:root {
  --bg: #0b0e12;
  --surface: #12161c;
  --surface-2: #181d25;
  --line: #242b35;
  --text: #e6e9ee;
  --muted: #8b95a3;
  --accent: #3ddc97;
  --accent-soft: rgba(61, 220, 151, 0.12);
  --warn: #f5b84a;
  --grid: rgba(139, 149, 163, 0.07);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  --max: 1080px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f7f7f4; --surface: #ffffff; --surface-2: #f0f0eb; --line: #e1e1d9;
    --text: #14181d; --muted: #5b6470; --accent: #0c8f59; --accent-soft: rgba(12, 143, 89, 0.1);
    --warn: #b7791f; --grid: rgba(20, 24, 29, 0.05); --shadow: 0 10px 30px rgba(20, 24, 29, 0.08);
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #f7f7f4; --surface: #ffffff; --surface-2: #f0f0eb; --line: #e1e1d9;
  --text: #14181d; --muted: #5b6470; --accent: #0c8f59; --accent-soft: rgba(12, 143, 89, 0.1);
  --warn: #b7791f; --grid: rgba(20, 24, 29, 0.05); --shadow: 0 10px 30px rgba(20, 24, 29, 0.08);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.65 var(--sans); -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.accent { color: var(--accent); }

/* Placeholder marker: anything still to be filled in */
.tbd {
  outline: 1px dashed var(--warn); outline-offset: 3px; border-radius: 4px;
}
.tbd-tag {
  font: 500 10px/1 var(--mono); color: var(--warn); border: 1px solid var(--warn);
  padding: 2px 5px; border-radius: 3px; vertical-align: middle; margin-left: 6px;
  letter-spacing: 0.05em;
}

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 10; backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 60px; }
.logo { font: 600 14px var(--mono); text-decoration: none; }
.logo span { color: var(--accent); }
.nav-links { display: flex; gap: 20px; margin-left: auto; }
.nav-links a { font: 13px var(--mono); color: var(--muted); text-decoration: none; }
.nav-links a:hover { color: var(--text); }
.theme-btn {
  background: none; border: 1px solid var(--line); color: var(--muted); border-radius: 6px;
  width: 36px; height: 36px; cursor: pointer; display: grid; place-items: center;
}
.theme-btn:hover { color: var(--text); border-color: var(--muted); }
.theme-btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.theme-btn .i-moon { display: none; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .theme-btn .i-sun { display: none; }
  :root:not([data-theme="dark"]) .theme-btn .i-moon { display: block; }
}
:root[data-theme="light"] .theme-btn .i-sun { display: none; }
:root[data-theme="light"] .theme-btn .i-moon { display: block; }

.skip { position: absolute; left: 16px; top: -48px; z-index: 20; background: var(--accent); color: #06130d; padding: 8px 12px; border-radius: 6px; font: 500 13px var(--mono); }
.skip:focus { top: 12px; }
a:focus-visible, button:focus-visible, .diagram .node:focus-visible rect { outline: 2px solid var(--accent); outline-offset: 3px; }
@media (max-width: 720px) { .nav-links { display: none; } .theme-btn { margin-left: auto; } }

/* Sections */
section { padding: 88px 0; border-bottom: 1px solid var(--line); }
.eyebrow {
  font: 500 12px var(--mono); color: var(--accent); letter-spacing: 0.08em;
  text-transform: uppercase; margin: 0 0 12px;
}
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.02em; margin: 0; }
h2 { font-size: clamp(26px, 4vw, 36px); margin-bottom: 16px; }
h3 { font-size: 18px; }
.lead { font-size: 18px; color: var(--muted); max-width: 680px; margin: 0 0 40px; }

