:root {
  --paper: #f4efe4;
  --paper-raised: #fbf8f0;
  --paper-deep: #ece4d5;
  --ink: #211c16;
  --ink-soft: #5f5548;
  --ink-faint: #8a7d6c;
  --line: #d9cdb8;
  --line-strong: #b9a98e;
  --cinnabar: #a83a2a;
  --cinnabar-soft: #f0ddd5;
  --gold: #8d6f35;
  --shadow: 0 18px 50px rgb(70 52 28 / 8%);
  --radius: 14px;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141210;
    --paper-raised: #1d1915;
    --paper-deep: #241f1a;
    --ink: #ece2d2;
    --ink-soft: #b9ab97;
    --ink-faint: #8b7e6d;
    --line: #3a322a;
    --line-strong: #54483c;
    --cinnabar: #d4664f;
    --cinnabar-soft: #3a211c;
    --gold: #c8a86a;
    --shadow: 0 18px 50px rgb(0 0 0 / 35%);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 85% -10%, rgb(168 58 42 / 6%), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgb(141 111 53 / 7%), transparent 60%),
    var(--paper);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  min-height: 100vh;
}

/* ---------- masthead ---------- */

.masthead {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper-raised) 72%, transparent);
  backdrop-filter: blur(10px);
}

.masthead__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 34px 24px 26px;
}

.masthead__eyebrow {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .28em;
  color: var(--cinnabar);
  text-transform: uppercase;
}

.masthead h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(30px, 4.2vw, 46px);
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.2;
}

.masthead h1 span {
  margin-left: .5em;
  color: var(--cinnabar);
}

.masthead__sub {
  margin: 10px 0 0;
  max-width: 640px;
  color: var(--ink-soft);
  font-size: 14px;
}

/* ---------- layout ---------- */

.layout {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 24px 64px;
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.panel {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.form-panel {
  position: sticky;
  top: 20px;
  padding: 22px 20px;
}

/* ---------- form ---------- */

.field { margin: 0 0 18px; }

.field > label,
.field > legend {
  display: block;
  margin-bottom: 7px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ink-faint);
}

fieldset.field {
  padding: 0;
  border: 0;
}

input[type="datetime-local"],
input[type="number"],
select {
  width: 100%;
  padding: 10px 12px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font: inherit;
  font-size: 14px;
}

input:focus-visible,
select:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 2px;
}

.radio {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 11px;
  margin-bottom: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}

.radio:has(input:checked) {
  border-color: var(--cinnabar);
  background: var(--cinnabar-soft);
}

.radio input { accent-color: var(--cinnabar); }

.check {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  font-size: 13px;
  color: var(--ink-soft);
  cursor: pointer;
}

.check input { accent-color: var(--cinnabar); }

.field--split {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 8px;
  align-items: center;
}

.field--split > label {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

.advanced {
  margin: 4px 0 20px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.advanced summary {
  cursor: pointer;
  color: var(--ink-soft);
  font-size: 13px;
  margin-bottom: 14px;
}

.advanced .field:last-child { margin-bottom: 0; }

.submit {
  width: 100%;
  padding: 12px 16px;
  color: #fff8ee;
  background: var(--cinnabar);
  border: 1px solid var(--cinnabar);
  border-radius: 9px;
  font: inherit;
  font-weight: 600;
  letter-spacing: .08em;
  cursor: pointer;
  transition: filter .15s, transform .15s;
}

.submit:hover { filter: brightness(1.07); }
.submit:active { transform: translateY(1px); }
.submit[disabled] { cursor: wait; filter: saturate(.4) brightness(.9); }

.form-note {
  margin: 14px 0 0;
  color: var(--ink-faint);
  font-size: 12px;
  line-height: 1.65;
}

.error {
  margin: 16px 0 0;
  padding: 10px 12px;
  color: var(--cinnabar);
  background: var(--cinnabar-soft);
  border-left: 3px solid var(--cinnabar);
  border-radius: 4px;
  font-size: 13px;
}

/* ---------- result ---------- */

.result { min-width: 0; }

.result-head {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 22px;
}

.status {
  display: inline-block;
  margin: 0 0 6px;
  padding: 3px 9px;
  color: var(--gold);
  border: 1px solid color-mix(in srgb, var(--gold) 55%, transparent);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.result-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  line-height: 1.35;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ghost {
  padding: 8px 12px;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}

