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

.page-header .label { margin-bottom: 16px; }

.page-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 12px;
}

.page-desc {
  font-size: 15px;
  color: var(--text-dim);
  max-width: 480px;
  line-height: 1.65;
}

/* ── Filter bar ───────────────────────────────────── */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.filter-btn {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-dimmer);
  border: 1px solid var(--border);
  padding: 4px 12px;
  background: none;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.filter-btn:hover,
.filter-btn.active {
  color: var(--accent);
  border-color: var(--accent-border);
  background: var(--accent-dim);
}

/* ── Experiment list ──────────────────────────────── */
.exp-list {
  padding: 48px 0;
}

.exp-list-item {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: 0 24px;
  align-items: start;
  padding: 28px 0;
  border-bottom: 1px solid var(--border-dim);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
}

.exp-list-item:last-child { border-bottom: none; }
.exp-list-item:hover .exp-list-title { color: var(--accent); }

.exp-list-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dimmer);
  padding-top: 4px;
}

.exp-list-body {}

.exp-list-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
  transition: color 0.15s;
}

.exp-list-summary {
  font-size: 13.5px;
  color: var(--text-dim);
  line-height: 1.6;
  max-width: 520px;
  margin-bottom: 12px;
}

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

.exp-list-meta {
  text-align: right;
  flex-shrink: 0;
}

.exp-list-date {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dimmer);
  display: block;
  margin-bottom: 6px;
}

.exp-list-status {
  font-family: var(--mono);
  font-size: 10px;
  padding: 2px 7px;
  display: inline-block;
}

.status-complete {
  color: var(--green);
  border: 1px solid rgba(34, 197, 94, 0.25);
}

.status-soon {
  color: var(--text-dimmer);
  border: 1px solid var(--border);
}

.status-ongoing {
  color: var(--orange);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

/* ── Playbook list ────────────────────────────────── */
.playbook-list {
  padding: 48px 0;
}

.playbook-item {
  display: block;
  padding: 28px 0;
  border-bottom: 1px solid var(--border-dim);
  text-decoration: none;
  color: inherit;
}

.playbook-item:last-child { border-bottom: none; }
.playbook-item:hover .playbook-title { color: var(--accent); }

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

.playbook-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  transition: color 0.15s;
}

.playbook-summary {
  font-size: 13.5px;
  color: var(--text-dim);
  line-height: 1.6;
  max-width: 560px;
}

.playbook-difficulty {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dimmer);
  border: 1px solid var(--border);
  padding: 2px 7px;
}

/* ── About page ───────────────────────────────────── */
.about-section {
  padding: 56px 0;
  border-top: 1px solid var(--border);
  max-width: 640px;
}

.about-section:first-of-type { border-top: none; }

.about-section h2 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-dimmer);
  font-family: var(--mono);
  margin-bottom: 24px;
  text-transform: uppercase;
}

.about-section p {
  font-size: 15.5px;
  color: var(--text-dim);
  line-height: 1.75;
  margin-bottom: 16px;
}

.about-section p:last-child { margin-bottom: 0; }
.about-section strong { color: var(--text); font-weight: 600; }

.about-stack {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.about-stack li {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 4px 10px;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 10px 16px;
  margin-top: 8px;
  transition: color 0.15s, border-color 0.15s;
}

.contact-link:hover { color: var(--accent); border-color: var(--accent-border); }

/* ── Contact form ─────────────────────────────────── */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 480px;
  margin-top: 8px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dimmer);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.form-input,
.form-textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  padding: 10px 14px;
  outline: none;
  transition: border-color 0.15s;
  -webkit-appearance: none;
  width: 100%;
}

.form-input::placeholder,
.form-textarea::placeholder { color: var(--text-dimmer); }

.form-input:focus,
.form-textarea:focus { border-color: var(--accent); }

.form-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
  font-family: var(--sans);
}

.form-submit {
  font-family: var(--mono);
  font-size: 12.5px;
  background: var(--text);
  color: var(--bg);
  border: none;
  padding: 11px 24px;
  cursor: pointer;
  align-self: flex-start;
  transition: opacity 0.15s;
}

.form-submit:hover:not(:disabled) { opacity: 0.85; }
.form-submit:disabled { opacity: 0.4; cursor: not-allowed; }

.form-status {
  font-family: var(--mono);
  font-size: 12px;
  min-height: 18px;
}

.form-status.ok  { color: var(--green); }
.form-status.err { color: var(--red); }

/* ── Responsive ───────────────────────────────────── */
@media (max-width: 600px) {
  .exp-list-item { grid-template-columns: 32px 1fr; }
  .exp-list-meta { display: none; }
  .page-header { padding: 40px 0 32px; }
}