/* ThermoCog — Standalone Biomorphic Intelligence Architecture Stylesheet
 *
 * Dedicated to the 20-Watt thermodynamic hardware paradigm.
 * Published by RoamingPigs, Inc.
 */

:root {
  color-scheme: dark;

  /* Surfaces — Deep Cosmic Obsidian & Warm Graphite */
  --tc-page: #090a0d;
  --tc-raised: #11131a;
  --tc-sunken: #060709;
  --tc-card: #151822;
  --tc-card-hover: #1b1f2c;

  /* Ink */
  --tc-ink: #f8fafc;
  --tc-ink-dim: #94a3b8;
  --tc-ink-faint: #64748b;

  /* Lines */
  --tc-hairline: rgba(255, 255, 255, 0.08);
  --tc-hairline-strong: rgba(255, 255, 255, 0.16);

  /* Primary Signature Accent: Incandescent Thermal Amber / Copper */
  --tc-accent: #ff9838;              /* Radiant Thermal Amber */
  --tc-accent-light: #ffb86c;        /* Luminous Thermal Gold */
  --tc-accent-dim: rgba(255, 152, 56, 0.12);
  --tc-accent-glow: rgba(255, 152, 56, 0.32);
  --tc-accent-solid: #d97706;        /* Deep Copper Button */
  --tc-accent-warm: #f59e0b;         /* Kinetic Heat Amber */
  --tc-border: rgba(255, 152, 56, 0.28);
  --tc-border-hover: rgba(255, 152, 56, 0.55);

  /* Secondary Spectrum: Thermodynamic Energy States */
  --tc-heat: #ff5449;                /* Dissipation / High-Entropy Coral */
  --tc-heat-dim: rgba(255, 84, 73, 0.12);
  --tc-cryo: #38bdf8;                /* Ground State / Landauer Baseline */
  --tc-cryo-dim: rgba(56, 189, 248, 0.12);
  --tc-gold: #fbbf24;

  /* Type & Layout */
  --tc-font-ui: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --tc-font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --tc-measure: 68rem;              /* Expanded to 1088px for rich scientific displays */
  --tc-measure-prose: 48rem;        /* 768px for optimal reading column */
  --tc-radius-sm: 4px;
  --tc-radius: 8px;
  --tc-radius-lg: 12px;
  --tc-leading-tight: 1.25;
  --tc-leading-body: 1.62;
  --tc-transition: 0.2s ease;

  /* Canonical Math Typography Contract Mapping */
  --math-color: var(--tc-accent-light);
  --math-accent: var(--tc-accent);
  --math-dim: var(--tc-ink-dim);
  --math-surface: var(--tc-sunken);
  --math-border: var(--tc-hairline-strong);
  --math-border-accent: var(--tc-accent);
  --math-radius: var(--tc-radius-sm);
  --math-legend-color: var(--tc-ink-dim);
}

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

body {
  margin: 0;
  padding: 0;
  background-color: var(--tc-page);
  color: var(--tc-ink);
  font-family: var(--tc-font-ui);
  font-size: 1rem;
  line-height: var(--tc-leading-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--tc-accent);
  text-decoration: underline;
  text-decoration-color: var(--tc-hairline-strong);
  text-underline-offset: 0.18em;
  transition: color var(--tc-transition), text-decoration-color var(--tc-transition);
}

a:hover {
  color: var(--tc-ink);
  text-decoration-color: currentColor;
}

/* Container */
.tc-container {
  max-width: var(--tc-measure);
  margin: 0 auto;
  padding: 3.5rem 2rem 4rem;
}

.tc-prose,
p.tc-hint,
.tc-lead,
.tc-primer p {
  max-width: var(--tc-measure-prose);
}

/* Header & Kicker */
.tc-kicker {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.tc-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.65rem;
  border-radius: 9999px;
  font-family: var(--tc-font-mono);
  font-size: 0.78rem;
  border: 1px solid var(--tc-hairline);
  color: var(--tc-ink-dim);
  background: var(--tc-raised);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.tc-pill-brand {
  color: var(--tc-accent);
  border-color: var(--tc-border);
  background: var(--tc-accent-dim);
  font-weight: 600;
}

.tc-pill-status {
  border-color: rgba(251, 146, 60, 0.35);
  color: var(--tc-accent-warm);
}

.tc-subtitle {
  font-family: var(--tc-font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--tc-accent);
  margin: 0 0 0.5rem 0;
}

h1 {
  font-size: clamp(2rem, 1.6rem + 2vw, 3rem);
  font-weight: 700;
  line-height: var(--tc-leading-tight);
  margin: 0 0 1rem 0;
  color: var(--tc-ink);
  letter-spacing: -0.02em;
}

