/* =============================================
   LAB NOTEBOOK THEME
   Swap --font-hand for your own handwriting font later.
   ============================================= */
:root {
  --paper: #fbf9f3;
  --ink: #23262c;
  --muted: #555a62;
  --pencil: #4b4f56;
  --blue-ink: #1f3fae;
  --red-pen: #c4352d;
  --rule: rgba(84, 132, 204, 0.14);
  --margin-red: rgba(214, 64, 64, 0.42);

  --font-text: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-hand: "Shadows Into Light Two", "Bradley Hand", cursive;

  --line: 28px;            /* ruled-line spacing; body line-height matches */
  --sheet: 1040px;         /* width of the "page" */
  --margin-w: 184px;       /* space left of the content column */
  --margin-x: max(22px, calc(50% - var(--sheet) / 2 + var(--margin-w) - 24px));
  --header-h: 56px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  position: relative;
  min-height: 100vh;
  font-family: var(--font-text);
  font-size: 17px;
  line-height: var(--line);
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(to right,
      transparent var(--margin-x),
      var(--margin-red) var(--margin-x),
      var(--margin-red) calc(var(--margin-x) + 1.5px),
      transparent calc(var(--margin-x) + 1.5px)),
    repeating-linear-gradient(to bottom,
      transparent 0,
      transparent calc(var(--line) - 1px),
      var(--rule) calc(var(--line) - 1px),
      var(--rule) var(--line));
  background-position: 0 0, 0 calc(var(--header-h) + 8px);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue-ink); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 2px solid var(--blue-ink); outline-offset: 3px; border-radius: 2px; }
img { max-width: 100%; display: block; }

.skip {
  position: absolute; left: -9999px; top: 8px; z-index: 100;
  background: var(--paper); padding: 6px 12px; border: 1px solid var(--ink);
}
.skip:focus { left: 12px; }

/* ---------- HEADER (always visible: resume + email) ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  height: var(--header-h);
  background-color: var(--paper);
  background-image: linear-gradient(to right,
    transparent var(--margin-x),
    var(--margin-red) var(--margin-x),
    var(--margin-red) calc(var(--margin-x) + 1.5px),
    transparent calc(var(--margin-x) + 1.5px));
  border-bottom: 1px solid var(--rule);
}
.header-inner {
  max-width: var(--sheet); height: 100%; margin: 0 auto;
  padding: 0 32px 0 var(--margin-w);
  display: flex; align-items: center; gap: 28px;
}
.header-name { font-weight: 600; color: var(--ink); text-decoration: none; margin-right: auto; }
.header-nav { display: flex; gap: 22px; list-style: none; }
.header-nav a { color: var(--muted); text-decoration: none; }
.header-nav a:hover { color: var(--ink); text-decoration: underline; }
.header-actions { display: flex; gap: 18px; align-items: center; }
.header-actions a { font-weight: 600; }

/* ---------- SHEET / ENTRIES ---------- */
main.sheet {
  max-width: var(--sheet); margin: 0 auto;
  padding: 0 32px 0 var(--margin-w);
}
.column { max-width: 680px; position: relative; }

.entry { position: relative; padding: calc(var(--line) * 2) 0 calc(var(--line) * 2); }

.entry-head {
  font-size: 1.55rem; line-height: calc(var(--line) * 1.5); font-weight: 600;
  letter-spacing: -0.01em; margin-bottom: var(--line);
}
.entry-head time { font-weight: 400; color: var(--muted); }

/* where the robot writes this section's word (filled in by robot.js) */
.robot-slot { height: calc(var(--line) * 5); position: relative; }

/* handwritten notes in the left margin */
.margin-note {
  position: absolute;
  left: calc(-1 * var(--margin-w) + 20px);
  width: calc(var(--margin-w) - 60px);
  font-family: var(--font-hand);
  font-size: 1.15rem; line-height: 1.3;
  color: var(--pencil);
  transform: rotate(-3deg);
}

p + p { margin-top: var(--line); }

/* ---------- HERO ---------- */
.hero { padding: calc(var(--line) * 3) 0 var(--line); }
/* lets a block run past the 680px reading column, up to the sheet edge */
.hero, .wide { width: calc(100vw - var(--margin-w) - 32px); max-width: calc(var(--sheet) - var(--margin-w) - 32px); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; align-items: center; }
.hero-role { font-style: italic; color: var(--muted); }
.hero-name {
  font-size: clamp(2.4rem, 5vw, 3.6rem); line-height: 1.05; font-weight: 600;
  letter-spacing: -0.02em; margin: 6px 0 var(--line);
}
.hero-desc { max-width: 34em; }
.hero-links { margin-top: var(--line); display: flex; gap: 24px; flex-wrap: wrap; font-weight: 600; }
.hero .robot-slot { height: 220px; }

