/* ============================================================
   Humans+ Components
   ============================================================ */

/* ---------- Top navigation ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--surface-base) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-subtle);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 68px;
}
.brand { display: inline-flex; align-items: center; gap: var(--space-3); text-decoration: none; color: var(--text-primary); }
.brand:hover { text-decoration: none; color: var(--text-primary); }
.brand-mark { width: 34px; height: 34px; flex-shrink: 0; }
.brand-name { font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; }
.brand-name .plus { color: var(--brand-primary); }

.nav-links { display: none; align-items: center; gap: var(--space-2); }
.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.5rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
}
.nav-links a:hover { color: var(--text-primary); background: var(--surface-sunken); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--brand-primary); font-weight: 600; }

.nav-actions { display: flex; align-items: center; gap: var(--space-3); }
.nav-cta { display: none; }
@media (min-width: 1024px) {
  .nav-links { display: flex; }
  .nav-cta { display: inline-flex; }
}

/* Theme toggle */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--surface-raised);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-pill);
  padding: 0.35rem;
  min-height: 44px;
  cursor: pointer;
  color: var(--text-secondary);
}
.theme-toggle:hover { border-color: var(--line-strong); color: var(--text-primary); }
.theme-toggle .tt-icon { width: 20px; height: 20px; display: grid; place-items: center; }
.theme-toggle .tt-label { font-size: 0.82rem; font-weight: 600; padding-right: 0.2rem; }

/* Mobile menu */
.nav-burger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  background: none;
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-primary);
}
@media (min-width: 1024px) { .nav-burger { display: none; } }

.mobile-menu {
  display: none;
  border-top: 1px solid var(--line-subtle);
  background: var(--surface-raised);
  padding: var(--space-4) var(--space-5) var(--space-6);
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line-subtle);
  color: var(--text-primary);
  font-weight: 500;
}
.mobile-menu a:last-of-type { border-bottom: 0; }
.mobile-menu .btn { margin-top: var(--space-4); width: 100%; }

/* ---------- Hero ---------- */
.hero { padding: var(--space-8) 0; }
.hero-inner { display: grid; gap: var(--space-7); align-items: center; }
@media (min-width: 900px) { .hero-inner { grid-template-columns: 1.05fr 0.95fr; } }
.hero-copy { max-width: 640px; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-5); }
.hero-proof {
  display: flex; flex-wrap: wrap; gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--line-subtle);
}
.proof-item { display: inline-flex; align-items: center; gap: var(--space-2); font-size: 0.9rem; color: var(--text-secondary); }
.proof-item .tick { color: var(--brand-primary); }

/* Continuity field visual */
.continuity-field { position: relative; width: 100%; aspect-ratio: 1 / 0.9; }
.continuity-field svg { width: 100%; height: 100%; }
.field-label {
  position: absolute;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  background: var(--surface-raised);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.6rem;
}

/* ---------- Section headers ---------- */
.section-head { max-width: 760px; margin-bottom: var(--space-7); }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- Feature blocks ---------- */
.feature-block { display: grid; gap: var(--space-6); align-items: center; }
@media (min-width: 900px) { .feature-block { grid-template-columns: 1fr 1fr; } }
.feature-block.reverse > .feature-visual { order: -1; }
@media (min-width: 900px) { .feature-block.reverse > .feature-visual { order: 2; } }
.feature-visual { background: var(--surface-sunken); border: 1px solid var(--line-subtle); border-radius: var(--radius-lg); padding: var(--space-6); }

/* ---------- Continuity loop diagram ---------- */
.loop { display: grid; gap: var(--space-3); }
.loop-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  align-items: start;
  background: var(--surface-raised);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
}
.loop-step .loop-num {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--brand-soft);
  color: var(--brand-primary);
  font-weight: 700;
  font-size: 0.9rem;
}
.loop-step h4 { margin-bottom: 0.2em; }
.loop-step p { margin: 0; color: var(--text-secondary); font-size: 0.95rem; }
.loop-arrow { text-align: center; color: var(--brand-primary); font-size: 1.2rem; line-height: 1; }