/* Hero */
.hero { padding: 112px 0 88px; position: relative; overflow: hidden; }
.prompt { font: 15px var(--mono); color: var(--muted); margin: 0 0 18px; min-height: 1.6em; }
.prompt .caret {
  display: inline-block; width: 8px; height: 1.1em; background: var(--accent);
  vertical-align: -3px; margin-left: 2px; animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.hero h1 { font-size: clamp(38px, 7vw, 72px); font-weight: 700; margin-bottom: 20px; }
.hero .tagline { font-size: clamp(18px, 2.4vw, 22px); color: var(--muted); max-width: 640px; margin: 0 0 36px; }
.btns { display: flex; flex-wrap: wrap; gap: 12px; }
.status-line {
  margin-top: 56px; display: flex; flex-wrap: wrap; gap: 8px 22px;
  font: 12px var(--mono); color: var(--muted);
}
.status-line b { color: var(--text); font-weight: 500; }
.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); margin-right: 6px; box-shadow: 0 0 0 3px var(--accent-soft); }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 8px;
  font: 500 14px var(--mono); text-decoration: none; border: 1px solid var(--line);
  background: var(--surface); transition: border-color .2s, transform .2s;
}
.btn:hover { border-color: var(--muted); transform: translateY(-1px); }
.btn.primary { background: var(--accent); color: #06130d; border-color: var(--accent); }

/* git log timeline */
.gitlog { position: relative; margin: 0; padding: 0; list-style: none; }
.gitlog::before {
  content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px; background: var(--line);
}
.commit { position: relative; padding: 0 0 34px 40px; }
.commit::before {
  content: ""; position: absolute; left: 0; top: 6px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--muted);
}
.commit.head::before { border-color: var(--accent); background: var(--accent); box-shadow: 0 0 0 5px var(--accent-soft); }
.commit-meta { font: 12px var(--mono); color: var(--muted); display: flex; flex-wrap: wrap; gap: 4px 12px; margin-bottom: 4px; }
.commit-meta .hash { color: var(--warn); }
.commit-meta .tag { color: var(--accent); border: 1px solid var(--accent); border-radius: 3px; padding: 0 6px; }
.commit h3 { margin-bottom: 4px; }
.commit p { margin: 0; color: var(--muted); max-width: 640px; }

.story { display: grid; grid-template-columns: 1fr 1.3fr; gap: 64px; }
.story-text p { margin: 0 0 16px; }
@media (max-width: 860px) { .story { grid-template-columns: 1fr; gap: 40px; } }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.stat { background: var(--surface); padding: 26px 22px; }
.stat .num { font: 600 34px/1 var(--mono); letter-spacing: -0.03em; }
.stat .label { font-size: 13px; color: var(--muted); margin-top: 10px; }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* Project cards */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
  display: flex; flex-direction: column; text-decoration: none; transition: border-color .2s, transform .2s;
}
a.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card.featured { grid-column: 1 / -1; display: grid; grid-template-columns: 1.35fr 1fr; }
.card-media { background: var(--surface-2); border-bottom: 1px solid var(--line); aspect-ratio: 16 / 10; overflow: hidden; position: relative; }
.card.featured .card-media { border-bottom: 0; border-right: 1px solid var(--line); aspect-ratio: auto; min-height: 320px; }
.card-media img { width: 100%; height: 100%; object-fit: cover; object-position: left top; }
.card-body { padding: 24px; display: flex; flex-direction: column; gap: 12px; }
.card-body p { margin: 0; color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font: 12px var(--mono); padding: 3px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.chip.plain { background: var(--surface-2); color: var(--muted); }
.more { font: 500 13px var(--mono); color: var(--accent); margin-top: auto; }
.mock-label {
  position: absolute; left: 10px; bottom: 10px; font: 10px var(--mono); color: var(--muted);
  background: var(--surface); border: 1px solid var(--line); padding: 2px 7px; border-radius: 4px;
}
@media (max-width: 860px) {
  .cards { grid-template-columns: 1fr; }
  .card.featured { grid-template-columns: 1fr; }
  .card.featured .card-media { border-right: 0; border-bottom: 1px solid var(--line); min-height: 0; aspect-ratio: 16 / 10; }
}

