*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f7f7f8;
  --bg2: #ededf1;
  --fg: #0f0f12;
  --muted: #5a5a6e;
  --faint: #66667a;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-dim: rgba(37,99,235,0.08);
  --border: rgba(15,15,18,0.08);
  --nav-bg: rgba(247,247,248,0.88);
  --card-b-bg: #ffffff;
  --mono: 'JetBrains Mono', monospace;
  --sans: 'Space Grotesk', sans-serif;
  --gh-font-heading: var(--sans);
  --gh-font-body: var(--sans);
}

/* DARK MODE */
:root.dark {
  --bg: #0c0c0f;
  --bg2: #141418;
  --fg: #e8e8f0;
  --muted: #8888a0;
  --faint: #8a8aa0;
  --accent: #3b82f6;
  --accent-strong: #60a5fa;
  --accent-dim: rgba(59,130,246,0.1);
  --border: rgba(255,255,255,0.07);
  --nav-bg: rgba(12,12,15,0.88);
  --card-b-bg: #16161c;
}

html { scroll-behavior: smooth; }
html, body { transition: background 0.35s ease, color 0.35s ease; }

body {
  font-family: var(--gh-font-body);
  background: var(--bg);
  color: var(--fg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* dot-grid bg */
body::before {
  content: '';
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image: radial-gradient(circle, rgba(37,99,235,0.12) 1px, transparent 1px);
  background-size: 28px 28px;
  transition: opacity 0.35s ease;
}
:root.dark body::before {
  background-image: radial-gradient(circle, rgba(59,130,246,0.18) 1px, transparent 1px);
}
#root,
.site-shell { position: relative; z-index: 1; }

::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 2px; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 10000;
  padding: 10px 14px;
  background: var(--accent);
  color: #fff;
  font-family: var(--mono);
  font-size: 12px;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}
.skip-link:focus {
  transform: translateY(0);
}

a:focus-visible,
button:focus-visible,
.site-shell:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

/* NAV */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 48px; height: 58px;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background 0.35s ease;
}
.nav-logo {
  font-family: var(--mono); font-size: 14px; font-weight: 500;
  letter-spacing: 0.04em; color: var(--fg); cursor: pointer;
  text-decoration: none;
}
.nav-logo em { color: var(--accent); font-style: normal; }
.nav-right { display: flex; align-items: center; gap: 4px; }
.nav-btn {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--muted);
  background: none; border: none; cursor: pointer;
  padding: 6px 14px; border-radius: 4px;
  text-decoration: none;
  transition: color 0.18s, background 0.18s;
}
.nav-btn:hover { color: var(--fg); background: var(--bg2); }
.nav-btn.active { color: var(--accent-strong); background: var(--accent-dim); }

/* Dark mode toggle */
.dark-toggle {
  width: 36px; height: 20px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  margin-left: 12px;
  transition: background 0.3s;
  flex-shrink: 0;
}
.dark-toggle::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--muted);
  transition: transform 0.28s cubic-bezier(0.4,0,0.2,1), background 0.28s;
}
:root.dark .dark-toggle { background: rgba(59,130,246,0.2); }
:root.dark .dark-toggle::after { transform: translateX(16px); background: var(--accent); }

/* PAGE */
.page { display: none; min-height: 100vh; padding-top: 58px; }
.page.active {
  display: block;
  animation: pageIn 0.4s cubic-bezier(0.2,1,0.4,1) both;
}
@keyframes pageIn {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.55s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ── HERO ── */
.hero {
  min-height: calc(100vh - 58px);
  display: flex; flex-direction: column; justify-content: center;
  padding: 80px 48px 60px;
  position: relative; overflow: hidden;
}

/* static grid */
.hero-grid {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(37,99,235,0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,0.07) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 75% 80% at 75% 50%, black 0%, transparent 80%);
}
:root.dark .hero-grid {
  background-image:
    linear-gradient(rgba(59,130,246,0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.1) 1px, transparent 1px);
}

.hero-tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 24px;
  display: flex; align-items: center; gap: 10px;
  opacity: 0; animation: fadeUp 0.5s 0.2s both;
}
.hero-tag::before { content: ''; width: 28px; height: 1px; background: var(--accent); }

.hero-h1 {
  font-family: var(--sans);
  font-size: clamp(48px, 7vw, 96px); font-weight: 700;
  line-height: 0.96; letter-spacing: -0.032em; max-width: 900px;
  margin-bottom: 32px; color: var(--fg);
  opacity: 0; animation: fadeUp 0.55s 0.4s both;
}
.typed-cursor {
  display: inline-block; width: 4px; height: 0.82em; background: var(--accent);
  vertical-align: middle; margin-left: 3px; border-radius: 1px;
  animation: blink 0.9s step-end infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }

.hero-sub {
  font-size: 17px; font-weight: 400; line-height: 1.65;
  color: var(--muted); max-width: 520px; margin-bottom: 48px;
  opacity: 0; animation: fadeUp 0.55s 0.7s both;
}
.hero-sub strong { color: var(--fg); font-weight: 500; }

.hero-ctas {
  display: flex; gap: 14px; flex-wrap: wrap;
  opacity: 0; animation: fadeUp 0.5s 0.95s both;
}
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; background: var(--accent); color: #fff;
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase;
  border: none; cursor: pointer; text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.35); }
.btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 28px; background: transparent; color: var(--fg);
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase;
  border: 1px solid var(--border); cursor: pointer; text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* dot matrix decoration */
.hero-floaters {
  position: absolute; right: 80px; top: 50%; transform: translateY(-50%);
  pointer-events: none; opacity: 0; animation: fadeUp 0.5s 1.2s both;
}
.dot-matrix { display: grid; grid-template-columns: repeat(9, 16px); gap: 12px; }
.dot-matrix span {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--accent); display: block;
}
.dot-matrix span:nth-child(7n+1) { opacity: 0.1; }
.dot-matrix span:nth-child(7n+2) { opacity: 0.14; }
.dot-matrix span:nth-child(7n+3) { opacity: 0.18; }
.dot-matrix span:nth-child(7n+4) { opacity: 0.22; }
.dot-matrix span:nth-child(7n+5) { opacity: 0.26; }
.dot-matrix span:nth-child(7n+6) { opacity: 0.3; }
.dot-matrix span:nth-child(7n) { opacity: 0.34; }

/* stat bar */
.stat-bar {
  display: flex; gap: 48px; padding: 40px 48px;
  border-top: 1px solid var(--border);
  opacity: 0; animation: fadeUp 0.5s 1.1s both;
}
.stat-num {
  font-family: var(--mono); font-size: 30px; font-weight: 700;
  letter-spacing: 0; color: var(--fg);
}
.stat-lbl {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--faint); margin-top: 4px;
}

/* about strip */
.about-strip {
  padding: 56px 48px; border-top: 1px solid var(--border);
  display: flex; align-items: flex-start; gap: 72px;
}
.about-lbl {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent); flex-shrink: 0; padding-top: 5px;
}
.about-body { font-size: 17px; line-height: 1.75; color: var(--muted); max-width: 640px; }
.about-body strong { color: var(--fg); font-weight: 600; }

/* section */
.sec { padding: 64px 48px 80px; border-top: 1px solid var(--border); }
.sec-head { display: flex; align-items: center; gap: 16px; margin-bottom: 40px; }
.sec-label {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--muted); flex-shrink: 0;
}
.sec-rule { flex: 1; height: 1px; background: var(--border); }
.sec-count { font-family: var(--mono); font-size: 11px; color: var(--accent); opacity: 0.5; }

/* CARDS A */
.cards-a {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1px; background: var(--border);
  border: 1px solid var(--border); border-radius: 10px; overflow: hidden;
}
.card-a {
  background: var(--bg); padding: 36px 32px;
  display: flex; flex-direction: column; gap: 14px;
  transition: background 0.2s; cursor: pointer; position: relative; overflow: hidden;
}
.card-a::before {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 2px;
  background: var(--accent); transform: scaleX(0); transform-origin: left;
  transition: transform 0.35s ease;
}
.card-a:hover { background: var(--accent-dim); }
.card-a:hover::before { transform: scaleX(1); }

/* CARDS B */
.cards-b { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card-b {
  background: var(--card-b-bg); border-radius: 12px; padding: 36px 32px;
  display: flex; flex-direction: column; gap: 14px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.35s;
  cursor: pointer; border: 1.5px solid transparent;
  color: var(--fg); text-decoration: none;
}
.card-b:not(a) {
  cursor: default;
}
.card-b:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(37,99,235,0.15), 0 2px 8px rgba(0,0,0,0.07);
  border-color: rgba(37,99,235,0.3);
}
:root.dark .card-b { box-shadow: 0 1px 3px rgba(0,0,0,0.3), 0 4px 16px rgba(0,0,0,0.2); }

