/* ---------- tokens ---------- */
:root {
  --bg: #111827;
  --bg-blur: rgba(17, 24, 39, 0.8);
  --card: #1f2937;
  --card-2: #273244;
  --line: #374151;
  --text: #d1d5db;
  --muted: #9ca3af;
  --head: #ffffff;
  --accent: #f6ad55;
  --accent-ink: #1a1206;
  --accent-soft: rgba(246, 173, 85, 0.14);
  --tile: #e5e7eb;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --serif: ui-serif, Georgia, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f6f7fb;
  --bg-blur: rgba(246, 247, 251, 0.85);
  --card: #ffffff;
  --card-2: #eef1f7;
  --line: #dde2ec;
  --text: #2b3445;
  --muted: #5c6779;
  --head: #0f1521;
  --accent: #b45309;
  --accent-ink: #ffffff;
  --accent-soft: rgba(180, 83, 9, 0.1);
  --tile: #f0f2f8;
  --shadow: 0 10px 30px rgba(15, 21, 33, 0.1);
  color-scheme: light;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s, color 0.3s;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p, ul, pre { margin: 0; }
ul { padding: 0; list-style: none; }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.wrap { width: min(1120px, 100% - 2rem); margin-inline: auto; }
.section { padding-block: 4.5rem 1rem; }
.section-title { font-size: 1.9rem; color: var(--head); text-align: center; letter-spacing: -0.01em; }
.section-sub { text-align: center; color: var(--muted); margin-top: 0.5rem; }

.skip {
  position: absolute; left: 1rem; top: -4rem; z-index: 100;
  background: var(--accent); color: var(--accent-ink); padding: 0.5rem 1rem; border-radius: 8px;
}
.skip:focus { top: 1rem; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg-blur);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 4rem; gap: 1rem; }
.brand { font-family: var(--serif); font-weight: 700; font-size: 1.4rem; color: var(--head); }
.nav-links { display: flex; align-items: center; gap: 0.25rem; }
.nav-links a {
  padding: 0.4rem 0.8rem; border-radius: 8px; font-size: 0.92rem; font-weight: 500; color: var(--muted);
  transition: color 0.2s, background-color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); background: var(--accent-soft); }
.nav-tools { display: flex; align-items: center; gap: 0.5rem; }
.icon-btn {
  display: grid; place-items: center; width: 2.4rem; height: 2.4rem;
  background: transparent; border: 1px solid var(--line); border-radius: 10px; color: var(--muted);
  transition: color 0.2s, border-color 0.2s, transform 0.2s;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.icon-btn svg { width: 1.15rem; height: 1.15rem; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.theme-toggle .sun { display: none; }
:root[data-theme="light"] .theme-toggle .sun { display: block; }
:root[data-theme="light"] .theme-toggle .moon { display: none; }
.menu-btn { display: none; }
.progress {
  position: absolute; left: 0; bottom: -1px; height: 2px; width: 100%;
  background: var(--accent); transform: scaleX(0); transform-origin: left;
}

