:root {
  --color-surface: #fefefe;
  --color-surface-alt: #f5f5f5;
  --color-surface-deep: #e7e9e9;
  --color-ink: #424d4c;
  --color-ink-soft: #647271;
  --color-ink-muted: #788786;
  --color-line: #dcdede;
  --color-primary: #12827b;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #ddedec;
  --color-accent: #ea1520;
  --color-accent-ink: #ffffff;
  --color-highlight: #fad4d6;
  --color-focus: #e80713;
  --color-contrast-surface: #162d2b;
  --color-contrast-ink: #e4e7e7;
  --color-contrast-line: #435654;
  --color-contrast-accent: #f16067;
  --overlay-scrim: linear-gradient(180deg, rgba(22, 45, 43, 0.35) 0%, rgba(22, 45, 43, 0.72) 55%, rgba(22, 45, 43, 0.92) 100%);
  --font-heading: ui-monospace, SFMono-Regular, Menlo, Consolas, "PingFang SC", monospace;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 10.7px;
  --text-sm: 13.4px;
  --text-base: 15px;
  --text-lg: 18.8px;
  --text-xl: 23.4px;
  --text-2xl: 29.3px;
  --text-3xl: 36.6px;
  --text-4xl: 45.8px;
  --text-display: clamp(51px, 10.4vw, 133px);
  --text-figure: clamp(42px, 7.5vw, 96px);
  --weight-heading: 674;
  --weight-body: 400;
  --leading-body: 1.71;
  --leading-heading: 1.25;
  --tracking-heading: 0.001em;
  --radius-sm: 32px;
  --radius-md: 52px;
  --radius-lg: 71px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 0 0 1px rgba(234, 21, 32, 0.35);
  --shadow-2: 0 0 28px rgba(234, 21, 32, 0.35);
  --space-1: 7px;
  --space-2: 14px;
  --space-3: 21px;
  --space-4: 28px;
  --space-6: 42px;
  --space-8: 56px;
  --container: 1200px;
  --measure: 69ch;
  --gutter: 28px;
  --section-y: 88px;
  --section-y-lg: 123px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  letter-spacing: 0.012em;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, hr { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video, picture { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { padding: 0; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { width: 100%; border-collapse: collapse; }
hr { border: 0; }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ===== layout ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background-color: var(--color-surface-alt); }
.section--deep {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: flex-start;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.kicker::before {
  content: "";
  width: 24px;
  height: 2px;
  background-color: currentColor;
  flex: none;
}

.section-index {
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

h1, .h1 {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

h2, .h2 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

h3, .h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.display-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.94;
  letter-spacing: -0.015em;
  color: var(--color-ink);
  margin: 0;
}

.lede {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-3); }
.prose h2 { margin-top: var(--space-6); }
.prose h3 { margin-top: var(--space-4); }
.prose strong { font-weight: var(--weight-heading); color: var(--color-ink); }
.prose ul,
.prose ol { padding-inline-start: 1.3em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: var(--space-1); }

/* ===== skip link ===== */
.skip-link {
  position: absolute;
  top: -120px;
  left: var(--space-4);
  z-index: 200;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  transition: top 0.18s ease;
}
.skip-link:focus { top: var(--space-2); }

/* ===== header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: color-mix(in srgb, var(--color-surface) 94%, transparent);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: box-shadow 0.24s ease;
}

body.is-scrolled .site-header {
  box-shadow: 0 20px 44px color-mix(in srgb, var(--color-contrast-surface) 16%, transparent);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: 78px;
}

.brand-lockup {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  padding-block: var(--space-2);
  flex: none;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.16em;
  color: var(--color-primary);
  line-height: 1.1;
}

.brand-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
  text-transform: uppercase;
}

