/* ============================================================
   星空体育 · 共享 Site Kit
   设计语言：深空赛场指挥中枢 / 展览画册式框景 / 命令栏索引
   ============================================================ */

/* ---------- 01 变量与重置 ---------- */

:root {
  --c-space: #0A1F44;
  --c-night: #061228;
  --c-nebula: #0F2D5C;
  --c-star: #F5F7FA;
  --c-meteor: #FF6B35;
  --c-cyan: #00E5FF;
  --c-dust: #9BA8BD;
  --c-void: #020814;

  --f-display: Impact, 'Arial Black', '思源黑体 Heavy', sans-serif;
  --f-body: 'Inter', '思源黑体', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --f-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;

  --r-lg: 28px;
  --r-md: 16px;
  --r-sm: 10px;
  --r-pill: 999px;

  --shell-max: 1240px;
  --shell-gutter: 5vw;
  --hdr-h: 68px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 0.25s;
  --dur-slow: 0.5s;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--f-body);
  font-size: 1rem;
  line-height: 1.6;
  background: var(--c-space);
  color: var(--c-star);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol {
  list-style: none;
}

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

a:hover {
  color: var(--c-star);
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

::selection {
  background: var(--c-meteor);
  color: var(--c-star);
}

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

#main-content:focus {
  outline: none;
}

/* ---------- 02 基础排版 ---------- */

h1, h2, h3, h4 {
  font-family: var(--f-display);
  line-height: 1.1;
  color: var(--c-star);
  font-weight: 400;
}

.display-title {
  font-size: clamp(3rem, 8vw, 5.5rem);
  line-height: 0.95;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.05;
  margin-bottom: 0.35em;
}

.section-title__index {
  display: block;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin-bottom: 8px;
}

.body-copy {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-dust);
}

.body-copy strong {
  color: var(--c-star);
  font-weight: 600;
}

/* ---------- 03 可达性辅助 ---------- */

.skip-orbit {
  position: fixed;
  top: 12px;
  left: 50%;
  z-index: 3000;
  transform: translate(-50%, -220%);
  padding: 10px 22px;
  background: var(--c-meteor);
  color: #fff;
  border-radius: var(--r-pill);
  font-family: var(--f-body);
  font-size: 0.8125rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.45);
  transition: transform 0.3s var(--ease);
}

.skip-orbit:focus-visible {
  transform: translate(-50%, 0);
}

/* ---------- 04 布局工具 ---------- */

.site-shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--shell-gutter);
}

.site-section {
  padding-block: clamp(48px, 8vw, 88px);
}

.site-section--alt {
  background: var(--c-night);
  border-block: 1px solid rgba(0, 229, 255, 0.08);
}

.site-grid {
  display: grid;
  gap: 24px;
}

.site-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.site-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.site-grid--wide-narrow {
  grid-template-columns: 2fr 1fr;
}

.site-grid--narrow-wide {
  grid-template-columns: 1fr 2fr;
}

/* ---------- 05 通用按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--r-pill);
  font-family: var(--f-body);
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.btn-primary {
  background: var(--c-meteor);
  color: #fff;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.25);
}

.btn-primary:hover {
  background: #ff8248;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(255, 107, 53, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--c-cyan);
  border-color: rgba(0, 229, 255, 0.4);
}

.btn-outline:hover {
  border-color: var(--c-cyan);
  background: rgba(0, 229, 255, 0.08);
  color: var(--c-cyan);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--c-star);
  border-color: rgba(245, 247, 250, 0.25);
}

.btn-ghost:hover {
  border-color: var(--c-star);
  background: rgba(245, 247, 250, 0.06);
  color: var(--c-star);
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

/* ---------- 06 面包屑 ---------- */

.sky-breadcrumb {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 24px var(--shell-gutter) 0;
}

.sky-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--c-dust);
}

.sky-breadcrumb a {
  color: var(--c-dust);
  text-decoration: none;
}

.sky-breadcrumb a:hover {
  color: var(--c-cyan);
}

.sky-breadcrumb li + li::before {
  content: '/';
  margin-right: 8px;
  color: rgba(155, 168, 189, 0.4);
}

