@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&family=Newsreader:ital,opsz,wght@0,6..72,300;0,6..72,400;0,6..72,500;1,6..72,400&display=swap');

/* ============================================================================
   GOOGLE DEEPMIND — AGI DAWN ECONOMICS LAB
   SUPER-MINIMALIST EDITION (4 Quiet Architectural Variations)
   ============================================================================ */

:root,
[data-design="monograph"] {
  --bg: #FAF8F5;
  --bg-hover: rgba(17, 17, 17, 0.025);
  --text: #141413;
  --text-secondary: #575653;
  --text-muted: #8C8A84;
  --accent: #141413;
  --rule: rgba(20, 20, 19, 0.1);
  --rule-strong: rgba(20, 20, 19, 0.22);
  --font-heading: 'Newsreader', Georgia, serif;
  --font-body: 'Newsreader', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --container-width: 760px;
  --body-size: 1.08rem;
  --portrait-filter: grayscale(15%);
  --portrait-radius: 50%;
}

/* VARIATION II: SWISS TYPOGRAPHIC INDEX (Pure White, Sans-Serif Tabular) */
[data-design="index"] {
  --bg: #FFFFFF;
  --bg-hover: #F7F7F8;
  --text: #09090B;
  --text-secondary: #52525B;
  --text-muted: #A1A1AA;
  --accent: #09090B;
  --rule: #E4E4E7;
  --rule-strong: #18181B;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --container-width: 920px;
  --body-size: 0.95rem;
  --portrait-filter: grayscale(100%) contrast(1.05);
  --portrait-radius: 4px;
}

/* VARIATION III: SPLIT-SPINE ARCHITECTURAL DIRECTORY (Sticky Left Rail) */
[data-design="split"] {
  --bg: #F6F5F2;
  --bg-hover: rgba(0, 0, 0, 0.03);
  --text: #111110;
  --text-secondary: #555450;
  --text-muted: #8E8D87;
  --accent: #111110;
  --rule: rgba(17, 17, 16, 0.09);
  --rule-strong: rgba(17, 17, 16, 0.85);
  --font-heading: 'Instrument Serif', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --container-width: 1080px;
  --body-size: 0.95rem;
  --portrait-filter: grayscale(25%);
  --portrait-radius: 6px;
}

/* VARIATION IV: OBSIDIAN QUIET (Minimal Matte Charcoal) */
[data-design="obsidian"] {
  --bg: #0E0F11;
  --bg-hover: rgba(255, 255, 255, 0.03);
  --text: #ECECEE;
  --text-secondary: #94969C;
  --text-muted: #5E6068;
  --accent: #ECECEE;
  --rule: rgba(255, 255, 255, 0.08);
  --rule-strong: rgba(255, 255, 255, 0.22);
  --font-heading: 'Newsreader', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --container-width: 780px;
  --body-size: 0.96rem;
  --portrait-filter: grayscale(20%) brightness(0.95);
  --portrait-radius: 50%;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--body-size);
  line-height: 1.65;
  transition: background-color 0.25s ease, color 0.25s ease;
  padding-bottom: 6rem;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ============================================================================
   WHISPER-QUIET MINIMAL THEME SWITCHER (Top Right Pill)
   ============================================================================ */
.minimal-switcher {
  position: fixed;
  top: 1.25rem;
  right: 1.5rem;
  z-index: 100;
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  background: var(--bg);
  border: 1px solid var(--rule-strong);
  padding: 0.25rem;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.switch-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 400;
  padding: 0.28rem 0.65rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.switch-btn:hover {
  color: var(--text);
}

.switch-btn.active {
  background: var(--text);
  color: var(--bg);
  font-weight: 500;
}

/* ============================================================================
   LAYOUT CONTAINER & SPLIT-SPINE ARCHITECTURE
   ============================================================================ */
.page-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 5.5rem 2rem 2rem;
}

[data-design="split"] .page-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 4.5rem;
  align-items: start;
  padding-top: 4.5rem;
}

/* ============================================================================
   HEADER / INTRO
   ============================================================================ */
.site-intro {
  margin-bottom: 4.5rem;
}

.lab-title,
.person-name,
.writing-title {
  font-optical-sizing: auto;
  font-feature-settings: "kern" 1, "liga" 1;
}

.minimal-switcher {
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

[data-design="split"] .site-intro {
  position: sticky;
  top: 4.5rem;
  margin-bottom: 0;
  padding-right: 2.25rem;
  border-right: 1px solid var(--rule);
}

.institution-kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: block;
}

.lab-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin-bottom: 1.25rem;
}

[data-design="index"] .lab-title {
  font-weight: 500;
  letter-spacing: -0.035em;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
}

[data-design="split"] .lab-title {
  font-size: 2.35rem;
}

.lab-lede {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.68;
  max-width: 62ch;
  font-weight: 400;
}

[data-design="index"] .lab-lede,
[data-design="split"] .lab-lede {
  font-size: 0.94rem;
  line-height: 1.65;
}

.minimal-nav {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

[data-design="split"] .minimal-nav {
  flex-direction: column;
  gap: 0.65rem;
}

.minimal-nav a {
  transition: color 0.15s ease;
}

.minimal-nav a:hover {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.nav-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-right: 0.35rem;
}

/* ============================================================================
   SECTIONS
   ============================================================================ */
.minimal-section {
  margin-bottom: 5rem;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--rule-strong);
  margin-bottom: 1.5rem;
}

.section-label {
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text);
}

.section-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ============================================================================
   1. PEOPLE (Clean Minimalist 2x2 Roster)
   ============================================================================ */
.people-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem 2.5rem;
}

.person-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: opacity 0.2s ease;
}