.site-nav { margin-inline-start: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid transparent;
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  color: var(--color-ink-soft);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.nav-link::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
  opacity: 0.4;
  flex: none;
  transition: opacity 0.2s ease, background-color 0.2s ease;
}
.nav-link:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}
.nav-link:hover::before { opacity: 1; }
.nav-link[aria-current="page"] {
  background-color: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 78%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
}
.nav-link[aria-current="page"]::before {
  background-color: var(--color-accent);
  opacity: 1;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  margin-inline-start: auto;
  padding: 8px 18px 8px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.nav-toggle:hover { background-color: var(--color-primary-soft); }
.nav-toggle-glyph {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
  flex: none;
}
.nav-toggle-glyph i {
  display: block;
  height: 2px;
  width: 16px;
  border-radius: 2px;
  background-color: currentColor;
  transition: width 0.2s ease, background-color 0.2s ease;
}
.nav-toggle-glyph i:last-child {
  width: 10px;
  background-color: var(--color-accent);
}
.nav-toggle[aria-expanded="true"] {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-glyph i:last-child { width: 16px; }

.status-bar {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.status-inner {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 34px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-contrast-accent);
  box-shadow: var(--shadow-2);
  flex: none;
  animation: led-pulse 1.2s ease-in-out infinite;
}

.status-text { color: var(--color-contrast-ink); }

.status-code {
  margin-inline-start: auto;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* ===== footer ===== */
.site-footer {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: 4px double var(--color-contrast-line);
  padding-block: var(--section-y) var(--space-6);
}

.footer-display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.86;
  letter-spacing: 0.01em;
  color: var(--color-contrast-ink);
  word-break: break-all;
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .footer-display {
    background-image: linear-gradient(
      98deg,
      var(--color-contrast-ink) 0%,
      color-mix(in srgb, var(--color-contrast-ink) 52%, var(--color-primary)) 58%,
      var(--color-contrast-accent) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
  }
}

.footer-tagline {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.22em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

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

.footer-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
  margin-bottom: var(--space-3);
}

.footer-list li + li { margin-top: var(--space-2); }
.footer-list a,
.footer-list span {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}
.footer-list a {
  border-bottom: var(--border-thin) dotted transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.footer-list a:hover {
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-line);
}

.footer-facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.fact-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 50%, transparent);
}
.fact-val { color: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent); }

.footer-contact span {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}
.footer-address { display: block; }

.footer-legal {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: var(--border-thin) dotted var(--color-contrast-line);
}

.footer-note {
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: 1.8;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.footer-icp {
  margin-top: var(--space-4);
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: color-mix(in srgb, var(--color-contrast-ink) 54%, transparent);
}

/* ===== buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 13px 30px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}
.btn--primary:hover { box-shadow: var(--shadow-2); }
.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn--ghost {
  background-color: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}
.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}
.btn--on-dark {
  background-color: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.btn--on-dark:hover {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent);
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
}

/* ===== pills ===== */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 15px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  line-height: 1.6;
  white-space: nowrap;
}
.pill--accent {
  background-color: var(--color-highlight);
  color: var(--color-accent);
}
.pill--quiet {
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
}
.pill--dark {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 14%, transparent);
  color: var(--color-contrast-ink);
}
.pill--button {
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}
.pill--button:hover { background-color: color-mix(in srgb, var(--color-primary) 22%, var(--color-primary-soft)); }
.pill--button[aria-pressed="true"] {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

/* ===== panels ===== */
.panel {
  position: relative;
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
}
.panel--alt { background-color: var(--color-surface-alt); }
.panel--deep {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.panel--gloss { overflow: hidden; }
.panel--gloss::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
    115deg,
    transparent 42%,
    color-mix(in srgb, var(--color-primary-ink) 16%, transparent) 50%,
    transparent 58%
  );
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.24s ease;
}
.panel--gloss:hover::after { opacity: 1; }

/* ===== status lights ===== */
.led {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-primary);
  flex: none;
}
.led--accent {
  background-color: var(--color-accent);
  box-shadow: var(--shadow-1);
}
.led--quiet { background-color: var(--color-line); }
.led--on-dark { background-color: var(--color-contrast-accent); }
.led--live { animation: led-pulse 1.2s ease-in-out infinite; }

