/* ============================================================
   爱体育赛事 · 共享站点样式 / assets/site.css
   技术蓝图网格 + 夜光赛场数据墙
   ============================================================ */

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

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

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

ul[class],
ol[class] {
  list-style: none;
  padding: 0;
  margin: 0;
}

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

a { color: inherit; }

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

/* ---------- tokens ---------- */
:root {
  --ink: #071426;
  --ink-2: #061020;
  --panel: #0E2440;
  --panel-2: #122C4D;
  --cyan: #2FF3D0;
  --orange: #FF7A2F;
  --blue: #3B82F6;
  --mist: #9BB7C9;
  --paper: #F2F7FA;
  --line: #1C3A5A;
  --alert: #E4572E;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-2: rgba(255, 255, 255, 0.14);
  --shell: 1320px;
  --gutter: clamp(16px, 3vw, 34px);
  --radius: 14px;
  --radius-sm: 8px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

/* ---------- base ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper);
  background-color: var(--ink);
  background-image:
    radial-gradient(920px 540px at 84% -10%, rgba(47, 243, 208, 0.13), transparent 62%),
    radial-gradient(760px 460px at 4% 2%, rgba(255, 122, 47, 0.09), transparent 64%),
    linear-gradient(to right, rgba(28, 58, 90, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28, 58, 90, 0.42) 1px, transparent 1px);
  background-size: auto, auto, 88px 88px, 88px 88px;
  background-attachment: fixed, fixed, fixed, fixed;
  min-height: 100vh;
  overflow-x: hidden;
}

@media (min-width: 768px) {
  body { font-size: 17px; }
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--paper);
}

h1 { font-size: clamp(2.2rem, 5vw, 4.2rem); }
h2 { font-size: clamp(1.55rem, 3.2vw, 2.6rem); }
h3 { font-size: clamp(1.12rem, 1.8vw, 1.5rem); }

p { max-width: 68ch; }

a { text-decoration-color: rgba(47, 243, 208, 0.5); }

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

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

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

.np-grid { display: grid; }

.bp-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(12px, 1.6vw, 24px);
}

.bp-span--3 { grid-column: span 3; }
.bp-span--4 { grid-column: span 4; }
.bp-span--5 { grid-column: span 5; }
.bp-span--6 { grid-column: span 6; }
.bp-span--7 { grid-column: span 7; }
.bp-span--8 { grid-column: span 8; }
.bp-span--9 { grid-column: span 9; }
.bp-span--12 { grid-column: span 12; }

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, var(--line), rgba(28, 58, 90, 0.1) 70%, transparent);
}

.num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.index-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.annotation {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
  flex: none;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--mist);
  font-size: 0.76rem;
  font-weight: 500;
  line-height: 1.6;
  white-space: nowrap;
}

.chip--cyan {
  color: var(--cyan);
  border-color: rgba(47, 243, 208, 0.4);
  background: rgba(47, 243, 208, 0.1);
}

.chip--orange {
  color: var(--orange);
  border-color: rgba(255, 122, 47, 0.42);
  background: rgba(255, 122, 47, 0.1);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms var(--ease), background-color 160ms var(--ease),
    border-color 160ms var(--ease), color 160ms var(--ease), filter 160ms var(--ease);
}

.btn--primary {
  color: #08131f;
  background: linear-gradient(100deg, var(--orange), #ff9b5c);
  box-shadow: 0 10px 26px rgba(255, 122, 47, 0.22);
}

.btn--primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.06);
}

.btn--ghost {
  color: var(--paper);
  border-color: rgba(47, 243, 208, 0.45);
  background: rgba(47, 243, 208, 0.06);
}

.btn--ghost:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--quiet {
  color: var(--mist);
  padding-inline: 4px;
  border-radius: 0;
  border-bottom: 1px solid var(--line);
}

.btn--quiet:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- panels ---------- */
.panel {
  position: relative;
  padding: clamp(16px, 2.4vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.panel--solid {
  background: linear-gradient(165deg, #102a49, #0a1a2f 70%);
  box-shadow: 0 24px 48px -30px rgba(0, 0, 0, 0.9);
}

.panel--glass {
  background: var(--glass);
  border-color: rgba(155, 183, 201, 0.22);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

/* ---------- breadcrumb ---------- */
.breadcrumb {
  font-size: 0.8rem;
  color: var(--mist);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

