:root {
  color-scheme: light;
  --paper: #f5f4ef;
  --surface: #fbfaf6;
  --ink: #222824;
  --muted: #687069;
  --line: #cfd3cc;
  --line-strong: #9fa79f;
  --accent: #245b49;
  --accent-soft: #e2ebe5;
  --danger: #9b2f2f;
  --ray-a: #b35a30;
  --ray-b: #356d92;
  --max-width: 1120px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 0;
  background: var(--paper);
}

button,
input,
select {
  font: inherit;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}



.site-brand {
  color: var(--accent);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  white-space: nowrap;
}

.language-switch {
  display: flex;
  align-items: center;
  border: 1px solid var(--line-strong);
  background: #fff;
}

main {
  padding: 48px 32px 64px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 5px;
  color: var(--accent);
  font-size: 0.77rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
p {
  overflow-wrap: anywhere;
}

h2 {
  margin: 0;
  font-size: clamp(1.3rem, 2vw, 1.65rem);
  line-height: 1.35;
}

.assumption,
.scope-note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
  font-size: 0.92rem;
}

.tool-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: 22px;
  align-items: start;
}

.calculator-panel,
.motion-panel,
.content-section {
  min-width: 0;
  border: 1px solid var(--line);
  background: #fff;
}

.calculator-panel,
.motion-panel {
  padding: 24px;
}

.content-section {
  margin-top: 24px;
  padding: 26px;
}

.section-heading {
  margin-bottom: 20px;
}

.section-heading--motion {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

legend {
  margin-bottom: 9px;
  font-weight: 700;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.mode-option {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 46px;
  padding: 9px 11px;
  border: 1px solid var(--line);
  background: var(--surface);
  cursor: pointer;
}

.mode-option:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.mode-option:focus-within {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.mode-option input:focus-visible {
  outline: 0;
}

.mode-help {
  min-height: 2.8em;
  margin: 12px 0 18px;
  color: var(--muted);
  font-size: 0.9rem;
}

.input-grid {
  display: grid;
  gap: 16px;
}

.field-group {
  min-width: 0;
}

.field-group > label,
.output-unit-row > label {
  display: block;
  margin-bottom: 6px;
  font-weight: 700;
}

.field-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 88px;
  gap: 8px;
}

input,
select {
  width: 100%;
  min-width: 0;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: #fff;
  color: var(--ink);
}

input[aria-invalid="true"] {
  border-color: var(--danger);
}

.field-help {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.field-error,
.form-error {
  margin: 5px 0 0;
  color: var(--danger);
  font-size: 0.86rem;
  font-weight: 650;
}

.image-type-group {
  padding: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.image-type-options {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.image-type-options label {
  display: flex;
  gap: 7px;
  align-items: center;
}

.image-type-options input {
  width: auto;
  min-height: 0;
}

.output-unit-row {
  margin-top: 18px;
}

.output-unit-row select {
  max-width: 140px;
}

.form-actions,
.playback-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.button {
  min-height: 44px;
  padding: 9px 16px;
  border: 1px solid var(--accent);
  border-radius: 0;
  font-weight: 750;
  cursor: pointer;
}

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

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

.button:disabled {
  border-color: var(--line);
  background: #eceeea;
  color: #858b85;
  cursor: not-allowed;
}

.result-box {
  margin-top: 22px;
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.result-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.result-main {
  margin: 7px 0 0;
  color: var(--accent);
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  font-weight: 850;
  line-height: 1.2;
}

.result-sub,
.result-formula {
  margin: 8px 0 0;
}

.result-formula {
  font-family: ui-monospace, "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.9rem;
}

.result-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 14px;
}

.result-metric {
  padding: 9px 10px;
  border-left: 3px solid var(--accent);
  background: #fff;
}

.result-metric span {
  display: block;
  color: var(--muted);
  font-size: 0.76rem;
}

.result-metric strong {
  display: block;
  margin-top: 2px;
}

.status-badge {
  flex: 0 0 auto;
  margin: 0;
  padding: 5px 9px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.motion-summary {
  min-height: 3em;
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.92rem;
}

.canvas-frame {
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fbfcfa;
}

canvas {
  display: block;
  width: 100%;
  min-width: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Arial Unicode MS", sans-serif;
}

.canvas-description,
.scale-note {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.scale-note {
  padding-left: 11px;
  border-left: 2px solid var(--line-strong);
}

.motion-values {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.motion-values > div {
  padding: 9px 10px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.motion-values span {
  display: block;
  color: var(--muted);
  font-size: 0.76rem;
}

.motion-values strong {
  display: block;
  margin-top: 2px;
  font-family: ui-monospace, "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.88rem;
  font-weight: 700;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  min-width: 0;
  padding: 13px;
  border-top: 3px solid var(--accent);
  background: var(--surface);
  counter-increment: step;
}

.steps li::before {
  display: block;
  margin-bottom: 4px;
  color: var(--accent);
  content: counter(step);
  font-weight: 850;
}

.formula-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.formula-list p {
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.formula-list strong,
.formula-list span {
  display: block;
}

.formula-list strong {
  margin-bottom: 5px;
  color: var(--accent);
  font-family: ui-monospace, "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
}

.formula-list span {
  color: var(--muted);
  font-size: 0.88rem;
}

@media (max-width: 980px) {.site-brand {
    grid-column: 1 / -1;
  }

  .language-switch {
    grid-column: 2;
    grid-row: 2;
  }
}

@media (max-width: 900px) {.tool-layout {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 600px) {main {
    padding: 34px 16px 48px;
  }

  .calculator-panel,
  .motion-panel,
  .content-section {
    padding: 18px;
  }

  .section-heading--motion {
    display: block;
  }

  .status-badge {
    display: inline-block;
    margin-top: 9px;
  }

  .result-metrics,
  .formula-list,
  .steps {
    grid-template-columns: 1fr;
  }

  .form-actions,
  .playback-controls {
    display: grid;
    grid-template-columns: 1fr;
  }
}

@media (max-width: 430px) {.field-row {
    grid-template-columns: minmax(0, 1fr) 76px;
  }
}

@media (max-width: 360px) {.mode-grid {
    grid-template-columns: 1fr;
  }

  .calculator-panel,
  .motion-panel,
  .content-section {
    padding: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {html {
    scroll-behavior: auto;
  }
}