:
    linear-gradient(135deg, rgba(46, 123, 255, 0.18), rgba(242, 193, 78, 0.12)),
    var(--ink-navy);
  border: 1px solid rgba(46, 123, 255, 0.2);
}

.frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.frame--wide { aspect-ratio: 16 / 9; }
.frame--tall { aspect-ratio: 4 / 5; }
.frame--square { aspect-ratio: 1 / 1; }
.frame--diag { clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%); }

.frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.band--ink .frame__caption,
.band--indigo .frame__caption,
.band--teal .frame__caption { color: var(--oninverse-muted); }

.breadcrumb { padding-block: clamp(20px, 3vw, 32px) 0; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--line);
}

.breadcrumb__link {
  position: relative;
  transition: color 200ms var(--ease);
}

.breadcrumb__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: var(--electric);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms var(--ease);
}

.breadcrumb__link:hover { color: var(--electric-ink); }
.breadcrumb__link:hover::after { transform: scaleX(1); }

.breadcrumb__item [aria-current="page"] { color: var(--text-strong); font-weight: 700; }

/* 目录式索引行 */
.index-list { display: grid; gap: 2px; }

.index-list__item { border-bottom: 1px solid var(--line); }

.band--ink .index-list__item,
.band--indigo .index-list__item,
.band--teal .index-list__item { border-bottom-color: rgba(237, 240, 250, 0.16); }

.index-list__link {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 18px 6px;
  transition: padding-left 240ms var(--ease), color 200ms var(--ease);
}

.index-list__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: var(--electric);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms var(--ease);
}

.index-list__link:hover { padding-left: 16px; color: var(--electric-ink); }
.band--ink .index-list__link:hover,
.band--indigo .index-list__link:hover,
.band--teal .index-list__link:hover { color: var(--gold); }
.index-list__link:hover::after { transform: scaleX(1); }

.index-list__num {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.14em;
  color: var(--electric-ink);
}

.band--ink .index-list__num,
.band--indigo .index-list__num,
.band--teal .index-list__num { color: var(--gold); }

.index-list__meta {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  color: var(--text-muted);
}

.band--ink .index-list__meta,
.band--indigo .index-list__meta,
.band--teal .index-list__meta { color: var(--oninverse-muted); }

/* 折叠面板 */
.fold {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface);
  overflow: hidden;
}

.fold + .fold { margin-top: 12px; }

.fold > summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 22px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  transition: background-color 200ms var(--ease), color 200ms var(--ease);
}

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

.fold > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--step-21);
  line-height: 1;
  color: var(--electric-ink);
  transition: color 200ms var(--ease);
}

.fold[open] > summary { background: rgba(46, 123, 255, 0.06); }
.fold[open] > summary::after { content: "–"; color: var(--gold); }
.fold > summary:hover { background: rgba(46, 123, 255, 0.08); }

.fold__body {
  padding: 0 22px 20px;
  color: var(--text-muted);
  font-size: var(--step-14);
  line-height: 1.75;
}

/* 费用矩阵 */
.matrix {
  width: 100%;
  font-size: var(--step-14);
}

.matrix th,
.matrix td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.matrix thead th {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.12em;
  color: var(--text-muted);
  font-weight: 500;
}

.matrix tbody tr { transition: background-color 180ms var(--ease); }
.matrix tbody tr:hover { background: rgba(46, 123, 255, 0.06); }

.matrix .num { color: var(--text-strong); font-weight: 700; }

/* 时间线 */
.timeline {
  border-left: 2px solid var(--line);
  padding-left: clamp(18px, 3vw, 28px);
}

.timeline__item { position: relative; padding-block: 18px; }

.timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(18px, 3vw, 28px) - 7px);
  top: 27px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--paper);
}

.band--ink .timeline, .band--indigo .timeline, .band--teal .timeline { border-left-color: rgba(237, 240, 250, 0.22); }
.band--ink .timeline__item::before,
.band--indigo .timeline__item::before,
.band--teal .timeline__item::before { box-shadow: 0 0 0 4px var(--ink-navy); }

