:root {
  --paper: #FAF8F3;
  --paper-raised: #FFFFFF;
  --ink: #1C1B19;
  --ink-soft: #4A4741;
  --rule: #DAD4C6;
  --green: #2F4A3C;
  --green-deep: #223529;
  --brass: #B08D57;
  --error: #8C3B2E;
  --error-bg: #FBEEEA;

  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --radius: 3px;
  --max-line: 68ch;

  color-scheme: light;
  box-sizing: border-box;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #17181A;
    --paper-raised: #1F2123;
    --ink: #ECE8DF;
    --ink-soft: #B7B2A6;
    --rule: #35362f;
    --green: #6FA085;
    --green-deep: #4C7863;
    --brass: #C7A268;
    --error: #E38A78;
    --error-bg: #2E1D19;
  }
}
:root[data-theme="dark"] {
  --paper: #17181A;
  --paper-raised: #1F2123;
  --ink: #ECE8DF;
  --ink-soft: #B7B2A6;
  --rule: #35362f;
  --green: #6FA085;
  --green-deep: #4C7863;
  --brass: #C7A268;
  --error: #E38A78;
  --error-bg: #2E1D19;
}

* { box-sizing: inherit; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

body {
  -webkit-font-smoothing: antialiased;
}

.offline-banner {
  background: var(--brass);
  color: var(--green-deep);
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  padding: 0.5rem 1rem;
}

.masthead {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 2rem 1.5rem 1.5rem;
  max-width: 46rem;
  margin: 0 auto;
}

.masthead-mark {
  flex: 0 0 auto;
  width: 2.75rem;
  height: 2.75rem;
  border: 2px solid var(--green);
  border-radius: 50%;
  position: relative;
}
.masthead-mark::before {
  content: "1.1";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--green);
}

.masthead-text { flex: 1 1 auto; }

.eyebrow {
  margin: 0 0 0.15rem;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--brass);
  font-weight: 600;
}

.masthead h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 2.1rem;
  line-height: 1.1;
  color: var(--ink);
}

.masthead-sub {
  margin: 0.35rem 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  max-width: 34ch;
}

.install-btn {
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  background: transparent;
  border: 1px solid var(--green);
  color: var(--green);
  border-radius: var(--radius);
  padding: 0.5rem 0.9rem;
  cursor: pointer;
}
.install-btn:hover { background: var(--green); color: var(--paper); }

.layout {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.sheet {
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.75rem 1.75rem 2rem;
}

.sheet h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  margin: 0 0 0.35rem;
}

.sheet-hint {
  margin: 0 0 1.5rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
  max-width: var(--max-line);
}

form { display: flex; flex-direction: column; gap: 1.25rem; }

.field { display: flex; flex-direction: column; gap: 0.4rem; }
.field > span { font-size: 0.85rem; font-weight: 600; color: var(--ink); }
.optional { font-weight: 400; color: var(--ink-soft); }

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
@media (max-width: 34rem) {
  .field-row { grid-template-columns: 1fr; }
}

input[type="text"],
input[type="number"],
textarea,
select {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 0.6rem 0.7rem;
  width: 100%;
}
textarea { resize: vertical; font-family: var(--serif); line-height: 1.5; }
input:focus-visible, textarea:focus-visible, select:focus-visible, button:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 1px;
}

fieldset {
  border: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
fieldset legend {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--paper);
  border: 1px solid var(--green);
  color: var(--green-deep);
  border-radius: 999px;
  padding: 0.25rem 0.4rem 0.25rem 0.75rem;
  font-size: 0.85rem;
}
.tag button {
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1;
  padding: 0.1rem 0.3rem;
}

.tag-add { display: flex; gap: 0.5rem; }
.tag-add input { flex: 1; }
.tag-add button {
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--rule);
  background: var(--paper);
  border-radius: var(--radius);
  padding: 0 0.9rem;
  cursor: pointer;
}

.radio-row { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.radio-row label { display: flex; align-items: center; gap: 0.4rem; font-size: 0.9rem; }

details.advanced {
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
}
details.advanced summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--green-deep);
  margin-bottom: 1rem;
}
details.advanced[open] summary { margin-bottom: 1.25rem; }
details.advanced > *:not(summary) + * { margin-top: 1.25rem; }

.submit-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-top: 0.5rem;
}

.primary-btn {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.95rem;
  background: var(--green);
  color: var(--paper);
  border: none;
  border-radius: var(--radius);
  padding: 0.75rem 1.4rem;
  cursor: pointer;
}
.primary-btn:hover { background: var(--green-deep); }
.primary-btn:disabled { opacity: 0.6; cursor: progress; }

.submit-hint { font-size: 0.82rem; color: var(--ink-soft); }

/* --- Manuscript / output --- */

.manuscript {
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.75rem 1.75rem 2.25rem;
}

.manuscript-toolbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}
.manuscript-toolbar h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  margin: 0;
}
.toolbar-actions { display: flex; gap: 0.5rem; }
.toolbar-actions button {
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 600;
  border: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 0.4rem 0.75rem;
  cursor: pointer;
}
.toolbar-actions button:hover { border-color: var(--green); color: var(--green-deep); }

.construct-note {
  background: var(--error-bg);
  border: 1px solid var(--brass);
  color: var(--ink);
  font-size: 0.88rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.manuscript-body { max-width: var(--max-line); }
.manuscript-body h3 {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--brass);
  margin: 2rem 0 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}
.manuscript-body h3:first-child { margin-top: 0; }
.manuscript-body h3 .num {
  font-family: var(--serif);
  font-style: italic;
  color: var(--green);
  font-size: 0.95rem;
}
.manuscript-body p {
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.7;
  margin: 0 0 1.1rem;
  color: var(--ink);
}

.loading-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.spinner {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  border: 2px solid var(--rule);
  border-top-color: var(--green);
  animation: spin 0.8s linear infinite;
}
@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2.4s; }
}
@keyframes spin { to { transform: rotate(360deg); } }

.error-block { border-color: var(--error); background: var(--error-bg); }
.error-block p { margin: 0; color: var(--error); font-size: 0.92rem; }

.site-footer {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
  color: var(--ink-soft);
  font-size: 0.82rem;
}