:root {
  color-scheme: light;
  --accent: #f16422;
  --accent-strong: #c7420c;
  --accent-soft: #fff0e7;
  --accent-ink: #351207;
  --background: #f8f3ed;
  --surface: #fffdf9;
  --surface-raised: #ffffff;
  --surface-muted: #f1eae2;
  --editor-background: #24201d;
  --editor-ink: #fff7f0;
  --editor-gutter: #9e8e82;
  --syntax-html-tag: #ff9d72;
  --syntax-html-attribute: #ffd18e;
  --syntax-helper: #d1b3ff;
  --syntax-variable: #8ed3ff;
  --syntax-string: #b7e39b;
  --syntax-comment: #b9a79b;
  --syntax-keyword: #ffb86c;
  --syntax-delimiter: #ff7b3d;
  --ink: #241d19;
  --ink-strong: #15110f;
  --muted: #6e625a;
  --border: #d8cbc0;
  --border-strong: #bcaea2;
  --success: #24734c;
  --success-soft: #e5f4eb;
  --danger: #b93832;
  --danger-soft: #fbe9e7;
  --warning: #956400;
  --warning-soft: #fff2cc;
  --shadow: 0 18px 50px rgb(78 45 26 / 10%);
  --radius-small: 6px;
  --radius: 10px;
  --font-sans: "Avenir Next", Avenir, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-display: ui-rounded, "SF Pro Rounded", "Avenir Next", Avenir, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --accent: #f16422;
  --accent-strong: #ff8249;
  --accent-soft: #3a2118;
  --accent-ink: #ffe7da;
  --background: #14110f;
  --surface: #1d1916;
  --surface-raised: #241f1b;
  --surface-muted: #2a241f;
  --editor-background: #100e0d;
  --editor-ink: #f8eee7;
  --editor-gutter: #87776c;
  --syntax-html-tag: #ffad86;
  --syntax-html-attribute: #ffdc9e;
  --syntax-helper: #d7bdff;
  --syntax-variable: #9edcff;
  --syntax-string: #c2eaa9;
  --syntax-comment: #a99990;
  --syntax-keyword: #ffc27a;
  --syntax-delimiter: #ff8249;
  --ink: #eee5df;
  --ink-strong: #fffaf6;
  --muted: #b7a89e;
  --border: #78685e;
  --border-strong: #806d62;
  --success: #65d09a;
  --success-soft: #173328;
  --danger: #ff8a82;
  --danger-soft: #3e211f;
  --warning: #f2c76d;
  --warning-soft: #3d321b;
  --shadow: 0 22px 60px rgb(0 0 0 / 28%);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--background);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent 0 49.9%, color-mix(in srgb, var(--accent) 5%, transparent) 50%, transparent 50.1%) 0 0 / 40px 40px,
    var(--background);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  transition: background-color 160ms ease, color 160ms ease;
}

button,
select,
textarea {
  font: inherit;
}

button,
select,
a {
  -webkit-tap-highlight-color: transparent;
}

button,
select {
  min-height: 44px;
}

button {
  color: inherit;
}

a {
  color: inherit;
}

button:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 58%, transparent);
  outline-offset: 3px;
}

.site-header {
  position: relative;
  z-index: 10;
  min-height: 68px;
  border-bottom: 1px solid var(--border);
  background: var(--background);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1312px, 100%);
  min-height: 68px;
  margin: 0 auto;
  padding: 10px clamp(20px, 4vw, 32px);
}

.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand:hover {
  opacity: 0.78;
}

.brand-logo {
  display: block;
  width: 200px;
  height: auto;
}

.brand-logo-dark {
  display: none;
}

:root[data-theme="dark"] .brand-logo-light {
  display: none;
}

:root[data-theme="dark"] .brand-logo-dark {
  display: block;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-actions > a {
  padding: 8px 10px;
  border-radius: var(--radius-small);
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.header-actions > a:hover {
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-small);
  background: var(--surface);
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.theme-toggle-mark {
  width: 13px;
  height: 13px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  box-shadow: inset 6px 0 0 var(--accent);
}

:root[data-theme="dark"] .theme-toggle-mark {
  box-shadow: none;
  background: var(--accent);
}

main {
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: clamp(28px, 3.5vw, 48px) clamp(16px, 4vw, 64px) 42px;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.55fr);
  gap: clamp(28px, 7vw, 96px);
  align-items: end;
  max-width: 1312px;
  margin: 0 auto clamp(22px, 3vw, 32px);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 14px;
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1 {
  max-width: 760px;
  margin: 0;
  color: var(--ink-strong);
  font-family: var(--font-display);
  font-size: clamp(36px, 4vw, 54px);
  font-weight: 700;
  letter-spacing: -0.052em;
  line-height: 1.08;
}

.intro-copy {
  max-width: 410px;
  margin: 0 0 5px;
  color: var(--muted);
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.65;
}

