/* ============================================================
   jontofant.github.io — hand-written CSS, no build step
   ============================================================ */

:root {
  --bg: #faf9f7;
  --bg-raised: #ffffff;
  --bg-panel: #ffffff;
  --bg-translucent: rgba(250, 249, 247, 0.85);
  --line: #d9d5cd;
  --line-soft: #e8e5df;
  --text: #1b1f24;
  --text-dim: #5d6672;
  /* The orange from the robot renders is a graphic colour: at 1.9:1 on white
     it is unreadable as text. --accent is the darkened, AA-compliant text
     version (4.6:1); --accent-bright stays for fills, dots and canvas marks. */
  --accent: #a85f00;
  --accent-bright: #f6a821;
  --accent-soft: rgba(246, 168, 33, 0.16);
  --green: #1a7f4b;
  --red: #c0392b;
  --blue: #1f6fb2;
  --shadow: 0 18px 50px rgba(27, 31, 36, 0.10);
  --shadow-soft: 0 2px 10px rgba(27, 31, 36, 0.06);
  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, Menlo, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --wrap: 46rem;
  --wrap-wide: 66rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  /* faint engineering-grid backdrop */
  background-image:
    linear-gradient(rgba(27, 31, 36, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 31, 36, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
}

.mono { font-family: var(--mono); }
.accent { color: var(--accent); }

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.25rem;
}
.wrap-wide { max-width: var(--wrap-wide); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

h1, h2, h3 { line-height: 1.15; margin: 0 0 0.75rem; letter-spacing: -0.01em; }

/* ============================== header ============================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-translucent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}

.nav {
  max-width: var(--wrap-wide);
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-name {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  letter-spacing: 0.02em;
}
.nav-name:hover { text-decoration: none; color: var(--accent); }

.nav-links {
  display: flex;
  gap: 1.4rem;
  list-style: none;
  margin: 0 0 0 auto;
  padding: 0;
}
.nav-links a {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-dim);
}
.nav-links a:hover { color: var(--accent); text-decoration: none; }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 9px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  margin: 3.5px 0;
  transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .nav { flex-wrap: wrap; }
  .nav-links {
    display: none;
    flex-direction: column;
    gap: 0.2rem;
    width: 100%;
    padding: 0.5rem 0 0.75rem;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { display: block; padding: 0.45rem 0.25rem; font-size: 1rem; }
}

/* ============================== hero ============================== */

.hero { padding: 4.5rem 0 3rem; }

.eyebrow {
  color: var(--text-dim);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  margin: 0 0 1rem;
}

.hero h1 {
  font-size: clamp(2.3rem, 6vw, 3.8rem);
  font-weight: 800;
  margin-bottom: 1.2rem;
}

.lede {
  font-size: 1.15rem;
  color: var(--text);
  max-width: 38rem;
}

.lede-hint {
  color: var(--text-dim);
  font-size: 0.88rem;
  max-width: 42rem;
  margin: 1.4rem 0 2.2rem;
}
.lede-hint strong { color: var(--accent); }

/* ============================== sim panels ============================== */

.sim-panel {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.sim-titlebar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.9rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-bottom: 1px solid var(--line-soft);
  background: var(--bg-raised);
  flex-wrap: wrap;
}

.sim-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent-bright);
  box-shadow: 0 0 8px var(--accent-bright);
  flex: none;
}
.sim-dot.dot-green { background: var(--green); box-shadow: 0 0 8px var(--green); }

.sim-sub { margin-left: auto; opacity: 0.75; font-size: 0.75rem; }
@media (max-width: 640px) { .sim-sub { display: none; } }

.sim-panel canvas {
  display: block;
  width: 100%;
  height: 420px;
  cursor: pointer;
  touch-action: manipulation;
}
#watering-canvas { height: 380px; cursor: default; }

@media (max-width: 640px) {
  .sim-panel canvas { height: 330px; }
  #watering-canvas { height: 320px; }
}

.sim-controls {
  border-top: 1px solid var(--line-soft);
  padding: 0.9rem 1rem 1rem;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 1rem 1.5rem;
  align-items: start;
}
@media (max-width: 820px) {
  .sim-controls { grid-template-columns: 1fr; }
}

.slider-grid { display: grid; gap: 0.35rem; }

.slider-row {
  display: grid;
  grid-template-columns: 11.5rem 1fr 3.4rem;
  align-items: center;
  gap: 0.7rem;
}
@media (max-width: 480px) {
  .slider-row { grid-template-columns: 8.5rem 1fr 3.2rem; }
}

.slider-name {
  font-size: 0.82rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.slider-name em {
  font-style: normal;
  color: var(--text-dim);
  font-size: 0.72rem;
}