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

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

.breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

.breadcrumb__link:hover { color: var(--cyan); }

/* ---------- chapter rail ---------- */
.chapter-rail {
  display: flex;
  flex-direction: column;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.chapter-rail__link {
  display: block;
  padding: 6px 10px 6px 14px;
  border-left: 1px solid var(--line);
  color: var(--mist);
  font-size: 0.82rem;
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.chapter-rail__link:hover { color: var(--paper); }

.chapter-rail__link[aria-current="true"] {
  color: var(--cyan);
  border-left: 2px solid var(--cyan);
}

/* ---------- media frame（图片占位容器） ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  min-height: 120px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(158deg, var(--panel-2), #091a2e 72%);
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(28, 58, 90, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 58, 90, 0.55) 1px, transparent 1px);
  background-size: 36px 36px;
  opacity: 0.6;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: auto -30% -60% auto;
  width: 70%;
  height: 120%;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(circle, rgba(47, 243, 208, 0.16), transparent 66%);
}

.media-frame__img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 7px 18px 7px 14px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #06121f;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

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

/* ---------- reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 480ms var(--ease), transform 480ms var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

[data-chapter] { scroll-margin-top: 150px; }

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 6px;
  background: var(--cyan);
  color: #04121f;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 180ms var(--ease);
}

.skip-link:focus {
  transform: none;
  outline-offset: 2px;
}

/* ============================================================
   header —— 框架式导航
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: linear-gradient(180deg, rgba(7, 20, 38, 0.97), rgba(7, 20, 38, 0.86));
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  box-shadow:
    inset 0 -1px 0 rgba(47, 243, 208, calc(var(--read, 0) * 0.4)),
    0 18px 36px -26px rgba(0, 0, 0, 0.95);
}

.header-progress {
  position: relative;
  height: 2px;
  background: rgba(28, 58, 90, 0.75);
  overflow: hidden;
}

.header-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width 90ms linear;
}

.header-frame {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.header-top {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  min-height: 64px;
  padding-block: 8px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--paper);
  flex: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #04121f;
  background: linear-gradient(135deg, var(--cyan), #8bf9e4);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
  flex: none;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.brand__line {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.header-utility {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.utility-link {
  padding: 6px 12px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--mist);
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.utility-link:hover {
  color: var(--paper);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.05);
}

.utility-link--cta {
  color: var(--cyan);
  border-color: rgba(47, 243, 208, 0.42);
  background: rgba(47, 243, 208, 0.08);
  font-weight: 700;
}

.utility-link--cta:hover {
  color: #04121f;
  background: var(--cyan);
  border-color: var(--cyan);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 15px;
  border: 1px solid rgba(47, 243, 208, 0.4);
  border-radius: 999px;
  background: rgba(47, 243, 208, 0.08);
  color: var(--cyan);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color 160ms var(--ease), color 160ms var(--ease);
}

.nav-toggle:hover {
  background: rgba(47, 243, 208, 0.18);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
  flex: none;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  transition: transform 200ms var(--ease), top 200ms var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 8px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 4px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 4px;
  transform: rotate(-45deg);
}

.site-nav {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid rgba(28, 58, 90, 0.85);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__item {
  display: flex;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px clamp(10px, 1.5vw, 20px);
  border-left: 1px solid rgba(28, 58, 90, 0.62);
  color: var(--mist);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 160ms var(--ease), background-color 160ms var(--ease);
}

.site-nav__item:first-child .site-nav__link { border-left: 0; }

.site-nav__link:hover {
  color: var(--paper);
  background-color: rgba(255, 255, 255, 0.05);
}

.site-nav__link[aria-current="page"] {
  color: var(--cyan);
  background-color: rgba(47, 243, 208, 0.07);
}

.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: rgba(155, 183, 201, 0.55);
}

.site-nav__link[aria-current="page"] .site-nav__index { color: var(--orange); }

.site-nav__cta {
  align-self: center;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 9px 20px;
  color: #08131f;
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  background: linear-gradient(100deg, var(--orange), #ff9b5c);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: transform 160ms var(--ease), filter 160ms var(--ease);
}

.site-nav__cta:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

/* ============================================================
   footer
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 104px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 36, 64, 0.92), #05101d 72%);
  color: var(--mist);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(28, 58, 90, 0.45) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 58, 90, 0.45) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.5;
}

