body.tda-notes-page {
  --tda-paper: rgba(18, 24, 21, 0.72);
  --tda-paper-strong: rgba(20, 27, 23, 0.82);
  --tda-grid-minor: rgba(255, 255, 255, 0.015);
  --tda-grid-major: rgba(255, 255, 255, 0.028);
  --tda-ink: var(--site-text);
  --tda-ink-soft: var(--site-text-muted);
  --tda-ink-faint: var(--site-text-soft);
  --tda-yellow: #ebd46a;
  --tda-orange: #f19d5c;
  --tda-green: #8bc58a;
  --tda-blue: #88bce8;
  --tda-pink: #f29ac6;
  --tda-violet: #c4b5fd;
  --tda-danger: #f1a2aa;
}

body.tda-notes-page .main {
  max-width: calc(1120px + var(--gap) * 2);
}

body.tda-notes-page .post-single {
  overflow: hidden;
  padding: clamp(1rem, 2vw, 1.4rem);
  position: relative;
}

body.tda-notes-page .post-header {
  margin-bottom: 0.9rem;
}

body.tda-notes-page .post-header .post-title,
body.tda-notes-page .post-header .post-description,
body.tda-notes-page .post-header .post-meta {
  display: none;
}

body.tda-notes-page .post-header .breadcrumbs {
  color: var(--tda-ink-faint);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

body.tda-notes-page .post-content {
  margin: 0;
}

.tda-progress {
  background: rgba(10, 14, 12, 0.84);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  inset: 0 0 auto;
  position: fixed;
  z-index: 40;
}

.tda-progress-bar {
  background: var(--site-accent);
  display: block;
  height: 3px;
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.tda-notebook {
  display: grid;
  gap: 1.35rem;
  position: relative;
}

.tda-notebook::before {
  background-image:
    linear-gradient(var(--tda-grid-minor) 1px, transparent 1px),
    linear-gradient(90deg, var(--tda-grid-minor) 1px, transparent 1px),
    linear-gradient(var(--tda-grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--tda-grid-major) 1px, transparent 1px);
  background-position: 0 0, 0 0, 0 0, 0 0;
  background-size: 28px 28px, 28px 28px, 112px 112px, 112px 112px;
  border-radius: 24px;
  content: "";
  inset: 0;
  opacity: 0.12;
  pointer-events: none;
  position: absolute;
}

.tda-notebook > * {
  position: relative;
  z-index: 1;
}

.tda-hero {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: block;
  padding: 0 0 1.1rem;
}

.tda-hero-copy {
  display: grid;
  gap: 0.8rem;
}

.tda-kicker {
  color: var(--tda-ink-faint);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  margin: 0;
  text-transform: uppercase;
}

.tda-display {
  font-size: clamp(2rem, 5vw, 3.25rem);
  letter-spacing: -0.03em;
  line-height: 0.98;
  margin: 0;
  max-width: 10ch;
}

.tda-hero-intro {
  color: var(--tda-ink);
  margin: 0;
  max-width: 44rem;
}

.tda-hero-meta,
.tda-hero-note {
  color: var(--tda-ink-faint);
  font-size: 0.9rem;
  margin: 0;
  max-width: 42rem;
}

.tda-hero-actions,
.tda-widget-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.tda-button,
.tda-mini-button,
.tda-widget-button {
  align-items: center;
  background: rgba(21, 29, 25, 0.48);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--site-radius-md);
  color: var(--tda-ink);
  cursor: pointer;
  display: inline-flex;
  gap: 0.45rem;
  min-height: 0;
  padding: 0.58rem 0.9rem;
  text-decoration: none;
}

.tda-button:hover,
.tda-mini-button:hover,
.tda-widget-button:hover {
  background: rgba(28, 38, 33, 0.72);
  border-color: rgba(255, 255, 255, 0.13);
  transform: translateY(-1px);
}

.tda-button.is-primary {
  background: rgba(169, 196, 178, 0.12);
  border-color: rgba(169, 196, 178, 0.26);
}

.tda-toc-card,
.tda-callout,
.tda-widget,
.tda-source-drawer,
.tda-figure {
  background: rgba(16, 22, 19, 0.44);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
}

