:root {
  color-scheme: dark;
  --background: #0d1011;
  --surface: #151a1d;
  --surface-strong: #1b2226;
  --text: #f4f7f9;
  --muted: #a9b7c3;
  --subtle: #7f8e9a;
  --line: #2c363b;
  --accent: #6fd3c0;
  --accent-strong: #9ee6d8;
  --shadow: 0 18px 60px rgb(0 0 0 / 28%);
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::selection {
  background: var(--accent);
  color: #07100e;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

input:not([type="radio"]):not([type="checkbox"]),
select {
  width: 100%;
  min-width: 0;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #101416;
  color: var(--text);
  padding: 10px 12px;
}

input:not([type="radio"]):not([type="checkbox"]):focus,
select:focus {
  border-color: rgb(111 211 192 / 72%);
  outline: 2px solid rgb(111 211 192 / 22%);
  outline-offset: 2px;
}

input[readonly] {
  border-color: rgb(111 211 192 / 58%);
  background: rgb(111 211 192 / 10%);
  color: var(--accent-strong);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 1px solid rgb(111 211 192 / 58%);
  border-radius: 8px;
  background: var(--accent);
  color: #07100e;
  padding: 10px 14px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.button:hover,
.button:focus-visible {
  background: var(--accent-strong);
  outline: none;
}

.container {
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 12px;
  z-index: 10;
  transform: translateY(-140%);
  border-radius: 6px;
  background: var(--accent);
  color: #07100e;
  padding: 8px 12px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  border-bottom: 1px solid rgb(255 255 255 / 8%);
  background: rgb(13 16 17 / 88%);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--text);
  font-size: 1rem;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border: 1px solid rgb(111 211 192 / 48%);
  border-radius: 8px;
  background: rgb(111 211 192 / 12%);
  color: var(--accent-strong);
  font-size: 0.75rem;
  font-weight: 800;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  flex-wrap: wrap;
}

.site-nav a {
  border-radius: 6px;
  color: var(--muted);
  padding: 8px 10px;
  font-size: 0.94rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: rgb(255 255 255 / 7%);
  color: var(--text);
  outline: none;
}

.intro-section {
  padding: 40px 0 36px;
}

.intro-grid {
  max-width: 780px;
}

.intro-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.12;
}

h1 {
  max-width: 800px;
  font-size: 2.3rem;
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.16rem;
}

.intro-text {
  max-width: 660px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.06rem;
}

.empty-state,
.about-card,
.calculator-card,
.result-card,
.source-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.tools-section,
.about-section {
  padding: 48px 0;
}

.section-heading {
  display: grid;
  gap: 4px;
  max-width: 720px;
  margin-bottom: 22px;
}

.empty-state {
  padding: 24px;
}

.empty-state p,
.about-card p,
.source-card p {
  max-width: 680px;
  margin: 12px 0 0;
  color: var(--muted);
}

.about-card {
  display: grid;
  gap: 18px;
  padding: 24px;
}

.about-copy {
  display: grid;
  gap: 12px;
  max-width: 760px;
}

.about-copy p {
  margin: 0;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 16px;
}

.tool-card {
  display: grid;
  gap: 12px;
  min-height: 220px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 24px;
  text-decoration: none;
  box-shadow: var(--shadow);
}

.tool-card:hover,
.tool-card:focus-visible {
  border-color: rgb(111 211 192 / 54%);
  background: var(--surface-strong);
  outline: none;
}

.tool-card-label,
.tool-card-cta,
.preset-family,
.preset-count {
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 800;
}

.tool-card p {
  margin: 0;
  color: var(--muted);
}

.tool-card-cta {
  align-self: end;
}

.tool-intro {
  padding: 40px 0 24px;
}

.workspace-section {
  padding: 0 0 48px;
}

.bitrate-workspace {
  display: grid;
  gap: 20px;
}

.bitrate-workspace-main {
  display: grid;
}

.calculator-section {
  padding: 0 0 48px;
}

.bitrate-workspace > .calculator-section {
  padding: 0;
}

.calculator-layout {
  display: grid;
  gap: 20px;
}

.aspect-layout {
  align-items: start;
}

.calculator-card,
.result-card,
.source-card {
  padding: 20px;
}

.calculator-card {
  container-type: inline-size;
}

.calculator-heading {
  display: grid;
  gap: 4px;
}

.calculator-heading .eyebrow {
  margin-bottom: 12px;
}

.calculator-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 22px;
}

.secondary-button {
  border-color: var(--line);
  background: #101416;
  color: var(--muted);
}

