/* ============================================================
   QR//GEN — Stylesheet
   ============================================================ */

:root {
  --bg: #0a0e0a;
  --bg-soft: #0f140f;
  --panel: #111811;
  --border: #1f2a1f;
  --border-hot: #2b3f2b;
  --fg: #c8e6c8;
  --fg-dim: #6a826a;
  --accent: #00ff9c;
  --accent-dim: #00b873;
  --danger: #ff3e5f;
  --warn: #ffb347;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(0, 255, 156, 0.08), transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(0, 255, 156, 0.05), transparent 50%),
    repeating-linear-gradient(
      0deg,
      transparent 0,
      transparent 2px,
      rgba(0, 255, 156, 0.015) 2px,
      rgba(0, 255, 156, 0.015) 4px
    );
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
  opacity: 0.03;
  pointer-events: none;
  z-index: 1;
  mix-blend-mode: overlay;
}

.container {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

/* ------------------ Header ------------------ */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--border-hot);
  margin-bottom: 40px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 2px;
}

.brand-mark span {
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-dim);
}
.brand-mark span:nth-child(2),
.brand-mark span:nth-child(4),
.brand-mark span:nth-child(6),
.brand-mark span:nth-child(8) {
  background: transparent;
  border: 1px solid var(--accent-dim);
  box-shadow: none;
}

.brand-text {
  font-family: 'Space Mono', monospace;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 2px;
}
.brand-text .slash {
  color: var(--accent);
  margin: 0 1px;
}

.status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

/* ------------------ Hero ------------------ */
.hero {
  margin-bottom: 48px;
}
.hero-tag {
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 3px;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.hero-tag::before {
  content: '> ';
  opacity: 0.6;
}
.hero h1 {
  font-family: 'Space Mono', monospace;
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -1px;
  margin-bottom: 12px;
}
.hero h1 .hl {
  color: var(--accent);
  font-style: italic;
}
.hero p {
  color: var(--fg-dim);
  font-size: 14px;
  max-width: 540px;
  line-height: 1.6;
}

/* ------------------ Workspace ------------------ */
.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 860px) {
  .workspace { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  position: relative;
}
.panel-output {
  display: flex;
  flex-direction: column;
}
.panel::before {
  content: '';
  position: absolute;
  top: -1px; left: -1px;
  width: 12px; height: 12px;
  border-top: 2px solid var(--accent);
  border-left: 2px solid var(--accent);
}
.panel::after {
  content: '';
  position: absolute;
  bottom: -1px; right: -1px;
  width: 12px; height: 12px;
  border-bottom: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--fg-dim);
  background: var(--bg-soft);
}
.panel-header .badge {
  color: var(--accent);
  font-weight: 700;
}
.panel-body {
  padding: 24px 20px;
}
.panel-body-output {
  display: flex;
  flex-direction: column;
  flex: 1;
}

/* ------------------ Form ------------------ */
.field {
  margin-bottom: 20px;
}
.field label {
  display: block;
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 8px;
}
.field label::before {
  content: '// ';
  color: var(--accent-dim);
}

textarea, input[type="text"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border-hot);
  color: var(--fg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  padding: 12px 14px;
  resize: vertical;
  transition: border-color .15s, box-shadow .15s;
}
textarea {
  min-height: 110px;
  line-height: 1.5;
}
textarea:focus, input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 255, 156, 0.15);
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border-hot);
  color: var(--fg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  padding: 10px 12px;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2300ff9c' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

input[type="range"] {
  width: 100%;
  appearance: none;
  background: var(--border-hot);
  height: 2px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 14px; height: 14px;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg);
  box-shadow: 0 0 8px var(--accent-dim);
}
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg);
}

.color-group {
  display: flex;
  gap: 10px;
  align-items: center;
}
.color-swatch {
  position: relative;
  width: 42px; height: 34px;
  border: 1px solid var(--border-hot);
  cursor: pointer;
  overflow: hidden;
  flex-shrink: 0;
}
.color-swatch input {
  position: absolute;
  inset: -4px;
  width: calc(100% + 8px);
  height: calc(100% + 8px);
  border: none;
  cursor: pointer;
  background: transparent;
}
.color-label {
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 1px;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.color-hex {
  color: var(--accent);
}

