/* General page styling */
body {
  margin: 0;
  padding: 30px 4%;
  background-color: #050505;
  color: #cecece;
  font-family: 'ubuntu', sans-serif;
}

/* Page heading */
header {
  text-align: center;
  margin-bottom: 35px;
  position: relative;
  left: 0px;
  top: 0px;
}

header h1 {
  font-family: 'ubuntu', sans-serif;
  font-size: 34px;
  margin: 0 0 0.05px;
}

header p {
  font-family: 'ubuntu', sans-serif;
  font-size: 14px;
  color: #bbb;
  margin-top: 0;
}

/* Four-section horizontal layout */
main {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  column-gap: 25px;
  max-width: 1350px;
  margin: 12px auto 0;
  min-height: 260px;
}

/* Individual sections */
section h2 {
  font-size: 17px;
  font-weight: 500;
  border-bottom: 1px solid #252525;
  padding-bottom: 8px;
  margin: 0 0 12px;
}

section p {
  font-size: 14px;
  color: #b8b8b8;
  margin: 0 0 7px;
  white-space: nowrap;
}

/* Smaller screens */
@media (max-width: 700px) {
  main {
    grid-template-columns: 1fr;
    row-gap: 40px;
  }

section h2 {
  font-size: 20px;
  font-weight: 500;
  border-bottom: 1px solid #252525;
  padding-bottom: 12px;
  margin: 0 0 18px;
}

section p {
  font-size: 16px;
  color: #b8b8b8;
  margin: 0 0 12px;
}
}

/* Colored navigation dots */
.dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin-right: 10px;
  vertical-align: middle;
}

.green {
  background-color: #4caf50;
}

.red {
  background-color: #e74c3c;
}

/* Parent navigation item */
.nav-parent {
  display: table;
  width: auto;
  cursor: pointer;
  transition: transform 0.8s ease;
  transform-origin: left center;
}

/* Enlarge slightly on hover */
.nav-parent:hover {
  transform: scale(1.05);
}

/* Hide sub-links initially */
.sub-links {
  display: block;
  margin-left: 40px;
  padding-top: 0;
  padding-bottom: 0;
  position: relative;

  max-height: 0;
  opacity: 0;
  visibility: hidden;
  overflow: hidden;

  
  
  transition: max-height 1s ease, opacity 0.2s ease, visibility 1.8s;



}

.sub-links::before {
  content: "";
  position: absolute;
  left: -40px;
  right: 0;
  height: 25px;
  top: -20px;
}

/* Reveal sub-links on hover */
.nav-group:hover .sub-links,
.nav-group:focus-within .sub-links,
.nav-group.closing-delay .sub-links {
  max-height: 150px;
  opacity: 1;
  visibility: visible;
  padding-top: 2px;
  padding-bottom: 15px;
}

/* Sub-link text, spacing, and animation */
.sub-links p {
  display: table;
  width: auto;
  font-size: 12px;
  margin: 0 0 4px;
  padding-right: 30px;
  opacity: 0;
  transform-origin: left center;
  transition:
    opacity 0.8s ease,
    transform 0.6s ease;
}

/* Hollow green dot */
.hollow-green {
  background-color: transparent;
  border: 1px solid #4caf50;
  box-sizing: border-box;
}

/* Sub-link appearance */
.sub-links a {
  color: #b8b8b8;
  text-decoration: none;
}

.sub-links p:hover {
  transform: scale(1.05);
}

.nav-group {
  width: fit-content;
}

/* Smooth submenu closing without changing its opening animation */
.nav-group:not(:hover):not(:focus-within):not(.closing-delay) .sub-links {
  transition:
    max-height 0.8s ease,
    opacity 0.8s ease,
    visibility 0s linear 0.8s;
}

/* Sequential appearance of sub-links */
.nav-group:hover .sub-links p,
.nav-group:focus-within .sub-links p,
.nav-group.closing-delay .sub-links p {
  opacity: 1;
}