.slider-row output {
  font-size: 0.82rem;
  color: var(--accent);
  text-align: right;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--line);
  outline-offset: 4px;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-panel);
  box-shadow: 0 0 0 1px var(--accent);
}
input[type="range"]::-moz-range-thumb {
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-panel);
  box-shadow: 0 0 0 1px var(--accent);
}

.sim-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.btn {
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 0.45rem 0.85rem;
  border-radius: 7px;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  cursor: pointer;
  transition: background 0.15s;
}
.btn:hover { background: rgba(246, 168, 33, 0.30); }
.btn:active { transform: translateY(1px); }

.btn-ghost {
  border-color: var(--line);
  background: transparent;
  color: var(--text-dim);
}
.btn-ghost:hover { background: var(--bg-raised); color: var(--text); }

.select-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
select {
  font-family: var(--mono);
  font-size: 0.82rem;
  background: var(--bg-raised);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.4rem 0.5rem;
  cursor: pointer;
}

.mode-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 7px;
  overflow: hidden;
}
.mode-btn {
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 0.45rem 0.7rem;
  border: none;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  white-space: nowrap;
}
.mode-btn.is-active {
  background: var(--accent-soft);
  color: var(--accent);
}

/* explain blocks */

.explain {
  border-top: 1px solid var(--line-soft);
  padding: 0 1rem;
}
.explain summary {
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  padding: 0.7rem 0;
  list-style: none;
}
.explain summary::-webkit-details-marker { display: none; }
.explain summary::before { content: "▸ "; color: var(--accent); }
.explain[open] summary::before { content: "▾ "; }
.explain summary:hover { color: var(--text); }
.explain > div {
  padding: 0 0.25rem 1rem;
  font-size: 0.95rem;
  color: var(--text-dim);
  max-width: 52rem;
}
.explain strong { color: var(--text); }
.explain pre {
  background: var(--bg-raised);
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  overflow-x: auto;
  font-size: 0.8rem;
  color: var(--text);
  line-height: 1.7;
}
.explain code { color: var(--accent); font-size: 0.88em; }

/* ============================== sections ============================== */

.section { padding: 4.5rem 0; border-top: 1px solid var(--line-soft); }

.section-num {
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.25em;
  margin: 0 0 0.4rem;
}
.section-num::after { content: " /"; color: var(--line); }

.section h2 { font-size: clamp(1.7rem, 4vw, 2.3rem); font-weight: 750; }

.section-lede { color: var(--text-dim); max-width: 44rem; margin-bottom: 2rem; }
.section-lede em { color: var(--text); }

/* cards */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr));
  gap: 1rem;
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.2rem 1.3rem;
}
.card h3 {
  font-size: 0.9rem;
  color: var(--accent);
  letter-spacing: 0.03em;
  margin-bottom: 0.6rem;
}
.card p { margin: 0; font-size: 0.95rem; color: var(--text-dim); }

/* media */

.media-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 0 0 2.2rem;
}
@media (max-width: 640px) { .media-grid { grid-template-columns: 1fr; } }

.media-grid figure { margin: 0; }
.media-grid img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg-raised);
}
.media-grid-arm img { object-fit: contain; background: var(--bg-raised); }
.media-grid figcaption {
  font-size: 0.75rem;
  color: var(--text-dim);
  padding-top: 0.45rem;
}
.media-grid figcaption::before { content: "› "; color: var(--accent); }

/* robot spec + story */

.spec-and-story {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  align-items: start;
}
@media (max-width: 760px) { .spec-and-story { grid-template-columns: 1fr; } }

.story h3 { font-size: 1.15rem; }
.story p { color: var(--text-dim); font-size: 0.98rem; }

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.spec-table th, .spec-table td {
  text-align: left;
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: none; }
.spec-table th {
  color: var(--accent);
  font-weight: 500;
  white-space: nowrap;
  width: 1%;
}
.spec-table td { color: var(--text); }

/* features (earlier work) */

.feature-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem 2rem;
}
@media (max-width: 640px) { .feature-list { grid-template-columns: 1fr; } }

.feature h3 { font-size: 0.88rem; color: var(--accent); margin-bottom: 0.35rem; }
.feature p { margin: 0; font-size: 0.95rem; color: var(--text-dim); }

