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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ol, ul { margin: 0; }
ul, ol { padding: 0; }
img, picture, video, svg { max-width: 100%; }
img { height: auto; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
hr { border: 0; border-top: 1px solid var(--line); }

:root {
  --ink-navy: #0B1A2B;
  --ink-navy-deep: #0A1524;
  --char-black: #121417;
  --deep-green: #0E2B29;
  --indigo: #191A3A;
  --wine: #6B1F33;
  --whistle: #FF6A1F;
  --whistle-soft: #FF8345;
  --cyan: #35E6D2;
  --amber: #F5B544;
  --ivory: #F4F1EA;
  --mist: #9AA6B2;
  --line: #2A3A4A;
  --line-soft: rgba(154, 166, 178, .18);

  --font-display: "Oswald", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-editorial: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "Times New Roman", Georgia, serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --gutter: clamp(18px, 4.5vw, 60px);
  --page-max: 1320px;
  --radius: 2px;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

body {
  min-height: 100vh;
  background-color: var(--ink-navy);
  color: var(--ivory);
  font-family: var(--font-body);
  font-size: clamp(1rem, .95rem + .2vw, 1.0625rem);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { color: var(--ivory); }
h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(2.4rem, 6vw, 5rem);
  line-height: 1.02;
  letter-spacing: -.01em;
}
h2 {
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(1.5rem, 2.6vw, 2.25rem);
  line-height: 1.25;
  letter-spacing: .01em;
}
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 1.2vw, 1.3rem);
  line-height: 1.3;
  letter-spacing: .01em;
}
p { text-wrap: pretty; }
strong { font-weight: 700; color: var(--ivory); }
code, kbd, samp { font-family: var(--font-mono); font-size: .92em; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: 10px;
  z-index: 200;
  padding: 10px 16px;
  background-color: var(--amber);
  color: #16120A;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: .92rem;
  text-decoration: none;
  border-radius: var(--radius);
  transform: translateY(-220%);
  transition: transform .18s var(--ease);
}
.skip-link:focus-visible { transform: translateY(0); }

.shell {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 100px); }
.zone { padding-block: clamp(44px, 6.5vw, 92px); }
.zone--green { background-color: var(--deep-green); }
.zone--indigo { background-color: var(--indigo); }
.zone--wine { background-color: var(--wine); }
.zone--char { background-color: var(--char-black); }
.zone--line { border-block: 1px solid var(--line); }

.stack { display: grid; gap: clamp(14px, 1.8vw, 22px); align-content: start; }
.stack--tight { gap: 10px; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px; }

.grid { display: grid; gap: clamp(18px, 2.6vw, 36px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.rail-layout {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: start;
}

@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rail-layout { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 620px) {
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
}

.btn {
  --btn-bg: transparent;
  --btn-fg: var(--ivory);
  --btn-bd: var(--line);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  font-family: var(--font-display);
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  background-color: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  border-radius: var(--radius);
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn--whistle { --btn-bg: var(--whistle); --btn-fg: #14100C; --btn-bd: var(--whistle); }
.btn--whistle:hover { --btn-bg: var(--whistle-soft); --btn-bd: var(--whistle-soft); }
.btn--ghost { --btn-bd: rgba(53, 230, 210, .45); }
.btn--ghost:hover { --btn-bd: var(--cyan); --btn-fg: var(--cyan); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before { content: ""; width: 20px; height: 1px; background-color: currentColor; }
.eyebrow--amber { color: var(--amber); }
.eyebrow--whistle { color: var(--whistle); }

.coord {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--mist);
}
.coord--cyan { color: var(--cyan); }
.coord--amber { color: var(--amber); }

.marker-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--whistle);
}
.marker-dot--cyan { background-color: var(--cyan); }
.marker-dot--amber { background-color: var(--amber); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--mist);
}
.badge--live { border-color: rgba(255, 106, 31, .6); color: var(--whistle); }
.badge--ok { border-color: rgba(245, 181, 68, .55); color: var(--amber); }

.panel {
  position: relative;
  background-color: var(--char-black);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(18px, 2.4vw, 30px);
}
.panel--green { background-color: rgba(14, 43, 41, .78); }
.panel--indigo { background-color: rgba(25, 26, 58, .8); }
.panel--wine { background-color: rgba(107, 31, 51, .55); }
.panel--ghost { background-color: transparent; }
.panel--grid {
  background-image:
    linear-gradient(to right, rgba(154, 166, 178, .06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(154, 166, 178, .06) 1px, transparent 1px);
  background-size: 26px 26px;
  background-position: -1px -1px;
}

