@import url("https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@500;600&family=DM+Mono&display=swap");
:root {
  --paper: #f3f0e7;
  --surface: #fbfaf5;
  --ink: #30362e;
  --muted: #626a5d;
  --line: #cbd0bf;
  --accent: #b84326;
  --accent-ink: #fff8ed;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font:
    14px/1.8 "Zen Kaku Gothic New",
    sans-serif;
}
header,
main {
  max-width: 1320px;
  margin: auto;
  padding: 0 36px;
}
header {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  gap: 20px;
}
.brand {
  font:
    16px "DM Mono",
    monospace;
  letter-spacing: 0.06em;
  text-decoration: none;
}
.brand span {
  font:
    11px "Zen Kaku Gothic New",
    sans-serif;
  margin-left: 18px;
  color: var(--muted);
}
nav {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}
nav a {
  white-space: nowrap;
}
a {
  color: inherit;
  text-underline-offset: 4px;
}
a:hover {
  color: var(--accent);
}
button,
input,
select {
  font: inherit;
  color: inherit;
}
button,
select,
input[type="number"],
.file-button {
  min-height: 42px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 4px;
  padding: 8px 13px;
}
button,
.file-button {
  cursor: pointer;
  white-space: nowrap;
  transition:
    background 160ms,
    color 160ms;
}
button:hover:not(:disabled),
.file-button:hover {
  background: #e5e8dc;
}
button:active:not(:disabled) {
  transform: translateY(1px);
}
button:disabled {
  cursor: default;
  color: #75786d;
  border-style: dashed;
  background: #eeece3;
}
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}
button.primary:hover:not(:disabled) {
  background: #96391f;
}
button.primary:disabled {
  background: #eeece3;
  color: #75786d;
  border-color: var(--line);
}
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
input[type="range"] {
  accent-color: var(--accent);
  min-width: 0;
  width: 100px;
}
input[type="checkbox"] {
  accent-color: var(--accent);
}
h1,
h2 {
  font-family: "Noto Serif JP", serif;
  font-weight: 500;
  text-wrap: balance;
}
h1 {
  font-size: clamp(28px, 3.2vw, 43px);
  line-height: 1.5;
  margin: 8px 0 0;
  min-width: 0;
  overflow-wrap: anywhere;
}
h2 {
  font-size: 24px;
  line-height: 1.55;
  margin: 0 0 14px;
}
h3 {
  font-size: 15px;
  margin: 0 0 12px;
}
p {
  margin: 0 0 12px;
}
.fine,
.hint {
  font-size: 12px;
  color: var(--muted);
}
.eyebrow {
  font:
    11px "DM Mono",
    monospace;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}
.heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  padding: 28px 0 30px;
  gap: 25px;
}
.heading > p {
  max-width: 380px;
  margin: 0;
  line-height: 2;
}
.workbench {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  border: 1px solid var(--line);
  background: var(--surface);
}
.fly-stage {
  background: #e8e9df;
  padding: 20px 24px 16px;
  min-width: 0;
}
.stage-label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 11px;
}
.stage-label strong {
  font-weight: 500;
  color: var(--accent);
}
#fly3d {
  width: 100%;
  height: 255px;
  display: block;
  touch-action: pan-y;
  cursor: grab;
}
.stage-bottom {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 11px;
  color: var(--muted);
}
.rotate-label {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
}
.rotate-label input {
  width: 150px;
}
.neural-readout {
  border-top: 1px solid #c6cbbd;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding-top: 12px;
  align-items: center;
  font-size: 11px;
}
.neural-readout strong {
  font:
    18px "DM Mono",
    monospace;
}
.desk {
  padding: 22px 26px;
}
.desk h2 {
  margin-bottom: 5px;
}
.keyboard {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 5px;
  margin: 12px 0;
}
.keyboard button {
  height: 52px;
  padding: 0;
  border-bottom: 4px solid var(--line);
  font-family: "Noto Serif JP", serif;
}
.editor-label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
}
.note-strip {
  display: flex;
  min-height: 51px;
  gap: 6px;
  align-items: center;
  margin: 5px 0 9px;
  flex-wrap: wrap;
}
.note-strip button {
  border: 1px solid #c77b61;
  color: var(--accent);
  padding: 5px 13px;
  min-height: 40px;
}
.note-strip small {
  margin-left: 7px;
  font-size: 10px;
}
.small-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.small-actions button,
.file-button {
  font-size: 12px;
}
.options {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 14px 0;
  font-size: 11px;
  align-items: center;
}
.options label {
  display: flex;
  align-items: center;
  gap: 6px;
}
.options input[type="number"] {
  width: 68px;
  padding: 4px;
  min-height: 34px;
}
.options select {
  padding: 4px;
  min-height: 34px;
}
.lesson-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
#lesson-status {
  font-size: 12px;
  margin: 10px 0 5px;
  min-height: 42px;
}
#error {
  color: #92301c;
  border: 1px solid #c77b61;
  padding: 10px;
  font-size: 12px;
