/* --- Palette ---
   Inspired by deep-navy + electric-blue/violet palettes.
   Required base colors from brief are kept as named vars and used for surfaces.

   --bg-deep:     #0A0E1A   deep navy page background
   --bg:          #141A2E   base panel background
   --surface:     #1A2240   raised surface
   --muted:       #2A2147   muted panel / border tint (derived from #413F54)
   --plum:        #413F54   plum (brief palette)
   --charcoal:    #3F4045   neutral charcoal (brief palette)
   --slate:       #30292F   warm slate (brief palette)
   --indigo:      #5F5AA2   indigo accent (brief palette)
   --royal:       #355691   royal blue (brief palette)
   --blue:        #2563EB   electric blue — primary accent
   --violet:      #7C3AED   electric violet — secondary accent
   --cyan:        #38BDF8   cyan highlight
   --pink:        #EC4899   warm accent (used sparingly)
*/

:root {
  --bg-deep: #0A0E1A;
  --bg: #141A2E;
  --surface: #1A2240;
  --muted: #2A2147;
  --plum: #413F54;
  --charcoal: #3F4045;
  --slate: #30292F;
  --indigo: #5F5AA2;
  --royal: #355691;
  --blue: #2563EB;
  --violet: #7C3AED;
  --cyan: #38BDF8;
  --pink: #EC4899;

  /* Single accent. Cyan reads "technical instrument" against the deep navy
     and keeps the palette disciplined. --accent-2 is a muted neutral for
     subtle differentiation when one accent isn't enough. */
  --accent: var(--cyan);
  --accent-2: rgba(255, 255, 255, 0.12);
  --text: #ECEAF1;
  --text-dim: #A9A6B4;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 10px;
  --maxw: 880px;
  --font: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* Offset anchor targets so they don't land under the sticky nav. */
#projects, #experience { scroll-margin-top: 80px; }

html, body {
  margin: 0;
  padding: 0;
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100%;
}
html { background: var(--bg-deep); }

body {
  background: transparent;
  position: relative;
}

/* Subtle single-accent ambient wash. No dot matrix; the page stays calm. */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 600px at 85% -10%, rgba(56, 189, 248, 0.10), transparent 60%),
    radial-gradient(800px 500px at -10% 10%, rgba(56, 189, 248, 0.06), transparent 60%);
  pointer-events: none;
}

a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
a:hover { color: var(--accent); border-bottom-color: var(--accent); }

main, header, footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Top nav (sticky, gains a frosted background on scroll) --- */
.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px max(24px, calc((100% - var(--maxw)) / 2));
  max-width: none;
  margin: 0;
  position: sticky;
  top: 0;
  z-index: 50;
  background: transparent;
  border-bottom: 1px solid transparent;
  /* Only transition properties that don't reflow layout — animating padding or
     height causes subpixel jitter on the nav's text. */
  transition: background-color 0.25s ease, border-color 0.25s ease;
  will-change: background-color;
}
.top-nav.scrolled {
  background: rgba(10, 14, 26, 0.72);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom-color: var(--border);
}
.brand {
  font-weight: 600;
  letter-spacing: 0.02em;
  font-size: 1rem;
  color: var(--text);
  border: none;
}
.brand:hover { color: var(--accent); border: none; }
.nav-links { display: flex; gap: 22px; font-size: 0.92rem; color: var(--text-dim); }
.nav-links a { color: var(--text-dim); border: none; }
.nav-links a:hover { color: var(--accent); border: none; }

/* --- Hero --- */
.hero {
  padding: 32px 0 16px;
}
.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 12px;
}
.hero h1 {
  font-size: 2.6rem;
  font-weight: 700;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
  color: var(--text);
}
.hero-headline {
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--text);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.hero .lede {
  color: var(--text-dim);
  margin: 0 0 18px;
  max-width: 60ch;
}
.hero .quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.quick-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
  transition: all 0.18s ease;
}
.quick-link:nth-child(1) {
  background: var(--cyan);
  border-color: transparent;
  color: var(--bg-deep);
}
.quick-link:nth-child(1):hover { filter: brightness(1.08); border-color: transparent; }
.quick-link:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(56, 189, 248, 0.08);
}
.quick-link .arrow { font-size: 0.85em; opacity: 0.85; }

/* --- Section headers --- */
.section {
  padding: 40px 0 8px;
}
.section h2 {
  font-size: 1.05rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  margin: 0 0 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section h2::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--cyan);
}

