/* ==========================================================================
   BSPORT赛场 — 共享站点样式 / assets/site.css
   深墨绿赛场 · 荧光青绿信号 · 等宽索引 · 看台阶梯
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 132px;
  scroll-behavior: smooth;
}

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

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

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

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; text-decoration: none; }

hr { border: 0; }

/* ---------- 2. Tokens ---------- */
:root {
  --c-ink: #0C2B24;
  --c-night: #061512;
  --c-neon: #35F0A4;
  --c-amber: #F2A33A;
  --c-cream: #F5F0E6;
  --c-rock: #6E7A72;
  --c-moss: #4D6B58;
  --c-clay: #B36A4C;
  --c-mist: #CFE6DB;
  --c-black: #04100D;

  --line-dark: rgba(207, 230, 219, 0.14);
  --line-light: rgba(4, 16, 13, 0.14);
  --text-dim: rgba(207, 230, 219, 0.64);
  --text-faint: rgba(207, 230, 219, 0.4);

  --font-display: "Noto Sans SC Condensed", "Source Han Sans CN",
    "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo,
    Consolas, "Courier New", monospace;

  --wrap: 1200px;
  --gutter: 20px;
  --gap: clamp(16px, 2.2vw, 28px);
  --pad-section: clamp(56px, 7.5vw, 104px);

  --cut: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  --cut-lg: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

/* ---------- 3. Base ---------- */
body {
  background: var(--c-ink);
  color: var(--c-cream);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (min-width: 920px) {
  body { font-size: 17px; }
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 87.5%;
  line-height: 1.14;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

::selection {
  background: var(--c-neon);
  color: var(--c-night);
}

/* ---------- 4. Layout utilities ---------- */
.wrap {
  width: min(var(--wrap), 100% - (var(--gutter) * 2));
  margin-inline: auto;
}

.wrap--narrow { width: min(780px, 100% - (var(--gutter) * 2)); margin-inline: auto; }
.wrap--wide { width: min(1400px, 100% - (var(--gutter) * 2)); margin-inline: auto; }

.section { padding-block: var(--pad-section); }

.section--light {
  background: var(--c-cream);
  color: var(--c-black);
  --text-dim: rgba(4, 16, 13, 0.66);
  --text-faint: rgba(4, 16, 13, 0.42);
  --line-dark: rgba(4, 16, 13, 0.14);
}

.section--night { background: var(--c-night); color: var(--c-cream); }

.section--moss { background: var(--c-moss); color: var(--c-cream); }

.grid { display: grid; gap: var(--gap); }
.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--8-4 { grid-template-columns: 8fr 4fr; }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (max-width: 900px) {
  .grid--7-5,
  .grid--8-4,
  .grid--halves,
  .grid--thirds { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 5. Type helpers ---------- */
.display-1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 87.5%;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.015em;
}

.display-2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 87.5%;
  font-size: clamp(26px, 3.8vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.012em;
}

.display-3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 32px);
  line-height: 1.2;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-neon);
  margin-bottom: 12px;
}

.lede {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 62ch;
}

.mono { font-family: var(--font-mono); letter-spacing: 0.08em; }

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

.rule { height: 1px; background: var(--line-dark); border: 0; margin: 0; }

.prose { max-width: 70ch; }
.prose p { margin-bottom: 1.1em; }
.prose p:last-child { margin-bottom: 0; }
.prose h2 { font-size: clamp(20px, 2.2vw, 28px); margin: 1.6em 0 0.6em; }
.prose h3 { font-size: clamp(17px, 1.8vw, 22px); margin: 1.4em 0 0.5em; }
.prose ul { list-style: none; margin: 0 0 1.1em; padding: 0; }
.prose li { position: relative; padding-left: 20px; margin-bottom: 0.5em; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.72em;
  width: 8px; height: 2px;
  background: var(--c-amber);
}

.note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
  border-left: 2px solid var(--c-amber);
  padding-left: 14px;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-neon);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.link-arrow::after { content: "→"; transition: transform 0.2s ease; }
.link-arrow:hover { border-bottom-color: currentColor; }
.link-arrow:hover::after { transform: translateX(3px); }