.nav-group:hover .sub-links p:nth-child(2),
.nav-group:focus-within .sub-links p:nth-child(2) {
  transition-delay: 0.3s, 0s;
}

.hollow-red {
  background-color: transparent;
  border: 1px solid #e74c3c;
  box-sizing: border-box;
}

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

.dissertation-link {
  display: table;
  width: auto;
  cursor: pointer;
  transition: transform 0.8s ease;
  transform-origin: left center;
}

.dissertation-link:hover {
  transform: scale(1.05);
}


/* Top navigation bar */
.top-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  column-gap: 25px;
  max-width: 1350px;
  margin: 35px auto 0;
}

.top-nav button {
  background: none;
  border: none;
  border-bottom: 1px solid #252525;
  color: #cecece;
  font-family: 'Ubuntu', sans-serif;
  font-size: 17px;
  font-weight: 500;
  text-align: left;
  padding: 0 0 8px;
  cursor: pointer;
}

.top-nav button:hover {
  color: #e6e6e6;
}


/* Hide inactive sections */
main > section[hidden] {
  display: none;
}

/* Selected navigation heading */
.top-nav button.active {
  color: #e6e6e6;
}


/* Content displayed beneath the navigation */
#content-area {
  max-width: 1350px;
  margin: 65px auto 0;
  padding-bottom: 60px;
}

#content-area h2 {
  font-size: 20px;
  font-weight: 500;
  margin: 0 0 30px;
  padding: 0 0 15px;
  border-bottom: 1px solid #252525;
}

#content-area p {
  font-size: 15px;
  line-height: 1.7;
  color: #b8b8b8;
}

/* Arrow indicating the selected navigation item */
.dot.selected {
  width: 7px;
  height: 7px;
  background: none;
  border: none;
  border-radius: 0;
  position: relative;
}

.dot.selected::after {
  content: "➜";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  color: #4caf50;
  font-size: 13px;
  line-height: 1;
}


/* Selectable navigation items */
.selectable-item {
  display: table;
  width: auto;
  cursor: pointer;
  transition: transform 0.3s ease;
  transform-origin: left center;
}

.selectable-item:hover {
  transform: scale(1.05);
}

/* Hide inactive content panels */
.content-panel[hidden] {
  display: none;
}


/* Preserve the original dot color when selected */
.dot.selected.red::after {
  color: #e74c3c;
}

.dot.selected.green::after {
  color: #4caf50;
}

/* Green arrow for selected hollow-green sublinks */
.dot.selected.hollow-green::after {
  color: #4caf50;
}

/* Keep a submenu visible when it contains the selected item */
.nav-group.has-selection .sub-links {
  max-height: 150px;
  opacity: 1;
  visibility: visible;
  padding-top: 2px;
  padding-bottom: 15px;
}

.nav-group.has-selection .sub-links p {
  opacity: 1;
}

/* Divider between Navigation Panel and Content Panel */
#content-area::before {
  content: "";
  display: block;
  width: 100%;
  height: 1px;
  background-color: #252525;
  margin-bottom: 15px;
}


/* Navigation column order and alignment */
#personal {
  grid-column: 1;
  grid-row: 1;
}

#philosophy {
  grid-column: 2;
  grid-row: 1;
}

#data-science {
  grid-column: 3;
  grid-row: 1;
}

#ai {
  grid-column: 4;
  grid-row: 1;
}

/* Red arrow for selected hollow-red sublinks */
.dot.selected.hollow-red::after {
  color: #e74c3c;
}

/* External links inside the Content Panel */
#content-area a {
  color: #aaa;
  text-decoration: none;
  transition: color 0.3s ease;
}

#content-area a:hover {
  color: #e6e6e6;
  text-decoration: underline;
}

/* Email copy icon */
#copy-email {
  background: transparent;
  border: none;
  color: #cecece;
  padding: 4px;
  margin-left: 8px;
  cursor: pointer;
  vertical-align: middle;
}

