:root {
  --bg: #14171d;
  --bg-alt: #191d24;
  --surface: #1d222a;
  --surface-hover: #242a34;
  --border: #2c323c;
  --text: #e9ebee;
  --text-dim: #a3a9b3;
  --text-dimmer: #6f7580;
  --accent: #e8a33d;
  --accent-strong: #f2b955;
  --accent-soft: rgba(232, 163, 61, 0.14);
  --ok: #6fbf8b;
  --radius: 10px;
  --max-width: 920px;
  --font-display: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-body: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f6f5f2;
    --bg-alt: #ffffff;
    --surface: #ffffff;
    --surface-hover: #efede8;
    --border: #ddd9d0;
    --text: #22252b;
    --text-dim: #4f545d;
    --text-dimmer: #7b8089;
    --accent: #b1650f;
    --accent-strong: #8f5109;
    --accent-soft: rgba(177, 101, 15, 0.1);
    --ok: #2f7d52;
  }
}

:root[data-theme="dark"] {
  --bg: #14171d;
  --bg-alt: #191d24;
  --surface: #1d222a;
  --surface-hover: #242a34;
  --border: #2c323c;
  --text: #e9ebee;
  --text-dim: #a3a9b3;
  --text-dimmer: #6f7580;
  --accent: #e8a33d;
  --accent-strong: #f2b955;
  --accent-soft: rgba(232, 163, 61, 0.14);
  --ok: #6fbf8b;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(circle at 15% 10%, var(--accent-soft), transparent 40%),
    radial-gradient(circle at 85% 30%, var(--accent-soft), transparent 35%);
  pointer-events: none;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.brand .dot {
  color: var(--accent);
  animation: blink 1.4s steps(1) infinite;
}
@media (prefers-reduced-motion: reduce) {
  .brand .dot { animation: none; }
}
@keyframes blink {
  0%, 45% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s ease;
}
.nav a:hover { color: var(--text); }
.nav-cta {
  color: var(--accent) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 34px;
  height: 34px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 16px;
  margin: 0 auto;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Hero */
.hero {
  padding: 96px 24px 72px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 56px;
  align-items: center;
}
.hero-copy { min-width: 0; }
.profile-portrait {
  margin: 0;
  justify-self: end;
  width: 240px;
}
.profile-portrait img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}
.portrait-fallback {
  display: none;
  aspect-ratio: 1;
  place-items: center;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 700;
}
.profile-portrait figcaption {
  margin-top: 14px;
  color: var(--text-dimmer);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.5;
  text-transform: uppercase;
}
.hero--simple { display: block; }
.hero.hero--simple h1 { max-width: 24ch; }
.eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin: 0 0 18px;
}
.hero-copy .eyebrow::before { content: "$ whoami "; color: var(--text-dimmer); }
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 1.15;
  margin: 0 0 24px;
  font-weight: 700;
  max-width: 15ch;
}
.hero h1 span {
  color: var(--accent);
  font-size: 0.58em;
  line-height: 1.25;
}
.hero-sub {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 62ch;
  margin: 0 0 36px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 11px 20px;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  border: 1px solid transparent;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  color: #05201c;
}
.btn-primary:hover { background: var(--accent-strong); }
.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--text-dimmer);
  font-size: 0.88rem;
}

/* Sections */
.section {
  padding: 64px 24px;
  border-top: 1px solid var(--border);
}
.section-title {
  margin: 0 0 36px;
}
.section-title span {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

/* About */
.about-grid { display: grid; gap: 20px; }
.about-text {
  color: var(--text-dim);
  max-width: 72ch;
  margin: 0;
}
.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  margin-top: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.stat { display: flex; flex-direction: column; }
.stat strong {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  color: var(--accent);
}
.stat span {
  color: var(--text-dimmer);
  font-size: 0.85rem;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.skill-card:hover {
  border-color: var(--accent);
  background: var(--surface-hover);
}
.skill-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin: 0 0 10px;
}
.skill-card p {
  color: var(--text-dim);
  font-size: 0.88rem;
  margin: 0;
  line-height: 1.55;
}

