@font-face {
  font-family: "Helvetica Neue Formula";
  src: url("../assets/fonts/HelveticaNeueLTStd-Roman.woff")
    format("woff");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Helvetica Neue Formula";
  src: url("../assets/fonts/HelveticaNeueLTStd-Md.woff")
    format("woff");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Helvetica Neue Formula";
  src: url("../assets/fonts/HelveticaNeueLTStd-Bd.woff")
    format("woff");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Oxanium Formula";
  src: url("../assets/fonts/Oxanium-500.woff")
    format("woff");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --surface-soft: #fdfdff;
  --ink: #1d1d1f;
  --muted: #66717f;
  --line: rgba(28, 32, 38, 0.1);
  --accent: #4a2476;
  --accent-strong: #331552;
  --teal: #147a7e;
  --rose: #b6416d;
  --gold: #a76500;
  --blue: #0a69c7;
  --danger: #9f2d20;
  --ok: #237044;
  --panel: #eef1f6;
  --button-gradient: linear-gradient(135deg, #000 0%, #17101f 48%, #4a2476 100%);
  --button-gradient-hover: linear-gradient(135deg, #000 0%, #1f142b 44%, #5a2c8d 100%);
  --button-hover-wash: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(125, 74, 184, 0.18) 46%,
    rgba(133, 82, 198, 0.62) 100%
  );
  --shadow: 0 28px 90px rgba(35, 42, 54, 0.13);
  --shadow-soft: 0 12px 36px rgba(35, 42, 54, 0.08);
}

* {
  box-sizing: border-box;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  background: linear-gradient(180deg, #f7f8fb 0%, #ffffff 48%, #f3f6fb 100%);
  color: var(--ink);
  font-family:
    "Helvetica Neue Formula",
    "Helvetica Neue",
    Helvetica,
    Arial,
    sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  right: 0;
  height: 108px;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(248, 249, 252, 1) 0%,
    rgba(248, 249, 252, 1) 70%,
    rgba(247, 248, 251, 0) 100%
  );
}

button,
select,
textarea {
  font: inherit;
}

button {
  letter-spacing: 0;
}

a {
  color: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

.topbar,
.app-shell,
.footer {
  margin: 0 auto;
}

.topbar {
  width: min(1180px, calc(100% - 32px));
  position: sticky;
  z-index: 3;
  top: 12px;
  min-height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border: 1px solid rgba(28, 32, 38, 0.06);
  border-radius: 8px;
  padding: 10px 22px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 20px 58px rgba(35, 42, 54, 0.11);
  backdrop-filter: saturate(170%) blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-size: 1rem;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  display: inline-block;
  border-radius: 7px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.65), transparent 38%),
    conic-gradient(from 30deg, #141414, #72757d, #0f1012, #b7bac2, #2c2d31);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.16);
  transform: rotate(45deg) scale(0.78);
}

.topbar nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 0.92rem;
}

.topbar nav a,
.topbar nav button {
  border: 0;
  padding: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
  text-decoration: none;
  transition: color 160ms ease;
}

.topbar nav a:hover,
.topbar nav a:focus-visible,
.topbar nav button:hover,
.topbar nav button:focus-visible {
  color: var(--accent-strong);
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  position: relative;
  z-index: 2;
  padding: 48px 0 28px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 820px;
  margin-bottom: 18px;
  font-size: 3rem;
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: 1.38rem;
  line-height: 1.14;
  letter-spacing: 0;
}

h3 {
  font-size: 0.9rem;
  line-height: 1.2;
  letter-spacing: 0;
}

.editor-panel,
.preview-panel {
  border: 1px solid rgba(28, 32, 38, 0.08);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-soft);
}

.panel-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
}

.palette-toolbar,
.palette-menu,
.palette-trigger {
  --category-color: var(--accent);
}

.palette-toolbar [data-tone="teal"],
.palette-menu[data-tone="teal"],
.palette-trigger[data-tone="teal"] {
  --category-color: var(--teal);
}

.palette-toolbar [data-tone="rose"],
.palette-menu[data-tone="rose"],
.palette-trigger[data-tone="rose"] {
  --category-color: var(--rose);
}

.palette-toolbar [data-tone="gold"],
.palette-menu[data-tone="gold"],
.palette-trigger[data-tone="gold"] {
  --category-color: var(--gold);
}

.palette-toolbar [data-tone="blue"],
.palette-menu[data-tone="blue"],
.palette-trigger[data-tone="blue"] {
  --category-color: var(--blue);
}

.palette-toolbar [data-tone="ink"],
.palette-menu[data-tone="ink"],
.palette-trigger[data-tone="ink"] {
  --category-color: #252a31;
}

