/* ── Research page — extends ai-news.css ─────────────────────────────────── */

/* ── Tab buttons ─────────────────────────────────────────────────────────── */
.tab-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: .88rem;
  font-weight: 700;
  background: transparent;
  border: 0;
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
}
.tab-btn:hover { color: var(--text); background: rgba(255,255,255,.07); }
.tab-btn.active { color: var(--text); background: rgba(255,255,255,.11); }
.tab-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
.tab-panel { display: block; }
.tab-panel.hidden { display: none !important; }

/* ── Research hero banner ────────────────────────────────────────────────── */
.research-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(32px, 5vw, 64px) clamp(24px, 4vw, 56px);
  margin-bottom: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(124,156,255,.1) 0%, rgba(78,227,193,.06) 100%),
    var(--panel-solid);
}
.research-hero::before {
  content: "";
  position: absolute;
  top: -60px; right: -60px;
  width: 340px; height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124,156,255,.18), transparent 70%);
  pointer-events: none;
}
.rh-eyebrow {
  display: block;
  color: var(--accent-2);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .15em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.rh-h1 {
  font-size: clamp(2rem, 5vw, 3.8rem);
  letter-spacing: -.06em;
  line-height: .95;
  margin-bottom: 16px;
}
.rh-sub {
  color: var(--muted);
  font-size: clamp(.92rem, 1.8vw, 1.02rem);
  line-height: 1.75;
  max-width: 580px;
}
.rh-stats {
  display: flex;
  gap: 32px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.rh-stat { display: flex; flex-direction: column; gap: 4px; }
.rh-stat strong {
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: -.06em;
  line-height: 1;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.rh-stat span {
  color: var(--muted);
  font-size: .76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
}

/* ── Category section ────────────────────────────────────────────────────── */
.cat-section { margin-bottom: 56px; }
.cat-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.cat-icon {
  width: 38px; height: 38px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.cat-icon.llm  { background: rgba(124,156,255,.15); color: var(--accent); }
.cat-icon.code { background: rgba(78,227,193,.15);  color: var(--accent-2); }
.cat-icon.prod { background: rgba(255,209,102,.15); color: var(--warning); }
.cat-title { font-size: 1.6rem; font-weight: 900; letter-spacing: -.05em; }
.cat-desc  { color: var(--muted); font-size: .88rem; margin-left: auto; }

/* ── Tool grid ───────────────────────────────────────────────────────────── */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
  align-items: start;
}

/* ── Tool card ───────────────────────────────────────────────────────────── */
.tool-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
  backdrop-filter: blur(16px);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}
.tool-card:hover { border-color: rgba(255,255,255,.18); transform: translateY(-2px); }

.tool-card-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--line);
}
.tool-logo {
  width: 48px; height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.tool-logo img, .tool-logo svg { display: block; }
/* Tool logo colour variants */
.logo-chatgpt    { background: rgba(205, 250, 238, 0.83);  color: #fdffff; }
.logo-claude     { background: rgba(217,119,6,.15);   color: #d97706; }
.logo-gemini     { background: rgba(66,133,244,.15);  color: #4285f4; }
.logo-perplexity { background: rgba(168,85,247,.15);  color: #a855f7; }
.logo-copilot    { background: rgba(99,102,241,.15);  color: #6366f1; }
.logo-cursor     { background: rgba(14,165,233,.15);  color: #0ea5e9; }
.logo-ccode      { background: rgba(245,158,11,.15);  color: #f59e0b; }
.logo-notion     { background: rgba(255,255,255,.1);  color: var(--text); }
.logo-m365       { background: rgba(0,120,212,.15);   color: #0078d4; }
.logo-autogpt    { background: rgba(239,68,68,.15);   color: #ef4444; }

.tool-meta { flex: 1; min-width: 0; }
.tool-name    { font-size: 1.08rem; font-weight: 800; letter-spacing: -.04em; margin-bottom: 3px; }
.tool-tagline { color: var(--muted); font-size: .82rem; line-height: 1.4; }
.tool-tags    { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.tool-tag {
  padding: 3px 8px;
  border-radius: 6px;
  font-size: .66rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  background: rgba(255,255,255,.07);
  color: var(--muted);
  border: 1px solid var(--line);
}

