:root {
  color-scheme: dark;
  --shell-bg: #050816;
  --shell-surface: rgba(11, 18, 39, 0.88);
  --shell-border: rgba(214, 181, 99, 0.28);
  --shell-text: #f5ecd4;
  --shell-muted: rgba(245, 236, 212, 0.74);
  --shell-accent: #f4cf74;
  --shell-accent-strong: #ffdf8c;
  --shell-shadow: 0 28px 100px rgba(0, 0, 0, 0.38);
  --shell-dvh: 100dvh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top, rgba(137, 92, 255, 0.2), transparent 36%),
    radial-gradient(circle at bottom right, rgba(255, 194, 86, 0.12), transparent 28%),
    var(--shell-bg);
  color: var(--shell-text);
}

body {
  min-height: var(--shell-dvh, 100dvh);
}

button,
a {
  font: inherit;
}

.shell-app {
  position: relative;
  min-height: var(--shell-dvh, 100dvh);
  padding:
    max(16px, env(safe-area-inset-top))
    max(16px, env(safe-area-inset-right))
    max(16px, env(safe-area-inset-bottom))
    max(16px, env(safe-area-inset-left));
}

.shell-backdrop {
  position: fixed;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(3, 7, 18, 0.18), rgba(3, 7, 18, 0.78)),
    radial-gradient(circle at center, rgba(250, 214, 114, 0.08), transparent 48%);
  pointer-events: none;
}

.shell-stage {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: min(100%, 1460px);
  min-height: calc(var(--shell-dvh, 100dvh) - 32px);
  margin: 0 auto;
}

.shell-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  border: 1px solid var(--shell-border);
  border-radius: 22px;
  background: var(--shell-surface);
  box-shadow: var(--shell-shadow);
  backdrop-filter: blur(18px);
}

.shell-header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 2.4vw, 2.4rem);
  letter-spacing: 0.08em;
}

.shell-kicker,
.shell-subtitle,
.shell-tip {
  margin: 0;
}

.shell-kicker {
  color: var(--shell-accent);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.shell-subtitle,
.shell-tip {
  color: var(--shell-muted);
}

.shell-subtitle {
  margin-top: 6px;
  font-size: 0.95rem;
}

.shell-direct-link,
.shell-actions a,
.shell-actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid rgba(244, 207, 116, 0.34);
  border-radius: 999px;
  background: rgba(244, 207, 116, 0.14);
  color: var(--shell-text);
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease;
}

.shell-direct-link:hover,
.shell-actions a:hover,
.shell-actions button:hover {
  transform: translateY(-1px);
  background: rgba(244, 207, 116, 0.22);
  border-color: rgba(255, 223, 140, 0.66);
}

.shell-actions button {
  appearance: none;
}

.shell-frame-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--shell-border);
  border-radius: 26px;
  background: rgba(4, 10, 26, 0.92);
  box-shadow: var(--shell-shadow);
}

.shell-frame {
  display: block;
  width: 100%;
  min-height: calc(var(--shell-dvh, 100dvh) - 140px);
  border: 0;
  background: #040812;
}

.shell-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background:
    linear-gradient(180deg, rgba(5, 8, 22, 0.3), rgba(5, 8, 22, 0.84)),
    rgba(5, 8, 22, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 240ms ease;
}

.shell-overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.shell-panel {
  width: min(100%, 430px);
  padding: 24px;
  border: 1px solid rgba(244, 207, 116, 0.22);
  border-radius: 24px;
  background: rgba(9, 14, 32, 0.92);
  text-align: center;
  box-shadow: var(--shell-shadow);
  backdrop-filter: blur(16px);
}

.shell-panel h2 {
  margin: 14px 0 8px;
  font-size: 1.3rem;
}

.shell-panel p {
  margin: 0;
}

.shell-spinner {
  display: inline-block;
  width: 44px;
  height: 44px;
  border: 3px solid rgba(244, 207, 116, 0.18);
  border-top-color: var(--shell-accent-strong);
  border-radius: 50%;
  animation: shell-spin 880ms linear infinite;
}

.shell-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.shell-tip {
  margin-top: 12px;
  font-size: 0.9rem;
}

@keyframes shell-spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 900px) {
  .shell-stage {
    min-height: calc(var(--shell-dvh, 100dvh) - 20px);
  }

  .shell-header {
    flex-direction: column;
    align-items: stretch;
    padding: 14px;
  }

  .shell-direct-link {
    width: 100%;
  }

  .shell-frame {
    min-height: calc(var(--shell-dvh, 100dvh) - 172px);
  }
}

@media (max-width: 640px) {
  .shell-app {
    padding:
      max(10px, env(safe-area-inset-top))
      max(10px, env(safe-area-inset-right))
      max(10px, env(safe-area-inset-bottom))
      max(10px, env(safe-area-inset-left));
  }

  .shell-frame-wrap,
  .shell-header,
  .shell-panel {
    border-radius: 20px;
  }
}