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

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

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

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

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

a { color: inherit; }

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

/* ================= tokens ================= */
:root {
  --c-ink: #0B2B24;
  --c-ink-2: #12181A;
  --c-ink-3: #0d3229;
  --c-gold: #E3B23C;
  --c-gold-soft: #F6DE9A;
  --c-blue: #2F9BE0;
  --c-blue-soft: #8FD0F5;
  --c-red: #B8383B;
  --c-moss: #4C6B4F;
  --c-clay: #B3663C;
  --c-rock: #39424A;
  --c-bone: #F3EFE6;
  --c-mist: #A8B0B4;

  --line: rgba(168, 176, 180, .22);
  --line-strong: rgba(168, 176, 180, .4);
  --rail-w: 252px;
  --shell-w: 1180px;

  --font-head: "Noto Sans SC", "Source Han Sans Heavy", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", system-ui, -apple-system, "Microsoft YaHei", sans-serif;
  --font-data: ui-monospace, "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --fs-display: clamp(38px, 6.4vw, 56px);
  --fs-h1: clamp(29px, 4.2vw, 36px);
  --fs-h2: clamp(22px, 2.7vw, 26px);
  --fs-h3: 20px;
  --fs-body: 17px;
  --fs-sm: 14px;
  --fs-data: 13px;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ================= base typography ================= */
body {
  background: var(--c-ink);
  color: var(--c-bone);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.16;
  color: var(--c-bone);
  text-wrap: balance;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p { text-wrap: pretty; }

strong { font-weight: 700; color: var(--c-gold-soft); }

::selection { background: var(--c-gold); color: #0B2B24; }

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

/* ================= primitives ================= */
.container {
  width: min(var(--shell-w), 100%);
  margin-inline: auto;
  padding-inline: 20px;
}

.section { padding: clamp(48px, 7vw, 96px) 0; }
.section--ink2 { background: var(--c-ink-2); }
.section--rock { background: var(--c-rock); }
.section--bone { background: var(--c-bone); color: var(--c-ink); }

.on-bone {
  background: var(--c-bone);
  color: var(--c-ink);
}
.on-bone h1, .on-bone h2, .on-bone h3, .on-bone .display,
.on-bone .section-title, .on-bone .footer-lockup { color: var(--c-ink); }
.on-bone .eyebrow { color: var(--c-clay); }
.on-bone .eyebrow::before { background: var(--c-clay); }
.on-bone .lede { color: rgba(11, 43, 36, .78); }
.on-bone .prose { color: rgba(11, 43, 36, .88); }
.on-bone .gauge-label,
.on-bone .media-cap,
.on-bone .nav-note { color: rgba(11, 43, 36, .62); }
.on-bone .cut-panel {
  border-color: rgba(11, 43, 36, .18);
  background: rgba(11, 43, 36, .035);
}
.on-bone .tag {
  background: rgba(11, 43, 36, .06);
  border-color: rgba(11, 43, 36, .18);
  color: var(--c-ink);
}
.on-bone .tag:hover { background: rgba(227, 178, 60, .3); color: var(--c-ink); }
.on-bone .media-frame { background: linear-gradient(135deg, #1b4238, #39424A); }

.display {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--fs-display);
  line-height: 1.02;
  letter-spacing: -.03em;
  margin-bottom: 18px;
}

.section-title {
  font-size: var(--fs-h2);
  margin-bottom: 14px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-data);
  font-size: var(--fs-data);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--c-gold);
  flex: 0 0 auto;
}

.lede {
  font-size: 18px;
  line-height: 1.72;
  color: rgba(243, 239, 230, .78);
  max-width: 56ch;
}

.prose {
  max-width: 68ch;
  color: rgba(243, 239, 230, .86);
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 1.9em; }
.prose h3 { margin-top: 1.6em; }
.prose a { color: var(--c-blue-soft); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--c-gold); }
.prose ul { list-style: none; }
.prose ul li { position: relative; padding-left: 20px; }
.prose ul li + li { margin-top: .5em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 9px;
  height: 2px;
  background: var(--c-gold);
}