/* Timeline */
.timeline {
  display: grid;
  gap: 40px;
  position: relative;
}
.tl-item {
  display: grid;
  grid-template-columns: 16px 1fr;
  gap: 20px;
}
.tl-marker {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 8px;
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.tl-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}
.tl-head h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0;
}
.tl-head h3 span {
  color: var(--text-dimmer);
  font-weight: 400;
  font-size: 0.9rem;
}
.tl-date {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 500;
  white-space: nowrap;
}
.tl-company {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin: 4px 0 12px;
}
.tl-content ul {
  margin: 0;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 0.92rem;
}
.tl-content li { margin-bottom: 8px; }
.tl-content li:last-child { margin-bottom: 0; }

/* Highlights */
.highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.highlight-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.highlight-card h3 {
  font-family: var(--font-display);
  font-size: 1.02rem;
  margin: 0 0 10px;
  color: var(--accent);
}
.section-cta {
  margin: 24px 0 0;
}
.section-cta a {
  font-family: var(--font-mono);
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}
.section-cta a:hover {
  border-bottom-color: var(--accent);
}

.highlight-card p {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin: 0;
}

/* Architecture page */
.architecture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.architecture-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.architecture-card h3 {
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 1.02rem;
  margin: 0 0 10px;
}
.architecture-card p,
.decision-list {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin: 0;
}
.decision-list {
  padding-left: 20px;
}
.decision-list li { margin-bottom: 10px; }
.decision-list li:last-child { margin-bottom: 0; }
.flow {
  display: flex;
  align-items: stretch;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 2px 12px;
}
.flow-node {
  flex: 1 0 145px;
  min-height: 78px;
  display: grid;
  place-items: center;
  padding: 12px;
  text-align: center;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.flow-arrow {
  align-self: center;
  flex-shrink: 0;
  white-space: nowrap;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 1.2rem;
}

/* Credentials */
.cred-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.cred-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.cred-card h3 {
  font-size: 0.95rem;
  margin: 0 0 6px;
  font-family: var(--font-display);
}
.cred-card p {
  color: var(--text-dimmer);
  font-size: 0.85rem;
  margin: 0;
}

/* Contact */
.contact-section { text-align: left; }
.contact-lead {
  color: var(--text-dim);
  max-width: 60ch;
  margin: 0 0 28px;
}
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.contact-link {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  padding: 12px 18px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.contact-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px 48px;
}
.site-footer p {
  color: var(--text-dimmer);
  font-size: 0.82rem;
  margin: 0;
}
.footer-link {
  color: var(--text-dimmer);
}
.footer-link:hover { color: var(--accent); }

/* Lab pages */
.step-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  margin: 20px 0 8px;
}
.step-label:first-of-type { margin-top: 0; }
pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 0 0 4px;
}
:not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--text);
}
pre code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text);
  line-height: 1.6;
  white-space: pre;
}
.lab-list {
  margin: 0;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 0.92rem;
}
.lab-list li { margin-bottom: 8px; }
.lab-list li:last-child { margin-bottom: 0; }

/* Project tags */
.tag-row {
  margin: 14px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-dim);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 10px;
}

/* Reveal animation (only when JS is running, so content stays visible without it) */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Mobile */
@media (max-width: 720px) {
  .nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 16px;
    transform: translateY(-130%);
    visibility: hidden;
    transition: transform 0.2s ease, visibility 0s linear 0.2s;
  }
  .nav.is-open {
    transform: translateY(0);
    visibility: visible;
    transition: transform 0.2s ease;
  }
  .nav a {
    padding: 12px 0;
    width: 100%;
    border-bottom: 1px solid var(--border);
  }
  .nav a:last-child { border-bottom: none; }
  .nav-toggle { display: flex; }
  .hero {
    padding-top: 56px;
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .profile-portrait {
    justify-self: start;
    width: min(100%, 220px);
  }
  .flow { align-items: stretch; }
}