/* ==========================================================
   6686官方版 — Site Kit
   File: /assets/site.css
   Version: V3.0
   ========================================================== */

/* ---------- 1. Design Tokens ---------- */
:root {
  --color-bg: #0B1B2E;
  --color-bg-deep: #071524;
  --color-bg-lighter: #122A3C;
  --color-accent: #00FF88;
  --color-accent-dark: #00C46B;
  --color-accent-border: rgba(0, 255, 136, 0.35);
  --color-orange: #FF6A00;
  --color-text: #E6F1FF;
  --color-text-secondary: #9AB8D8;
  --color-border: #1E3A5F;
  --color-danger: #FF4D4F;
  --glow-green: rgba(0, 255, 136, 0.3);
  --glow-green-strong: rgba(0, 255, 136, 0.55);
  --shadow-panel: 0 16px 40px rgba(0, 0, 0, 0.35);
  --ease-power: cubic-bezier(0.22, 1, 0.36, 1);

  --font-display: 'Orbitron', 'Michroma', 'Space Grotesk', 'Arial Black',
                  'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'Source Sans Pro', 'PingFang SC',
               'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', system-ui, sans-serif;

  --container-width: 1200px;
  --container-wide: 1440px;
  --container-narrow: 760px;
  --container-pad: 24px;
  --header-height: 76px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --transition-fast: 180ms;
  --transition-base: 300ms;
}

/* ---------- 2. Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(720px 340px at 88% -5%, rgba(0, 255, 136, 0.09), transparent 70%),
    radial-gradient(900px 480px at 0% 45%, rgba(18, 42, 60, 0.7), transparent 60%),
    radial-gradient(640px 420px at 96% 92%, rgba(255, 106, 0, 0.05), transparent 60%),
    linear-gradient(180deg, #0B1B2E 0%, #0E2438 55%, #081525 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

button {
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

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

h1, h2, h3, h4, p, figure, blockquote, dl, dd {
  margin: 0;
}

h1, h2, h3, h4 {
  margin-bottom: 0.5em;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(36px, 5.5vw, 72px);
  text-transform: uppercase;
}

h2 {
  font-size: clamp(26px, 3.6vw, 42px);
  text-transform: uppercase;
}

h3 {
  font-size: clamp(19px, 2vw, 24px);
}

h4 {
  font-size: 17px;
}

p {
  margin-bottom: 1em;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast) ease;
}

a:hover {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg-deep);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--glow-green);
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-deep);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

/* ---------- 3. Utilities ---------- */

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 2000;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-bg-deep);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  box-shadow: 0 0 24px var(--glow-green);
  transform: translateY(-180%);
  transition: transform var(--transition-base) ease;
  pointer-events: auto;
}

.skip-link:hover {
  color: var(--color-bg-deep);
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 4. Page Scaffold ---------- */

.container,
.container--wide,
.container--narrow {
  width: 100%;
  margin-right: auto;
  margin-left: auto;
  padding-right: var(--container-pad);
  padding-left: var(--container-pad);
}

.container {
  max-width: var(--container-width);
}

.container--wide {
  max-width: var(--container-wide);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.main-content {
  min-height: 60vh;
  padding-top: calc(var(--header-height) + 20px);
  overflow-x: hidden;
  overflow-x: clip;
}

.main-content--flush {
  padding-top: 0;
}

#main-content,
[id] {
  scroll-margin-top: 110px;
}

.section {
  padding-top: clamp(56px, 8vw, 104px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.section--tight {
  padding-top: clamp(32px, 5vw, 56px);
  padding-bottom: clamp(32px, 5vw, 56px);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section-label::before {
  content: "";
  width: 34px;
  height: 2px;
  background: var(--color-accent);
  box-shadow: 0 0 10px var(--glow-green);
  flex: none;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-text);
}

.page-lead {
  margin-bottom: 0;
  font-size: 18px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  max-width: 680px;
}

/* ---------- 5. Grid System ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.grid__col--4 {
  grid-column: span 4;
}

.grid__col--6 {
  grid-column: span 6;
}

.grid__col--8 {
  grid-column: span 8;
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

@media (max-width: 900px) {
  .grid__col--4,
  .grid__col--6,
  .grid__col--8 {
    grid-column: span 12;
  }
}

/* ---------- 6. Buttons & Badges ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid transparent;
  transition: transform var(--transition-fast) ease,
              box-shadow var(--transition-fast) ease,
              background var(--transition-fast) ease,
              border-color var(--transition-fast) ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-bg-deep);
  box-shadow: 0 0 24px var(--glow-green), 0 8px 20px rgba(0, 0, 0, 0.35);
}