.tool-body { padding: 16px 20px 20px; }

/* ── Feature list ────────────────────────────────────────────────────────── */
.feat-list {
  list-style: none;
  padding: 0;
  margin: 0 0 14px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.feat-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: .875rem;
}
.feat-icon {
  width: 18px; height: 18px;
  border-radius: 5px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  margin-top: 1px;
  font-size: .68rem;
}
.feat-icon.check { background: rgba(78,227,193,.13);  color: var(--accent-2); }
.feat-icon.star  { background: rgba(255,209,102,.13); color: var(--warning); }
.feat-text { flex: 1; color: var(--text-soft); line-height: 1.45; }
.feat-text strong { color: var(--text); }
.feat-gem {
  flex-shrink: 0;
  padding: 2px 7px;
  border-radius: 5px;
  font-size: .63rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .05em;
  background: rgba(255,209,102,.12);
  color: var(--warning);
  border: 1px solid rgba(255,209,102,.22);
}

/* ── Expand / collapse (hidden features) ─────────────────────────────────── */
.expand-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,.04);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: .82rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.expand-toggle:hover {
  background: rgba(255,255,255,.08);
  color: var(--text);
  border-color: var(--line-strong);
}
.expand-toggle .chevron { transition: transform .25s ease; flex-shrink: 0; }
.expand-toggle[aria-expanded="true"] .chevron { transform: rotate(180deg); }

.expand-panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height .38s cubic-bezier(.4,0,.2,1);
}
.expand-panel.open { max-height: 1800px; }
.expand-panel-inner { padding: 16px 0 2px; }

.hidden-feat-heading {
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--warning);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.pro-tip-box {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(124,156,255,.07);
  border: 1px solid rgba(124,156,255,.18);
  font-size: .84rem;
  color: var(--text-soft);
  line-height: 1.6;
  margin-top: 12px;
}
.pro-tip-box strong { color: var(--accent); }

/* ── Prompt Engineering Course layout ───────────────────────────────────── */
.course-hero {
  padding: clamp(24px, 4vw, 48px);
  margin-bottom: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(78,227,193,.09) 0%, rgba(124,156,255,.07) 100%),
    var(--panel-solid);
}
.course-hero-eyebrow {
  display: block;
  color: var(--accent);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .15em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.course-hero h2 {
  font-size: clamp(1.9rem, 4vw, 3.2rem);
  letter-spacing: -.07em;
  line-height: .95;
  margin-bottom: 12px;
}
.course-hero p {
  color: var(--muted);
  font-size: .95rem;
  line-height: 1.75;
  max-width: 560px;
}
.course-progress-wrap { margin-top: 20px; }
.course-progress-bar  {
  height: 3px;
  background: var(--line);
  border-radius: 2px;
  margin-bottom: 6px;
  overflow: hidden;
}
.course-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 2px;
  transition: width .4s ease;
}
.course-progress-label {
  font-size: .72rem;
  color: var(--muted);
  font-weight: 600;
}

.course-layout {
  display: block;
}

/* ── Chapters toggle button (inside each ch-header) ──────────────────────── */
.chapters-toggle-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: rgba(255,255,255,.06);
  color: var(--text);
  font-size: .78rem;
  font-weight: 700;
  cursor: pointer;
  z-index: 10;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.chapters-toggle-btn::before {
  content: "☰";
  font-size: .8rem;
}
.chapters-toggle-btn:hover {
  background: rgba(124,156,255,.12);
  border-color: rgba(124,156,255,.35);
  color: var(--accent);
}

/* ── Chapters dropdown ───────────────────────────────────────────────────── */
.chapters-dropdown {
  position: fixed;
  top: 0;
  right: 0;
  width: 264px;
  max-width: calc(100vw - 48px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  box-shadow: 0 16px 56px rgba(0,0,0,.65);
  z-index: 600;
  overflow: hidden;
  display: none;
  transform-origin: top right;
  animation: dropdownIn .14s ease;
}
.chapters-dropdown.open { display: block; }
@keyframes dropdownIn {
  from { opacity: 0; transform: scale(.96) translateY(-6px); }
  to   { opacity: 1; transform: scale(1)  translateY(0);     }
}

