:root {
  color-scheme: light;
  --text: rgba(42, 42, 42, 0.78);
  --muted: rgba(42, 42, 42, 0.5);
  --strong: rgba(20, 20, 20, 0.82);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  color: var(--text);
}

body {
  overflow: hidden;
  cursor: pointer;
  user-select: none;
}

body.is-expired {
  cursor: default;
}

body.is-expiring {
  cursor: default;
}

.background-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: #fff;
  background-size: cover;
  background-position: center;
  transition: background-image 0.6s ease;
}

.effect-layer {
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  overflow: hidden;
}

.toast {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 4;
  max-width: min(24rem, calc(100vw - 3rem));
  padding: 0.75rem 0.95rem;
  border-radius: 999px;
  color: var(--strong);
  font-size: 0.82rem;
  line-height: 1.45;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-0.4rem);
  transition: opacity 0.2s ease, transform 0.2s ease;
  backdrop-filter: blur(10px);
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.app {
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

.click-stage {
  position: fixed;
  inset: 0;
  z-index: 1;
}

.farewell-screen {
  position: fixed;
  inset: 0;
  z-index: 2;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  color: var(--strong);
  font-size: clamp(1.2rem, 3vw, 2rem);
  line-height: 2;
  letter-spacing: -0.03em;
  text-align: center;
  text-shadow: 0 1px 10px rgba(255, 255, 255, 0.9);
}

.farewell-screen p {
  margin: 0;
  opacity: 0;
  transform: translate(var(--start-x, 0), var(--start-y, 1.2rem)) scale(1.08);
}

body.is-expiring .farewell-screen {
  display: flex;
  flex-direction: column;
}

body.is-expiring .farewell-screen p {
  animation: gather-in 2.8s cubic-bezier(0.16, 1, 0.3, 1) var(--gather-delay, 0s) forwards;
}

body.is-expired .farewell-screen {
  display: flex;
  flex-direction: column;
}

body.is-expired .farewell-screen p {
  opacity: 1;
  transform: translate(0, 0) scale(1);
}

body.is-expiring .keeper-panel,
body.is-expiring .traces-panel {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.45s ease;
}

.text-particle {
  position: fixed;
  z-index: 4;
  pointer-events: none;
  line-height: 1;
  animation: particle-disperse 1.65s cubic-bezier(0.2, 0.8, 0.2, 1) var(--particle-delay, 0s) forwards;
  transform-origin: center;
  will-change: opacity, transform, filter;
}

body.is-expired .keeper-panel,
body.is-expired .traces-panel {
  display: none;
}

.keeper-panel,
.traces-panel {
  position: fixed;
  z-index: 2;
  max-width: min(24rem, calc(100vw - 3rem));
  font-size: 0.78rem;
  line-height: 1.9;
  letter-spacing: -0.02em;
  text-shadow: 0 1px 8px rgba(255, 255, 255, 0.85);
}

.keeper-panel {
  right: 2rem;
  bottom: 2rem;
  text-align: right;
}

.keeper-text {
  margin-bottom: 1.3rem;
  color: var(--strong);
}

.keeper-text p {
  margin: 0;
  white-space: pre-wrap;
}

.text-stats {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.text-stats div {
  display: flex;
  justify-content: flex-end;
  gap: 0.45rem;
}

.text-stats span,
.traces-panel h2 {
  color: var(--muted);
  font-weight: 400;
}

.text-stats strong {
  color: var(--strong);
  font-weight: 600;
}

.traces-panel {
  left: 2rem;
  bottom: 2rem;
}

.traces-panel h2 {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
}

.recent-traces {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
}

.recent-traces li {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text);
}

.recent-traces .emoji {
  width: 1.3rem;
  font-size: 0.95rem;
}

.recent-traces .time {
  color: var(--muted);
}

.recent-traces .empty {
  color: var(--muted);
}

.click-message {
  position: absolute;
  max-width: min(28rem, calc(100vw - 3rem));
  color: var(--strong);
  font-size: clamp(0.92rem, 2vw, 1.1rem);
  line-height: 1.5;
  white-space: nowrap;
  text-shadow: 0 1px 12px rgba(255, 255, 255, 0.95);
  animation: message-fade 1.8s ease forwards;
}

@keyframes message-fade {
  0% {
    opacity: 0;
    transform: translate(-50%, 0.75rem);
  }

  16% {
    opacity: 1;
    transform: translate(-50%, 0);
  }

  72% {
    opacity: 1;
    transform: translate(-50%, -0.25rem);
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -1.25rem);
  }
}

@keyframes particle-disperse {
  0% {
    opacity: 1;
    filter: blur(0);
    transform: translate(0, 0) rotate(0deg) scale(1);
  }

  55% {
    opacity: 0.58;
    filter: blur(1.2px);
  }

  100% {
    opacity: 0;
    filter: blur(5px);
    transform:
      translate(var(--particle-x, 3rem), var(--particle-y, -4rem))
      rotate(var(--particle-rotation, 6deg))
      scale(0.86);
  }
}

@keyframes gather-in {
  0% {
    opacity: 0;
    filter: blur(8px);
    letter-spacing: 0.08em;
    transform: translate(var(--start-x, 0), var(--start-y, 1.2rem)) scale(1.08);
  }

  55% {
    opacity: 0.64;
    filter: blur(2px);
  }

  100% {
    opacity: 1;
    filter: blur(0);
    letter-spacing: -0.03em;
    transform: translate(0, 0) scale(1);
  }
}

@media (max-width: 640px) {
  .toast {
    top: 1rem;
    right: 1rem;
  }

  .keeper-panel {
    right: 1.25rem;
    bottom: 1.25rem;
    max-width: calc(100vw - 2.5rem);
  }

  .traces-panel {
    display: none;
  }
}