/* ---------- TAPED PHOTOS ---------- */
.taped {
  position: relative;
  background: #fff;
  padding: 8px 8px 10px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12), 0 4px 10px rgba(0, 0, 0, 0.05);
  transform: rotate(var(--tilt, -1.5deg));
}
.taped::before {
  content: ""; position: absolute; top: -12px; left: 50%;
  width: 84px; height: 24px; margin-left: -42px;
  background: rgba(236, 226, 196, 0.72);
  border-left: 1px dashed rgba(0, 0, 0, 0.06); border-right: 1px dashed rgba(0, 0, 0, 0.06);
  transform: rotate(-4deg);
}
.taped figcaption {
  font-family: var(--font-hand); font-size: 1.1rem; line-height: 1.2;
  color: var(--pencil); margin-top: 6px; text-align: center;
}

/* ---------- ABOUT ---------- */
.about-grid { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 36px; align-items: start; }
.about-grid .taped { margin-top: 8px; }
.skills { margin-top: calc(var(--line) * 1.5); }
.skills h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 6px; }
.skills dl { display: grid; grid-template-columns: max-content minmax(0, 1fr); column-gap: 16px; }
.skills dt { color: var(--muted); font-style: italic; }
@media (min-width: 1000px) { .skills dd { white-space: nowrap; } }

/* ---------- PROJECTS ---------- */
.project { position: relative; padding: var(--line) 0; }
.project + .project { border-top: 1px solid rgba(35, 38, 44, 0.12); }
.project h3 { font-size: 1.25rem; line-height: 1.35; font-weight: 600; }
.project h3 a { color: var(--ink); text-decoration: none; }
/* whole entry is clickable */
.project h3 a::after { content: ""; position: absolute; inset: 0; z-index: 1; }
.project:hover h3 a, .project h3 a:focus-visible { color: var(--blue-ink); text-decoration: underline; }
.project h3 a:focus-visible { outline: none; }
.project:has(h3 a:focus-visible) { outline: 2px solid var(--blue-ink); outline-offset: 6px; border-radius: 2px; }
.project-meta { color: var(--muted); font-size: 0.95rem; }
.project-meta .year { color: var(--ink); font-weight: 600; }
.project-summary { margin-top: 4px; }
.more { display: inline-block; margin-top: 8px; color: var(--blue-ink); font-weight: 600; }

.project.featured { padding-bottom: calc(var(--line) * 1.5); }
.featured-label { font-family: var(--font-hand); font-size: 1.2rem; color: var(--blue-ink); }
.project.featured h3 { font-size: 1.5rem; }
.featured .taped { --tilt: 1.2deg; margin: calc(var(--line) * 1.25) 0 var(--line); max-width: 520px; }
.log { margin-top: var(--line); }
.log h4 { font-size: 1rem; font-weight: 600; font-style: italic; }
.log h4 + * { margin-top: 2px; }
.log section + section { margin-top: var(--line); }
.log ul { padding-left: 1.2em; }
.log li + li { margin-top: 4px; }

/* ---------- CONTACT ---------- */
.contact-email { font-size: clamp(1.25rem, 3.4vw, 1.7rem); font-weight: 600; word-break: break-word; }
.contact-list { list-style: none; margin-top: var(--line); }
.contact-list li { display: flex; gap: 12px; }
.contact-list span { color: var(--muted); min-width: 6.5em; font-style: italic; }

/* ---------- FOOTER ---------- */
.site-footer {
  max-width: var(--sheet); margin: 0 auto;
  padding: var(--line) 32px calc(var(--line) * 2) var(--margin-w);
  color: var(--muted); font-size: 0.95rem;
  display: flex; gap: 24px; flex-wrap: wrap;
}
.site-footer p { margin-right: auto; }

/* ---------- ROBOT LAYER (robot.js) ---------- */
.robot-layer {
  position: absolute; left: 0; top: 0; width: 100%; height: 100%;
  overflow: hidden; pointer-events: none; z-index: 5;
}
.robot-layer .trail {
  fill: none; stroke: #3b3d42; stroke-width: 2.6; stroke-opacity: 0.85;
  stroke-linecap: round; stroke-linejoin: round;
}
.robot-layer .red .trail { stroke: var(--red-pen); stroke-width: 2.2; stroke-opacity: 0.9; }