.tc-lede {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--tc-ink);
  margin: 0 0 1.5rem 0;
}

/* Primer Expandable Accordion */
.tc-primer {
  margin: 1.5rem 0 2.5rem;
  border: 1px solid var(--tc-border);
  background: var(--tc-raised);
  border-radius: var(--tc-radius);
  padding: 0.75rem 1.25rem;
}

.tc-primer summary {
  cursor: pointer;
  font-family: var(--tc-font-mono);
  font-size: 0.9rem;
  color: var(--tc-accent);
  font-weight: 600;
  user-select: none;
  padding: 0.25rem 0;
}

.tc-primer summary:hover {
  color: var(--tc-ink);
}

.tc-primer[open] summary {
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--tc-hairline);
  padding-bottom: 0.5rem;
}

.tc-primer-body {
  font-size: 0.92rem;
  color: var(--tc-ink-dim);
  line-height: 1.6;
}

.tc-grounding {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--tc-sunken);
  border-left: 3px solid var(--tc-accent);
  border-radius: 0 var(--tc-radius-sm) var(--tc-radius-sm) 0;
}

.tc-grounding h3 {
  margin: 0 0 0.25rem 0;
  font-size: 0.85rem;
  font-family: var(--tc-font-mono);
  color: var(--tc-accent);
}

.tc-grounding p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--tc-ink-dim);
}

/* Panels */
.tc-panel {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--tc-hairline-strong);
}

.tc-panel h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  color: var(--tc-ink);
  letter-spacing: -0.01em;
}

.tc-hint {
  font-size: 0.9rem;
  color: var(--tc-ink-dim);
  margin: 0 0 1.25rem 0;
  line-height: 1.55;
}

.tc-callout {
  margin: 1.5rem 0 0;
  padding: 1rem 1.25rem;
  background: var(--tc-raised);
  border-left: 3px solid var(--tc-accent);
  border-radius: 0 var(--tc-radius-sm) var(--tc-radius-sm) 0;
  font-size: 0.88rem;
  color: var(--tc-ink-dim);
  line-height: 1.55;
}

.tc-callout strong {
  color: var(--tc-ink);
}

/* Preset Buttons */
.tc-presets {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 1.25rem 0;
}

.tc-btn {
  font-family: var(--tc-font-mono);
  font-size: 0.82rem;
  padding: 0.45rem 0.85rem;
  background: var(--tc-raised);
  border: 1px solid var(--tc-hairline-strong);
  color: var(--tc-ink-dim);
  border-radius: var(--tc-radius-sm);
  cursor: pointer;
  transition: all var(--tc-transition);
}

.tc-btn:hover {
  background: var(--tc-card);
  color: var(--tc-ink);
  border-color: var(--tc-ink-dim);
}

.tc-btn[aria-pressed="true"] {
  background: var(--tc-accent-dim);
  border-color: var(--tc-accent);
  color: var(--tc-accent);
  font-weight: 600;
}

.tc-btn:focus-visible {
  outline: 2px solid var(--tc-accent);
  outline-offset: 2px;
}

/* Metrics Grid */
.tc-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.25rem 0;
}

.tc-metric-card {
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline);
  border-radius: var(--tc-radius-sm);
  padding: 1rem;
  display: flex;
  flex-direction: column;
}

.tc-metric-label {
  font-family: var(--tc-font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--tc-ink-dim);
  margin: 0 0 0.4rem 0;
}

.tc-metric-val {
  font-family: var(--tc-font-mono);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--tc-accent);
  margin: 0;
  line-height: 1.2;
}

.tc-metric-unit {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--tc-ink-dim);
  margin-left: 0.15rem;
}

.tc-metric-sub {
  font-size: 0.78rem;
  color: var(--tc-ink-dim);
  margin: 0.4rem 0 0 0;
}

/* Logarithmic Scale Ruler */
.tc-log-scale {
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline);
  border-radius: var(--tc-radius-sm);
  padding: 1.25rem;
  margin: 1.25rem 0;
}

.tc-bar-labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--tc-font-mono);
  font-size: 0.72rem;
  color: var(--tc-ink-dim);
  margin-bottom: 0.5rem;
}

.tc-log-ruler-svg {
  width: 100%;
  height: 48px;
  display: block;
}

.tc-bar-track {
  width: 100%;
  height: 6px;
  background: var(--tc-sunken);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.tc-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--tc-accent), var(--tc-accent-warm));
  transition: width 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.tc-hintline {
  font-size: 0.82rem;
  color: var(--tc-ink-dim);
  margin: 0.75rem 0 0 0;
  line-height: 1.45;
}

/* Timescale Tri-Loop Visualizer */
.tc-timescale-vis {
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline);
  border-radius: var(--tc-radius-sm);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.tc-tri-loops-svg {
  width: 100%;
  height: 140px;
  display: block;
  margin-bottom: 1rem;
}