.prose { max-width: 68ch; }
.prose > * + * { margin-top: 1em; }
.prose h2 { margin-top: 1.9em; }
.prose h3 { margin-top: 1.6em; color: var(--amber); }
.prose ul, .prose ol { padding-left: 1.25em; }
.prose li + li { margin-top: .35em; }
.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.prose a:hover { color: var(--amber); }
.prose blockquote {
  margin: 1.6em 0;
  padding-left: 18px;
  border-left: 2px solid var(--whistle);
  font-family: var(--font-editorial);
  font-size: 1.08em;
  color: var(--ivory);
}
.prose code {
  padding: 2px 6px;
  background-color: rgba(53, 230, 210, .08);
  border-radius: var(--radius);
  color: var(--cyan);
}

.crumbs { padding-block: clamp(16px, 2vw, 26px) 0; }
.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
}
.crumbs li { display: inline-flex; align-items: center; gap: 8px; }
.crumbs li + li::before { content: "/"; color: rgba(154, 166, 178, .5); }
.crumbs a { color: var(--mist); text-decoration: none; transition: color .18s var(--ease); }
.crumbs a:hover { color: var(--cyan); }
.crumbs [aria-current="page"] { color: var(--amber); }

.media {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: #0D1626;
}
.media > img,
.media > picture,
.media > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }
.media--hero { aspect-ratio: 16 / 9; border-color: rgba(53, 230, 210, .3); }
.media__veil {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 16% 84%, rgba(255, 106, 31, .24), transparent 44%),
    radial-gradient(circle at 84% 14%, rgba(53, 230, 210, .2), transparent 46%);
}
.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--ivory);
  background-color: rgba(11, 26, 43, .84);
  border-top: 1px solid var(--line);
}

.rail { position: sticky; top: 96px; align-self: start; }
.rail ol { display: grid; gap: 14px; list-style: none; margin: 0; padding: 0; }
.rail a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding-left: 12px;
  border-left: 1px solid var(--line);
  color: var(--mist);
  font-size: .88rem;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.rail a:hover { color: var(--ivory); border-left-color: var(--cyan); }
.rail a[aria-current] { color: var(--ivory); border-left-color: var(--whistle); }
.rail a[aria-current] .rail__num { color: var(--whistle); }
.rail__num {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}
@media (max-width: 900px) { .rail { position: static; } }

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--ink-navy);
  background-image: radial-gradient(ellipse 40% 170% at 92% -50%, rgba(53, 230, 210, .12), transparent 70%);
  border-bottom: 1px solid var(--line);
  transition: background-color .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.site-header[data-stuck] {
  background-color: var(--ink-navy-deep);
  border-bottom-color: rgba(53, 230, 210, .38);
  box-shadow: 0 1px 0 rgba(53, 230, 210, .12);
}

.header-shell {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
  padding-block: clamp(12px, 1.8vw, 20px);
  transition: padding-block .2s var(--ease);
}
.site-header[data-stuck] .header-shell { padding-block: 8px; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding-block: 2px;
  color: var(--ivory);
  text-decoration: none;
}
.brand-mark {
  position: relative;
  flex: none;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(53, 230, 210, .55);
  border-radius: 50%;
  background-image: radial-gradient(circle at 50% 50%, rgba(53, 230, 210, .16), transparent 68%);
}
.brand-mark::before {
  content: "";
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--whistle);
}
.brand-mark::after {
  content: "";
  position: absolute;
  right: -7px;
  top: 50%;
  width: 12px;
  height: 2px;
  background-color: var(--cyan);
  transform: translateY(-50%) rotate(18deg);
}
.brand-text { display: grid; gap: 1px; line-height: 1.15; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: 1.12rem;
  letter-spacing: .06em;
  color: var(--ivory);
}
.brand-tag {
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .16em;
  color: var(--mist);
}

