/* ── TOKENS ─────────────────────────────────────────────── */
:root {
  --bg:        #080C10;
  --bg-card:   #0F1620;
  --bg-surface:#152030;
  --fg:        #DDD8CC;
  --fg-muted:  #8C9CA6;
  --fg-dim:    #3A4A56;
  --accent:    #4A9EBF;
  --accent-dim:#1E4A5C;
  --border:    #1C2C3A;
  --border-hi: #2A4050;
  --rule:      #1A2A36;

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Courier New', monospace;
  --font-body:    'Inter', system-ui, sans-serif;

  --sz-xs:  0.688rem;
  --sz-sm:  0.813rem;
  --sz-base:0.9375rem;
  --sz-md:  1.0625rem;
  --sz-lg:  1.375rem;
  --sz-xl:  1.875rem;
  --sz-2xl: 2.5rem;
  --sz-3xl: 3.5rem;
}

/* ── THEMES (easter egg: click the hero name to cycle) ───── */
/* light · burgundy */
[data-theme="light-burgundy"] {
  --bg:        #F4F1EC;
  --bg-card:   #FBF9F5;
  --bg-surface:#ECE6DC;
  --fg:        #1C1814;
  --fg-muted:  #6A6157;
  --fg-dim:    #B5AB9D;
  --accent:    #8C2F39;
  --accent-dim:#E0C4C8;
  --border:    #DED6CA;
  --border-hi: #CABFAF;
  --rule:      #E3DCD1;
}
/* light · neon green */
[data-theme="light-neon"] {
  --bg:        #F4F6F3;
  --bg-card:   #FBFCFA;
  --bg-surface:#E8ECE5;
  --fg:        #15201A;
  --fg-muted:  #5C6A60;
  --fg-dim:    #AEB8AE;
  --accent:    #0E9F3C;
  --accent-dim:#C3E8CE;
  --border:    #DBE0D8;
  --border-hi: #C6CCC1;
  --rule:      #E0E4DC;
}
/* oled black · gold */
[data-theme="oled-gold"] {
  --bg:        #000000;
  --bg-card:   #0A0A09;
  --bg-surface:#16140F;
  --fg:        #EDE8DB;
  --fg-muted:  #9A9281;
  --fg-dim:    #4A4534;
  --accent:    #E3B341;
  --accent-dim:#5C4A1E;
  --border:    #1E1D17;
  --border-hi: #2F2D22;
  --rule:      #1A1913;
}

/* ── RESET ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--sz-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
p { text-align: justify; text-justify: inter-word; hyphens: auto; }

/* ── UTILITY ────────────────────────────────────────────── */
.mono  { font-family: var(--font-mono); }
.muted { color: var(--fg-muted); }
.accent { color: var(--accent); }
.label {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.rule-h {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 0;
}

/* ── LAYOUT ─────────────────────────────────────────────── */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 2rem;
}
.section {
  padding: 5rem 0;
  border-top: 1px solid var(--rule);
}
.section-header {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--sz-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* ── NAV ─────────────────────────────────────────────────── */
nav.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: var(--sz-sm);
  color: var(--accent);
  letter-spacing: 0.06em;
}
.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
  position: relative;
  padding-bottom: 2px;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width 80ms linear;
}
.nav-links a:hover { color: var(--fg); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--accent); }

/* ── HERO ─────────────────────────────────────────────────── */
#hero {
  padding-top: 52px;
  min-height: 78vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.hero-inner {
  padding: 4rem 2rem 0;
  max-width: 1080px;
  margin: 0 auto;
  width: 100%;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}
.hero-name {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, var(--sz-3xl));
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.0;
  color: var(--fg);
  margin-bottom: 1.5rem;
}
.hero-descriptor {
  font-family: var(--font-body);
  font-size: var(--sz-base);
  color: var(--fg-muted);
  max-width: 520px;
  line-height: 1.8;
  margin-bottom: 3rem;
  hyphens: auto;
}
.hero-descriptor em {
  font-style: normal;
  color: var(--fg);
}

/* ── TITLE BLOCK (engineering drawing signature element) ─── */
.title-block {
  border: 1px solid var(--border-hi);
  margin-top: 4rem;
  display: grid;
  grid-template-columns: 1fr 1fr 1.5fr;
}
.tb-cell {
  padding: 0.6rem 1rem;
  border-right: 1px solid var(--border-hi);
}
.tb-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
  display: block;
  margin-bottom: 0.15rem;
}
.tb-value {
  font-family: var(--font-mono);
  font-size: var(--sz-sm);
  color: var(--fg);
}
.tb-value.hi {
  color: var(--accent);
  font-weight: 500;
}
.tb-col {
  display: grid;
  grid-template-rows: 1fr 1fr;
  border-right: 1px solid var(--border-hi);
}
.tb-col:last-child { border-right: none; }
.tb-col .tb-cell {
  border-right: none;
  border-bottom: 1px solid var(--border-hi);
}
.tb-col .tb-cell:last-child { border-bottom: none; }

