/* ============================================================
   BOB赛场 / site.css — 夜间赛场指挥中心共享外壳
   ============================================================ */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, ul, ol, dl, dd, address { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; text-decoration: none; }
address { font-style: normal; }

/* ---------- tokens ---------- */
:root {
  --night: #071A14;
  --field-black: #0B0F0E;
  --glass: #10251E;
  --cyan: #35F2C8;
  --amber: #FFB347;
  --paper: #F4F7F5;
  --mist: #A7B8B0;
  --deep-teal: #1D6B58;
  --cold: #FFFFFF;
  --coral: #FF7A6B;

  --line: rgba(29, 107, 88, 0.55);
  --line-soft: rgba(29, 107, 88, 0.30);
  --cyan-soft: rgba(53, 242, 200, 0.14);
  --amber-soft: rgba(255, 179, 71, 0.10);

  --font-display: system-ui, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: system-ui, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;

  --step-hero: clamp(2.6rem, 7vw, 6.4rem);
  --step-h2: clamp(1.8rem, 3.4vw, 3.2rem);
  --step-h3: clamp(1.12rem, 1.7vw, 1.5rem);

  --gutter: clamp(20px, 5vw, 72px);
  --header-h: 68px;
  --radius: 2px;
}

/* ---------- base ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.95rem + 0.2vw, 1.08rem);
  line-height: 1.75;
  color: var(--paper);
  background-color: var(--night);
  background-image:
    repeating-linear-gradient(to right, rgba(29, 107, 88, 0.22) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(to bottom, rgba(29, 107, 88, 0.18) 0 1px, transparent 1px 96px),
    radial-gradient(120% 72% at 88% -8%, rgba(53, 242, 200, 0.13), transparent 62%),
    radial-gradient(82% 55% at 2% 4%, rgba(255, 179, 71, 0.07), transparent 58%);
  background-repeat: repeat, repeat, no-repeat, no-repeat;
  -webkit-font-smoothing: antialiased;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background: repeating-linear-gradient(to bottom, rgba(53, 242, 200, 0.028) 0 1px, transparent 1px 4px);
  opacity: 0.75;
  mix-blend-mode: screen;
  animation: scan-drift 16s linear infinite;
}

@keyframes scan-drift {
  from { background-position-y: 0; }
  to { background-position-y: 96px; }
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.02em;
}

p { text-wrap: pretty; }

a { transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease; }

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

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

#main-content { scroll-margin-top: calc(var(--header-h) + 16px); }

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  transform: translateY(-220%);
  padding: 12px 18px;
  background: var(--cyan);
  color: var(--night);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  transition: transform 0.2s ease;
}
.skip-link:focus { transform: translateY(0); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(9, 20, 16, 0.88);
  -webkit-backdrop-filter: blur(14px) saturate(125%);
  backdrop-filter: blur(14px) saturate(125%);
  border-bottom: 1px solid var(--line);
  color: var(--paper);
}

.header-grid {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: var(--header-h);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
}

.brand-lockup { display: flex; align-items: center; gap: 12px; padding: 8px 0; }

.brand-mark {
  position: relative;
  width: 26px;
  height: 26px;
  flex: none;
  border: 1px solid var(--cyan);
  background: linear-gradient(135deg, rgba(53, 242, 200, 0.30), transparent 62%);
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-top: 2px solid var(--amber);
  border-left: 2px solid var(--cyan);
  transform: skewX(-14deg);
}

.brand-text { display: block; }
.brand-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.07em;
  line-height: 1.15;
}
.brand-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--mist);
  line-height: 1.4;
}

.primary-nav { display: flex; align-items: center; justify-content: center; }

.nav-list { display: flex; align-items: center; gap: clamp(6px, 1.4vw, 20px); flex-wrap: wrap; }

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 2px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 1px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.24s ease;
}
.nav-link:hover, .nav-link:focus-visible { color: var(--paper); }
.nav-link:hover::after, .nav-link:focus-visible::after, .nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--paper); }

.nav-dot {
  width: 5px;
  height: 5px;
  flex: none;
  border-radius: 50%;
  background: rgba(167, 184, 176, 0.45);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}
.nav-link[aria-current="page"] .nav-dot {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 242, 200, 0.18);
}

.nav-utility { display: none; }
.nav-utility-link {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border: 1px solid rgba(53, 242, 200, 0.42);
  padding: 9px 14px;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}
.nav-utility-link:hover, .nav-utility-link:focus-visible { background: rgba(53, 242, 200, 0.14); }

.header-actions { display: flex; align-items: center; gap: 10px; justify-self: end; }

.header-cta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  padding: 10px 15px;
  border: 1px solid rgba(53, 242, 200, 0.55);
  color: var(--cyan);
  background: rgba(53, 242, 200, 0.07);
  white-space: nowrap;
}
.header-cta:hover, .header-cta:focus-visible { background: var(--cyan); color: var(--night); border-color: var(--cyan); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  min-height: 44px;
  min-width: 44px;
  color: var(--paper);
  border: 1px solid var(--line);
  justify-content: center;
}
.nav-toggle:hover, .nav-toggle:focus-visible { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle-bar { position: relative; display: block; width: 18px; height: 2px; background: currentColor; }
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.24s ease, top 0.24s ease;
}
.nav-toggle-bar::before { top: -6px; }
.nav-toggle-bar::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after { top: 0; transform: rotate(-45deg); }