.palette-toolbar {
  position: relative;
  z-index: 4;
  margin: 0 0 14px;
}

.palette-trigger-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.palette-trigger {
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 5px 11px 2px;
  background: rgba(255, 255, 255, 0.84);
  color: var(--category-color);
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 850;
  line-height: 1;
  transition:
    border-color 160ms ease,
    background 160ms ease,
    box-shadow 160ms ease,
    color 160ms ease;
}

.palette-trigger:hover,
.palette-trigger:focus-visible,
.palette-trigger[aria-expanded="true"] {
  border-color: color-mix(in srgb, var(--category-color) 38%, white);
  background: color-mix(in srgb, var(--category-color) 9%, white);
  box-shadow: 0 8px 20px rgba(35, 42, 54, 0.08);
}

.palette-trigger[aria-expanded="true"] {
  color: var(--ink);
}

.palette-menu {
  position: absolute;
  z-index: 8;
  top: calc(100% + 10px);
  right: 0;
  left: 0;
  max-height: min(360px, 64vh);
  overflow: auto;
  border: 1px solid color-mix(in srgb, var(--category-color) 18%, var(--line));
  border-radius: 8px;
  padding: 14px;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.98),
    color-mix(in srgb, var(--category-color) 5%, #fff)
  );
  box-shadow: 0 28px 70px rgba(35, 42, 54, 0.18);
  backdrop-filter: saturate(170%) blur(18px);
}

.palette-menu-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.palette-menu-head h3 {
  margin: 0;
  color: var(--category-color);
  font-weight: 850;
}

.palette-menu-head span {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
}

.text-size-tool {
  display: grid;
  grid-template-columns: auto minmax(86px, 120px) auto;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  border: 1px solid color-mix(in srgb, var(--category-color) 16%, var(--line));
  border-radius: 8px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.74);
}

.text-size-tool label,
.matrix-builder label {
  color: var(--category-color);
  font-size: 0.78rem;
  font-weight: 850;
}

.text-size-tool select,
.matrix-builder input,
.output-controls select {
  min-height: 38px;
  border: 1px solid rgba(28, 32, 38, 0.12);
  border-radius: 8px;
  padding: 5px 34px 2px 10px;
  background: #fff;
  color: var(--ink);
  font-weight: 760;
}

.text-size-button {
  min-height: 38px;
  box-shadow: none;
}

.matrix-builder {
  display: grid;
  gap: 10px;
  margin-bottom: 12px;
  border: 1px solid color-mix(in srgb, var(--category-color) 16%, var(--line));
  border-radius: 8px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.76);
}

.matrix-builder.is-locked {
  border-color: color-mix(in srgb, var(--category-color) 34%, var(--line));
  background: color-mix(in srgb, var(--category-color) 6%, #fff);
}

.matrix-builder-header,
.matrix-builder-body {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.matrix-builder-header strong {
  color: var(--category-color);
  font-size: 0.82rem;
  line-height: 1.2;
}

.matrix-builder-header span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
}

.matrix-lock-label {
  min-height: 24px;
  display: inline-flex;
  align-items: center;
  border: 1px solid color-mix(in srgb, var(--category-color) 20%, var(--line));
  border-radius: 999px;
  padding: 4px 8px 1px;
  background: #fff;
  color: var(--category-color) !important;
  line-height: 1;
}

.matrix-builder:not(.is-locked) .matrix-lock-label {
  color: var(--muted) !important;
}

.matrix-type-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.matrix-type-button {
  min-height: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 5px 9px 2px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 850;
  line-height: 1;
}

.matrix-type-button:hover,
.matrix-type-button:focus-visible,
.matrix-type-button.is-active {
  border-color: color-mix(in srgb, var(--category-color) 40%, white);
  background: color-mix(in srgb, var(--category-color) 9%, white);
  color: var(--category-color);
}

.matrix-size-grid {
  display: grid;
  grid-template-columns: repeat(8, 18px);
  gap: 5px;
  padding: 2px;
}

.matrix-size-cell {
  width: 18px;
  height: 12px;
  border: 0;
  border-radius: 3px;
  background: rgba(28, 32, 38, 0.08);
  cursor: pointer;
  transition:
    background 120ms ease,
    transform 120ms ease;
}

.matrix-size-cell:hover,
.matrix-size-cell:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--category-color) 34%, white);
  outline-offset: 1px;
}

.matrix-size-cell.is-selected {
  background: color-mix(in srgb, var(--category-color) 24%, #fff);
}

.matrix-size-cell.is-locked {
  background: color-mix(in srgb, var(--category-color) 86%, #152033);
  transform: translateY(-1px);
}

