:root {
  /* Default: light mode */
  --bg: #f3f9ff;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-solid: #ffffff;
  --surface-soft: #eaf5ff;
  --surface-glass: rgba(255, 255, 255, 0.78);

  --text: #102038;
  --muted: #4f647f;

  --accent: #2918ff;
  --accent-dark: #190fc4;
  --accent-soft: #14b9ff;
  --accent-cyan: #00aeef;
  --accent-blue: #119dff;

  --toggle-bg: #d7ecff;
  --toggle-thumb: #ffffff;

  --line: rgba(16, 32, 56, 0.13);
  --shadow: rgba(15, 46, 89, 0.12);

  --radius: 18px;
  --container: min(1120px, 92vw);

  --header-scale: 1;
  --header-base-padding: 0.85rem;
  --header-base-brand-size: 1rem;
  --header-base-nav-size: 0.92rem;

  --footer-scale: 0.72;
  --footer-base-padding: 0.85rem;
  --footer-base-icon-size: 2.35rem;
}

body.dark-theme {
  --bg: #061225;
  --surface: rgba(12, 31, 58, 0.84);
  --surface-solid: #0c1f3a;
  --surface-soft: #102b50;
  --surface-glass: rgba(6, 18, 37, 0.82);

  --text: #f5fbff;
  --muted: #b7c9dd;

  --accent: #5936ff;
  --accent-dark: #3c22d8;
  --accent-soft: #12b7ff;
  --accent-cyan: #00aeef;
  --accent-blue: #119dff;

  --toggle-bg: #132542;
  --toggle-thumb: #041225;

  --line: rgba(245, 251, 255, 0.15);
  --shadow: rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

/* Announcement bar */

.announcement-bar {
  position: sticky;
  top: var(--header-height, 4.2rem);
  z-index: 19;
  display: flex;
  align-items: stretch;
  justify-content: center;
  background:
          linear-gradient(90deg, rgba(0, 174, 239, 0.18), rgba(89, 54, 255, 0.18)),
          var(--surface-glass);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.announcement-link {
  flex: 1;
  padding: 0.68rem 1rem;
  text-align: center;
  color: var(--text);
  text-decoration: none;
  font-weight: 750;
}

.announcement-link strong {
  color: var(--accent);
  font-weight: 950;
}

.announcement-link:hover,
.announcement-link:focus-visible {
  color: var(--accent);
}

.announcement-close {
  width: 2.6rem;
  min-height: 100%;
  padding: 0;
  border-radius: 0;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  box-shadow: none;
  font-size: 1.35rem;
}

.announcement-close:hover,
.announcement-close:focus-visible {
  background: var(--surface-soft);
  color: var(--text);
  box-shadow: none;
}

.announcement-bar.is-hidden {
  display: none;
}

/* TEDx section */

.tedx-section {
  position: relative;
}

.tedx-layout {
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: clamp(1.6rem, 5vw, 4rem);
  align-items: center;
}

.tedx-copy {
  max-width: 680px;
}

.tedx-copy h2 {
  max-width: 13ch;
}

.tedx-video-card {
  padding: 0;
  overflow: hidden;
  text-decoration: none;
  color: var(--text);
  box-shadow: 0 22px 64px var(--shadow);
  transition:
          transform 180ms ease,
          border-color 180ms ease,
          box-shadow 180ms ease;
}

.tedx-video-card:hover,
.tedx-video-card:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(0, 174, 239, 0.45);
  box-shadow: 0 26px 72px var(--shadow);
}

.tedx-thumbnail {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background:
          radial-gradient(circle at 20% 20%, rgba(0, 174, 239, 0.18), transparent 10rem),
          linear-gradient(135deg, rgba(17, 157, 255, 0.14), rgba(89, 54, 255, 0.16)),
          var(--surface-soft);
  border-bottom: 1px solid var(--line);
}

.tedx-thumbnail img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transition:
          transform 240ms ease,
          filter 240ms ease;
}

