/* ============================ 2.5D 航天首页 ============================ */
#start-overlay {
  --home-cyan: #8edfff;
  --home-cyan-strong: #d7f5ff;
  --home-blue: #4cb8ec;
  --home-magenta: #da4cf0;
  display: block;
  min-height: 100svh;
  background: #02070d;
  transition: opacity 0.65s cubic-bezier(0.65, 0, 0.35, 1);
}

#start-overlay::before { display: none; }

#start-overlay .home-scene,
#start-overlay .home-backdrop,
#start-overlay .home-star-canvas,
#start-overlay .home-atmosphere,
#start-overlay .home-scanline {
  position: absolute;
  inset: 0;
}

#start-overlay .home-scene {
  z-index: 0;
  overflow: hidden;
  background: #02070d;
  transform-origin: 50% 50%;
}

#start-overlay .home-backdrop {
  background-image:
    linear-gradient(90deg, rgba(1, 7, 13, 0.24), transparent 42%),
    url('../textures/home-layers/space-background.png');
  background-position: center;
  background-size: cover;
  will-change: transform, opacity;
}

#start-overlay .home-star-canvas {
  z-index: 1;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#start-overlay .home-layer {
  position: absolute;
  z-index: 3;
  pointer-events: none;
  will-change: transform, opacity;
}

#start-overlay .home-layer img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  pointer-events: none;
  will-change: transform;
  filter: drop-shadow(0 0 18px rgba(72, 157, 213, 0.12));
}

#start-overlay .home-layer--earth {
  right: -7vw;
  bottom: -5vw;
  z-index: 2;
  width: min(69vw, 1290px);
}

#start-overlay .home-layer--earth img {
  filter: drop-shadow(-12px -9px 25px rgba(79, 169, 239, 0.28));
}

#start-overlay .home-layer--tiangong {
  top: 3vh;
  right: 3.5vw;
  z-index: 4;
  width: min(15.5vw, 292px);
}

#start-overlay .home-layer--shenzhou {
  top: 42%;
  left: 44.5%;
  z-index: 5;
  width: min(19vw, 355px);
}

#start-overlay .home-layer--shenzhou img {
  filter: brightness(0.96) contrast(1.04) drop-shadow(0 0 12px rgba(88, 158, 210, 0.18));
}

#start-overlay .home-layer--dongfanghong {
  left: 43.5%;
  bottom: 6vh;
  z-index: 6;
  width: min(11.5vw, 216px);
}

#start-overlay .home-layer--change {
  top: 40%;
  right: 6vw;
  z-index: 5;
  width: min(10.5vw, 198px);
}

#start-overlay .home-layer--astronaut {
  top: 16%;
  right: 13.5%;
  z-index: 7;
  width: min(31vw, 582px);
}

#start-overlay .home-layer--astronaut img {
  filter:
    drop-shadow(0 0 9px rgba(188, 231, 255, 0.8))
    drop-shadow(0 0 24px rgba(68, 170, 237, 0.48));
}

/* 用尺寸、清晰度、亮度和视差速度共同建立近中远空间层级。 */
#start-overlay .home-depth--far img {
  opacity: 0.68;
  filter: saturate(0.68) brightness(0.78) contrast(0.94) blur(0.3px)
    drop-shadow(0 0 8px rgba(78, 145, 188, 0.12));
}

#start-overlay .home-depth--mid img {
  opacity: 0.9;
  filter: saturate(0.86) brightness(0.92) contrast(1.02)
    drop-shadow(0 0 13px rgba(77, 159, 211, 0.18));
}

#start-overlay .home-depth--near img {
  opacity: 1;
  filter:
    saturate(1.04) brightness(1.06) contrast(1.04)
    drop-shadow(0 0 9px rgba(188, 231, 255, 0.82))
    drop-shadow(0 0 28px rgba(68, 170, 237, 0.5));
}

