/* ═══════════════════════════════════════════════════════════════
   QNFO DESIGN SYSTEM v1.0
   Unified visual language for all QNFO publications (*.qnfo.org)
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* ── Brand Colors ── */
  --qnfo-bg:            #fafaf8;
  --qnfo-text:          #1a1a1a;
  --qnfo-text-light:    #4a4a4a;
  --qnfo-muted:         #6b6b6b;
  --qnfo-border:        #e0ddd5;
  --qnfo-border-light:  #f0ede5;
  --qnfo-card-bg:       #f5f3ee;
  --qnfo-callout-bg:    #f3f1ec;

  /* ── Category Accents ── */
  --qnfo-accent-epistemology:  #8b2f2f;
  --qnfo-accent-design:        #9e5f1f;
  --qnfo-accent-physics:       #2f5e8b;
  --qnfo-accent-language:      #5a7d3a;
  --qnfo-accent-default:       #8b2f2f;

  /* Current publication's accent (override per publication) */
  --qnfo-accent: var(--qnfo-accent-default);

  /* ── Typography ── */
  --qnfo-sans:  "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --qnfo-serif: Georgia, "Times New Roman", Times, serif;
  --qnfo-mono:  "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* ── Layout ── */
  --qnfo-container: 680px;
  --qnfo-padding:   1.5rem;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 17px; scroll-behavior: smooth; }

body {
  font-family: var(--qnfo-serif);
  color: var(--qnfo-text);
  background: var(--qnfo-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ── Container ── */
.qnfo-container {
  max-width: var(--qnfo-container);
  margin: 0 auto;
  padding: 3rem var(--qnfo-padding) 5rem;
}

/* ── Hero ── */
.qnfo-hero {
  text-align: center;
  padding: 2rem 0 2.5rem;
  margin-bottom: 1.5rem;
}

.qnfo-hero h1 {
  font-family: var(--qnfo-sans);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

.qnfo-hero .subtitle {
  font-family: var(--qnfo-sans);
  font-size: 1rem;
  color: var(--qnfo-muted);
  line-height: 1.5;
  max-width: 520px;
  margin: 0 auto 1.2rem;
}

.qnfo-hero .meta {
  font-family: var(--qnfo-sans);
  font-size: 0.8rem;
  color: var(--qnfo-muted);
  margin-bottom: 1rem;
}

.qnfo-hero .meta a { color: var(--qnfo-accent); text-decoration: none; }
.qnfo-hero .meta a:hover { text-decoration: underline; }

/* ── Entity Badge ── */
.qnfo-badge {
  display: inline-block;
  font-family: var(--qnfo-mono);
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--qnfo-accent);
  border: 1.5px solid var(--qnfo-accent);
  padding: 0.25rem 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.qnfo-badge.qwav {
  color: var(--qnfo-accent-physics);
  border-color: var(--qnfo-accent-physics);
}

/* ── TOC ── */
.qnfo-toc {
  background: var(--qnfo-card-bg);
  border: 1px solid var(--qnfo-border);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
}

.qnfo-toc-title {
  font-family: var(--qnfo-sans);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--qnfo-muted);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.qnfo-toc-list {
  list-style: none;
  margin: 0;
  columns: 2;
  column-gap: 2rem;
}

.qnfo-toc-list li {
  margin-bottom: 0.3rem;
  font-family: var(--qnfo-sans);
  font-size: 0.85rem;
}

.qnfo-toc-list a {
  color: var(--qnfo-text-light);
  text-decoration: none;
}

.qnfo-toc-list a:hover { color: var(--qnfo-accent); }

/* ── Abstract ── */
.qnfo-abstract {
  background: var(--qnfo-callout-bg);
  border-left: 4px solid var(--qnfo-accent);
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
  font-size: 0.95rem;
  line-height: 1.7;
}

.qnfo-abstract p { margin: 0; }
.qnfo-abstract p + p { margin-top: 0.75rem; }

/* ── Headings ── */
.qnfo-section h2 {
  font-family: var(--qnfo-sans);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 2.5rem 0 0.75rem;
  letter-spacing: -0.01em;
}

.qnfo-section h2::after {
  content: '';
  display: block;
  width: 2.5rem;
  height: 2px;
  background: var(--qnfo-accent);
  margin-top: 0.5rem;
  opacity: 0.6;
}

.qnfo-section h3 {
  font-family: var(--qnfo-sans);
  font-size: 1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--qnfo-accent);
}

.qnfo-section h4 {
  font-family: var(--qnfo-sans);
  font-size: 0.88rem;
  font-weight: 600;
  margin: 1.2rem 0 0.4rem;
  color: var(--qnfo-text-light);
}

/* ── Body ── */
p {
  margin: 0 0 1rem;
  color: var(--qnfo-text-light);
}

strong { font-weight: 600; color: var(--qnfo-text); }
em { font-style: italic; }

ul, ol { margin: 0 0 1.25rem 1.5rem; }
li { margin-bottom: 0.35rem; color: var(--qnfo-text-light); }

/* ── Links ── */
a { color: var(--qnfo-accent); text-decoration: none; transition: color 0.15s; }
a:hover { text-decoration: underline; }