/* Interactive loop (tabs) */
.loop-tabs { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-5); }
.loop-tab {
  background: var(--surface-raised);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-pill);
  padding: 0.55rem 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text-secondary);
  min-height: 44px;
}
.loop-tab[aria-selected="true"] { background: var(--brand-primary); color: #fff; border-color: var(--brand-primary); }
[data-theme="dark"] .loop-tab[aria-selected="true"] { color: #06120F; }
.loop-panel { display: none; }
.loop-panel.active { display: block; animation: fadeIn var(--dur-med) var(--ease); }
/* Without JS, show all loop steps as a static list (progressive enhancement) */
html:not(.js) .loop-panel { display: block; }
html:not(.js) .loop-tabs { display: none; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- Memory lifecycle stepper ---------- */
.lifecycle { display: flex; flex-direction: column; gap: var(--space-2); }
@media (min-width: 768px) { .lifecycle { flex-direction: row; align-items: stretch; } }
.lifecycle-step {
  flex: 1;
  background: var(--surface-raised);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  position: relative;
}
.lifecycle-step .lc-state { font-weight: 700; font-size: 0.95rem; }
.lifecycle-step .lc-desc { font-size: 0.85rem; color: var(--text-secondary); margin-top: var(--space-2); }
.lifecycle-step .lc-tag { font-size: 0.72rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; }
.lifecycle-step.candidate { border-top: 3px solid var(--status-caution); }
.lifecycle-step.canonical { border-top: 3px solid var(--status-positive); }
.lifecycle-step.superseded { border-top: 3px solid var(--accent-violet); }
.lifecycle-step.deleted { border-top: 3px solid var(--status-critical); }
.lifecycle-arrow { display: none; align-self: center; color: var(--text-tertiary); }
@media (min-width: 768px) { .lifecycle-arrow { display: block; } }

/* ---------- Comparison ---------- */
.comparison { display: grid; gap: var(--space-4); }
@media (min-width: 900px) { .comparison { grid-template-columns: 1fr 1fr; } }
.comparison-col { background: var(--surface-raised); border: 1px solid var(--line-subtle); border-radius: var(--radius-lg); padding: var(--space-6); }
.comparison-col.humansplus { border-color: var(--brand-primary); box-shadow: var(--shadow-md); }
.comparison-col h3 { display: flex; align-items: center; gap: var(--space-3); }
.comparison-col ul { list-style: none; margin: 0; }
.comparison-col li { display: flex; gap: var(--space-3); margin-bottom: var(--space-3); }
.comparison-col li .mark { flex-shrink: 0; width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font-size: 0.8rem; margin-top: 2px; }
.comparison-col .minus .mark { background: var(--status-critical-soft); color: var(--status-critical); }
.comparison-col .plus .mark { background: var(--status-positive-soft); color: var(--status-positive); }

/* Comparison topic selector */
.topic-tabs { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-5); }
.topic-tab {
  background: var(--surface-raised);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-pill);
  padding: 0.55rem 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text-secondary);
  min-height: 44px;
}
.topic-tab[aria-selected="true"] { background: var(--accent-violet); color: #fff; border-color: var(--accent-violet); }
.topic-panel { display: none; }
.topic-panel.active { display: block; animation: fadeIn var(--dur-med) var(--ease); }
html:not(.js) .topic-panel { display: block; }
html:not(.js) .topic-tabs { display: none; }

/* ---------- Evidence-to-scene flow ---------- */
.e2s { display: flex; flex-direction: column; gap: var(--space-3); }
@media (min-width: 900px) { .e2s { flex-direction: row; align-items: stretch; } }
.e2s-step { flex: 1; background: var(--surface-raised); border: 1px solid var(--line-subtle); border-radius: var(--radius-md); padding: var(--space-4); }
.e2s-step .e2s-title { font-weight: 700; font-size: 0.9rem; margin-bottom: var(--space-2); }
.e2s-step .e2s-body { font-size: 0.85rem; color: var(--text-secondary); }
.e2s-arrow { display: none; align-self: center; color: var(--brand-primary); }
@media (min-width: 900px) { .e2s-arrow { display: block; } }