.data-num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

/* ================= grid ================= */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}
.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-12 { grid-column: span 12; }
.offset-1 { margin-left: calc(100% / 12); }
.offset-2 { margin-left: calc(200% / 12); }
.offset-3 { margin-left: calc(300% / 12); }

/* ================= skip link ================= */
.skip-link {
  position: fixed;
  left: 12px;
  top: 12px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--c-gold);
  color: #0B2B24;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--fs-sm);
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: none; }

/* ================= buttons ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--fs-sm);
  line-height: 1.2;
  letter-spacing: .02em;
  text-decoration: none;
  cursor: pointer;
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: background-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}

.btn-gold {
  background: var(--c-gold);
  color: #0B2B24;
}
.btn-gold:hover {
  background: var(--c-gold-soft);
  transform: translateY(-2px);
}

.btn-line {
  background: transparent;
  color: var(--c-gold-soft);
  box-shadow: inset 0 0 0 1px rgba(227, 178, 60, .55);
}
.btn-line:hover {
  background: rgba(227, 178, 60, .14);
  color: var(--c-gold);
  transform: translateY(-2px);
}

.btn:active { transform: translateY(0); }

/* ================= breadcrumb ================= */
.breadcrumb {
  font-family: var(--font-data);
  font-size: var(--fs-data);
  letter-spacing: .04em;
  color: var(--c-mist);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb li + li::before {
  content: "/";
  color: rgba(168, 176, 180, .5);
}
.breadcrumb a {
  color: var(--c-blue-soft);
  text-decoration: none;
}
.breadcrumb a:hover { color: var(--c-gold); }

/* ================= header : mobile base ================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
  background: linear-gradient(120deg, #0B2B24 0%, #0d3229 68%, #123a30 100%);
  border-bottom: 1px solid var(--line);
}

.rail-brand {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  min-width: 0;
}

.rail-mark {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: var(--c-gold);
  color: #0B2B24;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: -.02em;
  clip-path: polygon(0 0, 100% 0, 100% 74%, 74% 100%, 0 100%);
}

.rail-name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -.01em;
  line-height: 1.2;
  color: var(--c-bone);
  min-width: 0;
}
.rail-name em {
  display: block;
  margin-top: 3px;
  font-style: normal;
  font-family: var(--font-data);
  font-weight: 400;
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--c-mist);
}

.nav-toggle {
  position: relative;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  color: var(--c-gold-soft);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--fs-sm);
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(227, 178, 60, .5);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}
.nav-toggle:hover { background: rgba(227, 178, 60, .16); color: var(--c-gold); }

.nav-toggle-bars {
  position: relative;
  width: 16px;
  height: 10px;
  flex: 0 0 auto;
  background:
    linear-gradient(var(--c-gold), var(--c-gold)) 0 0 / 100% 2px no-repeat,
    linear-gradient(var(--c-gold), var(--c-gold)) 0 4px / 100% 2px no-repeat,
    linear-gradient(var(--c-gold), var(--c-gold)) 0 8px / 100% 2px no-repeat;
}

.site-header[data-open] .nav-toggle-bars {
  background:
    linear-gradient(var(--c-red), var(--c-red)) 0 4px / 100% 2px no-repeat;
}

.site-nav {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  padding: 88px 20px 40px;
  background: linear-gradient(180deg, #0B2B24 0%, #0d3229 52%, #12181A 100%);
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateX(101%);
  visibility: hidden;
  transition: transform .28s var(--ease), visibility 0s linear .28s;
}

.site-header[data-open] .site-nav {
  transform: none;
  visibility: visible;
  transition: transform .28s var(--ease), visibility 0s;
}

body.is-nav-open { overflow: hidden; }

.nav-kicker {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--c-mist);
  margin-bottom: 14px;
}

.nav-list {
  display: flex;
  flex-direction: column;
}

.nav-item { border-bottom: 1px solid rgba(168, 176, 180, .14); }

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 14px;
  text-decoration: none;
  color: var(--c-bone);
  border-left: 2px solid transparent;
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.nav-link:hover {
  border-left-color: var(--c-gold);
  background: linear-gradient(90deg, rgba(227, 178, 60, .12), transparent 80%);
}