/* NDA-safe mockup drawn in CSS */
.mock { position: absolute; inset: 14px; display: grid; grid-template-columns: 22% 1fr; gap: 10px; }
.mock-side, .mock-main { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 10px; display: flex; flex-direction: column; gap: 7px; }
.bar { height: 7px; border-radius: 4px; background: var(--line); }
.bar.a { background: var(--accent); opacity: .7; width: 70%; }
.mock-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; }
.mock-kpi { border: 1px solid var(--line); border-radius: 6px; padding: 7px; display: flex; flex-direction: column; gap: 5px; }
.mock-chart { flex: 1; border: 1px solid var(--line); border-radius: 6px; }
.mock-chart svg { width: 100%; height: 100%; }

/* Stack layers */
.layers { display: flex; flex-direction: column; gap: 10px; }
.layer {
  display: grid; grid-template-columns: 170px 1fr; gap: 20px; align-items: start;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px;
}
.layer-name { font: 500 13px var(--mono); color: var(--accent); padding-top: 4px; }
.layer-name small { display: block; color: var(--muted); font-size: 11px; margin-top: 2px; }
.tools { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px 20px; }
.tool b { font-weight: 600; font-size: 15px; }
.tool span { display: block; font-size: 13px; color: var(--muted); line-height: 1.5; }
@media (max-width: 720px) { .layer { grid-template-columns: 1fr; gap: 10px; } }

/* Threat -> defence */
.threats { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.threat { display: grid; grid-template-columns: 1fr 32px 1.4fr; align-items: center; gap: 12px; padding: 16px 20px; background: var(--surface); }
.threat + .threat { border-top: 1px solid var(--line); }
.threat-head { background: var(--surface-2); font: 500 12px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .06em; padding: 12px 20px; }
.threat .arrow { color: var(--accent); font-family: var(--mono); text-align: center; }
.threat .def b { display: block; }
.threat .def span { font-size: 13px; color: var(--muted); }
@media (max-width: 720px) {
  .threat { grid-template-columns: 1fr; gap: 4px; }
  .threat .arrow { text-align: left; }
  .threat-head { display: none; }
}

/* Hero option D: terminal output + stack grid */
.hero-row { display: grid; grid-template-columns: 1fr auto; gap: 48px; align-items: end; }
.term { font: 14px/1.9 var(--mono); color: var(--muted); margin-top: 40px; }
.term .cmd { color: var(--text); }
.term .cmd::before { content: "$ "; color: var(--accent); }
.term .out { padding-left: 16px; margin-bottom: 6px; }
.led { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 10px); grid-auto-columns: 10px; gap: 3px; }
.led i { border-radius: 2px; background: var(--surface-2); outline: 1px solid var(--line); outline-offset: -1px;
         transition: background-color .45s ease, outline-color .45s ease; }
.led i[data-l="1"] { background: color-mix(in srgb, var(--accent) 22%, var(--surface-2)); outline-color: transparent; }
.led i[data-l="2"] { background: color-mix(in srgb, var(--accent) 45%, var(--surface-2)); outline-color: transparent; }
.led i[data-l="4"] { background: var(--accent); outline-color: transparent; }
.led-cap { font: 13px var(--mono); color: var(--muted); margin-top: 12px; min-height: 1.5em; }
.led-cap .cmd::before { content: "$ "; color: var(--accent); }
.led-cap b { color: var(--text); font-weight: 500; }
@media (max-width: 860px) { .hero-row { grid-template-columns: 1fr; gap: 32px; } }
@media (max-width: 480px) {
  .led { grid-template-rows: repeat(7, 7px); grid-auto-columns: 7px; gap: 2px; }
}

/* Numbers strip: five tiles */
.stats.five { grid-template-columns: repeat(5, 1fr); }
.stats.five .num { font-size: 30px; }
@media (max-width: 860px) { .stats.five { grid-template-columns: repeat(2, 1fr); } .stats.five .stat:last-child { grid-column: 1 / -1; } }

/* git log: Designed / Led / Impact lines */
.dli { margin: 6px 0 0; padding: 0; list-style: none; color: var(--muted); font-size: 15px; max-width: 640px; }
.dli li { margin-bottom: 3px; }
.dli b { font: 500 11px var(--mono); color: var(--accent); text-transform: uppercase; letter-spacing: .06em; margin-right: 6px; }
.commit .one { margin: 2px 0 0; }

