:root {
  --bg: #eef4fc;
  --bg-soft: #ffffff;
  --panel: rgba(255, 255, 255, 0.72);
  --panel-border: rgba(40, 95, 175, 0.16);
  --shadow: 0 14px 40px rgba(40, 90, 170, 0.1);
  --text: #101d35;
  --text-dim: #44546f;
  --blue: #2f80ed;
  --sky: #4aa8ff;
  --indigo: #1f6fe0;
  --teal: #0aa2c0;
  --green: #0a9d76;
  --pink: #d6437a;
  --grad: linear-gradient(120deg, #4aa8ff 0%, #2f80ed 55%, #1f6fe0 100%);
  --radius: 18px;
  --maxw: 1120px;
  --font: "Space Grotesk", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  font-family: var(--font);
  background: linear-gradient(180deg, #ffffff 0%, #eef4fc 40%, #e6eef9 100%);
  background-attachment: fixed;
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  cursor: none;
}

body.no-cursor-fx {
  cursor: auto;
}

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

::selection {
  background: rgba(47, 128, 237, 0.22);
  color: var(--text);
}

/* ---- background grid + 3D canvas ----------------------------------- */
#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* Readability scrim: mutes the 3D scene so text stays high-contrast */
.scene-scrim {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(248, 251, 255, 0.55) 0%,
    rgba(244, 248, 253, 0.45) 50%,
    rgba(240, 246, 253, 0.5) 100%
  );
}

.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image: radial-gradient(
      circle at 50% 0%,
      rgba(47, 128, 237, 0.07),
      transparent 60%
    ),
    linear-gradient(rgba(47, 128, 237, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 128, 237, 0.05) 1px, transparent 1px);
  background-size: 100% 100%, 46px 46px, 46px 46px;
  mask-image: radial-gradient(circle at 50% 40%, #000 0%, transparent 85%);
}

main {
  position: relative;
  z-index: 2;
}

/* ---- custom cursor -------------------------------------------------- */
.cursor-dot,
.cursor-ring {
  position: fixed;
  top: 0;
  left: 0;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
}
.cursor-dot {
  width: 7px;
  height: 7px;
  background: var(--blue);
}
.cursor-ring {
  width: 36px;
  height: 36px;
  border: 1.5px solid rgba(47, 128, 237, 0.6);
  transition: width 0.25s, height 0.25s, border-color 0.25s, background 0.25s;
}
.cursor-ring.hovering {
  width: 58px;
  height: 58px;
  border-color: var(--blue);
  background: rgba(47, 128, 237, 0.08);
}

/* ---- loader --------------------------------------------------------- */
#loader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: #ffffff;
  display: grid;
  place-items: center;
  transition: opacity 0.8s ease, visibility 0.8s;
}
#loader.done {
  opacity: 0;
  visibility: hidden;
}
.loader-inner {
  text-align: center;
}
.loader-glyph {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.4em;
  color: var(--blue);
  text-transform: uppercase;
}
.loader-bar {
  width: 220px;
  height: 2px;
  background: rgba(47, 128, 237, 0.15);
  margin: 18px auto 0;
  overflow: hidden;
  border-radius: 2px;
}
.loader-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--grad);
  transition: width 0.2s;
}

/* ---- nav ------------------------------------------------------------ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px clamp(20px, 5vw, 60px);
  transition: background 0.3s, backdrop-filter 0.3s, padding 0.3s,
    box-shadow 0.3s;
}
.nav.scrolled {
  padding: 14px clamp(20px, 5vw, 60px);
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--panel-border);
  box-shadow: 0 6px 24px rgba(40, 90, 170, 0.06);
}
.nav-logo {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-logo .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 14px var(--sky);
}
.nav-links {
  display: flex;
  gap: 28px;
  font-size: 14px;
}
.nav-links a {
  color: var(--text-dim);
  position: relative;
  transition: color 0.2s;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 1.5px;
  background: var(--grad);
  transition: width 0.25s;
}
.nav-links a:hover {
  color: var(--text);
}
.nav-links a:hover::after {
  width: 100%;
}
.nav-cta {
  font-family: var(--mono);
  font-size: 13px;
  padding: 9px 16px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.6);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.nav-cta:hover {
  border-color: var(--blue);
  box-shadow: 0 0 22px rgba(47, 128, 237, 0.2);
}

@media (max-width: 760px) {
  .nav-links {
    display: none;
  }
}

/* ---- layout --------------------------------------------------------- */
section {
  padding: clamp(80px, 12vh, 140px) clamp(20px, 5vw, 60px);
  max-width: var(--maxw);
  margin: 0 auto;
}
.section-tag {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--blue);
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.section-tag::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--blue);
}
.section-title {
  font-size: clamp(28px, 4.5vw, 46px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.section-intro {
  color: var(--text-dim);
  max-width: 640px;
  font-size: 17px;
}