#copy-email:hover {
  color: #e6e6e6;
}


/* Dissertation title */
#dissertation-content h3 {
  font-size: 18px;
  font-weight: 500;
  color: #cecece;
  margin: 0 0 8px;
}

/* Abstract heading */
#dissertation-content h4 {
  font-size: 15px;
  font-weight: 500;
  color: #aaa;
  margin: 30px 0 12px;
}

/* Improve readability of the dissertation abstract */
#dissertation-content > p {
  max-width: 850px;
}



/* Project Reader — blue technical-editorial prototype */
.project-reader { --reader-blue:#87b4e5; --reader-blue-soft:#a7c9ed; --reader-line:#30465b; --reader-muted:#aab9c9; color:#d0d6dc; }
.project-reader .reader-masthead { padding:18px 0 24px; border-bottom:1px solid var(--reader-line); }
.project-reader .reader-eyebrow, .project-reader .reader-kicker, .project-reader .reader-investigation-label, .project-reader .reader-sidebar-heading, .project-reader .reader-sidebar-foot {font-size:11px;letter-spacing:.12em;color:var(--reader-blue);font-weight:500;}
.project-reader .reader-eyebrow span {color:#60758b;margin:0 7px;}
#content-area .project-reader .reader-masthead h2 {font-size:29px;line-height:1.2;border:0;padding:0;margin:13px 0 8px;font-weight:500;}
#content-area .project-reader .reader-deck {margin:0;color:var(--reader-muted);font-size:13px;}
.project-reader .reader-layout {display:grid;grid-template-columns:235px minmax(0,1fr);gap:42px;padding-top:32px;}
.project-reader .reader-sidebar {border-right:1px solid var(--reader-line);padding-right:22px;align-self:start;position:sticky;top:20px;}
.project-reader .reader-sidebar-heading {margin:0 0 20px;}
.project-reader .reader-nav {display:grid;gap:5px;}
.project-reader .reader-nav-item {display:grid;grid-template-columns:27px minmax(0,1fr);gap:9px;text-align:left;background:none;border:0;border-left:2px solid transparent;padding:10px 4px 10px 11px;color:#a7b5c4;font:400 13px/1.45 Ubuntu,sans-serif;cursor:pointer;}
.project-reader .reader-nav-item span:first-child {font-size:11px;color:#6985a2;}
.project-reader .reader-nav-item:hover {color:#e5f0ff;}
.project-reader .reader-nav-item[aria-current="page"] {border-left-color:var(--reader-blue);color:#cad7e6;background:linear-gradient(90deg,rgba(77,127,180,.13),transparent);}
.project-reader .reader-nav-item[aria-current="page"] span:first-child {color:var(--reader-blue);}
.project-reader .reader-sidebar-foot {margin-top:35px;color:#71869a;font-size:10px;}
.project-reader .reader-sidebar-foot span {padding:0 5px;}
.project-reader .reader-main {min-width:0;max-width:850px;padding-bottom:80px;}
.project-reader .reader-section[hidden] {display:none;}
.project-reader .reader-kicker {margin-bottom:13px;}
.project-reader .reader-main h3 {font-size:25px;line-height:1.3;font-weight:500;margin:0 0 24px;}
.project-reader .reader-main h4 {font-size:17px;font-weight:500;margin:34px 0 14px;color:#cdd5df;}
.project-reader .reader-main h5 {font-size:13px;font-weight:500;letter-spacing:.02em;margin:31px 0 13px;color:var(--reader-blue-soft);}
#content-area .project-reader .reader-main p {font-size:14px;line-height:1.85;color:#adb8c3;margin:0 0 18px;}
.project-reader .reader-note {border-left:2px solid var(--reader-blue);background:#111c28;padding:16px 20px;margin:28px 0;}
