/* ==========================================================================
   COMPONENTS — 构成、组件、氛围
   阅读顺序:氛围层 → 预加载 → 光标 → 导航 → 首屏 → 跑马灯 → 宣言
             → 遥测 → 轨道 → 页脚 → 响应式
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 氛围层:渐变星云 + 颗粒噪点 + 技术网格
   -------------------------------------------------------------------------- */

/* 星云:两团大尺寸径向渐变,模糊后铺底 */
.atmosphere::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(58rem 40rem at 8% -6%,  rgba(47, 107, 255, 0.20), transparent 60%),
    radial-gradient(46rem 34rem at 96% 8%,  rgba(255, 90, 31, 0.11), transparent 58%),
    radial-gradient(70rem 50rem at 50% 120%, rgba(47, 107, 255, 0.13), transparent 62%);
}

/* 颗粒:SVG feTurbulence 生成的噪点叠加 */
.grain::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 40;
  pointer-events: none;
  opacity: 0.045;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* 技术网格:极低透明度的刻度线,径向遮罩让边缘消散 */
.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    linear-gradient(to right,  var(--color-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--color-line) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: radial-gradient(70% 60% at 50% 40%, #000 0%, transparent 100%);
  mask-image: radial-gradient(70% 60% at 50% 40%, #000 0%, transparent 100%);
}

/* 星空 canvas */
.starfield {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   2. 预加载序列
   -------------------------------------------------------------------------- */
.preloader {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  background: var(--color-bg);
  transition: opacity var(--dur-slow) var(--ease-out),
              visibility 0s linear var(--dur-slow);
}

.preloader.is-done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preloader__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  width: min(320px, 70vw);
}

.preloader__label { color: var(--color-muted); }

.preloader__bar {
  position: relative;
  width: 100%;
  height: 1px;
  background: var(--color-line);
  overflow: hidden;
}

.preloader__bar span {
  position: absolute;
  inset: 0;
  transform-origin: left center;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--color-accent), var(--color-heat));
  transition: transform 120ms linear;
}

.preloader__pct {
  color: var(--color-text);
  font-size: var(--fs-mono);
}

/* --------------------------------------------------------------------------
   3. 自定义光标(仅指针设备)
   -------------------------------------------------------------------------- */
.cursor,
.cursor-ring {
  position: fixed;
  top: 0; left: 0;
  z-index: 90;
  pointer-events: none;
  border-radius: 50%;
  mix-blend-mode: difference;
}

.cursor {
  width: 6px; height: 6px;
  margin: -3px 0 0 -3px;
  background: #fff;
}

.cursor-ring {
  width: 40px; height: 40px;
  margin: -20px 0 0 -20px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  transition: width var(--dur-base) var(--ease-out),
              height var(--dur-base) var(--ease-out),
              margin var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}

/* 悬停可交互元素:光环张开 */
.cursor-ring.is-active {
  width: 64px; height: 64px;
  margin: -32px 0 0 -32px;
  border-color: rgba(255, 255, 255, 0.9);
}

@media (hover: none), (pointer: coarse) {
  .cursor,
  .cursor-ring { display: none; }
}

/* --------------------------------------------------------------------------
   4. 左侧滚动刻度轨
   -------------------------------------------------------------------------- */
.rail {
  position: fixed;
  top: 50%;
  left: calc(var(--page-pad) * 0.4);
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  transform: translateY(-50%);
}

.rail__idx,
.rail__total { color: var(--color-faint); }

.rail__idx { color: var(--color-text); }

.rail__line {
  position: relative;
  width: 1px;
  height: 120px;
  background: var(--color-line);
}

.rail__fill {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  transform: scaleY(0);
  transform-origin: top center;
  background: linear-gradient(180deg, var(--color-accent), var(--color-heat));
}

@media (max-width: 900px) { .rail { display: none; } }

/* --------------------------------------------------------------------------
   5. 顶部导航
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0; left: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  width: 100%;
  height: var(--nav-h);
  padding: 0 var(--page-pad);
  transition: background-color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              backdrop-filter var(--dur-base) var(--ease-out);
  border-bottom: 1px solid transparent;
}

/* 滚动后凝为毛玻璃栏 */
.nav.is-stuck {
  background: rgba(5, 6, 10, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--color-line);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 44px;
}

.brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border: 1px solid var(--color-line-strong);
  border-radius: 50%;
  transition: border-color var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}