.page-head { padding-block: clamp(32px, 4.5vw, 60px) clamp(20px, 3vw, 36px); }

/* ---------- 6. Buttons ---------- */
.btn {
  position: relative;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  line-height: 1;
  color: var(--c-night);
  background: none;
  border: 0;
  cursor: pointer;
  transition: color 0.2s ease;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--c-neon);
  clip-path: var(--cut);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover::before { background: var(--c-cream); }

.btn--accent { color: var(--c-night); }

.btn--ghost { color: var(--c-cream); }
.btn--ghost::before {
  background: transparent;
  box-shadow: inset 0 0 0 1px rgba(207, 230, 219, 0.38);
}
.btn--ghost:hover { color: var(--c-night); }
.btn--ghost:hover::before { background: var(--c-neon); box-shadow: none; }

.btn--amber { color: var(--c-night); }
.btn--amber::before { background: var(--c-amber); }
.btn--amber:hover::before { background: var(--c-cream); }

.btn:focus-visible { outline: 2px solid var(--c-cream); outline-offset: 4px; }
.btn--ghost:focus-visible { outline-color: var(--c-neon); }

/* ---------- 7. Tags / status ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-mist);
  border: 1px solid rgba(207, 230, 219, 0.26);
  border-radius: 1px;
}

.tag--neon { color: var(--c-neon); border-color: rgba(53, 240, 164, 0.5); background: rgba(53, 240, 164, 0.08); }
.tag--amber { color: var(--c-amber); border-color: rgba(242, 163, 58, 0.5); background: rgba(242, 163, 58, 0.1); }
.tag--clay { color: var(--c-clay); border-color: rgba(179, 106, 76, 0.55); background: rgba(179, 106, 76, 0.12); }

.status-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--c-neon);
  box-shadow: 0 0 0 3px rgba(53, 240, 164, 0.16);
  flex: none;
}
.status-dot--amber { background: var(--c-amber); box-shadow: 0 0 0 3px rgba(242, 163, 58, 0.16); }

/* ---------- 8. Panels ---------- */
.panel {
  padding: clamp(18px, 2.4vw, 32px);
  background: rgba(77, 107, 88, 0.16);
  border: 1px solid var(--line-dark);
  border-radius: 1px;
}

.panel--cut { clip-path: var(--cut-lg); border: 0; }

.panel--light {
  background: var(--c-mist);
  color: var(--c-black);
  border-color: rgba(4, 16, 13, 0.12);
}

/* ---------- 9. Breadcrumb ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-faint);
}

.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }

.breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb li::after { content: "／"; color: var(--text-faint); }
.breadcrumb li:last-child::after { content: ""; }

.breadcrumb a {
  color: var(--c-mist);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.breadcrumb a:hover { color: var(--c-neon); border-bottom-color: currentColor; }
.breadcrumb [aria-current="page"] { color: var(--c-cream); }

.breadcrumb--ink { color: rgba(4, 16, 13, 0.5); }
.breadcrumb--ink a { color: var(--c-ink); }
.breadcrumb--ink a:hover { color: var(--c-clay); }
.breadcrumb--ink [aria-current="page"] { color: var(--c-black); }

/* ---------- 10. Media shells（页面阶段放图用） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: 1px;
  background:
    repeating-linear-gradient(135deg, rgba(207, 230, 219, 0.05) 0 10px, transparent 10px 20px),
    linear-gradient(160deg, var(--c-moss) 0%, var(--c-ink) 46%, var(--c-night) 100%);
}

.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--band { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.media__frame { clip-path: var(--cut-lg); border: 0; }

.media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

/* ---------- 11. Skip link / progress ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--c-neon);
  color: var(--c-night);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  transition: top 0.18s ease;
}
.skip-link:focus { top: 12px; }

.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 120;
  background: linear-gradient(90deg, var(--c-neon) 0%, var(--c-amber) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------- 12. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background:
    linear-gradient(180deg, rgba(53, 240, 164, 0.07), rgba(53, 240, 164, 0) 46%),
    var(--c-ink);
  border-bottom: 1px solid var(--line-dark);
}

.header-strip {
  background: var(--c-night);
  border-bottom: 1px solid rgba(207, 230, 219, 0.08);
}

.header-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 32px;
  padding-block: 6px;
}

.strip-meta {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.strip-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-neon);
  box-shadow: 0 0 0 3px rgba(53, 240, 164, 0.16);
  flex: none;
}