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
#field { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.hero::after { /* fade the field into the page background */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse at 50% 45%, transparent 35%, var(--bg) 100%);
}
.hero-inner { position: relative; z-index: 2; text-align: center; padding-block: 5rem 3.5rem; pointer-events: none; }
.hero-inner a, .hero-inner button, .hero-inner input, .hero-inner .chip { pointer-events: auto; }
.avatar {
  width: 8rem; height: 8rem; border-radius: 50%; margin: 0 auto 1.5rem;
  border: 4px solid var(--card); box-shadow: 0 0 0 2px var(--accent), var(--shadow);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); pointer-events: auto; cursor: pointer;
}
.avatar:hover { transform: rotate(-6deg) scale(1.06); }
.hero h1 { font-size: clamp(2.2rem, 6vw, 3.4rem); color: var(--head); line-height: 1.1; letter-spacing: -0.02em; }
.role { color: var(--accent); font-size: clamp(1.1rem, 2.6vw, 1.5rem); margin-top: 0.6rem; font-weight: 500; }
.lede { max-width: 42rem; margin: 1.4rem auto 0; font-size: 1.1rem; }
.rot { color: var(--head); border-bottom: 2px solid var(--accent); white-space: nowrap; }
.caret { display: inline-block; width: 2px; height: 1.1em; background: var(--accent); margin-left: 2px; vertical-align: text-bottom; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.contact { margin-top: 1.4rem; color: var(--muted); font-size: 0.95rem; display: flex; gap: 0.6rem; justify-content: center; align-items: center; flex-wrap: wrap; }
.mini-btn {
  background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 0.15rem 0.75rem;
  font-size: 0.8rem; color: var(--text); transition: border-color 0.2s, color 0.2s;
}
.mini-btn:hover { border-color: var(--accent); color: var(--accent); }

.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-top: 1.8rem; }
.chip {
  display: inline-flex; align-items: center; gap: 0.45rem; padding: 0.35rem 0.85rem;
  background: var(--card); border: 1px solid var(--line); border-radius: 999px;
  font-size: 0.85rem; font-weight: 500; color: var(--text);
  transition: transform 0.2s, border-color 0.2s, color 0.2s;
}
.chip::before { content: ""; width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--dot, var(--accent)); }
.chip:hover { transform: translateY(-2px); border-color: var(--dot, var(--accent)); color: var(--head); }

.tempbox {
  margin: 2.2rem auto 0; max-width: 24rem; padding: 0.8rem 1.1rem; text-align: left;
  background: var(--bg-blur); border: 1px solid var(--line); border-radius: var(--radius);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.tempbox label { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.8rem; color: var(--muted); }
.tempbox output { color: var(--accent); font-family: var(--mono); }
.tempbox input[type="range"] { width: 100%; margin: 0.6rem 0 0.2rem; accent-color: var(--accent); }
.tempbox small { display: block; color: var(--muted); font-size: 0.72rem; }

/* ---------- filters ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-top: 1.6rem; }
.filter {
  padding: 0.35rem 1rem; border-radius: 999px; background: transparent; border: 1px solid var(--line);
  font-size: 0.88rem; font-weight: 500; color: var(--muted); transition: all 0.2s;
}
.filter:hover { color: var(--accent); border-color: var(--accent); }
.filter[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.count { text-align: center; color: var(--muted); font-size: 0.85rem; margin-top: 0.8rem; min-height: 1.4em; }

/* ---------- project cards ---------- */
.grid { display: grid; gap: 1.5rem; margin-top: 1.5rem; }
.grid.featured { grid-template-columns: repeat(auto-fit, minmax(min(100%, 30rem), 1fr)); }
.grid.more { grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr)); gap: 1.1rem; }
.sub-head { margin-top: 3rem; text-align: center; font-size: 1.15rem; color: var(--head); }
.card {
  position: relative; display: flex; flex-direction: column; overflow: hidden;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--shadow); }
.card[hidden] { display: none; }
.card-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; gap: 0.75rem; }
.card h3 { font-size: 1.3rem; color: var(--accent); line-height: 1.25; }
.card.small .card-body { padding: 1.2rem; }
.card.small h3 { font-size: 1.05rem; }
.card p { font-size: 0.95rem; }
.card-media { display: flex; align-items: center; justify-content: center; gap: 1rem; padding: 1.2rem; background: var(--card-2); }
.card-media .logo { width: 4.5rem; height: 4.5rem; object-fit: contain; }
.card-media .shot { max-height: 11rem; width: auto; border-radius: 10px; box-shadow: var(--shadow); }
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag { padding: 0.1rem 0.6rem; border-radius: 6px; background: var(--accent-soft); color: var(--accent); font-size: 0.75rem; font-weight: 600; }
.stars { margin-left: auto; color: var(--muted); font-size: 0.78rem; font-weight: 500; white-space: nowrap; }
.links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.2rem; margin-top: auto; padding-top: 0.5rem; }
.links a { font-weight: 600; font-size: 0.9rem; color: var(--accent); transition: color 0.2s; }
.links a::after { content: " \2197"; font-weight: 400; }
.links a:hover { color: var(--head); }
.apps { display: flex; flex-wrap: wrap; gap: 0.4rem; align-items: center; font-size: 0.8rem; color: var(--muted); }
.apps a { padding: 0.1rem 0.6rem; border: 1px solid var(--line); border-radius: 999px; transition: all 0.2s; }
.apps a:hover { border-color: var(--accent); color: var(--accent); }

