:root {
  --bg: #05070d;
  --panel: rgba(8, 14, 28, 0.78);
  --panel-strong: rgba(11, 18, 35, 0.92);
  --line: rgba(63, 245, 255, 0.2);
  --line-hot: rgba(255, 43, 214, 0.38);
  --text: #f4fbff;
  --muted: #93a4b8;
  --cyan: #31f7ff;
  --magenta: #ff2bd6;
  --lime: #c6ff3d;
  --alert: #ff6b5f;
  --paper: #ffffff;
  --ink: #05070d;
  --radius: 8px;
  --qr-stage-padding: clamp(18px, 4vw, 30px);
  --surface-size: clamp(280px, min(28vw, 42svh), 390px);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: var(--text);
  background: var(--bg);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    linear-gradient(rgba(49, 247, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(49, 247, 255, 0.055) 1px, transparent 1px),
    linear-gradient(135deg, rgba(255, 43, 214, 0.13), transparent 32%),
    linear-gradient(315deg, rgba(198, 255, 61, 0.08), transparent 26%),
    var(--bg);
  background-size: 44px 44px, 44px 44px, auto, auto, auto;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  background:
    linear-gradient(90deg, transparent 0 17%, rgba(49, 247, 255, 0.12) 17% 17.2%, transparent 17.2% 100%),
    linear-gradient(180deg, transparent 0 12%, rgba(255, 43, 214, 0.12) 12% 12.25%, transparent 12.25% 100%);
  opacity: 0.8;
}

body::after {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  pointer-events: none;
  background: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.035) 0,
    rgba(255, 255, 255, 0.035) 1px,
    transparent 1px,
    transparent 7px
  );
  opacity: 0.32;
}

button,
textarea {
  font: inherit;
}

.app-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(18px, 3vw, 32px) 0 24px;
  display: grid;
  grid-template-rows: auto auto auto;
  gap: clamp(16px, 2.5vw, 24px);
}

.topbar {
  position: relative;
  padding: 6px 0 16px;
}

.topbar::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  content: "";
  background: linear-gradient(90deg, var(--cyan), var(--magenta), transparent);
  box-shadow: 0 0 24px rgba(49, 247, 255, 0.55);
}

h1,
h2,
p {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  font-size: clamp(3rem, 8vw, 6.6rem);
  line-height: 0.82;
  font-weight: 900;
  text-transform: uppercase;
  text-shadow:
    0 0 22px rgba(49, 247, 255, 0.38),
    0 0 40px rgba(255, 43, 214, 0.18);
}

.topbar p {
  max-width: 520px;
  margin-top: 10px;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.45;
}

h2 {
  font-size: clamp(1.3rem, 2vw, 1.85rem);
  line-height: 1;
  font-weight: 820;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.92fr);
  gap: clamp(16px, 2.3vw, 24px);
  align-items: start;
}

.input-panel,
.output-panel {
  position: relative;
  min-width: 0;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow:
    0 0 0 1px rgba(255, 43, 214, 0.08) inset,
    0 26px 80px rgba(0, 0, 0, 0.42),
    0 0 42px rgba(49, 247, 255, 0.08);
  backdrop-filter: blur(18px);
}

.input-panel::before,
.output-panel::before {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(49, 247, 255, 0.18), transparent 28%),
    linear-gradient(315deg, rgba(255, 43, 214, 0.13), transparent 34%);
  opacity: 0.75;
}

.input-panel > *,
.output-panel > * {
  position: relative;
  z-index: 1;
}

.input-panel {
  padding: clamp(18px, 2.5vw, 24px);
  display: grid;
  grid-template-rows: auto var(--surface-size) auto;
  gap: 18px;
}

.output-panel {
  padding: clamp(18px, 2.5vw, 24px);
  display: grid;
  grid-template-rows: auto var(--surface-size) auto;
  gap: 18px;
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  gap: 16px;
}

.mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-width: min(100%, 230px);
  padding: 4px;
  background: rgba(1, 5, 12, 0.72);
  border: 1px solid rgba(49, 247, 255, 0.26);
  border-radius: var(--radius);
  box-shadow:
    0 0 0 1px rgba(255, 43, 214, 0.1) inset,
    0 0 24px rgba(49, 247, 255, 0.08);
}

.mode-button {
  min-height: 38px;
  padding: 0 14px;
  color: var(--muted);
  font-weight: 850;
  white-space: nowrap;
  background: transparent;
  border: 0;
  border-radius: calc(var(--radius) - 3px);
  cursor: pointer;
  transition:
    color 150ms ease,
    background 150ms ease,
    box-shadow 150ms ease,
    transform 150ms ease;
}

.mode-button:hover {
  color: var(--text);
}

.mode-button.is-active {
  color: var(--ink);
  background: var(--lime);
  box-shadow:
    0 0 16px rgba(198, 255, 61, 0.28),
    0 0 28px rgba(49, 247, 255, 0.12);
}

.mode-button.is-active:hover {
  transform: translateY(-1px);
}

textarea {
  width: 100%;
  min-height: 100%;
  padding: 20px;
  color: var(--text);
  caret-color: var(--lime);
  background: rgba(2, 6, 14, 0.86);
  border: 1px solid rgba(49, 247, 255, 0.3);
  border-radius: var(--radius);
  resize: none;
  outline: none;
  line-height: 1.55;
  box-shadow: 0 0 0 1px rgba(255, 43, 214, 0.08) inset;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

textarea::placeholder {
  color: rgba(147, 164, 184, 0.72);
}

textarea:focus {
  border-color: var(--cyan);
  box-shadow:
    0 0 0 1px rgba(49, 247, 255, 0.4) inset,
    0 0 30px rgba(49, 247, 255, 0.18),
    0 0 42px rgba(255, 43, 214, 0.1);
  transform: translateY(-1px);
}

