* { box-sizing: border-box; }
:root {
  --paper: #efefea;
  --ink: #111111;
  --muted: rgba(255,255,255,0.78);
}
html, body {
  margin: 0;
  width: 100%;
  height: 100%;
  background: #0c0c0c;
}
body {
  overflow: hidden;
  font-family: "Trebuchet MS", "Arial Rounded MT Bold", Arial, sans-serif;
  color: var(--paper);
}
.site {
  position: relative;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  isolation: isolate;
  background: #0c0c0c;
}
.background,
.vignette,
.grain,
.film-flicker,
.film-scratches,
.film-dust {
  position: absolute;
  inset: 0;
}
.background {
  z-index: -4;
  background: url('assets/scene-bg.png') center center / cover no-repeat;
  transform: scale(1.02);
}
.vignette {
  z-index: -3;
  background:
    radial-gradient(circle at center, rgba(255,255,255,0.03) 0%, rgba(0,0,0,0.08) 56%, rgba(0,0,0,0.44) 100%),
    linear-gradient(180deg, rgba(0,0,0,0.08), rgba(0,0,0,0.25));
}
.grain {
  z-index: 9;
  opacity: 0.34;
  background-image:
    radial-gradient(circle at 30% 10%, rgba(255,255,255,.95) 0 0.7px, transparent 1px),
    radial-gradient(circle at 70% 40%, rgba(255,255,255,.8) 0 0.6px, transparent 0.95px),
    radial-gradient(circle at 25% 75%, rgba(255,255,255,.75) 0 0.6px, transparent 0.95px),
    radial-gradient(circle at 85% 85%, rgba(255,255,255,.85) 0 0.7px, transparent 1px);
  background-size: 220px 220px, 170px 170px, 130px 130px, 190px 190px;
  mix-blend-mode: screen;
  pointer-events: none;
  animation: grainShift .16s steps(2) infinite, grainPulse 1.1s steps(3) infinite;
}

.film-flicker {
  z-index: 10;
  pointer-events: none;
  opacity: 0.28;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.08), rgba(0,0,0,0.02) 20%, rgba(255,255,255,0.04) 45%, rgba(0,0,0,0.05) 80%, rgba(255,255,255,0.08));
  mix-blend-mode: screen;
  animation: filmFlicker .18s steps(2) infinite;
}

.film-scratches {
  z-index: 11;
  pointer-events: none;
  opacity: 0.45;
  background:
    linear-gradient(90deg, transparent 0 6%, rgba(255,255,255,0.16) 6.1%, transparent 6.25%, transparent 18%, rgba(255,255,255,0.12) 18.1%, transparent 18.22%, transparent 54%, rgba(255,255,255,0.11) 54.08%, transparent 54.2%, transparent 76%, rgba(255,255,255,0.14) 76.06%, transparent 76.2%, transparent 100%),
    repeating-linear-gradient(180deg, transparent 0 42px, rgba(255,255,255,0.035) 42px 44px, transparent 44px 88px);
  mix-blend-mode: screen;
  animation: scratchesDrift 7.8s linear infinite, scratchesFlash 1.8s steps(2) infinite;
}

.film-dust {
  z-index: 12;
  pointer-events: none;
  opacity: 0.72;
  background-image:
    radial-gradient(circle at 8% 14%, rgba(255,255,255,0.95) 0 1.4px, transparent 1.8px),
    radial-gradient(circle at 24% 72%, rgba(255,255,255,0.85) 0 1.1px, transparent 1.5px),
    radial-gradient(circle at 42% 18%, rgba(255,255,255,0.92) 0 1.6px, transparent 2px),
    radial-gradient(circle at 65% 58%, rgba(255,255,255,0.8) 0 1.3px, transparent 1.7px),
    radial-gradient(circle at 78% 24%, rgba(255,255,255,0.9) 0 1.2px, transparent 1.8px),
    radial-gradient(circle at 88% 82%, rgba(255,255,255,0.88) 0 1.5px, transparent 2px),
    radial-gradient(circle at 14% 88%, rgba(255,255,255,0.82) 0 1.1px, transparent 1.5px),
    radial-gradient(circle at 58% 84%, rgba(255,255,255,0.92) 0 1.8px, transparent 2.4px);
  background-size: cover;
  mix-blend-mode: screen;
  animation: dustFloat 10s linear infinite, dustBlink 1.6s steps(2) infinite;
}