/* tupper mini demo + probe illustration */
.tupper-wrap { width: 100%; max-width: 26rem; text-align: center; }
.tupper-wrap canvas {
  width: 100%; aspect-ratio: 106 / 17; image-rendering: pixelated;
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
}
.tupper-wrap input {
  width: 100%; margin-top: 0.7rem; padding: 0.4rem 0.8rem; text-align: center;
  background: var(--bg); color: var(--text); border: 1px solid var(--line); border-radius: 8px; font: inherit; font-size: 0.9rem;
}
.tupper-wrap input:focus-visible { border-color: var(--accent); }
.tupper-wrap small { display: block; margin-top: 0.5rem; color: var(--muted); font-size: 0.72rem; overflow-wrap: anywhere; }
.tupper-wrap code { font-family: var(--mono); color: var(--accent); }
.probe svg { color: var(--accent); }
.probe .flange, .probe .stage { fill: var(--card); stroke: currentColor; stroke-width: 2; }
.probe .rod { fill: currentColor; opacity: 0.55; }
.probe .wire { fill: none; stroke: currentColor; stroke-width: 1.5; opacity: 0.4; }
.probe .sample { fill: currentColor; animation: glow 2.4s ease-in-out infinite; }
.probe .frost { fill: none; stroke: #7dd3fc; stroke-width: 2; stroke-linecap: round; opacity: 0.7; }
@keyframes glow { 50% { opacity: 0.3; } }

/* ---------- citations ---------- */
.cite { border-top: 1px solid var(--line); margin-inline: -1.5rem; padding: 0.9rem 1.5rem 0; margin-top: 0.5rem; }
.cite summary { cursor: pointer; font-weight: 600; font-size: 0.9rem; color: var(--muted); list-style: none; }
.cite summary::-webkit-details-marker { display: none; }
.cite summary::before { content: "\25B8"; display: inline-block; margin-right: 0.4rem; transition: transform 0.2s; }
.cite[open] summary::before { transform: rotate(90deg); }
.cite summary:hover { color: var(--accent); }
.cite-tabs { display: flex; gap: 0.4rem; margin-top: 0.8rem; flex-wrap: wrap; }
.cite-tabs button {
  background: transparent; border: 1px solid var(--line); border-radius: 8px; padding: 0.2rem 0.7rem; font-size: 0.78rem; color: var(--muted);
}
.cite-tabs button[aria-selected="true"] { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.cite-box { position: relative; margin-top: 0.6rem; }
.cite-box[hidden] { display: none; }
.cite-box pre {
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 0.9rem; overflow: auto;
  font: 0.74rem/1.55 var(--mono); color: var(--text);
}
.cite-box .mini-btn { position: absolute; top: 0.5rem; right: 0.5rem; }
.cite-note { font-size: 0.75rem; color: var(--muted); margin-top: 0.4rem; }