/* publications */

.pub-list {
  list-style: none;
  counter-reset: pub;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.2rem;
}
.pub-list li {
  counter-increment: pub;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  border-radius: 10px;
  padding: 1.1rem 1.3rem 1.1rem 3.4rem;
  position: relative;
}
.pub-list li::before {
  content: "[" counter(pub) "]";
  position: absolute;
  left: 1.1rem;
  top: 1.15rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
}
.pub-title { margin: 0 0 0.35rem; font-weight: 600; }
.pub-en { display: block; font-weight: 400; color: var(--text-dim); font-size: 0.9rem; }
.pub-meta { margin: 0; font-size: 0.78rem; color: var(--text-dim); }

/* contact */

.section-contact { padding-bottom: 5.5rem; }
.contact-links { display: flex; flex-wrap: wrap; gap: 1.5rem; font-size: 0.95rem; }
.contact-links a {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.6rem 1rem;
  background: var(--bg-panel);
}
.contact-links a:hover {
  border-color: var(--accent);
  text-decoration: none;
  background: var(--accent-soft);
}

/* footer */

.site-footer {
  border-top: 1px solid var(--line-soft);
  padding: 1.6rem 0;
  color: var(--text-dim);
  font-size: 0.78rem;
}
.site-footer p { margin: 0; }


/* ============================== video clips ============================== */
/* Clips are lazy: js/main.js swaps data-src -> src and plays them only while
   they are on screen, so the page does not pull 28 MB of video on load. */

.clip-grid {
  display: grid;
  /* min() keeps the track from exceeding the container on a 320px phone */
  grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
  gap: 1rem;
  margin: 0 0 2.2rem;
}
.clip-grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 640px) { .clip-grid-2 { grid-template-columns: 1fr; } }

.clip { margin: 0 0 2.2rem; }
.clip-grid .clip { margin: 0; }

.clip video {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 9;         /* reserves height before the clip loads */
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  box-shadow: var(--shadow-soft);
}
.clip-wide video { aspect-ratio: 16 / 9; }   /* source is 16:9 — do not crop the landing */

.clip figcaption {
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--text-dim);
  padding-top: 0.5rem;
}
.clip figcaption::before { content: "\203A  "; color: var(--accent); }
.clip-wide figcaption { font-size: 0.88rem; max-width: 48rem; }

/* ============================== two-loop split ============================== */

.loop-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 0 0 2.2rem;
}
@media (max-width: 700px) { .loop-split { grid-template-columns: 1fr; } }

.loop-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.2rem 1.3rem;
}
.loop-tag {
  font-size: 0.7rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.45rem;
}
.loop-card h3 { font-size: 1.02rem; margin-bottom: 0.7rem; }
.loop-card ul { margin: 0; padding-left: 1.1rem; }
.loop-card li { color: var(--text-dim); font-size: 0.92rem; margin-bottom: 0.32rem; }
.loop-card li:last-child { margin-bottom: 0; }

/* ============================== callout ============================== */

.callout {
  margin-top: 2.4rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent-bright);
  border-radius: 10px;
  background: var(--accent-soft);
  padding: 1.2rem 1.4rem;
}
.callout-kicker {
  font-size: 0.7rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5rem;
}
.callout p { margin: 0 0 0.8rem; font-size: 0.95rem; }
.callout p:last-child { margin-bottom: 0; }

.btn-link {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.5rem 0.95rem;
  border-radius: 7px;
  border: 1px solid var(--accent);
  background: var(--bg-raised);
  color: var(--accent);
}
.btn-link:hover { background: var(--accent-soft); text-decoration: none; }

/* ============================== results table ============================== */

.sub-h { font-size: 1.15rem; margin-top: 2.6rem; }

.table-scroll { overflow-x: auto; margin: 0 0 0.9rem; }

.result-table {
  width: 100%;
  min-width: 33rem;
  border-collapse: collapse;
  font-size: 0.82rem;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.result-table th, .result-table td {
  text-align: left;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--line-soft);
}
.result-table thead th {
  color: var(--accent);
  font-weight: 500;
  white-space: nowrap;
  border-bottom: 1px solid var(--line);
}
.result-table tbody tr:last-child td { border-bottom: none; }
.result-table td.good { color: var(--green); font-weight: 700; }
.result-table td.bad  { color: var(--red); }

.fine-print { font-size: 0.85rem; color: var(--text-dim); max-width: 46rem; }

/* ============================== publication links ============================== */

.pub-links { margin: 0.55rem 0 0; display: flex; flex-wrap: wrap; gap: 1.1rem; font-size: 0.78rem; }

/* Clips whose source is not 16:9. The box must match the file, otherwise
   object-fit: cover silently crops — the slip-test pair is shot portrait
   on a phone (1280x2276). */
.clip-portrait video { aspect-ratio: 9 / 16; }

.clip-grid-portrait {
  grid-template-columns: repeat(auto-fit, minmax(min(180px, 100%), 260px));
  justify-content: center;
}