:root {
  --paper:   #f6f7f9;
  --panel:   #ffffff;
  --ink:     #0d1522;
  --muted:   #69727f;
  --rule:    #e4e8ed;
  --signal:  #00a878;
  --signal-soft: rgba(0, 168, 120, 0.12);
  --mark:    #e2a03f;
  --maxw:    52rem;

  --display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --body:    "Inter", ui-sans-serif, system-ui, sans-serif;
  --mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:  #0b111b;
    --panel:  #121a26;
    --ink:    #eef1f5;
    --muted:  #8b95a3;
    --rule:   #20293a;
    --signal: #2dd4a0;
    --signal-soft: rgba(45, 212, 160, 0.14);
    --mark:   #f0b860;
  }
}

* { box-sizing: border-box; }

html { font-size: 18px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 5rem) 1.5rem 4rem;
}

a {
  color: var(--signal);
  text-decoration: none;
  text-underline-offset: 3px;
}
a:hover { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 2px;
}

p { margin: 0 0 0.5rem; }

/* ---------- Hero ---------- */

.hero {
  margin-bottom: clamp(3rem, 7vw, 4.5rem);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1rem;
}
.eyebrow .up { color: var(--signal); font-weight: 500; }

h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.6rem, 8vw, 4rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
}

.tagline {
  font-size: 1.05rem;
  color: var(--muted);
  margin: 0 0 1.5rem;
  max-width: 32ch;
}

.links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding: 0;
  margin: 0;
  font-family: var(--mono);
  font-size: 0.82rem;
}
.links a { color: var(--ink); }
.links a::before { content: "→ "; color: var(--signal); }
.links a:hover { color: var(--signal); }

/* ---------- Sections ---------- */

section { margin-bottom: 2.75rem; }

h2 {
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin: 0 0 1.1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

/* ---------- Experience timeline ---------- */

.timeline { list-style: none; padding: 0; margin: 0; }
.timeline > li {
  margin-bottom: 1.9rem;
  padding-left: 1.1rem;
  border-left: 2px solid var(--rule);
  position: relative;
}
.timeline > li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.55rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--signal);
}

.org {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.08rem;
  margin-bottom: 0.15rem;
}

.role {
  font-weight: 500;
  color: var(--ink);
  margin: 0 0 0.35rem;
}

.when {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 0.74rem;
  color: var(--muted);
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.roles {
  list-style: none;
  padding: 0;
  margin: 0.3rem 0 0.55rem;
}
.roles > li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}
.roles .role { font-weight: 400; color: var(--muted); margin: 0; }
.roles > li:first-child .role { color: var(--ink); font-weight: 500; }

.timeline p:last-child { margin: 0; color: var(--muted); }

/* ---------- Projects ---------- */

.projects { list-style: none; padding: 0; margin: 0; }
.projects > li {
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--rule);
}
.projects > li:first-child { padding-top: 0; }
.projects > li:last-child { border-bottom: 0; }

.proj-name {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.05rem;
}
a.proj-name { color: var(--ink); }
a.proj-name:hover { color: var(--signal); }

.proj-tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--signal);
  margin-left: 0.7rem;
  letter-spacing: 0.02em;
}

.projects p { margin: 0.3rem 0 0; color: var(--muted); }

/* ---------- Skills ---------- */

.skills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
}
.skills li {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: 0.3rem 0.6rem;
}

/* ---------- Footer ---------- */

footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
footer p {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin: 0;
}

/* ---------- Sub-pages ---------- */

.crumbs {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  margin-bottom: clamp(2rem, 5vw, 3rem);
}

.proj-hero { margin-bottom: clamp(2.5rem, 6vw, 3.5rem); }
.proj-hero h1 { font-size: clamp(2.1rem, 6vw, 3rem); }
.proj-hero .tagline { max-width: 52ch; }
.proj-hero .skills { margin-top: 1.25rem; }

.more {
  font-family: var(--mono);
  font-size: 0.78rem;
  margin: 1.1rem 0 0;
}

/* ---------- Portfolio cards ---------- */

.card-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 1rem;
}

.card {
  display: block;
  height: 100%;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1.1rem 1.2rem;
  color: var(--ink);
  transition: border-color 0.15s ease;
}
.card:hover {
  border-color: var(--signal);
  text-decoration: none;
}
.card .proj-tag { display: block; margin: 0.15rem 0 0.4rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.card .ext {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
}

/* ---------- Responsive ---------- */