.playground {
  overflow: hidden;
  max-width: 1312px;
  margin: 0 auto;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(170px, 220px) auto;
  gap: 12px;
  align-items: end;
  justify-content: start;
  min-height: 80px;
  padding: 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-muted);
}

.control {
  display: grid;
  gap: 5px;
}

.control > span {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

select,
.secondary-button {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-small);
  background: var(--surface-raised);
}

select {
  width: 100%;
  padding: 0 38px 0 12px;
  color: var(--ink-strong);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13px;
}

.secondary-button {
  padding: 0 15px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
}

.secondary-button:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(440px, 1fr);
  align-items: stretch;
  min-height: 548px;
}

.panel {
  min-width: 0;
  background: var(--surface);
}

.editor-panel {
  display: grid;
  grid-template-rows: 64px 240px auto;
  border-right: 1px solid var(--border);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  min-height: 0;
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-raised);
}

.panel-kicker {
  margin: 0 0 3px;
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.panel-header h2 {
  margin: 0;
  color: var(--ink-strong);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

.live-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.live-label > span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
}

.editor-shell {
  position: relative;
  min-height: 240px;
  overflow: hidden;
  background: var(--editor-background);
}

#source-editor,
#source-editor .cm-editor {
  height: 240px;
  min-width: 0;
}

#source-editor .cm-editor {
  color: var(--editor-ink);
  background: var(--editor-background);
  font-family: var(--font-mono);
  font-size: 14px;
  font-variant-ligatures: none;
  line-height: 1.72;
}

#source-editor .cm-scroller {
  overflow: auto;
  font-family: inherit;
}

#source-editor .cm-content {
  min-width: max-content;
  padding: 20px 0;
  caret-color: var(--accent);
  tab-size: 2;
}

#source-editor .cm-line {
  padding: 0 22px;
}

#source-editor .cm-gutters {
  border-right: 1px solid color-mix(in srgb, var(--editor-gutter) 24%, transparent);
  color: var(--editor-gutter);
  background: color-mix(in srgb, var(--editor-background) 92%, #000000);
}

#source-editor .cm-activeLine,
#source-editor .cm-activeLineGutter {
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

#source-editor .cm-cursor {
  border-left-color: var(--accent);
}

#source-editor .cm-selectionBackground,
#source-editor .cm-content ::selection,
.config-editor::selection {
  color: #fff;
  background: color-mix(in srgb, var(--accent) 52%, #000) !important;
}

#source-editor .cm-focused {
  outline: 3px solid color-mix(in srgb, var(--accent) 58%, transparent);
  outline-offset: -3px;
}

.problems-section {
  padding: 16px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.problems-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.problems-header h3 {
  margin: 0;
  color: var(--ink-strong);
  font-family: var(--font-display);
  font-size: 16px;
}

.configuration-panel {
  display: grid;
  grid-template-rows: 64px minmax(0, 1fr);
  min-height: 548px;
}

.summary {
  display: flex;
  gap: 6px;
}

.summary-pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 2px 9px 0;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
}

.summary-pill.errors {
  color: var(--danger);
  background: var(--danger-soft);
}

.summary-pill.warnings {
  color: var(--warning);
  background: var(--warning-soft);
}

.summary-pill.clean {
  color: var(--success);
  background: var(--success-soft);
}

.diagnostics-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 9px;
}

.diagnostic {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-small);
  background: var(--surface-raised);
  cursor: pointer;
  text-align: left;
}

.diagnostic:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.diagnostic:only-child {
  grid-column: 1 / -1;
}

.diagnostic-topline {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 7px;
}

.severity-mark {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--danger);
}

.diagnostic.warning .severity-mark {
  background: var(--warning);
}

.rule-name {
  min-width: 0;
  overflow: hidden;
  color: var(--ink-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 750;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.location {
  margin-left: auto;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  white-space: nowrap;
}

.diagnostic-message {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.empty-state {
  display: grid;
  grid-column: 1 / -1;
  place-items: center;
  min-height: 290px;
  padding: 36px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-small);
  text-align: center;
}

.compact-empty-state {
  min-height: 164px;
  padding: 24px;
}

.compact-empty-state .empty-state-mark {
  width: 34px;
  height: 34px;
  margin-bottom: 8px;
  font-size: 16px;
}

.empty-state-mark {
  display: grid;
  width: 42px;
  height: 42px;
  margin: 0 auto 12px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--success) 38%, transparent);
  border-radius: 50%;
  color: var(--success);
  background: var(--success-soft);
  font-size: 20px;
  font-weight: 800;
}

.error-state-mark {
  border-color: color-mix(in srgb, var(--danger) 38%, transparent);
  color: var(--danger);
  background: var(--danger-soft);
}

.empty-state h3 {
  margin: 0 0 5px;
  color: var(--ink-strong);
  font-family: var(--font-display);
  font-size: 18px;
}

.empty-state p {
  max-width: 280px;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.configuration-body {
  display: grid;
  gap: 18px;
  align-content: start;
  padding: 16px 16px 16px;
}

.configuration-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(210px, 0.9fr);
  gap: 14px;
}

