/* ---------- tokens ---------- */
/* TechStone brand: monochrome. Ink #020205, paper #f2f4f7. No accent hue. */
:root {
  --bg: #020205;
  --bg-elev: #0a0a0e;
  --bg-card: #0e0e13;
  --line: #1e1e25;
  --line-strong: #2e2e37;
  --fg: #f2f4f7;
  --fg-muted: #a4a7b0;
  --fg-dim: #6e717b;
  --accent: #f2f4f7;
  --accent-ink: #020205;
  --grid: rgba(242, 244, 247, 0.045);
  --glow: rgba(242, 244, 247, 0.09);
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-display: "Poppins", "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --max: 1080px;
  --radius: 14px;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f2f4f7;
    --bg-elev: #ffffff;
    --bg-card: #ffffff;
    --line: #dfe2e8;
    --line-strong: #c3c7cf;
    --fg: #020205;
    --fg-muted: #4a4d57;
    --fg-dim: #82858e;
    --accent: #020205;
    --accent-ink: #f2f4f7;
    --grid: rgba(2, 2, 5, 0.055);
    --glow: rgba(2, 2, 5, 0.06);
    color-scheme: light;
  }
}

/* ---------- base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: center top;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

p {
  margin: 0 0 1em;
}

.container {
  width: min(var(--max), calc(100% - 2.5rem));
  margin-inline: auto;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.eyebrow::before {
  content: "";
  width: 1.6rem;
  height: 1px;
  background: var(--accent);
}

section {
  padding: 5.5rem 0;
  border-top: 1px solid var(--line);
}

section h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.3rem);
  margin-bottom: 2rem;
}

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand .mark {
  width: 26px;
  height: 30px;
  color: var(--fg);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 1.6rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.92rem;
  color: var(--fg-muted);
}

.nav-links a:hover {
  color: var(--fg);
}

.nav-links .cta {
  color: var(--fg);
  font-weight: 500;
}

@media (max-width: 640px) {
  .nav-links li:not(:last-child) {
    display: none;
  }
}

/* ---------- hero ---------- */
.hero {
  border-top: 0;
  padding: 6rem 0 4.5rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto;
  height: 70%;
  background: radial-gradient(60% 60% at 30% 40%, var(--glow), transparent 70%);
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
  position: relative;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 700;
  margin: 0.6rem 0 1rem;
}

.hero h1 .accent {
  color: transparent;
  -webkit-text-stroke: 2px var(--fg);
  paint-order: stroke fill;
}

.hero .tagline {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--fg-muted);
  max-width: 44ch;
  margin-bottom: 1.6rem;
}

.hero .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.4rem;
  color: var(--fg-dim);
  margin-bottom: 2rem;
}

.hero .meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.hero .meta .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--fg);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--fg) 18%, transparent);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  font-size: 0.95rem;
  font-weight: 500;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: var(--fg-dim);
}

.btn.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}

.btn svg {
  width: 18px;
  height: 18px;
}

.portrait {
  position: relative;
  width: clamp(180px, 22vw, 260px);
  aspect-ratio: 1;
}

.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 24px;
  border: 1px solid var(--line-strong);
}

.portrait::after {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 32px;
  border: 1px dashed var(--line-strong);
  z-index: -1;
}

.portrait .badge {
  position: absolute;
  bottom: -14px;
  left: -14px;
  background: var(--bg-elev);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
}

.portrait .badge::before {
  content: "☕";
}

@media (max-width: 760px) {
  .hero .container {
    grid-template-columns: 1fr;
  }

  .portrait {
    order: -1;
    width: 150px;
  }
}

/* ---------- facts strip ---------- */
.facts {
  padding: 0 0 4rem;
  border-top: 0;
}

.facts .grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-elev);
}

.fact {
  padding: 1.4rem 1.5rem;
  border-right: 1px solid var(--line);
}

.fact:last-child {
  border-right: 0;
}

.fact .num {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.fact .label {
  color: var(--fg-muted);
  font-size: 0.9rem;
  margin-top: 0.2rem;
}

@media (max-width: 760px) {
  .facts .grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .fact:nth-child(2) {
    border-right: 0;
  }

  .fact:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }
}

/* ---------- about ---------- */
.about .cols {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 3rem;
}

.about .lead {
  font-size: 1.15rem;
  color: var(--fg);
}

.about p {
  color: var(--fg-muted);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
}

.card h3 {
  line-height: 1.3;
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.93rem;
  color: var(--fg-muted);
  margin: 0;
}

.card .icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  margin-bottom: 0.8rem;
  background: color-mix(in srgb, var(--fg) 10%, transparent);
  border: 1px solid var(--line-strong);
  color: var(--fg);
}

.card .icon svg {
  width: 18px;
  height: 18px;
}

@media (max-width: 760px) {
  .about .cols {
    grid-template-columns: 1fr;
  }
}

/* ---------- experience ---------- */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--line-strong);
}

.org {
  position: relative;
  margin-bottom: 3rem;
}

.org::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.org-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.org-head h3 {
  font-size: 1.35rem;
}

.org-head .span {
  color: var(--fg-dim);
}

.role {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 1.5rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.role .when {
  color: var(--fg-dim);
  padding-top: 0.15rem;
}

.role h4 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.role p {
  color: var(--fg-muted);
  font-size: 0.95rem;
  margin: 0;
}

.role.compact h4 {
  color: var(--fg-muted);
  font-weight: 500;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.6rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--line-strong);
  color: var(--fg-muted);
}

@media (max-width: 640px) {
  .role {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
}

/* ---------- recognition ---------- */
.recog .grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

@media (max-width: 960px) {
  .recog .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.recog .card {
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.recog a.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.recog .card .year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-dim);
  margin-bottom: 0.6rem;
}

.recog .card .more {
  margin-top: auto;
  padding-top: 1rem;
  font-size: 0.85rem;
  color: var(--accent);
}

@media (max-width: 760px) {
  .recog .grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- writing ---------- */
.writing .empty {
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  padding: 2.5rem;
  text-align: center;
  color: var(--fg-muted);
}

.writing .empty .mono {
  color: var(--accent);
  display: block;
  margin-bottom: 0.6rem;
}

.writing .empty p {
  margin: 0;
}

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem 0 3rem;
  color: var(--fg-dim);
  font-size: 0.9rem;
}

footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

footer a:hover {
  color: var(--fg);
}

footer .links {
  display: flex;
  gap: 1.4rem;
}

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}