/* ── ABOUT ────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 3rem;
}
.about-body {
  font-size: var(--sz-base);
  color: var(--fg-muted);
  line-height: 1.8;
}
.about-body p {
  text-align: justify;
  hyphens: auto;
}
.about-body p + p { margin-top: 1rem; }
.about-body strong { color: var(--fg); font-weight: 500; }
.credentials-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.credential-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg-card);
}
.credential-item:hover { border-color: var(--border-hi); }
.cred-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
}
.cred-name {
  font-size: var(--sz-sm);
  color: var(--fg);
}
.cred-issuer {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  color: var(--fg-muted);
  margin-left: auto;
}

/* ── SKILLS ───────────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--border);
}
.skill-domain {
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem;
}
.skill-domain:nth-child(3n) { border-right: none; }
.skill-domain:nth-last-child(-n+3) { border-bottom: none; }
.skill-domain-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: block;
}
.skill-items {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.skill-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.skill-name {
  font-size: var(--sz-sm);
  color: var(--fg-muted);
}
.skill-dots {
  display: flex;
  gap: 3px;
}
.dot {
  width: 5px; height: 5px;
  border: 1px solid var(--fg-dim);
  border-radius: 0;
}
.dot.filled { background: var(--accent); border-color: var(--accent); }

/* ── PROJECTS ─────────────────────────────────────────────── */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
}
.project-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 2rem;
  padding: 2rem;
  border-bottom: 1px solid var(--border);
  transition: background 80ms linear;
}
.project-item:last-child { border-bottom: none; }
.project-item:hover { background: var(--bg-card); }
.project-index {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  color: var(--fg-dim);
  padding-top: 0.2rem;
  width: 2rem;
}
.project-content { flex: 1; }
.project-title {
  font-family: var(--font-display);
  font-size: var(--sz-lg);
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}
.project-title a:hover { color: var(--accent); }
.project-desc {
  font-size: var(--sz-sm);
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 560px;
  margin-bottom: 0.75rem;
}
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--border-hi);
  color: var(--fg-muted);
  text-transform: uppercase;
}
.project-meta {
  text-align: right;
}
.project-year {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  color: var(--fg-dim);
}
.project-status {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 0.25rem;
}

/* ── BLOG ─────────────────────────────────────────────────── */
.blog-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.post-card {
  background: var(--bg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: background 80ms linear;
}
.post-card:hover { background: var(--bg-card); }
.post-date {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  color: var(--fg-dim);
}
.post-title {
  font-family: var(--font-display);
  font-size: var(--sz-md);
  font-weight: 600;
  color: var(--fg);
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.post-title a:hover { color: var(--accent); }
.post-excerpt {
  font-size: var(--sz-sm);
  color: var(--fg-muted);
  line-height: 1.7;
  flex: 1;
}
.post-tag {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ── CONTACT ──────────────────────────────────────────────── */
.contact-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: stretch;
  gap: 4rem;
}
.contact-heading {
  font-family: var(--font-display);
  font-size: var(--sz-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--fg);
  margin-bottom: 1rem;
}
.contact-sub {
  font-size: var(--sz-base);
  color: var(--fg-muted);
  max-width: 420px;
  line-height: 1.7;
}
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: flex-end;
}
.contact-link {
  font-family: var(--font-mono);
  font-size: var(--sz-sm);
  color: var(--fg-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.contact-link:hover { color: var(--accent); }
.contact-link-label {
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.cta-btn {
  display: inline-block;
  margin-top: 2rem;
  padding: 0.8rem 1.75rem;
  border: 1px solid var(--accent);
  font-family: var(--font-mono);
  font-size: var(--sz-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: transparent;
  cursor: pointer;
  transition: background 80ms linear, color 80ms linear;
}
.cta-btn:hover { background: var(--accent); color: var(--bg); }

/* ── FOOTER ───────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--rule);
  padding: 2rem;
}
.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-copy {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  color: var(--fg-dim);
}
.footer-loc {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  color: var(--fg-dim);
}

