/* ============ Tokens ============ */
:root {
  --bg: #070b12;
  --surface: #0c1320;
  --surface-2: #101a2b;
  --border: rgba(148, 163, 184, 0.14);
  --text: #e6edf7;
  --muted: #93a4bf;
  --accent-1: #67e8f9;
  --accent-2: #a78bfa;
  --accent-3: #f472b6;
  --gradient: linear-gradient(120deg, var(--accent-1), var(--accent-2) 55%, var(--accent-3));
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --radius: 14px;
  --max-width: 1120px;
  --nav-h: 64px;
}

/* ============ Base ============ */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--accent-1); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
::selection { background: rgba(167, 139, 250, 0.35); }

/* ============ Layered backdrop ============ */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -3;
  background-image: radial-gradient(rgba(148, 163, 184, 0.12) 1px, transparent 1px);
  background-size: 30px 30px;
  -webkit-mask-image: radial-gradient(ellipse 90% 65% at 50% 0%, black 25%, transparent 100%);
  mask-image: radial-gradient(ellipse 90% 65% at 50% 0%, black 25%, transparent 100%);
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.aurora {
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
}
.aurora--a {
  width: 640px;
  height: 640px;
  top: -180px;
  left: -160px;
  opacity: 0.32;
  background: radial-gradient(circle, rgba(103, 232, 249, 0.55), transparent 70%);
  animation: drift-a 22s ease-in-out infinite alternate;
}
.aurora--b {
  width: 560px;
  height: 560px;
  bottom: -200px;
  right: -140px;
  opacity: 0.28;
  background: radial-gradient(circle, rgba(167, 139, 250, 0.5), transparent 70%);
  animation: drift-b 28s ease-in-out infinite alternate;
}
@keyframes drift-a { to { transform: translate(120px, 90px) scale(1.15); } }
@keyframes drift-b { to { transform: translate(-100px, -70px) scale(1.1); } }

/* ============ Accessibility ============ */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--accent-1);
  color: #04121a;
  padding: 0.5rem 1rem;
  font-weight: 600;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
  background: rgba(7, 11, 18, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand-dot { color: var(--accent-1); }
.site-nav { display: flex; gap: 1.75rem; }
.nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  position: relative;
}
.nav-link:hover { color: var(--text); text-decoration: none; }
.nav-link.active { color: var(--accent-1); }
.nav-link.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  background: var(--gradient);
  border-radius: 2px;
}

/* ============ Layout containers ============ */
.wrap { max-width: var(--max-width); margin: 0 auto; padding: 0 clamp(1.25rem, 4vw, 2.5rem); }
.section { padding-block: 4.5rem; }

/* ============ Hero ============ */
.hero {
  min-height: calc(100svh - var(--nav-h));
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.5rem;
  padding-block: 3rem;
  position: relative;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.6);
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.55); }
  70% { box-shadow: 0 0 0 9px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3rem, 8vw, 6.25rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: 0;
}
.hero-title .outline {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--text);
}
.hero-title .accent {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-tagline {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  color: var(--accent-1);
  margin: 0;
}
.hero-desc { max-width: 54ch; color: var(--muted); font-size: 1.05rem; margin: 0; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 0.5rem; }

/* ============ Buttons ============ */
.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.7rem 1.3rem;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn--primary {
  background: var(--gradient);
  color: #04121a;
  font-weight: 600;
}
.btn--primary:hover { box-shadow: 0 8px 28px -8px rgba(103, 232, 249, 0.55); }
.btn--ghost { border-color: var(--border); color: var(--text); background: rgba(255, 255, 255, 0.03); }
.btn--ghost:hover { border-color: rgba(103, 232, 249, 0.5); box-shadow: 0 8px 24px -10px rgba(103, 232, 249, 0.35); }

/* ============ Marquee ============ */
.marquee {
  overflow: hidden;
  border-block: 1px solid var(--border);
  padding-block: 0.85rem;
  background: rgba(12, 19, 32, 0.5);
}
.marquee-track {
  display: flex;
  gap: 3.25rem;
  width: max-content;
  animation: marquee 36s linear infinite;
}
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-track span {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}
.marquee-track span::before { content: '◆ '; color: var(--accent-2); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ============ Section heads ============ */
.section-head { display: flex; align-items: baseline; gap: 1rem; margin-bottom: 2.25rem; }
.section-index { font-family: var(--font-mono); color: var(--accent-1); font-size: 0.9rem; }
.section-title { font-family: var(--font-display); font-size: clamp(1.5rem, 3vw, 2.2rem); margin: 0; }
.section-link { font-family: var(--font-mono); font-size: 0.8rem; margin-left: auto; }

/* ============ Grids ============ */
.grid { display: grid; gap: 1.25rem; }
.grid--projects { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.grid--posts { grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); }