.secondary-button:hover,
.secondary-button:focus-visible {
  border-color: rgb(111 211 192 / 54%);
  background: var(--surface-strong);
  color: var(--text);
}

.solve-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 24px 0;
  border: 0;
  padding: 0;
}

.solve-options legend {
  margin-bottom: 10px;
  color: var(--muted);
  font-weight: 800;
}

.solve-options label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #101416;
  color: var(--muted);
  padding: 10px;
  font-weight: 800;
}

.solve-options input {
  flex: 0 0 auto;
  accent-color: var(--accent);
}

.solve-options label:has(input:checked) {
  border-color: rgb(111 211 192 / 66%);
  background: rgb(111 211 192 / 12%);
  color: var(--text);
}

.aspect-solve-options {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.input-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.dimension-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.field-card {
  display: grid;
  align-content: start;
  gap: 8px;
  min-width: 0;
}

.field-card label,
.audio-row label,
.preset-controls label,
.ratio-controls label {
  color: var(--text);
  font-weight: 800;
}

.field-card p {
  margin: 0;
  color: var(--subtle);
  font-size: 0.9rem;
}

.field-card.is-solved label::after {
  content: " result";
  color: var(--accent-strong);
  font-size: 0.82rem;
}

.dimension-grid .field-card.is-input label::after {
  content: " input";
  color: var(--subtle);
  font-size: 0.82rem;
}

.compound-input {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(84px, max-content);
  gap: 8px;
}

.compact-input {
  max-width: 300px;
}

.audio-details {
  margin-top: 22px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.audio-details summary {
  color: var(--muted);
  cursor: pointer;
  font-weight: 800;
}

.audio-panel {
  display: grid;
  gap: 14px;
  margin-top: 14px;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 800;
}

.checkbox-row input {
  flex: 0 0 auto;
  accent-color: var(--accent);
}

.audio-row {
  display: grid;
  gap: 8px;
}

.audio-suggestions {
  margin: 0;
  color: var(--subtle);
  font-size: 0.9rem;
}

.audio-row:has(input:disabled) {
  opacity: 0.55;
}

@container (min-width: 660px) {
  .input-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .dimension-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.result-card {
  align-self: start;
}

.result-card h2 {
  margin-bottom: 22px;
}

.result-list {
  display: grid;
  gap: 12px;
  margin: 0;
}

.result-list div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.result-list dt {
  color: var(--muted);
  font-weight: 700;
}

.result-list dd {
  margin: 0;
  color: var(--text);
  font-weight: 800;
  text-align: right;
}

.audio-summary {
  margin: 18px 0 0;
  color: var(--accent-strong);
  font-weight: 800;
}

.result-note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.ratio-picker {
  display: grid;
  gap: 16px;
  margin-top: 28px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.ratio-card .ratio-picker {
  margin-top: 0;
  border-top: 0;
  padding-top: 0;
}

.ratio-picker-heading {
  display: grid;
  gap: 8px;
}

.ratio-picker-heading .eyebrow,
.ratio-picker-heading p,
.visualization-copy {
  margin: 0;
}

.ratio-picker-heading p:not(.eyebrow),
.visualization-copy {
  color: var(--muted);
}

.ratio-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 12px;
}

.ratio-controls label {
  display: grid;
  gap: 8px;
}

.ratio-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #101416;
}

.ratio-table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
}

.ratio-table th,
.ratio-table td {
  border-bottom: 1px solid var(--line);
  padding: 12px;
  text-align: left;
  vertical-align: middle;
}

.ratio-table th {
  color: var(--subtle);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.ratio-table td {
  color: var(--muted);
  font-weight: 700;
}

.ratio-table td:nth-child(2),
.ratio-table td:nth-child(3) {
  color: var(--text);
}