.brand:hover .brand__mark {
  border-color: var(--color-line-accent);
  box-shadow: 0 0 22px var(--glow-accent-soft);
}

/* 陀螺标记:两个反向旋转的椭圆环 + 核心点 */
.mark-ring {
  position: absolute;
  top: 50%; left: 50%;
  width: 19px; height: 19px;
  margin: -9.5px 0 0 -9.5px;
  border: 1px solid var(--color-accent-soft);
  border-radius: 50%;
  animation: gyroA 14s linear infinite;
}

.mark-ring--b {
  border-color: var(--color-heat-soft);
  animation: gyroB 18s linear infinite;
}

.mark-core {
  position: relative;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--color-text);
  box-shadow: 0 0 10px var(--color-accent-soft);
}

.brand__name {
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.16em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.nav__links a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: var(--fs-sm);
  color: var(--color-muted);
  transition: color var(--dur-fast) ease-out;
}

/* 下划线扫过 */
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--color-text);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform var(--dur-base) var(--ease-out);
}

.nav__links a:hover { color: var(--color-text); }
.nav__links a:hover::after { transform: scaleX(1); transform-origin: left center; }

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0 var(--space-4);
  font-size: var(--fs-sm);
  letter-spacing: 0.06em;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  transition: border-color var(--dur-base) var(--ease-out),
              background-color var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out);
}

.nav__cta:hover {
  border-color: var(--color-line-accent);
  background: rgba(47, 107, 255, 0.12);
}

.nav__cta-arrow {
  transition: transform var(--dur-base) var(--ease-out);
}

.nav__cta:hover .nav__cta-arrow { transform: translateX(4px); }

.nav__toggle { display: none; }

@media (max-width: 860px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }

  .nav__toggle {
    display: grid;
    place-items: center;
    width: 44px; height: 44px;
    border: 1px solid var(--color-line-strong);
    border-radius: 50%;
  }

  .nav__toggle span,
  .nav__toggle span::before,
  .nav__toggle span::after {
    display: block;
    width: 15px; height: 1px;
    background: var(--color-text);
    transition: transform var(--dur-base) var(--ease-out);
  }

  .nav__toggle span { position: relative; }
  .nav__toggle span::before,
  .nav__toggle span::after {
    content: "";
    position: absolute;
    left: 0;
  }
  .nav__toggle span::before { top: -5px; }
  .nav__toggle span::after  { top: 5px; }
}

/* --------------------------------------------------------------------------
   6. 首屏 Hero — 非对称:文字压住热核,热核破出右边界
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100svh;
  padding: calc(var(--nav-h) + var(--space-6)) var(--page-pad) var(--space-7);
  overflow: hidden;
}

.hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
}

/* 眉标:在线状态点 + 遥测文字 */
.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  color: var(--color-muted);
}

.pulse-dot {
  position: relative;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--color-accent-soft);
  box-shadow: 0 0 12px var(--glow-accent);
}

.pulse-dot::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid var(--color-accent-soft);
  animation: ping 2.4s var(--ease-out) infinite;
}

/* 品牌字样:巨大、负字距,热量沿字形流动 */
.wordmark {
  display: flex;
  flex-wrap: nowrap;
  font-family: "Noto Sans SC", sans-serif;
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: var(--lh-tight);
  letter-spacing: -0.015em;
  filter: drop-shadow(0 0 42px rgba(47, 107, 255, 0.28));
}

.wordmark__ch {
  display: inline-block;
  background-image: linear-gradient(
    100deg,
    #eef2f8 0%, #eef2f8 30%, #7ba2ff 44%, #ffb98a 52%, #eef2f8 66%, #eef2f8 100%
  );
  background-size: 300% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  animation: heatFlow 4.4s var(--ease-in-out) infinite;
  animation-delay: calc(var(--i, 0) * 0.32s);
}

/* 拉丁副标:极宽字距,拉开节奏 */
.hero__latin {
  margin-top: var(--space-4);
  color: var(--color-faint);
  font-size: var(--fs-mono);
  letter-spacing: var(--track-wider);
  text-transform: uppercase;
}

.hero__divider {
  position: relative;
  width: min(560px, 100%);
  height: 1px;
  margin-top: var(--space-5);
  background: var(--color-line);
}

/* 分隔线左端的强调色短标(呼应参考站的做法) */
.hero__divider::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: 64px; height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-heat));
  border-radius: var(--radius-pill);
}

