:root {
  --blue: #2563eb;
  --blue-d: #1d4ed8;
  --text: #0f172a;
  --navy: #0f172a;
  --white: #fff;
  --bg: #f8faff;
  --light: #eff6ff;
  --muted: #64748b;
  --line: #e2e8f0;
  --r: 8px;
  --s: clamp(64px, 9vw, 104px);
  --head: Sora, system-ui, sans-serif;
}
* {
  box-sizing: border-box;
  margin: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}
body {
  font:
    400 16px/1.7 Inter,
    system-ui,
    sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
}
ul,
ol {
  list-style: none;
  padding: 0;
}
img {
  max-width: 100%;
}
:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}
.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}
.skip {
  position: absolute;
  left: -999px;
}
.skip:focus {
  left: 8px;
  top: 8px;
  background: #fff;
  padding: 8px;
  z-index: 99;
}
h1,
h2,
h3 {
  font-family: var(--head);
  line-height: 1.15;
}
h1 {
  font-size: clamp(2.5rem, 6.2vw, 4.3rem);
  font-weight: 800;
  letter-spacing: -0.035em;
}
h1 span {
  color: var(--blue);
}
h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}
h3 {
  font-size: 1.05rem;
  font-weight: 700;
}
.muted {
  color: var(--muted);
}
.eyebrow {
  font:
    600 0.78rem Inter,
    sans-serif;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 10px;
}
.ic {
  width: 18px;
  height: 18px;
  flex: none;
}
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(248, 250, 255, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid transparent;
  transition: 0.2s;
}
.nav.scrolled {
  border-color: var(--line);
  box-shadow: 0 2px 14px rgba(15, 23, 42, 0.05);
}
.nav-in {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}
.logo {
  font: 800 1.4rem var(--head);
  text-decoration: none;
}
.logo span {
  color: var(--blue);
}
#navlinks {
  display: flex;
  gap: 24px;
}
#navlinks a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  padding: 21px 0;
  display: block;
  border-bottom: 3px solid transparent;
}
#navlinks a:hover {
  color: var(--text);
}
#navlinks a.active {
  color: var(--blue);
  border-color: var(--blue);
}
.burger {
  display: none;
  background: none;
  border: 0;
  padding: 10px;
  cursor: pointer;
}
.burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
}
.hero {
  position: relative;
  padding: clamp(48px, 8vw, 100px) 0;
  overflow: hidden;
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.86rem;
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--line);
  padding: 5px 14px;
  border-radius: 99px;
  margin-bottom: 22px;
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.2);
}
.sub {
  color: var(--blue-d);
  font-weight: 600;
  margin: 16px 0 18px;
}
.lead {
  max-width: 56ch;
  color: #334155;
  margin-bottom: 30px;
}
.btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--r);
  text-decoration: none;
  font:
    600 0.92rem Inter,
    sans-serif;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition:
    transform 0.15s,
    background 0.15s,
    box-shadow 0.15s;
}
.btn:hover {
  transform: translateY(-2px);
}
.solid {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.28);
}
.solid:hover {
  background: var(--blue-d);
}
.line {
  border-color: #cbd5e1;
  background: #fff;
  color: var(--blue-d);
}
.line:hover {
  border-color: var(--blue);
}
.ghost {
  border-color: var(--blue);
  color: var(--blue);
}
.ghost:hover {
  background: var(--light);
}
.btn:disabled {
  opacity: 0.6;
  cursor: wait;
  transform: none;
}
.social {
  display: flex;
  gap: 10px;
}
.social a,
.social .off {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #fff;
  transition: 0.15s;
}
.social a:hover {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
.social .off {
  opacity: 0.45;
  border-style: dashed;
  cursor: not-allowed;
}
.frame {
  position: relative;
  aspect-ratio: 4/5;
  max-width: 340px;
  justify-self: center;
  width: 100%;
}
.ph {
  position: relative;
  height: 80%;
  background: var(--light);
  border-radius: var(--r);
  display: grid;
  place-content: center;
  text-align: center;
  font-weight: 600;
  overflow: hidden;
  border: 1px solid var(--line);
}
.ph small {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.75rem;
}
.ph img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.sec {
  padding: var(--s) 0;
  border-top: 1px solid var(--line);
}
.edu {
  position: relative;