.ratio-table td:last-child {
  width: 112px;
}

.ratio-table tr:last-child td {
  border-bottom: 0;
}

.ratio-table tr.is-selected {
  background: rgb(111 211 192 / 10%);
}

.ratio-table-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #20272b;
  color: var(--muted);
  padding: 8px 10px;
  font-weight: 800;
  cursor: pointer;
}

.ratio-table-button:hover,
.ratio-table-button:focus-visible {
  border-color: rgb(111 211 192 / 54%);
  background: #2a3338;
  color: var(--text);
  outline: none;
}

.ratio-table-button.is-selected {
  border-color: rgb(111 211 192 / 66%);
  background: rgb(111 211 192 / 18%);
  color: var(--accent-strong);
}

@media (max-width: 700px) {
  .ratio-table-wrap {
    overflow-x: visible;
  }

  .ratio-table {
    min-width: 0;
  }

  .ratio-table thead {
    display: none;
  }

  .ratio-table,
  .ratio-table tbody,
  .ratio-table tr,
  .ratio-table td {
    display: block;
  }

  .ratio-table tr {
    border-bottom: 1px solid var(--line);
    padding: 12px;
  }

  .ratio-table tr:last-child {
    border-bottom: 0;
  }

  .ratio-table th,
  .ratio-table td {
    border-bottom: 0;
    padding: 0;
  }

  .ratio-table td {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 3px 0;
  }

  .ratio-table td::before {
    flex: 0 0 auto;
    color: var(--subtle);
    font-size: 0.74rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }

  .ratio-table td:nth-child(1)::before {
    content: "Type";
  }

  .ratio-table td:nth-child(2)::before {
    content: "Ratio";
  }

  .ratio-table td:nth-child(3)::before {
    content: "Decimal";
  }

  .ratio-table td:last-child {
    display: block;
    width: auto;
    padding-top: 10px;
  }

  .ratio-table td:last-child::before {
    content: none;
  }
}

.visualization-card {
  display: grid;
  gap: 18px;
}

.visualization-card h2 {
  margin-bottom: 0;
}

.visual-stage {
  display: grid;
  gap: 12px;
}

.reference-frame {
  --target-width: 100%;
  --target-height: 100%;
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid rgb(111 211 192 / 58%);
  border-radius: 8px;
  background: #1f9d73;
  box-shadow: inset 0 0 0 1px rgb(255 255 255 / 12%);
}

.visual-bar {
  position: absolute;
  z-index: 1;
  background: rgb(126 136 142 / 68%);
  pointer-events: none;
}

.visual-bar-top {
  top: 0;
  right: 0;
  left: 0;
  height: calc((100% - var(--target-height)) / 2);
}

.visual-bar-bottom {
  right: 0;
  bottom: 0;
  left: 0;
  height: calc((100% - var(--target-height)) / 2);
}

.visual-bar-left {
  top: calc((100% - var(--target-height)) / 2);
  bottom: calc((100% - var(--target-height)) / 2);
  left: 0;
  width: calc((100% - var(--target-width)) / 2);
}

.visual-bar-right {
  top: calc((100% - var(--target-height)) / 2);
  right: 0;
  bottom: calc((100% - var(--target-height)) / 2);
  width: calc((100% - var(--target-width)) / 2);
}

.target-frame {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  width: var(--target-width);
  height: var(--target-height);
  transform: translate(-50%, -50%);
  border: 2px solid rgb(244 247 249 / 88%);
  box-shadow: inset 0 0 0 1px rgb(13 16 17 / 42%);
  pointer-events: none;
}

.visual-dimension {
  position: absolute;
  z-index: 3;
  max-width: calc(var(--target-width) - 16px);
  overflow: hidden;
  border: 1px solid rgb(244 247 249 / 24%);
  border-radius: 6px;
  background: rgb(13 16 17 / 78%);
  color: var(--text);
  padding: 4px 7px;
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.visual-dimension-x {
  top: calc((100% - var(--target-height)) / 2 + 8px);
  left: 50%;
  transform: translateX(-50%);
}

.visual-dimension-y {
  top: 50%;
  right: calc((100% - var(--target-width)) / 2 + 8px);
  max-width: none;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
}