/* ---------- WRITE-UP PAGES (project.html, realtime-segmentation.html) ---------- */
.header-back { color: var(--muted); text-decoration: none; margin-right: auto; }
.header-inner:has(.header-back) .header-name { margin-right: 0; }
.header-inner a { white-space: nowrap; }
.header-back:hover { color: var(--ink); text-decoration: underline; }

.doc { padding: calc(var(--line) * 3) 0 calc(var(--line) * 3); }
.doc-head { margin-bottom: calc(var(--line) * 1.5); }
.entry-line { color: var(--muted); }
.doc-head h1 {
  font-size: clamp(1.9rem, 4.4vw, 2.8rem); line-height: 1.12; font-weight: 600;
  letter-spacing: -0.02em; margin: 6px 0 var(--line);
}
.doc-sub { font-style: italic; color: var(--muted); }
.doc-meta { margin-top: 6px; color: var(--muted); font-size: 0.95rem; }
.doc-links { margin-top: var(--line); display: flex; flex-wrap: wrap; gap: 8px 24px; font-weight: 600; }

.doc h2 {
  font-size: 1.4rem; line-height: 1.3; font-weight: 600; letter-spacing: -0.01em;
  margin-bottom: 12px;
}
.doc h3 { font-size: 1.1rem; font-weight: 600; margin: calc(var(--line) * 1.25) 0 6px; }
.case-sec { padding: calc(var(--line) * 1.5) 0; }
.case-sec + .case-sec { border-top: 1px solid rgba(35, 38, 44, 0.1); }
.body-text + .body-text, .result-note + .result-note { margin-top: 14px; }
.result-note { margin-top: 14px; }
.muted, .body-text.muted { color: var(--muted); }
.credits { color: var(--muted); font-size: 0.95rem; }

.plain-list { padding-left: 1.2em; margin: 14px 0; }
.plain-list li + li, .step-list > li + li { margin-top: 8px; }
.step-list { padding-left: 1.6em; margin: 14px 0; }
.step-list > li { padding-left: 4px; }
.step-list > li::marker { color: var(--muted); font-weight: 600; }

/* pull quote: typed, set off with a pencil line */
.emphasis-line {
  font-size: 1.15rem; font-style: italic; line-height: 1.55;
  border-left: 2px solid var(--pencil); padding: 2px 0 2px 16px; margin: var(--line) 0;
}

.table-wrap { overflow-x: auto; margin: 14px 0; }
.data-table { border-collapse: collapse; width: 100%; font-size: 0.95rem; background: rgba(251, 249, 243, 0.85); }
.data-table th, .data-table td { text-align: left; padding: 6px 12px; border-bottom: 1px solid rgba(35, 38, 44, 0.18); vertical-align: top; }
.data-table th { font-weight: 600; border-bottom: 1.5px solid var(--ink); }
.data-table td:not(:first-child) { font-variant-numeric: tabular-nums; }

.doc-media { margin: calc(var(--line) * 1.5) 0; display: grid; gap: calc(var(--line) * 1.5); }
.doc-media .taped { --tilt: 0.6deg; max-width: 640px; }
.video { aspect-ratio: 16 / 9; width: 100%; }
.video iframe { width: 100%; height: 100%; border: 0; display: block; }

.not-found { padding: calc(var(--line) * 4) 0; }

/* ---------- MOBILE ---------- */
@media (max-width: 860px) {
  :root { --margin-w: 44px; --margin-x: 22px; }
  .header-inner, main.sheet, .site-footer { padding-right: 20px; }
  .header-nav { display: none; }
  .hero, .wide { width: auto; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero .robot-slot { height: 160px; }
  .robot-slot { height: calc(var(--line) * 4); }
  .margin-note { position: static; width: auto; display: inline-block; margin-bottom: 6px; transform: rotate(-2deg); }
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
  .about-grid .taped { max-width: 220px; }
}
@media (max-width: 480px) {
  body { font-size: 16px; }
  .header-inner { gap: 14px; }
  .header-name { font-size: 0.95rem; }
  .header-actions { gap: 14px; font-size: 0.95rem; }
  /* subpages: the back link already goes home, so drop the name to fit */
  .header-inner:has(.header-back) .header-name { display: none; }
  .entry-head { font-size: 1.3rem; }
  .skills dl { grid-template-columns: 1fr; }
  .skills dd { margin-bottom: 6px; }
}