.project-reader .reader-note>span {font-size:10px;letter-spacing:.12em;color:var(--reader-blue);}
#content-area .project-reader .reader-note p {margin:7px 0 0;font-size:13px;}
.project-reader .reader-investigation {margin-top:35px;border-top:1px solid var(--reader-line);padding-top:24px;}
.project-reader .reader-investigation-label span {color:#617b94;margin:0 6px;}
.project-reader .reader-code {border:1px solid #273e54;background:#101e2c;overflow:hidden;}
.project-reader .reader-code-top {display:flex;justify-content:space-between;align-items:center;padding:9px 15px;border-bottom:1px solid #273e54;font-size:10px;letter-spacing:.12em;color:var(--reader-blue);}
.project-reader .reader-copy {background:none;border:0;color:#c0d9f3;cursor:pointer;font:inherit;letter-spacing:0;}
.project-reader .reader-copy:hover {color:white;}
.project-reader .reader-code pre {margin:0;padding:18px;overflow-x:auto;color:#d7e5f6;font:12px/1.7 Menlo,Consolas,monospace;tab-size:2;}
.project-reader .reader-table-scroll {overflow-x:auto;border-top:1px solid var(--reader-line);}
.project-reader .reader-table {width:100%;border-collapse:collapse;font-size:13px;}
.project-reader .reader-table th {text-align:left;color:#9ec5ef;font-size:11px;letter-spacing:.04em;font-weight:500;border-bottom:1px solid var(--reader-line);padding:11px 12px;white-space:nowrap;}
.project-reader .reader-table td {padding:10px 12px;border-bottom:1px solid #1e2c3a;color:#d0d9e3;}
.project-reader .reader-table td:not(:first-child) {font-variant-numeric:tabular-nums;}
#content-area .project-reader .reader-table-caption {font-size:11px;color:#8295a9;margin-top:9px;}
.project-reader .reader-insights {margin-top:30px;border-top:1px solid var(--reader-line);}
.project-reader .reader-insights details {border-bottom:1px solid var(--reader-line);}
.project-reader .reader-insights summary {cursor:pointer;list-style:none;padding:19px 8px;color:#b7d6f5;font-size:14px;display:flex;gap:14px;align-items:center;}
.project-reader .reader-insights summary::-webkit-details-marker {display:none;}
.project-reader .reader-insights summary span {color:#6f8fae;font-size:11px;}
.project-reader .reader-insights summary::after {content:'+';font-size:19px;margin-left:auto;color:var(--reader-blue);}
.project-reader .reader-insights details[open] summary::after {content:'−';}
.project-reader .reader-insight-body {padding:0 16px 16px 46px;}
#content-area .project-reader .reader-related {font-size:11px;color:#8299b0;border-top:1px solid #273b50;padding-top:13px;margin-top:20px;}
.project-reader .reader-related span {padding:0 4px;}
@media(max-width:850px){.project-reader .reader-layout {grid-template-columns:175px minmax(0,1fr);gap:22px;}.project-reader .reader-sidebar{padding-right:12px;}}
@media(max-width:570px){.project-reader .reader-layout {grid-template-columns:125px minmax(0,1fr);gap:12px;}.project-reader .reader-nav-item {grid-template-columns:19px minmax(0,1fr);gap:4px;padding:8px 2px 8px 5px;font-size:11px;}.project-reader .reader-sidebar{padding-right:7px;}.project-reader .reader-main h3{font-size:20px;}#content-area .project-reader .reader-masthead h2{font-size:23px;}.project-reader .reader-code pre{font-size:11px;padding:11px;}}

