:root {
  --device-w: 1629;
  --device-h: 1260;
  --screen-w: 1200;
  --screen-h: 825;
  --screen-ink: #000;
  --screen-row-header: 160fr;
  --screen-row-progress: 64fr;
  --screen-row-question: 471fr;
  --screen-row-options: 130fr;
  --viewport-pad: clamp(10px, 2vw, 24px);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  background: transparent;
}

.sim-shell {
  width: 100%;
  overflow: visible;
}

.device-stage {
  position: relative;
  width: 100%;
  aspect-ratio: calc(var(--device-w) / var(--device-h));
  overflow: visible;
}

.device-svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.fo-screen {
  position: relative;
  width: calc(var(--screen-w) * 1px);
  height: calc(var(--screen-h) * 1px);
  background: #e1e1e1;
  color: #000;
  overflow: hidden;
  display: grid;
  grid-template-rows:
    minmax(0, var(--screen-row-header))
    minmax(0, var(--screen-row-progress))
    minmax(0, var(--screen-row-question))
    minmax(0, var(--screen-row-options));
  font-family: "Iosevka", "Courier New", monospace;
}

.fo-screen.ios-screen-overlay {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  transform-origin: top left;
  will-change: transform;
}

.fo-screen::after {
  content: "";
  position: absolute;
  inset: 0;
  background: #f3f3f3;
  opacity: 0;
  pointer-events: none;
  z-index: 4;
}

.fo-screen.epaper-clearing .screen-progress-row,
.fo-screen.epaper-clearing .screen-question,
.fo-screen.epaper-clearing .screen-options {
  animation: epaperSectionOut 280ms steps(3, end) forwards;
}

.fo-screen.epaper-revealing .screen-progress-row,
.fo-screen.epaper-revealing .screen-question,
.fo-screen.epaper-revealing .screen-options {
  animation: epaperSectionIn 460ms steps(3, end) both;
}

.fo-screen.epaper-blank > * {
  opacity: 0;
}

.fo-screen.epaper-banner .screen-progress-row,
.fo-screen.epaper-banner .screen-question,
.fo-screen.epaper-banner .screen-options {
  opacity: 0;
}

.fo-screen.epaper-banner .screen-header {
  animation: epaperBlinkIn 520ms steps(2, end) both;
}

.fo-screen.epaper-body .screen-header {
  opacity: 1;
}

.fo-screen.epaper-body .screen-progress-row,
.fo-screen.epaper-body .screen-question,
.fo-screen.epaper-body .screen-options {
  animation: epaperBlinkIn 520ms steps(2, end) both;
}

@keyframes epaperSectionOut {
  0% {
    opacity: 1;
    filter: none;
  }
  35% {
    opacity: 0.16;
    filter: brightness(1.22) contrast(0.9);
  }
  100% {
    opacity: 0.07;
    filter: brightness(1.08) contrast(0.88);
  }
}

@keyframes epaperSectionIn {
  0% {
    opacity: 0.08;
    filter: brightness(1.2) contrast(0.9);
  }
  40% {
    opacity: 0.92;
  }
  58% {
    opacity: 0.28;
  }
  100% {
    opacity: 1;
    filter: none;
  }
}

@keyframes epaperFlash {
  0% {
    opacity: 0;
  }
  30% {
    opacity: 0.5;
  }
  100% {
    opacity: 0;
  }
}

@keyframes epaperBlinkIn {
  0% {
    opacity: 0;
  }
  38% {
    opacity: 1;
  }
  54% {
    opacity: 0.15;
  }
  100% {
    opacity: 1;
  }
}

.screen-header {
  background: #272524;
  color: #eee;
  display: grid;
  grid-template-columns: 1fr 30%;
  gap: 10px;
  padding: 0 14px;
  align-items: center;
  align-content: center;
}

.screen-topic {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-self: center;
}

.screen-topic h1 {
  margin: 0;
  color: #d8c8c8;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 42px;
  line-height: 1;
  max-width: 30ch;
  white-space: pre-line;
}

.screen-topic p {
  margin: 10px 0 0;
  color: #d8c8c8;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 23px;
  line-height: 1.05;
  max-width: 60ch;
  white-space: pre-line;
}

#survey-logo {
  height: 52%;
  width: 100%;
  object-fit: contain;
  object-position: right center;
  justify-self: end;
  align-self: center;
  display: none;
}

.screen-progress-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  padding: 20px 14px;
  align-items: center;
}

.question-number {
  width: 55px;
  min-width: 55px;
  height: 55px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--screen-ink);
  background: var(--screen-ink);
  color: #e1e1e1;
  text-align: center;
  font-size: 22px;
  line-height: 1;
}

.progress-track {
  height: 55px;
  border: 2px solid var(--screen-ink);
  background: #e1e1e1;
  padding: 2px;
  box-sizing: border-box;
}

.progress-fill {
  height: 100%;
  width: 0;
  background: var(--screen-ink);
  transition: width 0.18s ease;
}

.screen-question {
  padding: 40px 14px;
  font-family: "Iosevka", "Courier New", monospace;
  font-size: calc((var(--screen-w) / 1200) * 63px);
  line-height: 1;
  color: var(--screen-ink);
  white-space: pre-wrap;
  max-width: 37ch;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 5;
}

.screen-options {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  overflow: hidden;
}

.option-cell {
  min-width: 0;
  border-top: 2px solid var(--screen-ink);
  border-right: 2px solid var(--screen-ink);
  padding: 3px 8px 8px;
  font-family: "Iosevka", "Courier New", monospace;
  font-size: calc((var(--screen-w) / 1200) * 32px);
  line-height: 1;
  color: var(--screen-ink);
  text-align: left;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
}

.option-cell:last-child {
  border-right: 0;
}

.option-cell.empty {
  border-top: 0;
  border-right: 0;
  padding: 0;
}

.option-cell.disabled {
  opacity: 0.35;
}

.control-button {
  position: absolute;
  left: calc((var(--x) / var(--device-w)) * 100%);
  top: calc((var(--y) / var(--device-h)) * 100%);
  width: calc((var(--d) / var(--device-w)) * 100%);
  aspect-ratio: 1 / 1;
  transform: translate(-50%, -50%);
  border: 0;
  padding: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.control-button:disabled {
  cursor: default;
}

.control-button:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.controls-bottom {
  position: static;
}

.cta-hint {
  position: absolute;
  left: calc((var(--x) / var(--device-w)) * 100%);
  top: calc((var(--y) / var(--device-h)) * 100%);
  transform: translate(-50%, -50%) rotate(-4deg);
  background: #fff5bd;
  color: #111;
  border: 2px solid #111;
  border-radius: 10px;
  padding: 8px 14px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(12px, 1.8vw, 28px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  pointer-events: none;
  box-shadow: 0 4px 0 rgba(17, 17, 17, 0.45);
  z-index: 5;
}

.cta-hint[hidden] {
  display: none !important;
}