  max-width: 860px;
  border-left: 2px solid var(--line);
  margin-left: 22px;
}
.edu li {
  position: relative;
  display: flex;
  justify-content: space-between;
  gap: 32px;
  padding: 0 0 44px 44px;
}
.edu li:last-child {
  padding-bottom: 0;
}
.edu .node {
  position: absolute;
  left: -23px;
  top: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--blue);
  color: var(--blue);
  display: grid;
  place-items: center;
}
.edu li:last-child .node {
  border-color: #93c5fd;
  color: #60a5fa;
}
.edu h3 {
  font-size: 1.2rem;
  margin-bottom: 6px;
}
.edu .meta {
  display: grid;
  gap: 2px;
  color: var(--muted);
  font-size: 0.95rem;
}
.edu .meta b {
  color: var(--text);
  font-weight: 600;
}
.now {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--blue-d);
  background: var(--light);
  border: 1px solid var(--line);
  padding: 1px 10px;
  border-radius: 99px;
  margin-bottom: 8px;
}
.ph-txt {
  color: #94a3b8;
  font-style: italic;
}
.score-n {
  text-align: right;
  flex: none;
}
.score-n strong {
  display: block;
  font: 800 2.8rem/1 var(--head);
  color: var(--blue);
}
.score-n span {
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tech {
  display: grid;
  justify-items: center;
  gap: 7px;
  font-size: 0.76rem;
  text-align: center;
  color: var(--muted);
  transition: transform 0.15s;
}
.tech:hover {
  transform: translateY(-3px);
  color: var(--text);
}
.tile {
  width: 54px;
  height: 54px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
  display: grid;
  place-items: center;
  font: 700 0.72rem var(--head);
  color: var(--blue-d);
}
.tile.mono {
  background: var(--light);
}
.tile img {
  width: 30px;
  height: 30px;
}
.tile b {
  font-size: 0.72rem;
}
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--line);
}
.tab {
  background: none;
  border: 0;
  font:
    600 0.95rem Inter,
    sans-serif;
  color: var(--muted);
  padding: 10px 18px;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
}
.tab[aria-selected="true"] {
  color: var(--blue);
  border-color: var(--blue);
}
.proj:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.12);
}
.pb {
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}
.pb h3 {
  font-size: 1.15rem;
}
.pb p {
  color: var(--muted);
  font-size: 0.95rem;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tags li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  padding: 2px 10px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 99px;
}
.tl {
  width: 15px;
  height: 15px;
}
.links {
  margin-top: auto;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.links .btn {
  padding: 8px 16px;
  font-size: 0.85rem;
}
.research {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 6px solid var(--blue);
  border-radius: var(--r);
  padding: 28px;
  max-width: 820px;
  border-left-width: 4px;
  padding: 28px;
  box-shadow: none;
}
.research p {
  color: var(--muted);
  margin: 10px 0 20px;
}
.research dl {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 8px;
}
.research dt {
  font-size: 0.8rem;
  color: var(--muted);
}
.research dd {
  font-weight: 600;
}
.bt {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
}
.interests {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--line);
}
.int {
  padding: 26px 26px 26px 0;
  border-bottom: 1px solid var(--line);
}
.int:nth-child(odd) {
  border-right: 1px solid var(--line);
}
.int:nth-child(even) {
  padding-left: 26px;
}
.ib {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  margin-bottom: 14px;
  background: var(--light);
  color: var(--blue);
}
.ib .ic {
  width: 22px;
  height: 22px;
}
.int:nth-child(2) .ib {
  background: #fef3c7;
  color: #d97706;
}
.int:nth-child(3) .ib {
  background: #dcfce7;
  color: #16a34a;
}
.int p {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 6px;
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
}
.clist {
  margin-top: 26px;
}
.clist li {
  display: flex;
  gap: 14px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.clist .ic {
  color: var(--blue);
  width: 20px;
  height: 20px;
}
.clist span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
}
.clist a {
  color: var(--blue-d);
  font-weight: 500;
}
form {
  display: grid;
  gap: 16px;
  background: #fff;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);

}
label {