/* 胶囊筛选 */
.chip-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.chip-filter__btn {
  padding: 8px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  color: var(--text-muted);
  transition: background-color 200ms var(--ease), color 200ms var(--ease),
    border-color 200ms var(--ease);
}

.chip-filter__btn:hover { border-color: var(--electric); color: var(--electric-ink); }

.chip-filter__btn[aria-pressed="true"] {
  background: var(--ink-navy);
  border-color: var(--ink-navy);
  color: var(--gold);
}

/* ---------- 8. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 400;
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--gold);
  color: var(--ink-navy);
  font-size: var(--step-14);
  font-weight: 700;
  transform: translateY(-180%);
  transition: transform 200ms var(--ease);
}

.skip-link:focus { transform: translateY(0); }

@media (min-width: 1024px) {
  .skip-link { left: calc(var(--rail-w) + 14px); }
}

/* ---------- 9. Header / rail navigation ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 120;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0 22px;
  background: var(--ink-navy);
  color: var(--oninverse);
  border-right: 1px solid rgba(46, 123, 255, 0.24);
}

.rail-brand {
  display: flex;
  justify-content: center;
  width: 100%;
}

.rail-brand__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.rail-brand__mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 16px;
  background: linear-gradient(160deg, var(--gold), #D79B1E);
  color: var(--ink-navy);
  font-size: 15px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.06em;
  writing-mode: vertical-rl;
  text-orientation: upright;
  box-shadow: 0 12px 24px -14px rgba(242, 193, 78, 0.95);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.rail-brand__link:hover .rail-brand__mark {
  transform: translateY(-2px);
  box-shadow: 0 18px 30px -14px rgba(242, 193, 78, 1);
}

.rail-brand__tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 15px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(237, 240, 250, 0.24);
  color: var(--oninverse);
  font-size: var(--step-14);
  font-weight: 700;
  transition: border-color 200ms var(--ease), color 200ms var(--ease),
    background-color 200ms var(--ease);
}

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

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}

.site-header[data-open="true"] .nav-toggle__bars i:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }

.site-header[data-open="true"] .nav-toggle__bars i:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.rail-nav {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.rail-nav__list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 100%;
}

.rail-nav__item { width: 64px; }

.rail-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 64px;
  min-height: 58px;
  border-radius: var(--r-md);
  color: #8FA2C6;
  transition: color 200ms var(--ease), background-color 200ms var(--ease);
}

.rail-nav__link::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 50%;
  width: 3px;
  height: 26px;
  border-radius: 2px;
  background: var(--gold);
  transform: translateY(-50%) scaleY(0);
  transform-origin: center;
  transition: transform 200ms var(--ease);
}

.rail-nav__link:hover {
  color: #EAF0FF;
  background: rgba(46, 123, 255, 0.16);
}

.rail-nav__link[aria-current="page"] {
  color: var(--gold);
  background: rgba(242, 193, 78, 0.1);
}

.rail-nav__link[aria-current="page"]::before { transform: translateY(-50%) scaleY(1); }

.rail-nav__no {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  line-height: 1;
}

.rail-nav__label,
.rail-cta__label {
  position: absolute;
  left: calc(100% + 14px);
  top: 50%;
  z-index: 6;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  background: var(--surface);
  color: var(--text-strong);
  font-family: var(--font-sans);
  font-size: var(--step-14);
  font-weight: 700;
  line-height: 1.4;
  white-space: nowrap;
  box-shadow: var(--shadow-2);
  opacity: 0;
  visibility: hidden;
  transform: translate(-10px, -50%);
  pointer-events: none;
  transition: opacity 200ms var(--ease), transform 200ms var(--ease), visibility 200ms;
}

.rail-nav__link:hover .rail-nav__label,
.rail-nav__link:focus-visible .rail-nav__label,
.rail-cta:hover .rail-cta__label,
.rail-cta:focus-visible .rail-cta__label {
  opacity: 1;
  visibility: visible;
  transform: translate(0, -50%);
}

