:root {
  --bg: #090d15;
  --panel: #0f1622;
  --line: rgba(145, 180, 255, .18);
  --line-strong: rgba(145, 180, 255, .32);
  --text: #eef3ff;
  --muted: #9fb0cc;
  --blue: #91b4ff;
  --blue-soft: #c9dcff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(900px 620px at 12% 6%, rgba(52, 89, 158, .38), transparent 62%),
    radial-gradient(760px 520px at 88% 82%, rgba(74, 58, 146, .24), transparent 62%),
    var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(145, 180, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(145, 180, 255, .035) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(circle at 50% 42%, #000 0%, transparent 76%);
  mask-image: radial-gradient(circle at 50% 42%, #000 0%, transparent 76%);
  pointer-events: none;
}

a { color: var(--blue-soft); text-decoration: none; }
a:hover { color: #fff; }

.topbar {
  position: relative;
  z-index: 2;
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  letter-spacing: -.02em;
}
.brand img { display: block; }
.brand b { font-size: 19px; font-weight: 650; }
.brand .pill {
  margin-left: 4px;
  padding: 4px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--blue);
  background: rgba(145, 180, 255, .07);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: .12em;
}

.topbar nav a {
  font-size: 13px;
  color: var(--muted);
}
.topbar nav a span { color: var(--blue); }

.shell {
  position: relative;
  z-index: 1;
  width: min(1180px, 100%);
  margin: auto;
  padding: 20px 28px 36px;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  align-items: center;
  gap: clamp(36px, 5vw, 76px);
}

.stage {
  position: relative;
  width: 100%;
  max-width: 520px;
  justify-self: end;
}

.stage-glow {
  position: absolute;
  inset: 8% 2%;
  background: radial-gradient(circle at 50% 45%, rgba(90, 137, 227, .38), rgba(48, 72, 128, .12) 45%, transparent 70%);
  filter: blur(45px);
  transform: scale(1.04);
  pointer-events: none;
}

.stage-card {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  border-radius: 28px;
  overflow: hidden;
  background-color: #101724;
  background-image: conic-gradient(#151d2b 25%, transparent 0 50%, #151d2b 0 75%, transparent 0);
  background-size: 22px 22px;
  box-shadow:
    0 30px 90px rgba(0, 0, 0, .45),
    inset 0 0 0 1px rgba(255, 255, 255, .02);
}

.stage-card iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

.stage-meta {
  position: absolute;
  left: 16px;
  bottom: 14px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid rgba(145, 180, 255, .22);
  border-radius: 999px;
  background: rgba(9, 14, 24, .72);
  backdrop-filter: blur(8px);
  color: #c4d5f2;
  font-size: 11px;
  letter-spacing: .01em;
  pointer-events: none;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #74e0b0;
  box-shadow: 0 0 10px rgba(116, 224, 176, .8);
}

.loading {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  background: rgba(10, 15, 24, .9);
  color: #c4d6f5;
  font-size: 13px;
  transition: opacity .35s ease, visibility .35s ease;
}
.loading.hidden { opacity: 0; pointer-events: none; visibility: hidden; }

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(145, 180, 255, .3);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.intro { max-width: 540px; }

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: .18em;
}

h1 {
  margin: 0;
  font-size: clamp(44px, 5.6vw, 76px);
  font-weight: 620;
  line-height: 1.06;
  letter-spacing: -.045em;
}
h1 span {
  background: linear-gradient(135deg, #dce9ff 5%, #8eb4ff 55%, #7f9ff0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  max-width: 470px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.9;
}

.actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: 999px;
  background: linear-gradient(135deg, #d5e4ff, #8fb5ff 55%, #7199ef);
  color: #0a1220;
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -.01em;
  cursor: pointer;
  box-shadow: 0 12px 34px rgba(98, 140, 222, .3);
  transition: transform .16s ease, box-shadow .16s ease, filter .16s ease;
}
.primary:hover { transform: translateY(-1px); box-shadow: 0 16px 40px rgba(98, 140, 222, .4); filter: brightness(1.03); }
.primary:active { transform: translateY(0); }
.primary:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }
.primary .icon {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(10, 18, 32, .14);
  font-size: 10px;
}

.hint { color: #7f91ad; font-size: 11px; letter-spacing: .02em; }

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.chips button {
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(145, 180, 255, .05);
  color: #c8d8f2;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, color .15s ease, transform .15s ease;
}
.chips button:hover {
  background: rgba(145, 180, 255, .13);
  border-color: var(--line-strong);
  color: #fff;
}
.chips button:active { transform: scale(.97); }
.chips button.active {
  background: rgba(145, 180, 255, .2);
  border-color: rgba(145, 180, 255, .55);
  color: #fff;
}
.chips button:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

.note {
  max-width: 470px;
  margin: 26px 0 0;
  padding-left: 14px;
  border-left: 1px solid rgba(145, 180, 255, .3);
  color: #8293ae;
  font-size: 11.5px;
  line-height: 1.85;
}

.ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 24px;
  color: var(--blue);
  font-size: 12.5px;
  font-weight: 600;
}
.ghost:hover { text-decoration: underline; text-underline-offset: 4px; }

.foot {
  position: relative;
  z-index: 1;
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 18px 28px 26px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid rgba(145, 180, 255, .1);
  color: #6f809b;
  font-size: 11px;
}

@media (max-width: 920px) {
  .shell {
    grid-template-columns: 1fr;
    justify-items: center;
    padding-top: 10px;
    gap: 34px;
  }
  .stage { justify-self: center; max-width: min(520px, 100%); }
  .intro { max-width: 560px; width: 100%; }
  .foot { flex-direction: column; gap: 6px; }
}

@media (max-width: 560px) {
  .topbar { padding: 18px 18px; }
  .brand .pill { display: none; }
  .shell { padding: 4px 18px 36px; }
  .stage-card { border-radius: 22px; }
  h1 { font-size: clamp(38px, 11vw, 54px); }
  .lede { font-size: 14px; }
  .note { margin-top: 20px; }
  .foot { padding: 16px 18px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}