.tc-stepper-display {
  padding: 1rem;
  background: var(--tc-sunken);
  border-radius: 4px;
  border-left: 3px solid var(--tc-accent);
}

.tc-stepper-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.tc-stepper-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--tc-accent);
}

.tc-stepper-time {
  font-family: var(--tc-font-mono);
  font-size: 0.78rem;
  color: var(--tc-accent-warm);
}

.tc-stepper-desc {
  font-size: 0.88rem;
  color: var(--tc-ink-dim);
  margin: 0 0 0.5rem 0;
  line-height: 1.5;
}

.tc-stepper-analogy {
  font-size: 0.82rem;
  color: var(--tc-ink-faint);
  margin: 0;
  font-style: italic;
}

/* Circuit Simulator */
.tc-circuit-vis {
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline);
  border-radius: var(--tc-radius-sm);
  padding: 1.25rem;
  margin: 1.25rem 0;
}

.tc-circuit-svg {
  width: 100%;
  height: 160px;
  display: block;
  margin-bottom: 1rem;
}

.tc-circuit-status {
  text-align: center;
  font-family: var(--tc-font-mono);
  font-size: 0.82rem;
  color: var(--tc-accent);
  padding: 0.6rem 0.85rem;
  background: var(--tc-sunken);
  border-radius: 4px;
  border: 1px solid var(--tc-hairline);
  line-height: 1.45;
}

/* Accessible Table Wrapper */
.tc-tablewrap {
  width: 100%;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--tc-hairline);
  border-radius: var(--tc-radius-sm);
}

.tc-tablewrap:focus-visible {
  outline: 2px solid var(--tc-accent);
  outline-offset: 2px;
}

.tc-compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  line-height: 1.45;
  text-align: left;
}

.tc-compare-table th {
  padding: 0.65rem 0.75rem;
  background: var(--tc-raised);
  border-bottom: 2px solid var(--tc-border);
  color: var(--tc-ink);
  font-family: var(--tc-font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tc-compare-table td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--tc-hairline);
  color: var(--tc-ink-dim);
}

.tc-compare-table th:nth-child(1),
.tc-compare-table td:nth-child(1) {
  width: 28%;
}

.tc-compare-table th:nth-child(2),
.tc-compare-table td:nth-child(2) {
  width: 36%;
}

.tc-compare-table th:nth-child(3),
.tc-compare-table td:nth-child(3) {
  width: 36%;
}

.tc-compare-table tr:hover td {
  background: var(--tc-card);
  color: var(--tc-ink);
}

/* Scientific High-Density Data Tables */
.tc-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84rem;
  line-height: 1.5;
  text-align: left;
}

.tc-data-table th {
  padding: 0.75rem 0.85rem;
  background: var(--tc-raised);
  border-bottom: 2px solid var(--tc-border);
  color: var(--tc-ink);
  font-family: var(--tc-font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.tc-data-table td {
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid var(--tc-hairline);
  color: var(--tc-ink-dim);
}

.tc-data-table td.tc-num {
  font-family: var(--tc-font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--tc-accent);
}

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

.tc-data-table tr:hover td {
  background: var(--tc-card);
  color: var(--tc-ink);
}

/* Standalone Hyper-Optimized Mathematical Typography (Zero External Libraries) */
.tc-math-box {
  background: var(--tc-sunken);
  border: 1px solid var(--tc-hairline-strong);
  border-left: 3px solid var(--tc-accent);
  border-radius: var(--tc-radius-sm);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  overflow-x: auto;
}

.tc-math-equation {
  font-family: "Latin Modern Math", "Cambria Math", "STIX Two Math", "TeX Gyre Termes Math", "Computer Modern Serif", "Times New Roman", Times, serif;
  font-size: 1.28rem;
  color: var(--tc-accent-light);
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.2em 0;
  padding: 0.45rem 0.5rem;
  letter-spacing: 0.01em;
  user-select: all;
  -webkit-font-smoothing: antialiased;
}

/* Math Variables (Italic Serif) */
.tc-var {
  font-style: italic;
  padding: 0 0.05em;
}

/* Standard Function Names & Roman Text (Upright) */
.tc-math-fn {
  font-style: normal;
  font-family: var(--tc-font-sans);
  font-size: 0.9em;
  font-weight: 600;
  padding: 0 0.15em;
  letter-spacing: 0.02em;
}

/* Operators & Mathematical Relations */
.tc-math-op {
  font-style: normal;
  margin: 0 0.35em;
  color: var(--tc-accent);
  display: inline-block;
}

/* Wide Quad Spacing */
.tc-math-quad {
  display: inline-block;
  width: 1.65rem;
}