#start-overlay .home-atmosphere {
  z-index: 8;
  pointer-events: none;
  background:
    radial-gradient(circle at 68% 48%, rgba(85, 180, 239, 0.09), transparent 25%),
    radial-gradient(ellipse at 50% 115%, rgba(39, 117, 177, 0.12), transparent 43%),
    linear-gradient(90deg, rgba(0, 6, 12, 0.2), transparent 36%, transparent 77%, rgba(0, 4, 8, 0.14));
  box-shadow: inset 0 0 12vw rgba(0, 0, 0, 0.5);
}

#start-overlay .home-scanline {
  top: -125%;
  z-index: 9;
  height: 44%;
  pointer-events: none;
  opacity: 0.2;
  background: linear-gradient(to bottom, transparent, rgba(109, 214, 255, 0.11), transparent);
  will-change: transform;
}

#start-overlay .home-frame {
  position: absolute;
  inset: clamp(18px, 2.5vw, 46px);
  z-index: 12;
  pointer-events: none;
}

#start-overlay .home-corner {
  position: absolute;
  width: clamp(86px, 11vw, 190px);
  height: clamp(86px, 14vh, 145px);
  opacity: 0.82;
  filter: drop-shadow(0 0 5px rgba(90, 201, 255, 0.25));
}

#start-overlay .home-corner::after {
  content: '';
  position: absolute;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #e5f9ff;
  box-shadow: 27px 0 0 rgba(91, 203, 255, 0.65), 61px 0 0 rgba(255, 255, 255, 0.45);
}

#start-overlay .home-corner--tl {
  top: 0;
  left: 0;
  border-top: 1px solid rgba(133, 222, 255, 0.72);
  border-left: 1px solid rgba(133, 222, 255, 0.72);
  clip-path: polygon(0 0, 100% 0, 100% 8%, 16% 8%, 8% 16%, 8% 100%, 0 100%);
}

#start-overlay .home-corner--tl::after { top: -2px; right: 2px; }

#start-overlay .home-corner--tr {
  top: 0;
  right: 0;
  border-top: 1px solid rgba(133, 222, 255, 0.3);
  border-right: 1px solid rgba(133, 222, 255, 0.3);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 92% 100%, 92% 16%, 84% 8%, 0 8%);
}

#start-overlay .home-corner--tr::after { top: -2px; left: 2px; }

#start-overlay .home-corner--bl {
  bottom: 0;
  left: 0;
  border-bottom: 1px solid rgba(133, 222, 255, 0.72);
  border-left: 1px solid rgba(133, 222, 255, 0.72);
  clip-path: polygon(0 0, 8% 0, 8% 84%, 16% 92%, 100% 92%, 100% 100%, 0 100%);
}

#start-overlay .home-corner--bl::after { bottom: -2px; right: 2px; }

#start-overlay .home-corner--br {
  right: 0;
  bottom: 0;
  border-right: 1px solid rgba(133, 222, 255, 0.25);
  border-bottom: 1px solid rgba(133, 222, 255, 0.25);
  clip-path: polygon(92% 0, 100% 0, 100% 100%, 0 100%, 0 92%, 84% 92%, 92% 84%);
}

#start-overlay .home-corner--br::after { bottom: -2px; left: 2px; }

#start-overlay .home-frame-tick--left {
  position: absolute;
  top: 42%;
  left: 3px;
  width: 1px;
  height: 22%;
  opacity: 0.65;
  background: repeating-linear-gradient(to bottom, rgba(120, 216, 255, 0.75) 0 2px, transparent 2px 10px);
}

#start-overlay .home-copy {
  position: absolute;
  top: 27%;
  left: clamp(70px, 11vw, 210px);
  z-index: 20;
  width: min(33vw, 620px);
  max-width: none;
  padding: 0;
  text-align: center;
}

#start-overlay .home-kicker {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  width: 88%;
  margin: 0 auto 1.2vh;
  color: rgba(143, 215, 243, 0.62);
  font-family: Consolas, "SFMono-Regular", monospace;
  font-size: clamp(8px, 0.58vw, 11px);
  letter-spacing: 0.17em;
  text-align: left;
}

#start-overlay .home-kicker i {
  height: 1px;
  background: linear-gradient(90deg, rgba(111, 211, 250, 0.54), rgba(218, 76, 240, 0.5));
}