.matrix-size-cell.is-anchor {
  outline: 2px solid color-mix(in srgb, var(--category-color) 38%, white);
  outline-offset: 1px;
}

.matrix-size-cell.is-anchor.is-locked {
  outline-color: color-mix(in srgb, var(--category-color) 72%, #152033);
}

.matrix-builder-fields {
  min-width: min(190px, 100%);
  display: grid;
  grid-template-columns: minmax(70px, auto) minmax(64px, 1fr);
  align-items: center;
  gap: 8px;
}

.matrix-builder input {
  width: 100%;
  padding-right: 8px;
}

.matrix-insert-button {
  grid-column: 1 / -1;
  min-height: 38px;
}

.symbol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 8px;
}

.symbol-button {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(247, 249, 252, 0.94));
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transition:
    border-color 160ms ease,
    background 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.symbol-button {
  min-height: 86px;
  display: grid;
  align-content: center;
  gap: 8px;
  padding: 12px;
}

.symbol-button:hover,
.symbol-button:focus-visible {
  border-color: color-mix(in srgb, var(--category-color, var(--accent)) 45%, white);
  background: linear-gradient(135deg, #fff 0%, #fbf8ff 100%);
  box-shadow: 0 14px 30px rgba(35, 42, 54, 0.08);
  transform: translateY(-1px);
}

.symbol-button-label {
  color: var(--category-color);
  font-size: 0.76rem;
  font-weight: 800;
}

.symbol-button-body {
  min-width: 0;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
}

.symbol-visual {
  min-width: 0;
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--category-color) 14%, var(--line));
  border-radius: 7px;
  padding: 4px;
  background: color-mix(in srgb, var(--category-color) 5%, #fff);
  color: var(--category-color);
  font-size: 1rem;
}

.symbol-visual mjx-container {
  max-width: 100%;
  margin: 0 !important;
  overflow: hidden;
}

.symbol-visual svg {
  max-width: 100%;
  max-height: 34px;
}

.symbol-visual.is-failed {
  color: var(--muted);
}

code {
  font-family:
    "Oxanium Formula",
    "SFMono-Regular",
    Consolas,
    "Liberation Mono",
    monospace;
}

.symbol-button code {
  min-width: 0;
  overflow-wrap: anywhere;
  color: #30333a;
  font-size: 0.78rem;
  line-height: 1.25;
  white-space: normal;
}

.workbench-shell {
  margin-bottom: 18px;
}

.workbench-shell > [data-panel],
#rendered-panel-slot,
#editor-panel-slot,
.preview-panel,
.editor-panel,
.both-panel-shell,
.both-palette-slot,
.both-layout,
.palette-trigger-row {
  width: 100%;
}

.workbench-tabs {
  width: min(720px, 100%);
  max-width: 100%;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  margin-bottom: 30px;
  border: 1px solid rgba(28, 32, 38, 0.08);
  border-radius: 8px;
  padding: 8px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(246, 241, 251, 0.84));
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.82) inset,
    0 18px 44px rgba(35, 42, 54, 0.08);
}

.workbench-tab {
  min-height: 48px;
  border: 1px solid transparent;
  border-radius: 7px;
  padding: 7px 16px 3px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.98rem;
  font-weight: 850;
  line-height: 1;
  transition:
    border-color 160ms ease,
    background 160ms ease,
    box-shadow 160ms ease,
    color 160ms ease;
}

.workbench-tab:hover,
.workbench-tab:focus-visible {
  color: var(--ink);
  background: rgba(74, 36, 118, 0.06);
}

.workbench-tab[aria-selected="true"] {
  border-color: rgba(5, 6, 7, 0.88);
  background: var(--button-gradient);
  color: #fff;
  box-shadow: 0 12px 26px rgba(8, 10, 14, 0.16);
}

.workbench-shell > .action-grid {
  grid-template-columns: repeat(auto-fit, minmax(134px, 1fr));
  margin: 10px 0 0;
}

.both-panel-shell {
  border: 1px solid rgba(28, 32, 38, 0.08);
  border-radius: 8px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-soft);
}

.both-palette-slot {
  min-width: 0;
}

.both-panel-shell .palette-toolbar {
  margin-bottom: 14px;
}

.both-layout {
  --both-column-height: 500px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 0.92fr);
  align-items: stretch;
  gap: 14px;
}

.both-column {
  min-width: 0;
  display: grid;
}

.both-panel-shell .preview-panel,
.both-panel-shell .editor-panel {
  min-height: 0;
  height: var(--both-column-height);
  display: flex;
  flex-direction: column;
  border: 0;
  border-radius: 0;
  padding: 0;
  background: transparent;
  box-shadow: none;
}

