/* CSS Variables based on Design System */
:root {
  /* Colors */
  --color-background: #0b1326;
  --color-on-background: #dae2fd;
  --color-surface: #0b1326;
  --color-surface-dim: #0b1326;
  --color-surface-bright: #31394d;
  --color-surface-container-lowest: #060e20;
  --color-surface-container-low: #131b2e;
  --color-surface-container: #171f33;
  --color-surface-container-high: #222a3d;
  --color-surface-container-highest: #2d3449;
  --color-surface-variant: #2d3449;
  --color-on-surface: #dae2fd;
  --color-on-surface-variant: #b9cacb;
  --color-primary: #dbfcff;
  --color-on-primary: #00363a;
  --color-primary-container: #00f0ff;
  --color-on-primary-container: #006970;
  --color-outline: #849495;
  --color-outline-variant: #3b494b;
  --surface: #0b1326;
  --surface-lowest: #060e20;
  --surface-low: #131b2e;
  --surface-bright: #31394d;
  --surface-card: #0e172e;
  --surface-border: #1e293b;
  --surface-border-subtle: #25334d;
  --surface-card-hover: #15223e;
  --primary: #00f0ff;
  --primary-dim: rgba(0, 240, 255, 0.15);
  --secondary: #ffb4ab;
  --secondary-dim: rgba(255, 180, 171, 0.15);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --on-surface: #e2e8f0;
  --on-surface-muted: #94a3b8;
  --outline: #1e293b;
  --outline-variant: #334155;
  --outline-cyan: rgba(0, 240, 255, 0.3);
  --text-dim: #64748b;
  --font-main: 'Geist', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Geist Mono', monospace;

  /* Typography */
  --font-display-lg: "Geist", sans-serif;
  --font-headline-lg: "Geist", sans-serif;
  --font-body-md: "Inter", sans-serif;
  --font-label-caps: "JetBrains Mono", monospace;
  --font-data-mono: "JetBrains Mono", monospace;
  --font-geist: "Geist", sans-serif;
  --font-inter: "Inter", sans-serif;

  /* Spacing */
  --spacing-unit: 4px;
  --spacing-stack-compact: 8px;
  --spacing-gutter: 24px;
  --spacing-stack-loose: 32px;
  --spacing-margin-page: 48px;
  --spacing-container-max: 1440px;

  /* Border Radius */
  --radius-default: 0.25rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 9999px;
}

/* Base Styles */
body {
  background-color: var(--color-background);
  color: var(--color-on-background);
  font-family: var(--font-body-md);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  margin: 0;
}

::selection {
  background-color: var(--color-primary-container);
  color: var(--color-on-primary-container);
}

a {
  text-decoration: none;
}
button {
  cursor: pointer;
  border: none;
  font-family: inherit;
}

/* Typography Classes */
.text-display-lg {
  font-family: var(--font-display-lg);
  font-size: 48px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 600;
}

.text-headline-lg {
  font-family: var(--font-headline-lg);
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 500;
}

.text-body-md {
  font-family: var(--font-body-md);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
}

.text-label-caps {
  font-family: var(--font-label-caps);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.1em;
  font-weight: 500;
  text-transform: uppercase;
}

.text-data-mono {
  font-family: var(--font-data-mono);
  font-size: 14px;
  line-height: 1.4;
  font-weight: 400;
}

/* Layout Helpers */
.container {
  max-width: var(--spacing-container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-margin-page);
  padding-right: var(--spacing-margin-page);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--spacing-gutter);
}

@media (max-width: 768px) {
  .grid-12 {
    grid-template-columns: 1fr;
  }
  .md-hidden {
    display: none;
  }
  .md-flex {
    display: flex;
  }
}

/* Header */
.site-header {
  background-color: var(--color-surface);
  color: var(--color-primary);
  position: sticky;
  top: 0;
  width: 100%;
  border-bottom: 1px solid var(--color-outline-variant);
  z-index: 50;
}

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

.logo {
  font-weight: bold;
  letter-spacing: 0.2em;
}

.main-nav {
  display: none;
  gap: var(--spacing-gutter);
  align-items: center;
  height: 100%;
}
@media (min-width: 768px) {
  .main-nav {
    display: flex;
  }
}