/* Standard & Tall Delimiters (Parentheses, Brackets) */
.tc-math-delim {
  font-style: normal;
  font-weight: 300;
  display: inline-block;
  transform: scaleY(1.2);
  margin: 0 0.06em;
  color: var(--tc-ink-dim);
}

.tc-math-delim-lg {
  font-style: normal;
  font-weight: 200;
  display: inline-block;
  transform: scaleY(1.65);
  vertical-align: -0.06em;
  margin: 0 0.08em;
  color: var(--tc-ink-dim);
}

/* True Vertical Fractions */
.tc-math-frac {
  display: inline-flex;
  flex-direction: column;
  vertical-align: -0.65em;
  margin: 0 0.28em;
  text-align: center;
  line-height: 1;
}

.tc-math-frac > .tc-num {
  display: block;
  font-size: 0.88em;
  padding-bottom: 0.22em;
  border-bottom: 1.5px solid var(--tc-accent-light);
  line-height: 1.1;
}

.tc-math-frac > .tc-den {
  display: block;
  font-size: 0.88em;
  padding-top: 0.22em;
  line-height: 1.1;
}

/* Limits with Subscript Expression */
.tc-math-lim {
  display: inline-flex;
  flex-direction: column;
  vertical-align: -0.78em;
  margin: 0 0.35em;
  text-align: center;
  line-height: 1;
}

.tc-math-lim > .tc-lim-name {
  font-style: normal;
  font-size: 0.95em;
}

.tc-math-lim > .tc-lim-to {
  font-size: 0.68em;
  margin-top: 0.18em;
  color: var(--tc-ink-dim);
  letter-spacing: -0.02em;
}

/* Pure CSS Superscripts and Subscripts */
.tc-math-sup {
  font-size: 0.7em;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
  top: -0.58em;
  margin-left: 0.05em;
}

.tc-math-sub {
  font-size: 0.7em;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
  bottom: -0.25em;
  margin-left: 0.05em;
}

/* Stacked Subscript + Superscript (e.g. s_i^β) */
.tc-math-subsup {
  display: inline-flex;
  flex-direction: column;
  vertical-align: -0.48em;
  margin-left: 0.08em;
  line-height: 1;
  font-size: 0.7em;
  text-align: left;
}

.tc-math-subsup > .tc-math-sup-stacked {
  margin-bottom: 0.22em;
}

.tc-math-subsup > .tc-math-sub-stacked {
  margin-top: 0.08em;
}

/* Blackboard Bold (Expectation E) */
.tc-math-bb {
  font-style: normal;
  font-family: "Latin Modern Math", "Cambria Math", "STIX Two Math", serif;
  font-size: 1.1em;
  font-weight: 700;
  padding: 0 0.08em;
}

/* Calligraphic Script (Lagrangian L, Free Energy F) */
.tc-math-cal {
  font-style: italic;
  font-family: "Latin Modern Math", "Cambria Math", "STIX Two Math", "Apple Chancery", "Baskerville", serif;
  font-size: 1.2em;
  font-weight: 600;
  padding: 0 0.08em;
}

.tc-math-legend {
  font-size: 0.82rem;
  color: var(--tc-ink-dim);
  line-height: 1.6;
  margin: 0;
  border-top: 1px solid var(--tc-hairline);
  padding-top: 0.65rem;
}

.tc-math-legend code {
  color: var(--tc-accent-light);
  background: var(--tc-card);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  border: 1px solid var(--tc-hairline);
  font-family: var(--tc-font-mono);
  font-size: 0.85em;
}

/* Timescale Architectural Stack (Panel 2) */
.tc-timescale-stack {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
  margin: 1.75rem 0;
}

.tc-loop-tier {
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline-strong);
  border-radius: var(--tc-radius);
  padding: 1.5rem 1.75rem;
  transition: transform var(--tc-transition), border-color var(--tc-transition), box-shadow var(--tc-transition);
}

.tc-loop-tier:hover {
  border-color: var(--tc-border);
  box-shadow: 0 6px 28px rgba(0, 0, 0, 0.45);
}

.tc-loop-tier.tc-loop-active {
  border-color: var(--tc-accent);
  box-shadow: 0 0 0 1px var(--tc-accent), 0 8px 30px rgba(255, 152, 56, 0.15);
}

.tc-loop-tier-header {
  margin-bottom: 1.15rem;
  border-bottom: 1px solid var(--tc-hairline);
  padding-bottom: 0.85rem;
}

.tc-loop-badge-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.tc-loop-badge {
  font-family: var(--tc-font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.22rem 0.65rem;
  border-radius: 4px;
}

.tc-badge-loop1 {
  background: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.35);
}

