/* ---------------------------------------------------------------
   BMO — Feed Reasoning
   Token system: grayscale only, per brief.
   ink        #111111  primary text / borders on inversion
   paper      #FFFFFF  page background
   paper-dim  #F4F4F4  panel background
   line       #DDDDDD  hairline borders/dividers
   muted      #6E6E6E  secondary text
   charcoal   #161616  the one inverted surface (reasoning panel)
   ------------------------------------------------------------- */

:root {
  --ink: #111111;
  --paper: #ffffff;
  --paper-dim: #f4f4f4;
  --line: #dddddd;
  --muted: #6e6e6e;
  --charcoal: #161616;

  --font-display: "Newsreader", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.5;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 24px 80px;
}

/* ---------------- Masthead ---------------- */

.masthead {
  border-bottom: 1px solid var(--line);
  padding-bottom: 32px;
  margin-bottom: 40px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}

.title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 40px;
  line-height: 1.1;
  margin: 0 0 16px;
  color: var(--ink);
}

.subtitle {
  font-size: 16px;
  color: var(--muted);
  max-width: 52ch;
  margin: 0;
}

/* ---------------- Input panel ---------------- */

.panel {
  border: 1px solid var(--line);
  background: var(--paper-dim);
  padding: 24px;
  margin-bottom: 32px;
}

.field-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

.feed-input {
  width: 100%;
  resize: vertical;
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 12px 14px;
  line-height: 1.6;
}

.feed-input:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 1px;
}

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

.btn-primary {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  padding: 11px 20px;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--charcoal);
}

.btn-primary:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.btn-primary:disabled {
  background: var(--muted);
  border-color: var(--muted);
  cursor: default;
}

.status-text {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}

/* ---------------- Error banner ---------------- */

.error-banner {
  border: 1px solid var(--ink);
  padding: 14px 16px;
  font-size: 14px;
  margin-bottom: 32px;
}

/* ---------------- Feed results ---------------- */

.section-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 16px;
}

.feed-results {
  margin-bottom: 40px;
}

.feed-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.feed-card {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.feed-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

.feed-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  margin: 0;
}

.feed-status {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.feed-status.is-error {
  color: var(--ink);
  font-weight: 500;
}

.feed-url {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  word-break: break-all;
  margin: 0 0 12px;
}

.feed-error-text {
  font-size: 14px;
  color: var(--ink);
  margin: 8px 0 0;
}

.article-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-list li {
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.article-title {
  font-size: 14px;
  color: var(--ink);
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  margin-top: 2px;
}

.article-meta a {
  color: var(--muted);
}

/* ---------------- Reasoning (signature: the one inverted surface) ---------------- */

.reasoning-section {
  margin-bottom: 40px;
}

.degraded-note {
  border: 1px solid var(--ink);
  padding: 10px 14px;
  font-size: 13px;
  margin: 0 0 16px;
}

.analysis-body {
  background: var(--charcoal);
  color: var(--paper);
  padding: 28px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
}

.analysis-body p {
  margin: 0 0 14px;
}

.analysis-body p:last-child {
  margin-bottom: 0;
}

.analysis-footnote {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  margin: 10px 0 0;
}

/* ---------------- Reasoning groups (progressive disclosure) ---------------- */

.reasoning-groups {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
}

.reasoning-group {
  border-top: 1px solid var(--line);
  padding: 16px 0;
}

.reasoning-group[open] {
  padding-bottom: 20px;
}

.reasoning-group-summary {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

.reasoning-group-summary::-webkit-details-marker {
  display: none;
}

.reasoning-group-summary::before {
  content: "+ ";
  color: var(--muted);
}

.reasoning-group[open] > .reasoning-group-summary::before {
  content: "– ";
}

.reasoning-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.reasoning-list li {
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.reasoning-list-plain li {
  font-size: 14px;
  color: var(--ink);
}

.reasoning-item-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}

.reasoning-item-body {
  font-size: 14px;
  color: var(--ink);
  margin-top: 4px;
  line-height: 1.6;
}

.reasoning-item-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  margin-top: 6px;
}

.reasoning-subhead {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 20px;
}

.score-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.score-chip {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.02em;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 2px 7px;
}

.uncertainty-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 1px 7px;
  white-space: nowrap;
}

.cluster-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 16px 0;
}

.cluster-block {
  background: var(--paper-dim);
  border: 1px solid var(--line);
  padding: 12px 14px;
}

.cluster-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 8px;
}

.cluster-members {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.cluster-chip {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 2px 8px;
}

.content-badge {
  font-family: var(--font-mono);
  color: var(--muted);
}

/* ---------------- Footer ---------------- */

.page-footer {
  border-top: 1px solid var(--line);
  padding-top: 20px;
  margin-top: 56px;
}

.page-footer p {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  margin: 0;
}

/* ---------------- Motion & accessibility ---------------- */

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

@media (max-width: 520px) {
  .title {
    font-size: 32px;
  }
  .page {
    padding: 40px 18px 64px;
  }
}