.status-message {
  min-height: 50px;
  display: flex;
  align-items: center;
  color: var(--muted);
  font-size: 0.96rem;
}

.status-message[hidden] {
  display: flex;
  visibility: hidden;
}

.export-row {
  display: block;
  min-height: 50px;
}

.qr-stage {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 100%;
  height: 100%;
  aspect-ratio: unset;
  padding: var(--qr-stage-padding);
  overflow: hidden;
  background: rgba(1, 5, 12, 0.88);
  border: 1px solid rgba(49, 247, 255, 0.26);
  border-radius: var(--radius);
  box-shadow:
    0 0 0 1px rgba(255, 43, 214, 0.12) inset,
    0 0 46px rgba(49, 247, 255, 0.12);
}

.qr-stage::before {
  position: absolute;
  inset: 9%;
  content: "";
  border: 1px solid rgba(198, 255, 61, 0.16);
  clip-path: polygon(
    0 0,
    22% 0,
    22% 2px,
    2px 2px,
    2px 22%,
    0 22%,
    0 0,
    78% 0,
    100% 0,
    100% 22%,
    calc(100% - 2px) 22%,
    calc(100% - 2px) 2px,
    78% 2px,
    78% 0,
    100% 78%,
    100% 100%,
    78% 100%,
    78% calc(100% - 2px),
    calc(100% - 2px) calc(100% - 2px),
    calc(100% - 2px) 78%,
    100% 78%,
    22% 100%,
    0 100%,
    0 78%,
    2px 78%,
    2px calc(100% - 2px),
    22% calc(100% - 2px),
    22% 100%
  );
}

.qr-stage.has-code::before {
  opacity: 0;
}

.qr-stage::after {
  position: absolute;
  right: 0;
  left: 0;
  top: -30%;
  height: 34%;
  content: "";
  pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(49, 247, 255, 0.14), transparent);
  animation: scan 3.4s linear infinite;
}

canvas {
  position: relative;
  z-index: 1;
  width: min(78%, calc(var(--surface-size) - 72px));
  max-width: 100%;
  max-height: 100%;
  height: auto;
  background: var(--paper);
  border-radius: 6px;
  image-rendering: pixelated;
  opacity: 0;
  transform: scale(0.98);
  box-shadow:
    0 0 0 10px rgba(255, 255, 255, 0.08),
    0 0 38px rgba(49, 247, 255, 0.24),
    0 0 70px rgba(255, 43, 214, 0.16);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.qr-stage.has-code canvas {
  opacity: 1;
  transform: scale(1);
}

.empty-state {
  position: absolute;
  z-index: 2;
  display: grid;
  place-items: center;
  width: min(46%, 220px);
  aspect-ratio: 1;
  color: var(--muted);
  border: 1px dashed rgba(49, 247, 255, 0.42);
  border-radius: var(--radius);
  background: rgba(2, 6, 14, 0.68);
  font-weight: 850;
  text-transform: uppercase;
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.qr-stage.has-code .empty-state {
  opacity: 0;
  transform: scale(0.96);
  pointer-events: none;
}

.download-button {
  min-height: 50px;
  width: 100%;
  padding: 0 22px;
  color: var(--ink);
  font-weight: 900;
  background: var(--lime);
  border: 0;
  border-radius: var(--radius);
  cursor: pointer;
  box-shadow:
    0 0 18px rgba(198, 255, 61, 0.3),
    0 0 34px rgba(49, 247, 255, 0.12);
  transition:
    transform 150ms ease,
    box-shadow 150ms ease,
    opacity 150ms ease,
    background 150ms ease;
}

.download-button:not(:disabled):hover {
  background: var(--cyan);
  transform: translateY(-1px);
  box-shadow:
    0 0 24px rgba(49, 247, 255, 0.42),
    0 0 42px rgba(255, 43, 214, 0.2);
}

.download-button:not(:disabled):active {
  transform: translateY(0);
}

.download-button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.site-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 12px;
  padding: 18px 0 0;
  color: rgba(147, 164, 184, 0.72);
  font-size: 0.86rem;
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 12px;
}

.footer-links a {
  color: rgba(244, 251, 255, 0.82);
  text-decoration: none;
  border-bottom: 1px solid rgba(49, 247, 255, 0.26);
  transition:
    border-color 150ms ease,
    color 150ms ease,
    text-shadow 150ms ease;
}

.footer-links a:hover {
  color: var(--lime);
  border-color: rgba(198, 255, 61, 0.65);
  text-shadow: 0 0 14px rgba(198, 255, 61, 0.28);
}

.is-error {
  color: var(--alert);
}

@keyframes scan {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(380%);
  }
}

@media (max-width: 920px) {
  .app-shell {
    width: min(100% - 24px, 760px);
    padding: 14px 0 18px;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .input-panel {
    grid-template-rows: auto minmax(140px, 22svh) auto;
  }

  .output-panel {
    grid-template-rows: auto minmax(280px, 60vw) auto;
  }

  .qr-stage {
    max-height: min(72svh, 680px);
  }
}

@media (max-width: 620px) {
  .app-shell {
    width: min(100% - 18px, 520px);
    gap: 12px;
  }

  .site-footer {
    flex-direction: column;
    gap: 6px;
    padding-top: 12px;
  }

  .footer-links {
    gap: 6px 12px;
  }

  .panel-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .mode-toggle {
    width: 100%;
    min-width: 0;
  }

  textarea {
    min-height: 130px;
    padding: 16px;
  }

  canvas {
    width: min(68vw, 240px);
  }

}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}