:root {
  color-scheme: light;
  --bg: #f7f7f4;
  --surface: #ffffff;
  --ink: #1e2421;
  --muted: #5e6762;
  --subtle: #858d88;
  --line: #dadbd5;
  --line-strong: #b9bbb2;
  --accent: #284f3f;
  --accent-soft: #e7eee9;
  --warning: #7d4f19;
  --warning-soft: #f6eadb;
  --error: #7d2c2c;
  --error-soft: #f4e4e1;
  --radius: 6px;
  --shadow: 0 18px 48px rgba(28, 35, 31, 0.08);
  --content: 1040px;
}

* { box-sizing: border-box; }

html { min-width: 320px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.55;
}

button,
input,
select,
textarea {
  font: inherit;
}

button { color: inherit; }

a {
  color: var(--accent);
  text-underline-offset: 3px;
}

.app-shell {
  width: min(var(--content), calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 40px;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 56px;
  align-items: end;
  padding: 24px 0 44px;
  border-bottom: 1px solid var(--line);
}

.product-name,
.section-kicker,
.scope-label,
.field-label {
  margin: 0 0 10px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 780px;
  margin-bottom: 22px;
  font-size: clamp(2.35rem, 7vw, 5rem);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: 0;
}

.lede {
  max-width: 690px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.32rem);
  line-height: 1.55;
}

.scope-note {
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.scope-note p:last-child { margin-bottom: 0; color: var(--muted); }

.ask-panel,
.result-panel,
.principles {
  margin-top: 30px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.ask-panel,
.result-panel { padding: clamp(22px, 4vw, 36px); }

.panel-heading {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 22px;
}

.panel-heading h2,
.result-header h2,
.principles h2,
.feedback-panel h3,
.follow-up h3 {
  margin-bottom: 6px;
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.25;
}

.panel-heading p,
.feedback-panel p,
.principles p {
  max-width: 460px;
  margin-bottom: 0;
  color: var(--muted);
}

.question-form label,
.feedback-form label,
.feedback-form legend {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.86rem;
  font-weight: 650;
}

textarea,
input,
select {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
}

textarea {
  min-height: 132px;
  padding: 15px 16px;
  resize: vertical;
}

input,
select { min-height: 44px; padding: 10px 12px; }

textarea:focus,
input:focus,
select:focus {
  outline: 2px solid rgba(40, 79, 63, 0.22);
  border-color: var(--accent);
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.primary-button,
.secondary-button,
.examples button {
  min-height: 42px;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  cursor: pointer;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.94rem;
  font-weight: 700;
}

.primary-button {
  padding: 0 22px;
  background: var(--accent);
  color: #fff;
}

.secondary-button {
  padding: 0 18px;
  background: #fff;
  color: var(--accent);
}

.primary-button:disabled,
.secondary-button:disabled { opacity: 0.56; cursor: wait; }

.examples {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.examples button {
  min-height: 36px;
  padding: 0 13px;
  background: var(--accent-soft);
  color: var(--accent);
  border-color: #c8d6ce;
}

.status-message {
  min-height: 1.4em;
  margin: 0;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.9rem;
}

.status-message.loading {
  position: relative;
  display: inline-block;
  padding-bottom: 8px;
}

.status-message.loading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 140px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: quiet-progress 1.8s ease-in-out infinite;
}

@keyframes quiet-progress {
  0% { opacity: 0.25; transform: translateX(0) scaleX(0.35); }
  50% { opacity: 0.85; transform: translateX(18px) scaleX(0.85); }
  100% { opacity: 0.25; transform: translateX(0) scaleX(0.35); }
}

.status-message.error { color: var(--error); }
.status-message.success { color: var(--accent); }

.result-header {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: start;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.coverage-badge {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--warning-soft);
  color: var(--warning);
  border: 1px solid #e2caa7;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.coverage-badge.answerable { background: var(--accent-soft); color: var(--accent); border-color: #bfd0c6; }
.coverage-badge.unsupported { background: var(--error-soft); color: var(--error); border-color: #e2bdb6; }

.result-block { padding: 22px 0; border-bottom: 1px solid var(--line); }
.result-block:last-of-type { border-bottom: none; }

.question-text,
.answer-text {
  margin-bottom: 0;
  white-space: pre-wrap;
}

.question-text { color: var(--muted); font-size: 1.04rem; }
.answer-text { font-size: 1.18rem; line-height: 1.62; }

.detail-section {
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}

.detail-section summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  list-style: none;
  cursor: pointer;
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 750;
}

.detail-section summary::-webkit-details-marker { display: none; }
.summary-control::before { content: "expand"; color: var(--subtle); font-size: 0.82rem; font-weight: 650; }
.detail-section[open] .summary-control::before { content: "collapse"; }

.detail-body { padding-top: 16px; color: var(--muted); }

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
}

.evidence-grid div {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfbfa;
}

.evidence-grid dt {
  margin-bottom: 8px;
  color: var(--subtle);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.evidence-grid dd { margin: 0; color: var(--ink); overflow-wrap: anywhere; }

.follow-up,
.feedback-panel { padding-top: 24px; }

.follow-up-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.feedback-panel {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 28px;
  margin-top: 26px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfbfa;
}

.feedback-form {
  display: grid;
  gap: 14px;
}

.feedback-form fieldset {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  border: 0;
}

.feedback-form fieldset label {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  margin: 0;
  color: var(--ink);
  font-weight: 500;
}

.feedback-form input[type="radio"] { width: auto; min-height: auto; }

.principles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  overflow: hidden;
  background: var(--line);
}

.principles > div {
  padding: 26px;
  background: var(--surface);
}

.site-footer {
  width: min(var(--content), calc(100% - 40px));
  margin: 0 auto;
  padding: 0 0 42px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.9rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 820px) {
  .app-shell { width: min(100% - 28px, var(--content)); padding-top: 28px; }
  .intro,
  .panel-heading,
  .feedback-panel,
  .principles { grid-template-columns: 1fr; }
  .intro { gap: 24px; }
  .panel-heading { display: block; }
  .evidence-grid { grid-template-columns: 1fr; }
  .follow-up-form { grid-template-columns: 1fr; }
  .site-footer { width: min(100% - 28px, var(--content)); flex-direction: column; }
}

@media (max-width: 520px) {
  .ask-panel,
  .result-panel { padding: 18px; }
  .result-header { flex-direction: column; }
  .examples { display: grid; }
  .examples button { width: 100%; }
  .feedback-panel { padding: 18px; }
}