  display: grid;
  gap: 6px;
  font-weight: 600;
  font-size: 0.88rem;
}
input,
textarea {
  font: inherit;
  padding: 11px 12px;
  border: 1px solid #cbd5e1;
  border-radius: var(--r);
  background: var(--bg);
  color: var(--text);
  transition:
    border-color 0.15s,
    box-shadow 0.15s;
}
input:focus,
textarea:focus {
  outline: 0;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18);
  background: #fff;
}
input[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: #dc2626;
}
.err {
  color: #b91c1c;
  font-size: 0.8rem;
  font-weight: 500;
}
#formStatus {
  font-size: 0.9rem;
  font-weight: 500;
}
#formStatus.ok {
  color: #15803d;
}
#formStatus.error {
  color: #b91c1c;
}
.foot {
  border-top: 1px solid var(--line);
  padding: 44px 0 20px;
  background: #fff;
}
.foot strong {
  font-family: var(--head);
}
.foot p {
  color: var(--muted);
}
.foot-in {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}
.copy {
  margin-top: 28px;
  font-size: 0.82rem;
  color: var(--muted);
}
.totop {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 0;
  background: var(--blue);
  color: #fff;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: 0.2s;
  display: grid;
  place-items: center;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}
.totop.show {
  opacity: 1;
  pointer-events: auto;
}
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 0.6s,
    transform 0.6s;
}
.reveal.in {
  opacity: 1;
  transform: none;
}
.pvw {
  overflow: hidden;
  background: var(--navy);
}
.proj:hover .pv {
  transform: scale(1.04);
}
.pv-tag {
  position: absolute;
  right: 10px;
  bottom: 8px;
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #64748b;
  opacity: 0.8;
}
.pv-ipl,
.pv-water .pv-tag {
  color: #93c5fd;
}
.pv-ipl {
  background: #0b1e40;
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  color: #fff;
  font-family: var(--head);
}
.sb-h {
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: #60a5fa;
}
.sb-row {
  display: grid;
  grid-template-columns: 34px 1fr auto;
  grid-template-areas: "i b e" "i s s";
  align-items: center;
  gap: 0 12px;
  background: #102a56;
  padding: 10px 14px;
  border-left: 4px solid #334155;
}
.sb-row.live {
  border-color: #fbbf24;
}
.sb-row i {
  grid-area: i;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #2563eb;
  font-style: normal;
  font-weight: 700;
}
.sb-row b {
  grid-area: b;
}
.sb-row em {
  grid-area: e;
  font-style: normal;
  font-size: 1.4rem;
  font-weight: 800;
}
.sb-row small {
  grid-area: s;
  color: #93c5fd;
  font-size: 0.72rem;
}
.wp {
  display: flex;
  height: 26px;
  border-radius: 3px;
  overflow: hidden;
  font-size: 0.72rem;
  font-weight: 700;
}
.wp span {
  display: flex;
  align-items: center;
  padding: 0 10px;
  background: #334155;
}
.wp span + span {
  flex: 1;
  background: #2563eb;
}
.pv-net {
  background: #eff6ff;
  display: grid;
  place-items: center;
}
.pv-net svg {
  width: 100%;
  max-height: 100%;
}
.flow {
  animation: dash 1.2s linear infinite;
}
@keyframes dash {
  to {
    stroke-dashoffset: -24;
  }
}
.pv-cnn {
  background: #f8fafc;
  display: flex;
  flex-direction: column;
}
.win {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 12px;
  background: #fff;
  border-bottom: 1px solid var(--line);
  font-size: 0.72rem;
  color: var(--muted);
}
.win i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #cbd5e1;
}
.win span {
  margin-left: 8px;
}
.cnn-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-around;
  gap: 10px;
  padding: 14px;
  flex-wrap: wrap;
}
.pv-cnn figure {
  width: 120px;
}
.pv-cnn figure svg {
  width: 100%;
  display: block;
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(16, 42, 86, 0.2);
}
.pv-cnn figcaption {
  font-size: 0.68rem;
  color: var(--muted);
  margin-top: 4px;
}
.maps {
  display: flex;
  align-items: center;
  gap: 6px;
}
.maps b {
  background: #2563eb;
  border-radius: 3px;
}
.pred {
  min-width: 110px;
  font-size: 0.78rem;
}
.pred small {
  color: var(--muted);
}
.pred strong {
  display: block;
  font: 700 1.1rem var(--head);
  color: var(--navy);
  margin-bottom: 6px;
}
.pred p {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 3px 0;
}
.pred u {
  flex: 1;
  height: 6px;
  background: #dbeafe;
}
.pred s {
  display: block;
  height: 100%;
  background: #2563eb;
