:root {
  --bg: #f3efe6;
  --paper: #fffdf8;
  --ink: #1c1a16;
  --muted: #6a645a;
  --line: #d7d0c3;
  --phd: #7db7e8;
  --senior: #f4a261;
  --genai: #66bb6a;
  --accent: #0f4c5c;
  --sidebar: #1c1a16;
  --sidebar-soft: #2a2722;
  --curvature: #5c4d7a;
  --upstream: #0f4c5c;
  --restatement: #8a6a4a;
  --not-addressed: #8a8580;
  --unclear: #9a6b2f;
  --yes: #2f6b4f;
  --no: #9b3d3d;
  --under: #6a645a;
  --phase-w: 11.5rem;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.45;
}

.phase-nav {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--phase-w);
  background: var(--sidebar);
  color: #f5f1e8;
  padding: 1.25rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  z-index: 20;
}

.phase-nav-title {
  margin: 0 0 0.55rem;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #b7b0a4;
}

.phase-btn {
  border: 1px solid transparent;
  background: transparent;
  color: #efeae0;
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  font: inherit;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}

.phase-btn:hover {
  background: var(--sidebar-soft);
}

.phase-btn.is-active {
  background: #fffdf8;
  color: var(--ink);
  font-weight: 600;
}

.app-shell {
  margin-left: var(--phase-w);
  min-width: 0;
}

.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.4rem 1.25rem 1.1rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
}

.eyebrow {
  margin: 0 0 0.25rem;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-family: Literata, Georgia, serif;
  font-weight: 650;
  font-size: 1.7rem;
  letter-spacing: -0.02em;
}

.meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: right;
}

.task-nav {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.9rem 1.25rem 0;
  display: flex;
  gap: 0.5rem;
}

.task-btn,
.group-btn {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font: inherit;
  cursor: pointer;
}

.task-btn.is-active,
.group-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.toolbar {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem 0.4rem;
  display: grid;
  gap: 0.85rem;
}

.group-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.filters label {
  display: grid;
  gap: 0.25rem;
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.filters input,
.filters select {
  min-width: 220px;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
  font: inherit;
  color: var(--ink);
  text-transform: none;
  letter-spacing: 0;
}

.status {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.2rem 1.25rem 0.8rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.theory-list {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
  display: grid;
  gap: 1rem;
}

.theory {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}

.theory-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 0.9rem;
  align-items: center;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  background: #faf7f0;
}

.pid {
  font-weight: 600;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
  font-size: 0.78rem;
  font-weight: 500;
  border: 1px solid transparent;
}

.pill.phd { background: color-mix(in srgb, var(--phd) 28%, white); }
.pill.senior { background: color-mix(in srgb, var(--senior) 32%, white); }
.pill.genai { background: color-mix(in srgb, var(--genai) 28%, white); }
.pill.conf { background: #ece7dc; color: var(--muted); }

.theory-body {
  padding: 1rem;
  display: grid;
  gap: 0.95rem;
}

.block-label {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

.theory-text,
.reconstruction {
  margin: 0;
  white-space: pre-wrap;
  font-size: 0.96rem;
}

.reconstruction {
  color: #2d2a25;
}

.pairs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.pairs-post {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.pair {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem 0.8rem;
  background: #fff;
  min-width: 0;
}

.pair-top {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  align-items: start;
  margin-bottom: 0.55rem;
}

.pair-rank {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pair-features {
  margin: 0.15rem 0 0;
  font-weight: 600;
  font-size: 0.9rem;
  line-height: 1.3;
  word-break: break-word;
}

.sign {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.95rem;
  font-weight: 600;
}

.sign-pos { color: var(--yes); }
.sign-neg { color: var(--no); }

.yn-yes { color: var(--yes); }
.yn-no { color: var(--no); }

.class-badge {
  display: inline-block;
  margin: 0.2rem 0 0.55rem;
  padding: 0.22rem 0.5rem;
  border-radius: 6px;
  font-size: 0.74rem;
  font-weight: 600;
  line-height: 1.25;
  word-break: break-word;
}

.class-badge.terminal_curvature,
.class-badge.mixed_terminal { background: color-mix(in srgb, var(--curvature) 18%, white); color: var(--curvature); }
.class-badge.nonterminal_upstream_interaction { background: color-mix(in srgb, var(--upstream) 16%, white); color: var(--upstream); }
.class-badge.restatement_only { background: color-mix(in srgb, var(--restatement) 18%, white); color: var(--restatement); }
.class-badge.not_addressed { background: #ecebe8; color: var(--not-addressed); }
.class-badge.unclear { background: color-mix(in srgb, var(--unclear) 16%, white); color: var(--unclear); }

.pair-meta {
  display: grid;
  gap: 0.35rem;
  margin: 0 0 0.55rem;
}

.meta-row {
  display: grid;
  grid-template-columns: 8.6rem minmax(0, 1fr);
  gap: 0.4rem;
  align-items: stretch;
}

.meta-q,
.meta-a {
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.28rem 0.45rem;
  font-size: 0.82rem;
  line-height: 1.25;
}

.meta-q {
  color: var(--muted);
  background: #f4f1ea;
  font-weight: 500;
}

.meta-a {
  color: var(--ink);
  background: #fff;
  font-weight: 600;
}

.strong-label {
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.03em;
  text-transform: none;
  font-size: 0.82rem;
}

.evidence {
  margin: 0;
  padding-left: 1rem;
  font-size: 0.8rem;
  color: #4a453c;
}

.evidence li { margin: 0.2rem 0; }

.mech {
  margin-top: 0.45rem;
  font-size: 0.78rem;
  color: var(--muted);
}

.empty {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 980px) {
  .pairs,
  .pairs-post { grid-template-columns: 1fr; }
  .header-inner { flex-direction: column; align-items: start; }
  .meta { text-align: left; }
  .phase-nav {
    position: sticky;
    top: 0;
    width: 100%;
    flex-direction: row;
    align-items: center;
    inset: auto;
    padding: 0.65rem 0.85rem;
  }
  .phase-nav-title { margin: 0 0.4rem 0 0; }
  .app-shell { margin-left: 0; }
}