:root {
  --bg: #f8f6f0;
  --border: #e3ded2;
  --text: #211f1a;
  --text-muted: #8c8675;
  --text-faint: #aca896;
  --sage: #d9e3d1;
  --sage-icon: #3a4632;
  --accent-green: #517a4c;
  --card-bg: #fcfbf6;
  --placeholder-bg: #ece7da;
  --badge-neutral-bg: #e9e5d9;
  --sage-light: #e7efe1;
  --sage-track: #d6e0cc;
  --cover-bg: #f4f0e3;

  --font-serif: "Newsreader", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
}

body {
  font-family: var(--font-mono);
}

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

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

.layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */

.sidebar {
  width: 300px;
  flex-shrink: 0;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 56px 40px;
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.sidebar-top {
  margin-bottom: 32px;
}

.avatar {
  display: block;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 0 20px 0;
}

.roles {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}

.roles p {
  margin: 0;
}

.sidebar .divider {
  margin: 28px 0;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 22px;
  flex: 1;
}

.nav-item {
  position: relative;
  font-size: 15px;
  color: var(--text-muted);
  padding-left: 18px;
  transition: color 0.15s ease;
}

.nav-item:hover {
  color: var(--text);
}

.nav-item .dot {
  display: none;
}

.nav-item.is-active {
  color: var(--text);
  font-weight: 500;
}

.nav-item.is-active .dot {
  display: inline-block;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text);
}

.sidebar-bottom .divider {
  margin-bottom: 24px;
}

.social-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 20px;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: color 0.15s ease;
}

.social-links a:hover {
  color: var(--text);
}

.social-links svg {
  width: 18px;
  height: 18px;
}

/* Content */

.content {
  flex: 1;
  margin-left: 300px;
  padding: 88px 64px;
}

.content-inner {
  max-width: 480px;
}

.bio-section {
  max-width: 920px;
  margin-bottom: 48px;
}

.bio-columns {
  column-count: 2;
  column-gap: 48px;
}

.bio-columns p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0 0 18px 0;
}

.headline,
.article-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 34px;
  line-height: 1.2;
  margin: 0 0 16px 0;
  color: var(--text);
}

.intro {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0 0 18px 0;
}

.content .divider {
  margin: 32px 0;
}

.label {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 8px 0;
}

.current-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.current-list li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.current-list li:last-child {
  border-bottom: none;
}

.icon-circle {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--sage);
  color: var(--sage-icon);
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-circle svg {
  width: 18px;
  height: 18px;
}

.current-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.current-title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}

.current-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

.arrow {
  margin-left: auto;
  flex-shrink: 0;
  color: var(--text-faint);
  display: flex;
  transition: transform 0.15s ease, color 0.15s ease;
}

.arrow svg {
  width: 18px;
  height: 18px;
}

.current-list li:hover .arrow {
  color: var(--text);
  transform: translateX(3px);
}

.updated {
  font-size: 12px;
  color: var(--text-faint);
  margin: 48px 0 0 0;
}

/* Responsive */

@media (max-width: 860px) {
  .content {
    padding: 64px 40px;
  }

  .bio-columns {
    column-count: 1;
  }
}

@media (max-width: 768px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 40px 28px;
  }

  .nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 16px 24px;
  }

  .sidebar-bottom {
    margin-top: 32px;
  }

  .content {
    margin-left: 0;
    padding: 48px 28px;
  }
}

@media (max-width: 480px) {
  .content-inner {
    max-width: 100%;
  }

  .current-list li {
    align-items: flex-start;
  }
}

/* Article page (Researching, etc.) */

.layout-article {
  display: flex;
  min-height: 100vh;
}

.article-row {
  flex: 1;
  margin-left: 300px;
  display: flex;
  align-items: flex-start;
}

.article {
  flex: 1;
  max-width: 920px;
  padding: 64px 64px;
}

.article-subtitle {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 0 20px 0;
}

.meta {
  font-size: 12px;
  line-height: 1.9;
}

.meta p {
  margin: 0;
}

.meta-label {
  color: var(--text-muted);
}

.status-active {
  color: var(--accent-green);
}

.article .divider {
  margin: 32px 0;
}

.section-heading {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 19px;
  margin: 0 0 14px 0;
  color: var(--text);
}

.section-body {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0;
  max-width: 720px;
}

.section-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.section-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 720px;
}

.section-list li::before {
  content: "\2022";
  position: absolute;
  left: 0;
  color: var(--text-faint);
}