.rail-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.rail-cta {
  position: relative;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gold);
  color: var(--ink-navy);
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  transition: background-color 200ms var(--ease), color 200ms var(--ease),
    border-color 200ms var(--ease), transform 180ms var(--ease);
}

.rail-cta:hover { background: #FFD177; transform: translateY(-2px); }

.rail-cta--ghost {
  background: transparent;
  border: 1px solid rgba(46, 123, 255, 0.55);
  color: #CFE0FF;
}

.rail-cta--ghost:hover {
  background: rgba(46, 123, 255, 0.18);
  border-color: var(--electric);
  color: #FFFFFF;
}

.rail-cta__glyph { line-height: 1; }

.rail-progress {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 2px;
  background: rgba(237, 240, 250, 0.08);
  pointer-events: none;
}

.rail-progress__fill {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--electric), var(--gold));
  transform: scaleY(var(--p, 0));
  transform-origin: top center;
  transition: transform 120ms linear;
}

/* ---------- 10. Footer ---------- */
.site-footer {
  position: relative;
  background: var(--ink-navy);
  color: #C9D5EC;
  padding-block: clamp(48px, 7vw, 84px) 30px;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--electric) 0%, rgba(46, 123, 255, 0.18) 68%, transparent 100%);
}

.site-footer__inner {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 56px);
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(0, 2.1fr);
  gap: clamp(32px, 5vw, 72px);
}

.site-footer__brand {
  display: grid;
  gap: 14px;
  align-content: start;
}

.site-footer__mark {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 18px;
  background: linear-gradient(160deg, var(--gold), #D79B1E);
  color: var(--ink-navy);
  font-size: 16px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.06em;
  writing-mode: vertical-rl;
  text-orientation: upright;
  transition: transform 180ms var(--ease);
}

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

.site-footer__brandline {
  font-size: var(--step-14);
  line-height: 1.7;
  color: var(--oninverse-muted);
  max-width: 22ch;
}

.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 44px);
}

.site-footer__col-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.site-footer__links { display: grid; gap: 10px; }

.site-footer__link {
  position: relative;
  display: inline-block;
  font-size: var(--step-14);
  color: #C9D5EC;
  transition: color 200ms var(--ease);
}

.site-footer__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms var(--ease);
}

.site-footer__link:hover { color: #FFFFFF; }
.site-footer__link:hover::after { transform: scaleX(1); }

.site-footer__contact {
  margin-top: clamp(36px, 5vw, 64px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid rgba(237, 240, 250, 0.14);
  display: grid;
  gap: 14px;
}

.site-footer__contact-title {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.18em;
  color: var(--gold);
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
}

.contact-row__label {
  flex: none;
  min-width: 72px;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.12em;
  color: #7E8FB4;
}

.contact-row__value {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--gold);
  word-break: break-all;
}

.contact-row__value--plain {
  font-family: var(--font-sans);
  font-size: var(--step-14);
  line-height: 1.7;
  letter-spacing: 0;
  color: #C9D5EC;
}

.contact-row__hours {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  color: #7E8FB4;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(46, 123, 255, 0.5);
  color: #9CC0FF;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  transition: background-color 200ms var(--ease), color 200ms var(--ease),
    border-color 200ms var(--ease);
}

.copy-btn:hover {
  background: rgba(46, 123, 255, 0.18);
  border-color: var(--electric);
  color: #FFFFFF;
}

.copy-btn[data-copied="true"] {
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(242, 193, 78, 0.12);
}

.site-footer__note {
  max-width: 78ch;
  font-size: var(--step-12);
  line-height: 1.8;
  color: #7E8FB4;
}

.site-footer__legal {
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: 20px;
  border-top: 1px solid rgba(237, 240, 250, 0.14);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.06em;
  color: #7E8FB4;
}

.site-footer__legal-item { display: inline-block; }

/* ---------- 11. To top ---------- */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 110;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--ink-navy);
  border: 1px solid rgba(242, 193, 78, 0.42);
  color: var(--gold);
  font-size: 18px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 200ms var(--ease), transform 200ms var(--ease),
    visibility 200ms, border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.to-top:hover { border-color: var(--gold); background: #12274E; }

