:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-raised: #273449;
  --border: #334155;
  --border-soft: rgb(148 163 184 / 0.14);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --placeholder: #7d8ba1;
  --accent: #4ade80;
  --accent-hover: #86efac;
  --accent-ink: #052e16;
  --accent-soft: rgb(74 222 128 / 0.12);
  --accent-ring: rgb(74 222 128 / 0.28);
  --warning: #fbbf24;
  --warning-text: #fde68a;
  --radius: 12px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 14px 34px -14px rgb(0 0 0 / 0.6);
  --speed: 200ms;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}

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

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(900px 420px at 12% -140px, rgb(74 222 128 / 0.1), transparent 70%),
    var(--bg);
  color: var(--text);
  font: 400 1rem/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

a {
  color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.icon {
  width: 20px;
  height: 20px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- Header ---------- */

.topbar__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand__logo {
  width: 30px;
  height: 30px;
  flex: none;
  border-radius: 8px;
  box-shadow: 0 6px 18px -6px rgb(74 222 128 / 0.65);
}

.brand__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 750;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar__actions {
  display: flex;
  gap: 8px;
  flex: none;
}

.reset-icon {
  display: none;
}

@media (min-width: 480px) {
  .brand__logo {
    width: 34px;
    height: 34px;
  }

  .brand__title {
    font-size: 1.1875rem;
  }

  .reset-icon {
    display: block;
  }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 650;
  line-height: 1.1;
  white-space: nowrap;
  cursor: pointer;
  touch-action: manipulation;
  transition:
    background-color var(--speed) var(--ease),
    border-color var(--speed) var(--ease),
    color var(--speed) var(--ease),
    box-shadow var(--speed) var(--ease),
    transform 150ms var(--ease);
}

.btn .icon {
  width: 18px;
  height: 18px;
}

.btn:hover:not(:disabled) {
  border-color: rgb(74 222 128 / 0.55);
  background: var(--surface-raised);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn--primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 10px 24px -14px rgb(74 222 128 / 0.9);
}

.btn--primary:hover:not(:disabled) {
  border-color: var(--accent-hover);
  background: var(--accent-hover);
}

.btn--ghost {
  background: transparent;
}

.btn--lang {
  min-width: 48px;
  padding: 0 12px;
  font-weight: 750;
  letter-spacing: 0.06em;
}

/* ---------- Layout ---------- */

.layout {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 2px 16px 24px;
  flex: 1 0 auto;
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "content"
    "preview"
    "options";
  align-content: start;
}

.card--content {
  grid-area: content;
}

.card--preview {
  grid-area: preview;
}

.card--options {
  grid-area: options;
}

@media (min-width: 900px) {
  .layout {
    padding: 4px 24px 32px;
    gap: 18px;
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    grid-template-rows: auto 1fr;
    grid-template-areas:
      "content preview"
      "options preview";
    align-items: start;
  }

  .card--preview {
    position: sticky;
    top: 20px;
  }
}

/* ---------- Cards ---------- */

.card {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

@media (min-width: 640px) {
  .card {
    padding: 20px;
  }
}

.card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.card__title {
  margin: 0;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.3;
  text-transform: uppercase;
}

.card--content > .card__title {
  margin-bottom: 14px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
}

.badge::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgb(74 222 128 / 0.18);
}

/* ---------- Content type tabs ---------- */

.types {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

@media (min-width: 560px) {
  .types {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

.type {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 58px;
  padding: 7px 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 650;
  line-height: 1.15;
  text-align: center;
  cursor: pointer;
  touch-action: manipulation;
  transition:
    background-color var(--speed) var(--ease),
    border-color var(--speed) var(--ease),
    color var(--speed) var(--ease);
}

.type .icon {
  width: 22px;
  height: 22px;
}

.type:hover {
  border-color: #475569;
  color: var(--text);
}

.type[aria-selected="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--text);
}

.type[aria-selected="true"] .icon {
  color: var(--accent);
}

.type-hint {
  margin: 10px 0 12px;
  color: var(--muted);
  font-size: 0.875rem;
}

/* ---------- Form fields ---------- */

.fields {
  display: grid;
  gap: 12px;
}

@media (min-width: 640px) {
  .fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .field--wide,
  .fields > :last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.field__label {
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 600;
}

.input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.4;
  transition:
    border-color var(--speed) var(--ease),
    box-shadow var(--speed) var(--ease),
    opacity var(--speed) var(--ease);
}