.sky-breadcrumb [aria-current='page'] {
  color: var(--c-star);
}

/* ---------- 07 头部导航 ---------- */

.launch-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 31, 68, 0.94);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0, 229, 255, 0.12);
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .launch-header {
    background: var(--c-space);
  }
}

.launch-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan) 0%, var(--c-meteor) 55%, transparent 100%);
  opacity: 0.75;
  pointer-events: none;
}

.launch-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: var(--shell-max);
  min-height: var(--hdr-h);
  margin-inline: auto;
  padding-inline: var(--shell-gutter);
}

.launch-brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  gap: 10px;
  text-decoration: none;
}

.launch-brand__mark {
  font-family: var(--f-display);
  font-size: 1.35rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-star);
  display: inline-flex;
  align-items: center;
}

.launch-brand__signal {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-meteor);
  margin-left: 6px;
  box-shadow: 0 0 8px rgba(255, 107, 53, 0.75);
}

.launch-brand__tag {
  font-family: var(--f-mono);
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-dust);
  padding-top: 2px;
  border-left: 1px solid rgba(155, 168, 189, 0.25);
  padding-left: 10px;
}

.orbit-nav {
  margin-inline: auto;
}

.orbit-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.orbit-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 14px;
  border-radius: var(--r-pill);
  font-family: var(--f-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-star);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.orbit-nav__index {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
  opacity: 0.55;
  transition: opacity var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.orbit-nav__link:hover {
  background: rgba(0, 229, 255, 0.08);
  color: var(--c-cyan);
}

.orbit-nav__link:hover .orbit-nav__index {
  opacity: 1;
}

.orbit-nav__link[aria-current='page'] {
  background: rgba(255, 107, 53, 0.12);
  color: var(--c-meteor);
  box-shadow: inset 0 0 0 1px rgba(255, 107, 53, 0.35);
}

.orbit-nav__link[aria-current='page'] .orbit-nav__index {
  color: var(--c-meteor);
  opacity: 1;
}

.return-gate {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  flex-shrink: 0;
  background: var(--c-meteor);
  color: #fff;
  font-family: var(--f-body);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 2px 12px rgba(255, 107, 53, 0.3);
  transition: background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.return-gate__glyph {
  font-size: 0.875rem;
  line-height: 1;
}

.return-gate:hover {
  background: #ff8248;
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(255, 107, 53, 0.4);
}

.return-gate:active {
  transform: translateY(0) scale(0.98);
}

.return-gate--pulse {
  animation: gate-pulse 0.7s var(--ease);
}

@keyframes gate-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 107, 53, 0.6);
  }
  70% {
    box-shadow: 0 0 0 16px rgba(255, 107, 53, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 107, 53, 0);
  }
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: transparent;
  border: 1px solid rgba(155, 168, 189, 0.3);
  border-radius: 12px;
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.nav-toggle:hover {
  border-color: var(--c-cyan);
  background: rgba(0, 229, 255, 0.06);
}

.nav-toggle__line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-star);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

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

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

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

/* ---------- 08 页脚 ---------- */

.gravity-footer {
  position: relative;
  background: var(--c-night);
  border-top: 1px solid rgba(0, 229, 255, 0.15);
  color: var(--c-star);
  overflow: hidden;
}

.gravity-footer::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(245, 247, 250, 0.6) 50%, transparent 51%),
    radial-gradient(1px 1px at 25% 65%, rgba(0, 229, 255, 0.35) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 40% 15%, rgba(245, 247, 250, 0.4) 50%, transparent 51%),
    radial-gradient(1px 1px at 55% 85%, rgba(255, 107, 53, 0.25) 50%, transparent 51%),
    radial-gradient(1px 1px at 70% 35%, rgba(245, 247, 250, 0.4) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 85% 70%, rgba(0, 229, 255, 0.3) 50%, transparent 51%),
    radial-gradient(1px 1px at 92% 15%, rgba(245, 247, 250, 0.35) 50%, transparent 51%);
}

.gravity-footer__main {
  position: relative;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 64px var(--shell-gutter) 52px;
}

.foot-brand__logo {
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
  text-decoration: none;
}