/* --- Project list (image-forward cards) --- */
.year-group { margin-bottom: 36px; }
.year-label {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--cyan);
  letter-spacing: 0.1em;
  margin: 0 0 14px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.project-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.project-item { margin: 0; }
.project-link {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  background: rgba(20, 26, 46, 0.62);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
/* Stretched link: the title's invisible ::before covers the whole card so
   clicking anywhere navigates to the project page. The View Code button sits
   at a higher z-index so it intercepts its own clicks. */
.project-title-link {
  color: inherit;
  border-bottom: none;
  text-decoration: none;
}
.project-title-link:hover { border-bottom: none; color: inherit; }
.project-title-link::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
}
.project-link:hover {
  border-color: rgba(56, 189, 248, 0.45);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px -16px rgba(56, 189, 248, 0.30);
  color: var(--text);
}
.project-link:hover .project-title { color: var(--cyan); }
.project-link:hover .project-thumb img { transform: scale(1.03); }
.project-thumb {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--muted);
  overflow: hidden;
  position: relative;
}
.project-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(10, 14, 26, 0.55) 100%);
  pointer-events: none;
}
.project-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease;
}
.project-meta {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 18px 20px 20px;
}
.project-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}
.project-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  transition: color 0.15s ease;
}
.project-date {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  white-space: nowrap;
}
.project-tagline {
  margin: 0 0 12px;
  color: var(--text-dim);
  font-size: 0.97rem;
  line-height: 1.55;
}
/* Reserve space for up to two rows of tag pills so the View Code button
   aligns across cards even when shorter tag lists fit on one row. */
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-content: flex-start;
  min-height: calc(2 * 1.5rem + 6px);
}
.project-actions {
  margin-top: auto;
  padding-top: 14px;
  display: flex;
  gap: 10px;
}
.view-code {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
}
.view-code:hover {
  border-color: rgba(56, 189, 248, 0.55);
  background: rgba(56, 189, 248, 0.12);
  color: var(--cyan);
}
.view-code svg { display: block; }
@media (min-width: 720px) {
  .project-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  /* The first project of the most-recent year group is the "newest" — it
     gets a full-width feature row above the uniform half-width grid below. */
  .year-group:first-of-type .project-list .project-item:first-child {
    grid-column: 1 / -1;
  }
  /* If a year group has only one project, let it fill the row rather than
     leaving an awkward empty cell. */
  .project-list .project-item:only-child {
    grid-column: 1 / -1;
  }
  /* Featured + lone cards keep 4:3 (so the full image is visible, no crop)
     but are capped to ~540px wide and centered, so they're only a little
     larger than the half-width cards beneath them. */
  .year-group:first-of-type .project-list .project-item:first-child .project-link,
  .project-list .project-item:only-child .project-link {
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
  }
}
/* Monochrome spec-sheet pills: uppercase mono label, hairline border, no fill. */
.tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2px 9px;
  border-radius: 3px;
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}

/* --- Project page --- */
.project-page header.page-head {
  padding: 24px 0 8px;
}
.back-link {
  font-size: 0.88rem;
  color: var(--text-dim);
  border: none;
}
.back-link:hover { color: var(--accent); border: none; }
.project-page h1 {
  font-size: 1.9rem;
  margin: 14px 0 8px;
  font-weight: 600;
}
.project-page .subtitle {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin: 0 0 8px;
  max-width: 65ch;
}
.project-page .meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  margin: 18px 0 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}
/* Each <h2> on a project page starts a new section. No frosted card —
   sections sit in one continuous reading column separated by a hairline
   rule at the top, like a technical document. Wrapping is done at runtime
   in js/project-page.js. */
.project-page main > section > .panel {
  padding: 28px 0 8px;
  margin-bottom: 12px;
  border-top: 1px solid var(--border);
}
.project-page main > section > .panel:first-of-type {
  border-top: none;
  padding-top: 20px;
}
/* Cap prose width inside each section for readability (~70ch). Figures and
   grids stay full-width by escaping this cap. */
.project-page main > section > .panel > p,
.project-page main > section > .panel > ul,
.project-page main > section > .panel > ol,
.project-page main > section > .panel > h3 {
  max-width: 70ch;
}