.nav-idx {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--c-mist);
  transition: color .2s var(--ease);
}

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

.nav-label {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: -.01em;
}

.nav-note {
  font-size: var(--fs-data);
  line-height: 1.6;
  color: var(--c-mist);
}

.nav-link[aria-current="page"] {
  border-left-color: var(--c-gold);
  background: linear-gradient(90deg, rgba(227, 178, 60, .18), transparent 72%);
}
.nav-link[aria-current="page"] .nav-label,
.nav-link[aria-current="page"] .nav-idx { color: var(--c-gold); }
.nav-link:hover .nav-idx { color: var(--c-gold); }

.nav-foot {
  margin-top: auto;
  padding-top: 30px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.nav-tagline {
  font-size: var(--fs-data);
  line-height: 1.7;
  color: var(--c-mist);
  max-width: 26ch;
}

.rail-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(168, 176, 180, .16);
  pointer-events: none;
}
.rail-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform-origin: left center;
  transform: scaleX(var(--progress, 0));
  background: linear-gradient(90deg, var(--c-gold), var(--c-blue));
  transition: transform .1s linear;
}

/* ================= footer : mobile base ================= */
.site-footer {
  position: relative;
  margin-top: 56px;
  background: var(--c-ink-2);
  color: var(--c-bone);
  border-top: 1px solid var(--line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(48%, 320px);
  height: 4px;
  background: linear-gradient(90deg, var(--c-gold), var(--c-clay));
}

.footer-inner {
  width: min(var(--shell-w), 100%);
  margin-inline: auto;
  padding: 48px 20px 26px;
  display: grid;
  gap: 36px;
}

.footer-lockup {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 24px;
  letter-spacing: -.02em;
  color: var(--c-bone);
}
.footer-sub {
  margin-top: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-gold);
}
.footer-tagline {
  margin-top: 14px;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--c-mist);
  max-width: 30ch;
}
.footer-brand .btn { margin-top: 20px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 28px 24px;
}

.footer-col-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--fs-data);
  letter-spacing: .16em;
  color: var(--c-gold);
  margin-bottom: 14px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  position: relative;
  display: inline-block;
  font-size: 15px;
  color: rgba(243, 239, 230, .82);
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}
.footer-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--c-gold);
  transition: width .2s var(--ease);
}
.footer-link:hover {
  color: var(--c-gold);
  padding-left: 16px;
}
.footer-link:hover::before { width: 10px; }

.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-data);
  line-height: 1.7;
  color: var(--c-mist);
}
.footer-contact { color: rgba(243, 239, 230, .74); }
.footer-legal {
  font-family: var(--font-data);
  letter-spacing: .02em;
}
.footer-note { color: rgba(168, 176, 180, .86); }
.footer-year {
  font-family: var(--font-data);
  color: rgba(168, 176, 180, .7);
}

/* ================= components ================= */
.cut-panel {
  position: relative;
  padding: 22px 22px 24px;
  background: rgba(243, 239, 230, .035);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.cut-panel--gold {
  border-color: rgba(227, 178, 60, .45);
  background: linear-gradient(158deg, rgba(227, 178, 60, .16), rgba(11, 43, 36, 0) 64%);
}
.cut-panel--gold::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 46px;
  height: 3px;
  background: var(--c-gold);
}

.track-band {
  position: relative;
  padding-left: 26px;
}
.track-band::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-gold), rgba(47, 155, 224, .28));
}

.gauge {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.gauge-value {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(28px, 4.6vw, 44px);
  line-height: 1;
  color: var(--c-gold);
}
.gauge-label {
  font-size: var(--fs-data);
  letter-spacing: .06em;
  color: var(--c-mist);
}

.seg {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  background: rgba(57, 66, 74, .42);
  border: 1px solid var(--line);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}
.seg-btn {
  padding: 9px 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--fs-sm);
  letter-spacing: .02em;
  color: var(--c-mist);
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.seg-btn:hover { color: var(--c-bone); background: rgba(243, 239, 230, .07); }
.seg-btn[aria-selected="true"] {
  background: var(--c-gold);
  color: #0B2B24;
}