.tedx-video-card:hover .tedx-thumbnail img,
.tedx-video-card:focus-visible .tedx-thumbnail img {
  transform: scale(1.04);
  filter: brightness(0.86);
}

.tedx-thumbnail::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
          linear-gradient(180deg, transparent 42%, rgba(0, 0, 0, 0.48)),
          radial-gradient(circle at center, rgba(0, 174, 239, 0.12), transparent 14rem);
  pointer-events: none;
}

.tedx-play {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 4.4rem;
  height: 4.4rem;
  border-radius: 999px;
  background: var(--accent-blue);
  color: #ffffff;
  font-size: 1.45rem;
  transform: translate(-50%, -50%);
  box-shadow:
          inset 0 1px 0 rgba(255, 255, 255, 0.24),
          0 18px 42px rgba(0, 174, 239, 0.32);
  transition:
          background 180ms ease,
          transform 180ms ease;
}

.tedx-video-card:hover .tedx-play,
.tedx-video-card:focus-visible .tedx-play {
  background: var(--accent);
  transform: translate(-50%, -50%) scale(1.06);
}

.tedx-card-content {
  padding: clamp(1.1rem, 2.4vw, 1.45rem);
}

.tedx-card-content h3 {
  margin-bottom: 0.45rem;
}

.tedx-card-content p:last-child {
  margin-bottom: 0;
}

@media (max-width: 900px) {
  .tedx-layout {
    grid-template-columns: 1fr;
  }

  .tedx-copy h2 {
    max-width: 16ch;
  }
}

body {
  margin: 0;
  font-family: "Aptos", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  transition: background 180ms ease, color 180ms ease;
  position: relative;
  isolation: isolate;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  pointer-events: none;
  z-index: -3;
  border-radius: 999px;
  filter: blur(110px);
  transform: translateZ(0);
}

body::before {
  width: min(44rem, 54vw);
  height: min(44rem, 54vw);
  top: 5rem;
  left: -10rem;
  background: radial-gradient(
          circle,
          rgba(0, 174, 239, 0.24) 0%,
          rgba(0, 174, 239, 0.12) 38%,
          rgba(0, 174, 239, 0) 74%
  );
  opacity: 0.9;
  animation: water-drift-left 18s ease-in-out infinite alternate;
}

body::after {
  width: min(50rem, 58vw);
  height: min(50rem, 58vw);
  top: 14rem;
  right: -12rem;
  background: radial-gradient(
          circle,
          rgba(89, 54, 255, 0.2) 0%,
          rgba(89, 54, 255, 0.1) 38%,
          rgba(89, 54, 255, 0) 76%
  );
  opacity: 0.86;
  animation: water-drift-right 22s ease-in-out infinite alternate;
}

body.dark-theme::before {
  background: radial-gradient(
          circle,
          rgba(0, 174, 239, 0.28) 0%,
          rgba(0, 174, 239, 0.14) 40%,
          rgba(0, 174, 239, 0) 74%
  );
}

body.dark-theme::after {
  background: radial-gradient(
          circle,
          rgba(89, 54, 255, 0.28) 0%,
          rgba(89, 54, 255, 0.14) 42%,
          rgba(89, 54, 255, 0) 76%
  );
}

@keyframes water-drift-left {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }

  to {
    transform: translate3d(2rem, 1.5rem, 0) scale(1.08);
  }
}

@keyframes water-drift-right {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }

  to {
    transform: translate3d(-2rem, 2rem, 0) scale(1.06);
  }
}

main {
  position: relative;
  z-index: 0;
}

main::before,
main::after {
  content: "";
  position: absolute;
  pointer-events: none;
  z-index: -2;
  border-radius: 999px;
  filter: blur(120px);
}

main::before {
  width: min(42rem, 50vw);
  height: min(42rem, 50vw);
  top: 34rem;
  left: -12rem;
  background: radial-gradient(
          circle,
          rgba(0, 174, 239, 0.16) 0%,
          rgba(0, 174, 239, 0.08) 40%,
          rgba(0, 174, 239, 0) 74%
  );
}