.nav-link {
  height: 100%;
  display: flex;
  align-items: center;
  color: var(--color-on-surface-variant);
  font-weight: 500;
  transition: color 0.2s;
}
.nav-link:hover {
  color: var(--color-primary);
}
.nav-link.active {
  color: var(--color-primary);
  font-weight: bold;
  border-bottom: 1px solid var(--color-primary);
  padding-bottom: 4px;
  opacity: 0.8;
}

.btn-contact {
  background-color: var(--color-primary-container);
  color: var(--color-surface);
  padding: 8px 24px;
  transition: opacity 0.2s;
}
.btn-contact:hover {
  opacity: 0.9;
}

/* Hero Section */
.hero-section {
  position: relative;
  width: 100%;
  min-height: 80vh;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--color-outline-variant);
}

.hero-background {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.4;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  mix-blend-mode: luminosity;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    var(--color-background),
    rgba(11, 19, 38, 0.9),
    rgba(11, 19, 38, 0.2)
  );
}

.grid-baseline {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
    to bottom,
    rgba(59, 73, 75, 0.2) 1px,
    transparent 1px
  );
  background-size: 100% 4px;
}

.hero-content {
  position: relative;
  z-index: 10;
  width: 100%;
}

.hero-text-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-stack-loose);
  grid-column: span 8;
}
@media (min-width: 1024px) {
  .hero-text-wrapper {
    grid-column: span 7;
  }
}

.hero-title {
  color: var(--color-primary);
  margin: 0;
}

.hero-description {
  color: var(--color-on-surface-variant);
  max-width: 36rem;
  margin: 0;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-gutter);
  margin-top: var(--spacing-stack-compact);
}

.btn-primary {
  background-color: var(--color-primary-container);
  color: var(--color-surface);
  padding: 12px 32px;
  border: 1px solid var(--color-primary-container);
  transition: background-color 0.2s;
}
.btn-primary:hover {
  background-color: var(--color-primary);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  padding: 12px 32px;
  border: 1px solid var(--color-primary);
  transition: background-color 0.2s;
}
.btn-secondary:hover {
  background-color: rgba(219, 252, 255, 0.1);
}

/* Section Styles */
.section-padding {
  padding-top: 96px;
  padding-bottom: 96px;
  border-bottom: 1px solid var(--color-outline-variant);
}
.bg-lowest {
  background-color: var(--color-surface-container-lowest);
}

.section-header {
  grid-column: span 12;
  border-top: 1px solid var(--color-outline-variant);
  padding-top: var(--spacing-stack-compact);
}
@media (min-width: 768px) {
  .section-header.col-4 {
    grid-column: span 4;
  }
}

.section-label {
  color: var(--color-primary);
  margin-bottom: var(--spacing-stack-compact);
  margin-top: 0;
}
.section-title {
  color: var(--color-on-surface);
  margin: 0;
}

.section-content {
  grid-column: span 12;
  border-top: 1px solid var(--color-outline-variant);
  padding-top: var(--spacing-stack-compact);
}
@media (min-width: 768px) {
  .section-content.col-8 {
    grid-column: span 8;
  }
}

.section-text {
  color: var(--color-on-surface-variant);
  margin-bottom: var(--spacing-stack-loose);
  margin-top: 0;
}
.section-text.flex-col {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-stack-loose);
  margin-bottom: 0;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-gutter);
}
@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background-color: var(--color-surface-container);
  border: 1px solid var(--color-outline-variant);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  box-sizing: border-box;
}

.card-label {
  color: var(--color-on-surface-variant);
  margin-bottom: 16px;
}
.card-value {
  color: var(--color-primary);
}

/* Image Box */
.image-box {
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--color-outline-variant);
}

.image-box-img {
  background-size: cover;
  background-position: center;
  width: 100%;
  height: 256px;
  filter: grayscale(100%) contrast(125%) brightness(75%);
}

.image-box-footer {
  border-top: 1px solid var(--color-outline-variant);
  padding: 8px;
  background-color: var(--color-surface-container);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.image-box-footer span:first-child {
  color: var(--color-on-surface-variant);
}
.image-box-footer span:last-child {
  color: var(--color-primary);
}

/* Table */
.table-container {
  width: 100%;
  border: 1px solid var(--color-outline-variant);
  background-color: var(--color-surface-container);
}