/* Architecture sketch inside a card (NDA-safe, no real UI) */
.arch { position: absolute; inset: 0; display: grid; place-items: center; padding: 18px; }
.arch svg { width: 100%; height: auto; max-height: 100%; }
.arch rect { fill: var(--surface); stroke: var(--line); stroke-width: 1.5; }
.arch rect.hot { stroke: var(--accent); }
.arch text { fill: var(--text); font: 600 12px var(--sans); }
.arch text.sub { fill: var(--muted); font: 10px var(--mono); }
.arch path { fill: none; stroke: var(--muted); stroke-width: 1.4; opacity: .6; }
.arch .lbl { fill: var(--accent); font: 10px var(--mono); }

/* Stack: five pillars */
.pillars { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.pillar { display: grid; grid-template-columns: 170px 1fr; gap: 20px; padding: 18px 20px; background: var(--surface); }
.pillar + .pillar { border-top: 1px solid var(--line); }
.pillar-name { font: 600 15px var(--mono); color: var(--accent); }
.pillar-name small { display: block; font: 11px var(--mono); color: var(--muted); margin-top: 2px; }
.pillar p { margin: 0 0 8px; }
.proof { display: flex; flex-wrap: wrap; gap: 6px; }
.proof .chip { border-radius: 6px; }
@media (max-width: 720px) { .pillar { grid-template-columns: 1fr; gap: 6px; } }

/* Education & beyond the code */
.about { display: grid; grid-template-columns: 1.15fr 1fr; gap: 48px; }
.route { display: flex; align-items: center; gap: 8px; font: 12px var(--mono); color: var(--muted); margin: 0 0 18px; flex-wrap: wrap; }
.route b { color: var(--text); font-weight: 500; }
.route i { width: 22px; height: 1px; background: var(--accent); display: inline-block; }
.edu { list-style: none; margin: 0; padding: 0; }
.edu li { padding: 12px 0; border-top: 1px solid var(--line); }
.edu li:first-child { border-top: 0; padding-top: 0; }
.edu .t { font-weight: 600; }
.edu .s { color: var(--muted); font-size: 14px; }
.edu .s.sub { padding-left: 14px; border-left: 2px solid var(--line); margin-top: 6px; }
.recog h3 { font: 500 12px var(--mono); color: var(--accent); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 8px; }
.recog ul { list-style: none; margin: 0 0 22px; padding: 0; }
.recog li { margin-bottom: 6px; font-size: 15px; }
.recog li span { color: var(--muted); }
@media (max-width: 860px) { .about { grid-template-columns: 1fr; gap: 32px; } }

/* ~/lab */
.lab { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.lab a { display: flex; flex-direction: column; gap: 8px; padding: 18px; border: 1px solid var(--line); border-radius: 12px;
         background: var(--surface); text-decoration: none; transition: border-color .2s; }
.lab a:hover { border-color: var(--accent); }
.lab b { font-size: 15px; }
.lab span { font-size: 13px; color: var(--muted); }
.lab .chip { align-self: flex-start; margin-top: auto; }
@media (max-width: 860px) { .lab { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .lab { grid-template-columns: 1fr; } }

/* Project pages: data tables, galleries, role list */
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
.tbl { width: 100%; border-collapse: collapse; font-size: 15px; background: var(--surface); }
.tbl th { text-align: left; font: 500 11px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .07em;
          background: var(--surface-2); padding: 11px 16px; }
.tbl td { padding: 12px 16px; border-top: 1px solid var(--line); vertical-align: top; }
.tbl td:first-child { font-weight: 600; white-space: nowrap; }
.tbl tr.hi td { background: var(--accent-soft); }
.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.gallery figure { margin: 0; }
.gallery .shot img { width: 100%; }
@media (max-width: 720px) { .gallery { grid-template-columns: 1fr; } }
.streams { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.stream { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 22px; }
.stream h3 { margin-bottom: 6px; }
.stream .k { font: 500 11px var(--mono); color: var(--accent); text-transform: uppercase; letter-spacing: .07em; margin-bottom: 10px; }
.stream ul { margin: 10px 0 0; padding-left: 18px; color: var(--muted); font-size: 15px; }
.stream li { margin-bottom: 4px; }
@media (max-width: 860px) { .streams { grid-template-columns: 1fr; } }
.role { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.role li { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 14px 18px; }
.role b { font: 500 11px var(--mono); color: var(--accent); text-transform: uppercase; letter-spacing: .07em; margin-right: 8px; }