/* Balanced portfolio navigation colors */
.green { background-color:#68B58B; }
.red { background-color:#D17B80; }
.hollow-green { background:transparent;border-color:#68B58B; }
.hollow-red { background:transparent;border-color:#D17B80; }
.dot.selected.green::after,.dot.selected.hollow-green::after {color:#68B58B;}
.dot.selected.red::after,.dot.selected.hollow-red::after {color:#D17B80;}
#content-area .project-reader .reader-bullet {padding-left:19px;position:relative;margin-bottom:7px;}
#content-area .project-reader .reader-bullet::before {content:'–';position:absolute;left:2px;color:#87b4e5;}
.project-reader .reader-detail {border-top:1px solid var(--reader-line);border-bottom:1px solid var(--reader-line);margin-top:12px;}
.project-reader .reader-detail summary {cursor:pointer;list-style:none;padding:17px 8px;color:#b7d6f5;font-size:14px;display:flex;gap:14px;align-items:center;}
.project-reader .reader-detail summary::-webkit-details-marker {display:none;}
.project-reader .reader-detail summary span {color:#6f8fae;font-size:11px;}
.project-reader .reader-detail summary::after {content:'+';font-size:19px;margin-left:auto;color:var(--reader-blue);}
.project-reader .reader-detail[open] summary::after {content:'−';}
.project-reader .reader-detail .reader-insight-body {padding:0 16px 14px 46px;}
.project-reader .reader-investigation {margin-bottom:45px;}
.project-reader .reader-main .reader-table-scroll {margin:18px 0 12px;}
.project-reader .reader-table {min-width:460px;}
.project-reader .reader-table-scroll:has(th:nth-child(9)) .reader-table {min-width:1060px;}
.project-reader .reader-main p code {font-family:Menlo,Consolas,monospace;font-size:.9em;color:#b9d5f1;}

/* Reader refinements: readable prose, distinctive rules, unified green */
.project-reader {--reader-blue:#8dbda5;--reader-blue-soft:#b0d5be;--reader-line:#30483e;--reader-muted:#acbdb4;}
.project-reader .reader-nav-item[aria-current="page"] {background:linear-gradient(90deg,rgba(104,181,139,.11),transparent);}
.project-reader .reader-nav-item span:first-child {color:#789989;}
.project-reader .reader-main {max-width:820px;min-width:0;}
.project-reader .reader-main p, .project-reader .reader-main li {max-width:68ch;white-space:normal;overflow-wrap:break-word;}
.project-reader .reader-main h3,.project-reader .reader-main h4,.project-reader .reader-main h5 {max-width:68ch;overflow-wrap:break-word;}
.project-reader .reader-layout {grid-template-columns:235px minmax(0,1fr);}
.project-reader .reader-table-scroll,.project-reader .reader-code {max-width:100%;}
.project-reader .reader-investigation {border-top:2px solid #587d6a;padding-top:26px;margin-top:44px;}
.project-reader .reader-table-scroll {border-top:0;}
.project-reader .reader-table th {border-bottom:1px solid #567261;}
.project-reader .reader-table td {border-bottom:1px solid #26362e;}
.project-reader .reader-detail {border-top:1px solid #3a5145;border-bottom:1px solid #3a5145;}
#content-area .project-reader a.reader-internal-link {color:#a9d5bb;text-decoration:underline;text-decoration-color:#4a735d;text-underline-offset:3px;}
#content-area .project-reader a.reader-internal-link:hover {color:#e3f6e9;}
#content-area .project-reader .reader-main p code {color:#b0d5be;}
#content-area .project-reader .reader-bullet::before {color:#8dbda5;}
.project-reader .reader-code {background:#111e18;border-color:#2b4437;}
.project-reader .reader-code-top {border-color:#2b4437;}
.project-reader .reader-note {background:#131e18;}
@media(max-width:850px){.project-reader .reader-layout {grid-template-columns:175px minmax(0,1fr);}}
@media(max-width:570px){.project-reader .reader-layout {grid-template-columns:125px minmax(0,1fr);}}

/* Site-wide structural rule: project masthead uses the same neutral divider as other content headings. */
#content-area .project-reader .reader-masthead { border-bottom-color: #252525; }