/* Untul și Margarina — Termodinamica de pe limbă și din sânge */
/* Visual System: Atelier de Patiserie & Cristalografie Lipidică */

:root {
  --bg: #fbf8f3;
  --bg-alt: #f4eee1;
  --surface: #ffffff;
  --surface-warm: #fcfaf5;
  --border: #e6dcce;
  --border-subtle: #efe7db;
  --ink: #1a1510;
  --ink-soft: #544b41;
  --ink-faint: #8a7f72;
  --butter: #d97706;
  --butter-hover: #b45309;
  --butter-bg: #fef3c7;
  --butter-border: #fde68a;
  --margarine: #2563eb;
  --margarine-hover: #1d4ed8;
  --margarine-bg: #eff6ff;
  --margarine-border: #bfdbfe;
  --olive: #15803d;
  --olive-bg: #f0fdf4;
  --olive-border: #bbf7d0;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, Menlo, Monaco, monospace;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(26, 21, 16, 0.05);
  --shadow-md: 0 4px 14px rgba(26, 21, 16, 0.07);
  --shadow-lg: 0 10px 30px rgba(26, 21, 16, 0.09);
  --max-w-prose: 740px;
  --max-w-wide: 1080px;
}

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

html {
  font-size: 17px;
  line-height: 1.65;
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Topbar */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  max-width: var(--max-w-wide);
  margin: 0 auto;
  width: 100%;
  border-bottom: 1px solid var(--border-subtle);
}

.topbar .brand {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
}

.topbar .brand:hover {
  color: var(--ink);
}

.langsw {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.langsw a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.25rem 0.45rem;
  border-radius: 4px;
  font-weight: 500;
  transition: all 0.15s ease;
}

.langsw a[aria-current="page"] {
  background-color: var(--ink);
  color: #ffffff;
  font-weight: 600;
}

.langsw a:hover:not([aria-current="page"]) {
  color: var(--ink);
  background-color: var(--border-subtle);
}

/* Layout */
.shell {
  max-width: var(--max-w-prose);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

.shell-wide {
  max-width: var(--max-w-wide);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Hero */
.hero {
  padding: 4.5rem 0 3rem;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(251, 248, 243, 0) 0%, rgba(244, 238, 225, 0.4) 100%);
}

.kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--butter-deep);
  font-weight: 600;
  margin-bottom: 1.25rem;
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin-bottom: 1.75rem;
}

.standfirst {
  font-size: 1.18rem;
  line-height: 1.6;
  color: var(--ink-soft);
  margin-bottom: 2.75rem;
}

/* Ledger Line */
.ledgerline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  padding: 1.75rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.ledger-item {
  display: flex;
  flex-direction: column;
}

.ledger-item .n {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.2;
  margin-bottom: 0.4rem;
}

.ledger-item .n.butter-c {
  color: var(--butter-deep);
}

.ledger-item .n.danger-c {
  color: var(--danger);
}

.ledger-item .l {
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--ink-soft);
}

/* Prose & Typography */
.block {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.prose h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.3rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin-bottom: 1.5rem;
}

.prose h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--ink);
  margin: 2.25rem 0 0.85rem;
}

.prose p {
  font-size: 1.02rem;
  color: var(--ink);
  margin-bottom: 1.35rem;
}

.prose p.lead {
  font-size: 1.12rem;
  color: var(--ink);
}

.prose strong {
  font-weight: 600;
  color: var(--ink);
}

/* Callout Box */
.callout {
  padding: 1.5rem 1.75rem;
  border-radius: var(--radius-md);
  margin: 2rem 0;
  border-left: 4px solid var(--ink);
  background-color: var(--surface);
  border-top: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

.callout.butter {
  border-left-color: var(--butter);
  background-color: var(--butter-bg);
}

.callout.danger {
  border-left-color: var(--danger);
  background-color: var(--danger-bg);
}

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

.callout-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--ink);
}

/* Comparison Grid (Croissant vs Merdeneaua) */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2.5rem 0;
}

.comp-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.comp-card.butter-card {
  border-top: 4px solid var(--butter);
}

.comp-card.margarine-card {
  border-top: 4px solid var(--margarine);
}

.comp-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  align-self: flex-start;
  margin-bottom: 0.85rem;
  font-weight: 600;
}

.butter-card .comp-badge {
  background-color: var(--butter-bg);
  color: var(--butter-deep);
}

.margarine-card .comp-badge {
  background-color: var(--margarine-bg);
  color: var(--margarine-deep);
}

.comp-card h4 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  color: var(--ink);
}

.comp-temp {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--ink);
}

.comp-card ul {
  list-style: none;
  font-size: 0.92rem;
  color: var(--ink-soft);
  margin-top: auto;
}

.comp-card li {
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.comp-card li:last-child {
  border-bottom: none;
}

/* Interactive Simulator Section */
.instrument {
  padding: 5rem 0;
  background-color: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.instrument-box {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  margin-top: 2rem;
}

/* Temperature Slider Controls */
.slider-control-group {
  margin-bottom: 2.5rem;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1rem;
}

.slider-label {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
}

.temp-readout {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--ink);
}

.temp-readout span {
  font-size: 1.2rem;
  color: var(--ink-faint);
  font-weight: 500;
}

.slider-track-wrap {
  position: relative;
  margin: 1.5rem 0 1rem;
}

input[type="range"].temp-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 10px;
  border-radius: 5px;
  background: linear-gradient(90deg, #3b82f6 0%, #f59e0b 55%, #ef4444 100%);
  outline: none;
  cursor: pointer;
}

input[type="range"].temp-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid var(--ink);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  cursor: grab;
  transition: transform 0.1s ease;
}

input[type="range"].temp-slider::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.15);
}

input[type="range"].temp-slider::-moz-range-thumb {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid var(--ink);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  cursor: grab;
}