.btn--primary:hover {
  color: var(--color-bg-deep);
  box-shadow: 0 0 40px var(--glow-green-strong), 0 12px 28px rgba(0, 0, 0, 0.35);
}

.btn--ghost {
  border-color: var(--color-border);
  color: var(--color-text);
  background: rgba(230, 241, 255, 0.03);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: 0 0 20px var(--glow-green);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-bg-lighter);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.badge--accent {
  border-color: var(--color-accent-border);
  color: var(--color-accent);
  box-shadow: inset 0 0 12px rgba(0, 255, 136, 0.08);
}

.badge--orange {
  border-color: rgba(255, 106, 0, 0.5);
  color: var(--color-orange);
}

/* ---------- 7. Cards & Media ---------- */

.card {
  position: relative;
  padding: 28px;
  background: var(--color-bg-lighter);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base) ease,
              box-shadow var(--transition-base) ease,
              transform var(--transition-base) ease;
}

.card:hover {
  border-color: rgba(0, 255, 136, 0.4);
  box-shadow: 0 0 0 1px rgba(0, 255, 136, 0.12), var(--shadow-panel);
  transform: translateY(-4px);
}

.card--print {
  border-radius: 2px;
  box-shadow: 0 0 0 3px var(--color-bg-lighter), 0 0 0 4px var(--color-border);
}

.card--print:hover {
  box-shadow: 0 0 0 3px var(--color-bg-lighter),
              0 0 0 4px var(--color-accent),
              0 20px 40px rgba(0, 0, 0, 0.35);
}

.card--cut {
  border-radius: 2px;
}

.card--cut::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, transparent 50%, var(--color-accent) 50%);
  z-index: 1;
}

.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background:
    linear-gradient(135deg, var(--color-bg-lighter), #081A2B),
    var(--color-bg-lighter);
  aspect-ratio: 16 / 9;
}

.media::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(30, 58, 95, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 58, 95, 0.35) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.media::after {
  content: attr(data-label);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  opacity: 0.55;
  background: radial-gradient(ellipse at center, rgba(0, 255, 136, 0.06), transparent 72%);
  pointer-events: none;
}

.media--4-3 {
  aspect-ratio: 4 / 3;
}

.media--square {
  aspect-ratio: 1 / 1;
}

.media--tall {
  aspect-ratio: 3 / 4;
}

.media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  transition: transform 0.5s var(--ease-power);
}

.media:hover img {
  transform: scale(1.03);
}

/* ---------- 8. Breadcrumbs & Data Table ---------- */

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--color-border);
}

.breadcrumbs__item a {
  color: var(--color-text-secondary);
}

.breadcrumbs__item a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.breadcrumbs__item[aria-current="page"] {
  color: var(--color-accent);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--color-border);
  background: rgba(11, 27, 46, 0.6);
  font-size: 14px;
}

.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-bg-lighter);
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover td {
  background: rgba(0, 255, 136, 0.04);
}

/* ---------- 9. Sticky TOC ---------- */

.toc {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  padding: 20px 18px;
  background: rgba(18, 42, 60, 0.78);
  border: 1px solid var(--color-border);
  border-left: 2px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-panel);
}

.toc__link {
  display: block;
  padding: 7px 0 7px 14px;
  margin-left: -2px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast) ease,
              border-color var(--transition-fast) ease;
}

.toc__link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.toc__link[aria-current="true"] {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

/* ---------- 10. Scroll Reveal ---------- */

html.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease-power),
              transform 0.7s var(--ease-power);
}

html.js-enabled [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 11. Site Header ---------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 12px 16px 0;
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 10px 8px 14px;
  background: rgba(11, 27, 46, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-accent-border);
  border-radius: var(--radius-pill);
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.45),
              inset 0 1px 0 rgba(230, 241, 255, 0.05);
  pointer-events: auto;
}

.site-header__inner::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 5%;
  right: 5%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.7;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

.brand:hover {
  text-decoration: none;
}

.brand__glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: var(--color-bg-deep);
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.02em;
  box-shadow: 0 0 16px var(--glow-green);
  transform: skewX(-6deg);
  animation: brand-pulse 3s ease-in-out infinite;
}

@keyframes brand-pulse {
  0%, 100% {
    box-shadow: 0 0 12px rgba(0, 255, 136, 0.35);
  }
  50% {
    box-shadow: 0 0 26px rgba(0, 255, 136, 0.6);
  }
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.2;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-text);
  white-space: nowrap;
}