#start-overlay .home-title-shell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: clamp(104px, 9vw, 168px);
  perspective: 700px;
}

#start-overlay .start-title {
  position: relative;
  z-index: 2;
  display: inline-block;
  margin: 0;
  font-family: "Microsoft YaHei UI", "PingFang SC", sans-serif;
  font-size: clamp(76px, 7.4vw, 142px);
  font-weight: 900;
  line-height: 0.96;
  letter-spacing: -0.08em;
  text-indent: 0;
  color: transparent;
  background:
    repeating-linear-gradient(180deg,
      #e5f8ff 0 2px,
      #8bc6de 2px 4px,
      rgba(33, 94, 124, 0.8) 4px 7px);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-stroke: clamp(1px, 0.1vw, 1.8px) rgba(208, 244, 255, 0.94);
  text-shadow:
    0 0 7px rgba(142, 223, 255, 0.76),
    0 0 20px rgba(63, 170, 226, 0.48),
    3px 4px 0 rgba(8, 35, 51, 0.94);
  filter: drop-shadow(0 7px 0 rgba(23, 62, 79, 0.34));
}

#start-overlay .start-title::before,
#start-overlay .start-title::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  pointer-events: none;
}

#start-overlay .start-title::before {
  z-index: -1;
  color: transparent;
  -webkit-text-stroke: 5px rgba(68, 181, 228, 0.22);
  filter: blur(5px);
}

#start-overlay .start-title::after {
  z-index: 3;
  color: transparent;
  -webkit-text-stroke: 1px rgba(225, 78, 243, 0.72);
  clip-path: polygon(0 16%, 100% 16%, 100% 24%, 0 24%, 0 63%, 100% 63%, 100% 69%, 0 69%);
  transform: translateX(3px);
  opacity: 0.6;
}

#start-overlay .home-title-shell::after {
  content: '';
  position: absolute;
  right: 12%;
  bottom: 12%;
  width: 20%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--home-magenta));
  box-shadow: 0 0 8px rgba(218, 76, 240, 0.5);
  transform: skewX(-38deg);
}

#start-overlay .home-title-index {
  position: absolute;
  top: 12%;
  right: 8%;
  padding-left: 10px;
  border-left: 1px solid rgba(116, 213, 251, 0.46);
  color: rgba(183, 232, 249, 0.55);
  font: 10px/1 Consolas, monospace;
  letter-spacing: 0.16em;
}

#start-overlay .home-title-bracket {
  position: absolute;
  top: 6%;
  width: 11%;
  height: 82%;
  opacity: 0.75;
}

#start-overlay .home-title-bracket--left {
  left: 0;
  border-top: 1px solid rgba(138, 224, 255, 0.75);
  border-left: 1px solid rgba(138, 224, 255, 0.45);
  clip-path: polygon(0 0, 100% 0, 100% 4%, 18% 4%, 4% 18%, 4% 82%, 18% 96%, 42% 96%, 42% 100%, 0 100%);
}

#start-overlay .home-title-bracket--right {
  right: 0;
  border-right: 1px solid rgba(138, 224, 255, 0.45);
  border-bottom: 1px solid rgba(138, 224, 255, 0.75);
  clip-path: polygon(58% 0, 100% 0, 100% 100%, 0 100%, 0 96%, 82% 96%, 96% 82%, 96% 18%, 82% 4%, 58% 4%);
}

#start-overlay .home-title-meta {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  width: 64%;
  margin: -0.5vh auto 0;
  color: rgba(142, 210, 238, 0.55);
  font: clamp(8px, 0.62vw, 11px)/1 Consolas, "SFMono-Regular", monospace;
  letter-spacing: 0.21em;
}

#start-overlay .home-title-meta b {
  height: 1px;
  background: repeating-linear-gradient(90deg, rgba(99, 200, 240, 0.6) 0 8px, transparent 8px 12px);
}