.tda-layout {
  display: grid;
  gap: 1.35rem;
  grid-template-columns: minmax(220px, 248px) minmax(0, 1fr);
}

.tda-sidebar {
  align-self: start;
  position: sticky;
  top: calc(var(--header-height) + 1rem);
}

.tda-toc-card {
  display: grid;
  gap: 0.9rem;
  padding: 0.9rem;
}

.tda-sidebar-label,
.tda-widget-kicker,
.tda-callout-label,
.tda-lecture-meta,
.tda-figure-kicker {
  color: var(--tda-ink-faint);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  margin: 0;
  text-transform: uppercase;
}

.tda-jump {
  display: none;
}

.tda-jump-select,
.tda-slider {
  appearance: none;
  background: rgba(21, 29, 25, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  color: var(--tda-ink);
  padding: 0.65rem 0.8rem;
  width: 100%;
}

.tda-toc-links {
  display: grid;
  gap: 0.35rem;
}

.tda-toc-link {
  border-left: 2px solid transparent;
  color: var(--tda-ink-soft);
  display: block;
  font-size: 0.9rem;
  padding: 0.28rem 0.1rem 0.28rem 0.62rem;
  text-decoration: none;
}

.tda-toc-link:hover,
.tda-toc-link.is-active {
  border-left-color: var(--tda-yellow);
  color: var(--tda-ink);
}

.tda-main {
  display: grid;
  gap: 1.2rem;
}

.tda-mini-button {
  font-size: 0.88rem;
  padding: 0.42rem 0.7rem;
}

.tda-section {
  display: grid;
  gap: 0.9rem;
  padding-top: 1.1rem;
}

.tda-section + .tda-section {
  border-top: 1px dashed rgba(255, 255, 255, 0.1);
}

.tda-section-header {
  display: grid;
  gap: 0.45rem;
}

.tda-section h2,
.tda-section h3,
.tda-section h4 {
  margin: 0;
}

.tda-section h2 {
  font-size: clamp(1.45rem, 3vw, 2.15rem);
  letter-spacing: -0.02em;
}

.tda-section h3 {
  font-size: 1.08rem;
  margin-top: 0.3rem;
}

.tda-section p,
.tda-section li {
  color: var(--tda-ink-soft);
  line-height: 1.82;
}

.tda-section-intro {
  color: var(--tda-ink);
  font-size: 1rem;
  margin: 0;
  max-width: 48rem;
}

.tda-grid-two,
.tda-grid-three {
  display: grid;
  gap: 1rem;
}

.tda-grid-two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tda-grid-three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tda-callout {
  --tda-callout-accent: var(--tda-blue);
  display: grid;
  gap: 0.52rem;
  padding: 0.9rem 0.95rem 0.9rem 1rem;
  position: relative;
}

.tda-callout::before {
  background: var(--tda-callout-accent);
  border-radius: 999px;
  content: "";
  inset: 0.7rem auto 0.7rem 0;
  opacity: 0.8;
  position: absolute;
  width: 2px;
}

.tda-callout.is-definition {
  --tda-callout-accent: var(--tda-yellow);
}

.tda-callout.is-theorem {
  --tda-callout-accent: var(--tda-blue);
}

.tda-callout.is-example {
  --tda-callout-accent: var(--tda-green);
}

.tda-callout.is-remark {
  --tda-callout-accent: var(--tda-pink);
}

.tda-callout.is-intuition {
  --tda-callout-accent: var(--tda-orange);
}

.tda-callout.is-review {
  --tda-callout-accent: var(--tda-danger);
  background: rgba(36, 20, 23, 0.28);
}

.tda-callout-title {
  color: var(--tda-ink);
  font-size: 0.98rem;
}

.tda-callout p:last-child,
.tda-callout ul:last-child,
.tda-callout ol:last-child {
  margin-bottom: 0;
}

.tda-formula {
  background: rgba(12, 17, 15, 0.52);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  overflow-x: auto;
  padding: 0.75rem 0.9rem;
}