.table-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-outline-variant);
}
.table-row:last-child {
  border-bottom: none;
}
.table-header {
  background-color: var(--color-surface);
}
.table-row.hoverable:hover {
  background-color: var(--color-surface-variant);
  transition: background-color 0.2s;
  cursor: default;
}

.col-span-2 {
  grid-column: span 2;
}
.text-right {
  text-align: right;
}

.table-header .text-label-caps {
  color: var(--color-on-surface-variant);
}
.table-row .text-data-mono:first-child {
  color: var(--color-on-surface);
}
.table-row .text-data-mono:nth-child(2) {
  color: var(--color-primary);
}
.table-row .text-data-mono:last-child {
  color: var(--color-on-surface-variant);
}
.table-row .status-text {
  color: var(--color-primary);
}

/* Footer */
.site-footer {
  background-color: var(--color-surface-container);
  border-top: 1px solid var(--color-outline-variant);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-gutter);
  padding-top: 10px;
  padding-bottom: 10px;
}
@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-stack-compact);
}
.footer-brand span:first-child {
  color: var(--color-on-surface);
}
.footer-brand span:last-child {
  color: var(--color-on-surface-variant);
}

.footer-links-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-stack-loose);
}
@media (min-width: 768px) {
  .footer-links-container {
    flex-direction: row;
    justify-content: flex-end;
    gap: var(--spacing-gutter);
  }
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-stack-compact);
}
@media (min-width: 768px) {
  .footer-nav {
    flex-direction: row;
    gap: var(--spacing-gutter);
  }
}

.footer-link {
  color: var(--color-on-surface-variant);
  transition: color 0.2s;
}
.footer-link:hover {
  color: var(--color-on-surface);
}

/* Theory  */
    .hero-title-t {
      font-size: 42px;
      font-weight: 600;
      letter-spacing: -0.02em;
      color: #ffffff;
      line-height: 1.15;
      margin-bottom: 16px;
    }

    .hero-subtitle-t {
      font-size: 17px;
      color: var(--text-muted);
      max-width: 820px;
      line-height: 1.6;
    }

    /* Section structure */
    .section-block-t {
      margin-bottom: 88px;
    }

    .section-header-t {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      border-bottom: 1px solid var(--surface-border);
      padding-bottom: 18px;
      margin-bottom: 32px;
    }

    .section-label-group-t {
      display: flex;
      align-items: baseline;
      gap: 16px;
    }

    .section-number-t {
      font-family: var(--font-mono);
      font-size: 12px;
      letter-spacing: 0.2em;
      color: var(--primary);
      font-weight: 600;
    }

    .section-title-t {
      font-size: 26px;
      font-weight: 600;
      letter-spacing: -0.01em;
      color: #ffffff;
    }

    .section-status-t {
      font-family: var(--font-mono);
      font-size: 11px;
      letter-spacing: 0.15em;
      color: var(--text-dim);
      text-transform: uppercase;
    }

    .section-lead-t {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 960px;
      margin-bottom: 36px;
      line-height: 1.7;
    }

    /* Dual column technical card layout */
    .grid-2-t {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
      margin-bottom: 32px;
    }

    .grid-3-t {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 32px;
    }

    .tech-card-t {
      background: var(--surface-card);
      border: 1px solid var(--surface-border);
      border-radius: 4px;
      padding: 24px 28px;
      position: relative;
    }

    .tech-card.highlight-t {
      border-color: rgba(0, 240, 255, 0.35);
      background: linear-gradient(180deg, rgba(0, 240, 255, 0.03) 0%, rgba(14, 23, 46, 0.8) 100%);
    }

    .card-label-t {
      font-family: var(--font-mono);
      font-size: 10px;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .card-title-t {
      font-size: 18px;
      font-weight: 600;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .card-text-t {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* Mathematical / formula badge */
    .formula-box-t {
      background: var(--surface-lowest);
      border: 1px solid var(--surface-border-subtle);
      border-left: 3px solid var(--primary);
      padding: 16px 20px;
      font-family: var(--font-mono);
      font-size: 13px;
      color: #e2e8f0;
      margin: 18px 0;
      border-radius: 2px;
      overflow-x: auto;
    }

    .formula-box-t.secondary-accent {
      border-left-color: var(--secondary);
    }

    .formula-caption-t {
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--text-dim);
      margin-top: 6px;
    }