@keyframes led-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}

/* ===== data ===== */
.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.stat-figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.data-list { display: flex; flex-direction: column; }
.data-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-2);
  border-bottom: var(--border-thin) dotted var(--color-line);
}
.data-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}
.data-value {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}
.panel--deep .data-row { border-bottom-color: var(--color-contrast-line); }
.panel--deep .data-key { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }
.panel--deep .data-value { color: var(--color-contrast-ink); }

/* ===== timeline ===== */
.timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(150px, 1fr);
  gap: var(--space-2);
  overflow-x: auto;
  padding-bottom: var(--space-3);
  scrollbar-width: thin;
}
.timeline-node {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  text-align: start;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}
.timeline-node:hover { border-color: var(--color-primary); }
.timeline-node[aria-current="true"] {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.timeline-day {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
}
.timeline-meta {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.timeline-node[aria-current="true"] .timeline-meta {
  color: color-mix(in srgb, var(--color-primary-ink) 78%, transparent);
}

/* ===== disclosure ===== */
.disclosure {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  overflow: hidden;
}
.disclosure + .disclosure { margin-top: var(--space-2); }
.disclosure-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-surface-deep);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  text-align: start;
  color: var(--color-ink);
  transition: background-color 0.2s ease, color 0.2s ease;
}
.disclosure-trigger::after {
  content: "＋";
  margin-inline-start: auto;
  font-family: var(--font-mono);
  color: var(--color-primary);
}
.disclosure-trigger:hover { background-color: var(--color-primary-soft); }
.disclosure-trigger[aria-expanded="true"] {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}
.disclosure-trigger[aria-expanded="true"]::after { content: "－"; }
.disclosure-body { padding: var(--space-4); }
.disclosure-body[hidden] { display: none; }

/* ===== media ===== */
.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: 220px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-contrast-surface);
}
.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: var(--space-1);
  padding: var(--space-4);
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
}
.media-caption {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

/* ===== rules ===== */
.rule {
  border: 0;
  border-top: var(--border-thin) solid var(--color-line);
  width: 100%;
}
.rule--double { border-top: 3px double var(--color-line); }
.rule--dotted { border-top-style: dotted; }
.rule--deep { border-top-color: var(--color-contrast-line); }

/* ===== breadcrumb ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}
.breadcrumb li { display: inline-flex; align-items: center; gap: var(--space-1); }
.breadcrumb li:not(:last-child)::after {
  content: "/";
  color: var(--color-line);
}
.breadcrumb a:hover { color: var(--color-primary); }

/* ===== scroll progress ===== */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  z-index: 200;
  pointer-events: none;
}

/* ===== reveal ===== */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.42s ease, transform 0.42s ease;
}
.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ===== responsive ===== */
@media (max-width: 1080px) {
  .header-inner { gap: var(--space-3); }
  .nav-link { padding: 9px 14px; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4) var(--space-6); }
}

@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    display: none;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    background-color: var(--color-surface);
    border-bottom: var(--border-thin) solid var(--color-line);
    box-shadow: 0 32px 64px color-mix(in srgb, var(--color-contrast-surface) 24%, transparent);
  }
  .site-nav[data-open] { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    padding: var(--space-3) var(--gutter) var(--space-4);
  }
  .nav-link {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
  }
  .nav-link[aria-current="page"] { border-radius: var(--radius-sm); }

  .grid-12 { gap: var(--space-3); }
}

@media (max-width: 720px) {
  .header-inner { min-height: 66px; gap: var(--space-2); }
  .brand-name { font-size: var(--text-base); letter-spacing: 0.1em; }
  .status-code { display: none; }
  .status-inner { min-height: 30px; letter-spacing: 0.1em; }

  .section { padding-block: var(--space-8); }
  .section--lg { padding-block: var(--section-y); }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-tagline { letter-spacing: 0.14em; }
  .panel { padding: var(--space-3); }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .btn { padding: 12px 22px; }
  .footer-display { word-break: break-all; }
}

@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;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress { transition: none; }
}