#start-overlay .start-subtitle {
  position: relative;
  width: 94%;
  margin: 2vh auto 0;
  padding: 0.9vh 0 0.95vh;
  border-top: 1px solid rgba(105, 200, 239, 0.13);
  border-bottom: 1px solid rgba(105, 200, 239, 0.13);
  background: linear-gradient(90deg, transparent, rgba(50, 138, 177, 0.08), transparent);
  color: rgba(227, 246, 255, 0.95);
  font-size: clamp(13px, 1.05vw, 20px);
  font-weight: 400;
  letter-spacing: 0.22em;
  text-indent: 0.22em;
  white-space: nowrap;
  text-shadow: 0 0 8px rgba(113, 215, 255, 0.7), 0 0 20px rgba(58, 155, 210, 0.38);
}

#start-overlay .start-subtitle::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -2.7vh;
  width: clamp(76px, 8vw, 132px);
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, rgba(129, 218, 255, 0.72) 28%, rgba(218, 76, 240, 0.7) 72%, transparent);
  box-shadow: 0 0 8px rgba(104, 205, 248, 0.32);
}

#start-overlay .start-btn {
  appearance: none;
  min-width: clamp(255px, 22vw, 420px);
  margin-top: clamp(42px, 7vh, 72px);
  padding: clamp(14px, 1.6vh, 20px) clamp(38px, 4vw, 76px);
  border: 1px solid rgba(154, 226, 255, 0.82);
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(15, 45, 64, 0.2), rgba(2, 13, 23, 0.72));
  color: rgba(230, 248, 255, 0.96);
  font-family: inherit;
  font-size: clamp(18px, 1.55vw, 28px);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: 0.48em;
  text-indent: 0.48em;
  text-shadow: 0 0 10px rgba(105, 214, 255, 0.8);
  box-shadow: 0 0 28px rgba(80, 196, 255, 0.25), inset 0 0 24px rgba(90, 210, 255, 0.08);
  clip-path: polygon(14px 0, calc(100% - 14px) 0, 100% 14px, 100% calc(100% - 14px), calc(100% - 14px) 100%, 14px 100%, 0 calc(100% - 14px), 0 14px);
  transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease;
  touch-action: manipulation;
}

#start-overlay .start-btn::before,
#start-overlay .start-btn::after {
  width: 25px;
  height: 9px;
  border-width: 0 0 2px 0;
  border-color: var(--home-blue);
}

#start-overlay .start-btn::before {
  top: auto;
  bottom: 4px;
  left: 12px;
  border-right: none;
  border-bottom: 2px solid var(--home-blue);
  filter: drop-shadow(0 0 4px rgba(76, 184, 236, 0.8));
}

#start-overlay .start-btn::after {
  right: 12px;
  bottom: 4px;
  border-left: none;
  border-top: none;
  border-bottom: 2px solid var(--home-magenta);
  filter: drop-shadow(0 0 4px rgba(218, 76, 240, 0.8));
}

#start-overlay .start-btn:hover,
#start-overlay .start-btn:focus-visible {
  border-color: var(--home-cyan-strong);
  color: #fff;
  outline: none;
  background: linear-gradient(180deg, rgba(29, 91, 123, 0.28), rgba(3, 18, 31, 0.82));
  box-shadow: 0 0 38px rgba(80, 196, 255, 0.48), inset 0 0 28px rgba(90, 210, 255, 0.13);
}

#start-overlay .start-btn:focus-visible {
  outline: 1px solid rgba(221, 249, 255, 0.95);
  outline-offset: 5px;
}

#start-overlay .start-hint {
  position: relative;
  width: 88%;
  margin: clamp(48px, 7.5vh, 84px) auto 0;
  color: rgba(210, 232, 242, 0.77);
  font-size: clamp(11px, 0.9vw, 16px);
  letter-spacing: 0.42em;
  text-indent: 0.42em;
  text-shadow: 0 0 8px rgba(93, 190, 235, 0.32);
}

#start-overlay .start-hint::before,
#start-overlay .start-hint::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 22%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(172, 229, 249, 0.7));
}

#start-overlay .start-hint::before { right: calc(100% + 12px); }
#start-overlay .start-hint::after {
  left: calc(100% + 12px);
  transform: scaleX(-1);
}