    /* Metric & Spec table */
    .spec-table-t {
      width: 100%;
      border-collapse: collapse;
      font-size: 13px;
      margin: 20px 0;
      background: var(--surface-card);
      border: 1px solid var(--surface-border);
      border-radius: 4px;
      overflow: hidden;
    }

    .spec-table-t th {
      background: var(--surface-lowest);
      font-family: var(--font-mono);
      font-size: 11px;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      color: var(--text-dim);
      padding: 12px 18px;
      text-align: left;
      border-bottom: 1px solid var(--surface-border);
    }

    .spec-table-t td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--surface-border);
      color: var(--text-muted);
    }

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

    .spec-table-t td.code-cell {
      font-family: var(--font-mono);
      color: var(--primary);
      font-size: 12px;
    }

    .spec-table-t td.sec-code-cell {
      font-family: var(--font-mono);
      color: var(--secondary);
      font-size: 12px;
    }

    .spec-table-t td.bold-cell {
      color: #ffffff;
      font-weight: 500;
    }

    /* Diagram visual representations (Pure CSS) */
    .schematic-diagram-t {
      background: var(--surface-lowest);
      border: 1px solid var(--surface-border);
      border-radius: 4px;
      padding: 24px;
      margin: 24px 0 32px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .diagram-header-t {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid var(--surface-border-subtle);
      padding-bottom: 12px;
    }

    .diagram-title-t {
      font-family: var(--font-mono);
      font-size: 11px;
      letter-spacing: 0.15em;
      color: var(--text-muted);
      text-transform: uppercase;
    }

    .pipeline-row-t {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      position: relative;
    }

    .pipeline-step-t {
      background: var(--surface-low);
      border: 1px solid var(--surface-border-subtle);
      padding: 16px;
      border-radius: 2px;
      position: relative;
    }

    .pipeline-step-t::after {
      content: '→';
      position: absolute;
      right: -12px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--primary);
      font-family: var(--font-mono);
      font-size: 16px;
      z-index: 2;
    }

    .pipeline-step-t:last-child::after {
      display: none;
    }

    .step-tag-t {
      font-family: var(--font-mono);
      font-size: 10px;
      color: var(--primary);
      margin-bottom: 6px;
      display: block;
    }

    .step-title-t {
      font-size: 13px;
      font-weight: 600;
      color: #ffffff;
      margin-bottom: 4px;
    }

    .step-desc-t {
      font-size: 11px;
      color: var(--text-dim);
      line-height: 1.4;
    }

    /* Film Stack Visualization Pure CSS */
    .film-stack-container-t {
      background: var(--surface-lowest);
      border: 1px solid var(--surface-border);
      border-radius: 4px;
      padding: 24px;
      margin: 24px 0;
      display: grid;
      grid-template-columns: 240px 1fr;
      gap: 28px;
      align-items: center;
    }

    .film-stack-visual-t {
      display: flex;
      flex-direction: column;
      gap: 4px;
      background: #040914;
      padding: 16px;
      border: 1px solid var(--surface-border-subtle);
      border-radius: 2px;
    }

    .film-layer-t {
      height: 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 10px;
      font-family: var(--font-mono);
      font-size: 10px;
      border-radius: 1px;
    }

    .layer-substrate-t {
      background: #1e293b;
      color: #94a3b8;
      border-top: 1px dashed #475569;
    }

    .layer-high-n-t {
      background: rgba(0, 240, 255, 0.25);
      border: 1px solid rgba(0, 240, 255, 0.6);
      color: #00f0ff;
    }

    .layer-low-n-t {
      background: rgba(255, 180, 171, 0.2);
      border: 1px solid rgba(255, 180, 171, 0.6);
      color: #ffb4ab;
    }

    .layer-ambient-t {
      background: transparent;
      border-bottom: 1px dashed #475569;
      color: #64748b;
    }

    .film-stack-notes-t {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .film-note-item-t {
      display: flex;
      gap: 12px;
      font-size: 13px;
      color: var(--text-muted);
    }

    .note-marker-t {
      width: 12px;
      height: 12px;
      border-radius: 2px;
      margin-top: 3px;
      flex-shrink: 0;
    }

    .marker-cyan-t {
      background: var(--primary);
    }

    .marker-pink-t {
      background: var(--secondary);
    }

    .marker-gray-t {
      background: #475569;
    }

    /* Key chart breakdown chips */
    .chart-pill-grid-t {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 12px;
      margin-top: 20px;
    }