.hero__tagline {
  max-width: 34ch;
  margin-top: var(--space-5);
  font-size: clamp(1.05rem, 1.7vw, 1.4rem);
  line-height: 1.6;
  color: var(--color-muted);
  font-weight: 400;
}

.hero__tagline em {
  font-style: normal;
  color: var(--color-text);
  font-weight: 700;
}

/* 行动区 */
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 52px;
  padding: 0 var(--space-5);
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  overflow: hidden;
  border-radius: var(--radius-pill);
  isolation: isolate;
}

/* 背景擦除:从左侧滑入 */
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(100deg, var(--color-accent), #4d7dff);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-base) var(--ease-out);
}

.btn__arrow { transition: transform var(--dur-base) var(--ease-out); }

.btn--primary {
  color: #fff;
  border: 1px solid var(--color-line-accent);
}

.btn--primary::before { transform: scaleX(1); transform-origin: left center; }

.btn--primary:hover::before {
  transform: scaleX(0);
  transform-origin: right center;
}

.btn--primary:hover { color: var(--color-text); }

.btn--ghost {
  color: var(--color-muted);
  border: 1px solid var(--color-line);
}

.btn--ghost:hover { color: var(--color-text); border-color: var(--color-line-strong); }
.btn--ghost:hover::before { transform: scaleX(1); }

.btn:hover .btn__arrow { transform: translateX(5px); }

/* 热核:冷虚空里的一颗炽热星球,破出右边界 */
.hero__core {
  position: absolute;
  top: 50%;
  right: calc(var(--page-pad) * -0.5);
  z-index: 1;
  width: clamp(280px, 44vw, 660px);
  aspect-ratio: 1;
  transform: translateY(-50%);
  pointer-events: none;
}

.core {
  position: absolute;
  inset: 14%;
  border-radius: 50%;
  background:
    radial-gradient(
      circle at 34% 28%,
      var(--color-heat-core) 0%,
      #ffc389 8%,
      var(--color-heat) 20%,
      #a82c00 38%,
      #3d1206 56%,
      #0d1018 74%,
      #05060a 88%
    );
  box-shadow:
    0 0 90px 6px var(--glow-heat),
    0 0 240px 40px rgba(47, 107, 255, 0.16),
    inset -24px -18px 70px rgba(5, 6, 10, 0.9);
  animation: coreBreathe 11s var(--ease-in-out) infinite;
}

/* 冷侧边缘光:与热核形成冷暖对撞 */
.core::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 76% 74%, rgba(47, 107, 255, 0.6), transparent 46%);
  mix-blend-mode: screen;
  filter: blur(10px);
}

/* 热浪:旋转的锥形渐变,像核心外的日冕 */
.core::after {
  content: "";
  position: absolute;
  inset: -6%;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    transparent 0deg 200deg,
    rgba(255, 164, 107, 0.55) 250deg,
    transparent 300deg 360deg
  );
  filter: blur(16px);
  opacity: 0.7;
  animation: spin 26s linear infinite;
}

/* 轨道系统(内含 SMIL 旋转) */
.core__orbits {
  position: absolute;
  inset: 0;
  overflow: visible;
}

.orbit__track {
  fill: none;
  stroke: var(--color-orbit-soft);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.orbit__track--dash {
  stroke-dasharray: 2 8;
  stroke: var(--color-orbit);
}

.orbit__track--soft { stroke: var(--color-orbit-faint); }

/* 卫星节点:自带一枚小光晕,保证在深空底上可辨 */
.orbit__node {
  fill: var(--color-accent-soft);
  filter: drop-shadow(0 0 5px rgba(123, 162, 255, 0.85));
}

.orbit__node--heat {
  fill: var(--color-heat-soft);
  filter: drop-shadow(0 0 6px rgba(255, 90, 31, 0.9));
}

/* 星座网格:节点之间的通路,即"网络"本身 */
.orbit__mesh {
  fill: none;
  stroke: var(--color-orbit);
  stroke-width: 1;
}

/* vector-effect 不可继承,需逐条线上声明 */
.orbit__mesh line { vector-effect: non-scaling-stroke; }

/* 网络辐条:由核心射向节点 */
.orbit__spoke {
  stroke: var(--color-accent);
  stroke-width: 1;
  stroke-opacity: 0.42;
  vector-effect: non-scaling-stroke;
}