/* ── Chapter dropdown header ─────────────────────────────────────────────── */
.csb-head {
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--line);
}
.csb-label {
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 3px;
}
.csb-title { font-size: .95rem; font-weight: 800; letter-spacing: -.03em; }
.chapter-nav {
  list-style: none;
  padding: 8px 6px;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  max-height: calc(100vh - 260px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(124,156,255,.3) transparent;
}
.chapter-nav::-webkit-scrollbar { width: 3px; }
.chapter-nav::-webkit-scrollbar-thumb { background: rgba(124,156,255,.3); border-radius: 2px; }
.chapter-nav-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  border-radius: 9px;
  color: var(--muted);
  font-size: .82rem;
  font-weight: 600;
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: left;
  transition: background var(--transition), color var(--transition);
}
.chapter-nav-btn:hover { background: rgba(255,255,255,.06); color: var(--text); }
.chapter-nav-btn.active { background: rgba(124,156,255,.12); color: var(--accent); }
.ch-num {
  width: 22px; height: 22px;
  border-radius: 7px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  font-size: .7rem;
  font-weight: 900;
  background: rgba(255,255,255,.07);
  color: var(--muted);
}
.chapter-nav-btn.active .ch-num { background: rgba(124,156,255,.2); color: var(--accent); }

/* ── Chapter panels ──────────────────────────────────────────────────────── */
.course-layout > main { width: 100%; }
.chapter-panel { display: none; }
.chapter-panel.active { display: block; }

.ch-header {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3.5vw, 40px) clamp(140px, 14vw, 160px) clamp(22px, 3.5vw, 40px) clamp(22px, 3.5vw, 44px);
  margin-bottom: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(124,156,255,.09) 0%, rgba(78,227,193,.05) 100%),
    var(--panel-solid);
}
.ch-eyebrow {
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 8px;
}
.ch-title {
  font-size: clamp(1.7rem, 3.5vw, 2.6rem);
  letter-spacing: -.07em;
  line-height: 1;
  margin-bottom: 10px;
}
.ch-intro {
  color: var(--muted);
  font-size: .92rem;
  line-height: 1.78;
  max-width: 580px;
}

/* Content blocks */
.cb { margin-bottom: 28px; }
.cb-h2 {
  font-size: 1.18rem;
  font-weight: 800;
  letter-spacing: -.04em;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.cb-h2::before {
  content: "";
  display: block;
  width: 3px; height: 1.1em;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-2));
  flex-shrink: 0;
}
.cb-p {
  color: var(--text-soft);
  line-height: 1.82;
  font-size: .93rem;
  margin-bottom: 10px;
}

/* concept grid */
.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin: 14px 0;
}
.concept-card {
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.03);
}
.cc-num {
  font-size: .68rem;
  font-weight: 900;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 5px;
}
.cc-title { font-size: .9rem; font-weight: 800; letter-spacing: -.03em; margin-bottom: 5px; }
.cc-desc { color: var(--muted); font-size: .8rem; line-height: 1.5; }

/* ── Prompt comparison boxes ─────────────────────────────────────────────── */
.prompt-compare {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0;
}
.cmp-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(8,11,19,.7);
}
.cmp-card.bad  { border-color: rgba(255,107,139,.3); }
.cmp-card.good { border-color: rgba(255,209,102,.3); }
.cmp-card.pro  { border-color: rgba(78,227,193,.3); }
.cmp-head {
  padding: 9px 14px;
  font-size: .7rem;
  font-weight: 900;
  letter-spacing: .1em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 7px;
}
.cmp-card.bad  .cmp-head { background: rgba(255,107,139,.1); color: var(--danger); }
.cmp-card.good .cmp-head { background: rgba(255,209,102,.1); color: var(--warning); }
.cmp-card.pro  .cmp-head { background: rgba(78,227,193,.1);  color: var(--accent-2); }
.cmp-body { padding: 14px; }
.prompt-text {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: .76rem;
  line-height: 1.65;
  color: var(--text-soft);
  background: rgba(0,0,0,.35);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 10px;
  white-space: pre-wrap;
  word-break: break-word;
}
.cmp-note {
  font-size: .78rem;
  line-height: 1.5;
}
.cmp-card.bad  .cmp-note { color: rgba(255,107,139,.75); }
.cmp-card.good .cmp-note { color: rgba(255,209,102,.75); }
.cmp-card.pro  .cmp-note { color: rgba(78,227,193,.75); }