@media (prefers-reduced-motion: no-preference) {
  .strip-dot { animation: stripPulse 2.6s ease-in-out infinite; }
}

@keyframes stripPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 3px rgba(53, 240, 164, 0.16); }
  50% { opacity: 0.55; box-shadow: 0 0 0 6px rgba(53, 240, 164, 0.04); }
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding-block: 18px 14px;
}

.masthead__edge {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-faint);
  white-space: nowrap;
}

.masthead__brand {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: var(--c-cream);
}

.masthead__brand-name {
  display: inline-flex;
  align-items: baseline;
  gap: 0.1em;
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 87.5%;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1;
  letter-spacing: 0.01em;
}

.masthead__brand-cn {
  color: var(--c-neon);
  font-size: 0.76em;
  letter-spacing: 0.08em;
  transition: color 0.2s ease;
}

.masthead__brand:hover .masthead__brand-cn { color: var(--c-cream); }

.masthead__brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.masthead__actions {
  grid-column: 3;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.masthead__cta { padding: 11px 16px; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 11px;
  background: transparent;
  color: var(--c-mist);
  border: 1px solid rgba(207, 230, 219, 0.28);
  border-radius: 1px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.22s ease, opacity 0.22s ease;
}
.nav-toggle[aria-expanded="true"] { color: var(--c-neon); border-color: rgba(53, 240, 164, 0.5); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.site-nav {
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  background: rgba(6, 21, 18, 0.6);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  justify-content: center;
  gap: 2px;
  width: min(var(--wrap), 100% - (var(--gutter) * 2));
  margin-inline: auto;
  padding: 0;
}

.site-nav__item { display: flex; }

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 16px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.site-nav__link:hover { color: var(--c-cream); background: rgba(53, 240, 164, 0.07); }
.site-nav__link:focus-visible { outline: 2px solid var(--c-neon); outline-offset: -2px; }

.site-nav__link[aria-current="page"] {
  color: var(--c-neon);
  border-bottom-color: var(--c-neon);
  background: rgba(53, 240, 164, 0.06);
}
.site-nav__link[aria-current="page"] .nav-idx { color: var(--c-neon); }

.nav-idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--text-faint);
}

/* ---------- 13. Footer ---------- */
.site-footer {
  position: relative;
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(53, 240, 164, 0.09), rgba(6, 21, 18, 0) 58%),
    var(--c-night);
  color: var(--c-mist);
  border-top: 1px solid rgba(207, 230, 219, 0.1);
}

.footer-tier {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: min(var(--wrap), 100% - (var(--gutter) * 2));
  margin-inline: auto;
  padding-top: 30px;
}

.footer-tier i { display: block; height: 2px; background: rgba(207, 230, 219, 0.14); }
.footer-tier i:nth-child(1) { width: 100%; }
.footer-tier i:nth-child(2) { width: 76%; background: var(--c-moss); }
.footer-tier i:nth-child(3) { width: 52%; background: rgba(53, 240, 164, 0.42); }
.footer-tier i:nth-child(4) { width: 28%; background: var(--c-amber); }

.footer-main {
  display: grid;
  grid-template-columns: minmax(230px, 1.3fr) repeat(3, minmax(110px, 0.7fr));
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(32px, 4.5vw, 56px) clamp(26px, 3.5vw, 44px);
}

.footer-brand__word {
  display: inline-flex;
  align-items: baseline;
  gap: 0.12em;
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 87.5%;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1;
  color: var(--c-cream);
}

.footer-brand__cn { color: var(--c-neon); font-size: 0.78em; }

.footer-brand__line {
  margin-top: 12px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

.footer-brand__meta {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.footer-group__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-neon);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(207, 230, 219, 0.12);
}

.footer-list li { margin-bottom: 2px; }

.footer-list__link {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: var(--c-mist);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-list__link:hover { color: var(--c-neon); border-bottom-color: rgba(53, 240, 164, 0.6); }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 40px);
  padding-block: clamp(22px, 3vw, 34px);
  border-top: 1px solid rgba(207, 230, 219, 0.12);
}

.footer-contact__item {
  padding-left: 16px;
  border-left: 1px solid rgba(207, 230, 219, 0.14);
}
.footer-contact__item:first-child { padding-left: 0; border-left: 0; }

