:root {
  --bg: #0d0d0d;
  --bg2: #111111;
  --bg3: #161616;
  --border: #1e2430;
  --green: #00ff88;
  --green-dim: #00cc6a;
  --green-glow: rgba(0, 255, 136, 0.25);
  --cyan: #00d4ff;
  --cyan-glow: rgba(0, 212, 255, 0.2);
  --text: #c8d4e0;
  --text-dim: #6b7c8f;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --radius: 6px;
}

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

html {
  color-scheme: dark;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.tool-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px 24px;
  padding: 16px 28px;
  border-bottom: 1px solid var(--border);
  background: rgba(13, 13, 13, 0.95);
  backdrop-filter: blur(8px);
}

.back-link {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 12px;
  transition: color 0.15s;
  flex-shrink: 0;
}

.back-link:hover {
  color: var(--green);
}

.header-titles {
  flex: 1 1 auto;
  min-width: 0;
}

.tool-header h1 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.tool-header .accent {
  color: var(--green);
  text-shadow: 0 0 20px var(--green-glow);
}

.free-badge {
  margin-top: 2px;
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

.lang-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  align-items: center;
  margin-left: auto;
}

.lang-link {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 11px;
  padding: 3px 6px;
  border: 1px solid transparent;
  border-radius: 4px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.lang-link:hover {
  color: var(--green);
}

.lang-link--active,
.lang-link[aria-current="page"] {
  color: var(--green);
  border-color: var(--border);
  background: var(--bg3);
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 380px) minmax(0, 1fr);
  gap: 0;
  min-height: calc(100vh - 65px);
}

.panel {
  border-right: 1px solid var(--border);
  padding: 20px 24px 40px;
  overflow-y: auto;
  max-height: calc(100vh - 65px);
}

.section {
  margin-bottom: 28px;
}

.section h2 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.field--inline {
  flex: 1;
}

.label {
  font-size: 11px;
  color: var(--text-dim);
}

textarea,
select,
input[type="text"] {
  width: 100%;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  padding: 10px 12px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

textarea {
  resize: vertical;
  min-height: 72px;
}

textarea:focus,
select:focus,
input[type="text"]:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 2px var(--green-glow);
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236b7c8f'%3E%3Cpath d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.color-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.color-swatch {
  position: relative;
  display: block;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.color-swatch:hover {
  border-color: var(--green);
  box-shadow: 0 0 0 2px var(--green-glow);
}

.color-swatch--checker {
  background:
    linear-gradient(45deg, #2a2a2a 25%, transparent 25%),
    linear-gradient(-45deg, #2a2a2a 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2a2a2a 75%),
    linear-gradient(-45deg, transparent 75%, #2a2a2a 75%);
  background-size: 10px 10px;
  background-position: 0 0, 0 5px, 5px -5px, -5px 0;
  background-color: #1a1a1a;
}

.color-swatch input[type="color"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  padding: 0;
  border: none;
  cursor: pointer;
  background: transparent;
}

.color-swatch input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-swatch input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 0;
}

.color-hex {
  flex: 1;
  min-width: 0;
  text-transform: lowercase;
  font-size: 12px;
  padding: 8px 10px;
}

.field.is-disabled,
.color-control:has(:disabled) {
  opacity: 0.45;
  pointer-events: none;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  appearance: none;
  background: var(--border);
  border-radius: 2px;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green-glow);
  cursor: pointer;
}

input[type="file"] {
  font-size: 12px;
  color: var(--text-dim);
}

input[type="file"]::file-selector-button {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--mono);
  font-size: 11px;
  padding: 6px 12px;
  margin-right: 10px;
  cursor: pointer;
  transition: border-color 0.15s;
}

input[type="file"]::file-selector-button:hover {
  border-color: var(--green);
}

.color-row {
  display: flex;
  gap: 12px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  cursor: pointer;
  user-select: none;
}

.toggle input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-track {
  position: relative;
  width: 36px;
  height: 20px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  flex-shrink: 0;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.toggle-track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background: var(--text-dim);
  border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
}

.toggle input:checked + .toggle-track {
  background: rgba(0, 255, 136, 0.15);
  border-color: var(--green);
  box-shadow: 0 0 10px var(--green-glow);
}

.toggle input:checked + .toggle-track::after {
  transform: translateX(16px);
  background: var(--green);
}

.toggle-label {
  font-size: 12px;
  color: var(--text);
}

.sub-options {
  padding: 12px;
  margin-bottom: 12px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.hint {
  font-size: 11px;
  color: var(--cyan);
  margin-top: 4px;
}

.preview-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 32px;
  gap: 28px;
  position: sticky;
  top: 65px;
  align-self: start;
  min-height: calc(100vh - 65px);
}

.preview-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.qr-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 280px;
  min-height: 280px;
  padding: 24px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow:
    0 0 0 1px rgba(0, 255, 136, 0.05),
    0 16px 48px rgba(0, 0, 0, 0.4);
}

.qr-preview--checker {
  background:
    linear-gradient(45deg, #1e1e1e 25%, transparent 25%),
    linear-gradient(-45deg, #1e1e1e 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1e1e1e 75%),
    linear-gradient(-45deg, transparent 75%, #1e1e1e 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-color: #141414;
}

.qr-preview canvas,
.qr-preview svg {
  display: block;
  max-width: 100%;
  height: auto;
}

.preview-hint {
  font-size: 11px;
  color: var(--text-dim);
}

.download-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  padding: 12px 24px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.15s, border-color 0.15s;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--green);
  color: var(--bg);
  border-color: var(--green);
  box-shadow: 0 0 20px var(--green-glow);
}

.btn--primary:hover {
  box-shadow: 0 0 28px var(--green-glow), 0 0 8px var(--cyan-glow);
}

.btn--secondary {
  background: transparent;
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 12px var(--cyan-glow);
}

.btn--secondary:hover {
  background: rgba(0, 212, 255, 0.08);
}

.btn--ghost {
  background: transparent;
  color: var(--text-dim);
  border-color: var(--border);
  padding: 8px 14px;
  font-size: 11px;
}

.btn--ghost:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .panel {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: none;
  }

  .preview-col {
    padding: 32px 20px 48px;
  }
}

.tool-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  padding: 16px 28px 28px;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 12px;
}

.tool-footer-link {
  color: var(--text-dim);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.tool-footer-link:hover {
  color: var(--green);
}

.tool-footer-button {
  border: 0;
  background: transparent;
  font: inherit;
  cursor: pointer;
  padding: 0;
}

.cookie-prefs-status {
  color: var(--text-dim);
  font-size: 12px;
}