/* ── SINGLE POST / PROJECT PAGE ───────────────────────────── */
.single-header {
  padding-top: 52px;
}
.single-meta {
  max-width: 720px;
  margin: 0 auto;
  padding: 4rem 2rem 0;
}
.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 2rem;
  display: block;
}
.breadcrumb a:hover { color: var(--accent); }
.single-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, var(--sz-2xl));
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--fg);
  margin-bottom: 1rem;
}
.single-subline {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}
.single-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 2rem 5rem;
  font-size: var(--sz-md);
  line-height: 1.85;
  color: var(--fg-muted);
}
.single-content h2 {
  font-family: var(--font-display);
  font-size: var(--sz-lg);
  color: var(--fg);
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.01em;
}
.single-content h3 {
  font-family: var(--font-display);
  font-size: var(--sz-md);
  color: var(--fg);
  margin: 2rem 0 0.75rem;
}
.single-content p { margin-bottom: 1.25rem; }
.single-content a { color: var(--accent); border-bottom: 1px solid var(--accent-dim); }
.single-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-card);
  padding: 0.15em 0.4em;
  border: 1px solid var(--border);
}
.single-content pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.25rem;
}
.single-content pre code { border: none; padding: 0; background: none; }
.single-content blockquote {
  border-left: 2px solid var(--accent);
  padding-left: 1.25rem;
  color: var(--fg-muted);
  font-style: italic;
  margin: 1.5rem 0;
}
.single-content ul, .single-content ol {
  margin: 0 0 1.25rem 1.25rem;
}
.single-content img {
  border: 1px solid var(--border);
  margin: 1.5rem 0;
}

/* ── PHOTO GALLERY ────────────────────────────────────────── */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.photo-item {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  cursor: pointer;
}
.photo-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 450ms cubic-bezier(0.2, 0.6, 0.2, 1);
}
/* engineering registration tick (top-left) on hover */
.photo-item::before {
  content: "";
  position: absolute;
  top: 9px; left: 9px;
  width: 11px; height: 11px;
  border-top: 1px solid var(--accent);
  border-left: 1px solid var(--accent);
  opacity: 0;
  transition: opacity 180ms ease;
  z-index: 2;
}
/* caption gradient + label on hover */
.photo-item::after {
  content: "[ VIEW ]";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 2.5rem 0.9rem 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--sz-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg);
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 180ms ease, transform 180ms ease;
  pointer-events: none;
}
.photo-item:hover {
  border-color: var(--accent);
}
.photo-item:hover img { transform: scale(1.06); }
.photo-item:hover::before,
.photo-item:hover::after { opacity: 1; }
.photo-item:hover::after { transform: translateY(0); }

/* lightbox overlay */
.lb-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(0, 0, 0, 0.9);
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
  padding: 5vh 5vw;
}
.lb-overlay.open { display: flex; animation: lb-fade 200ms ease; }
@keyframes lb-fade { from { opacity: 0; } to { opacity: 1; } }
.lb-overlay img {
  max-width: 92vw;
  max-height: 92vh;
  object-fit: contain;
  border: 1px solid var(--border-hi);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.6);
}
.lb-close {
  position: fixed;
  top: 1.25rem;
  right: 1.5rem;
  font-family: var(--font-mono);
  font-size: var(--sz-sm);
  color: var(--fg-muted);
  cursor: pointer;
  letter-spacing: 0.08em;
  z-index: 1000;
}
.lb-close:hover { color: var(--accent); }

@media (max-width: 768px) {
  .photo-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
}
@media (max-width: 480px) {
  .photo-grid { grid-template-columns: 1fr; }
}

/* ── INDEX LIST PAGES (all projects / all posts) ──────────── */
.list-page-header {
  padding-top: 52px;
}
.list-page-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 4rem 2rem 0;
}
.list-page-title {
  font-family: var(--font-display);
  font-size: var(--sz-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 3rem;
}

/* ── RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .container { padding: 0 1.25rem; }
  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
  .skill-domain:nth-child(3n) { border-right: 1px solid var(--border); }
  .skill-domain:nth-child(2n) { border-right: none; }
  .blog-grid { grid-template-columns: 1fr; }
  .contact-inner { grid-template-columns: 1fr; gap: 2rem; }
  .contact-links { align-items: flex-start; }
  .title-block { grid-template-columns: 1fr 1fr; }
  .project-item { grid-template-columns: auto 1fr; }
  .project-meta { display: none; }
  .nav-links { gap: 1.25rem; }
  .hero-name { font-size: 2.5rem; }
}

@media (max-width: 480px) {
  .skills-grid { grid-template-columns: 1fr; }
  .skill-domain { border-right: none !important; }
  .nav-links { gap: 0.875rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}