.input::placeholder {
  color: var(--placeholder);
}

.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ring);
}

.input:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

textarea.input {
  min-height: 104px;
  resize: vertical;
}

select.input {
  padding-right: 40px;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-position: right 12px center;
  background-repeat: no-repeat;
  background-size: 18px;
  cursor: pointer;
}

.input-group {
  position: relative;
}

.input-group .input {
  padding-right: 52px;
}

.icon-button {
  position: absolute;
  top: 2px;
  right: 2px;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color var(--speed) var(--ease), background-color var(--speed) var(--ease);
}

.icon-button:hover:not(:disabled) {
  background: var(--surface);
  color: var(--text);
}

.icon-button[aria-pressed="true"] {
  color: var(--accent);
}

.icon-button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.check {
  display: flex;
  align-items: center;
  align-self: end;
  gap: 10px;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-size: 0.9375rem;
  cursor: pointer;
  user-select: none;
}

.check input {
  flex: none;
  width: 20px;
  height: 20px;
  margin: 0;
  border: 2px solid var(--muted);
  border-radius: 6px;
  appearance: none;
  background: transparent center / 14px no-repeat;
  cursor: pointer;
  transition: background-color 150ms var(--ease), border-color 150ms var(--ease);
}

.check input:checked {
  border-color: var(--accent);
  background-color: var(--accent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23052e16' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m5 12.5 4.5 4.5L19 7.5'/%3E%3C/svg%3E");
}

/* ---------- Preview ---------- */

.preview {
  display: grid;
  grid-template: minmax(0, 1fr) / minmax(0, 1fr);
  width: 100%;
  max-width: 340px;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  padding: 12px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 50% 40%, rgb(74 222 128 / 0.06), transparent 65%),
    var(--bg);
  transition: border-color var(--speed) var(--ease);
}

.preview.has-code {
  border-color: transparent;
}

.preview__stage {
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
}

.preview__code {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 20px 44px -20px rgb(0 0 0 / 0.8);
  animation: appear 220ms var(--ease);
}

.placeholder {
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 8px;
  padding: 12px;
  color: var(--muted);
  text-align: center;
}

.placeholder__icon {
  width: 64px;
  height: 64px;
  margin-bottom: 4px;
  opacity: 0.55;
}

.preview.is-error .placeholder__icon {
  color: var(--warning);
  opacity: 0.9;
}

.placeholder__title {
  margin: 0;
  color: var(--text);
  font-weight: 700;
}

.placeholder__text {
  max-width: 30ch;
  margin: 0;
  font-size: 0.875rem;
}

@keyframes appear {
  from {
    opacity: 0;
    transform: scale(0.97);
  }
}

.warning {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 14px 0 0;
  padding: 10px 12px;
  border: 1px solid rgb(251 191 36 / 0.38);
  border-radius: var(--radius-sm);
  background: rgb(251 191 36 / 0.1);
  color: var(--warning-text);
  font-size: 0.875rem;
}

.warning .icon {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  color: var(--warning);
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 16px 0 0;
}

.stat {
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  background: rgb(15 23 42 / 0.55);
}

.stat--wide {
  grid-column: 1 / -1;
}

@media (min-width: 560px) {
  .stats {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1fr) minmax(0, 1.35fr);
  }

  .stat--wide {
    grid-column: auto;
  }
}

.stat dt {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
}

.stat dd {
  margin: 2px 0 0;
  font-size: 0.9375rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.stat .stat__meter {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
}

.stat__percent {
  min-width: 3ch;
  color: var(--accent);
  font-size: 0.75rem;
  text-align: right;
}

.meter {
  flex: 1;
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--border);
}

.meter__fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #22c55e, var(--accent));
  transition: width var(--speed) var(--ease);
}

.details {
  min-height: 1.5em;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.actions .btn {
  width: 100%;
  padding: 0 10px;
}

.actions .btn--primary {
  grid-column: 1 / -1;
}

@media (min-width: 560px) {
  .actions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .actions .btn {
    gap: 6px;
    padding: 0 8px;
    font-size: 0.875rem;
  }

  .actions .btn--primary {
    grid-column: auto;
  }
}

.note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.8125rem;
  text-align: center;
}

.note .icon {
  width: 16px;
  height: 16px;
  color: var(--accent);
}

.shortcuts {
  display: none;
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.75rem;
  text-align: center;
}

@media (hover: hover) and (pointer: fine) {
  .shortcuts {
    display: block;
  }
}

/* ---------- Options ---------- */

.card--options {
  padding: 0;
}

.options-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  min-height: 50px;
  padding: 0 16px;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--speed) var(--ease);
}

