:root {
  --ink: #0c1110;
  --panel: #141b19;
  --line: #24302c;
  --mist: #9aada5;
  --paper: #e8f0ec;
  --signal: #3dff9a;
  --signal-dim: rgba(61, 255, 154, 0.18);
  --danger: #ff6b5a;
  --radius: 14px;
  --font: "Instrument Sans", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  background:
    radial-gradient(1200px 600px at 15% -10%, #1a3329 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #12201c 0%, transparent 45%),
    var(--ink);
  color: var(--paper);
  font-family: var(--font);
}

body {
  min-height: 100dvh;
}

.stage {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.25rem clamp(1rem, 3vw, 2rem) 2rem;
}

.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  animation: rise 0.7s ease both;
}

.brand {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.06em;
  line-height: 0.9;
}

.top-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.25rem;
}

.tag {
  margin: 0;
  color: var(--mist);
  font-size: 0.92rem;
}

.version {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--signal);
  border: 1px solid rgba(61, 255, 154, 0.35);
  border-radius: 999px;
  padding: 0.15rem 0.45rem;
  background: rgba(61, 255, 154, 0.08);
}

.viewport {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 1rem;
  min-height: min(72vh, 720px);
}

.frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: #060908;
  border: 1px solid var(--line);
  min-height: 420px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
  animation: rise 0.8s 0.05s ease both;
  display: grid;
  place-items: center;
}

#video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  background: #060908;
  transform: scaleX(-1);
}

.frame.rear #video {
  transform: none;
}

.scanline {
  pointer-events: none;
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(61, 255, 154, 0.08) 48%,
    rgba(61, 255, 154, 0.35) 50%,
    rgba(61, 255, 154, 0.08) 52%,
    transparent 100%
  );
  background-size: 100% 220%;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.frame.scanning .scanline {
  opacity: 1;
  animation: sweep 1.6s linear infinite;
}

.hud {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: center;
  justify-items: start;
  gap: 0.75rem;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  background:
    linear-gradient(160deg, rgba(8, 14, 12, 0.72), rgba(8, 14, 12, 0.45));
  backdrop-filter: blur(2px);
}

.hud[hidden] {
  display: none;
}

.hud-title {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  letter-spacing: -0.04em;
}

.hud-copy {
  margin: 0 0 0.5rem;
  max-width: 28rem;
  color: var(--mist);
  line-height: 1.45;
}

.live-badge {
  position: absolute;
  top: 0.65rem;
  left: 0.65rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.28rem 0.55rem;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.55);
  border: 1px solid rgba(61, 255, 154, 0.35);
  color: var(--signal);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  z-index: 2;
}

.live-badge::before {
  content: "";
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 10px var(--signal);
  animation: pulse 1.4s ease infinite;
}

.panel {
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--panel) 92%, black);
  border: 1px solid var(--line);
  animation: rise 0.85s 0.1s ease both;
  min-height: 0;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.panel-head h1 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.status {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--mist);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.status.busy {
  color: var(--signal);
}

.status.err {
  color: var(--danger);
}

#output {
  width: 100%;
  min-height: 0;
  height: 100%;
  resize: none;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #0a100e;
  color: var(--paper);
  padding: 0.9rem 1rem;
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.55;
}

#output:focus {
  outline: 2px solid var(--signal-dim);
  border-color: color-mix(in srgb, var(--signal) 45%, var(--line));
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.72rem 1.1rem;
  font: 600 0.95rem/1 var(--font);
  letter-spacing: -0.01em;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn.primary {
  background: var(--signal);
  color: #062015;
}

.btn.pay {
  background: #1a6bff;
  color: #f4f8ff;
}

.btn.pay.alt {
  background: #0f3d99;
}

.bank-box {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.45rem 0.65rem;
  align-items: center;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0a100e;
}

.bank-meta {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
}

.bank-title {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--paper);
}

.bank-line {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--mist);
  letter-spacing: 0.01em;
}

.bank-line strong {
  color: var(--paper);
  font-weight: 500;
}

.bank-uri {
  display: block;
  margin: 0;
  font-family: var(--mono);
  font-size: 0.58rem;
  color: var(--signal);
  word-break: break-all;
  line-height: 1.35;
  opacity: 0.9;
}

.bank-qr {
  width: 88px;
  height: 88px;
  border-radius: 6px;
  background: #fff;
}

.btn.ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--line);
}

.file-btn {
  display: inline-flex;
  align-items: center;
}

.hint {
  margin: 0;
  color: var(--mist);
  font-size: 0.8rem;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes sweep {
  from {
    background-position: 0 -40%;
  }
  to {
    background-position: 0 140%;
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

/* Mobile: one screen, no page scroll; full uncropped camera, smaller preview */
@media (max-width: 860px) {
  html,
  body {
    height: 100dvh;
    overflow: hidden;
  }

  .stage {
    height: 100dvh;
    height: 100svh;
    padding:
      max(0.45rem, env(safe-area-inset-top))
      max(0.7rem, env(safe-area-inset-right))
      max(0.45rem, env(safe-area-inset-bottom))
      max(0.7rem, env(safe-area-inset-left));
    display: grid;
    grid-template-rows: auto 1fr;
    gap: 0.45rem;
  }

  .top {
    margin-bottom: 0;
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
  }

  .brand {
    font-size: 1.35rem;
  }

  .top-right {
    flex-direction: row;
    align-items: center;
    gap: 0.4rem;
  }

  .tag {
    font-size: 0.7rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 42vw;
  }

  .version {
    font-size: 0.6rem;
    flex-shrink: 0;
  }

  .bank-box {
    padding: 0.35rem 0.45rem;
  }

  .bank-qr {
    width: 72px;
    height: 72px;
  }

  .bank-title,
  .bank-line {
    font-size: 0.62rem;
  }

  .bank-uri {
    font-size: 0.52rem;
    max-height: 2.4em;
    overflow: hidden;
  }

  .viewport {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 38%) minmax(0, 1fr);
    gap: 0.45rem;
    min-height: 0;
    height: 100%;
  }

  .frame {
    min-height: 0;
    height: 100%;
    box-shadow: none;
    border-radius: 12px;
  }

  #video {
    object-fit: contain;
  }

  .hud {
    gap: 0.4rem;
    padding: 0.75rem;
    align-content: end;
  }

  .hud-title {
    font-size: 1.05rem;
  }

  .hud-copy {
    margin: 0;
    font-size: 0.78rem;
    line-height: 1.3;
    max-width: none;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .panel {
    gap: 0.4rem;
    padding: 0.65rem;
    border-radius: 12px;
    min-height: 0;
  }

  .panel-head h1 {
    font-size: 0.85rem;
  }

  .status {
    font-size: 0.65rem;
  }

  #output {
    padding: 0.55rem 0.65rem;
    font-size: 0.75rem;
    line-height: 1.4;
    border-radius: 10px;
  }

  .actions {
    gap: 0.35rem;
  }

  .btn {
    padding: 0.55rem 0.85rem;
    font-size: 0.82rem;
  }

  .hint {
    font-size: 0.65rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}