/* ---- hero ----------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 60px);
}
.hero-eyebrow {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 0.15em;
  margin-bottom: 22px;
  opacity: 0;
  transform: translateY(20px);
}
.hero-eyebrow b {
  color: var(--green);
  font-weight: 500;
}
.hero h1 {
  font-size: clamp(44px, 9vw, 118px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.035em;
  margin-bottom: 10px;
}
.hero h1 .line {
  display: block;
  overflow: hidden;
}
.hero h1 .line span {
  display: inline-block;
  transform: translateY(110%);
}
.hero h1 .grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-role {
  font-family: var(--mono);
  font-size: clamp(16px, 2.4vw, 24px);
  color: var(--text);
  margin: 18px 0 26px;
  min-height: 1.4em;
  opacity: 0;
}
.hero-role .caret {
  color: var(--blue);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink {
  50% {
    opacity: 0;
  }
}
.hero-sub {
  max-width: 560px;
  color: var(--text-dim);
  font-size: 17px;
  margin-bottom: 34px;
  opacity: 0;
  transform: translateY(20px);
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(20px);
}
.btn {
  font-family: var(--mono);
  font-size: 14px;
  padding: 14px 26px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}
.btn-primary {
  background: var(--grad);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(47, 128, 237, 0.28);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(47, 128, 237, 0.4);
}
.btn-ghost {
  border: 1px solid var(--panel-border);
  color: var(--text);
  background: rgba(255, 255, 255, 0.6);
}
.btn-ghost:hover {
  border-color: var(--blue);
  transform: translateY(-2px);
}
.hero-scroll {
  position: absolute;
  bottom: 34px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--text-dim);
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0;
}
.hero-scroll .mouse {
  width: 22px;
  height: 36px;
  border: 1.5px solid var(--text-dim);
  border-radius: 12px;
  position: relative;
}
.hero-scroll .mouse::after {
  content: "";
  position: absolute;
  top: 7px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 7px;
  border-radius: 2px;
  background: var(--blue);
  animation: scrolldot 1.6s ease-in-out infinite;
}
@keyframes scrolldot {
  0% {
    opacity: 0;
    transform: translate(-50%, 0);
  }
  40% {
    opacity: 1;
  }
  80% {
    opacity: 0;
    transform: translate(-50%, 12px);
  }
}

/* ---- shared card surface ------------------------------------------- */
.stat,
.about-card,
.skill-card,
.hl-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}

/* ---- stats ---------------------------------------------------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}
.stat {
  padding: 26px 20px;
  text-align: center;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.stat:hover {
  transform: translateY(-6px);
  border-color: rgba(47, 128, 237, 0.45);
  box-shadow: 0 18px 44px rgba(40, 90, 170, 0.16);
}
.stat .num {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-family: var(--mono);
}
.stat .lbl {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 6px;
}
@media (max-width: 860px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---- about ---------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: start;
}
.about-text p {
  font-size: 19px;
  color: var(--text);
  margin-bottom: 18px;
}
.about-text p.dim {
  color: var(--text-dim);
  font-size: 17px;
}
.about-card {
  padding: 26px;
}
.about-card h4 {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 16px;
}
.about-card .row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid rgba(20, 50, 95, 0.08);
  font-size: 15px;
}
.about-card .row:last-child {
  border-bottom: none;
}
.about-card .row span:last-child {
  color: var(--text-dim);
}
.edu-item {
  margin-top: 18px;
}
.edu-item .deg {
  font-weight: 600;
}
.edu-item .sch {
  color: var(--text-dim);
  font-size: 14px;
}
@media (max-width: 820px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- skills --------------------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 40px;
}
.skill-card {
  padding: 26px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.skill-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    400px circle at var(--mx, 50%) var(--my, 0%),
    rgba(47, 128, 237, 0.1),
    transparent 40%
  );
  opacity: 0;
  transition: opacity 0.3s;
}
.skill-card:hover {
  transform: translateY(-6px);
  border-color: rgba(47, 128, 237, 0.4);
  box-shadow: 0 18px 44px rgba(40, 90, 170, 0.16);
}
.skill-card:hover::before {
  opacity: 1;
}
.skill-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(
    135deg,
    rgba(74, 168, 255, 0.18),
    rgba(47, 128, 237, 0.22)
  );
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  color: var(--blue);
}
.skill-card h3 {
  font-size: 18px;
  margin-bottom: 14px;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag {
  font-family: var(--mono);
  font-size: 12px;
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(31, 90, 165, 0.06);
  border: 1px solid rgba(31, 90, 165, 0.14);
  color: var(--text-dim);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.tag:hover {
  color: var(--blue);
  border-color: var(--blue);
  background: rgba(47, 128, 237, 0.1);
}
@media (max-width: 880px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- timeline ------------------------------------------------------- */
.timeline {
  position: relative;
  margin-top: 50px;
  padding-left: 30px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--sky),
    var(--blue),
    var(--indigo),
    transparent
  );
}
.tl-item {
  position: relative;
  padding: 0 0 46px 36px;
  opacity: 0;
  transform: translateX(-24px);
}
.tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #ffffff;
  border: 2px solid var(--accent, var(--blue));
  box-shadow: 0 0 12px var(--accent, var(--blue));
}
.tl-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: 6px;
}
.tl-role {
  font-size: 21px;
  font-weight: 600;
}
.tl-company {
  font-family: var(--mono);
  color: var(--accent, var(--blue));
  font-size: 15px;
}
.tl-meta {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 14px;
}
.tl-points {
  list-style: none;
  display: grid;
  gap: 9px;
}
.tl-points li {
  position: relative;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 15.5px;
}
.tl-points li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--accent, var(--blue));
}