.section-list--refs li {
  font-size: 12px;
}

@media (max-width: 768px) {
  .layout-article {
    flex-direction: column;
  }

  .article-row {
    margin-left: 0;
    flex-direction: column;
  }

  .article {
    padding: 48px 28px;
    max-width: 100%;
  }
}

/* Building page */

.building-page {
  max-width: 1120px;
}

.building-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.card:hover {
  border-color: var(--text-faint);
}

.card-image {
  height: 180px;
  background: var(--placeholder-bg);
  flex-shrink: 0;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  padding: 20px 22px 22px;
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.card-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.3;
  margin: 0;
  color: var(--text);
}

.badge {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 20px;
  white-space: nowrap;
}

.badge--active {
  background: var(--sage);
  color: var(--accent-green);
}

.badge--neutral {
  background: var(--badge-neutral-bg);
  color: var(--text-muted);
}

.card-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0;
  flex: 1;
}

.card-tags {
  font-size: 12px;
  color: var(--text-faint);
  margin: 0;
}

.card-arrow {
  display: flex;
  justify-content: flex-end;
  color: var(--text-faint);
  transition: transform 0.15s ease, color 0.15s ease;
}

.card-arrow svg {
  width: 18px;
  height: 18px;
}

.card:hover .card-arrow {
  color: var(--text);
  transform: translateX(3px);
}

@media (max-width: 1100px) {
  .building-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .building-grid {
    grid-template-columns: 1fr;
  }
}

/* Reading page */

.reading-section + .reading-section {
  margin-top: 40px;
}

.section-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-row .section-heading {
  margin-bottom: 0;
}

.view-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--accent-green);
  transition: opacity 0.15s ease;
}

.view-link svg {
  width: 14px;
  height: 14px;
}

.view-link:hover {
  opacity: 0.7;
}

.book-cover {
  flex-shrink: 0;
  border-radius: 6px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.book-cover-title {
  font-family: var(--font-serif);
  line-height: 1.25;
}

.book-cover-author {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
}

.current-book-card {
  display: flex;
  align-items: flex-start;
  gap: 32px;
  background: var(--sage-light);
  border-radius: 16px;
  padding: 32px;
}

.current-book-card .book-cover {
  width: 140px;
  height: 190px;
  background: var(--cover-bg);
  padding: 18px;
}

.current-book-card .book-cover-title {
  font-style: italic;
  font-size: 17px;
  color: var(--text);
}

.current-book-card .book-cover-author {
  color: var(--text-muted);
}

.current-book-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.current-book-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 19px;
  margin: 0;
  color: var(--text);
}

.current-book-author {
  font-size: 12px;
  color: var(--text-muted);
  margin: 0;
}

.badge--reading {
  align-self: flex-start;
  background: #cfe0c2;
  color: var(--accent-green);
}

.progress-row {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 14px;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--sage-track);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 6px;
}

.progress-fill {
  height: 100%;
  background: var(--accent-green);
  border-radius: 4px;
}

.current-book-why {
  width: 220px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.current-book-why h5 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}

.current-book-why p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0;
}

.finished-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.finished-card {
  display: flex;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-bg);
  transition: border-color 0.15s ease;
}

.finished-card:hover {
  border-color: var(--text-faint);
}

.finished-card .book-cover {
  width: 64px;
  height: 88px;
  padding: 8px;
  align-items: center;
  text-align: center;
  justify-content: center;
}

.finished-card .book-cover-title {
  font-size: 11px;
  font-weight: 600;
}

.book-cover--charlie {
  background: #3c3a2c;
}

.book-cover--charlie .book-cover-title {
  color: #f0ede0;
}

.book-cover--deepwork {
  background: #eee9da;
}

.book-cover--deepwork .book-cover-title {
  color: #1c1c1c;
}

.book-cover--atomic {
  background: #fdfcf8;
}

.book-cover--atomic .book-cover-title {
  color: #c0392b;
}

.finished-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.finished-info h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.3;
  margin: 0;
  color: var(--text);
}

.finished-author {
  font-size: 12px;
  color: var(--text-muted);
  margin: 0;
}

.finished-date {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--text-faint);
  margin: 4px 0 0 0;
}

.finished-date svg {
  width: 12px;
  height: 12px;
}

.tbr-table-wrap {
  overflow-x: auto;
}

.tbr-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  white-space: nowrap;
}

.tbr-table th {
  text-align: left;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--text-faint);
  padding: 0 0 12px 0;
  border-bottom: 1px solid var(--border);
}

.tbr-table td {
  padding: 14px 16px 14px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  vertical-align: top;
  white-space: normal;
}