/* ── Anatomy diagram ─────────────────────────────────────────────────────── */
.anatomy-diagram {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
  margin: 16px 0;
}
.anatomy-row {
  display: flex;
  align-items: stretch;
  min-height: 50px;
  border-bottom: 1px solid var(--line);
}
.anatomy-row:last-child { border-bottom: 0; }
.anatomy-row:nth-child(even) { background: rgba(255,255,255,.02); }
.anatomy-lbl {
  width: 130px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  padding: 10px 14px;
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  border-right: 1px solid var(--line);
}
.anatomy-val {
  flex: 1;
  padding: 10px 14px;
  font-size: .86rem;
  color: var(--text-soft);
  line-height: 1.5;
  display: flex;
  align-items: center;
}
.ar-role        .anatomy-lbl { color: var(--accent); }
.ar-context     .anatomy-lbl { color: var(--accent-2); }
.ar-task        .anatomy-lbl { color: var(--warning); }
.ar-format      .anatomy-lbl { color: var(--c-policy); }
.ar-constraints .anatomy-lbl { color: var(--danger); }
.ar-examples    .anatomy-lbl { color: var(--c-trending); }

/* ── Code block ──────────────────────────────────────────────────────────── */
.code-block {
  background: #080c17;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 14px 0;
}
.code-block-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--line);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.code-lang-dot { width: 8px; height: 8px; border-radius: 50%; }
.code-block pre {
  padding: 16px;
  margin: 0;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: .82rem;
  line-height: 1.72;
  color: var(--text-soft);
  overflow-x: visible;
  white-space: pre-wrap;
  word-break: break-word;
  tab-size: 2;
}
.hl-role    { color: var(--accent); }
.hl-context { color: var(--accent-2); }
.hl-task    { color: var(--warning); }
.hl-format  { color: #a78bfa; }
.hl-comment { color: var(--muted-2); font-style: italic; }
.hl-key     { color: #f472b6; }

/* ── Callout boxes ───────────────────────────────────────────────────────── */
.callout {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  margin: 14px 0;
  font-size: .88rem;
  line-height: 1.65;
}
.callout-icon { font-size: 1.05rem; flex-shrink: 0; margin-top: 1px; }
.callout-body { flex: 1; color: var(--text-soft); }
.callout-body strong { display: block; margin-bottom: 3px; }
.callout.tip  { background: rgba(78,227,193,.07);  border: 1px solid rgba(78,227,193,.2); }
.callout.tip  .callout-icon,
.callout.tip  strong { color: var(--accent-2); }
.callout.warn { background: rgba(255,209,102,.07); border: 1px solid rgba(255,209,102,.2); }
.callout.warn .callout-icon,
.callout.warn strong { color: var(--warning); }
.callout.info { background: rgba(124,156,255,.07); border: 1px solid rgba(124,156,255,.2); }
.callout.info .callout-icon,
.callout.info strong { color: var(--accent); }

/* ── Technique cards (advanced chapter) ─────────────────────────────────── */
.technique-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  margin: 14px 0;
}
.technique-card {
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.03);
  transition: border-color var(--transition), transform var(--transition);
}
.technique-card:hover { border-color: rgba(255,255,255,.16); transform: translateY(-2px); }
.tc-name  { font-size: .98rem; font-weight: 800; letter-spacing: -.03em; margin-bottom: 6px; }
.tc-desc  { font-size: .82rem; color: var(--muted); line-height: 1.55; margin-bottom: 12px; }
.tc-ex {
  font-family: 'JetBrains Mono', monospace;
  font-size: .74rem;
  background: rgba(0,0,0,.3);
  border-radius: 7px;
  padding: 10px 12px;
  color: var(--text-soft);
  line-height: 1.6;
  border: 1px solid var(--line);
}
.tc-level {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: 5px;
  margin-top: 10px;
  font-size: .66rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .06em;
}
.lv-b { background: rgba(78,227,193,.12);  color: var(--accent-2); }
.lv-i { background: rgba(255,209,102,.12); color: var(--warning); }
.lv-a { background: rgba(255,107,139,.12); color: var(--danger); }

