* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: #fff;
  color: #111;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Noto Sans KR", sans-serif;
}

button {
  font: inherit;
}

.screen {
  display: none;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
  padding: 18px;
  background: #fff;
}

.screen.active {
  display: flex;
}

#closedEnvelope {
  width: min(340px, 78vw);
  cursor: pointer;
  filter: drop-shadow(0 18px 20px rgba(0, 0, 0, .14));
  animation: envelopeFloat 2.8s ease-in-out infinite;
  transition: transform .2s, filter .2s;
}

#closedEnvelope:hover {
  transform: translateY(-5px) scale(1.02);
  filter: drop-shadow(0 24px 26px rgba(0, 0, 0, .2));
}

@keyframes envelopeFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.letter-stage {
  position: relative;
  width: min(760px, 96vw);
  min-height: 720px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.open-envelope {
  position: absolute;
  bottom: 26px;
  width: min(470px, 88vw);
  opacity: .9;
  filter: drop-shadow(0 18px 18px rgba(0, 0, 0, .14));
}

.threat-paper {
  position: relative;
  z-index: 2;
  width: min(610px, 94vw);
  aspect-ratio: 1100 / 1371;
  background: url("images/paper-threat.png") center / contain no-repeat;
  padding: clamp(52px, 8vw, 92px) clamp(32px, 6vw, 72px);
  filter: drop-shadow(0 22px 30px rgba(0, 0, 0, .16));
  animation: letterIn .55s both;
}

@keyframes letterIn {
  from { opacity: 0; transform: translateY(28px) scale(.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

#ransomText {
  display: flex;
  flex-direction: column;
  gap: clamp(8px, 1.7vw, 14px);
  padding-top: clamp(20px, 4vw, 42px);
}

.ransom-line {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(2px, .8vw, 5px);
  align-items: center;
  min-height: clamp(25px, 5vw, 40px);
}

.cut {
  display: inline-block;
  min-width: clamp(13px, 3.3vw, 22px);
  padding: 2px clamp(3px, .9vw, 6px) 3px;
  line-height: 1.05;
  color: var(--color);
  background: var(--bg);
  font-family: var(--font);
  font-size: clamp(16px, 4.15vw, var(--size));
  font-weight: var(--weight);
  transform: rotate(var(--rot)) translateY(var(--y));
  box-shadow: 0 1px 2px rgba(0, 0, 0, .25);
  letter-spacing: var(--spacing);
  text-align: center;
}

.space {
  width: clamp(9px, 2.1vw, 17px);
  display: inline-block;
}

#startButton {
  position: fixed;
  left: 50%;
  top: 50%;
  z-index: 20;
  display: none;
  transform: translate(-50%, -50%);
  padding: 15px 34px;
  border: 1px solid #111;
  background: #111;
  color: #fff;
  font-size: 20px;
  letter-spacing: .12em;
  box-shadow: 8px 8px 0 rgba(0, 0, 0, .18);
  cursor: pointer;
}

#startButton.show {
  display: block;
  animation: startIn .55s both;
}

@keyframes startIn {
  from { opacity: 0; transform: translate(-50%, -42%); }
  to { opacity: 1; transform: translate(-50%, -50%); }
}

.room-wrap {
  position: relative;
  width: min(760px, 96vw);
  display: flex;
  align-items: center;
  justify-content: center;
}

.map-frame {
  position: relative;
  width: min(401px, 96vw);
  aspect-ratio: 401 / 403;
  image-rendering: pixelated;
  transition: filter .35s;
}

.map-frame.dimmed {
  filter: brightness(.46);
}

.map-frame.shake {
  animation: mapShake .45s;
}

@keyframes mapShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

.map-img {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
}

.map-hit-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.fixed-button {
  position: fixed;
  z-index: 12;
  display: none;
  min-width: 72px;
  padding: 10px 14px;
  border: 0;
  border-radius: 0;
  background: #111;
  color: #fff;
  box-shadow: 0 0 18px rgba(255, 255, 255, .9), 0 0 28px rgba(0, 0, 0, .18);
  font-size: 14px;
  text-align: center;
  cursor: pointer;
}

