:root {
  color-scheme: light;
  --paper: #f3efe4;
  --paper-deep: #e9e1cf;
  --ink: #28323a;
  --muted: #657078;
  --green: #315c55;
  --green-soft: #d8e4df;
  --blue: #345b86;
  --blue-soft: #dbe4ef;
  --amber: #c28b3b;
  --amber-soft: #f1e2c4;
  --red: #c4554f;
  --red-soft: #f2d9d5;
  --line: #c9bea8;
  --wood: #493b31;
  --shadow: 0 14px 34px rgb(40 50 58 / 12%);
  font-family: "BIZ UDPGothic", "Yu Gothic UI", "Yu Gothic", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--paper);
  line-height: 1.7;
}

a {
  color: var(--blue);
  text-underline-offset: 0.22em;
}

button,
textarea,
select {
  font: inherit;
}

button,
.button {
  border: 1px solid var(--green);
  border-radius: 0.55rem;
  padding: 0.72rem 1rem;
  color: white;
  background: var(--green);
  box-shadow: 0 3px 0 #254740;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
}

button:hover,
.button:hover {
  transform: translateY(-1px);
}

button:focus-visible,
a:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.6rem;
  left: 0.6rem;
  padding: 0.5rem 0.8rem;
  background: var(--ink);
  color: white;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: none;
}

.site-header,
.site-footer {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0.05em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border: 2px solid var(--green);
  border-radius: 0.35rem;
  background: var(--paper);
}

.brand-mark::before {
  content: "ƒ";
  color: var(--green);
  font-family: Georgia, serif;
  font-size: 1.35rem;
  font-style: italic;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.9rem;
}

.site-nav a {
  color: var(--ink);
  font-size: 0.92rem;
  text-decoration: none;
}

main {
  width: min(1180px, calc(100% - 2rem));
  min-height: 70vh;
  margin-inline: auto;
  padding: 2.8rem 0 4rem;
}

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

h1 {
  max-width: 18ch;
  margin-bottom: 0.75rem;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.75rem, 3.8vw, 2.35rem);
  line-height: 1.3;
  letter-spacing: 0.035em;
}

h2 {
  font-size: clamp(1.25rem, 2.2vw, 1.6rem);
  line-height: 1.45;
}

h3 {
  font-size: 1.04rem;
}

.eyebrow {
  margin-bottom: 0.55rem;
  color: var(--green);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.lead {
  max-width: 48rem;
  color: #465159;
  font-size: 1.04rem;
}

.workbench-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(270px, 0.75fr);
  gap: 1.6rem;
  align-items: center;
  margin-bottom: 1.8rem;
}

.flow-instrument {
  display: grid;
  grid-template-columns: 0.8fr auto 1fr;
  gap: 0.65rem;
  align-items: center;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: #f9f6ee;
  box-shadow: var(--shadow);
}

.formula-roll {
  display: flex;
  gap: 0.35rem;
  overflow: hidden;
  padding: 0.7rem;
  border: 1px dashed var(--line);
  background: white;
}

.formula-roll i {
  display: block;
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 0.2rem;
  background: var(--blue-soft);
}

.formula-roll i:nth-child(2n) {
  background: var(--amber-soft);
}

.formula-roll i:nth-child(3n) {
  background: var(--green-soft);
}

.machine-gate {
  width: 2.7rem;
  height: 3.4rem;
  border: 4px solid var(--wood);
  border-radius: 0.45rem;
  background: var(--amber);
  box-shadow: inset 0 0 0 3px #e5c88d;
}

.output-trays {
  display: grid;
  gap: 0.35rem;
}

.output-trays span {
  display: block;
  min-height: 1.5rem;
  border-left: 0.55rem solid var(--green);
  background: var(--green-soft);
}

.output-trays span:nth-child(2) {
  width: 82%;
  border-left-color: var(--blue);
  background: var(--blue-soft);
}

.output-trays span:nth-child(3) {
  width: 64%;
  border-left-color: var(--red);
  background: var(--red-soft);
}

.privacy-seal {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 1rem;
  color: var(--green);
  font-size: 0.9rem;
  font-weight: 700;
}

.privacy-seal::before {
  content: "";
  width: 0.82rem;
  height: 0.82rem;
  border: 3px solid var(--green);
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px var(--paper);
  background: var(--green);
}

.composer {
  padding: clamp(1rem, 2.8vw, 1.5rem);
  border: 1px solid var(--line);
  border-top: 0.5rem solid var(--wood);
  border-radius: 0.75rem;
  background: #fbf8f0;
  box-shadow: var(--shadow);
}

.composer-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
}

.composer label {
  display: block;
  margin-bottom: 0.55rem;
  font-weight: 800;
}

#character-count {
  color: var(--muted);
  font-size: 0.82rem;
}

#formula-input {
  width: 100%;
  min-height: 8.8rem;
  resize: vertical;
  padding: 1rem;
  border: 1px solid #9c927f;
  border-radius: 0.55rem;
  color: var(--ink);
  background: white;
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.96rem;
  line-height: 1.65;
}

.composer-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: center;
  margin-top: 0.85rem;
}

.composer small {
  color: var(--muted);
}

.example-rack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.example-rack button {
  padding: 0.42rem 0.65rem;
  border-color: var(--line);
  color: var(--ink);
  background: var(--paper);
  box-shadow: none;
  font-size: 0.83rem;
  font-weight: 600;
}

.results-shell {
  scroll-margin-top: 1rem;
  margin-top: 2rem;
}

.result-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
}

#result-status {
  padding: 0.38rem 0.7rem;
  border-radius: 999px;
  color: var(--green);
  background: var(--green-soft);
  font-size: 0.86rem;
  font-weight: 800;
}