.person-row.dimmed {
  opacity: 0.4;
}

.person-avatar {
  width: 52px;
  height: 52px;
  border-radius: var(--portrait-radius);
  object-fit: cover;
  filter: var(--portrait-filter);
  flex-shrink: 0;
  margin-top: 0.15rem;
  transition: filter 0.2s ease;
}

.person-row:hover .person-avatar {
  filter: grayscale(0%);
}

.person-info {
  flex: 1;
  min-width: 0;
}

.person-name-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.person-name {
  font-family: var(--font-heading);
  font-size: 1.12rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
}

[data-design="index"] .person-name {
  font-size: 0.96rem;
  font-weight: 600;
}

.person-name:hover,
.person-row.active-author .person-name {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.person-links {
  font-family: var(--font-sans);
  font-size: 0.74rem;
  color: var(--text-muted);
  display: flex;
  gap: 0.65rem;
}

.person-links a:hover {
  color: var(--text);
  text-decoration: underline;
}

.person-role {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 0.1rem;
  line-height: 1.45;
}

.collaborators-line {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.collaborators-line strong {
  color: var(--text);
  font-weight: 500;
}

/* ============================================================================
   AUTHOR FILTER INDICATOR (Minimal inline bar when clicked)
   ============================================================================ */
.filter-indicator {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.85rem;
  margin-bottom: 2rem;
  border: 1px solid var(--rule-strong);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.filter-indicator.visible {
  display: flex;
}

.filter-clear-btn {
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text);
  text-decoration: underline;
  cursor: pointer;
}

/* ============================================================================
   2, 3, 4. PAPERS & WRITINGS TABLE (Strict 3-Column Alignment: Title | Authors | Topic)
   ============================================================================ */
.topic-filter-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 2.5rem;
}

.topic-filter-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-right: 0.35rem;
}

.topic-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--rule-strong);
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.15s ease;
}

.topic-tag:hover {
  color: var(--text);
  border-color: var(--text);
}

.topic-tag.active-topic {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.writing-table-head {
  display: grid;
  gap: 1.25rem;
  padding: 0 0.5rem 0.5rem;
  margin: 0 -0.5rem;
  border-bottom: 1px solid var(--rule-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.papers-grid {
  grid-template-columns: minmax(0, 48%) minmax(0, 33%) minmax(0, 19%);
}

.essays-grid {
  grid-template-columns: minmax(0, 43%) minmax(0, 23%) minmax(0, 15%) minmax(0, 19%);
}

.writing-table-head > div:last-child {
  text-align: right;
}

.writing-list {
  display: flex;
  flex-direction: column;
}

.writing-row {
  padding: 0.95rem 0.5rem;
  margin: 0 -0.5rem;
  border-bottom: 1px solid var(--rule);
  border-radius: 3px;
  transition: background-color 0.15s ease;
}

.writing-row:hover {
  background-color: var(--bg-hover);
}

.writing-main {
  display: grid;
  gap: 1.25rem;
  align-items: baseline;
  cursor: pointer;
}

.writing-title {
  font-family: var(--font-heading);
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.4;
}

[data-design="monograph"] .writing-title,
[data-design="obsidian"] .writing-title {
  font-size: 1.06rem;
  font-weight: 400;
}

[data-design="split"] .writing-title {
  font-size: 1.16rem;
  line-height: 1.3;
}

.writing-row:hover .writing-title {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.writing-authors,
.writing-outlet {
  font-family: var(--font-sans);
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.writing-outlet {
  color: var(--text-muted);
}

.writing-topic-cell {
  text-align: right;
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

/* Quiet Literary Margin-Rule Drawer for Abstract & Direct Link */
.writing-drawer {
  display: none;
  margin: 0.85rem 0 0.25rem 0.15rem;
  padding: 0.1rem 0 0.15rem 1rem;
  border-left: 1.5px solid var(--rule-strong);
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 68ch;
  line-height: 1.65;
}

.writing-row.expanded .writing-drawer {
  display: block;
}

.drawer-links {
  margin-top: 0.65rem;
  display: flex;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.73rem;
}

.drawer-links a,
.drawer-links button {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

/* ============================================================================
   MICRO-EDIT MODE (Inline ContentEditable & Short Reference Codes)
   ============================================================================ */
.ref-code {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  color: #B45309;
  background: #FEF3C7;
  padding: 0.08rem 0.35rem;
  border-radius: 3px;
  margin-right: 0.45rem;
  vertical-align: baseline;
  user-select: all;
}

body.edit-mode .ref-code {
  display: inline-block;
}

body.edit-mode [data-editable="true"] {
  outline: 1px dashed rgba(180, 83, 9, 0.45);
  outline-offset: 2px;
  border-radius: 2px;
  cursor: text;
}

body.edit-mode [data-editable="true"]:focus {
  outline: 1.5px solid #B45309;
  background: rgba(254, 243, 199, 0.25);
}

.edit-mode-banner {
  display: none;
  position: fixed;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  background: #18181B;
  color: #FAFAFA;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

body.edit-mode .edit-mode-banner {
  display: inline-flex;
}

.edit-mode-banner button {
  background: #FAFAFA;
  color: #18181B;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  cursor: pointer;
}

/* ============================================================================
   FOOTER
   ============================================================================ */
.minimal-footer {
  margin-top: 5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* ============================================================================
   RESPONSIVE
   ============================================================================ */
@media (max-width: 860px) {
  [data-design="split"] .page-shell {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  [data-design="split"] .site-intro {
    position: static;
    border-right: none;
    padding-right: 0;
  }
  [data-design="index"] .writing-main {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
  .writing-main {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
  .writing-meta {
    text-align: left;
  }
  .people-list {
    grid-template-columns: 1fr;
  }
  .minimal-switcher {
    position: static;
    margin: 1rem 2rem 0;
  }
  .page-shell {
    padding-top: 2rem;
  }
}