/* ==========================================================================
   GRAMATICA NESCRISĂ — Dual-Themed High-Contrast Editorial Stylesheet
   Standards: WCAG AAA Contrast, Zero Inline Colors, Fluid Typography
   ========================================================================== */

:root {
  /* Palette: Light Mode (Crisp High-Contrast Ink on Warm Canvas) */
  --bg-canvas: #f8f9fa;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f3f5;
  --bg-surface-subtle: #f4f6f8;
  --bg-badge: #e9ecef;
  
  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;
  --border-focus: #0f172a;
  
  --text-primary: #090d16;      /* WCAG AAA ink */
  --text-secondary: #1e293b;    /* High-contrast body ink */
  --text-muted: #475569;        /* Muted metadata (>= 4.5:1 on white) */
  
  --accent-primary: #881337;    /* Deep carmine / wax seal burgundy */
  --accent-surface: #ffe4e6;
  --accent-hover: #4c0519;
  
  --accent-secondary: #0f766e;  /* Deep spruce teal */
  --accent-sec-surface: #ccfbf1;
  
  --badge-warning: #9a3412;     /* Rust warning */
  --badge-warning-bg: #ffedd5;
  
  --badge-critical: #991b1b;    /* Crimson critical */
  --badge-critical-bg: #fee2e2;

  --badge-success: #166534;
  --badge-success-bg: #dcfce7;
  
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.12);
  
  --font-serif: "Spectral", "Fraunces", Georgia, serif;
  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", Menlo, Consolas, monospace;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;

  --container-max: 1200px;
}

[data-theme="dark"] {
  /* Palette: Dark Mode (Crisp Paper Ink on Deep Basalt) */
  --bg-canvas: #090d16;
  --bg-surface: #131b2e;
  --bg-surface-elevated: #1a243b;
  --bg-surface-subtle: #162035;
  --bg-badge: #23314e;
  
  --border-subtle: #25334d;
  --border-strong: #3b4d70;
  --border-focus: #f8fafc;
  
  --text-primary: #f8fafc;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;
  
  --accent-primary: #fda4af;    /* Warm luminous rose */
  --accent-surface: #4c0519;
  --accent-hover: #fecdd3;
  
  --accent-secondary: #5eead4;  /* Luminous spruce */
  --accent-sec-surface: #115e59;
  
  --badge-warning: #fdba74;
  --badge-warning-bg: #431407;
  
  --badge-critical: #fca5a5;
  --badge-critical-bg: #450a0a;

  --badge-success: #86efac;
  --badge-success-bg: #052e16;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.5);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--text-primary);
  color: var(--bg-surface);
  padding: 10px 18px;
  z-index: 1000;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
  text-decoration: none;
}

.skip-link:focus {
  top: 15px;
}

/* Global Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* Header & Navigation Bar */
.site-header {
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand-badge .pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  background: var(--bg-badge);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  font-weight: 600;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-control {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.btn-control:hover, .btn-control:focus-visible {
  border-color: var(--border-strong);
  background: var(--bg-badge);
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Section Navigation Strip */
.nav-strip {
  background: var(--bg-surface-subtle);
  border-bottom: 1px solid var(--border-subtle);
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

.nav-strip-inner {
  display: flex;
  gap: 8px;
  padding: 8px 0;
}

.nav-strip a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background-color 0.15s;
}

.nav-strip a:hover, .nav-strip a:focus {
  color: var(--text-primary);
  background: var(--bg-surface);
}

/* Hero Section */
.hero-section {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-canvas) 100%);
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--accent-primary);
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 4.5vw, 3.8rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 960px;
  margin-bottom: 24px;
}

.hero-standfirst {
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 860px;
  margin-bottom: 32px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-muted);
}

.hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero-meta-item strong {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

/* Executive Findings Grid */
.executive-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-head {
  margin-bottom: 36px;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 760px;
  margin-top: 8px;
}

.findings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.finding-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.finding-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.finding-number {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: 12px;
}

.finding-card h3 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 14px;
}

.finding-thesis {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
}

.finding-mechanism {
  font-size: 0.88rem;
  color: var(--text-muted);
  background: var(--bg-surface-subtle);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-primary);
  line-height: 1.55;
  margin-top: auto;
}

/* Field Guide: Rules Taxonomy */
.rules-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.rules-controls {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.search-row {
  display: flex;
  gap: 12px;
}

.search-input {
  flex: 1;
  background: var(--bg-canvas);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 0.95rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
}