.site-nav { justify-self: end; }
.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(12px, 1.7vw, 26px);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list a {
  position: relative;
  display: inline-block;
  padding: 6px 0;
  font-size: .94rem;
  letter-spacing: .04em;
  color: var(--ivory);
  text-decoration: none;
  transition: color .18s var(--ease);
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background-color: var(--whistle);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .2s var(--ease), background-color .2s var(--ease);
}
.nav-list a:hover { color: var(--whistle); }
.nav-list a:hover::after { transform: scaleX(1); }
.nav-list a[aria-current="page"] { color: var(--cyan); }
.nav-list a[aria-current="page"]::after { transform: scaleX(1); background-color: var(--cyan); }

.header-cta { padding: 9px 18px; font-size: .85rem; letter-spacing: .08em; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  background-color: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ivory);
  cursor: pointer;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  transition: background-color .18s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  transition: transform .2s var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background-color: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  pointer-events: none;
  background-image: linear-gradient(90deg, var(--whistle), var(--amber));
  transition: width .12s linear;
}

@media (max-width: 1000px) {
  .header-shell { grid-template-columns: minmax(0, 1fr) auto; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; justify-self: end; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 2;
    background-color: var(--ink-navy-deep);
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height .26s var(--ease), visibility .26s linear;
  }
  .site-nav[data-open] {
    max-height: min(72vh, 560px);
    overflow-y: auto;
    visibility: visible;
    box-shadow: 0 18px 30px -24px rgba(0, 0, 0, .9);
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px var(--gutter) 20px;
  }
  .nav-list li + li { border-top: 1px solid rgba(42, 58, 74, .8); }
  .nav-list a { display: block; padding: 15px 4px; font-size: 1rem; }
  .nav-list a::after { display: none; }
  .nav-list a[aria-current="page"] {
    padding-left: 14px;
    background-color: rgba(53, 230, 210, .06);
    box-shadow: inset 2px 0 0 var(--cyan);
  }
}

.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 112px);
  background-color: var(--char-black);
  color: var(--ivory);
  border-top: 1px solid var(--line);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: -1px;
  height: 1px;
  background-image: linear-gradient(90deg, var(--cyan) 0%, rgba(53, 230, 210, .25) 34%, rgba(42, 58, 74, 0) 82%);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.9fr);
  gap: clamp(28px, 4vw, 64px);
  padding-block: clamp(36px, 5vw, 64px) clamp(24px, 3vw, 40px);
}
.footer-brand { display: grid; gap: 10px; align-content: start; }
.footer-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  letter-spacing: .06em;
}
.footer-tag {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--cyan);
}
.footer-note {
  max-width: 34ch;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--mist);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 36px);
}
.footer-col h2 {
  margin: 0 0 14px;
  font-family: var(--font-editorial);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ivory);
}
.footer-col h2::before {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  margin-bottom: 10px;
  background-color: var(--amber);
}
.footer-col ul { display: grid; gap: 9px; list-style: none; margin: 0; padding: 0; }
.footer-col a {
  font-size: .9rem;
  color: var(--mist);
  text-decoration: none;
  transition: color .18s var(--ease);
}
.footer-col a:hover { color: var(--cyan); }
.footer-plain {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--mist);
}

.footer-contact {
  display: grid;
  gap: 8px;
  padding-block: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .03em;
  line-height: 1.8;
  color: var(--mist);
}
.footer-service { color: var(--mist); }
.footer-address { color: rgba(154, 166, 178, .8); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 28px;
  padding-block: 16px 28px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .05em;
  color: rgba(154, 166, 178, .85);
}
.footer-copy, .footer-icp { color: var(--mist); }
.footer-legal-note { color: rgba(154, 166, 178, .7); }

.whistle-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 95;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  background-color: #101C2C;
  color: var(--cyan);
  border: 1px solid rgba(53, 230, 210, .55);
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s linear, border-color .2s var(--ease);
}
.whistle-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.whistle-top:hover { border-color: var(--whistle); color: var(--whistle); }
.whistle-top__arrow {
  width: 11px;
  height: 11px;
  border-left: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: rotate(45deg);
}
.whistle-top[data-ring] { animation: whistle-swing .5s var(--ease) 1; }

@keyframes whistle-swing {
  0% { transform: rotate(0deg); }
  40% { transform: rotate(-9deg); }
  72% { transform: rotate(7deg); }
  100% { transform: rotate(0deg); }
}

@media (max-width: 900px) {
  .footer-main { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 520px) {
  .footer-legal { flex-direction: column; align-items: flex-start; }
  .footer-note { max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}