/* ── Table ── */
.qnfo-table-wrap { overflow-x: auto; margin: 1.5rem 0; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  font-family: var(--qnfo-sans);
  line-height: 1.5;
}

thead th {
  text-align: left;
  padding: 0.6rem 0.8rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--qnfo-muted);
  background: var(--qnfo-card-bg);
  border-bottom: 2px solid var(--qnfo-accent);
}

tbody td {
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--qnfo-border-light);
  vertical-align: top;
  color: var(--qnfo-text-light);
}

tbody tr:nth-child(even) { background: #fdfcf8; }
tbody tr:hover { background: #f7f4ed; }

/* ── Callout ── */
.qnfo-callout {
  background: var(--qnfo-callout-bg);
  border: 1px solid var(--qnfo-border);
  border-left: 4px solid var(--qnfo-accent);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
  font-size: 0.9rem;
  line-height: 1.65;
}

.qnfo-callout-title {
  font-family: var(--qnfo-sans);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--qnfo-accent);
  margin-bottom: 0.6rem;
  font-weight: 700;
}

.qnfo-callout p { margin: 0 0 0.5rem; }
.qnfo-callout p:last-child { margin: 0; }

/* ── Entity Labels ── */
.qnfo-entity-label {
  display: inline-block;
  font-family: var(--qnfo-mono);
  font-size: 0.6rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  vertical-align: middle;
}

.qnfo-entity-label.qnfo-label {
  color: var(--qnfo-accent-default);
  border-color: var(--qnfo-accent-default);
}

.qnfo-entity-label.qwav-label {
  color: var(--qnfo-accent-physics);
  border-color: var(--qnfo-accent-physics);
}

/* ── Footer ── */
.qnfo-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--qnfo-border);
  text-align: center;
  font-family: var(--qnfo-sans);
  font-size: 0.78rem;
  color: var(--qnfo-muted);
  line-height: 1.8;
}

.qnfo-footer p { color: var(--qnfo-muted); margin-bottom: 0.3rem; }
.qnfo-footer a { color: var(--qnfo-accent); }
.qnfo-footer a:hover { text-decoration: underline; }
.qnfo-footer .sep { color: var(--qnfo-border); margin: 0 0.5rem; }

/* ── Section divider ── */
.qnfo-divider {
  border: none;
  border-top: 1px solid var(--qnfo-border);
  margin: 2.5rem 0;
}

/* ── Platform Cards (design-framework publications) ── */
.qnfo-card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin: 1rem 0 1.5rem;
}

.qnfo-card {
  background: var(--qnfo-card-bg);
  border: 1px solid var(--qnfo-border);
  padding: 0.6rem 0.85rem;
  font-family: var(--qnfo-sans);
  font-size: 0.8rem;
  line-height: 1.5;
}

.qnfo-card .card-name {
  font-weight: 600;
  color: var(--qnfo-text);
  margin-bottom: 0.15rem;
}

.qnfo-card .card-desc {
  color: var(--qnfo-muted);
  font-size: 0.75rem;
}

/* ── Numbered Principles ── */
.qnfo-principle-list { margin: 1.5rem 0; }

.qnfo-principle {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--qnfo-border-light);
}

.qnfo-principle:last-child { border-bottom: none; }

.qnfo-principle-num {
  flex-shrink: 0;
  width: 2.2rem;
  height: 2.2rem;
  background: var(--qnfo-accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--qnfo-sans);
  font-size: 0.85rem;
  font-weight: 700;
  margin-top: 0.1rem;
}

.qnfo-principle-body strong {
  display: block;
  font-family: var(--qnfo-sans);
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
  color: var(--qnfo-text);
}

.qnfo-principle-body p { font-size: 0.88rem; margin: 0; }

/* ── Insight quote ── */
.qnfo-insight {
  font-size: 1rem;
  line-height: 1.6;
  text-align: center;
  margin: 2.5rem 0;
  padding: 1.5rem 0;
  font-style: italic;
  border-top: 1px solid var(--qnfo-accent);
  border-bottom: 1px solid var(--qnfo-accent);
  opacity: 0.85;
}

/* ── Blueprint section ── */
.qnfo-blueprint {
  background: var(--qnfo-card-bg);
  border: 1px solid var(--qnfo-border);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.qnfo-blueprint ul, .qnfo-blueprint ol { margin-bottom: 0; }
.qnfo-blueprint li:last-child { margin-bottom: 0; }

/* ── Responsive ── */
@media (max-width: 768px) {
  html { font-size: 16px; }
  .qnfo-hero h1 { font-size: 1.7rem; }
  .qnfo-container { padding: 2rem 1rem 3rem; }
  .qnfo-card-grid { grid-template-columns: 1fr; }
  .qnfo-toc-list { columns: 1; }
}

/* ═══════════════════════════════════════════════════════════════
   QWAV APP TOKENS (for *.qwav.tech interactive applications)
   ═══════════════════════════════════════════════════════════════ */

[data-brand="qwav"] {
  --qnfo-bg:            #0d1117;
  --qnfo-text:          #c9d1d7;
  --qnfo-text-light:    #8b949e;
  --qnfo-muted:         #6e7681;
  --qnfo-border:        #30363d;
  --qnfo-border-light:  #21262d;
  --qnfo-card-bg:       #161b22;
  --qnfo-callout-bg:    #161b22;
  --qnfo-accent:        #58a6ff;
}