.nav-toggle-label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; }

.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  background: rgba(53, 242, 200, 0.10);
}
.scroll-meter-fill {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

/* ---------- footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 140px);
  padding-top: clamp(40px, 6vw, 76px);
  background: var(--field-black);
  border-top: 1px solid var(--line);
  color: var(--paper);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(240px, 42%);
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.footer-shell {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 64px);
}

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

.footer-brand {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.45rem;
  letter-spacing: 0.09em;
  border-bottom: 1px solid transparent;
}
.footer-brand:hover, .footer-brand:focus-visible { color: var(--cyan); border-bottom-color: var(--cyan); }

.footer-summary {
  margin-top: 14px;
  max-width: 32em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: clamp(22px, 3vw, 44px);
  min-width: 0;
}

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

.footer-heading {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-list { display: grid; gap: 9px; }

.footer-list a {
  font-size: 14px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
}
.footer-list a:hover, .footer-list a:focus-visible { color: var(--paper); border-bottom-color: var(--cyan); }

.footer-contact-item {
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}
.footer-contact-value {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.01em;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.footer-base {
  max-width: 1440px;
  margin: clamp(32px, 5vw, 60px) auto 0;
  padding: 18px var(--gutter) 30px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.footer-legal { color: var(--mist); }
.footer-copy { color: var(--mist); }
.footer-top { color: var(--paper); }
.footer-top:hover, .footer-top:focus-visible { color: var(--cyan); }

/* ---------- layout utilities ---------- */
.shell {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(44px, 7vw, 96px); }

.split { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(24px, 4vw, 56px); }
.split--even, .split--7-5, .split--5-7 { grid-template-columns: minmax(0, 1fr); }

@media (min-width: 960px) {
  .split--even { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split--7-5 { grid-template-columns: 7fr 5fr; }
  .split--5-7 { grid-template-columns: 5fr 7fr; }
  .footer-shell { grid-template-columns: 4fr 8fr; }
}

/* ---------- headings ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(24px, 4vw, 48px);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
  flex: none;
}

.section-title {
  font-size: var(--step-h2);
  letter-spacing: 0.02em;
  color: var(--paper);
}

.lede {
  max-width: 34em;
  font-size: clamp(1.02rem, 1.5vw, 1.26rem);
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- prose ---------- */
.prose { max-width: 34em; color: var(--paper); }
.prose p + p { margin-top: 1em; }
.prose h3 { margin-top: 1.8em; font-size: var(--step-h3); }
.prose ul, .prose ol { margin-top: 1em; display: grid; gap: 0.5em; padding-left: 1.1em; }
.prose ul li { list-style: none; position: relative; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: -1.1em;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(53, 242, 200, 0.42); }
.prose a:hover, .prose a:focus-visible { color: var(--paper); border-bottom-color: var(--paper); }
.prose strong { font-weight: 700; color: var(--cold); }

.rule {
  height: 1px;
  border: 0;
  margin: clamp(28px, 5vw, 56px) 0;
  background: linear-gradient(90deg, var(--line), transparent);
}

.note {
  padding: 16px 18px;
  border-left: 2px solid var(--amber);
  background: var(--amber-soft);
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.link-arrow::after { content: "→"; transition: transform 0.2s ease; }
.link-arrow:hover, .link-arrow:focus-visible { color: var(--paper); border-bottom-color: var(--paper); }
.link-arrow:hover::after, .link-arrow:focus-visible::after { transform: translateX(4px); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  border: 1px solid var(--line);
  color: var(--paper);
  background: transparent;
  cursor: pointer;
}
.btn:hover, .btn:focus-visible { border-color: var(--cyan); color: var(--cyan); }

.btn--primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--night);
}
.btn--primary:hover, .btn--primary:focus-visible { background: var(--paper); border-color: var(--paper); color: var(--night); }

.btn--ghost { border-color: rgba(53, 242, 200, 0.5); color: var(--cyan); }
.btn--ghost:hover, .btn--ghost:focus-visible { background: rgba(53, 242, 200, 0.14); color: var(--cyan); }

/* ---------- tags ---------- */
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 34px;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
  border: 1px solid var(--line-soft);
  background: rgba(16, 37, 30, 0.5);
  cursor: pointer;
}
.tag:hover, .tag:focus-visible { color: var(--paper); border-color: var(--cyan); }
.tag--active, .tag[aria-pressed="true"] {
  color: var(--night);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- panels ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.panel--glass {
  background: rgba(16, 37, 30, 0.58);
  -webkit-backdrop-filter: blur(12px) saturate(120%);
  backdrop-filter: blur(12px) saturate(120%);
  border-color: var(--line);
}

