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

:root {
  --bg: #2a2a2e;
  --bg-gradient: linear-gradient(145deg, #32323a 0%, #1e1e22 100%);
  --surface: linear-gradient(0deg, rgba(63, 63, 63, 0.1) 0%, rgba(255, 255, 255, 0.1) 100%);
  --surface-solid: #35353a;
  --text: #e8e8ed;
  --text-muted: #8e8e93;
  --border: rgba(255, 255, 255, 0.08);
  --primary: hsl(126.453, 65%, 45%);
  --primary-hover: hsl(126.453, 65%, 50%);
  --primary-glow: hsla(126.453, 65%, 45%, 0.3);

  /* Neumorphic shadows */
  --card-shadow:
    rgba(255, 255, 255, 0.07) 0px 0px 2px 0px,
    rgba(0, 0, 0, 0.5) 0px 6px 6px -4px,
    rgba(0, 0, 0, 0.4) 0px 8px 24px -2px,
    rgba(0, 0, 0, 0.25) 0px 0px 20px 0px inset,
    rgba(255, 255, 255, 0.1) 0px 1px 2px 0px inset;
  --input-shadow:
    rgba(255, 255, 255, 0.05) 0px 0px 2px 0px,
    rgba(0, 0, 0, 0.6) 0px 2px 8px 0px inset;
  --button-shadow:
    rgba(255, 255, 255, 0.1) 0px 1px 1px 0px inset,
    rgba(0, 0, 0, 0.3) 0px 4px 8px -2px,
    rgba(0, 0, 0, 0.2) 0px 2px 4px -1px;
  --button-shadow-hover:
    rgba(255, 255, 255, 0.15) 0px 1px 1px 0px inset,
    rgba(0, 0, 0, 0.4) 0px 6px 12px -2px,
    rgba(0, 0, 0, 0.25) 0px 3px 6px -1px;
  --button-shadow-active:
    rgba(0, 0, 0, 0.4) 0px 2px 6px 0px inset,
    rgba(255, 255, 255, 0.05) 0px 1px 1px 0px;

  --radius: 16px;
  --radius-sm: 10px;
}

/* Screen reader only - visually hidden but accessible */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus visible indicator for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Remove default focus for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #d8d8dc;
    --bg-gradient: linear-gradient(145deg, #e2e2e6 0%, #c8c8cc 100%);
    --surface: linear-gradient(0deg, rgba(0, 0, 0, 0.03) 0%, rgba(255, 255, 255, 0.5) 100%);
    --surface-solid: #e0e0e4;
    --text: #1d1d1f;
    --text-muted: #6e6e73;
    --border: rgba(0, 0, 0, 0.08);
    --primary: hsl(126.453, 65%, 38%);
    --primary-hover: hsl(126.453, 65%, 33%);
    --primary-glow: hsla(126.453, 65%, 40%, 0.25);

    --card-shadow:
      rgba(255, 255, 255, 0.7) 0px 0px 2px 0px,
      rgba(0, 0, 0, 0.15) 0px 6px 6px -4px,
      rgba(0, 0, 0, 0.1) 0px 8px 24px -2px,
      rgba(0, 0, 0, 0.06) 0px 0px 20px 0px inset,
      rgba(255, 255, 255, 0.8) 0px 1px 2px 0px inset;
    --input-shadow:
      rgba(255, 255, 255, 0.6) 0px 0px 2px 0px,
      rgba(0, 0, 0, 0.12) 0px 2px 8px 0px inset;
    --button-shadow:
      rgba(255, 255, 255, 0.5) 0px 1px 1px 0px inset,
      rgba(0, 0, 0, 0.12) 0px 4px 8px -2px,
      rgba(0, 0, 0, 0.08) 0px 2px 4px -1px;
    --button-shadow-hover:
      rgba(255, 255, 255, 0.6) 0px 1px 1px 0px inset,
      rgba(0, 0, 0, 0.18) 0px 6px 12px -2px,
      rgba(0, 0, 0, 0.1) 0px 3px 6px -1px;
    --button-shadow-active:
      rgba(0, 0, 0, 0.15) 0px 2px 6px 0px inset,
      rgba(255, 255, 255, 0.4) 0px 1px 1px 0px;
  }

