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

:root {
  --clr-bg: #f5f5f7;
  --clr-surface: #ffffff;
  --clr-text: #1a1a2e;
  --clr-text-muted: #6b7280;
  --clr-primary: #2563eb;
  --clr-primary-hover: #1d4ed8;
  --clr-border: #e5e7eb;
  --clr-error: #dc2626;
  --accent: #f59e0b;
  --accent2: #ec4899;
  --green: #10b981;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-lg: 0 4px 14px rgba(0,0,0,.08);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Header */
header {
  text-align: center;
}

header h1 {
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  margin-top: 0.25rem;
}

/* ===== TABS ===== */
.tabs {
  display: flex;
  gap: 0;
  background: var(--clr-border);
  border-radius: var(--radius-sm);
  padding: 3px;
}

.tab {
  flex: 1;
  padding: 0.5625rem 1rem;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  background: transparent;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: color .2s, background .2s, box-shadow .2s;
}

.tab:hover {
  color: var(--clr-text);
}

.tab.active {
  background: var(--clr-surface);
  color: var(--clr-text);
  box-shadow: var(--shadow);
}

/* Tab panels */
.tab-panel {
  display: none;
  flex-direction: column;
  gap: 1.25rem;
}

.tab-panel.active {
  display: flex;
}

/* ===== SHARED FORM STYLES ===== */
.input-section {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  position: relative;
}

.input-section label,
.options-section label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--clr-text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

textarea,
input[type="text"] {
  width: 100%;
  padding: 0.75rem 0.875rem;
  font-family: var(--font);
  font-size: 0.9375rem;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  transition: border-color .15s, box-shadow .15s;
  background: var(--clr-surface);
  color: var(--clr-text);
}

textarea {
  resize: vertical;
}

input[type="text"] {
  resize: none;
}

textarea:focus,
input[type="text"]:focus {
  outline: none;
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

textarea::placeholder,
input[type="text"]::placeholder {
  color: var(--clr-text-muted);
}

.char-count,
.hint {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  text-align: right;
}

.hint {
  text-align: left;
}

.error {
  font-size: 0.8125rem;
  color: var(--clr-error);
  min-height: 1.25rem;
}

/* Options */
.options-section {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
}

.options-barcode {
  grid-template-columns: 1fr 1fr 1fr;
}

.option-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

select {
  width: 100%;
  padding: 0.5rem 0.625rem;
  font-family: var(--font);
  font-size: 0.8125rem;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  background: var(--clr-surface);
  color: var(--clr-text);
  cursor: pointer;
  transition: border-color .15s;
}

select:focus {
  outline: none;
  border-color: var(--clr-primary);
}

.color-input-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 32px;
  height: 32px;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: 2px;
  cursor: pointer;
  background: var(--clr-surface);
}

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

input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 4px;
}

input[type="color"]::-moz-color-swatch {
  border: none;
  border-radius: 4px;
}

#qr-fg-hex,
#qr-bg-hex {
  font-size: 0.75rem;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  color: var(--clr-text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.25rem;
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .15s, transform .1s, box-shadow .15s;
}

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

.btn-primary {
  width: 100%;
  background: var(--clr-primary);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(37,99,235,.2);
}

.btn-primary:hover {
  background: var(--clr-primary-hover);
}

.btn-primary:focus-visible {
  outline: 2px solid var(--clr-primary);
  outline-offset: 2px;
}

.btn-secondary {
  flex: 1;
  background: var(--clr-surface);
  color: var(--clr-text);
  border: 1.5px solid var(--clr-border);
  box-shadow: var(--shadow);
  font-size: 0.8125rem;
  padding: 0.625rem 0.5rem;
}

.btn-secondary:hover {
  background: #f9fafb;
}

/* Result */
.result-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  animation: fadeUp .3s ease;
}

.hidden {
  display: none !important;
}

.qr-output {
  background: var(--clr-surface);
  padding: 1.25rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-output canvas {
  display: block;
  border-radius: 4px;
}

.barcode-output {
  background: var(--clr-surface);
  padding: 1.25rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: auto;
  max-width: 100%;
}

.barcode-output svg {
  display: block;
}

.download-group {
  display: flex;
  gap: 0.5rem;
  width: 100%;
}

/* ===== COPYRIGHT FOOTER ===== */
.footer {
  text-align: center;
  padding-top: 0.5rem;
  pointer-events: none;
  user-select: none;
}

.footer-inner {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  background: var(--clr-surface);
  border: 2px solid transparent;
  background-image: linear-gradient(var(--clr-surface), var(--clr-surface)),
                    linear-gradient(135deg, var(--accent), var(--accent2), var(--green));
  background-origin: border-box;
  background-clip: padding-box, border-box;
}

.footer-crown {
  font-size: 1rem;
  display: inline-block;
  animation: crownBob 2s ease-in-out infinite;
}

.footer-crown:last-child {
  animation-delay: 0.3s;
}

.footer-text {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: linear-gradient(90deg, var(--accent), var(--accent2), var(--green), var(--accent));
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 3s linear infinite;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes crownBob {
  0%, 100% { transform: translateY(0) rotate(-5deg); }
  50%      { transform: translateY(-2px) rotate(5deg); }
}

@keyframes shimmer {
  0%   { background-position: 0% center; }
  100% { background-position: 200% center; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 400px) {
  .container {
    padding: 1.75rem 1rem 1.5rem;
  }

  .options-section {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  header h1 {
    font-size: 1.375rem;
  }
}