    .chart-pill-t {
      background: var(--surface-lowest);
      border: 1px solid var(--surface-border);
      padding: 14px;
      border-radius: 3px;
    }

    .chart-pill-code-t {
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .chart-pill-name-t {
      font-size: 12px;
      font-weight: 500;
      color: #ffffff;
      margin-bottom: 6px;
    }

    .chart-pill-desc-t {
      font-size: 11px;
      color: var(--text-dim);
      line-height: 1.4;
    }

        /* Page container */
    .page-container {
      max-width: 1360px;
      margin: 0 auto;
      padding: 56px 32px 96px;
    }

/* --------------------- about ------------------ */

/* Page Container */
    .page-main-a {
      flex: 1;
      max-width: 1280px;
      width: 100%;
      margin: 0 auto;
      padding: 64px 32px 100px;
    }

    /* Hero Banner */
    .hero-kicker-a {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 600;
      color: var(--primary);
      letter-spacing: 0.2em;
      text-transform: uppercase;
      padding: 6px 14px;
      background: rgba(0, 240, 255, 0.06);
      border: 1px solid var(--outline-cyan);
      margin-bottom: 24px;
    }

    .hero-title-a {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: #ffffff;
      line-height: 1.15;
      margin-bottom: 18px;
    }

    .hero-subtitle-a {
      font-size: 17px;
      color: var(--on-surface-muted);
      max-width: 860px;
      line-height: 1.65;
      margin-bottom: 48px;
    }

    /* Quick Specs Strip */
    .spec-strip-a {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-bottom: 64px;
      background: var(--surface-card);
      border: 1px solid var(--outline);
      padding: 24px 28px;
    }

    .spec-item-a {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .spec-label-a {
      font-family: var(--font-mono);
      font-size: 11px;
      letter-spacing: 0.15em;
      color: var(--on-surface-muted);
      text-transform: uppercase;
    }

    .spec-value-a {
      font-family: var(--font-mono);
      font-size: 14px;
      font-weight: 600;
      color: #ffffff;
    }

    .spec-value-a.cyan {
      color: var(--primary);
    }

    /* Section Structural Headers */
    .section-header-a {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      border-bottom: 1px solid var(--outline);
      padding-bottom: 14px;
      margin-top: 60px;
      margin-bottom: 32px;
    }

    .section-title-wrap-a {
      display: flex;
      align-items: baseline;
      gap: 14px;
    }

    .section-num-a {
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.15em;
    }

    .section-tag-a {
      font-family: var(--font-mono);
      font-size: 12px;
      color: var(--on-surface-muted);
      letter-spacing: 0.18em;
    }

    .section-title-a {
      font-size: 24px;
      font-weight: 600;
      color: #ffffff;
      letter-spacing: -0.01em;
    }

    .section-context-a {
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--on-surface-muted);
      letter-spacing: 0.15em;
      text-transform: uppercase;
    }

    /* Section 1: Life & Passions Grid */
    .bio-grid-a {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 28px;
    }

    .bio-card-a {
      background: var(--surface-card);
      border: 1px solid var(--outline);
      padding: 32px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .bio-card-a.accent-border {
      border-left: 3px solid var(--primary);
    }

    .card-kicker-a {
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 600;
      color: var(--primary);
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }

    .card-heading-a {
      font-size: 20px;
      font-weight: 600;
      color: #ffffff;
      line-height: 1.35;
    }

    .card-body-a {
      font-size: 14px;
      color: var(--on-surface-muted);
      line-height: 1.7;
    }

    .card-body-a p + p {
      margin-top: 14px;
    }

    .passion-stack-a {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .passion-card-a {
      background: var(--surface-card);
      border: 1px solid var(--outline);
      padding: 24px 28px;
    }

    .passion-header-a {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
    }

    .passion-title-a {
      font-size: 16px;
      font-weight: 600;
      color: #ffffff;
    }

    .badge-subtle-a {
      font-family: var(--font-mono);
      font-size: 11px;
      padding: 3px 8px;
      border: 1px solid var(--outline-variant);
      color: var(--secondary);
      background: rgba(255, 180, 171, 0.05);
    }

    .badge-subtle-a.cyan {
      color: var(--primary);
      border-color: var(--outline-cyan);
      background: rgba(0, 240, 255, 0.05);
    }