.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 12. Responsive ---------- */
@media (max-width: 1100px) {
  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-7, .span-8, .span-9, .span-10 { grid-column: span 12; }
  .site-footer__top { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 1023px) {
  body {
    padding-left: 0;
    padding-top: var(--top-h);
  }

  .site-header {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--top-h);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(16px, 4vw, 24px);
    border-right: 0;
    border-bottom: 1px solid rgba(46, 123, 255, 0.28);
  }

  .rail-brand { width: auto; }

  .rail-brand__link {
    flex-direction: row;
    align-items: center;
    gap: 10px;
  }

  .rail-brand__mark {
    width: 34px;
    height: 34px;
    border-radius: 11px;
    font-size: 12px;
    box-shadow: none;
  }

  .rail-brand__tag { font-size: 10px; }

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

  .rail-nav {
    position: fixed;
    top: var(--top-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 130;
    display: block;
    background: var(--ink-navy);
    padding: 22px clamp(16px, 4vw, 24px) 160px;
    overflow-y: auto;
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform 300ms var(--ease), visibility 300ms;
  }

  .site-header[data-open="true"] .rail-nav {
    transform: translateX(0);
    visibility: visible;
  }

  .rail-nav__list { gap: 0; width: 100%; }

  .rail-nav__item { width: 100%; }

  .rail-nav__link {
    width: 100%;
    min-height: 0;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 18px;
    padding: 18px 6px;
    border-radius: 0;
    border-bottom: 1px solid rgba(237, 240, 250, 0.12);
  }

  .rail-nav__link::before {
    left: 0;
    top: auto;
    bottom: -1px;
    width: 100%;
    height: 2px;
    border-radius: 0;
    transform: translateY(0) scaleX(0);
    transform-origin: left center;
  }

  .rail-nav__link:hover { background: rgba(46, 123, 255, 0.12); }

  .rail-nav__link[aria-current="page"]::before {
    transform: translateY(0) scaleX(1);
  }

  .rail-nav__no { font-size: 13px; }

  .rail-nav__label {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    padding: 0;
    background: none;
    box-shadow: none;
    color: inherit;
    font-size: 19px;
    font-weight: 700;
    pointer-events: auto;
  }

  .rail-actions {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 131;
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    padding: 18px clamp(16px, 4vw, 24px) 22px;
    background: linear-gradient(180deg, rgba(11, 27, 58, 0) 0%, var(--ink-navy) 42%);
    opacity: 0;
    visibility: hidden;
    transition: opacity 200ms var(--ease), visibility 200ms;
  }

  .site-header[data-open="true"] .rail-actions {
    opacity: 1;
    visibility: visible;
  }

  .rail-cta {
    display: inline-flex;
    align-items: center;
    width: auto;
    height: 44px;
    padding: 0 18px;
    border-radius: var(--r-pill);
    font-size: var(--step-14);
  }

  .rail-cta__glyph { font-size: 15px; }

  .rail-cta__label {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    margin-left: 8px;
    padding: 0;
    background: none;
    box-shadow: none;
    color: inherit;
    font-size: var(--step-14);
    font-weight: 700;
    pointer-events: auto;
  }

  .rail-progress {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: auto;
    height: 2px;
  }

  .rail-progress__fill {
    transform: scaleX(var(--p, 0));
    transform-origin: left center;
  }

  body.nav-open { overflow: hidden; }

  .to-top { right: 16px; bottom: 16px; }
}

@media (max-width: 680px) {
  .grid > [class*="span-"] { grid-column: span 12; }

  .site-footer__cols {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .frame--diag { clip-path: none; }

  .lead { font-size: 18px; }
}

/* ---------- 13. 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;
    scroll-behavior: auto !important;
  }

  .card--lift:hover,
  .btn:hover,
  .rail-cta:hover,
  .rail-brand__link:hover .rail-brand__mark,
  .site-footer__mark:hover { transform: none; }
}