.visualization-results {
  margin-top: 4px;
}

.presets-section,
.sources-section {
  padding: 48px 0;
}

.bitrate-workspace .presets-section,
.bitrate-workspace .sources-section {
  padding: 48px 0 0;
}

.preset-heading p {
  max-width: 760px;
  margin: 8px 0 0;
  color: var(--muted);
}

.preset-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 210px), 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.preset-controls label {
  display: grid;
  gap: 8px;
}

.preset-count {
  margin: 0 0 16px;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 270px), 1fr));
  gap: 16px;
}

.preset-card {
  display: grid;
  gap: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 18px;
}

.preset-card-header {
  display: grid;
  gap: 8px;
}

.preset-family,
.preset-card-header p,
.preset-note,
.preset-empty {
  margin: 0;
}

.preset-card-header p,
.preset-note {
  color: var(--muted);
  font-size: 0.94rem;
}

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

.preset-metrics div {
  border-left: 2px solid rgb(111 211 192 / 36%);
  padding-left: 10px;
}

.preset-metrics dt {
  color: var(--subtle);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.preset-metrics dd {
  margin: 4px 0 0;
  color: var(--text);
  font-weight: 800;
}

.preset-button {
  width: 100%;
  border-color: var(--line);
  background: #20272b;
  color: var(--muted);
}

.preset-button:hover,
.preset-button:focus-visible {
  border-color: rgb(111 211 192 / 54%);
  background: #2a3338;
  color: var(--text);
}

.preset-button.is-selected {
  border-color: rgb(111 211 192 / 66%);
  background: rgb(111 211 192 / 18%);
  color: var(--accent-strong);
}

.source-list {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.source-list a {
  color: var(--text);
  font-weight: 700;
}

.source-list a:hover,
.source-list a:focus-visible {
  color: var(--accent-strong);
  outline: none;
}

.site-footer {
  border-top: 1px solid rgb(255 255 255 / 8%);
  padding: 24px 0;
  color: var(--subtle);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-inner p {
  margin: 0;
}

.footer-inner a {
  border-radius: 6px;
  color: var(--muted);
  font-weight: 700;
  text-decoration: none;
}

.footer-inner a:hover,
.footer-inner a:focus-visible {
  color: var(--text);
  outline: none;
}

@media (min-width: 760px) {
  .container {
    width: min(100% - 48px, var(--max-width));
  }

  .intro-grid {
    max-width: 900px;
  }

  h1 {
    font-size: 3.25rem;
  }

  h2 {
    font-size: 2.4rem;
  }

  .intro-text {
    font-size: 1.2rem;
  }

  .intro-section {
    padding: 72px 0 64px;
  }

  .tool-intro {
    padding: 56px 0 32px;
  }

  .empty-state,
  .about-card,
  .calculator-card,
  .result-card,
  .source-card {
    padding: 40px;
  }

  .tool-card {
    padding: 32px;
  }
}

@media (min-width: 1040px) {
  h1 {
    font-size: 4rem;
  }

  .intro-section {
    padding: 88px 0 72px;
  }

  .tool-intro {
    padding: 64px 0 32px;
  }

  .calculator-layout {
    grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.65fr);
    align-items: start;
  }

  .aspect-layout > .aspect-calculator-card,
  .aspect-layout > .ratio-card {
    grid-column: 1;
  }

  .aspect-layout > .visualization-card {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .bitrate-workspace {
    grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.65fr);
    align-items: start;
  }

  .bitrate-workspace > .calculator-section,
  .bitrate-workspace-main {
    grid-column: 1;
  }

  .bitrate-workspace-main {
    grid-row: 2;
  }

  .bitrate-workspace > .result-card {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .result-card {
    position: sticky;
    top: 96px;
  }
}

@media (max-width: 520px) {
  .site-nav {
    gap: 2px;
  }

  .site-nav a {
    padding: 8px;
  }

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

  .solve-options label {
    justify-content: flex-start;
  }

  .result-list div {
    display: grid;
    gap: 4px;
  }

  .result-list dd {
    text-align: left;
  }

  .preset-metrics {
    grid-template-columns: 1fr;
  }
}

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