.both-panel-shell .editor-title-row {
  display: none;
}

.both-panel-shell .preview-status-row {
  min-height: 0;
  margin-bottom: 8px;
}

.both-layout .preview-canvas {
  min-height: 0;
  flex: 1;
}

.both-panel-shell .latex-editor {
  min-height: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.both-layout .latex-editor textarea {
  min-height: 0;
  height: auto;
  flex: 1;
}

.editor-panel,
.preview-panel {
  padding: 24px;
}

.preview-panel {
  position: relative;
}

.preview-status-row {
  display: none;
}

.editor-title-row {
  margin-bottom: 14px;
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.section-heading label,
.section-heading h3 {
  margin: 0;
  color: var(--ink);
  font-weight: 800;
}

.section-heading span,
.editor-meta {
  color: var(--muted);
  font-size: 0.78rem;
}

.latex-editor textarea {
  width: 100%;
  min-height: 500px;
  border: 1px solid rgba(74, 36, 118, 0.18);
  border-radius: 8px;
  padding: 18px;
  resize: vertical;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(251, 248, 255, 0.9));
  color: var(--ink);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.9) inset;
  font-family:
    "Oxanium Formula",
    "SFMono-Regular",
    Consolas,
    "Liberation Mono",
    monospace;
  font-size: 0.98rem;
  line-height: 1.55;
  outline: none;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

.latex-editor textarea:focus {
  border-color: rgba(74, 36, 118, 0.54);
  background: #fff;
  box-shadow:
    0 0 0 4px rgba(74, 36, 118, 0.08),
    0 18px 42px rgba(35, 42, 54, 0.08);
}

.editor-meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 8px;
}

.action-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin: 14px 0;
}

.output-panel {
  margin-top: 15px;
  border: 1px solid rgba(28, 32, 38, 0.08);
  border-radius: 8px;
  padding: 16px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(247, 249, 252, 0.94));
  box-shadow: var(--shadow-soft);
}

.output-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 8px;
}

.output-controls {
  display: grid;
  grid-template-columns: auto minmax(170px, 220px) auto;
  align-items: center;
  gap: 9px;
}

.output-controls label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.output-copy {
  min-height: 38px;
  white-space: nowrap;
}

.formatted-output {
  width: 100%;
  min-height: clamp(74px, 8vh, 104px);
  border: 1px solid rgba(74, 36, 118, 0.16);
  border-radius: 8px;
  padding: 14px;
  resize: vertical;
  background: #fff;
  color: var(--ink);
  font-family:
    "Oxanium Formula",
    "SFMono-Regular",
    Consolas,
    "Liberation Mono",
    monospace;
  font-size: 0.88rem;
  line-height: 1.45;
  outline: none;
}

.formatted-output:focus {
  border-color: rgba(74, 36, 118, 0.42);
  box-shadow: 0 0 0 4px rgba(74, 36, 118, 0.08);
}

.output-hint {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.35;
}

.footer {
  width: min(1180px, calc(100% - 32px));
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
  padding: 18px 0 42px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.footer a {
  color: var(--muted);
  cursor: pointer;
  text-decoration: none;
  transition: color 160ms ease;
}

.footer a:hover,
.footer a:focus-visible {
  color: var(--ink);
}

.footer-narra-anchor {
  position: relative;
  z-index: 0;
  display: inline-block;
  color: var(--muted);
  outline-offset: 4px;
  transition:
    color 180ms ease,
    text-shadow 180ms ease;
}

.footer-narra-anchor::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -5px -8px -4px;
  border-radius: 999px;
  background:
    radial-gradient(circle at 28% 50%, rgba(10, 105, 199, 0.24), transparent 58%),
    radial-gradient(circle at 70% 50%, rgba(182, 65, 109, 0.2), transparent 62%);
  opacity: 0;
  filter: blur(8px);
  pointer-events: none;
}

.footer-narra-anchor:hover,
.footer-narra-anchor:focus-visible {
  color: var(--ink);
  text-shadow:
    0 0 10px rgba(10, 105, 199, 0.22),
    0 0 18px rgba(182, 65, 109, 0.18);
}

.footer-narra-anchor:hover::after,
.footer-narra-anchor:focus-visible::after {
  animation: footer-link-glow 1.8s ease-in-out infinite;
}

@keyframes footer-link-glow {
  0%,
  100% {
    opacity: 0.36;
    filter: blur(8px);
  }