/* CARDS C */
.cards-c { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.card-c {
  background: #0d1117; border-radius: 10px; overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  cursor: pointer;
}
.card-c:hover { transform: translateY(-4px); box-shadow: 0 16px 48px rgba(37,99,235,0.22); }
.card-c-bar {
  background: #161b22; border-bottom: 1px solid rgba(255,255,255,0.07);
  padding: 10px 16px; display: flex; align-items: center; gap: 6px;
}
.tbar-dot { width: 10px; height: 10px; border-radius: 50%; }
.tbar-name { font-family: var(--mono); font-size: 11px; color: rgba(255,255,255,0.3); margin-left: 8px; }
.card-c-body { padding: 24px; flex: 1; display: flex; flex-direction: column; gap: 12px; }

/* shared card parts */
.card-num { font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; color: var(--accent); opacity: 0.6; }
.card-num-green { font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; color: #3fb950; }
.card-title { font-size: 19px; font-weight: 600; letter-spacing: 0; line-height: 1.2; }
.card-year { font-family: var(--mono); font-size: 10px; letter-spacing: 0.12em; color: var(--faint); text-transform: uppercase; margin-top: -6px; }
.card-title-dark { font-family: var(--mono); font-size: 15px; font-weight: 500; color: #e6edf3; }
.card-desc { font-size: 14px; line-height: 1.6; color: var(--muted); flex: 1; }
.card-desc-dark { font-size: 13px; line-height: 1.6; color: #7d8590; font-family: var(--mono); flex: 1; }
.card-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--accent);
  background: none; border: none; cursor: pointer; padding: 0; transition: gap 0.2s;
}
.card-link:hover { gap: 10px; }
.card-link-dark {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: 0.08em;
  text-transform: uppercase; color: #58a6ff;
  background: none; border: none; cursor: pointer; padding: 0; transition: gap 0.2s;
}
.card-link-dark:hover { gap: 10px; }

/* BLOG */
.blog-header { padding: 80px 48px 56px; }
.blog-headline { font-family: var(--sans); font-size: clamp(36px, 5vw, 64px); font-weight: 700; letter-spacing: -0.035em; line-height: 1.6; margin-bottom: 12px; }
.blog-sub { font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; }
.blog-list { padding: 0 48px 80px; max-width: 720px; }
.blog-row {
  display: grid; grid-template-columns: 110px 1fr 28px;
  align-items: baseline; gap: 28px;
  padding: 28px 0; border-bottom: 1px solid var(--border);
  cursor: pointer; text-decoration: none; color: var(--fg);
  transition: padding-left 0.2s ease;
}
.blog-row:not(a) {
  cursor: default;
}
.blog-row:first-child { border-top: 1px solid var(--border); }
.blog-row:hover { padding-left: 10px; }
.blog-row:hover .blog-row-title { color: var(--accent); }
.blog-row:hover .blog-row-arrow { color: var(--accent); transform: translateX(4px); }
.blog-row-date { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; color: var(--faint); white-space: nowrap; }
.blog-row-title { font-size: 18px; font-weight: 500; letter-spacing: 0; line-height: 1.35; transition: color 0.2s; }
.blog-row-arrow { font-size: 16px; color: var(--faint); transition: color 0.2s, transform 0.2s; }

/* POST / GENERIC PAGE */
.post-full {
  max-width: 760px;
  margin: 0 auto;
  padding: 90px 48px 96px;
}
.post-back-link {
  display: inline-flex;
  margin-bottom: 32px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
}
.post-back-link:hover {
  color: var(--accent-strong);
}
.post-full-header {
  margin-bottom: 40px;
}
.post-full-header time {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}
.post-full-header h1 {
  margin-top: 14px;
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0;
}
.post-full-header p {
  margin-top: 20px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}
.post-full-image {
  width: min(100%, 960px);
  margin: 0 0 44px;
  border-radius: 10px;
}
.post-content {
  color: var(--fg);
  font-size: 18px;
  line-height: 1.75;
}
.post-content > * + * {
  margin-top: 1.25em;
}
.post-content a {
  color: var(--accent);
}
.post-content h2,
.post-content h3 {
  margin-top: 1.8em;
  font-weight: 700;
  line-height: 1.15;
}
.post-content p,
.post-content li {
  color: var(--muted);
}
.post-content strong {
  color: var(--fg);
}

.post-content figure {
  margin: 2.4em 0;
}

.post-content .kg-image-card {
  width: min(100vw - 96px, 528px);
  max-width: none;
  margin-left: 50%;
  transform: translateX(-50%);
}

.post-content .kg-image-card .kg-image {
  width: 100%;
  height: auto;
}

.post-content .kg-image-card figcaption {
  margin-top: 12px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.5;
  text-align: center;
}

