/* ---------------------------------------------------------------- tokens */
:root {
  color-scheme: dark;

  --bg: #0b0d12;
  --bg-elevated: #12151d;
  --bg-sunken: #090b0f;
  --surface: #171b25;
  --surface-hover: #1d222e;
  --border: #262c3a;
  --border-strong: #333b4d;

  --text: #e8ecf4;
  --text-muted: #99a3b8;
  --text-faint: #6b7488;

  --accent: #6ea8fe;
  --accent-strong: #4a8bfa;
  --accent-soft: rgba(110, 168, 254, 0.14);

  --good: #4ade80;
  --warn: #fbbf24;
  --bad: #f87171;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;

  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.25);
  --font:
    ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial,
    'Noto Sans', sans-serif;
  --mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
}

:root[data-theme='light'] {
  color-scheme: light;
  --bg: #f5f7fb;
  --bg-elevated: #ffffff;
  --bg-sunken: #eaeef6;
  --surface: #ffffff;
  --surface-hover: #f2f5fa;
  --border: #dde3ee;
  --border-strong: #c6cfe0;
  --text: #121722;
  --text-muted: #5a6478;
  --text-faint: #8a94a8;
  --accent: #2f6fe4;
  --accent-strong: #1e5bcc;
  --accent-soft: rgba(47, 111, 228, 0.1);
  --good: #16a34a;
  --warn: #b45309;
  --bad: #dc2626;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 8px 24px rgba(16, 24, 40, 0.08);
}

/* ------------------------------------------------------------------ base */
* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.01em;
}

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

[hidden] {
  display: none !important;
}

/* ---------------------------------------------------------------- topbar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.topbar__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  color: #0b0d12;
  font-size: 18px;
  font-weight: 700;
}

.topbar__title {
  font-size: 16px;
}

.topbar__tagline,
.topbar__privacy {
  margin: 0;
  font-size: 12px;
  color: var(--text-muted);
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.topbar__privacy::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: var(--good);
  vertical-align: middle;
}

/* ---------------------------------------------------------------- layout */
.layout {
  display: grid;
  grid-template-columns: minmax(320px, 400px) 1fr;
  gap: var(--space-5);
  align-items: start;
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-5);
}

.column {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-width: 0;
}

.column--output {
  position: sticky;
  top: 84px;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .column--output {
    position: static;
    order: -1;
  }
}

/* ----------------------------------------------------------- panels/cards */
.panel,
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel__title,
.export__title,
.preview__title,
.score__title {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.panel__title {
  padding: var(--space-4) var(--space-4) 0;
}

.panel__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-4);
}

.panel__lede {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-muted);
}

.divider {
  height: 1px;
  background: var(--border);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* --------------------------------------------------------------- controls */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.field__label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
}

.field__hint {
  margin: 0;
  font-size: 11px;
  line-height: 1.5;
  color: var(--text-faint);
}

.field__hint.is-error {
  color: var(--bad);
}

.textarea,
.select,
.color__hex {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
}

.textarea {
  resize: vertical;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
}

.payload {
  position: relative;
}

.counter {
  position: absolute;
  right: 10px;
  bottom: 8px;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--text-faint);
  background: var(--bg-sunken);
  padding: 0 4px;
}

.counter.is-warn {
  color: var(--warn);
}

.select {
  appearance: none;
  cursor: pointer;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--text-muted) 50%),
    linear-gradient(135deg, var(--text-muted) 50%, transparent 50%);
  background-position:
    calc(100% - 16px) 50%,
    calc(100% - 11px) 50%;
  background-size: 5px 5px;
  background-repeat: no-repeat;
  padding-right: 32px;
}

.slider {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.slider__input {
  flex: 1;
  min-width: 0;
  accent-color: var(--accent);
}

.slider__value {
  min-width: 56px;
  text-align: right;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
}

.color {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.color__swatch {
  width: 40px;
  height: 36px;
  padding: 2px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
  cursor: pointer;
}

.color__hex {
  font-family: var(--mono);
  text-transform: lowercase;
}

.segmented {
  display: flex;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
}

.segmented__item {
  flex: 1;
  padding: 7px 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  transition:
    background 0.12s,
    color 0.12s;
}

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

.segmented__item.is-active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.button {
  padding: 9px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition:
    background 0.12s,
    border-color 0.12s,
    opacity 0.12s;
}