.tc-badge-loop2 {
  background: rgba(251, 146, 60, 0.15);
  color: #fb923c;
  border: 1px solid rgba(251, 146, 60, 0.35);
}

.tc-badge-loop3 {
  background: rgba(255, 152, 56, 0.18);
  color: var(--tc-accent-light);
  border: 1px solid var(--tc-border);
}

.tc-timescale-badge {
  font-family: var(--tc-font-mono);
  font-size: 0.76rem;
  color: var(--tc-ink-faint);
  letter-spacing: 0.04em;
}

.tc-loop-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--tc-ink);
  margin: 0;
  line-height: 1.35;
}

.tc-loop-tier-body {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 2rem;
  align-items: start;
}

.tc-loop-tier-overview p {
  font-size: 0.92rem;
  color: var(--tc-ink-dim);
  line-height: 1.65;
  margin: 0 0 1.25rem 0;
}

.tc-loop-stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--tc-sunken);
  border: 1px solid var(--tc-hairline-strong);
  border-radius: 4px;
  padding: 0.45rem 0.75rem;
  font-size: 0.8rem;
  flex-wrap: wrap;
}

.tc-pill-label {
  color: var(--tc-ink-faint);
  font-family: var(--tc-font-mono);
}

.tc-pill-val {
  color: var(--tc-accent-light);
  font-family: var(--tc-font-mono);
  font-weight: 600;
}

.tc-loop-tier-details {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.tc-math-in-card {
  margin: 0 0 0.75rem 0;
  padding: 0.85rem 1.15rem;
}

.tc-math-in-card .tc-math-equation {
  font-size: 1.05rem;
}

/* Deep Technical Cards & Grids */
.tc-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.tc-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.tc-deep-card {
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline-strong);
  border-radius: var(--tc-radius);
  padding: 1.35rem 1.5rem;
  display: flex;
  flex-direction: column;
  transition: border-color var(--tc-transition);
}

.tc-deep-card:hover {
  border-color: var(--tc-border);
}

.tc-deep-card-tag {
  font-family: var(--tc-font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--tc-accent);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.tc-deep-card h3, .tc-deep-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--tc-ink);
  margin: 0 0 0.65rem 0;
}

.tc-deep-card p {
  font-size: 0.88rem;
  color: var(--tc-ink-dim);
  line-height: 1.6;
  margin: 0 0 0.85rem 0;
}

.tc-deep-card p:last-child {
  margin-bottom: 0;
}

.tc-deep-list {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0 0;
  font-size: 0.84rem;
  color: var(--tc-ink-dim);
}

.tc-deep-list li {
  position: relative;
  padding-left: 1.15rem;
  margin-bottom: 0.65rem;
  line-height: 1.55;
}

.tc-deep-list li::before {
  content: "›";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--tc-accent);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.4;
}

.tc-deep-list li strong {
  color: var(--tc-ink);
}

.tc-deep-list code {
  color: var(--tc-accent-light);
  background: var(--tc-sunken);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  border: 1px solid var(--tc-hairline);
  font-family: var(--tc-font-mono);
  font-size: 0.85em;
}

/* Stat Highlight Box */
.tc-stat-highlight {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline-strong);
  border-radius: var(--tc-radius-sm);
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
}

.tc-stat-highlight-num {
  font-family: var(--tc-font-mono);
  font-size: 2rem;
  font-weight: 800;
  color: var(--tc-accent);
  line-height: 1;
}

.tc-stat-highlight-text {
  font-size: 0.88rem;
  color: var(--tc-ink-dim);
  line-height: 1.45;
  margin: 0;
}


/* Sleep & Homeostasis Interactive */
.tc-sleep-vis {
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline);
  border-radius: var(--tc-radius-sm);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.tc-sleep-chart-svg {
  width: 100%;
  height: 120px;
  display: block;
  margin-bottom: 1rem;
}

.tc-sleep-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.tc-sleep-stat {
  padding: 0.5rem 0.75rem;
  background: var(--tc-sunken);
  border-radius: 4px;
  border: 1px solid var(--tc-hairline);
}

.tc-sleep-stat-label {
  font-size: 0.72rem;
  color: var(--tc-ink-dim);
  font-family: var(--tc-font-mono);
  margin: 0 0 0.25rem 0;
}

.tc-sleep-stat-val {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: var(--tc-font-mono);
  color: var(--tc-accent);
  margin: 0;
}

/* Institutional Inquiry */
.tc-inquiry {
  margin: 3.5rem 0;
  padding: 1.5rem;
  background: var(--tc-card);
  border: 1px solid var(--tc-border);
  border-radius: var(--tc-radius);
}

.tc-inquiry h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--tc-ink);
  margin: 0 0 0.5rem 0;
}