}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  background: var(--bg-gradient);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  gap: 24px;
}

.container {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

header {
  text-align: center;
}

header h1 {
  margin: 0 0 4px 0;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.5px;
}

header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
}

.card {
  background: var(--surface), var(--surface-solid);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 24px;
  border: 1px solid var(--border);
}

.input-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

textarea,
input[type="text"],
input[type="tel"],
input[type="datetime-local"] {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 15px;
  color: var(--text);
  background: rgba(0, 0, 0, 0.15);
  box-shadow: var(--input-shadow);
  transition: box-shadow 0.2s, border-color 0.2s;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

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

select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--input-shadow), 0 0 0 2px var(--primary-glow);
}

textarea::placeholder,
input::placeholder {
  color: var(--text-muted);
}

.form-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group textarea {
  min-height: 80px;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
}

.checkbox-group input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--primary);
}

.checkbox-group label {
  text-transform: none;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
}

.options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.option-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.option-group.full-width {
  grid-column: 1 / -1;
}

.options .option-group select {
  padding: 10px 12px;
  font-size: 14px;
}

.output-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.qr-container {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  background: rgba(0, 0, 0, 0.1);
  border-radius: var(--radius-sm);
  box-shadow: var(--input-shadow);
}

.qr-container img {
  display: block;
  max-width: 100%;
  height: auto;
  image-rendering: pixelated;
  border-radius: 4px;
}

.qr-placeholder {
  color: var(--text-muted);
  font-size: 14px;
  text-align: center;
  padding: 40px 20px;
}

.actions {
  display: flex;
  gap: 12px;
  width: 100%;
}

button {
  flex: 1;
  padding: 14px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: box-shadow 0.2s, transform 0.1s, background 0.2s;
}

.btn-primary {
  background: linear-gradient(180deg, var(--primary-hover) 0%, var(--primary) 100%);
  color: #ffffff;
  border-color: transparent;
  box-shadow: var(--button-shadow), inset 0 1px 0 rgba(255,255,255,0.2);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.btn-primary:hover {
  box-shadow: var(--button-shadow-hover), inset 0 1px 0 rgba(255,255,255,0.25);
  filter: brightness(1.05);
}

.btn-primary:active {
  box-shadow: var(--button-shadow-active);
  transform: translateY(1px);
  filter: brightness(0.95);
}

.btn-secondary {
  background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, rgba(0,0,0,0.05) 100%), var(--surface-solid);
  color: var(--text);
  box-shadow: var(--button-shadow);
}

.btn-secondary:hover {
  box-shadow: var(--button-shadow-hover);
  filter: brightness(1.05);
}

.btn-secondary:active {
  box-shadow: var(--button-shadow-active);
  transform: translateY(1px);
}

.btn-secondary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  filter: none;
  transform: none;
}

.btn-secondary:disabled:hover {
  box-shadow: var(--button-shadow);
}

footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
}

footer a {
  color: var(--primary);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

.keyboard-hint {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

kbd {
  display: inline-block;
  padding: 3px 7px;
  font-family: inherit;
  font-size: 11px;
  color: var(--text);
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border);
  border-radius: 5px;
  box-shadow: var(--input-shadow);
}

/* Custom Dropdown */
.custom-select {
  position: relative;
  width: 100%;
}

.custom-select-trigger {
  width: 100%;
  padding: 14px 36px 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 15px;
  color: var(--text);
  background-color: var(--surface-solid);
  box-shadow: var(--input-shadow);
  cursor: pointer;
  text-align: left;
  position: relative;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.custom-select-trigger::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238e8e93' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  transition: transform 0.2s;
}

.custom-select.open .custom-select-trigger::after {
  transform: translateY(-50%) rotate(180deg);
}

.custom-select-trigger:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--input-shadow), 0 0 0 2px var(--primary-glow);
}

.custom-select-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--card-shadow);
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.15s, transform 0.15s, visibility 0.15s;
  max-height: 240px;
  overflow-y: auto;

  /* Custom scrollbar - Firefox */
  scrollbar-width: thin;
  scrollbar-color: var(--text-muted) transparent;
}