.foot-brand__mark {
  font-family: var(--f-display);
  font-size: 1.6rem;
  color: var(--c-star);
  display: inline-flex;
  align-items: center;
  letter-spacing: 0.02em;
}

.foot-brand__signal {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-meteor);
  margin-left: 7px;
  box-shadow: 0 0 10px rgba(255, 107, 53, 0.7);
}

.foot-brand__sub {
  font-family: var(--f-mono);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-dust);
}

.foot-brand__promise {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-dust);
  max-width: 38ch;
  margin-bottom: 14px;
}

.foot-brand__keywords {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  line-height: 1.9;
  color: var(--c-dust);
  opacity: 0.65;
}

.foot-route {
  position: relative;
}

.foot-route::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--c-cyan);
  opacity: 0.7;
}

.foot-route__title {
  display: block;
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-cyan);
  margin-bottom: 18px;
}

.foot-route__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.foot-route__list a {
  color: var(--c-dust);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease), padding-left var(--dur-fast) var(--ease);
}

.foot-route__list a:hover {
  color: var(--c-cyan);
  padding-left: 5px;
}

.foot-station__list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 0;
}

.foot-station__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 8px;
  font-size: 0.8125rem;
  line-height: 1.55;
}

.foot-station__item dt {
  font-family: var(--f-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-cyan);
  opacity: 0.7;
  padding-top: 2px;
}

.foot-station__item dd {
  margin: 0;
  color: var(--c-star);
  overflow-wrap: anywhere;
}

.foot-station__note {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid rgba(155, 168, 189, 0.15);
  font-size: 0.6875rem;
  line-height: 1.7;
  color: var(--c-dust);
  opacity: 0.8;
}

.gravity-footer__legal {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px 20px;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 20px var(--shell-gutter);
  border-top: 1px solid rgba(155, 168, 189, 0.12);
  font-size: 0.75rem;
  color: var(--c-dust);
}

/* ---------- 09 内容组件 ---------- */

.data-card {
  position: relative;
  background: linear-gradient(160deg, rgba(15, 45, 92, 0.82), rgba(6, 18, 40, 0.96));
  border: 1px solid rgba(0, 229, 255, 0.1);
  border-radius: var(--r-lg);
  padding: 32px;
  overflow: hidden;
  transition: transform var(--dur-slow) var(--ease), border-color var(--dur-slow) var(--ease), box-shadow var(--dur-slow) var(--ease);
}

.data-card::before,
.data-card::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--c-cyan);
  opacity: 0.35;
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
}

.data-card::before {
  top: 10px;
  right: 10px;
  border-left: none;
  border-bottom: none;
  border-radius: 0 6px 0 0;
}

.data-card::after {
  bottom: 10px;
  left: 10px;
  border-right: none;
  border-top: none;
  border-radius: 0 0 0 6px;
}

.data-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 12px 40px rgba(2, 8, 20, 0.5);
}

.data-card:hover::before,
.data-card:hover::after {
  opacity: 0.9;
}

.scene-panel {
  position: relative;
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: var(--r-lg);
  padding: clamp(32px, 6vw, 72px);
  background:
    radial-gradient(ellipse at 70% 15%, rgba(0, 229, 255, 0.09), transparent 55%),
    linear-gradient(145deg, rgba(15, 45, 92, 0.65), rgba(6, 18, 40, 0.85));
  overflow: hidden;
}

.scene-panel::before {
  content: '';
  position: absolute;
  inset: 16px;
  border: 1px solid rgba(155, 168, 189, 0.13);
  border-radius: calc(var(--r-lg) - 10px);
  pointer-events: none;
}

.scene-panel::after {
  content: '';
  position: absolute;
  top: 0;
  right: 42px;
  width: 1px;
  height: 100%;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 229, 255, 0.18) 0 6px,
    transparent 6px 14px
  );
  opacity: 0.4;
  pointer-events: none;
}

.stat-block {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 26px;
  background: linear-gradient(160deg, rgba(15, 45, 92, 0.6), rgba(6, 18, 40, 0.85));
  border: 1px solid rgba(0, 229, 255, 0.1);
  border-radius: var(--r-md);
  overflow: hidden;
}