.tc-inquiry p {
  font-size: 0.9rem;
  color: var(--tc-ink-dim);
  line-height: 1.6;
  margin: 0 0 1rem 0;
}

.tc-inquiry-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--tc-font-mono);
  font-size: 0.85rem;
  color: #0b0d0f;
  background: var(--tc-accent);
  padding: 0.55rem 1rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  transition: opacity var(--tc-transition);
}

.tc-inquiry-link:hover {
  opacity: 0.9;
  color: #0b0d0f;
}

/* Academic Foundations & Reference Archive */
.tc-colophon {
  margin: 3.5rem 0 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--tc-hairline-strong);
}

.tc-colophon h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  color: var(--tc-ink);
  letter-spacing: -0.01em;
}

.tc-ref-group {
  margin-top: 2rem;
}

.tc-ref-category {
  font-family: var(--tc-font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--tc-accent);
  margin: 0 0 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tc-ref-category::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--tc-border);
}

.tc-sources {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.tc-ref-item {
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline);
  border-radius: var(--tc-radius-sm);
  padding: 0.85rem 1rem;
  transition: border-color var(--tc-transition), background var(--tc-transition);
}

.tc-ref-item:hover {
  background: var(--tc-raised);
  border-color: var(--tc-border);
}

.tc-ref-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
  flex-wrap: wrap;
}

.tc-ref-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--tc-ink);
  text-decoration: none;
  line-height: 1.4;
}

.tc-ref-title:hover {
  color: var(--tc-accent);
  text-decoration: underline;
}

.tc-ref-tag {
  display: inline-block;
  font-family: var(--tc-font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.45rem;
  border-radius: 3px;
  background: var(--tc-sunken);
  color: var(--tc-ink-dim);
  border: 1px solid var(--tc-hairline);
  white-space: nowrap;
}

.tc-ref-meta {
  font-size: 0.8rem;
  color: var(--tc-ink-dim);
  line-height: 1.5;
  margin-bottom: 0.35rem;
}

.tc-ref-authors {
  color: var(--tc-ink-dim);
}

.tc-ref-venue {
  color: var(--tc-ink-faint);
  font-style: italic;
}

.tc-ref-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-family: var(--tc-font-mono);
  font-size: 0.74rem;
  color: var(--tc-accent);
  text-decoration: none;
  word-break: break-all;
}

.tc-ref-link:hover {
  text-decoration: underline;
  color: var(--tc-ink);
}

/* ThermoCog Etymology & Thesis Card */
.tc-thesis-card {
  margin: 1.75rem 0 2rem;
  padding: 1.5rem 1.75rem;
  background: linear-gradient(135deg, rgba(255, 152, 56, 0.08) 0%, rgba(21, 24, 34, 0.95) 60%);
  border: 1px solid var(--tc-border);
  border-left: 4px solid var(--tc-accent);
  border-radius: var(--tc-radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.tc-thesis-badge {
  display: inline-block;
  font-family: var(--tc-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--tc-accent);
  background: var(--tc-accent-dim);
  border: 1px solid var(--tc-border);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  margin-bottom: 0.85rem;
}

.tc-thesis-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.75rem;
}

.tc-thesis-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
  font-family: var(--tc-font-ui);
}

.tc-thesis-sub {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--tc-accent-light);
  letter-spacing: -0.01em;
}

.tc-thesis-body {
  margin: 0;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--tc-ink);
}

.tc-primer-lead {
  margin-top: 0;
  margin-bottom: 0.85rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px dashed var(--tc-hairline-strong);
  color: var(--tc-ink);
}

/* Audio Briefings & Discussions */
.tc-audio-panel {
  /* Inherits panel styling */
}

.tc-featured-audio {
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline-strong);
  border-radius: var(--tc-radius-lg);
  padding: 1.75rem;
  margin-bottom: 1.75rem;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.tc-audio-badge {
  display: inline-block;
  font-family: var(--tc-font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--tc-accent);
  background: var(--tc-accent-dim);
  border: 1px solid var(--tc-border);
  padding: 0.2rem 0.6rem;
  border-radius: var(--tc-radius-sm);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tc-audio-title {
  margin: 0 0 0.5rem 0;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
}

.tc-audio-desc {
  margin: 0 0 1.25rem 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--tc-ink-dim);
}

.tc-player-wrap {
  margin: 1.25rem 0;
  background: var(--tc-sunken);
  border: 1px solid var(--tc-hairline);
  border-radius: var(--tc-radius);
  padding: 0.75rem 1rem;
}

.tc-audio-element {
  width: 100%;
  height: 40px;
  outline: none;
  accent-color: var(--tc-accent);
}

.tc-audio-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.tc-audio-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--tc-font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--tc-ink);
  background: var(--tc-raised);
  border: 1px solid var(--tc-border);
  padding: 0.5rem 1rem;
  border-radius: var(--tc-radius-sm);
  text-decoration: none;
  transition: all var(--tc-transition);
}