.title-panel,
.control-panel {
  position: absolute;
  z-index: 3;
}
.title-panel {
  left: clamp(300px, 3vw, 56px);
  top: clamp(0px, -1vh, 48px);
  width: min(40vw, 520px);
  aspect-ratio: 1448 / 1086;
  animation: floatPanel 7s ease-in-out infinite;
}
.control-panel {
  right: clamp(22px, 3.4vw, 60px);
  bottom: clamp(18px, 4vh, 42px);
  width: min(39vw, 500px);
  aspect-ratio: 1448 / 1086;
  animation: floatPanel 7.8s ease-in-out infinite reverse;
}
.panel-art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  pointer-events: none;
  filter: drop-shadow(0 18px 24px rgba(0,0,0,0.42));
}
.logo-art {
  position: absolute;
  left: 8%;
  right: 8%;
  top: 27%;
  width: 84%;
  object-fit: contain;
  user-select: none;
  pointer-events: none;
}
.tagline {
  position: absolute;
  left: 10%;
  right: 10%;
  bottom: 19%;
  margin: 0;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: clamp(10px, 0.9vw, 14px);
  color: rgba(20,20,20,0.88);
  font-weight: 900;
  text-shadow: 0 1px 0 rgba(255,255,255,0.18);
}
.ca-button,
.action-button {
  border: 0;
  background: transparent;
  padding: 0;
  margin: 0;
  text-decoration: none;
  display: block;
  cursor: pointer;
  font: inherit;
}
.ca-button {
  position: absolute;
  left: 9%;
  top: 27%;
  width: 82%;
  aspect-ratio: 2172 / 724;
  transition: transform .18s ease, filter .18s ease;
}
.ca-button > img,
.action-button > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  pointer-events: none;
}
.ca-button:hover,
.action-button:hover {
  transform: translateY(-3px) scale(1.02);
  filter: brightness(1.04);
}
.ca-button:active,
.action-button:active {
  transform: translateY(0) scale(0.99);
}
.ca-value {
  position: absolute;
  left: 18%;
  right: 15%;
  top: 50%;
  transform: translateY(-50%);
  text-align: left;
  color: rgba(18,18,18,0.88);
  font-size: clamp(10px, 0.95vw, 16px);
  font-weight: 900;
  letter-spacing: 0.02em;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}
.action-buttons {
  position: absolute;
  left: 9%;
  right: 9%;
  bottom: 18%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4%;
}
.action-button {
  aspect-ratio: 3 / 1;
}
.action-button.disabled {
  pointer-events: none;
  opacity: 0.55;
  filter: grayscale(1);
}
.copy-toast {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translate(-50%, 18px);
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  z-index: 5;
}
.copy-toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

@keyframes floatPanel {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
@keyframes grainShift {
  0% { transform: translate(0, 0) scale(1); background-position: 0 0, 0 0, 0 0, 0 0; }
  20% { transform: translate(-0.5%, 0.3%) scale(1.02); background-position: 14px -9px, -12px 7px, 9px -4px, -7px 10px; }
  40% { transform: translate(0.45%, -0.35%) scale(1.01); background-position: -10px 12px, 8px -8px, -6px 11px, 12px -6px; }
  60% { transform: translate(-0.2%, 0.4%) scale(1.03); background-position: 7px 5px, -14px -12px, 13px 8px, -9px -3px; }
  80% { transform: translate(0.55%, -0.25%) scale(1.01); background-position: -8px -7px, 10px 13px, -11px -5px, 4px 12px; }
  100% { transform: translate(0, 0) scale(1); background-position: 0 0, 0 0, 0 0, 0 0; }
}
@keyframes grainPulse {
  0%, 100% { opacity: 0.28; }
  35% { opacity: 0.38; }
  70% { opacity: 0.32; }
}
@keyframes filmFlicker {
  0% { opacity: 0.18; }
  10% { opacity: 0.34; }
  20% { opacity: 0.16; }
  30% { opacity: 0.3; }
  40% { opacity: 0.12; }
  50% { opacity: 0.26; }
  60% { opacity: 0.15; }
  70% { opacity: 0.31; }
  80% { opacity: 0.18; }
  90% { opacity: 0.27; }
  100% { opacity: 0.19; }
}
@keyframes scratchesDrift {
  0% { transform: translateX(0); }
  50% { transform: translateX(1.2%); }
  100% { transform: translateX(0); }
}
@keyframes scratchesFlash {
  0%, 100% { opacity: 0.28; }
  45% { opacity: 0.48; }
  50% { opacity: 0.18; }
  55% { opacity: 0.52; }
}
@keyframes dustFloat {
  0% { transform: translateY(0); }
  50% { transform: translateY(-1.2%); }
  100% { transform: translateY(0); }
}
@keyframes dustBlink {
  0%, 100% { opacity: 0.56; }
  25% { opacity: 0.82; }
  50% { opacity: 0.48; }
  75% { opacity: 0.74; }
}

@media (max-width: 980px) {
  .title-panel {
    width: min(45vw, 460px);
  }
  .control-panel {
    width: min(44vw, 460px);
  }
}

@media (max-width: 760px) {
  body { overflow: auto; }
  .site {
    min-height: 100dvh;
    height: auto;
    padding: 16px 12px 22px;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .background, .vignette, .grain, .film-flicker, .film-scratches, .film-dust {
    position: fixed;
  }
  .title-panel,
  .control-panel {
    position: relative;
    left: auto;
    top: auto;
    right: auto;
    bottom: auto;
    width: min(100%, 520px);
    margin: 0 auto;
  }
  .title-panel {
    margin-top: 6px;
  }
  .control-panel {
    margin-top: auto;
  }
  .tagline {
    font-size: 10px;
    letter-spacing: 0.18em;
  }
  .ca-value {
    font-size: 11px;
  }
}