#inventoryButton {
  left: 18px;
  bottom: 18px;
}

#resetButton {
  left: 104px;
  bottom: 18px;
}

#backButton {
  right: 18px;
  bottom: 18px;
}

#musicButton {
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
}

.fixed-button.active,
.fixed-button.always {
  display: block;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(255, 255, 255, .58);
}

.modal-backdrop.active {
  display: flex;
}

.modal {
  width: min(530px, 92vw);
  max-height: min(78vh, 720px);
  overflow-y: auto;
  background: rgba(30, 30, 30, .88);
  color: #f6f6f6;
  border: 1px solid rgba(255, 255, 255, .34);
  box-shadow: 0 0 18px rgba(255, 255, 255, .92), 0 0 36px rgba(255, 255, 255, .48);
  border-radius: 0;
  padding: 25px;
  backdrop-filter: blur(3px);
}

.modal h2 {
  margin: 0 0 14px;
  font-size: 22px;
  font-weight: 900;
  color: #fff;
}

.modal p {
  margin: 0;
  line-height: 1.78;
  color: #f1f1f1;
  white-space: pre-line;
}

.choice-list {
  margin-top: 20px;
}

.choice {
  display: block;
  margin: 7px 0;
  color: #fff;
  text-decoration: none;
  line-height: 1.6;
  cursor: pointer;
  user-select: none;
}

.choice:hover {
  color: #dcdcdc;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 18px;
}

.modal-actions button {
  border: 1px solid rgba(255, 255, 255, .34);
  background: transparent;
  color: #fff;
  padding: 8px 13px;
  border-radius: 0;
  cursor: pointer;
}

.text-answer {
  width: 100%;
  margin-top: 16px;
  padding: 11px 12px;
  border: 1px solid rgba(255, 255, 255, .34);
  background: #111;
  color: #fff;
  font: inherit;
  outline: none;
}

.modal-message {
  min-height: 22px;
  margin-top: 8px;
  color: #ffb9b9;
  font-size: 14px;
}

.postit {
  width: min(270px, 88%);
  min-height: 130px;
  margin: 16px auto 18px;
  padding: 22px 18px;
  background: #fff6a6;
  color: #111;
  font-weight: 800;
  line-height: 1.65;
  transform: rotate(-2deg);
  box-shadow: 0 8px 18px rgba(0, 0, 0, .24);
  text-align: center;
}

.lock {
  display: flex;
  justify-content: center;
  gap: 7px;
  margin: 16px 0 12px;
}

.dial {
  width: 48px;
  border: 1px solid rgba(255, 255, 255, .35);
  background: #111;
  overflow: hidden;
}

.dial button {
  width: 100%;
  height: 28px;
  border: 0;
  background: #333;
  color: #fff;
  padding: 0;
  border-radius: 0;
}

.num {
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #e9e9e9;
  color: #111;
  border-top: 1px solid #000;
  border-bottom: 1px solid #000;
  font-size: 28px;
  font-weight: 900;
  font-family: "Courier New", monospace;
}

.inv-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: 12px;
}

.inv-item {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 38px;
  color: #fff;
  cursor: pointer;
}

.inv-item:hover {
  color: #dcdcdc;
}

.inv-item img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  image-rendering: pixelated;
}

.letter-page {
  position: relative;
  width: min(620px, 94vw);
  aspect-ratio: 1100 / 1371;
  max-height: 92vh;
  overflow-y: auto;
  padding: clamp(70px, 8vw, 100px) clamp(42px, 7vw, 78px);
  background: url("images/paper.png") center / contain no-repeat;
  border: 0;
  box-shadow: none;
  line-height: 1.8;
  white-space: pre-line;
}

.letter-page::before { display: none; }

.letter-page::after { display: none; }

@media (max-width: 480px) {
  .screen { padding: 16px; }
  .letter-stage { min-height: 620px; }
  .threat-paper {
    width: min(550px, 98vw);
    padding-left: 26px;
    padding-right: 26px;
  }
  #ransomText { padding-top: 48px; gap: 9px; }
  #startButton { font-size: 18px; padding: 13px 28px; }
  .modal { padding: 21px; }
  .lock { gap: 5px; }
  .dial { width: 42px; }
  .num { height: 48px; font-size: 25px; }
  #resetButton { left: 100px; }
}