.tc-audio-btn:hover {
  background: var(--tc-accent);
  color: #000;
  border-color: var(--tc-accent);
  text-decoration: none;
}

.tc-audio-btn-secondary {
  border-color: var(--tc-hairline-strong);
  color: var(--tc-ink-dim);
}

.tc-audio-btn-secondary:hover {
  border-color: var(--tc-accent);
  color: var(--tc-ink);
  background: var(--tc-accent-dim);
}

/* Transcript Drawer */
.tc-transcript-drawer {
  margin-top: 1.5rem;
  border: 1px solid var(--tc-hairline);
  background: var(--tc-sunken);
  border-radius: var(--tc-radius);
  overflow: hidden;
}

.tc-transcript-drawer summary {
  padding: 0.85rem 1.25rem;
  cursor: pointer;
  font-family: var(--tc-font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--tc-accent-light);
  background: rgba(255, 255, 255, 0.02);
  user-select: none;
}

.tc-transcript-drawer summary:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

.tc-transcript-content {
  padding: 1.25rem;
  border-top: 1px solid var(--tc-hairline);
  max-height: 480px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.tc-transcript-turn {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--tc-hairline);
}

.tc-transcript-turn:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.tc-transcript-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.tc-cue-seek {
  background: var(--tc-accent-dim);
  color: var(--tc-accent);
  border: 1px solid var(--tc-border);
  font-family: var(--tc-font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--tc-radius-sm);
  cursor: pointer;
  transition: all var(--tc-transition);
}

.tc-cue-seek:hover {
  background: var(--tc-accent);
  color: #000;
  border-color: var(--tc-accent);
}

.tc-transcript-turn {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--tc-radius-sm);
  border-left: 3px solid transparent;
  transition: all var(--tc-transition);
}

.tc-transcript-turn.tc-active-cue {
  background: rgba(255, 152, 56, 0.08);
  border-left: 3px solid var(--tc-accent);
}

.tc-transcript-turn.tc-active-cue p {
  color: #fff;
}

.tc-transcript-turn p {
  margin: 0.25rem 0 0 0;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--tc-ink-dim);
}

/* Audio Controls Row */
.tc-audio-controls-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--tc-hairline);
}

.tc-jump-controls, .tc-speed-controls {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.tc-control-label {
  font-family: var(--tc-font-mono);
  font-size: 0.72rem;
  color: var(--tc-ink-faint);
  margin-right: 0.25rem;
}

.tc-jump-btn, .tc-speed-btn {
  background: var(--tc-raised);
  border: 1px solid var(--tc-hairline-strong);
  color: var(--tc-ink-dim);
  font-family: var(--tc-font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.55rem;
  border-radius: var(--tc-radius-sm);
  cursor: pointer;
  transition: all var(--tc-transition);
}

.tc-jump-btn:hover, .tc-speed-btn:hover {
  background: var(--tc-accent-dim);
  border-color: var(--tc-accent);
  color: #fff;
}

.tc-speed-btn.tc-speed-active {
  background: var(--tc-accent);
  border-color: var(--tc-accent);
  color: #000;
  font-weight: 700;
}

/* Live Subtitles Display */
.tc-live-subtitles {
  margin: 1.25rem 0;
  padding: 1.25rem 1.5rem;
  background: radial-gradient(circle at top left, rgba(255, 152, 56, 0.08), transparent 70%), var(--tc-sunken);
  border: 1px solid var(--tc-border);
  border-radius: var(--tc-radius);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.4);
  transition: border-color var(--tc-transition), box-shadow var(--tc-transition);
}

.tc-live-subtitles.tc-live-active {
  border-color: var(--tc-accent);
  box-shadow: 0 0 18px rgba(255, 152, 56, 0.15), inset 0 1px 3px rgba(0, 0, 0, 0.4);
}

.tc-live-subtitles-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.tc-live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--tc-ink-faint);
  transition: background var(--tc-transition);
}

.tc-live-subtitles.tc-live-playing .tc-live-dot {
  background: var(--tc-accent);
  box-shadow: 0 0 8px var(--tc-accent);
  animation: tc-pulse 2s infinite;
}

@keyframes tc-pulse {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.7; }
  100% { transform: scale(1); opacity: 1; }
}

.tc-live-label {
  font-family: var(--tc-font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--tc-accent);
}

.tc-live-text {
  margin: 0;
  font-size: 1.12rem;
  line-height: 1.6;
  color: #fff;
  font-family: var(--tc-font-ui);
  font-weight: 500;
  min-height: 3.2rem;
  display: flex;
  align-items: center;
}