}
.pv-score {
  background: #fff;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.ps-h {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.ps-h small {
  color: var(--muted);
  font-size: 0.78rem;
}
.ps-h strong {
  font: 800 2rem var(--head);
  color: var(--navy);
}
.ov {
  flex: 1;
  display: flex;
  align-items: flex-end;
  gap: 6px;
  border-bottom: 2px solid var(--navy);
  min-height: 80px;
}
.ov b {
  flex: 1;
  background: #2563eb;
}
.ov b.fc {
  background: #bfdbfe;
  border: 1.5px dashed #2563eb;
  border-bottom: 0;
}
.st {
  display: flex;
  gap: 18px;
  font-size: 0.72rem;
  color: var(--muted);
}
.st b {
  display: block;
  color: var(--navy);
  font-size: 0.95rem;
}
.pv-water svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.wv {
  animation: sway 7s ease-in-out infinite alternate;
}
.w2 {
  animation-duration: 5s;
  animation-direction: alternate-reverse;
}
.w3 {
  animation-duration: 9s;
}
@keyframes sway {
  to {
    transform: translateX(-40px);
  }
}
.rip ellipse {
  transform-origin: 210px 82px;
  animation: ripple 3.6s ease-out infinite;
}
.rip ellipse:nth-child(2) {
  animation-delay: 1.2s;
}
.rip ellipse:nth-child(3) {
  animation-delay: 2.4s;
}
@keyframes ripple {
  from {
    transform: scale(0.4);
    opacity: 0.9;
  }
  to {
    transform: scale(4);
    opacity: 0;
  }
}
@media (max-width: 900px) {
  .burger {
    display: block;
  }
  #menu {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    display: none;
  }
  #menu.open {
    display: block;
  }
  #navlinks {
    flex-direction: column;
    gap: 0;
    padding: 6px 24px;
  }
  #navlinks a {
    padding: 12px 0;
    border: 0;
  }
  .hero-grid,
  .contact-grid,
  .bt {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .frame {
    max-width: 260px;
    order: -1;
    margin: 0 16px 16px 0;
  }
  .research dl {
    grid-template-columns: 1fr;
  }
  .edu li {
    flex-direction: column;
    gap: 12px;
  }
  .score-n {
    text-align: left;
  }
}
@media (max-width: 520px) {
  .interests {
    grid-template-columns: 1fr;
  }
  .int,
  .int:nth-child(n) {
    padding: 22px 0;
    border-right: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    transition: none !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
  .flow,
  .wv,
  .rip ellipse {
    animation: none;
  }
}

/* ---- final layout ---- */
.about-text {
  max-width: 720px;
}
.about-text p {
  margin-bottom: 1.1em;
  font-size: 1.05rem;
}
.sub-h {
  font-size: 1.25rem;
  margin: 56px 0 28px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.edu {
  margin-top: 4px;
}
.skills {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 44px 56px;
}
.cat {
  border-top: 2px solid var(--text);
  padding-top: 16px;
}
.cat:last-child {
  grid-column: auto;
}
.cat h3 {
  margin-bottom: 18px;
}
.logos {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px 12px;
}
.cat:last-child .logos {
  grid-template-columns: repeat(8, 1fr);
}
.projects {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.proj {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.05);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}
.proj:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
}
.pvw {
  aspect-ratio: 16/10;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.pv {
  position: absolute;
  inset: 0;
  min-height: 0;
  transition: transform 0.5s;
}
.score {
  display: inline-block;
  margin-top: 28px;
  padding: 12px 18px;
  background: var(--light);
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  border-radius: var(--r);
  font-weight: 600;
  color: var(--blue-d);
}
.foot-in {
  justify-content: space-between;
}
.foot .social a,
.foot .social .off {
  width: 38px;
  height: 38px;
}
@media (max-width: 760px) {
  .projects,
  .skills {
    grid-template-columns: 1fr;
  }
}
  .cat:last-child .logos {
    grid-template-columns: repeat(4, 1fr);
  }
}
@media (max-width: 600px) {
  .pv-ipl {
    padding: 14px;
    gap: 8px;
  }
  .sb-row {
    padding: 6px 10px;
  }
  .sb-row em {
    font-size: 1.1rem;
  }
  .cnn-body {
    flex-wrap: nowrap;
    gap: 6px;
    padding: 8px;
  }
  .pv-cnn figure {
    width: 88px;
  }
  .pred {
    min-width: 84px;
  }
  .ps-h strong {
    font-size: 1.5rem;
  }
  .pv-score {
    padding: 14px;
    gap: 8px;
  }
}