    .passion-desc-a {
      font-size: 13.5px;
      color: var(--on-surface-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .tech-pill-list-a {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .tech-pill-a {
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--on-surface);
      background: var(--surface-lowest);
      border: 1px solid var(--outline);
      padding: 4px 10px;
    }

    /* Section 2: Academic Degrees */
    .degree-timeline-a {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .degree-card-a {
      background: var(--surface-card);
      border: 1px solid var(--outline);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }

    .degree-card-a.phd-card {
      border-top: 3px solid var(--primary);
      background: linear-gradient(180deg, rgba(0, 240, 255, 0.03) 0%, var(--surface-card) 100%);
    }

    .degree-level-badge-a {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
    }

    .degree-tag-a {
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.15em;
    }

    .degree-years-a {
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--on-surface-muted);
    }

    .degree-title-a {
      font-size: 18px;
      font-weight: 600;
      color: #ffffff;
      line-height: 1.35;
      margin-bottom: 8px;
    }

    .degree-institution-a {
      font-family: var(--font-mono);
      font-size: 13px;
      color: var(--secondary);
      margin-bottom: 16px;
    }

    .degree-details-a {
      border-top: 1px solid var(--outline);
      padding-top: 16px;
      font-size: 13px;
      color: var(--on-surface-muted);
      line-height: 1.6;
    }

    .degree-focus-label-a {
      font-family: var(--font-mono);
      font-size: 10px;
      text-transform: uppercase;
      letter-spacing: 0.15em;
      color: var(--on-surface);
      margin-bottom: 6px;
    }

    /* Section 3: Dissertation Spotlight */
    .dissertation-box-a {
      background: var(--surface-lowest);
      border: 1px solid var(--outline-cyan);
      padding: 32px;
      margin-bottom: 36px;
      position: relative;
    }

    .dissertation-header-a {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 16px;
      border-bottom: 1px solid var(--outline);
      padding-bottom: 12px;
    }

    .dissertation-badge-a {
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.2em;
      color: var(--primary);
      text-transform: uppercase;
    }

    .dissertation-meta-a {
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--on-surface-muted);
    }

    .dissertation-title-a {
      font-size: 20px;
      font-weight: 600;
      color: #ffffff;
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .dissertation-abstract-a {
      font-size: 14px;
      color: var(--on-surface-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .dissertation-cite-block-a {
      background: var(--surface-card);
      border: 1px solid var(--outline);
      padding: 16px 20px;
      font-family: var(--font-mono);
      font-size: 12px;
      color: #cbd5e1;
      line-height: 1.6;
    }

    .cite-label-a {
      color: var(--primary);
      margin-bottom: 4px;
      display: block;
      font-weight: 600;
      font-size: 11px;
      letter-spacing: 0.1em;
    }

    /* Publication Citation Cards */
    .citations-list-a {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .paper-card-a {
      background: var(--surface-card);
      border: 1px solid var(--outline);
      padding: 24px 28px;
      display: grid;
      grid-template-columns: 90px 1fr auto;
      align-items: center;
      gap: 24px;
      transition: border-color 0.2s ease, background-color 0.2s ease;
    }

    .paper-card-a:hover {
      border-color: var(--outline-cyan);
      background: var(--surface-card-hover);
    }

    .paper-index-a {
      font-family: var(--font-mono);
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.12em;
    }

    .paper-content-a {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .paper-title-a {
      font-size: 16px;
      font-weight: 600;
      color: #ffffff;
      line-height: 1.35;
    }

    .paper-authors-a {
      font-size: 13px;
      color: var(--on-surface-muted);
    }

    .paper-authors-a strong {
      color: var(--on-surface);
      font-weight: 600;
    }

    .paper-journal-a {
      font-family: var(--font-mono);
      font-size: 12px;
      color: var(--secondary);
    }

    .paper-meta-right-a {
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      gap: 8px;
    }

    .paper-type-tag-a {
      font-family: var(--font-mono);
      font-size: 11px;
      padding: 4px 10px;
      background: var(--surface-lowest);
      border: 1px solid var(--outline);
      color: var(--on-surface-muted);
      text-transform: uppercase;
      letter-spacing: 0.1em;
    }

    .paper-doi-a {
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--primary);
      text-decoration: none;
    }

    .paper-doi-a:hover {
      text-decoration: underline;
    }