/* ============ Cards ============ */
.card {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.012));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  color: var(--text);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(103, 232, 249, 0.45);
  box-shadow: 0 14px 44px -14px rgba(103, 232, 249, 0.28);
  text-decoration: none;
}
.card-thumb-wrap { border-radius: calc(var(--radius) - 6px); overflow: hidden; }
.card-thumb { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; transition: transform 0.4s ease; }
.card:hover .card-thumb { transform: scale(1.05); }
.card-thumb--empty {
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--surface-2), var(--bg));
  border: 1px dashed var(--border);
  border-radius: calc(var(--radius) - 6px);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.card-body { display: flex; flex-direction: column; gap: 0.55rem; flex: 1; }
.card-title { font-family: var(--font-display); font-size: 1.15rem; margin: 0; line-height: 1.3; }
.card-desc {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============ Chips & tags ============ */
.chip-row { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: auto; }
.chip {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  letter-spacing: 0.03em;
}
.tag--featured {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #04121a;
  background: var(--gradient);
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
}
.post-meta { display: flex; align-items: center; gap: 0.7rem; }
.post-date { font-family: var(--font-mono); font-size: 0.75rem; color: var(--muted); }

/* ============ Projects page tools ============ */
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; margin-bottom: 2rem; }
.search-box {
  flex: 1 1 260px;
  max-width: 420px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.65rem 1.1rem;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.search-box:focus { border-color: rgba(103, 232, 249, 0.6); box-shadow: 0 0 0 3px rgba(103, 232, 249, 0.15); }
.tag-bar { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.tag-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.tag-btn:hover { color: var(--text); border-color: rgba(103, 232, 249, 0.4); }
.tag-btn.active { color: #04121a; background: var(--gradient); border-color: transparent; }
.page-intro { max-width: 60ch; color: var(--muted); margin: 0 0 2rem; }
.empty-state { color: var(--muted); font-family: var(--font-mono); padding: 3rem 0; text-align: center; }

/* ============ Detail pages ============ */
.back-link { font-family: var(--font-mono); font-size: 0.8rem; color: var(--muted); }
.detail-hero { padding-block: 3rem 2rem; }
.detail-title { font-family: var(--font-display); font-size: clamp(2rem, 5vw, 3.4rem); line-height: 1.05; letter-spacing: -0.02em; margin: 1rem 0 0.75rem; }
.detail-desc { max-width: 62ch; color: var(--muted); font-size: 1.05rem; margin: 0 0 1.5rem; }
.detail-meta { display: flex; flex-wrap: wrap; gap: 1.75rem; margin-block: 1.5rem; }
.meta-item { display: flex; flex-direction: column; gap: 0.2rem; }
.meta-label { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.meta-value { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text); }
.link-row { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-block: 1.5rem; }
.detail-thumb { width: 100%; max-width: 860px; border-radius: var(--radius); border: 1px solid var(--border); margin-block: 1rem; display: block; }

/* ============ Article (blog post) ============ */
.article { max-width: 760px; margin: 0 auto; padding-bottom: 4rem; }
.article-header { padding-block: 3rem 1.5rem; }
.article-title { font-family: var(--font-display); font-size: clamp(1.9rem, 4.5vw, 3rem); line-height: 1.1; letter-spacing: -0.02em; margin: 0.75rem 0; }
.article-meta { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; color: var(--muted); font-family: var(--font-mono); font-size: 0.8rem; }
.article-body { font-size: 1.04rem; }
.article-body h1, .article-body h2, .article-body h3 { font-family: var(--font-display); letter-spacing: -0.01em; margin-top: 2.2em; }
.article-body h2 { font-size: 1.65rem; }
.article-body a { text-decoration: underline; text-underline-offset: 3px; }
.article-body img { max-width: 100%; border-radius: var(--radius); border: 1px solid var(--border); }
.article-body code { font-family: var(--font-mono); font-size: 0.88em; background: rgba(148, 163, 184, 0.14); padding: 0.15em 0.4em; border-radius: 6px; }
.article-body pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  overflow-x: auto;
}
.article-body pre code { background: none; padding: 0; }
.article-body blockquote {
  margin: 1.5rem 0;
  padding: 0.2rem 1.2rem;
  border-left: 3px solid var(--accent-2);
  color: var(--muted);
  font-style: italic;
}
.article-body table { border-collapse: collapse; width: 100%; margin-block: 1.5rem; font-size: 0.92rem; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: 0.5rem 0.75rem; text-align: left; }
.article-body th { background: var(--surface); font-family: var(--font-mono); font-size: 0.8rem; }

/* ============ 404 ============ */
.not-found { min-height: 60svh; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1.25rem; text-align: center; padding-block: 4rem; }
.not-found-code {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(5rem, 18vw, 11rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px var(--text);
  margin: 0;
}
.not-found-title { font-family: var(--font-display); font-size: 1.6rem; margin: 0; }
.not-found-desc { color: var(--muted); max-width: 44ch; margin: 0; }

/* ============ Footer ============ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.25rem clamp(1.25rem, 4vw, 2.5rem);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}
.footer-note { color: var(--muted); font-size: 0.85rem; margin: 0; }
.footer-social { display: flex; gap: 1.25rem; }
.social-link { font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted); }
.social-link:hover { color: var(--accent-1); }

/* ============ Responsive ============ */
@media (max-width: 720px) {
  .site-nav { gap: 1.1rem; }
  .section { padding-block: 3rem; }
  .grid--projects, .grid--posts { grid-template-columns: 1fr; }
  .site-footer { flex-direction: column; align-items: flex-start; }
}

/* ============ Reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .aurora, .marquee-track, .status-dot { animation: none !important; }
  .card, .btn, .card-thumb { transition: none; }
}