.preset-buttons {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.preset-btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--border);
  background-color: var(--surface-warm);
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  cursor: pointer;
  font-weight: 500;
  transition: all 0.15s ease;
}

.preset-btn:hover {
  background-color: var(--border-subtle);
  color: var(--ink);
}

.preset-btn[aria-pressed="true"] {
  background-color: var(--ink);
  color: #ffffff;
  border-color: var(--ink);
}

/* 4 Lipids Live Simulation Grid */
.lipids-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.lipid-card {
  background-color: var(--surface-warm);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.lipid-card.highlight {
  border-color: var(--butter);
  box-shadow: var(--shadow-sm);
}

.lipid-type-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
  margin-bottom: 0.35rem;
}

.lipid-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--ink);
  margin-bottom: 0.85rem;
}

.melt-beaker {
  height: 90px;
  background-color: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
  margin-bottom: 1rem;
  display: flex;
  align-items: flex-end;
}

.melt-fluid {
  width: 100%;
  transition: height 0.3s ease, background-color 0.3s ease;
}

.melt-label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink);
  text-align: center;
  width: 90%;
  pointer-events: none;
}

.lipid-state-box {
  margin-top: auto;
  font-size: 0.85rem;
}

.state-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

.state-solid {
  background-color: #e2e8f0;
  color: #334155;
}

.state-plastic {
  background-color: #fef3c7;
  color: #92400e;
}

.state-liquid {
  background-color: #dcfce7;
  color: #166534;
}

.state-waxy {
  background-color: #fee2e2;
  color: #991b1b;
}

.lipid-mouthfeel {
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--ink-soft);
}

/* Substitution Matrix / Harvard Calculator */
.matrix-box {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  margin-top: 2rem;
}

.sub-selector {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.sub-btn {
  padding: 1rem 0.85rem;
  border: 1px solid var(--border);
  background-color: var(--surface-warm);
  border-radius: var(--radius-md);
  text-align: left;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
}

.sub-btn:hover {
  background-color: var(--border-subtle);
}

.sub-btn[aria-pressed="true"] {
  background-color: var(--ink);
  color: #ffffff;
  border-color: var(--ink);
}

.sub-btn .sub-role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.8;
  margin-bottom: 0.35rem;
}

.sub-btn .sub-title {
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.25;
}

.sub-outcome {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2rem;
  padding: 2rem;
  background-color: var(--surface-warm);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.outcome-stat-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.outcome-stat-card .risk-delta {
  font-family: var(--font-mono);
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 0.6rem;
}

.risk-delta.benefit {
  color: var(--olive);
}

.risk-delta.harm {
  color: var(--danger);
}

.risk-delta.neutral {
  color: var(--ink-soft);
}

.outcome-stat-card .risk-desc {
  font-size: 0.95rem;
  color: var(--ink);
  line-height: 1.45;
}

.outcome-lipids-breakdown {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  justify-content: center;
}

.biomarker-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.75rem;
  background-color: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
}

.biomarker-name {
  font-weight: 600;
  color: var(--ink);
}

.biomarker-val {
  font-family: var(--font-mono);
  font-weight: 600;
}

/* Timeline Track */
.timeline-track {
  position: relative;
  margin: 3rem 0;
  padding-left: 2rem;
  border-left: 2px solid var(--border);
}

.timeline-event {
  position: relative;
  margin-bottom: 2.5rem;
}

.timeline-event:last-child {
  margin-bottom: 0;
}

.timeline-event::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 0.35rem;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--surface);
  border: 3px solid var(--ink);
}

.timeline-event.event-danger::before {
  border-color: var(--danger);
  background-color: var(--danger-bg);
}

.timeline-event.event-butter::before {
  border-color: var(--butter);
  background-color: var(--butter-bg);
}

.timeline-year {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--butter-deep);
  margin-bottom: 0.25rem;
}

.timeline-event.event-danger .timeline-year {
  color: var(--danger);
}

.timeline-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.timeline-desc {
  font-size: 0.95rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

/* Sources & Bibliography */
.sources-section {
  padding: 4.5rem 0;
  background-color: var(--surface-warm);
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}

.sources-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  margin-top: 1.5rem;
}

.sources-list li {
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--ink-soft);
  line-height: 1.55;
}

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

.sources-list strong {
  color: var(--ink);
}

.sources-list a {
  color: var(--butter-deep);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Footer */
footer {
  padding: 3rem 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg);
}

footer a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px dotted var(--ink-faint);
}

footer a:hover {
  color: var(--ink);
}

/* Responsive */
@media (max-width: 900px) {
  .ledgerline {
    grid-template-columns: repeat(2, 1fr);
  }
  .lipids-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .sub-selector {
    grid-template-columns: repeat(2, 1fr);
  }
  .sub-outcome {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 600px) {
  html {
    font-size: 16px;
  }
  .topbar {
    padding: 1rem 1.25rem;
  }
  .shell, .shell-wide {
    padding: 0 1.25rem;
  }
  .hero {
    padding: 3rem 0 2rem;
  }
  .ledgerline {
    grid-template-columns: 1fr;
    padding: 1.25rem;
    gap: 1rem;
  }
  .comparison-grid {
    grid-template-columns: 1fr;
  }
  .lipids-grid {
    grid-template-columns: 1fr;
  }
  .sub-selector {
    grid-template-columns: 1fr;
  }
  .instrument-box, .matrix-box {
    padding: 1.35rem;
  }
  .temp-readout {
    font-size: 1.75rem;
  }
  .outcome-stat-card .risk-delta {
    font-size: 2.2rem;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}