/* Custom scrollbar - Webkit (Chrome, Safari, Edge) */
.custom-select-dropdown::-webkit-scrollbar {
  width: 8px;
}

.custom-select-dropdown::-webkit-scrollbar-track {
  background: transparent;
  border-radius: 4px;
}

.custom-select-dropdown::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

.custom-select-dropdown::-webkit-scrollbar-thumb:hover {
  background: var(--text);
  border: 2px solid transparent;
  background-clip: padding-box;
}

.custom-select.open .custom-select-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.custom-select-option {
  padding: 12px 16px;
  cursor: pointer;
  color: var(--text);
  transition: background-color 0.1s;
}

.custom-select-option:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

.custom-select-option.selected {
  background-color: var(--primary);
  color: #ffffff;
}

.custom-select-option:first-child {
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.custom-select-option:last-child {
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.custom-select-option:only-child {
  border-radius: var(--radius-sm);
}

.custom-select.disabled .custom-select-trigger {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.epc-override {
  margin-bottom: 4px;
  font-size: 13px;
  padding: 4px 0;
}

.epc-override label {
  font-size: 13px;
  color: var(--text-muted);
}

/* Smaller variant for options row */
.options .custom-select-trigger {
  padding: 10px 32px 10px 12px;
  font-size: 14px;
}

.options .custom-select-option {
  padding: 10px 12px;
  font-size: 14px;
}

@media (max-width: 480px) {
  body {
    padding: 16px;
  }

  .card {
    padding: 16px;
  }

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

  header h1 {
    font-size: 24px;
  }
}

/* Toasts (update + install) */
.update-toast,
.install-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--card-shadow);
  z-index: 1000;
  animation: toast-in 0.3s ease;
}

.update-toast span,
.install-toast span {
  font-size: 14px;
  color: var(--text);
}

.update-toast button,
.install-toast button {
  flex: none;
  padding: 8px 16px;
  font-size: 13px;
  background: linear-gradient(180deg, var(--primary-hover) 0%, var(--primary) 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: var(--button-shadow);
}

.update-toast button:hover,
.install-toast button:hover {
  filter: brightness(1.05);
}

.install-toast button.dismiss {
  background: transparent;
  color: var(--text-muted);
  box-shadow: none;
  padding: 4px 8px;
  font-size: 18px;
  line-height: 1;
}

.install-toast button.dismiss:hover {
  color: var(--text);
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(20px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* Plain mode — fullscreen QR only */
body.plain {
  padding: 0;
  background: white;
  min-height: 100vh;
  justify-content: center;
}
body.plain .container { max-width: none; gap: 0; }
body.plain header,
body.plain .card:first-of-type,
body.plain footer,
body.plain .keyboard-hint,
body.plain .actions,
body.plain .qr-placeholder,
body.plain .install-toast,
body.plain .update-toast { display: none !important; }
body.plain .card { background: none; box-shadow: none; border: none; padding: 0; border-radius: 0; }
body.plain .qr-container { background: none; box-shadow: none; padding: 0; border-radius: 0; }
body.plain .qr-container img { border-radius: 0; max-width: 100vmin; max-height: 100vmin; }

/* SEPA byte counter */
.sepa-byte-counter {
  font-size: 12px;
  color: var(--text-muted);
  text-align: right;
  padding: 4px 0;
  font-variant-numeric: tabular-nums;
}

.sepa-byte-counter.over-limit {
  color: #ff4444;
  font-weight: 600;
}

/* PayPal form hint */
.form-hint {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
  padding: 4px 0;
}

/* PayPal URL length counter */
.paypal-url-counter {
  font-size: 12px;
  color: var(--text-muted);
  text-align: right;
  padding: 4px 0;
  font-variant-numeric: tabular-nums;
}

/* Field validation error */
.field-error {
  border-color: #ff4444 !important;
  box-shadow: var(--input-shadow), 0 0 0 2px rgba(255, 68, 68, 0.3) !important;
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .custom-select-dropdown {
    transition: none;
  }

  .custom-select-trigger::after {
    transition: none;
  }
}