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 8px;
}

.footer-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.footer-contact__value {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--c-cream);
  word-break: break-word;
}

.footer-contact__note {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-faint);
}

.copy-btn {
  flex: none;
  padding: 4px 8px;
  background: transparent;
  color: var(--c-mist);
  border: 1px solid rgba(207, 230, 219, 0.26);
  border-radius: 1px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.copy-btn:hover { color: var(--c-neon); border-color: var(--c-neon); }

.copy-btn[data-copied="true"] {
  color: var(--c-night);
  background: var(--c-neon);
  border-color: var(--c-neon);
}

.footer-bottom {
  border-top: 1px solid rgba(207, 230, 219, 0.1);
  background: rgba(4, 16, 13, 0.55);
}

.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-block: 16px;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(207, 230, 219, 0.58);
}

.footer-copy--meta { color: var(--text-faint); }

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: transparent;
  color: var(--c-cream);
  border: 1px solid rgba(207, 230, 219, 0.26);
  border-radius: 1px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.to-top:hover {
  background: var(--c-neon);
  color: var(--c-night);
  border-color: var(--c-neon);
}

/* ---------- 14. Reveal ---------- */
@media (prefers-reduced-motion: no-preference) {
  html.has-js [data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition:
      opacity 0.55s ease,
      transform 0.55s cubic-bezier(0.22, 0.7, 0.3, 1);
    transition-delay: calc(var(--reveal-i, 0) * 45ms);
    will-change: opacity, transform;
  }
  html.has-js [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 15. Focus & motion ---------- */
:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 3px;
}

.section--light :where(a, button, [tabindex]):focus-visible,
.footer-contact :focus-visible {
  outline-color: var(--c-neon);
}

@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;
  }

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

/* ---------- 16. Responsive ---------- */
@media (max-width: 1080px) {
  .masthead { grid-template-columns: auto 1fr auto; }
  .masthead__edge { display: none; }
  .masthead__brand { align-items: center; }
}

@media (max-width: 880px) {
  html { scroll-padding-top: 104px; }

  .masthead {
    grid-template-columns: 1fr auto;
    gap: 12px;
    padding-block: 14px 12px;
  }

  .masthead__brand { grid-column: 1; align-items: flex-start; }
  .masthead__brand-sub { font-size: 9px; letter-spacing: 0.24em; }
  .masthead__actions { grid-column: 2; }

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

  .site-nav {
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    border-top: 0;
    background: var(--c-night);
    transition: max-height 0.3s ease, visibility 0.3s ease;
  }

  .site-nav[data-open] {
    max-height: 78vh;
    overflow-y: auto;
    visibility: visible;
    border-top: 1px solid var(--line-dark);
    border-bottom: 1px solid var(--line-dark);
    box-shadow: 0 18px 30px rgba(4, 16, 13, 0.55);
  }

  .site-nav__list {
    flex-direction: column;
    width: 100%;
    gap: 0;
    padding: 6px 0 12px;
  }

  .site-nav__item { width: 100%; }

  .site-nav__link {
    width: 100%;
    justify-content: flex-start;
    padding: 15px 20px;
    font-size: 16px;
    border-bottom: 1px solid rgba(207, 230, 219, 0.08);
    border-left: 2px solid transparent;
    border-radius: 0;
  }

  .site-nav__link[aria-current="page"] {
    border-bottom-color: rgba(207, 230, 219, 0.08);
    border-left-color: var(--c-neon);
  }

  .footer-main {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }

  .footer-brand { grid-column: 1 / -1; }

  .footer-contact { grid-template-columns: minmax(0, 1fr); }

  .footer-contact__item {
    padding-left: 0;
    padding-top: 16px;
    border-left: 0;
    border-top: 1px solid rgba(207, 230, 219, 0.12);
  }
  .footer-contact__item:first-child { padding-top: 0; border-top: 0; }
}

@media (max-width: 640px) {
  :root { --gutter: 16px; }

  .strip-meta--end { display: none; }
  .masthead__brand-name { font-size: clamp(22px, 6.4vw, 28px); }
  .footer-main { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom__inner { justify-content: flex-start; }
}

@media (max-width: 560px) {
  .masthead__cta { display: none; }
}

@media (max-width: 380px) {
  .masthead__brand-sub { display: none; }
}