.orbit__halo { opacity: 0.85; }

/* 滚动指示 */
.hero__scroll {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-7);
  color: var(--color-faint);
  font-size: var(--fs-mono);
  letter-spacing: var(--track-wide);
}

.hero__scroll-line {
  position: relative;
  width: 1px;
  height: 46px;
  background: var(--color-line);
  overflow: hidden;
}

.hero__scroll-line::after {
  content: "";
  position: absolute;
  top: -50%; left: 0;
  width: 100%; height: 50%;
  background: var(--color-accent-soft);
  animation: scrollCue 2.6s var(--ease-in-out) infinite;
}

@media (max-width: 980px) {
  .hero__core {
    top: 34%;
    right: -22%;
    width: min(78vw, 520px);
    opacity: 0.85;
  }
}

@media (max-width: 620px) {
  .hero { padding-bottom: var(--space-6); }
  .hero__core { top: 26%; right: -30%; opacity: 0.6; }
  .hero__scroll { margin-top: var(--space-6); }
  .btn { width: 100%; justify-content: center; }
}

/* --------------------------------------------------------------------------
   7. 跑马灯 — 关键词斜带
   -------------------------------------------------------------------------- */
.marquee {
  position: relative;
  z-index: 3;
  display: flex;
  padding: var(--space-5) 0;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: rgba(8, 9, 15, 0.6);
  overflow: hidden;
  transform: rotate(-1.2deg) scale(1.04);
}

.marquee__track {
  display: flex;
  flex-shrink: 0;
  gap: var(--space-6);
  padding-right: var(--space-6);
  animation: marquee 34s linear infinite;
}

.marquee__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--fs-lg);
  font-weight: 900;
  letter-spacing: 0.04em;
  white-space: nowrap;
  color: var(--color-faint);
}

/* 交替高亮:让斜带形成冷热节奏 */
.marquee__item:nth-child(3n + 1) { color: var(--color-text); }
.marquee__item:nth-child(3n + 2) { color: var(--color-accent-soft); }

.marquee__item::after {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-heat);
  box-shadow: 0 0 12px var(--glow-heat);
}

/* --------------------------------------------------------------------------
   8. 宣言 — 一整句,逐字揭示
   -------------------------------------------------------------------------- */
.statement {
  position: relative;
  z-index: 2;
  padding: var(--space-8) var(--page-pad);
}

.statement__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.statement__label {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  color: var(--color-faint);
}

.statement__label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-line);
}

.statement__text {
  font-size: clamp(1.75rem, 5.4vw, 4.5rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: var(--track-tight);
  text-wrap: balance;
}

/* 宣言中的关键词用冷暖渐变点题 */
.statement__text .hot {
  background-image: linear-gradient(96deg, var(--color-accent-soft), var(--color-heat-soft));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

/* --------------------------------------------------------------------------
   9. 遥测数据带
   -------------------------------------------------------------------------- */
.telemetry {
  position: relative;
  z-index: 2;
  padding: 0 var(--page-pad) var(--space-8);
}

.telemetry__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  max-width: var(--max-w);
  margin: 0 auto;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}

.telemetry__cell {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-5);
  background: var(--color-bg);
  transition: background-color var(--dur-base) var(--ease-out);
}

.telemetry__cell:hover { background: var(--color-surface); }

.telemetry__value {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: var(--track-tight);
  font-variant-numeric: tabular-nums;
}

.telemetry__unit {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-accent-soft);
  letter-spacing: 0.1em;
}

.telemetry__bar {
  position: relative;
  height: 1px;
  background: var(--color-line);
  overflow: hidden;
}

.telemetry__bar span {
  position: absolute;
  inset: 0;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--color-accent), var(--color-heat));
  transition: transform var(--dur-scene) var(--ease-out) 200ms;
}

.telemetry__cell.is-in .telemetry__bar span { transform: scaleX(1); }

@media (max-width: 760px) {
  .telemetry__grid { grid-template-columns: 1fr; }
}

/* --------------------------------------------------------------------------
   10. 轨道 — 页面中枢:网络图形
   -------------------------------------------------------------------------- */
.orbit-sec {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--space-6);
  /* 版心:本节的栅格即内容容器(无内层 wrapper),故用
     max-w + 双侧 page-pad 的等价值自居中,
     使内容左边缘与 hero / statement / telemetry / footer 严格对齐 */
  max-width: calc(var(--max-w) + var(--page-pad) * 2);
  margin-inline: auto;
  padding: var(--space-8) var(--page-pad);
  overflow: hidden;
}