.seg-panel-wrap { margin-top: 22px; }
.seg-panel[hidden] { display: none; }

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-family: var(--font-data);
  font-size: var(--fs-data);
  letter-spacing: .04em;
  color: var(--c-bone);
  text-decoration: none;
  background: rgba(57, 66, 74, .45);
  border: 1px solid var(--line);
  transition: transform .2s var(--ease), background-color .2s var(--ease), color .2s var(--ease);
}
.tag:hover {
  transform: scale(1.04);
  background: rgba(227, 178, 60, .22);
  color: var(--c-gold-soft);
}

.media-frame {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  background: linear-gradient(135deg, #0e2f27, #12181A);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(135deg, rgba(227, 178, 60, .1) 0 12px, rgba(47, 155, 224, .06) 12px 24px);
}
.media-cap {
  margin-top: 10px;
  font-family: var(--font-data);
  font-size: var(--fs-data);
  letter-spacing: .02em;
  color: var(--c-mist);
}

/* ================= reveal ================= */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .6s var(--ease), transform .6s var(--ease);
  }
  .reveal.is-in {
    opacity: 1;
    transform: none;
  }
  .seg-panel:not([hidden]) { animation: seg-in .2s var(--ease) both; }
}

@keyframes seg-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* ================= tablet / desktop ================= */
@media (min-width: 760px) {
  .container { padding-inline: 32px; }
  .footer-inner {
    grid-template-columns: minmax(220px, 1fr) minmax(0, 1.7fr);
    gap: 44px 52px;
    padding: 64px 32px 28px;
  }
  .footer-meta { grid-column: 1 / -1; }
}

@media (max-width: 1079px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-12 { grid-column: span 6; }
  .offset-1, .offset-2, .offset-3 { margin-left: 0; }
}

@media (max-width: 640px) {
  .grid-12 { grid-template-columns: 1fr; gap: 18px; }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-12 { grid-column: span 1; }
  .rail-name em { display: none; }
}

@media (min-width: 1080px) {
  body { padding-left: var(--rail-w); }

  .site-header {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: var(--rail-w);
    height: auto;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 30px 24px 32px;
    border-bottom: 0;
    border-right: 1px solid var(--line);
    background: linear-gradient(172deg, #0d3229 0%, #0B2B24 58%, #0a231e 100%);
    overflow-x: hidden;
    overflow-y: auto;
  }

  .site-header::before {
    content: "";
    position: absolute;
    top: -40px;
    right: -46px;
    width: 150px;
    height: 210px;
    background: linear-gradient(140deg, rgba(227, 178, 60, .22), rgba(227, 178, 60, 0) 72%);
    transform: rotate(12deg);
    pointer-events: none;
  }

  .site-header::after {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 5px;
    height: 176px;
    background: linear-gradient(180deg, var(--c-gold), rgba(227, 178, 60, 0));
    pointer-events: none;
  }

  .rail-brand { gap: 12px; }
  .rail-mark { width: 44px; height: 44px; font-size: 17px; }
  .rail-name { font-size: 19px; }
  .rail-name em { font-size: 11px; }

  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    inset: auto;
    z-index: 2;
    margin-top: 36px;
    padding: 0;
    background: none;
    overflow: visible;
    transform: none;
    visibility: visible;
    transition: none;
    flex: 1;
  }

  .nav-kicker { display: none; }
  .nav-note { display: none; }
  .nav-item { border-bottom: 0; }

  .nav-link {
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
  }
  .nav-label { font-size: 16px; }

  .nav-foot { margin-top: auto; }

  .rail-progress {
    left: auto;
    top: 0;
    right: 0;
    bottom: 0;
    width: 3px;
    height: auto;
  }
  .rail-progress-bar {
    transform-origin: center top;
    transform: scaleY(var(--progress, 0));
    background: linear-gradient(180deg, var(--c-gold), var(--c-blue));
  }
}

/* ================= reduced motion ================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .rail-progress-bar { transition: none; }
}