/* ---------- activity ---------- */
.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; margin-top: 1.8rem; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 0.5rem; text-align: center; }
.stat b { display: block; font-size: clamp(1.5rem, 5vw, 2rem); color: var(--accent); font-variant-numeric: tabular-nums; line-height: 1.1; }
.stat span { font-size: 0.8rem; color: var(--muted); }
.panel { margin-top: 1rem; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.3rem; }
.panel h3 { font-size: 1rem; color: var(--head); margin-bottom: 0.9rem; }
.langbar { display: flex; height: 0.7rem; border-radius: 999px; overflow: hidden; background: var(--card-2); }
.langbar i { display: block; height: 100%; transition: flex-grow 0.8s; }
.legend { display: flex; flex-wrap: wrap; gap: 0.4rem 1.1rem; margin-top: 0.9rem; font-size: 0.82rem; color: var(--muted); }
.legend span::before { content: ""; display: inline-block; width: 0.6rem; height: 0.6rem; border-radius: 50%; background: var(--c); margin-right: 0.35rem; }
.recent li { display: flex; justify-content: space-between; gap: 1rem; padding: 0.55rem 0; border-top: 1px solid var(--line); font-size: 0.9rem; }
.recent li:first-child { border-top: 0; }
.recent a { color: var(--accent); font-weight: 600; }
.recent a:hover { color: var(--head); }
.recent time { color: var(--muted); font-size: 0.8rem; white-space: nowrap; }
.status { text-align: center; color: var(--muted); font-size: 0.9rem; margin-top: 1.4rem; }
.status a { color: var(--accent); }

/* ---------- toolkit ---------- */
.toolkit { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; margin-top: 1.8rem; }
.tool {
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem; width: 5.6rem;
  font-size: 0.75rem; color: var(--muted); transition: transform 0.25s, color 0.25s;
}
.tool span.tile {
  display: grid; place-items: center; width: 4.2rem; height: 4.2rem; border-radius: 16px;
  background: var(--tile); border: 1px solid var(--line); transition: box-shadow 0.25s, border-color 0.25s;
}
.tool img { width: 2.4rem; height: 2.4rem; object-fit: contain; }
.tool:hover { transform: translateY(-5px) rotate(-3deg); color: var(--accent); }
.tool:hover .tile { border-color: var(--accent); box-shadow: var(--shadow); }

/* ---------- footer + toast ---------- */
.footer { margin-top: 5rem; padding-block: 2.5rem; text-align: center; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem; }
.footer a { color: var(--text); text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 3px; }
.footer a:hover { color: var(--accent); text-decoration-color: var(--accent); }
.footer p + p { margin-top: 0.4rem; font-size: 0.82rem; }
.toast {
  position: fixed; left: 50%; bottom: 1.5rem; z-index: 200; transform: translate(-50%, 1rem);
  background: var(--accent); color: var(--accent-ink); padding: 0.55rem 1.1rem; border-radius: 999px;
  font-size: 0.88rem; font-weight: 600; box-shadow: var(--shadow); pointer-events: none;
  opacity: 0; visibility: hidden; transition: opacity 0.25s, transform 0.25s, visibility 0.25s;
}
.toast.show { transform: translate(-50%, 0); opacity: 1; visibility: visible; }
.to-top {
  position: fixed; right: 1.2rem; bottom: 1.2rem; z-index: 40; opacity: 0; pointer-events: none;
  background: var(--card); transition: opacity 0.3s, transform 0.2s, color 0.2s, border-color 0.2s;
}
.to-top.show { opacity: 1; pointer-events: auto; }

/* ---------- scroll reveal ---------- */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; transition-delay: var(--d, 0s); }
.js .reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .menu-btn { display: grid; }
  .nav-links {
    position: absolute; top: 4rem; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--line); padding: 0.5rem 1rem 1rem;
    display: none;
  }
  .nav.open .nav-links { display: flex; }
  .nav-links a { padding: 0.8rem 0.6rem; }
  .hero-inner { padding-block: 3.5rem 2.5rem; }
  .cite { margin-inline: -1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}

@media print {
  .nav, #field, .tempbox, .filters, .to-top, .toast { display: none !important; }
  body { background: #fff; color: #000; }
}