/* FAQ Panel & Accordion Grid */
.tc-faq-panel {
  /* Inherits panel styling */
}

.tc-faq-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.tc-faq-item {
  background: var(--tc-card);
  border: 1px solid var(--tc-hairline-strong);
  border-radius: var(--tc-radius);
  transition: border-color var(--tc-transition), background-color var(--tc-transition);
  overflow: hidden;
}

.tc-faq-item[open] {
  border-color: var(--tc-border);
  background: var(--tc-raised);
}

.tc-faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.15rem 1.4rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--tc-ink);
  cursor: pointer;
  user-select: none;
  list-style: none;
  gap: 1rem;
}

.tc-faq-question::-webkit-details-marker {
  display: none;
}

.tc-faq-q-title {
  margin: 0;
  padding: 0;
  font-size: inherit;
  font-weight: inherit;
  font-family: inherit;
  color: inherit;
  line-height: inherit;
  display: inline;
}

.tc-faq-question:hover {
  color: var(--tc-accent-light);
}

.tc-faq-toggle {
  font-family: var(--tc-font-mono);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--tc-accent);
  transition: transform var(--tc-transition);
  flex-shrink: 0;
}

.tc-faq-item[open] .tc-faq-toggle {
  transform: rotate(45deg);
}

.tc-faq-answer {
  padding: 0 1.4rem 1.4rem;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--tc-ink-dim);
  border-top: 1px solid var(--tc-hairline);
  margin-top: -0.25rem;
  padding-top: 1rem;
}

.tc-faq-answer p {
  margin: 0 0 0.85rem 0;
}

.tc-faq-answer p:last-child {
  margin-bottom: 0;
}

.tc-faq-list {
  margin: 0.5rem 0 0.85rem 1.25rem;
  padding: 0;
}

.tc-faq-list li {
  margin-bottom: 0.4rem;
}

/* Footer */
footer {
  max-width: var(--tc-measure);
  margin: 0 auto;
  padding: 2.5rem 2rem 5rem;
  border-top: 1px solid var(--tc-hairline);
}

.tc-footer-inner {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.tc-footer-note {
  font-size: 0.82rem;
  color: var(--tc-ink-dim);
  margin: 0;
  line-height: 1.55;
}

/* Responsive Rules */
@media (max-width: 960px) {
  .tc-loop-tier-body {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .tc-grid-2, .tc-grid-3, .tc-audio-grid {
    grid-template-columns: 1fr;
  }
  .tc-container {
    padding: 2.5rem 1.25rem 3rem;
  }
  footer {
    padding: 2rem 1.25rem 4rem;
  }
}

@media (max-width: 480px) {
  .tc-metrics-grid {
    grid-template-columns: 1fr;
  }
  .tc-sleep-meta {
    grid-template-columns: 1fr;
  }
  .tc-presets {
    flex-direction: column;
  }
  .tc-btn {
    width: 100%;
    text-align: center;
  }
  .tc-container {
    padding: 2rem 1rem 1.5rem;
  }
  .tc-stat-highlight {
    flex-direction: column;
    gap: 0.25rem;
  }
}

/* ==========================================================================
   FOUNDATIONAL LEXICON & GLOSSARY
   ========================================================================== */
.tc-glossary-panel {
  background: rgba(14, 16, 22, 0.7);
  border: 1px solid rgba(255, 152, 56, 0.18);
  border-radius: 12px;
  padding: 2.5rem;
  margin: 3.5rem 0;
}

.tc-glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.tc-glossary-entry {
  background: rgba(9, 10, 13, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 1.5rem;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  scroll-margin-top: 5rem;
}

.tc-glossary-entry:hover,
.tc-glossary-entry:target {
  border-color: var(--tc-accent, #ff9838);
  box-shadow: 0 0 20px rgba(255, 152, 56, 0.12);
  transform: translateY(-2px);
}

.tc-glossary-term {
  font-family: var(--tc-font-sans, system-ui, sans-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.65rem;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.tc-glossary-term a {
  color: inherit;
  text-decoration: none;
}

.tc-glossary-term a:hover {
  color: var(--tc-accent, #ff9838);
}

.tc-glossary-tag {
  font-family: var(--tc-font-mono, monospace);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--tc-accent, #ff9838);
  background: rgba(255, 152, 56, 0.1);
  border: 1px solid rgba(255, 152, 56, 0.25);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  white-space: nowrap;
}

.tc-glossary-def {
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.92rem;
  line-height: 1.6;
}

.tc-glossary-def strong {
  color: #ffffff;
}

.tc-glossary-def code {
  font-family: var(--tc-font-mono, monospace);
  font-size: 0.88em;
  color: var(--tc-accent, #ff9838);
  background: rgba(255, 152, 56, 0.08);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}