.ghost:hover {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
  background: var(--cinnabar-soft);
}

.block {
  margin: 0 0 26px;
  padding: 22px 22px 20px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.block h3 {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: .06em;
}

.block h3::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 10px;
  background: var(--cinnabar);
  transform: rotate(45deg) translateY(-2px);
}

/* ---------- chart ---------- */

.chart-title {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: baseline;
  margin-bottom: 14px;
}

.chart-title strong {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: .06em;
}

.chart-title span { color: var(--ink-soft); font-size: 13px; }

.chart-wrap { overflow-x: auto; }

table.chart {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  text-align: center;
  font-size: 14px;
}

table.chart th,
table.chart td {
  padding: 8px 6px;
  border: 1px solid var(--line);
}

table.chart thead th {
  color: var(--ink-faint);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: .1em;
}

table.chart tbody th {
  width: 84px;
  color: var(--ink-faint);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: .08em;
  text-align: left;
  padding-left: 12px;
}

table.chart td {
  font-family: var(--serif);
  font-size: 18px;
}

table.chart td.day-col {
  background: var(--cinnabar-soft);
}

table.chart td .small {
  display: block;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 11px;
  line-height: 1.4;
}

/* ---------- claims ---------- */

.claim {
  padding: 14px 0 14px 16px;
  border-left: 2px solid var(--line);
}

.claim + .claim { margin-top: 2px; }

.claim:hover { border-left-color: var(--line-strong); }

.claim__text {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.claim__note {
  margin: 7px 0 0;
  color: var(--ink-faint);
  font-size: 12px;
  line-height: 1.6;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 9px;
}

.rule-chip {
  padding: 1px 6px;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .02em;
  cursor: pointer;
}

.rule-chip:hover {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
  background: var(--cinnabar-soft);
}

/* ---------- coverage / disclosures ---------- */

.plain-list {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
  font-size: 13px;
}

.plain-list li + li { margin-top: 7px; }

.coverage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.coverage-grid h4 {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--ink-faint);
}

.coverage-grid ul { margin: 0; padding-left: 18px; font-size: 13px; }

/* ---------- evidence ---------- */

.evidence > summary {
  cursor: pointer;
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: .05em;
  list-style: none;
}

.evidence > summary::-webkit-details-marker { display: none; }

.evidence > summary::before {
  content: "＋";
  display: inline-block;
  width: 1.2em;
  color: var(--cinnabar);
  font-family: var(--sans);
}

.evidence[open] > summary::before { content: "－"; }

.evidence > summary:hover { color: var(--cinnabar); }

.rule-card {
  margin-top: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper);
}

.rule-card.flash {
  animation: flash 1.6s ease;
}

@keyframes flash {
  0%, 100% { box-shadow: 0 0 0 0 transparent; }
  20% { box-shadow: 0 0 0 4px color-mix(in srgb, var(--cinnabar) 28%, transparent); }
}

.rule-card__head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: baseline;
  margin-bottom: 10px;
}

.rule-card__id {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--cinnabar);
  letter-spacing: .04em;
}

.rule-card__topic { color: var(--ink-faint); font-size: 12px; }

.rule-card dl {
  margin: 0 0 12px;
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 4px 10px;
  font-size: 13px;
}

.rule-card dt { color: var(--ink-faint); }
.rule-card dd { margin: 0; }

.citation {
  margin: 10px 0 0;
  padding: 10px 12px;
  border-left: 2px solid var(--line-strong);
  background: color-mix(in srgb, var(--paper-deep) 55%, transparent);
  border-radius: 0 6px 6px 0;
}

.citation blockquote {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 14px;
  color: var(--ink-soft);
}

.citation meta {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-faint);
  letter-spacing: .02em;
}

/* ---------- footer ---------- */

.footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px 40px;
  color: var(--ink-faint);
  font-size: 12px;
}

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .form-panel { position: static; }
  .masthead__inner { padding-top: 26px; }
}

@media (max-width: 560px) {
  .layout { padding: 18px 14px 48px; }
  .masthead__inner { padding: 24px 16px 20px; }
  .block { padding: 18px 14px; }
  .result-head { flex-direction: column; }
  .actions { width: 100%; }
  .ghost { flex: 1; }
}

@media print {
  .form-panel, .actions, .footer { display: none; }
  .layout { display: block; padding: 0; }
  .block { box-shadow: none; break-inside: avoid; }
}