#start-overlay .home-motion-status {
  position: absolute;
  left: 50%;
  bottom: 4vh;
  z-index: 30;
  padding: 8px 15px;
  border: 1px solid rgba(130, 218, 255, 0.32);
  background: rgba(2, 13, 22, 0.78);
  color: rgba(218, 244, 255, 0.9);
  font-size: 12px;
  letter-spacing: 0.15em;
  opacity: 0;
  transform: translate(-50%, 8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
}

#start-overlay .home-motion-status.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

#start-overlay.motion-paused::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  background: rgba(2, 9, 15, 0.06);
}

@media (max-width: 1100px) {
  #start-overlay .home-copy {
    top: 22%;
    left: 7vw;
    width: 41vw;
  }

  #start-overlay .home-layer--astronaut {
    top: 19%;
    right: 8%;
    width: 37vw;
  }

  #start-overlay .home-layer--tiangong { width: 19vw; }
  #start-overlay .home-layer--change { right: 2vw; width: 12vw; }
  #start-overlay .home-layer--dongfanghong { width: 13vw; }
}

@media (max-width: 760px), (max-aspect-ratio: 4 / 5) {
  #start-overlay .home-copy {
    top: 12%;
    left: 8vw;
    width: 84vw;
  }

  #start-overlay .home-kicker { width: 94%; font-size: 7px; }
  #start-overlay .start-title { font-size: clamp(66px, 23vw, 112px); }
  #start-overlay .home-title-meta { width: 70%; }
  #start-overlay .start-subtitle {
    width: 92%;
    font-size: clamp(12px, 3.1vw, 18px);
    letter-spacing: 0.16em;
    text-indent: 0.16em;
  }
  #start-overlay .start-subtitle::after { bottom: -2.2vh; }
  #start-overlay .start-btn { margin-top: 5.5vh; }
  #start-overlay .start-hint { margin-top: 4.5vh; }

  #start-overlay .home-layer--astronaut {
    top: 53%;
    right: 11%;
    width: min(54vw, 390px);
  }

  #start-overlay .home-layer--earth {
    right: -24vw;
    bottom: -14vw;
    width: 108vw;
  }

  #start-overlay .home-layer--tiangong {
    top: 51%;
    right: -5%;
    width: 28vw;
  }

  #start-overlay .home-layer--dongfanghong {
    left: 5%;
    bottom: 6%;
    width: 21vw;
  }

  #start-overlay .home-layer--shenzhou,
  #start-overlay .home-layer--change { display: none; }
}

@media (max-height: 670px) and (min-width: 761px) {
  #start-overlay .home-copy { top: 22%; }
  #start-overlay .start-btn { margin-top: 6vh; }
  #start-overlay .start-hint { margin-top: 5.5vh; }
}

@media (prefers-reduced-motion: reduce) {
  #start-overlay,
  #start-overlay * {
    scroll-behavior: auto !important;
  }

  #start-overlay .home-scanline { display: none; }
}

/* ============================ 启航视频过场 ============================ */
.launch-cinematic {
  position: fixed;
  inset: 0;
  z-index: 260;
  overflow: hidden;
  background: #000;
  pointer-events: none;
  isolation: isolate;
  will-change: opacity;
}

.launch-cinematic__video {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  background: #000;
  backface-visibility: hidden;
  will-change: opacity;
}

.launch-cinematic__vignette {
  position: absolute;
  inset: 0;
  z-index: 2;
  background:
    radial-gradient(ellipse at center, transparent 52%, rgba(0, 0, 0, 0.42) 100%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.14), transparent 16%, transparent 84%, rgba(0, 0, 0, 0.2));
}

.launch-cinematic__status {
  position: absolute;
  left: 50%;
  bottom: clamp(26px, 4vh, 48px);
  z-index: 3;
  display: grid;
  grid-template-columns: auto clamp(58px, 9vw, 150px) auto;
  align-items: center;
  gap: 14px;
  color: rgba(204, 239, 252, 0.82);
  font: 10px/1 Consolas, "SFMono-Regular", monospace;
  letter-spacing: 0.24em;
  white-space: nowrap;
  transform: translateX(-50%);
  text-shadow: 0 0 8px rgba(87, 197, 241, 0.45);
}