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: var(--space-6); }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: var(--line-strong); }
.timeline-item { position: relative; margin-bottom: var(--space-5); }
.timeline-item::before {
  content: ""; position: absolute; left: calc(-1 * var(--space-6) + 2px); top: 6px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--brand-primary); border: 3px solid var(--surface-base);
}
.timeline-item h4 { margin-bottom: 0.2em; }
.timeline-item .tl-date { font-size: 0.82rem; color: var(--text-tertiary); }

/* ---------- Resource cards ---------- */
.resource-card { display: flex; flex-direction: column; }
.resource-card .rc-meta { font-size: 0.82rem; color: var(--text-tertiary); margin-top: var(--space-3); }
.resource-card .rc-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }

/* ---------- Filter bar ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; margin-bottom: var(--space-6); }
.filter-bar input[type="search"] {
  flex: 1 1 240px;
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  color: var(--text-primary);
  min-height: 48px;
}
.filter-chip {
  background: var(--surface-raised);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-pill);
  padding: 0.5rem 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text-secondary);
  min-height: 44px;
}
.filter-chip[aria-pressed="true"] { background: var(--brand-primary); color: #fff; border-color: var(--brand-primary); }
[data-theme="dark"] .filter-chip[aria-pressed="true"] { color: #06120F; }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs { display: flex; flex-wrap: wrap; gap: var(--space-2); font-size: 0.85rem; color: var(--text-tertiary); margin-bottom: var(--space-5); }
.breadcrumbs a { color: var(--text-secondary); }
.breadcrumbs .sep { color: var(--line-strong); }

/* ---------- Pagination ---------- */
.pagination { display: flex; gap: var(--space-2); align-items: center; justify-content: center; margin-top: var(--space-6); }
.pagination button {
  min-width: 44px; min-height: 44px;
  border: 1px solid var(--line-subtle);
  background: var(--surface-raised);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  color: var(--text-primary);
}
.pagination button[aria-current="true"] { background: var(--brand-primary); color: #fff; border-color: var(--brand-primary); }
[data-theme="dark"] .pagination button[aria-current="true"] { color: #06120F; }
.pagination button:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- Solution detail ---------- */
.detail-section { max-width: 860px; }
.detail-section h2 { margin-top: var(--space-7); }
.illustrative-note {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-style: italic;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  margin: var(--space-4) 0;
}

/* ---------- Sign-in page ---------- */
.signin-panel {
  max-width: 520px;
  margin: 0 auto;
  background: var(--surface-raised);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-7);
  box-shadow: var(--shadow-md);
}

/* ---------- AMS constellation ---------- */
.constellation { position: relative; width: 100%; aspect-ratio: 1 / 0.8; }
.constellation svg { width: 100%; height: 100%; }
.const-node {
  position: absolute;
  font-size: 0.72rem;
  color: var(--text-secondary);
  background: var(--surface-raised);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-pill);
  padding: 0.25rem 0.6rem;
}

/* ---------- Status / lifecycle pills ---------- */
.pill { display: inline-flex; align-items: center; gap: var(--space-2); font-size: 0.8rem; font-weight: 600; padding: 0.3rem 0.7rem; border-radius: var(--radius-pill); border: 1px solid var(--line-subtle); }
.pill-positive { color: var(--status-positive); background: var(--status-positive-soft); border-color: var(--status-positive); }
.pill-caution { color: var(--status-caution); background: var(--status-caution-soft); border-color: var(--status-caution); }
.pill-critical { color: var(--status-critical); background: var(--status-critical-soft); border-color: var(--status-critical); }

/* ---------- Footer disclaimer ---------- */
.footer-disclaimer {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  border-left: 3px solid var(--line-strong);
  padding-left: var(--space-4);
  margin-top: var(--space-5);
}

/* ---------- Back to top ---------- */
.back-top {
  position: fixed;
  right: var(--space-5);
  bottom: var(--space-5);
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--brand-primary);
  color: #fff;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-med) var(--ease);
  z-index: 90;
}
.back-top.visible { opacity: 1; pointer-events: auto; }
[data-theme="dark"] .back-top { color: #06120F; }