.options-toggle:hover {
  color: var(--text);
}

.options-toggle .icon {
  transition: transform var(--speed) var(--ease);
}

.options-toggle[aria-expanded="true"] .icon {
  transform: rotate(180deg);
}

.options {
  display: grid;
  gap: 16px;
  padding: 0 16px 18px;
}

@media (min-width: 640px) {
  .options-toggle {
    padding: 0 20px;
  }

  .options {
    padding: 0 20px 20px;
  }
}

.option {
  min-width: 0;
}

.option__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.option__label {
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 600;
}

.option__value {
  color: var(--text);
  font-size: 0.8125rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.option__hint {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.8125rem;
}

.option-grid {
  display: grid;
  gap: 14px 16px;
}

@media (min-width: 480px) {
  .option-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.segmented {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}

.seg {
  position: relative;
  display: block;
}

.seg input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.seg__body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 8px;
  color: var(--muted);
  pointer-events: none;
  transition:
    background-color var(--speed) var(--ease),
    color var(--speed) var(--ease),
    box-shadow var(--speed) var(--ease);
}

.seg__letter {
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.1;
}

.seg__percent {
  font-size: 0.6875rem;
  font-weight: 600;
}

.seg:hover .seg__body {
  color: var(--text);
}

.seg input:checked + .seg__body {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 6px 16px -8px rgb(74 222 128 / 0.8);
}

.seg input:focus-visible + .seg__body {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.range {
  --fill: 50%;
  display: block;
  width: 100%;
  height: 40px;
  margin: 0;
  background: transparent;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.range:focus-visible {
  outline: none;
}

.range::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(to right, var(--accent) var(--fill), var(--border) var(--fill));
}

.range::-webkit-slider-thumb {
  width: 22px;
  height: 22px;
  margin-top: -8px;
  border: 3px solid var(--accent);
  border-radius: 50%;
  background: var(--text);
  box-shadow: 0 2px 8px rgb(0 0 0 / 0.45);
  -webkit-appearance: none;
  appearance: none;
  transition: transform 150ms var(--ease), box-shadow var(--speed) var(--ease);
}

.range:active::-webkit-slider-thumb {
  transform: scale(1.12);
}

.range:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 0 0 5px var(--accent-ring);
}

.range::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: var(--border);
}

.range::-moz-range-progress {
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
}

.range::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 3px solid var(--accent);
  border-radius: 50%;
  background: var(--text);
}

.range:focus-visible::-moz-range-thumb {
  box-shadow: 0 0 0 5px var(--accent-ring);
}

.color {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  min-height: 56px;
  padding: 5px 12px 5px 5px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  cursor: pointer;
  transition: border-color var(--speed) var(--ease);
}

.color:hover {
  border-color: #475569;
}

.color input {
  flex: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgb(148 163 184 / 0.35);
  border-radius: 8px;
  background: none;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.color input::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color input::-webkit-color-swatch {
  border: 0;
  border-radius: 7px;
}

.color input::-moz-color-swatch {
  border: 0;
  border-radius: 7px;
}

.color__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.color__name {
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 600;
}

.color__hex {
  font-family: var(--mono);
  font-size: 0.9375rem;
}

.contrast {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: -4px 0 0;
  color: var(--muted);
  font-size: 0.8125rem;
}

.contrast::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.contrast.is-low {
  color: var(--warning-text);
}

.contrast.is-low::before {
  background: var(--warning);
}

/* ---------- Footer and toast ---------- */

.footer {
  padding: 4px 16px 24px;
  color: var(--muted);
  font-size: 0.8125rem;
  text-align: center;
}

.footer p {
  margin: 0;
}

.footer a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 6px;
  font-weight: 650;
  text-decoration: none;
}

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

.footer__small {
  font-size: 0.75rem;
}

.toast {
  position: fixed;
  right: 16px;
  bottom: 20px;
  left: 16px;
  z-index: 10;
  width: fit-content;
  max-width: 480px;
  margin: 0 auto;
  padding: 10px 16px;
  border: 1px solid rgb(74 222 128 / 0.5);
  border-radius: 999px;
  background: #0b1324;
  box-shadow: var(--shadow);
  font-size: 0.875rem;
  text-align: center;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity var(--speed) var(--ease), transform var(--speed) var(--ease);
}

.toast:empty {
  display: none;
}

.toast.is-visible {
  opacity: 1;
  transform: none;
}

.toast[data-tone="error"] {
  border-color: rgb(248 113 113 / 0.6);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}