.search-input:focus {
  outline: 2px solid var(--border-focus);
  outline-offset: 1px;
}

.sphere-filter-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sphere-pill {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: var(--font-sans);
}

.sphere-pill:hover, .sphere-pill:focus-visible {
  background: var(--bg-badge);
  border-color: var(--border-strong);
}

.sphere-pill.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.rules-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 20px;
}

.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 24px;
}

.rule-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.rule-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.rule-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.rule-sphere-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--bg-surface-elevated);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.rule-friction-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
}

.friction-critical {
  background: var(--badge-critical-bg);
  color: var(--badge-critical);
}

.friction-high {
  background: var(--badge-warning-bg);
  color: var(--badge-warning);
}

.friction-moderate {
  background: var(--accent-sec-surface);
  color: var(--accent-secondary);
}

.friction-low {
  background: var(--bg-badge);
  color: var(--text-muted);
}

.rule-card h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 12px;
}

.rule-formula {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--accent-primary);
  background: var(--accent-surface);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  line-height: 1.45;
}

.rule-row {
  margin-bottom: 12px;
  font-size: 0.92rem;
}

.rule-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  display: block;
  margin-bottom: 2px;
  font-weight: 600;
}

.rule-theory {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  background: var(--bg-surface-subtle);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  margin-top: auto;
}

/* Simulator Section */
.simulator-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}

.simulator-box {
  background: var(--bg-canvas);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.scenario-selector-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 16px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.scenario-tab-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  font-family: var(--font-sans);
  transition: all 0.15s ease;
}

.scenario-tab-btn:hover {
  border-color: var(--border-strong);
}

.scenario-tab-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.scenario-display {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 860px) {
  .scenario-display {
    grid-template-columns: 1fr;
  }
}

.scenario-briefing {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.scenario-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  color: var(--accent-primary);
  font-weight: 700;
}

.scenario-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
}

.scenario-context {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
  background: var(--bg-surface);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--accent-secondary);
}

.scenario-options-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.scenario-opt-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.scenario-opt-btn:hover {
  border-color: var(--border-strong);
  background: var(--bg-surface-elevated);
}

.scenario-opt-btn.active {
  border-color: var(--accent-primary);
  background: var(--accent-surface);
  outline: 2px solid var(--accent-primary);
}

.opt-btn-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--text-muted);
  display: block;
  margin-bottom: 4px;
}

.opt-btn-text {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.simulator-result-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.meter-wrapper {
  margin-bottom: 24px;
}

.meter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.meter-bar {
  height: 12px;
  background: var(--bg-badge);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}

.meter-fill {
  height: 100%;
  border-radius: var(--radius-pill);
  transition: width 0.4s ease, background-color 0.4s ease;
}

.result-audience-box {
  background: var(--bg-surface-subtle);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 16px;
}

.result-verdict-box {
  background: var(--bg-surface-elevated);
  border-left: 4px solid var(--border-strong);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
}

/* Comparative Matrix */
.comparative-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.comparative-table-wrapper {
  overflow-x: auto;
  margin-top: 24px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
}

.comp-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  text-align: left;
}

.comp-table th {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
}

.comp-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: top;
  line-height: 1.55;
}

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

.comp-table td strong {
  color: var(--text-primary);
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-serif);
  font-size: 1.05rem;
}

/* Treatises / Monographs Section */
.treatises-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-canvas);
}

.treatise-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 36px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

.treatise-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 20px;
  margin-bottom: 24px;
}

.treatise-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 8px;
}

.treatise-abstract {
  font-style: italic;
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.treatise-body p {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.treatise-body p:last-child {
  margin-bottom: 0;
}

/* Lexicon Section */
.lexicon-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.lexicon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 28px;
}

.lexicon-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
}

.lexicon-phrase {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: 4px;
}

.lexicon-literal {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.lexicon-subtext {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Canonical Footer */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 32px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.footer-brand h4 {
  font-family: var(--font-serif);
  color: var(--text-primary);
  font-size: 1.2rem;
  margin-bottom: 6px;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.15s;
}

.footer-links a:hover, .footer-links a:focus {
  color: var(--accent-primary);
  text-decoration: underline;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8rem;
}

/* Responsive Breakpoints */
@media (max-width: 640px) {
  .hero-section {
    padding: 40px 0 32px;
  }
  .rules-grid, .findings-grid, .lexicon-grid {
    grid-template-columns: 1fr;
  }
  .simulator-box {
    padding: 20px;
  }
  .treatise-card {
    padding: 24px;
  }
}