:root {
  --bg-primary: #0b0c10;
  --bg-surface: #13151c;
  --bg-card: #1b1e28;
  --bg-card-hover: #222634;
  --text-primary: #f0f2f7;
  --text-secondary: #a0a6b8;
  --text-muted: #6b7284;
  --accent-amber: #f5a623;
  --accent-gold: #d4af37;
  --accent-cyan: #38ef7d;
  --accent-gas: #38bdf8;
  --accent-tension: #ff4757;
  --border-subtle: #242938;
  --border-active: #f5a623;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.6);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

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

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

:focus-visible {
  outline: 2px solid var(--accent-amber);
  outline-offset: 3px;
}

/* Navigation */
.site-header {
  border-bottom: 1px solid var(--border-subtle);
  background-color: rgba(11, 12, 16, 0.92);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-link {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-badge {
  background: linear-gradient(135deg, var(--accent-amber), var(--accent-gold));
  color: #0b0c10;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lang-switch {
  display: flex;
  gap: 0.35rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 0.2rem;
  border-radius: 6px;
}

.lang-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
  transition: background-color 0.15s, color 0.15s;
}

.lang-link:hover {
  color: var(--text-primary);
}

.lang-link.active {
  background-color: var(--accent-amber);
  color: #0b0c10;
}

/* Container */
.main-wrapper {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  flex: 1;
  width: 100%;
}

/* Hero / Minto First Screen */
.hero {
  margin-bottom: 3.5rem;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-amber);
  background-color: rgba(245, 166, 35, 0.1);
  border: 1px solid rgba(245, 166, 35, 0.25);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  color: #ffffff;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 820px;
  margin-bottom: 2rem;
}

/* Answer-First Summary Box */
.conclusion-box {
  background: linear-gradient(180deg, rgba(27, 30, 40, 0.9) 0%, rgba(19, 21, 28, 0.95) 100%);
  border: 1px solid var(--accent-amber);
  border-left: 4px solid var(--accent-amber);
  border-radius: 10px;
  padding: 1.75rem;
  margin-bottom: 2.5rem;
  box-shadow: 0 4px 24px rgba(245, 166, 35, 0.08);
}

.conclusion-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-amber);
  font-weight: 700;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.conclusion-text {
  font-size: 1.12rem;
  color: var(--text-primary);
  line-height: 1.6;
}

.conclusion-text strong {
  color: #ffffff;
}

/* Key Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 3.5rem;
}

.metric-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s;
}

.metric-card:hover {
  transform: translateY(-2px);
  border-color: rgba(245, 166, 35, 0.4);
}

.metric-number {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--accent-amber);
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.metric-unit {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.metric-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.metric-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* Section styling */
.content-section {
  margin-bottom: 4.5rem;
}

.section-header {
  margin-bottom: 1.75rem;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-amber);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.35rem;
  display: block;
}

.section-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.prose {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

.prose p {
  margin-bottom: 1.25rem;
}

.prose strong {
  color: var(--text-primary);
}

/* Interactive Workbench */
.workbench-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-top: 1.5rem;
}

.workbench-toolbar {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.85rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.workbench-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.workbench-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.15s ease-in-out;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-amber), var(--accent-gold));
  color: #0b0c10;
  font-weight: 700;
}

.btn-primary:hover:not(:disabled) {
  filter: brightness(1.1);
  transform: scale(1.02);
}

.btn-secondary {
  background-color: var(--bg-surface);
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-card-hover);
  border-color: var(--text-secondary);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Canvas Display */
.canvas-wrapper {
  position: relative;
  background-color: #08090d;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-overlay-readout {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: rgba(11, 12, 16, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 0.6rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  pointer-events: none;
  backdrop-filter: blur(4px);
}

.readout-val {
  color: var(--accent-amber);
  font-weight: 700;
}

/* Workbench Controls */
.workbench-controls {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.control-value {
  font-family: var(--font-mono);
  color: var(--accent-amber);
  font-weight: 700;
}

.range-slider {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-card);
  border-radius: 3px;
  outline: none;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-amber);
  cursor: pointer;
  box-shadow: 0 0 8px rgba(245, 166, 35, 0.5);
  transition: transform 0.1s;
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.range-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-amber);
  cursor: pointer;
  border: none;
  box-shadow: 0 0 8px rgba(245, 166, 35, 0.5);
}

/* Instrument Telemetry Panel */
.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  padding: 1.25rem;
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
}

.telemetry-item {
  background-color: rgba(11, 12, 16, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 0.75rem;
  text-align: center;
}

.telemetry-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.telemetry-value {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
}

.telemetry-status {
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 0.25rem;
}

.status-normal { color: var(--accent-cyan); }
.status-tension { color: var(--accent-amber); }
.status-critical { color: var(--accent-tension); }
.status-cavitated { color: var(--accent-gas); }

/* Timeline & Comparison Grid */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

@media (max-width: 768px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

.comparison-col {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 1.5rem;
}

.comparison-col.highlight {
  border-color: rgba(245, 166, 35, 0.4);
  background: linear-gradient(180deg, var(--bg-surface) 0%, rgba(245, 166, 35, 0.03) 100%);
}

.comparison-header {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.fact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.fact-item {
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: flex;
  gap: 0.65rem;
  line-height: 1.5;
}

.fact-icon {
  flex-shrink: 0;
  color: var(--accent-amber);
}

/* Personal Knuckle Tracker / Interactive Dissolution Clock */
.clock-card {
  background: linear-gradient(135deg, #13151c 0%, #1b1e28 100%);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 2rem;
  margin: 2rem 0;
}

.clock-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 2rem;
  align-items: center;
}

@media (max-width: 768px) {
  .clock-layout {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.clock-dial-wrapper {
  position: relative;
  width: 220px;
  height: 220px;
  margin: 0 auto;
}

.clock-svg {
  transform: rotate(-90deg);
  width: 100%;
  height: 100%;
}

.clock-bg-ring {
  fill: none;
  stroke: var(--bg-card);
  stroke-width: 12;
}

.clock-progress-ring {
  fill: none;
  stroke: var(--accent-amber);
  stroke-width: 12;
  stroke-linecap: round;
  stroke-dasharray: 565.48;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.3s ease;
}

.clock-center-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.clock-timer-display {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1;
}

.clock-timer-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.35rem;
}

/* Table styling */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
}

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

.science-table th {
  background-color: var(--bg-card);
  color: var(--text-primary);
  font-weight: 700;
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.science-table td {
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

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

.science-table tr:nth-child(even) td {
  background-color: rgba(255, 255, 255, 0.015);
}

/* Method Note / References */
.method-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 1.75rem;
  margin-top: 3rem;
}

.method-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ref-list {
  list-style: decimal inside;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.ref-list li {
  line-height: 1.5;
}

.ref-list a {
  color: var(--accent-amber);
  text-decoration: none;
}

.ref-list a:hover {
  text-decoration: underline;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  padding: 2.5rem 1.25rem;
  margin-top: auto;
}

.footer-container {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

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

.footer-links a:hover {
  color: var(--accent-amber);
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s, background-color 0.2s;
  z-index: 90;
  box-shadow: var(--shadow-sm);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--accent-amber);
  color: #0b0c10;
}

/* 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;
  }
}