.project-page h2 {
  font-size: 1.6rem;
  margin: 6px 0 18px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}
.repo-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.9rem;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
}
.repo-link:hover {
  border-color: rgba(56, 189, 248, 0.5);
  background: rgba(56, 189, 248, 0.10);
  color: var(--cyan);
}
.repo-link .arrow { opacity: 0.7; }
.project-page h3 {
  font-size: 1rem;
  margin: 24px 0 8px;
  color: var(--text);
}
.project-page p { color: var(--text); }
.project-page ul { padding-left: 20px; }
.project-page li { margin-bottom: 8px; }
.project-page figure.hero-fig {
  margin: 0 0 28px;
}
.project-page figure.hero-fig img,
.project-page figure.hero-fig video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--muted);
}
/* Light-tile variant for hero figures whose subject is a diagram /
   white-background render (e.g., R500 architecture diagram). */
.project-page figure.hero-fig.contain img {
  object-fit: contain;
  padding: 22px;
  background: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.14);
}
/* Detail figures (e.g., diagrams, reports) — preserve the image's natural
   aspect ratio so fine text stays legible instead of being letterboxed. */
.project-page figure.hero-fig.detail-fig img {
  aspect-ratio: auto;
  height: auto;
  max-height: 85vh;
}
.project-page figure.hero-fig figcaption {
  font-size: 0.85rem;
  color: var(--text-dim);
  text-align: center;
  margin-top: 8px;
}
.fig-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin: 18px 0 8px;
}
.fig-grid figure { margin: 0; }
.fig-grid figcaption {
  font-size: 0.82rem;
  color: var(--text-dim);
  text-align: center;
  margin-top: 8px;
}
.fig-grid img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--muted);
}
/* For images where the whole subject must stay visible (CAD/PCB renders,
   diagrams, screenshots). Lets the image fit inside the tile instead of
   cropping. Per-image tile colors sampled from each source so the tile blends
   with the image's own background. */
.fig-grid.contain img {
  object-fit: contain;
  padding: 16px;
  background: #F2F2F2;
  border-color: rgba(255, 255, 255, 0.14);
}
/* Per-image tile color overrides (sampled from each PNG). */
.fig-grid.contain img[src$="lfr-chassis.png"]    { background: #FBFBFB; }
.fig-grid.contain img[src$="lfr-sensor-pcb.png"] { background: #F6F6F6; }
.fig-grid.contain img[src$="lfr-stm32-pcb.png"]  { background: #F7F7F7; }
.fig-grid.contain img[src$="rh-finger.png"]      { background: #817E77; }
.fig-grid.contain img[src$="rh-palm.png"]        { background: #383B3F; }
.fig-grid.contain img[src$="rh-base.png"]        { background: #F9F9F9; }
.fig-grid.contain img[src$="rh-pcb.png"]         { background: #F4F4F4; }
.fig-grid.contain img[src$="r500-toplevel.png"]  { background: #FFFFFF; }
.fig-grid.contain img[src$="r500-util.png"]      { background: #EBEBEB; }
.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin: 16px 0;
}
.metric {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  position: relative;
  overflow: hidden;
}
.metric::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  background: var(--cyan);
}
.metric .label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.metric .value {
  font-family: var(--mono);
  font-size: 1.15rem;
  color: var(--cyan);
}

/* --- Footer --- */
footer {
  padding: 48px 24px 36px;
  color: var(--text-dim);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
footer .socials { display: flex; gap: 14px; }
footer a { color: var(--text-dim); border: none; }
footer a:hover { color: var(--accent); border: none; }

/* --- Work Experience (Website1-style card list) --- */
.experience-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.exp-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  background: rgba(255, 255, 255, 0.02);
  position: relative;
  transition: border-color 0.18s ease, transform 0.18s ease;
}
.exp-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 10px;
}
.exp-logo {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: contain;
  background: rgba(255, 255, 255, 0.06);
  padding: 4px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.exp-titles {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.exp-company {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0;
  color: var(--text);
}
.exp-role {
  font-size: 1rem;
  font-weight: 500;
  color: var(--cyan);
  margin: 0;
}
.exp-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.exp-meta .meta-item { display: inline-flex; align-items: center; gap: 6px; }
.exp-bullets {
  margin: 0;
  padding-left: 20px;
  color: var(--text);
  font-size: 0.94rem;
}
.exp-bullets li { margin-bottom: 6px; }
.exp-bullets li::marker { color: var(--cyan); }
.exp-summary {
  margin: 0;
  color: var(--text);
  font-size: 0.94rem;
  line-height: 1.6;
}

/* --- In-page TOC (floating sidebar on project pages) --- */
.page-toc {
  position: fixed;
  top: 96px;
  right: 24px;
  width: 200px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  font-size: 0.82rem;
  padding: 14px 16px;
  background: rgba(20, 26, 46, 0.55);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  border: 1px solid var(--border);
  border-radius: 10px;
  z-index: 5;
}
.page-toc ul { list-style: none; padding: 0; margin: 0; }
.page-toc li { margin: 6px 0; }
.page-toc a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: none;
  display: block;
  padding: 2px 0 2px 10px;
  border-left: 2px solid transparent;
  line-height: 1.35;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.page-toc a:hover { color: var(--text); }
.page-toc a.active {
  color: var(--accent);
  border-left-color: var(--accent);
}
@media (max-width: 1180px) {
  .page-toc { display: none; }
}

/* Click-to-zoom on figure images. */
.project-page figure a.img-zoom {
  display: block;
  border-bottom: none;
  cursor: zoom-in;
}
.project-page figure a.img-zoom:hover { border-bottom: none; }

/* Smooth-scroll for TOC anchors, with offset for the sticky nav. */
html { scroll-behavior: smooth; }
.project-page h2[id] { scroll-margin-top: 80px; }

/* --- Mobile --- */
@media (max-width: 560px) {
  .top-nav { padding-left: 18px; padding-right: 18px; }
  main, header, footer { padding-left: 18px; padding-right: 18px; }
  .hero h1 { font-size: 1.9rem; }
  .project-row { flex-direction: column; align-items: flex-start; gap: 2px; }
  .project-meta { padding: 14px 16px 16px; }
  .project-title { font-size: 1.1rem; }
}