.launch-cinematic__status i {
  height: 1px;
  background: linear-gradient(90deg, rgba(93, 206, 249, 0.12), rgba(118, 217, 255, 0.85), rgba(218, 76, 240, 0.62));
}

.launch-cinematic__blackout {
  position: absolute;
  inset: 0;
  z-index: 4;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 78%, rgba(8, 35, 55, 0.28), transparent 42%),
    #02070d;
  visibility: hidden;
  opacity: 0;
  will-change: opacity;
}

.launch-loader {
  position: absolute;
  left: 50%;
  bottom: clamp(58px, 8.8vh, 104px);
  width: min(72vw, 1180px);
  color: rgba(225, 246, 255, 0.94);
  transform: translateX(-50%);
  pointer-events: none;
  will-change: opacity, transform;
}

.launch-loader__meta {
  margin-bottom: clamp(10px, 1.4vh, 17px);
  color: rgba(137, 222, 255, 0.86);
  font: clamp(9px, 0.75vw, 12px)/1 Consolas, "SFMono-Regular", monospace;
  letter-spacing: 0.2em;
}

.launch-loader__headline {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: clamp(24px, 4vw, 72px);
}

.launch-loader__headline p {
  margin: 0;
  font-family: "Microsoft YaHei UI", "PingFang SC", sans-serif;
  font-size: clamp(23px, 2.25vw, 40px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: 0.18em;
  white-space: nowrap;
  text-shadow: 0 0 14px rgba(116, 211, 251, 0.2);
}

.launch-loader__headline output {
  color: rgba(190, 239, 255, 0.96);
  font: 300 clamp(48px, 5.1vw, 84px)/0.86 Consolas, "SFMono-Regular", monospace;
  letter-spacing: -0.08em;
  text-shadow: 0 0 18px rgba(99, 203, 246, 0.42);
}

.launch-loader__orbit {
  position: absolute;
  left: 50%;
  top: clamp(-72px, -5.8vh, -46px);
  width: 54px;
  height: 34px;
  transform: translateX(-50%);
  transform-origin: 50% 60%;
  border-top: 1px solid rgba(85, 208, 255, 0.9);
  border-radius: 50%;
  will-change: transform;
}

.launch-loader__orbit i {
  position: absolute;
  top: 18px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #78e6ff;
  box-shadow: 0 0 10px rgba(103, 226, 255, 0.75);
}

.launch-loader__orbit i:nth-child(1) { left: -2px; width: 4px; height: 4px; opacity: 0.9; }
.launch-loader__orbit i:nth-child(2) { left: 24px; top: 9px; width: 9px; height: 9px; }
.launch-loader__orbit i:nth-child(3) {
  right: -1px;
  width: 5px;
  height: 5px;
  background: #da4cf0;
  box-shadow: 0 0 10px rgba(218, 76, 240, 0.85);
}

.launch-loader__track {
  position: relative;
  height: 1px;
  margin-top: clamp(20px, 2.6vh, 30px);
  background: rgba(163, 223, 245, 0.3);
}

.launch-loader__track span {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(133, 227, 255, 0.9), rgba(190, 241, 255, 0.86));
  box-shadow: 0 0 6px rgba(108, 216, 255, 0.36);
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

.launch-loader__track > i {
  position: absolute;
  top: 50%;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #f150ff;
  box-shadow: 0 0 4px #fff, 0 0 14px rgba(233, 67, 255, 0.9);
  transform: translate(-50%, -50%);
  will-change: transform;
}

.launch-loader__copy {
  margin: clamp(25px, 3.4vh, 38px) auto 0;
  color: rgba(232, 246, 252, 0.88);
  font-family: "Microsoft YaHei UI", "PingFang SC", sans-serif;
  font-size: clamp(12px, 1.25vw, 20px);
  font-weight: 300;
  letter-spacing: 0.2em;
  text-align: center;
}