}
.check {
  font-size: 11px;
}
.reply-section {
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}
.section-title {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
}
#test-kind {
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 14px;
}
.comparison-roll {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 20px;
}
.comparison-roll > div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  align-items: center;
  padding: 12px 0;
  gap: 12px;
}
.comparison-roll > div + div {
  border-top: 1px solid var(--line);
}
.comparison-roll h3 {
  font-size: 12px;
  margin: 0;
}
.score-line {
  display: flex;
  gap: 6px;
  align-items: end;
  min-height: 50px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--muted);
}
.score-note {
  min-width: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  background: #e6e9de;
  color: var(--ink);
  border-bottom: 3px solid #9aa58d;
  height: 48px;
}
.score-note.long {
  min-width: 68px;
}
.score-note small {
  font-size: 9px;
}
.score-note.wrong {
  background: #f4e3da;
  border-color: var(--accent);
}
.score-note.current {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.metrics {
  display: flex;
  gap: 25px;
  flex-wrap: wrap;
  margin: 16px 0;
}
.metrics strong {
  font:
    24px "DM Mono",
    monospace;
  margin-right: 6px;
}
.reply-section > .fine {
  margin-top: 12px;
}
.controls-section {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.7fr);
  gap: 55px;
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}
.controls-section p {
  max-width: 65ch;
}
.controls-section label {
  font-size: 12px;
}
.controls-section input[type="number"] {
  width: 90px;
  margin-left: 10px;
}
.controls-section aside {
  border-left: 1px solid var(--line);
  padding-left: 30px;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  margin: 18px 0;
}
caption {
  text-align: left;
  color: var(--muted);
  font-size: 11px;
}
th,
td {
  text-align: left;
  padding: 9px;
  border-bottom: 1px solid var(--line);
}
table button {
  font-size: 11px;
  padding: 3px 7px;
  min-height: 30px;
}
.table-wrap {
  overflow: auto;
}
details {
  margin: 20px 0;
}
summary {
  cursor: pointer;
}
.file-button input {
  width: 100%;
  max-width: 220px;
  display: block;
  font-size: 11px;
  margin-top: 6px;
}
#storage-status {
  margin-top: 12px;
}
.how {
  padding: 40px 0;
}
.explain-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 25px 55px;
  margin: 30px 0;
}
.explain-grid p {
  font-size: 13px;
  max-width: 65ch;
}
footer {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  padding: 24px 0 36px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  color: var(--muted);
}
.skip {
  position: absolute;
  left: 10px;
  top: -80px;
  background: var(--surface);
  padding: 8px;
  z-index: 2;
}
.skip:focus {
  top: 10px;
}
@media (min-width: 1500px) {
  #fly3d {
    height: 290px;
  }
}
@media (max-width: 800px) {
  header,
  main {
    padding-left: 18px;
    padding-right: 18px;
  }
  .brand span {
    display: none;
  }
  .heading {
    display: block;
  }
  .heading > p {
    margin-top: 14px;
  }
  .workbench {
    grid-template-columns: minmax(0, 1fr);
  }
  #fly3d {
    height: 230px;
  }
  .fly-stage,
  .desk {
    padding: 18px;
  }
  .controls-section {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
  .controls-section aside {
    border-left: 0;
    padding-left: 0;
  }
  .explain-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }
  .section-title {
    display: block;
  }
  .comparison-roll {
    padding: 12px;
  }
  .comparison-roll > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 5px;
  }
  .small-actions {
    gap: 6px;
  }
  .heading {
    padding-top: 22px;
  }
  nav {
    gap: 12px;
    font-size: 12px;
  }
  .brand {
    font-size: 13px;
  }
  .stage-label {
    flex-wrap: wrap;
  }
  .stage-bottom {
    flex-wrap: wrap;
  }
  button {
    padding-left: 10px;
    padding-right: 10px;
  }
  .metrics {
    gap: 14px;
  }
  .score-note {
    min-width: 30px;
  }
  .score-note.long {
    min-width: 52px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}
@media (max-width: 600px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 14px;
    padding-bottom: 14px;
  }
}

.reaction-section {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 32px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
  align-items: center;
}
.reaction-section p {
  font-size: 12px;
  max-width: 60ch;
}
.reaction-section .fine {
  font-size: 11px;
}
.reaction-section label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  margin: 0 8px 12px 0;
}
#reaction-png {
  font-size: 12px;
}
#reaction-map {
  width: 100%;
  height: 340px;
  display: block;
  border-radius: 4px;
}
#reaction-summary {
  margin-top: 12px;
}
@media (max-width: 800px) {
  .reaction-section {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }
}