/* Contact / footer */
.contact { text-align: center; border-bottom: 0; }
.contact .lead { margin-left: auto; margin-right: auto; }
.contact .btns { justify-content: center; }
footer { padding: 28px 0 40px; font: 12px var(--mono); color: var(--muted); text-align: center; }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* Case study */
.crumb { font: 13px var(--mono); color: var(--muted); text-decoration: none; }
.crumb:hover { color: var(--accent); }
.cs-hero { padding: 72px 0 56px; }
.cs-hero h1 { font-size: clamp(34px, 6vw, 56px); margin: 18px 0 14px; display: flex; align-items: center; gap: 16px; }
.cs-hero h1 img { width: 56px; height: 56px; }
.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 36px; }
.fact .k { font: 11px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.fact .v { font-size: 15px; margin-top: 4px; }
@media (max-width: 720px) { .facts { grid-template-columns: repeat(2, 1fr); } }
.shot { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; box-shadow: var(--shadow); }
.caption { font-size: 13px; color: var(--muted); margin-top: 10px; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
@media (max-width: 860px) { .two { grid-template-columns: 1fr; } }

.diagram-box {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
}
.diagram-scroll { overflow-x: auto; }
.diagram { width: 100%; min-width: 680px; height: auto; display: block; }
.diagram .node rect { fill: var(--surface-2); stroke: var(--line); stroke-width: 1.5; transition: stroke .2s; }
.diagram .node.ext rect { stroke-dasharray: 5 4; }
.diagram .node:hover rect, .diagram .node:focus rect, .diagram .node.active rect { stroke: var(--accent); }
.diagram .node { cursor: pointer; outline: none; }
.diagram .node text { fill: var(--text); font: 600 13px var(--sans); }
.diagram .node text.sub { fill: var(--muted); font: 10.5px var(--mono); }
.diagram .edge { fill: none; stroke: var(--muted); stroke-width: 1.4; opacity: .55; }
.diagram .edge-label { fill: var(--muted); font: 10px var(--mono); }
.diagram .flow { fill: var(--accent); }
.diagram .group { fill: none; stroke: var(--accent); stroke-opacity: .35; stroke-dasharray: 3 5; }
.diagram .group-label { fill: var(--accent); font: 10.5px var(--mono); opacity: .8; }
.diagram-info {
  margin-top: 16px; padding: 14px 16px; border-left: 2px solid var(--accent); background: var(--accent-soft);
  border-radius: 0 8px 8px 0; font-size: 14px; min-height: 52px;
}
.diagram-info b { font-family: var(--mono); font-size: 13px; color: var(--accent); margin-right: 6px; }

.adr { display: grid; gap: 16px; }
.adr-item { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
.adr-item h3 { margin-bottom: 14px; display: flex; gap: 12px; align-items: baseline; }
.adr-item h3 .n { font: 500 12px var(--mono); color: var(--accent); }
.adr-grid { display: grid; grid-template-columns: 110px 1fr; gap: 8px 18px; font-size: 15px; }
.adr-grid dt { font: 500 11px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .07em; padding-top: 4px; }
.adr-grid dd { margin: 0; }
@media (max-width: 600px) { .adr-grid { grid-template-columns: 1fr; gap: 2px; } .adr-grid dd { margin-bottom: 10px; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  /* The caret keeps blinking and the stack grid keeps cycling with its fade (chosen design):
     it is a slow colour change in place, not movement across the screen. */
  .diagram .flow { display: none; }
  .btn, .card { transition: none; }
}