.stat-block::before {
  content: '';
  position: absolute;
  top: 0;
  left: 26px;
  width: 34px;
  height: 2px;
  background: var(--c-cyan);
}

.stat-block__number {
  font-family: var(--f-display);
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  line-height: 1;
  color: var(--c-star);
}

.stat-block__number--accent {
  color: var(--c-meteor);
}

.stat-block__label {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-dust);
}

.orbit-legend {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  padding: 12px 22px;
  background: rgba(6, 18, 40, 0.5);
  border: 1px solid rgba(155, 168, 189, 0.2);
  border-radius: var(--r-pill);
  font-size: 0.75rem;
  color: var(--c-dust);
}

.orbit-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.orbit-legend__swatch {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-meteor);
  box-shadow: 0 0 8px rgba(255, 107, 53, 0.5);
}

.orbit-legend__swatch--cyan {
  background: var(--c-cyan);
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
}

.orbit-legend__swatch--dust {
  background: var(--c-dust);
  box-shadow: none;
}

.coordinate-tag {
  display: inline-block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--f-mono);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-dust);
  border-left: 1px solid rgba(155, 168, 189, 0.3);
  padding-left: 8px;
  user-select: none;
}

.tag {
  display: inline-block;
  padding: 5px 14px;
  border-radius: var(--r-pill);
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.25);
  color: var(--c-cyan);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tag--orange {
  background: rgba(255, 107, 53, 0.1);
  border-color: rgba(255, 107, 53, 0.3);
  color: var(--c-meteor);
}

/* ---------- 10 媒体与装饰 ---------- */

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(145deg, var(--c-nebula), var(--c-night));
  border: 1px solid rgba(0, 229, 255, 0.1);
}

.media-frame--16-9 {
  aspect-ratio: 16 / 9;
}

.media-frame--4-5 {
  aspect-ratio: 4 / 5;
}

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

.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease);
}

.media-frame:hover img {
  transform: scale(1.02);
}

.velocity-line {
  height: 56px;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0 17px,
    rgba(0, 229, 255, 0.22) 17px 25px,
    transparent 25px 42px
  );
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 20%, #000 80%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 20%, #000 80%, transparent);
  pointer-events: none;
}

/* ---------- 11 滚动显现协议 ---------- */

html.js [data-reveal]:not([data-revealed]) {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

html.js [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

/* ---------- 12 响应式 ---------- */

@media (max-width: 1023px) {
  .gravity-footer__main {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

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

  .site-grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-grid--wide-narrow,
  .site-grid--narrow-wide {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 959px) {
  :root {
    --hdr-h: 60px;
  }

  .launch-brand__tag {
    display: none;
  }

  .orbit-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    margin: 0;
    background: var(--c-space);
    border-bottom: 1px solid rgba(0, 229, 255, 0.2);
    box-shadow: 0 16px 40px rgba(2, 8, 20, 0.55);
    padding: 10px var(--shell-gutter) 18px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0.3s;
    z-index: 90;
  }

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

  .orbit-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .orbit-nav__link {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border-radius: var(--r-sm);
    font-size: 0.9375rem;
  }

  .orbit-nav__link + .orbit-nav__link {
    border-top: 1px solid rgba(155, 168, 189, 0.08);
  }

  .nav-toggle {
    display: flex;
  }

  .return-gate {
    margin-left: auto;
  }

  .return-gate__glyph {
    display: none;
  }
}

@media (max-width: 639px) {
  .return-gate {
    font-size: 0.75rem;
    padding: 8px 14px;
  }

  .launch-header__inner {
    gap: 10px;
  }

  .launch-brand__mark {
    font-size: 1.1rem;
  }

  .gravity-footer__main {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: 52px;
  }

  .foot-brand {
    grid-column: auto;
  }

  .site-grid--2,
  .site-grid--3 {
    grid-template-columns: 1fr;
  }

  .faceout-card {
    padding: 24px;
  }
}

/* ---------- 13 动效偏好 ---------- */

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }

  html.js [data-reveal]:not([data-revealed]) {
    opacity: 1;
    transform: none;
  }
}