#result-status[data-severity="warning"] {
  color: #7d2c27;
  background: var(--red-soft);
}

#result-status[data-severity="notice"] {
  color: #74511b;
  background: var(--amber-soft);
}

.token-panel,
.analysis-panel,
.question-panel,
.guide-card,
.content-card {
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: #fbf8f0;
}

.token-panel {
  padding: 1rem;
}

.token-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.28rem;
  min-height: 3.1rem;
  padding: 0.75rem;
  border: 1px dashed var(--line);
  background: white;
  font-family: "Cascadia Mono", Consolas, monospace;
}

.token {
  padding: 0.18rem 0.32rem;
  border-radius: 0.22rem;
}

.token-name {
  color: #173d37;
  background: var(--green-soft);
}

.token-reference {
  color: #1d4169;
  background: var(--blue-soft);
}

.token-string,
.token-number {
  color: #755219;
  background: var(--amber-soft);
}

.token-error,
.token-unknown {
  color: #822e29;
  background: var(--red-soft);
}

.token-lparen,
.token-rparen,
.token-comma,
.token-operator,
.token-percent,
.token-semicolon {
  border: 1px solid var(--line);
  background: var(--paper);
}

.analysis-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.analysis-panel {
  min-width: 0;
  padding: 1rem;
}

.panel-label {
  display: inline-block;
  margin-bottom: 0.8rem;
  padding-bottom: 0.2rem;
  border-bottom: 0.22rem solid var(--amber);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.diagnostics-list,
.function-roots,
.function-children {
  margin: 0;
  padding: 0;
  list-style: none;
}

.diagnostic {
  margin-bottom: 0.75rem;
  padding: 0.72rem;
  border-left: 0.35rem solid var(--green);
  background: var(--green-soft);
}

.diagnostic-warning {
  border-left-color: var(--red);
  background: var(--red-soft);
}

.diagnostic-notice {
  border-left-color: var(--amber);
  background: var(--amber-soft);
}

.diagnostic p,
.function-node p {
  margin: 0.2rem 0 0;
  color: #4a545a;
  font-size: 0.88rem;
}

.function-node {
  position: relative;
  margin-bottom: 0.55rem;
  padding: 0.65rem;
  border: 1px solid var(--line);
  background: white;
}

.function-children {
  margin-top: 0.55rem;
  padding-left: 0.75rem;
  border-left: 0.2rem solid var(--blue-soft);
}

.function-line,
.reference-card {
  display: flex;
  justify-content: space-between;
  gap: 0.55rem;
  align-items: center;
}

.function-name {
  color: var(--green);
  font-family: "Cascadia Mono", Consolas, monospace;
}

.argument-count {
  color: var(--muted);
  font-size: 0.78rem;
}

.reference-map {
  display: grid;
  gap: 0.55rem;
}

.reference-card {
  padding: 0.65rem;
  border: 1px solid #b8c6d5;
  background: var(--blue-soft);
}

.reference-card code {
  overflow-wrap: anywhere;
  color: #1d4169;
}

.reference-detail {
  display: grid;
  justify-items: end;
  color: #40586f;
  font-size: 0.78rem;
}

.question-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: end;
  margin-top: 1rem;
  padding: 1rem;
}

#question-card {
  min-height: 9rem;
  margin: 0;
  padding: 0.8rem;
  overflow: auto;
  border: 1px solid var(--line);
  background: white;
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.82rem;
  white-space: pre-wrap;
}

.empty-state {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.guide-strip,
.guide-grid,
.source-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.guide-card,
.content-card {
  padding: 1rem;
}

.guide-symbol {
  display: grid;
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: 0.7rem;
  place-items: center;
  border: 2px solid var(--green);
  border-radius: 0.4rem;
  color: var(--green);
  background: var(--green-soft);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-weight: 800;
}

.index-section {
  margin-top: 3rem;
}

.link-rack {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
}

.link-rack a {
  display: grid;
  min-height: 5rem;
  align-content: center;
  padding: 0.8rem;
  border: 1px solid var(--line);
  border-left: 0.35rem solid var(--blue);
  color: var(--ink);
  background: #fbf8f0;
  text-decoration: none;
}

.link-rack strong,
.link-rack small {
  display: block;
}

.link-rack small {
  color: var(--muted);
}

.content-shell {
  max-width: 860px;
}

.content-card + .content-card {
  margin-top: 1rem;
}

.syntax-box {
  overflow-x: auto;
  padding: 0.9rem;
  border-left: 0.4rem solid var(--blue);
  background: var(--blue-soft);
  font-family: "Cascadia Mono", Consolas, monospace;
  white-space: nowrap;
}

.note-box {
  padding: 0.85rem;
  border: 1px solid #d5b87e;
  background: var(--amber-soft);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.6rem 1rem;
  padding: 1.2rem 0 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 860px) {
  .workbench-intro,
  .analysis-grid,
  .guide-strip,
  .guide-grid,
  .source-grid {
    grid-template-columns: 1fr;
  }

  .analysis-grid {
    gap: 0.75rem;
  }

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

@media (max-width: 620px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  main {
    padding-top: 1.8rem;
  }

  .flow-instrument {
    grid-template-columns: 1fr;
  }

  .machine-gate {
    width: 100%;
    height: 1.6rem;
  }

  .question-panel,
  .link-rack {
    grid-template-columns: 1fr;
  }

  .composer-actions,
  .result-header {
    align-items: stretch;
    flex-direction: column;
  }

  #analyze-button,
  #copy-question {
    width: 100%;
  }
}

@media print {
  .site-header,
  .site-footer,
  .composer,
  .example-rack,
  button {
    display: none !important;
  }

  body {
    background: white;
  }

  main {
    width: 100%;
    padding: 0;
  }
}