.panel--solid {
  background: var(--paper);
  color: #0B1A15;
  border-color: rgba(7, 26, 20, 0.12);
}
.panel--solid .panel-title { color: #071A14; }
.panel--solid .panel-body, .panel--solid p { color: #26443A; }
.panel--solid a { color: #0E6B54; border-bottom: 1px solid rgba(14, 107, 84, 0.4); }
.panel--solid a:hover, .panel--solid a:focus-visible { color: #071A14; border-bottom-color: #071A14; }

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
}
.panel--solid .panel-head { border-bottom-color: rgba(7, 26, 20, 0.14); }

.panel-title {
  font-size: var(--step-h3);
  letter-spacing: 0.03em;
}
.panel-body { font-size: 15px; line-height: 1.8; }

/* ---------- data figures ---------- */
.data-figure { display: grid; gap: 4px; }
.data-figure-value {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.6vw, 3.4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.data-figure-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}
.data-figure--amber .data-figure-value { color: var(--amber); }

/* ---------- status strip ---------- */
.status-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.status-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}
.status-dot {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 0 rgba(53, 242, 200, 0.45);
  animation: status-pulse 2.6s ease-out infinite;
}
@keyframes status-pulse {
  0% { box-shadow: 0 0 0 0 rgba(53, 242, 200, 0.45); }
  70% { box-shadow: 0 0 0 7px rgba(53, 242, 200, 0); }
  100% { box-shadow: 0 0 0 0 rgba(53, 242, 200, 0); }
}

/* ---------- index list ---------- */
.index-list { display: grid; gap: 0; }

.index-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0 18px 0;
  border-top: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  padding-left: 0;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}
.index-list .index-item:last-child { border-bottom: 1px solid var(--line-soft); }
.index-item:hover, .index-item:focus-within {
  border-left-color: var(--cyan);
  background: rgba(53, 242, 200, 0.04);
  padding-left: 14px;
}

.index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  padding-top: 5px;
}

.index-body { min-width: 0; }

.index-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.index-note {
  margin-top: 4px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- timeline ---------- */
.timeline { display: grid; gap: 0; }

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  padding: 0 0 28px 0;
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line), transparent);
}
.timeline-item:last-child::before { display: none; }

.timeline-mark {
  width: 11px;
  height: 11px;
  margin-top: 6px;
  flex: none;
  border: 1px solid var(--cyan);
  background: rgba(53, 242, 200, 0.18);
  transform: skewX(-14deg);
}
.timeline-body { min-width: 0; }

/* ---------- breadcrumbs ---------- */
.breadcrumbs { padding-block: 14px 0; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.breadcrumb-item { display: inline-flex; align-items: center; gap: 6px; }
.breadcrumb-item:not(:last-child)::after { content: "/"; color: var(--deep-teal); }
.breadcrumb-item a { color: var(--mist); }
.breadcrumb-item a:hover, .breadcrumb-item a:focus-visible { color: var(--cyan); }
.breadcrumb-item[aria-current="page"] { color: var(--paper); }

/* ---------- media ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(90% 70% at 70% 0%, rgba(53, 242, 200, 0.16), transparent 60%),
    linear-gradient(160deg, rgba(16, 37, 30, 0.95), rgba(7, 26, 20, 0.98));
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06) brightness(0.92);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, transparent 56%, rgba(7, 26, 20, 0.78)),
    repeating-linear-gradient(to bottom, rgba(53, 242, 200, 0.06) 0 1px, transparent 1px 6px);
}
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* ---------- decorative grid field ---------- */
.grid-field {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, rgba(53, 242, 200, 0.10) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(to bottom, rgba(53, 242, 200, 0.07) 0 1px, transparent 1px 64px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
}

/* ---------- reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

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

/* ---------- responsive: nav drawer ---------- */
@media (max-width: 900px) {
  .header-grid {
    grid-template-columns: minmax(0, 1fr) auto;
    min-height: 62px;
    gap: 12px;
  }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 8px var(--gutter) 26px;
    background: rgba(7, 26, 20, 0.98);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 30px 46px -26px rgba(0, 0, 0, 0.9);
    max-height: calc(100vh - 62px);
    overflow-y: auto;
  }
  .primary-nav[data-open] { display: flex; }

  .nav-list { flex-direction: column; align-items: stretch; width: 100%; gap: 0; }

  .nav-item { border-top: 1px solid var(--line-soft); }
  .nav-list .nav-item:first-child { border-top: 0; }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    gap: 10px;
    padding: 15px 0;
    font-size: 15px;
    letter-spacing: 0.06em;
    color: var(--paper);
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { color: var(--cyan); }

  .nav-utility {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding-top: 18px;
  }

  .nav-toggle { display: inline-flex; }
  .header-cta { font-size: 10px; padding: 9px 12px; }
}

@media (max-width: 560px) {
  .header-cta { display: none; }
  .brand-tag { font-size: 9px; letter-spacing: 0.16em; }
  .footer-base { justify-content: flex-start; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body::after { animation: none; }
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .status-dot { animation: none; box-shadow: 0 0 0 3px rgba(53, 242, 200, 0.16); }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}