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

.tbr-table td:first-child {
  color: var(--text);
  font-weight: 500;
  white-space: nowrap;
}

.tbr-title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.bookmark-icon {
  flex-shrink: 0;
  width: 13px;
  height: 13px;
  color: var(--text-faint);
}

@media (max-width: 900px) {
  .finished-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .current-book-card {
    flex-direction: column;
  }

  .current-book-why {
    width: 100%;
  }
}

/* Learning page */

.learning-tabs {
  display: flex;
  gap: 28px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

.tab-item {
  font-size: 13px;
  color: var(--text-muted);
  padding-bottom: 12px;
  position: relative;
  transition: color 0.15s ease;
}

.tab-item:hover {
  color: var(--text);
}

.tab-item.is-active {
  color: var(--text);
  font-weight: 600;
}

.tab-item.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--text);
}

.learning-grid {
  grid-template-columns: repeat(3, 1fr);
}

.learning-illustration {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--text-muted);
}

.diagram-icon {
  width: 70px;
  height: 50px;
}

.diagram-icon--wide {
  width: 160px;
  height: 90px;
}

.diagram-box {
  flex-shrink: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  padding: 8px 12px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text);
  text-align: center;
  line-height: 1.3;
  white-space: nowrap;
}

.diagram-box--tall {
  padding: 14px 12px;
}

.diagram-arrow {
  color: var(--text-faint);
  font-size: 16px;
}

.token-grid {
  display: grid;
  grid-template-columns: repeat(3, 12px);
  grid-template-rows: repeat(3, 12px);
  gap: 3px;
}

.token-grid span {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 2px;
}

.token-stack {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.token-stack span {
  width: 12px;
  height: 12px;
  background: var(--sage);
  border-radius: 2px;
}

.doc-stack {
  position: relative;
  width: 46px;
  height: 50px;
  margin-right: 4px;
}

.doc-card {
  position: absolute;
  width: 38px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--card-bg);
}

.doc-card:nth-child(1) {
  top: 0;
  left: 0;
}

.doc-card:nth-child(2) {
  top: 4px;
  left: 4px;
}

.doc-card:nth-child(3) {
  top: 8px;
  left: 8px;
  background: var(--sage);
}

.doc-label {
  position: absolute;
  bottom: -16px;
  left: 0;
  width: 56px;
  font-size: 8px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.learning-illustration--chart {
  position: relative;
}

.chart-legend {
  position: absolute;
  top: 14px;
  right: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 9px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.chart-legend span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legend-line {
  width: 14px;
  height: 0;
  border-top: 1.4px solid var(--text);
}

.legend-line--dashed {
  border-top-style: dashed;
}

.card-category {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-green);
  margin: 0;
}


.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
}

.card-meta {
  font-size: 12px;
  color: var(--text-faint);
}

.learning-empty {
  display: none;
  text-align: center;
  font-size: 13px;
  color: var(--text-faint);
  margin: 40px 0 0 0;
}

.learning-empty.is-visible {
  display: block;
}

@media (max-width: 1100px) {
  .learning-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .learning-grid {
    grid-template-columns: 1fr;
  }

  .learning-tabs {
    flex-wrap: wrap;
    gap: 16px 20px;
  }
}

/* Writing page */

.writing-year-group {
  margin-top: 36px;
}

.writing-year-group:first-of-type {
  margin-top: 32px;
}

.writing-year {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 8px 0;
}

.writing-row {
  display: grid;
  grid-template-columns: 90px 1fr 300px 90px;
  gap: 24px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.writing-date {
  font-size: 12px;
  color: var(--text-muted);
  padding-top: 4px;
}

.writing-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.3;
  color: var(--text);
  margin: 0;
  transition: color 0.15s ease;
}

.writing-row:hover .writing-title {
  color: var(--accent-green);
}

.writing-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0;
  padding-top: 4px;
}

.writing-time {
  font-size: 12px;
  color: var(--text-faint);
  text-align: right;
  padding-top: 4px;
  white-space: nowrap;
}

@media (max-width: 900px) {
  .writing-row {
    grid-template-columns: 70px 1fr;
  }

  .writing-desc {
    grid-column: 2 / 3;
    margin-top: -4px;
  }

  .writing-time {
    grid-column: 2 / 3;
    text-align: left;
    margin-top: -4px;
  }
}

@media (max-width: 600px) {
  .writing-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .writing-desc,
  .writing-time {
    grid-column: 1;
    text-align: left;
  }
}