.orbit-sec__copy {
  max-width: 34ch;
}

.orbit-sec__index {
  display: block;
  margin-bottom: var(--space-4);
  color: var(--color-faint);
}

.orbit-sec__title {
  font-size: clamp(2rem, 4.6vw, 3.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: var(--track-tight);
}

.orbit-sec__title span {
  display: block;
  background-image: linear-gradient(96deg, var(--color-text) 30%, var(--color-accent-soft));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.orbit-sec__desc {
  margin-top: var(--space-4);
  color: var(--color-muted);
}

.orbit-sec__legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-line);
}

.orbit-sec__legend li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  color: var(--color-muted);
}

.orbit-sec__legend i {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-accent-soft);
}

.orbit-sec__legend li:nth-child(2) i { background: var(--color-heat); }
.orbit-sec__legend li:nth-child(3) i { background: var(--color-faint); }

.orbit-sec__stage {
  position: relative;
  justify-self: center;
  width: min(100%, 620px);
  aspect-ratio: 1;
}

/* 舞台背光 */
.orbit-sec__stage::before {
  content: "";
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 107, 255, 0.22), transparent 66%);
  filter: blur(30px);
}

.orbit-sec__svg { position: relative; width: 100%; height: 100%; }

.orbit-sec__hub {
  position: absolute;
  top: 50%; left: 50%;
  width: 9%;
  aspect-ratio: 1;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle at 38% 34%, #fff, var(--color-accent-soft) 42%, var(--color-accent));
  box-shadow: 0 0 34px var(--glow-accent), 0 0 90px rgba(47, 107, 255, 0.35);
  animation: coreBreathe 6s var(--ease-in-out) infinite;
}

/* 图注:环绕舞台的四个遥测刻度 */
.orbit-sec__tick {
  position: absolute;
  color: var(--color-faint);
  font-size: var(--fs-mono);
  letter-spacing: var(--track-wide);
}

.orbit-sec__tick--tl { top: 2%;  left: 0; }
.orbit-sec__tick--tr { top: 2%;  right: 0; }
.orbit-sec__tick--bl { bottom: 2%; left: 0; }
.orbit-sec__tick--br { bottom: 2%; right: 0; }

@media (max-width: 900px) {
  .orbit-sec {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  .orbit-sec__copy { max-width: 100%; }
}

/* --------------------------------------------------------------------------
   11. 业务范围 — 只列名称,不做一句描述
   -------------------------------------------------------------------------- */
.scope {
  position: relative;
  z-index: 2;
  /* 上间距 = 下间距 + 页脚上内边距,使"网络 → 业务 → 页脚"两侧留白对称 */
  padding: var(--space-7) var(--page-pad) var(--space-8);
}

.scope__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.scope__label {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-7);
  color: var(--color-faint);
}

.scope__label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-line);
}

.scope__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-7) var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.scope__cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-top: var(--space-5);
}

/* 顶栏发丝线:揭示时自左向右画出,悬停时"升温"成冷暖热流 —— 呼应导热 */
.scope__cell::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  transform: scaleX(0);
  transform-origin: left center;
  background: var(--color-line-strong);
  transition: transform var(--dur-scene) var(--ease-out),
              background var(--dur-base) var(--ease-out);
}

.scope__cell.is-in::before { transform: scaleX(1); }

.scope__cell:hover::before {
  background: linear-gradient(90deg, var(--color-accent), var(--color-heat));
}

.scope__num {
  color: var(--color-faint);
  font-size: var(--fs-mono);
  letter-spacing: var(--track-wide);
  transition: color var(--dur-base) var(--ease-out);
}

.scope__cell:hover .scope__num { color: var(--color-heat-soft); }

.scope__name {
  font-size: clamp(1.375rem, 2.2vw, 1.875rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: var(--track-tight);
  color: var(--color-text);
}

.scope__en {
  color: var(--color-faint);
  font-size: var(--fs-mono);
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
}

@media (max-width: 1000px) {
  .scope__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 520px) {
  .scope__grid { grid-template-columns: 1fr; gap: var(--space-6); }
}

/* --------------------------------------------------------------------------
   12. 页脚 / 联络
   -------------------------------------------------------------------------- */
.footer {
  position: relative;
  z-index: 2;
  padding: var(--space-7) var(--page-pad) var(--space-5);
  border-top: 1px solid var(--color-line);
  background: linear-gradient(180deg, transparent, rgba(47, 107, 255, 0.05));
  overflow: hidden;
}

.footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.footer__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-5);
}

.footer__label {
  margin-bottom: var(--space-3);
  color: var(--color-faint);
}

.footer__mail {
  position: relative;
  display: inline-block;
  font-size: clamp(1.4rem, 3.6vw, 2.6rem);
  font-weight: 900;
  letter-spacing: var(--track-tight);
  background-image: linear-gradient(96deg, var(--color-text), var(--color-accent-soft));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.footer__mail::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 100%; height: 1px;
  background: var(--color-accent-soft);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform var(--dur-base) var(--ease-out);
}

.footer__mail:hover::after { transform: scaleX(1); transform-origin: left center; }

/* 描边巨字:像图章一样压在页脚 */
.footer__stamp {
  margin-top: var(--space-6);
  font-size: clamp(4rem, 19vw, 17rem);
  font-weight: 900;
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px var(--color-line-strong);
  user-select: none;
  white-space: nowrap;
  transition: -webkit-text-stroke-color var(--dur-slow) var(--ease-out);
}

.footer:hover .footer__stamp { -webkit-text-stroke-color: var(--color-line-accent); }

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-line);
  color: var(--color-faint);
  font-size: var(--fs-xs);
}

.footer__links {
  display: flex;
  gap: var(--space-4);
}

.footer__links a {
  transition: color var(--dur-fast) ease-out;
}

.footer__links a:hover { color: var(--color-text); }

@media (max-width: 620px) {
  .footer__stamp {
    font-size: clamp(3.4rem, 22vw, 6rem);
    white-space: normal;
  }
}

/* --------------------------------------------------------------------------
   12. 移动端全屏菜单
   -------------------------------------------------------------------------- */
.menu {
  position: fixed;
  inset: 0;
  z-index: 25;
  display: grid;
  align-content: center;
  gap: var(--space-6);
  padding: var(--nav-h) var(--page-pad) var(--space-6);
  background: rgba(5, 6, 10, 0.94);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease-out),
              visibility 0s linear var(--dur-base);
}

.menu.is-open {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--dur-base) var(--ease-out);
}

.menu__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.menu__link {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--fs-xl);
  font-weight: 900;
  letter-spacing: var(--track-tight);
  border-bottom: 1px solid var(--color-line);
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
}

.menu.is-open .menu__link { opacity: 1; transform: none; }
.menu.is-open .menu__link:nth-child(1) { transition-delay: 80ms; }
.menu.is-open .menu__link:nth-child(2) { transition-delay: 140ms; }
.menu.is-open .menu__link:nth-child(3) { transition-delay: 200ms; }

.menu__link:hover { color: var(--color-accent-soft); }

/* 汉堡按钮展开为关闭态 */
.nav__toggle.is-open span { background: transparent; }
.nav__toggle.is-open span::before { transform: translateY(5px) rotate(45deg); }
.nav__toggle.is-open span::after  { transform: translateY(-5px) rotate(-45deg); }

/* --------------------------------------------------------------------------
   13. 关键帧
   -------------------------------------------------------------------------- */
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 陀螺标记的两个环:先压扁成椭圆,再整体旋转 */
@keyframes gyroA {
  from { transform: rotate(0deg) scaleY(0.42); }
  to   { transform: rotate(360deg) scaleY(0.42); }
}

@keyframes gyroB {
  from { transform: rotate(0deg) scaleX(0.42); }
  to   { transform: rotate(-360deg) scaleX(0.42); }
}

@keyframes ping {
  0%   { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.4); opacity: 0; }
}

/* 热量沿字形流动 */
@keyframes heatFlow {
  0%   { background-position: 200% 0; }
  55%  { background-position: -60% 0; }
  100% { background-position: -60% 0; }
}

/* 热核呼吸:亮度与尺度同步起伏 */
@keyframes coreBreathe {
  0%, 100% { transform: scale(1); filter: brightness(1); }
  50%      { transform: scale(1.035); filter: brightness(1.14); }
}

@keyframes marquee {
  to { transform: translateX(-100%); }
}

@keyframes scrollCue {
  0%   { transform: translateY(0); opacity: 0; }
  35%  { opacity: 1; }
  100% { transform: translateY(300%); opacity: 0; }
}