/* ---- highlights ----------------------------------------------------- */
.hl-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 40px;
}
.hl-card {
  padding: 24px;
  display: flex;
  gap: 16px;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
  opacity: 0;
  transform: translateY(24px);
}
.hl-card:hover {
  transform: translateY(-5px);
  border-color: rgba(47, 128, 237, 0.4);
  box-shadow: 0 18px 44px rgba(40, 90, 170, 0.16);
}
.hl-kind {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 9px;
  border-radius: 6px;
  height: fit-content;
  white-space: nowrap;
}
.hl-kind[data-k="Patent"] {
  background: rgba(47, 128, 237, 0.14);
  color: var(--blue);
}
.hl-kind[data-k="Speaking"] {
  background: rgba(10, 162, 192, 0.14);
  color: var(--teal);
}
.hl-kind[data-k="Research"] {
  background: rgba(10, 157, 118, 0.14);
  color: var(--green);
}
.hl-kind[data-k="Outreach"] {
  background: rgba(214, 67, 122, 0.14);
  color: var(--pink);
}
.hl-kind[data-k="More"] {
  background: var(--grad);
  color: #ffffff;
}
.hl-card h3 {
  font-size: 17px;
  margin-bottom: 6px;
}
.hl-card p {
  color: var(--text-dim);
  font-size: 14.5px;
}

/* linked / clickable cards */
.hl-card.is-link {
  position: relative;
  text-decoration: none;
}
.hl-arrow {
  position: absolute;
  top: 22px;
  right: 22px;
  color: var(--blue);
  opacity: 0.6;
  transition: transform 0.25s, opacity 0.25s;
}
.hl-card.is-link:hover .hl-arrow {
  opacity: 1;
  transform: translate(3px, -3px);
}

/* featured talk — spans full width with a stronger accent */
.hl-card.featured {
  grid-column: 1 / -1;
  border-color: rgba(47, 128, 237, 0.4);
  background: linear-gradient(
      135deg,
      rgba(74, 168, 255, 0.1),
      rgba(47, 128, 237, 0.04)
    ),
    var(--panel);
  box-shadow: 0 16px 44px rgba(40, 90, 170, 0.14);
}
.hl-card.featured h3 {
  font-size: 19px;
}
@media (max-width: 760px) {
  .hl-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- contact -------------------------------------------------------- */
.contact {
  text-align: center;
  padding-bottom: 90px;
}
.contact h2 {
  font-size: clamp(34px, 7vw, 76px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 22px;
}
.contact h2 .grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.contact p {
  color: var(--text-dim);
  max-width: 520px;
  margin: 0 auto 34px;
  font-size: 18px;
}
.contact-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.footer {
  text-align: center;
  padding: 30px 20px 40px;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 12.5px;
  position: relative;
  z-index: 2;
}
.footer .links {
  display: flex;
  gap: 18px;
  justify-content: center;
  margin-bottom: 14px;
}
.footer .links a:hover {
  color: var(--blue);
}

/* ---- reveal animation hook ----------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(34px);
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .reveal,
  .tl-item,
  .hl-card,
  .hero-eyebrow,
  .hero-sub,
  .hero-actions {
    opacity: 1 !important;
    transform: none !important;
  }
}