.stage {
  position: fixed;
  inset: 0;
  background: #06060a;
  height: 100%;
  height: 100dvh;
}

/* ---------- power-on self test ---------- */

.post {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  background: #000000;
  color: #ffffff;
  font-family: "Lucida Console", ui-monospace, "Courier New", monospace;
  font-size: clamp(17px, 2.35vw, 30px);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.03em;
  white-space: pre-wrap;
  text-shadow: 0 0 14px rgba(255, 255, 255, 0.28);
  transition:
    opacity 0.35s ease,
    visibility 0.35s ease;
}

.post-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: 100%;
  padding: clamp(28px, 5vh, 64px) clamp(28px, 6vw, 88px);
}

.post.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* Scanlines and a soft tube vignette, so the first thing you see is a CRT. */
.post::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.14) 0px,
    rgba(0, 0, 0, 0.14) 1px,
    transparent 1px,
    transparent 3px
  );
  pointer-events: none;
}

.post::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse at 50% 50%,
    transparent 48%,
    rgba(0, 0, 0, 0.32) 100%
  );
  pointer-events: none;
}

.post-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: clamp(20px, 4vw, 48px);
  width: 100%;
  margin-bottom: clamp(20px, 3.5vh, 40px);
}

.post-bios {
  flex: 1;
  font-size: clamp(19px, 2.8vw, 34px);
  line-height: 1.45;
}

.post-memory {
  margin-bottom: clamp(16px, 2.5vh, 28px);
  font-size: clamp(18px, 2.5vw, 32px);
}

.post-foot {
  margin-top: auto;
  padding-top: clamp(20px, 3vh, 36px);
  font-size: clamp(17px, 2.2vw, 28px);
}

.post-badge {
  flex: none;
  align-self: flex-start;
  padding: 6px 12px 8px;
  border: 2px solid #ffffff;
  color: #7dff7d;
  font-size: clamp(12px, 1.4vw, 16px);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-align: center;
  text-shadow: none;
}

.post-badge span {
  display: block;
  color: #ffffff;
  letter-spacing: 0.1em;
}

.post b {
  color: #ffffff;
  font-weight: 800;
}

.post .ok {
  color: #7dff7d;
  font-weight: 800;
  text-shadow: 0 0 10px rgba(125, 255, 125, 0.45);
}

.post-devices {
  flex: 1;
  min-height: 38vh;
  font-size: clamp(16px, 2.15vw, 28px);
  line-height: 1.65;
}

.post-prompt {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 0.9em;
}

.post-enter {
  padding: 4px 14px 5px;
  border: 0;
  background: #c0c0c0;
  box-shadow:
    inset -1px -1px 0 #000000,
    inset 1px 1px 0 #ffffff,
    inset -2px -2px 0 #808080,
    inset 2px 2px 0 #dfdfdf;
  color: #000000;
  font-family: Tahoma, "MS Sans Serif", Geneva, Verdana, sans-serif;
  font-size: 0.85em;
  cursor: pointer;
}

.post-enter:active {
  box-shadow:
    inset -1px -1px 0 #ffffff,
    inset 1px 1px 0 #808080,
    inset -2px -2px 0 #dfdfdf,
    inset 2px 2px 0 #000000;
}

.post-enter[disabled] {
  color: #808080;
  text-shadow: 1px 1px 0 #ffffff;
  cursor: progress;
}

.post-cursor {
  display: inline-block;
  width: 0.62em;
  height: 1.1em;
  translate: 0 0.16em;
  background: #ffffff;
  animation: post-blink 1s steps(2, end) infinite;
}

@keyframes post-blink {
  50% {
    opacity: 0;
  }
}

/* ---------- title screen ---------- */

.start-screen {
  position: fixed;
  inset: 0;
  z-index: 110;
  display: grid;
  place-items: center;
  background: #000000;
  transition:
    opacity 0.45s ease,
    visibility 0.45s ease;
}

.start-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.start-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(24px, 4vh, 40px);
  width: min(94vw, 760px);
  padding: clamp(40px, 6vh, 72px) clamp(36px, 5vw, 56px);
  border: 3px solid #ffffff;
  color: #ffffff;
  font-family: "Lucida Console", ui-monospace, "Courier New", monospace;
  text-align: center;
  text-shadow: 0 0 16px rgba(255, 255, 255, 0.32);
}

.start-title,
.start-subtitle {
  margin: 0;
  font-size: clamp(20px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: 0.04em;
}

.start-subtitle {
  font-size: clamp(18px, 2.8vw, 28px);
  font-weight: 700;
}

.start-button {
  min-width: clamp(140px, 22vw, 200px);
  padding: 14px 32px;
  border: 3px solid #ffffff;
  background: transparent;
  color: #ffffff;
  font: inherit;
  font-size: clamp(18px, 3vw, 30px);
  font-weight: 800;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: background 0.15s ease;
}

.start-button:hover {
  background: rgba(255, 255, 255, 0.08);
}

.start-button:active {
  background: rgba(255, 255, 255, 0.16);
}

/* ---------- hud ---------- */

.hud {
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  font-family: Tahoma, "MS Sans Serif", Geneva, Verdana, sans-serif;
  color: #d6d6d6;
  opacity: 1;
  transition: opacity 0.4s ease;
}

.hud.dim {
  opacity: 0;
}

.hud .brand {
  position: absolute;
  top: max(20px, env(safe-area-inset-top, 0px));
  left: max(22px, env(safe-area-inset-left, 0px));
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.6);
}

.hud .brand small {
  display: block;
  margin-top: 2px;
  color: #b8b8c0;
  font-size: 14px;
  font-weight: 400;
}

/* Balloon help, the way it looked before tooltips got rounded corners. */
.hud .hint {
  position: absolute;
  left: 50%;
  bottom: max(28px, calc(16px + env(safe-area-inset-bottom, 0px)));
  translate: -50% 0;
  padding: 3px 8px 4px;
  border: 1px solid #000000;
  background: #ffffe1;
  color: #000000;
  font-size: 12px;
  white-space: nowrap;
}

.hud .hint strong {
  font-weight: 700;
}

@media (max-width: 820px) {
  .post {
    overflow: auto;
  }

  .post-inner {
    padding: max(20px, env(safe-area-inset-top, 0px))
      max(20px, env(safe-area-inset-right, 0px))
      max(24px, env(safe-area-inset-bottom, 0px))
      max(20px, env(safe-area-inset-left, 0px));
  }

  .post-head {
    flex-direction: column;
  }

  .start-panel {
    width: min(94vw, 760px);
    padding: 28px 20px;
  }

  .hud .brand {
    font-size: 15px;
    max-width: calc(100% - 24px);
  }

  .hud .brand small {
    font-size: 12px;
  }

  .hud .hint {
    max-width: min(92vw, 360px);
    white-space: normal;
    text-align: center;
    font-size: 12px;
    line-height: 1.35;
  }

  .stage--compact .hud--monitor .brand {
    display: none;
  }
}

/* Full-screen OS on phones — the CRT iframe is too small to use. */
.mobile-os {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: #3e9697;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.25s ease,
    visibility 0.25s ease;
}

.mobile-os--open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-os iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #3e9697;
}