.site-footer::after {
  content: "";
  position: absolute;
  top: -160px;
  right: -100px;
  width: 440px;
  height: 440px;
  pointer-events: none;
  background: radial-gradient(circle, rgba(47, 243, 208, 0.16), transparent 68%);
}

.footer-inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(34px, 5vw, 64px) 22px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(210px, 1.15fr) minmax(0, 1.5fr) minmax(220px, 1fr);
  gap: clamp(22px, 3.4vw, 48px);
}

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

.footer-brand__mark {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.1em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(47, 243, 208, 0.7);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--paper);
  max-width: none;
}

.footer-brand__statement {
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--mist);
  max-width: 34ch;
}

.footer-coords {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(155, 183, 201, 0.72);
  max-width: none;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 28px);
}

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

.footer-col__title {
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(28, 58, 90, 0.9);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  max-width: none;
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  display: inline-block;
  color: var(--mist);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 160ms var(--ease), transform 160ms var(--ease);
}

.footer-link:hover {
  color: var(--cyan);
  transform: translateX(3px);
}

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

.footer-contact__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
}

.footer-contact__row {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(155, 183, 201, 0.7);
}

.footer-contact__value {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.footer-copy {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid rgba(47, 243, 208, 0.4);
  border-radius: 6px;
  background: rgba(47, 243, 208, 0.08);
  color: var(--cyan);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 160ms var(--ease), color 160ms var(--ease), transform 160ms var(--ease);
}

.footer-copy:hover {
  background: var(--cyan);
  color: #04121f;
  transform: translateY(-1px);
}

.footer-copy__status {
  min-height: 1.3em;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
  max-width: none;
}

.footer-note {
  margin-top: 10px;
  font-size: 0.8rem;
  line-height: 1.7;
  color: rgba(155, 183, 201, 0.86);
  max-width: 36ch;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: clamp(24px, 4vw, 44px);
  padding-top: 18px;
  border-top: 1px solid rgba(28, 58, 90, 0.9);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(155, 183, 201, 0.8);
}

.footer-meta .footer-coords {
  letter-spacing: 0.16em;
  color: rgba(155, 183, 201, 0.6);
}

.footer-legal { max-width: none; }
.footer-copyright { max-width: none; color: var(--paper); }

/* ============================================================
   responsive
   ============================================================ */
@media (max-width: 1180px) {
  .site-nav__link { padding-inline: 12px; font-size: 0.86rem; }
  .site-nav__index { display: none; }
}

@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }

  .header-utility .utility-link:not(.utility-link--cta) { display: none; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(14, 36, 64, 0.99), rgba(5, 16, 29, 0.99));
    box-shadow: 0 26px 44px -18px rgba(0, 0, 0, 0.7);
    transition: max-height 280ms var(--ease), visibility 280ms linear;
  }

  .site-nav[data-open] {
    max-height: min(78vh, 560px);
    overflow-y: auto;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .site-nav__item { width: 100%; }

  .site-nav__link {
    width: 100%;
    padding: 15px 20px;
    border-left: 0;
    border-top: 1px solid rgba(28, 58, 90, 0.6);
    font-size: 1rem;
  }

  .site-nav__item:first-child .site-nav__link { border-top: 0; }

  .site-nav__index { display: inline; font-size: 0.7rem; }

  .site-nav__cta {
    align-self: flex-start;
    margin: 16px 20px 22px;
  }

  .footer-top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  }

  .footer-contact {
    grid-column: 1 / -1;
    padding-top: 20px;
    border-top: 1px solid rgba(28, 58, 90, 0.9);
  }
}

@media (max-width: 820px) {
  .bp-grid > [class*="bp-span--"] { grid-column: span 12; }

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

  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-contact { padding-top: 18px; }

  .footer-brand__statement,
  .footer-note { max-width: none; }
}

@media (max-width: 620px) {
  .header-utility { display: none; }

  .brand__line { display: none; }

  .brand__name { font-size: 1rem; }

  .brand__mark { width: 34px; height: 34px; font-size: 0.78rem; }

  .nav-toggle { margin-left: auto; }

  .footer-nav { grid-template-columns: minmax(0, 1fr); gap: 18px; }

  .footer-meta { flex-direction: column; align-items: flex-start; gap: 6px; }
}

@media (max-width: 380px) {
  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 9px 12px; }
}

/* ---------- 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;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .footer-link:hover,
  .btn:hover,
  .site-nav__cta:hover {
    transform: none;
  }
}