.tda-formula p {
  margin: 0;
}

.tda-proof {
  background: rgba(12, 17, 15, 0.38);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 14px;
  overflow: hidden;
}

.tda-proof summary {
  cursor: pointer;
  list-style: none;
  padding: 0.92rem 1rem;
}

.tda-proof summary::-webkit-details-marker {
  display: none;
}

.tda-proof summary::before {
  color: var(--tda-yellow);
  content: "+";
  display: inline-block;
  margin-right: 0.6rem;
}

.tda-proof[open] summary::before {
  content: "−";
}

.tda-proof-body {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 0.95rem 1rem 1.05rem;
}

.tda-proof-body p:first-child {
  margin-top: 0;
}

.tda-figure {
  display: grid;
  gap: 0.7rem;
  margin: 0;
  padding: 0.9rem;
}

.tda-figure svg {
  background: rgba(12, 17, 15, 0.42);
  border-radius: 14px;
  display: block;
  height: auto;
  width: 100%;
}

.tda-figure figcaption {
  color: var(--tda-ink-soft);
  font-size: 0.92rem;
}

.tda-widget {
  display: grid;
  gap: 1rem;
  overflow: hidden;
  padding: 0.9rem;
}

.tda-widget-head {
  align-items: start;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  justify-content: space-between;
}

.tda-widget-head h3 {
  font-size: 1.08rem;
  margin: 0.2rem 0 0;
}

.tda-widget-shell {
  display: grid;
  gap: 1rem;
}

.tda-widget-canvas {
  background: rgba(12, 17, 15, 0.38);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 14px;
  overflow: hidden;
  padding: 0.45rem;
}

.tda-widget-svg {
  display: block;
  height: auto;
  width: 100%;
}

.tda-widget-copy,
.tda-widget-caption {
  color: var(--tda-ink-soft);
  font-size: 0.94rem;
  margin: 0;
}

.tda-widget-button {
  font-size: 0.88rem;
  padding: 0.42rem 0.68rem;
}

.tda-widget-button.is-active {
  background: rgba(169, 196, 178, 0.12);
  border-color: rgba(169, 196, 178, 0.26);
  color: var(--tda-ink);
}

.tda-slider-wrap {
  align-items: center;
  color: var(--tda-ink-soft);
  display: flex;
  gap: 0.7rem;
  min-width: min(100%, 250px);
}

.tda-slider {
  padding: 0.45rem 0.6rem;
}

.tda-slider[type="range"] {
  accent-color: var(--tda-yellow);
  background: transparent;
  border: 0;
  padding: 0;
}

.tda-legend {
  color: var(--tda-ink-faint);
  font-size: 0.86rem;
}

.tda-widget-summary {
  color: var(--tda-ink-soft);
  font-size: 0.95rem;
}

.tda-widget-summary strong {
  color: var(--tda-ink);
}

.tda-source-drawer {
  padding: 0.9rem;
}

.tda-source-drawer summary {
  cursor: pointer;
  list-style: none;
}

.tda-source-drawer summary::-webkit-details-marker {
  display: none;
}

.tda-source-drawer summary::after {
  color: var(--tda-yellow);
  content: "▾";
  float: right;
}

.tda-source-drawer[open] summary::after {
  transform: rotate(180deg);
}

.tda-source-embed {
  margin-top: 0.9rem;
}

.tda-source-embed embed {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  min-height: 720px;
  width: 100%;
}

.tda-svg-point,
.tda-hexagon-point,
.tda-diagram-point {
  fill: var(--tda-paper-strong);
  stroke: var(--tda-ink);
  stroke-width: 1.6;
}

.tda-svg-edge,
.tda-axis-line,
.tda-diagonal-line,
.tda-match-line,
.tda-hexagon-outline,
.tda-stage-marker,
.tda-barcode-line {
  fill: none;
  stroke: rgba(235, 243, 239, 0.9);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tda-svg-edge,
.tda-hexagon-outline {
  stroke-width: 3.2;
}

.tda-axis-line,
.tda-diagonal-line {
  stroke-width: 1.5;
}

.tda-diagonal-line {
  stroke-dasharray: 5 6;
  opacity: 0.72;
}

.tda-match-line {
  stroke: rgba(169, 196, 178, 0.78);
  stroke-dasharray: 8 6;
  stroke-width: 2;
}