.configuration-section {
  min-width: 0;
}

.section-heading {
  margin-bottom: 10px;
}

.section-heading h3 {
  margin: 0 0 3px;
  color: var(--ink-strong);
  font-family: var(--font-display);
  font-size: 15px;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.config-validity {
  flex: 0 0 auto;
  padding: 4px 7px;
  border-radius: 999px;
  color: var(--success);
  background: var(--success-soft);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
}

.config-validity.is-invalid {
  color: var(--danger);
  background: var(--danger-soft);
}

.config-editor {
  width: 100%;
  min-height: 210px;
  resize: vertical;
  padding: 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-small);
  color: var(--editor-ink);
  background: var(--editor-background);
  caret-color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  tab-size: 2;
}

.available-rules {
  display: grid;
  gap: 7px;
  max-height: 210px;
  overflow: auto;
  padding-right: 3px;
}

.available-rule {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  min-height: 54px;
  padding: 8px 9px;
  border: 1px solid var(--border);
  border-radius: var(--radius-small);
  color: var(--ink);
  background: var(--surface-raised);
  cursor: pointer;
  text-align: left;
}

.available-rule:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.available-rule-content {
  display: grid;
  min-width: 0;
  gap: 2px;
}

.available-rule code {
  overflow: hidden;
  color: var(--ink-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 750;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.available-rule-content > span {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.35;
}

.available-rule-action {
  display: grid;
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  margin-left: auto;
  place-items: center;
  border-radius: 50%;
  color: var(--accent-ink);
  background: var(--accent);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 800;
  line-height: 1;
  padding-top: 1px;
}

.available-rule.is-added .available-rule-action {
  color: var(--success);
  background: var(--success-soft);
}

.resolved-config {
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.resolved-config-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.copy-button {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding: 0 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-small);
  color: var(--muted);
  background: var(--surface-raised);
  cursor: pointer;
  font-size: 11px;
  font-weight: 700;
}

.copy-button:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.copy-button.is-copied {
  border-color: var(--success);
  color: var(--success);
  background: var(--success-soft);
}

.copy-button svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.resolved-config pre {
  max-height: 145px;
  overflow: auto;
  margin: 0;
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius-small);
  color: var(--muted);
  background: var(--surface-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.55;
  white-space: pre-wrap;
}

.privacy-note {
  display: flex;
  gap: 13px;
  align-items: center;
  max-width: 1312px;
  margin: 20px auto 0;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-small);
  background: color-mix(in srgb, var(--surface) 78%, transparent);
}

.privacy-mark {
  display: grid;
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 50%;
  color: var(--accent-ink);
  background: var(--accent);
  font-weight: 900;
  line-height: 1;
  padding-top: 1px;
}

.privacy-note strong {
  color: var(--ink-strong);
  font-size: 13px;
}

.privacy-note p {
  margin: 1px 0 0;
  color: var(--muted);
  font-size: 12px;
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1312px, calc(100% - 32px));
  min-height: 76px;
  margin: 0 auto;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

footer a:hover {
  color: var(--accent-strong);
}

@media (max-width: 900px) {
  .intro {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .intro-copy {
    max-width: 640px;
  }

  .toolbar {
    grid-template-columns: minmax(0, 1fr) minmax(150px, 0.55fr) auto;
  }


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

  .editor-panel {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .configuration-panel {
    min-height: 0;
  }
}

@media (max-width: 640px) {
  .site-header-inner {
    padding: 9px 16px;
  }

  .header-actions > a {
    display: none;
  }

  .brand-logo {
    width: 168px;
  }

  .theme-toggle {
    padding: 0 10px;
  }

  main {
    padding-top: 20px;
  }

  .intro {
    gap: 10px;
    margin-bottom: 18px;
  }

  .eyebrow {
    margin-bottom: 9px;
    font-size: 10px;
  }

  h1 {
    font-size: clamp(32px, 9vw, 38px);
    line-height: 1.06;
  }

  .intro-copy {
    font-size: 14px;
    line-height: 1.5;
  }

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

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

  .secondary-button {
    align-self: end;
  }

  .workspace {
    min-height: 0;
  }

  .editor-panel {
    grid-template-rows: 65px 360px auto;
  }

  .panel-header {
    height: 65px;
    padding: 11px 14px;
  }

  .configuration-panel {
    grid-template-rows: 65px minmax(0, 1fr);
  }

  .editor-shell {
    min-height: 360px;
  }

  #source-editor,
  #source-editor .cm-editor {
    height: 360px;
  }

  #source-editor .cm-editor {
    font-size: 12px;
  }

  #source-editor .cm-line {
    padding: 0 14px;
  }

  .configuration-panel {
    min-height: 0;
  }

  .problems-section,
  .configuration-body {
    padding: 14px;
  }

  .diagnostics-list,
  .configuration-grid {
    grid-template-columns: 1fr;
  }

  .available-rules {
    max-height: none;
    overflow: visible;
    padding-right: 0;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 3px;
  }
}

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