.brand__tag {
  font-family: var(--font-display);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--color-accent);
  white-space: nowrap;
}

.brand--footer:hover {
  text-decoration: none;
}

/* ---------- 12. Main Navigation ---------- */

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav__link {
  position: relative;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast) ease,
              background var(--transition-fast) ease,
              box-shadow var(--transition-fast) ease;
}

.main-nav__link:hover {
  color: var(--color-text);
  background: rgba(0, 255, 136, 0.08);
  text-decoration: none;
}

.main-nav__link[aria-current="page"] {
  color: var(--color-bg-deep);
  background: var(--color-accent);
  box-shadow: 0 0 20px var(--glow-green), 0 4px 14px rgba(0, 0, 0, 0.3);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: rgba(0, 255, 136, 0.08);
  flex: none;
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-accent);
  transition: transform var(--transition-fast) ease,
              opacity var(--transition-fast) ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 13. Progress Bar ---------- */

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1500;
  background: transparent;
  pointer-events: none;
}

.progress-bar__fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-dark) 55%, var(--color-orange));
  box-shadow: 0 0 10px var(--color-accent), 0 0 22px var(--glow-green);
}

/* ---------- 14. Site Footer ---------- */

.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 120px);
  background: linear-gradient(180deg, rgba(10, 23, 41, 0.85), var(--color-bg-deep));
  border-top: 2px solid var(--color-accent);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

.site-footer__inner {
  max-width: calc(var(--container-width) + 48px);
  margin: 0 auto;
  padding: clamp(48px, 7vw, 72px) var(--container-pad) 0;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.25fr 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.site-footer__block {
  min-width: 0;
}

.site-footer__block--brand {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.site-footer__trust {
  font-size: 13px;
  line-height: 1.85;
  color: var(--color-text-secondary);
  margin: 0;
}

.site-footer__heading {
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.site-footer__list {
  display: grid;
  gap: 10px;
}

.site-footer__list--contact {
  gap: 12px;
}

.site-footer__link {
  display: inline-block;
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast) ease,
              padding-left var(--transition-fast) ease;
}

.site-footer__link:hover {
  color: var(--color-accent);
  padding-left: 4px;
  text-decoration: none;
}

.site-footer__contact-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(30, 58, 95, 0.7);
}

.site-footer__contact-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.site-footer__label {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  opacity: 0.85;
}

.site-footer__value {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  word-break: break-all;
}

.site-footer__notice {
  margin: 18px 0 0;
  font-size: 12px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  opacity: 0.8;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 24px;
  margin-top: clamp(36px, 5vw, 56px);
  padding: 20px 0 28px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.site-footer__copyright,
.site-footer__icp {
  margin: 0;
}

/* ---------- 15. Back to Top ---------- */

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--color-accent);
  background: rgba(11, 27, 46, 0.92);
  color: var(--color-accent);
  box-shadow: 0 0 20px var(--glow-green), 0 8px 24px rgba(0, 0, 0, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity var(--transition-base) ease,
              transform var(--transition-base) ease,
              visibility var(--transition-base) ease,
              background var(--transition-fast) ease,
              color var(--transition-fast) ease;
}

.back-to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent);
  color: var(--color-bg-deep);
  box-shadow: 0 0 30px var(--glow-green-strong);
}

/* ---------- 16. Responsive ---------- */

@media (max-width: 960px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 880px) {
  .nav-toggle {
    display: inline-flex;
  }

  .main-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px;
    background: rgba(8, 20, 36, 0.98);
    border: 1px solid var(--color-accent-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.6), 0 0 24px rgba(0, 255, 136, 0.06);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.22s ease,
                transform 0.22s ease,
                visibility 0.22s;
  }

  .main-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .main-nav__link {
    display: block;
    padding: 13px 18px;
    border-radius: 10px;
    text-align: center;
    font-size: 15px;
  }

  .main-nav__link[aria-current="page"] {
    box-shadow: 0 0 18px var(--glow-green);
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
  }
}

@media (max-width: 640px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .brand__tag {
    letter-spacing: 0.22em;
  }

  .site-header {
    padding-left: 12px;
    padding-right: 12px;
  }
}

/* ---------- 17. Reduced Motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .brand__glyph {
    animation: none;
  }

  html.js-enabled [data-reveal],
  html.js-enabled [data-reveal][data-revealed="true"] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .media img {
    transition: none;
  }
}