:root {
  --signal-charcoal: #2a2c2e;
  --signal-white: #e8e6e2;
  --signal-gray: #878c8f;
  --signal-silver: #b8bcc0;
  --signal-brown: #4a3f37;
  --signal-wine: #6e2433;
}

#the-signal[hidden] { display: none; }
#the-signal [hidden] { display: none !important; }

#the-signal {
  position: fixed;
  inset: 0;
  z-index: 80;
  box-sizing: border-box;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: auto;
  padding:
    calc(24px + env(safe-area-inset-top))
    max(20px, env(safe-area-inset-right))
    calc(28px + env(safe-area-inset-bottom))
    max(20px, env(safe-area-inset-left));
  background:
    radial-gradient(circle at 50% 14%, rgba(255, 255, 255, 0.035), transparent 35%),
    var(--signal-charcoal);
  color: var(--signal-white);
  font-family: "Noto Sans TC", ui-sans-serif, system-ui, sans-serif;
}

#the-signal::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.16'/%3E%3C/svg%3E");
}

.signal-shell {
  position: relative;
  width: min(100%, 560px);
  min-height: calc(100vh - 52px);
  min-height: calc(100dvh - 52px);
  margin: auto;
  display: flex;
  flex-direction: column;
}

.signal-head {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 14px;
}

.signal-kicker,
.signal-meta,
.signal-label {
  color: var(--signal-gray);
  font: 11px/1.5 ui-monospace, "SFMono-Regular", monospace;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.signal-close {
  min-width: 40px;
  min-height: 40px;
  border: 0;
  background: none;
  color: var(--signal-white);
  font: 24px/1 ui-sans-serif, system-ui, sans-serif;
  cursor: pointer;
}

.signal-main {
  margin: clamp(50px, 11vh, 120px) 0 auto;
}

.signal-title {
  margin: 8px 0 14px;
  color: var(--signal-white);
  font-size: clamp(38px, 12vw, 70px);
  font-weight: 400;
  letter-spacing: -0.06em;
  line-height: 0.95;
}

.signal-phase {
  color: var(--signal-silver);
  font: 13px/1.6 ui-monospace, "SFMono-Regular", monospace;
  letter-spacing: 0.06em;
}

.signal-status {
  min-height: 24px;
  margin: clamp(34px, 8vh, 70px) 0 14px;
  color: var(--signal-silver);
  font-size: 14px;
  line-height: 1.6;
}

.signal-hold {
  position: relative;
  width: 100%;
  min-height: 76px;
  overflow: hidden;
  border: 1px solid #697174;
  border-radius: 2px;
  background: #232729;
  color: var(--signal-white);
  cursor: pointer;
  touch-action: none;
}

.signal-hold::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--signal-progress, 0%);
  background: var(--signal-silver);
  opacity: 0.22;
  pointer-events: none;
}

.signal-hold span {
  position: relative;
  z-index: 1;
  font: 12px ui-monospace, "SFMono-Regular", monospace;
  letter-spacing: 0.14em;
}

.signal-hold:focus-visible,
.signal-bind:focus-visible,
.signal-retry:focus-visible,
.signal-collection-link:focus-visible,
.signal-close:focus-visible {
  outline: 2px solid var(--signal-white);
  outline-offset: 3px;
}

.signal-hold:disabled {
  cursor: default;
  opacity: 0.45;
}

.signal-result {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid #596164;
}

.signal-result[hidden] { display: none; }

.signal-number {
  color: var(--signal-silver);
  font: clamp(52px, 17vw, 94px)/0.85 ui-monospace, "SFMono-Regular", monospace;
  letter-spacing: 0.08em;
}

.signal-result h2 {
  margin: 22px 0 38px;
  color: var(--signal-gray);
  font: 12px/1.6 ui-monospace, "SFMono-Regular", monospace;
  letter-spacing: 0.1em;
}