  50% {
    opacity: 0.9;
    filter: blur(12px);
  }
}

.button {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(5, 6, 7, 0.88);
  border-radius: 8px;
  padding: 4px 14px 0;
  background: var(--button-gradient);
  color: #fff;
  cursor: pointer;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  box-shadow: 0 14px 32px rgba(8, 10, 14, 0.18);
  transition:
    border-color 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

.button::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  border-radius: inherit;
  background: var(--button-hover-wash);
  opacity: 0;
  transition: opacity 240ms ease;
}

.button:hover,
.button:focus-visible {
  background: var(--button-gradient-hover);
  box-shadow: 0 18px 40px rgba(8, 10, 14, 0.24);
}

.button:hover::before,
.button:focus-visible::before {
  opacity: 1;
}

.button.secondary {
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
  box-shadow: none;
}

.button.secondary::before {
  background: rgba(74, 36, 118, 0.08);
}

.button.secondary:hover,
.button.secondary:focus-visible {
  border-color: rgba(74, 36, 118, 0.28);
  background: #fbf8ff;
  box-shadow: 0 12px 26px rgba(35, 42, 54, 0.08);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
  box-shadow: none;
}

.message {
  margin: 14px 0 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  background: #f7f9fc;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

.message strong {
  color: inherit;
}

.message-error {
  border-color: rgba(159, 45, 32, 0.2);
  background: linear-gradient(135deg, #fff 0%, #fff3f1 100%);
  color: var(--danger);
}

.message-success {
  border-color: rgba(35, 112, 68, 0.18);
  background: linear-gradient(135deg, #fff 0%, #eef9f2 100%);
  color: var(--ok);
}

.message-neutral {
  color: var(--muted);
}

.status-pill {
  min-height: 30px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 10px 2px;
  background: rgba(255, 255, 255, 0.8);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 900;
  text-transform: uppercase;
}

.status-ready {
  border-color: rgba(35, 112, 68, 0.16);
  color: var(--ok);
}

.status-error {
  border-color: rgba(159, 45, 32, 0.2);
  color: var(--danger);
}

.preview-canvas {
  position: relative;
  min-height: 320px;
  display: grid;
  place-items: center;
  overflow: auto;
  border: 1px solid rgba(28, 32, 38, 0.08);
  border-radius: 8px;
  padding: 34px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 1), rgba(247, 249, 252, 0.96)),
    #fff;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.92);
}

.preview-placeholder {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
}

.rendering-badge {
  position: absolute;
  right: 14px;
  bottom: 14px;
  min-height: 28px;
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 4px 10px 1px;
  background: rgba(74, 36, 118, 0.08);
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 800;
}

.rendered-formula {
  max-width: 100%;
}

.rendered-formula mjx-container {
  max-width: 100%;
  margin: 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.rendered-formula svg {
  max-width: 100%;
  height: auto;
}

mjx-assistive-mml {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
  clip: rect(1px, 1px, 1px, 1px) !important;
  white-space: nowrap !important;
}

.rendered-formula-display mjx-container {
  font-size: 1.5rem;
}

@media (max-width: 980px) {
  .workbench-shell > .action-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding: 14px 16px;
  }

  .topbar nav {
    width: 100%;
    justify-content: space-between;
    gap: 12px;
    font-size: 0.86rem;
  }

  .app-shell {
    padding-top: 38px;
  }

  h1 {
    font-size: 2.28rem;
    line-height: 1.02;
  }

  .action-grid,
  .workbench-shell > .action-grid {
    grid-template-columns: 1fr;
  }

  .editor-panel,
  .preview-panel,
  .both-panel-shell {
    padding: 18px;
  }

  .palette-menu {
    padding: 12px;
  }

  .text-size-tool {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .matrix-builder-body {
    flex-direction: column;
  }

  .matrix-builder-fields {
    width: 100%;
  }

  .workbench-tabs {
    width: 100%;
    grid-template-columns: 1fr;
  }

  .both-layout {
    grid-template-columns: 1fr;
  }

  .symbol-grid {
    grid-template-columns: repeat(auto-fill, minmax(132px, 1fr));
  }

  .latex-editor textarea {
    min-height: 220px;
    font-size: 0.92rem;
  }

  .preview-canvas {
    min-height: 240px;
    padding: 22px;
  }

  .output-header {
    align-items: stretch;
    flex-direction: column;
  }

  .output-controls {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .rendered-formula-display mjx-container {
    font-size: 1.14rem;
  }

  .footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    padding-bottom: 34px;
  }
}

@media (max-width: 460px) {
  .topbar,
  .app-shell,
  .footer {
    width: min(100% - 20px, 1180px);
  }

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

  .panel-title-row {
    flex-direction: column;
  }

}