/* CONTACT */
.contact-wrap {
  min-height: calc(100vh - 58px);
  display: flex; flex-direction: column; justify-content: center;
  padding: 80px 48px;
}
.contact-h1 {
  font-family: var(--sans);
  font-size: clamp(48px, 8vw, 100px); font-weight: 700;
  letter-spacing: -0.04em; line-height: 0.92;
  margin-bottom: 72px; max-width: 680px;
}
.contact-h1 span { color: var(--fg); }
.contact-rows { max-width: 640px; }
.contact-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 0; border-bottom: 1px solid var(--border);
  text-decoration: none; color: var(--fg);
  transition: padding-left 0.22s ease;
}
.contact-row:first-child { border-top: 1px solid var(--border); }
.contact-row:hover { padding-left: 14px; }
.contact-row:hover .contact-row-arrow { opacity: 1; transform: translateX(4px); color: var(--accent); }
.contact-row:hover .contact-row-title { color: var(--accent); }
.contact-row-type { font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--faint); min-width: 110px; }
.contact-row-title { font-size: 19px; font-weight: 500; letter-spacing: 0; flex: 1; padding: 0 20px; transition: color 0.22s; }
.contact-row-arrow { font-size: 18px; color: var(--faint); opacity: 0; transition: opacity 0.22s, transform 0.22s, color 0.22s; }

.post-content .kg-width-wide {
  width: min(100vw - 96px, 528px);
  max-width: none;
  margin-left: 50%;
  transform: translateX(-50%);
}

.post-content .kg-width-full {
  width: min(100vw - 96px, 588px);
  max-width: none;
  margin-left: 50%;
  transform: translateX(-50%);
}

/* cursor */
.cursor-dot {
  width: 6px; height: 6px; background: var(--accent);
  border-radius: 50%; position: fixed; pointer-events: none;
  z-index: 9999; transform: translate(-50%, -50%);
}
.cursor-ring {
  width: 30px; height: 30px;
  border: 1.5px solid rgba(37,99,235,0.35);
  border-radius: 50%; position: fixed; pointer-events: none;
  z-index: 9998; transform: translate(-50%, -50%);
  transition: left 0.1s ease, top 0.1s ease;
}
:root.dark .cursor-ring { border-color: rgba(59,130,246,0.4); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
  .nav { padding: 0 24px; }
  .hero { padding: 72px 24px 52px; }
  .hero-floaters { right: 24px; opacity: 0.18; }
  .stat-bar { padding: 34px 24px; gap: 28px; flex-wrap: wrap; }
  .about-strip { padding: 48px 24px; gap: 28px; flex-direction: column; }
  .sec { padding: 56px 24px 72px; }
  .cards-b, .cards-a, .cards-c { grid-template-columns: 1fr; }
  .blog-header { padding: 72px 24px 48px; }
  .blog-list { padding: 0 24px 72px; }
  .post-full { padding: 82px 24px 86px; }
  .post-full-header h1 { font-size: 54px; }
  .post-content .kg-image-card,
  .post-content .kg-width-wide,
  .post-content .kg-width-full {
    width: calc(100vw - 48px);
  }
  .contact-wrap { padding: 72px 24px; }
}

@media (max-width: 640px) {
  .nav { padding: 0 16px; }
  .nav-btn { padding: 6px 8px; font-size: 10px; }
  .dark-toggle { margin-left: 6px; }
  .hero { padding: 64px 16px 48px; }
  .hero-h1 { letter-spacing: 0; }
  .hero-sub { font-size: 16px; }
  .hero-floaters { display: none; }
  .stat-bar { padding: 32px 16px; display: grid; grid-template-columns: repeat(2, 1fr); }
  .about-strip { padding: 44px 16px; }
  .sec { padding: 52px 16px 64px; }
  .card-b, .card-a { padding: 28px 22px; }
  .blog-header { padding: 68px 16px 42px; }
  .blog-headline { letter-spacing: 0; }
  .blog-list { padding: 0 16px 64px; }
  .blog-row { grid-template-columns: 1fr 24px; gap: 14px; }
  .blog-row-date { grid-column: 1 / -1; }
  .post-full { padding: 74px 16px 76px; }
  .post-full-header h1 { font-size: 42px; }
  .post-content .kg-image-card,
  .post-content .kg-width-wide,
  .post-content .kg-width-full {
    width: calc(100vw - 32px);
  }
  .contact-wrap { padding: 68px 16px; }
  .contact-h1 { letter-spacing: 0; margin-bottom: 52px; }
  .contact-row { align-items: flex-start; flex-direction: column; gap: 8px; }
  .contact-row-title { padding: 0; }
  .contact-row-arrow { opacity: 1; }
.cursor-dot, .cursor-ring { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .cursor-dot,
  .cursor-ring {
    display: none;
  }
}