.button--sm {
  padding: 5px 10px;
  font-size: 12px;
}

.button--primary {
  background: var(--accent-strong);
  color: #fff;
}

.button--primary:hover:not(:disabled) {
  background: var(--accent);
}

.button--ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}

.button--ghost:hover:not(:disabled) {
  background: var(--surface-hover);
}

.button--danger {
  background: var(--bad);
  color: #fff;
}

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

.file__input {
  display: none;
}

.file__row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.file__name {
  flex: 1;
  min-width: 0;
  font-size: 12px;
  color: var(--text-faint);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file__error {
  margin: var(--space-2) 0 0;
  font-size: 11px;
  color: var(--bad);
}

.notice {
  margin: 0;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-muted);
}

.notice.is-error {
  background: color-mix(in srgb, var(--bad) 14%, transparent);
  color: var(--bad);
}

.stats {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
}

.stats__row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  font-size: 12px;
}

.stats__row dt {
  color: var(--text-faint);
}

.stats__row dd {
  margin: 0;
  font-family: var(--mono);
  color: var(--text-muted);
}

/* ------------------------------------------------------------------ tabs */
.tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
}

.tabs__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-muted);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition:
    border-color 0.12s,
    background 0.12s;
}

.tabs__item:hover {
  background: var(--surface-hover);
}

.tabs__item.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--text);
}

.tabs__label {
  font-size: 13px;
  font-weight: 600;
}

.tabs__hint {
  font-size: 11px;
  color: var(--text-faint);
}

/* --------------------------------------------------------------- preview */
.preview__head,
.export__title {
  padding: var(--space-4) var(--space-4) 0;
}

.preview__stage {
  display: grid;
  place-items: center;
  padding: var(--space-5);
  min-height: 340px;
}

.preview__art {
  width: min(420px, 100%);
  height: auto;
  border-radius: var(--radius-sm);
  background: #fff;
}

.preview__art--raster {
  image-rendering: pixelated;
}

.preview__empty {
  color: var(--text-faint);
  font-size: 13px;
}

.preview.is-busy .preview__art {
  opacity: 0.72;
  transition: opacity 0.15s;
}

/* ----------------------------------------------------------------- score */
.score {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.score__head {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.score__meter {
  position: relative;
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  flex: 0 0 auto;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  background: var(--bg-sunken);
}

.score[data-verdict='excellent'] .score__meter {
  border-color: var(--good);
}
.score[data-verdict='good'] .score__meter {
  border-color: var(--accent);
}
.score[data-verdict='weak'] .score__meter {
  border-color: var(--warn);
}
.score[data-verdict='blocked'] .score__meter {
  border-color: var(--bad);
}

.score__value {
  font-size: 26px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.score__badge {
  position: absolute;
  bottom: -8px;
  padding: 1px 7px;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 10px;
  color: var(--text-faint);
}

.score__verdict {
  font-size: 15px;
  font-weight: 600;
  margin-top: 2px;
}

.score__summary {
  margin: 4px 0 0;
  font-size: 12px;
  color: var(--text-muted);
}

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

.bars__row {
  display: grid;
  grid-template-columns: 96px 1fr 36px;
  align-items: center;
  gap: var(--space-3);
  font-size: 12px;
}

.bars__label {
  color: var(--text-muted);
}

.bars__track {
  height: 6px;
  border-radius: 99px;
  background: var(--bg-sunken);
  overflow: hidden;
}

.bars__fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 99px;
  background: var(--good);
  transition: width 0.2s;
}

.bars__fill[data-level='part'] {
  background: var(--warn);
}
.bars__fill[data-level='low'] {
  background: var(--bad);
}

.bars__count {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--text-faint);
}

.failures,
.advice {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.failures__item {
  font-size: 12px;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
}

.failures__item::before {
  content: '×';
  position: absolute;
  left: 2px;
  color: var(--bad);
}

.failures__none {
  font-size: 12px;
  color: var(--good);
}

.advice__item {
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-muted);
}

.advice__dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--text-faint);
}

.advice__item--blocker .advice__dot {
  background: var(--bad);
}
.advice__item--warning .advice__dot {
  background: var(--warn);
}
.advice__item--hint .advice__dot {
  background: var(--accent);
}

/* ---------------------------------------------------------------- export */
.export {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
}

.export__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  padding: 0 var(--space-4);
}

.export__actions {
  display: flex;
  gap: var(--space-2);
  padding: 0 var(--space-4);
}

.export__actions .button {
  flex: 1;
}

/* ---------------------------------------------------------------- dialog */
.dialog {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--text);
  padding: 0;
  max-width: 520px;
  width: calc(100vw - 32px);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
}

.dialog::backdrop {
  background: rgba(4, 6, 10, 0.62);
}

.dialog__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-5);
}

.dialog__title {
  font-size: 17px;
}

.dialog__lede {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.dialog__section h3 {
  margin: 0 0 var(--space-2);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

.dialog__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-height: 46vh;
  overflow-y: auto;
}

.dialog__actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}