.slider-value {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--fg-dim);
  letter-spacing: 1px;
  margin-top: 6px;
}
.slider-value span:nth-child(2) {
  color: var(--accent);
}

/* ------------------ Preview ------------------ */
.preview-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  min-height: 380px;
  padding: 24px;
  flex: 1;
}

.qr-stage {
  position: relative;
  padding: 20px;
  background: var(--bg);
  border: 1px dashed var(--border-hot);
}
.qr-stage::before, .qr-stage::after {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  border-color: var(--accent);
  border-style: solid;
}
.qr-stage::before {
  top: -1px; left: -1px;
  border-width: 1px 0 0 1px;
}
.qr-stage::after {
  bottom: -1px; right: -1px;
  border-width: 0 1px 1px 0;
}

#qrcode {
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  padding: 16px;
  transition: opacity .2s;
  max-width: 100%;
}
#qrcode img, #qrcode canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

.preview-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 24px;
  font-size: 10px;
  color: var(--fg-dim);
  letter-spacing: 2px;
  text-transform: uppercase;
}
.preview-meta b {
  color: var(--accent);
  font-weight: 400;
}

/* ------------------ Buttons ------------------ */
.actions {
  display: flex;
  gap: 10px;
  width: 100%;
  margin-top: auto;
  flex-wrap: wrap;
}

button {
  flex: 1;
  background: transparent;
  border: 1px solid var(--border-hot);
  color: var(--fg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 14px 18px;
  cursor: pointer;
  transition: all .15s;
  position: relative;
  overflow: hidden;
  min-width: 0;
}
button:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0, 255, 156, 0.04);
}
button.primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 700;
}
button.primary:hover {
  background: transparent;
  color: var(--accent);
  box-shadow: 0 0 20px rgba(0, 255, 156, 0.3);
}
button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
button .arrow {
  display: inline-block;
  transition: transform .15s;
}
button:hover .arrow {
  transform: translateX(3px);
}

/* ------------------ Presets (fixed overflow) ------------------ */
.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.preset {
  flex: 0 0 auto;        /* don't stretch, don't shrink — fits content */
  font-size: 10px;
  padding: 6px 12px;
  border: 1px solid var(--border-hot);
  background: transparent;
  color: var(--fg-dim);
  cursor: pointer;
  letter-spacing: 1.5px;
  min-width: 0;
  text-transform: uppercase;
  width: auto;
}
.preset:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(0, 255, 156, 0.04);
}

/* ------------------ Footer ------------------ */
footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px dashed var(--border-hot);
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--fg-dim);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  flex-wrap: wrap;
  gap: 12px;
}
footer .credit a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
  transition: text-shadow .15s;
}
footer .credit a:hover {
  text-shadow: 0 0 8px rgba(0, 255, 156, 0.6);
  text-decoration: underline;
}

/* ------------------ Terminal effects ------------------ */
.cursor::after {
  content: '_';
  color: var(--accent);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink {
  50% { opacity: 0; }
}

.brand-text, .hero h1 {
  animation: flicker 8s infinite;
}
@keyframes flicker {
  0%, 98%, 100% { opacity: 1; }
  99% { opacity: 0.88; }
}

/* ------------------ Empty state ------------------ */
.empty {
  color: var(--fg-dim);
  font-size: 12px;
  text-align: center;
  line-height: 1.8;
  letter-spacing: 1px;
  padding: 40px 20px;
}
.empty strong { color: var(--accent); }

/* ------------------ Mobile tweaks ------------------ */
@media (max-width: 520px) {
  .container { padding: 20px 16px 40px; }
  header { margin-bottom: 28px; }
  .hero { margin-bottom: 32px; }
  .panel-body { padding: 20px 16px; }
  .row { grid-template-columns: 1fr; }
  .actions { flex-direction: column; }
  button { flex: 1 1 100%; }
  footer { flex-direction: column; align-items: flex-start; }
}