.launch-loader__motto {
  margin: clamp(10px, 1.5vh, 16px) auto 0;
  color: rgba(97, 208, 250, 0.88);
  font: clamp(8px, 0.72vw, 11px)/1 Consolas, "SFMono-Regular", monospace;
  letter-spacing: 0.62em;
  text-align: center;
}

.launch-cinematic__skip {
  position: absolute;
  left: 50%;
  bottom: clamp(8px, 1.8vh, 22px);
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateX(-50%);
  color: rgba(180, 225, 245, 0.52);
  font: 10px/1 Consolas, "SFMono-Regular", monospace;
  letter-spacing: 0.18em;
  white-space: nowrap;
  opacity: 0;
  animation: cinematic-skip-fadein 1.2s 1.6s ease forwards;
}

.launch-cinematic__skip kbd {
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid rgba(130, 215, 255, 0.45);
  border-radius: 2px;
  background: rgba(10, 35, 55, 0.5);
  color: rgba(200, 238, 255, 0.88);
  font: inherit;
  letter-spacing: 0.22em;
  text-shadow: 0 0 6px rgba(100, 200, 255, 0.5);
  box-shadow: 0 0 10px rgba(80, 190, 255, 0.15), inset 0 0 8px rgba(90, 200, 255, 0.06);
}

.launch-cinematic__skip-line {
  display: inline-block;
  width: clamp(28px, 5vw, 64px);
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(120, 210, 255, 0.4));
}

.launch-cinematic__skip-line:last-child {
  background: linear-gradient(90deg, rgba(120, 210, 255, 0.4), transparent);
}

@keyframes cinematic-skip-fadein {
  to { opacity: 1; }
}

body.launch-transition-active { cursor: none; }

body.launch-transition-active #app,
body.launch-transition-active .css2d-layer,
body.launch-transition-active #hud {
  visibility: hidden !important;
}

@media (max-width: 600px) {
  .launch-cinematic__status {
    grid-template-columns: auto 44px auto;
    gap: 9px;
    font-size: 8px;
    letter-spacing: 0.16em;
  }

  .launch-loader {
    bottom: 8vh;
    width: calc(100vw - 40px);
  }

  .launch-loader__meta { font-size: 7px; }
  .launch-loader__headline { gap: 10px; }
  .launch-loader__headline p {
    font-size: clamp(13px, 3.7vw, 18px);
    letter-spacing: 0.08em;
  }
  .launch-loader__headline output { font-size: clamp(34px, 11vw, 52px); }
  .launch-loader__orbit { top: -42px; transform: translateX(-50%) scale(0.78); }
  .launch-loader__track { margin-top: 18px; }
  .launch-loader__copy {
    margin-top: 24px;
    font-size: clamp(9px, 2.7vw, 13px);
    line-height: 1.65;
    letter-spacing: 0.1em;
  }
  .launch-loader__motto { font-size: 7px; letter-spacing: 0.36em; }
}

/* ============================ 参考图标题 ============================ */
#start-overlay .start-title.home-title-graphic {
  display: block;
  width: min(100%, 620px);
  height: clamp(96px, 8.7vw, 158px);
  overflow: hidden;
  background: none;
  -webkit-background-clip: border-box;
  background-clip: border-box;
  -webkit-text-stroke: 0;
  color: inherit;
  font-size: 0;
  letter-spacing: 0;
  line-height: 1;
  text-shadow: none;
  filter: drop-shadow(0 0 8px rgba(176, 225, 255, 0.42))
    drop-shadow(0 0 24px rgba(63, 156, 220, 0.2));
  isolation: isolate;
}

#start-overlay .start-title.home-title-graphic::before,
#start-overlay .start-title.home-title-graphic::after {
  content: none;
}

#start-overlay .start-title.home-title-graphic img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: 50% 50%;
  mix-blend-mode: normal;
  filter: brightness(1.06) contrast(1.08) saturate(0.92);
  pointer-events: none;
  user-select: none;
}

@media (max-width: 760px), (max-aspect-ratio: 4 / 5) {
  #start-overlay .start-title.home-title-graphic {
    width: 100%;
    height: clamp(82px, 24vw, 126px);
  }
}