.signal-body {
  margin: 0 0 22px;
  color: var(--signal-white);
  white-space: pre-line;
  font-size: clamp(21px, 6.5vw, 31px);
  font-weight: 300;
  line-height: 1.75;
  letter-spacing: 0.025em;
}

.signal-night {
  display: none;
  margin: -6px 0 28px;
  color: #b7818c;
  font-size: 15px;
  line-height: 1.7;
}

.signal-result[data-night]:not([data-night=""]) .signal-night { display: block; }
.signal-result[data-night]:not([data-night=""]) { border-color: var(--signal-wine); }

.signal-detail {
  margin: 14px 0;
  color: var(--signal-silver);
  font-size: 14px;
  line-height: 1.75;
}

.signal-bind,
.signal-retry,
.signal-abandon,
.signal-collection-link,
.signal-continue {
  box-sizing: border-box;
  width: 100%;
  margin-top: 18px;
  padding: 13px 18px;
  border: 1px solid var(--signal-silver);
  border-radius: 2px;
  background: transparent;
  color: var(--signal-white);
  font: 13px/1.4 ui-monospace, "SFMono-Regular", monospace;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.signal-continue {
  margin-top: 10px;
  border-color: #697174;
  color: var(--signal-silver);
}

.signal-continue:hover {
  border-color: var(--signal-white);
  color: var(--signal-white);
}

.signal-bind,
.signal-retry,
.signal-abandon,
.signal-collection-link,
.signal-continue { display: none; }
.signal-result[data-state="anonymous"] .signal-bind,
.signal-result[data-state="unavailable"] .signal-bind,
.signal-result[data-state="unavailable"] .signal-collection-link,
.signal-result[data-state="unavailable"] .signal-retry,
.signal-result[data-state="incomplete"] .signal-collection-link,
.signal-result[data-state="incomplete"] .signal-retry,
.signal-result[data-state="saved"] .signal-collection-link,
.signal-result[data-state="saved"] .signal-continue,
.signal-result[data-state="existing"] .signal-collection-link,
.signal-result[data-state="existing"] .signal-continue { display: block; }
.signal-result[data-state="incomplete"] .signal-bind { display: block; }
.signal-abandon:not([hidden]) { display: block; }

.signal-confirmation {
  margin-top: 18px;
  padding: 18px;
  border: 1px solid #806469;
  color: var(--signal-white);
  line-height: 1.65;
}

.signal-confirmation h2 { margin: 0 0 10px; font-size: 17px; }
.signal-confirmation p { margin: 0 0 12px; color: var(--signal-silver); font-size: 14px; }
.signal-confirmation button {
  min-height: 44px;
  margin: 6px 8px 0 0;
  padding: 9px 14px;
  border: 1px solid var(--signal-silver);
  background: transparent;
  color: var(--signal-white);
  font: 13px/1.4 ui-monospace, "SFMono-Regular", monospace;
  cursor: pointer;
}
.signal-confirmation button:focus-visible,
.signal-abandon:focus-visible { outline: 2px solid var(--signal-white); outline-offset: 3px; }

.signal-result[data-state="unavailable"] { border-color: #806469; }
.signal-result[data-state="saved"] { border-color: #cbd4d1; }

.signal-collection {
  display: grid;
  gap: 18px;
  margin-top: 32px;
}

.signal-collection-card {
  padding: 24px 0;
  border-top: 1px solid #596164;
}

.signal-collection-card .signal-body { margin-top: 18px; }
.signal-collection-card .signal-detail { white-space: pre-line; }

@media (max-width: 360px) {
  #the-signal { padding-inline: 16px; }
  .signal-head { gap: 8px; }
  .signal-kicker { font-size: 10px; letter-spacing: 0.1em; }
  .signal-main { margin-top: 42px; }
}

@media (prefers-reduced-motion: reduce) {
  #the-signal *,
  #the-signal *::before,
  #the-signal *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}