.tda-stage-marker {
  stroke: rgba(255, 255, 255, 0.28);
  stroke-dasharray: 4 7;
  stroke-width: 1.5;
}

.tda-barcode-line {
  stroke-width: 5;
}

.tda-svg-face {
  fill: rgba(136, 188, 232, 0.18);
  stroke: transparent;
}

.tda-svg-radius {
  fill: rgba(235, 212, 106, 0.08);
  stroke: rgba(235, 212, 106, 0.24);
  stroke-width: 1.2;
}

.tda-svg-label,
.tda-svg-small-label,
.tda-svg-title {
  fill: var(--tda-ink);
  font-family: var(--site-font-stack);
}

.tda-svg-label {
  font-size: 12px;
}

.tda-svg-small-label {
  fill: var(--tda-ink-soft);
  font-size: 11px;
}

.tda-svg-title {
  font-size: 14px;
  font-weight: 700;
}

.is-muted {
  opacity: 0.44;
}

.is-offset {
  fill-opacity: 0.08;
}

.is-dashed {
  stroke-dasharray: 7 6;
}

.is-strong {
  stroke: rgba(255, 255, 255, 0.88);
}

.is-yellow {
  fill: rgba(235, 212, 106, 0.16);
  stroke: rgba(235, 212, 106, 0.92);
}

.is-blue {
  fill: rgba(136, 188, 232, 0.14);
  stroke: rgba(136, 188, 232, 0.94);
}

.is-green {
  fill: rgba(139, 197, 138, 0.16);
  stroke: rgba(139, 197, 138, 0.94);
}

.is-orange {
  fill: rgba(241, 157, 92, 0.16);
  stroke: rgba(241, 157, 92, 0.95);
}

.is-pink {
  fill: rgba(242, 154, 198, 0.18);
  stroke: rgba(242, 154, 198, 0.95);
}

.tda-hexagon-outline.is-blue,
.tda-diagram-point.is-blue,
.tda-barcode-line.is-blue {
  stroke: rgba(136, 188, 232, 0.94);
  fill: rgba(136, 188, 232, 0.16);
}

.tda-hexagon-outline.is-yellow,
.tda-diagram-point.is-yellow,
.tda-barcode-line.is-yellow {
  stroke: rgba(235, 212, 106, 0.95);
  fill: rgba(235, 212, 106, 0.16);
}

.tda-hexagon-outline.is-green,
.tda-diagram-point.is-green,
.tda-barcode-line.is-green {
  stroke: rgba(139, 197, 138, 0.94);
  fill: rgba(139, 197, 138, 0.16);
}

.tda-hexagon-outline.is-orange,
.tda-diagram-point.is-orange,
.tda-barcode-line.is-orange {
  stroke: rgba(241, 157, 92, 0.95);
  fill: rgba(241, 157, 92, 0.16);
}

.tda-hexagon-outline.is-pink,
.tda-diagram-point.is-pink,
.tda-barcode-line.is-pink {
  stroke: rgba(242, 154, 198, 0.95);
  fill: rgba(242, 154, 198, 0.16);
}

@media (max-width: 1080px) {
  .tda-layout {
    grid-template-columns: 1fr;
  }

  .tda-sidebar {
    display: none;
  }

  .tda-jump {
    display: block;
  }
}

@media (max-width: 840px) {
  .tda-grid-two,
  .tda-grid-three {
    grid-template-columns: 1fr;
  }

  .tda-source-embed embed {
    min-height: 520px;
  }
}

@media (max-width: 680px) {
  body.tda-notes-page .post-single {
    padding: 0.9rem;
  }

  .tda-hero,
  .tda-toc-card,
  .tda-callout,
  .tda-widget,
  .tda-source-drawer,
  .tda-figure {
    border-radius: 14px;
  }

  .tda-widget-canvas {
    padding: 0.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tda-button,
  .tda-mini-button,
  .tda-widget-button,
  .tda-toc-link {
    transition: none;
  }
}