/* ── Experiment page layout ───────────────────────── */
:root { --width: 720px; --section-gap: 72px; }

/* ── Header ───────────────────────────────────────── */
.exp-header {
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--border);
}

.back-link {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dimmer);
  letter-spacing: 0.04em;
  display: inline-block;
  margin-bottom: 36px;
  transition: color 0.15s;
}
.back-link:hover { color: var(--accent); }

.exp-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.exp-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dimmer);
}

.exp-tags { display: flex; gap: 6px; flex-wrap: wrap; }

.exp-date {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dimmer);
  margin-left: auto;
}

.exp-status {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--green);
  border: 1px solid rgba(34, 197, 94, 0.25);
  padding: 2px 7px;
}

.exp-title {
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 12px;
}

.exp-subtitle {
  font-size: 15px;
  color: var(--text-dim);
  margin-bottom: 32px;
}

/* ── Table of contents ────────────────────────────── */
.toc {
  display: flex;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 11px;
  border: 1px solid var(--border);
}

.toc a {
  color: var(--text-dimmer);
  padding: 8px 14px;
  border-right: 1px solid var(--border);
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}
.toc a:last-child { border-right: none; }
.toc a:hover { color: var(--accent); background: var(--accent-dim); }

/* ── Content sections ─────────────────────────────── */
.exp-section {
  padding: var(--section-gap) 0;
  border-top: 1px solid var(--border);
}

.section-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dimmer);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.section-body {
  font-size: 15.5px;
  color: var(--text-dim);
  line-height: 1.75;
  max-width: 640px;
}

.section-body p + p { margin-top: 16px; }
.section-body strong { color: var(--text); font-weight: 600; }

.section-body code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1px 6px;
  color: var(--accent);
}

/* ── Architecture diagram ─────────────────────────── */
.arch-block {
  background: #0d0d18;
  border: 1px solid var(--border);
  padding: 24px;
  overflow-x: auto;
  margin-bottom: 32px;
}

.arch-block pre {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.65;
  color: #9090b0;
  white-space: pre;
}

/* ── Stack table ──────────────────────────────────── */
.stack-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.stack-table th {
  text-align: left;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--text-dimmer);
  padding: 0 16px 12px 0;
  border-bottom: 1px solid var(--border);
  font-weight: 400;
}

.stack-table td {
  padding: 11px 16px 11px 0;
  border-bottom: 1px solid var(--border-dim);
  vertical-align: top;
  color: var(--text-dim);
}

.stack-table td:first-child {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text);
  white-space: nowrap;
  padding-right: 32px;
}

.stack-table td code {
  font-family: var(--mono);
  font-size: 12.5px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1px 6px;
  color: var(--accent);
}

.stack-table tr:last-child td { border-bottom: none; }

/* ── Implementation steps ─────────────────────────── */
.impl-steps {
  counter-reset: step;
  list-style: none;
  max-width: 640px;
}

.impl-steps li {
  counter-increment: step;
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-dim);
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.7;
}

.impl-steps li:last-child { border-bottom: none; }

.impl-steps li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dimmer);
  padding-top: 4px;
  flex-shrink: 0;
  min-width: 24px;
}

.impl-steps li strong { color: var(--text); }

.impl-steps li code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1px 6px;
  color: var(--accent);
}

/* ── Code block ───────────────────────────────────── */
.code-block {
  background: #0d0d18;
  border: 1px solid var(--border);
  margin-bottom: 20px;
}

.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 20px;
  border-bottom: 1px solid #1e1e30;
}

.code-block-filename {
  font-family: var(--mono);
  font-size: 11px;
  color: #5a5a7a;
  letter-spacing: 0.04em;
}

.copy-btn {
  font-family: var(--mono);
  font-size: 10px;
  color: #5a5a7a;
  background: none;
  border: 1px solid #2a2a40;
  padding: 3px 10px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.copy-btn:hover  { color: var(--accent); border-color: var(--accent-border); }
.copy-btn.copied { color: var(--green);  border-color: rgba(34, 197, 94, 0.25); }

.code-block pre {
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.7;
  padding: 20px 24px;
  overflow-x: auto;
  color: #a0a0c0;
}

/* Syntax colours */
.kw  { color: #a5b4fc; }
.str { color: #86efac; }
.cm  { color: #4a4a6a; }
.fn  { color: #7dd3fc; }
.num { color: #fdba74; }

/* ── Results table ────────────────────────────────── */
.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  margin-bottom: 32px;
}

.results-table th {
  text-align: left;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--text-dimmer);
  padding: 0 16px 12px 0;
  border-bottom: 1px solid var(--border);
  font-weight: 400;
}

.results-table td {
  padding: 11px 16px 11px 0;
  border-bottom: 1px solid var(--border-dim);
  color: var(--text-dim);
  vertical-align: top;
}

.results-table td:first-child {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text);
  white-space: nowrap;
  padding-right: 32px;
}

.results-table td.val-good { color: var(--green);  font-family: var(--mono); font-size: 13px; }
.results-table td.val-note { color: var(--orange); font-family: var(--mono); font-size: 13px; }
.results-table tr:last-child td { border-bottom: none; }

/* ── Incident log ─────────────────────────────────── */
.incident-log {
  background: #0d0d18;
  border: 1px solid var(--border);
  padding: 20px 24px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.75;
  color: #8080a0;
  overflow-x: auto;
}

.incident-log .log-head { color: #6060a0; font-size: 11px; letter-spacing: 0.06em; margin-bottom: 16px; }
.incident-log .log-key  { color: #a5b4fc; }
.incident-log .log-ok   { color: var(--green); }
.incident-log .log-err  { color: var(--red); }
.incident-log .log-dim  { color: #4a4a6a; }

/* ── Edge cases & lessons ─────────────────────────── */
.edge-list, .lesson-list {
  list-style: none;
  max-width: 640px;
}

.edge-list li, .lesson-list li {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border-dim);
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.7;
}

.edge-list li:last-child, .lesson-list li:last-child { border-bottom: none; }

.edge-list li .bullet, .lesson-list li .bullet {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dimmer);
  padding-top: 4px;
  flex-shrink: 0;
}

.edge-list li strong, .lesson-list li strong {
  display: block;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 4px;
}

/* ── Limitations ──────────────────────────────────── */
.limit-list {
  list-style: none;
  max-width: 640px;
  counter-reset: limit;
}

.limit-list li {
  counter-increment: limit;
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border-dim);
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.7;
}

.limit-list li:last-child { border-bottom: none; }

.limit-list li::before {
  content: counter(limit);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dimmer);
  padding-top: 4px;
  flex-shrink: 0;
  min-width: 16px;
}

.limit-list li strong {
  display: block;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 4px;
}

/* ── Page nav ─────────────────────────────────────── */
.exp-page-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 40px 0;
  border-top: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 12px;
}

.page-nav-prev { color: var(--text-dimmer); }

.page-nav-next { color: var(--text-dim); transition: color 0.15s; }
.page-nav-next:hover { color: var(--accent); }
.page-nav-next span { color: var(--text-dimmer); display: block; font-size: 10px; margin-bottom: 4px; }

/* ── Responsive: experiment ───────────────────────── */
@media (max-width: 600px) {
  .exp-date { display: none; }
  .toc a { padding: 8px 10px; font-size: 10px; }
  .stack-table, .results-table { font-size: 12.5px; }
}