/* ── Shot example (few-shot display) ─────────────────────────────────────── */
.shot-box {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 12px 0;
}
.shot-row {
  display: grid;
  grid-template-columns: 70px 1fr;
  border-bottom: 1px solid var(--line);
}
.shot-row:last-child { border-bottom: 0; }
.shot-role {
  padding: 9px 12px;
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  border-right: 1px solid var(--line);
}
.shot-role.u { color: var(--accent);   background: rgba(124,156,255,.07); }
.shot-role.a { color: var(--accent-2); background: rgba(78,227,193,.06); }
.shot-content {
  padding: 9px 14px;
  font-size: .83rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-soft);
  line-height: 1.6;
  white-space: pre-wrap;
}

/* full-width label strip for domain-example shot-boxes */
.shot-strip {
  padding: 6px 14px;
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line);
}
.shot-strip.u { color: var(--accent);   background: rgba(124,156,255,.07); }
.shot-strip.a { color: var(--accent-2); background: rgba(78,227,193,.06); }
.shot-row--full { grid-template-columns: 1fr; }

/* ── Chapter footer nav ──────────────────────────────────────────────────── */
.ch-nav-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.ch-nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: var(--text-soft);
  font-size: .88rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.ch-nav-btn:hover { background: rgba(255,255,255,.09); border-color: var(--line-strong); color: var(--text); }
.ch-nav-btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: #06101d;
}
.ch-nav-btn.primary:hover { opacity: .91; }
.ch-nav-btn:disabled { opacity: .3; pointer-events: none; }

/* ── Anti-pattern list ───────────────────────────────────────────────────── */
.antipattern-list {
  list-style: none;
  padding: 0;
  margin: 14px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ap-item {
  display: flex;
  gap: 12px;
  padding: 13px 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,107,139,.2);
  background: rgba(255,107,139,.05);
}
.ap-icon { font-size: 1rem; flex-shrink: 0; }
.ap-body { flex: 1; font-size: .86rem; color: var(--text-soft); line-height: 1.55; }
.ap-body strong { color: var(--danger); display: block; margin-bottom: 2px; }

/* ── Parameter table ─────────────────────────────────────────────────────── */
.param-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .86rem;
  margin: 14px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
}
.param-table th {
  padding: 10px 14px;
  background: rgba(255,255,255,.05);
  color: var(--muted);
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
  text-align: left;
  border-bottom: 1px solid var(--line);
}
.param-table td {
  padding: 10px 14px;
  color: var(--text-soft);
  border-bottom: 1px solid rgba(255,255,255,.05);
  line-height: 1.5;
}
.param-table tr:last-child td { border-bottom: 0; }
.param-table td:first-child { color: var(--accent); font-family: 'JetBrains Mono', monospace; font-size: .8rem; }

/* ── Progression bar ─────────────────────────────────────────────────────── */
.progression-bar {
  display: flex;
  margin: 18px 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line);
}
.prog-step {
  flex: 1;
  padding: 12px 8px;
  text-align: center;
  font-size: .74rem;
  font-weight: 700;
  line-height: 1.3;
  border-right: 1px solid var(--line);
}
.prog-step:last-child { border-right: 0; }
.prog-step span { display: block; font-size: .65rem; font-weight: 600; opacity: .7; margin-top: 3px; }
.ps-1 { background: rgba(255,107,139,.08); color: var(--danger); }
.ps-2 { background: rgba(255,209,102,.08); color: var(--warning); }
.ps-3 { background: rgba(124,156,255,.08); color: var(--accent); }
.ps-4 { background: rgba(78,227,193,.08);  color: var(--accent-2); }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 1000px) {
  .prompt-compare { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .tool-grid      { grid-template-columns: 1fr; }
  .concept-grid   { grid-template-columns: 1fr; }
  .technique-grid { grid-template-columns: 1fr; }
  .rh-stats       { gap: 18px; }
  .anatomy-lbl    { width: 90px; font-size: .65rem; }
  .chapters-dropdown {
    right: 12px;
    left: 12px;
    width: auto;
    max-width: none;
  }
  .chapters-toggle-btn {
    top: 12px;
    right: 12px;
    padding: 6px 10px;
    font-size: .72rem;
  }
}