main::after {
  width: min(48rem, 54vw);
  height: min(48rem, 54vw);
  top: 76rem;
  right: -14rem;
  background: radial-gradient(
          circle,
          rgba(89, 54, 255, 0.14) 0%,
          rgba(89, 54, 255, 0.07) 42%,
          rgba(89, 54, 255, 0) 76%
  );
}

body.dark-theme main::before {
  background: radial-gradient(
          circle,
          rgba(0, 174, 239, 0.2) 0%,
          rgba(0, 174, 239, 0.1) 40%,
          rgba(0, 174, 239, 0) 74%
  );
}

body.dark-theme main::after {
  background: radial-gradient(
          circle,
          rgba(89, 54, 255, 0.22) 0%,
          rgba(89, 54, 255, 0.11) 42%,
          rgba(89, 54, 255, 0) 76%
  );
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--text);
  color: var(--bg);
  padding: 0.5rem 0.8rem;
  border-radius: 999px;
  z-index: 100;
}

.skip-link:focus {
  top: 1rem;
}

.site-header,
.site-footer {
  background: var(--surface-glass);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-footer {
  border-top: 1px solid var(--line);
  border-bottom: 0;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: calc(var(--header-base-padding) * var(--header-scale)) 0;
  transition: padding 80ms linear;
}

.footer-layout {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  flex-wrap: wrap;
}

.brand {
  text-decoration: none;
  color: var(--text);
  font-weight: 850;
  letter-spacing: -0.045em;
  font-size: calc(var(--header-base-brand-size) * var(--header-scale));
  transition: font-size 80ms linear, color 160ms ease;
}

nav {
  margin-left: auto;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.95rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-list a {
  position: relative;
  text-decoration: none;
  color: var(--muted);
  font-weight: 700;
  font-size: calc(var(--header-base-nav-size) * var(--header-scale));
  transition: font-size 80ms linear, color 160ms ease;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -0.35rem;
  width: 0;
  height: 0.16rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent));
  transform: translateX(-50%);
  transition: width 180ms ease;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--accent);
}

.nav-list a:hover::after,
.nav-list a:focus-visible::after {
  width: 70%;
}

.section {
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.hero {
  min-height: 62vh;
  display: grid;
  align-items: center;
  padding-top: clamp(2.5rem, 5vw, 4rem);
  padding-bottom: clamp(2.5rem, 5vw, 4rem);
}

.about-section {
  padding-top: clamp(2.5rem, 5vw, 4rem);
}

.hero-layout,
.contact-layout {
  display: grid;
  gap: clamp(1.4rem, 4vw, 3rem);
  grid-template-columns: 1.2fr 0.8fr;
  align-items: start;
}

.hero-copy {
  max-width: 720px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 850;
  color: var(--accent);
  margin-bottom: 1rem;
}

.lead {
  font-size: clamp(1.08rem, 2vw, 1.25rem);
  max-width: 62ch;
}

.hero-note,
.card,
#contact-form,
.challenge-grid li,
.service-card,
.mini-card {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* Liquid cursor glow */
.hero-note::after,
.card::after,
#contact-form::after,
.challenge-grid li::after,
.service-card::after,
.mini-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
          circle at var(--mx, 50%) var(--my, 50%),
          rgba(0, 174, 239, 0.16),
          transparent 12rem
  );
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
  z-index: 0;
}

.hero-note:hover::after,
.card:hover::after,
#contact-form:hover::after,
.challenge-grid li:hover::after,
.service-card:hover::after,
.mini-card:hover::after {
  opacity: 1;
}

.hero-note > *,
.card > *,
#contact-form > *,
.challenge-grid li > *,
.service-card > *,
.mini-card > * {
  position: relative;
  z-index: 1;
}

.hero-note,
.card {
  padding: clamp(1.1rem, 2vw, 1.45rem);
}

.hero-note {
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 60px var(--shadow);
  animation: liquid-float 7s ease-in-out infinite;
}

.hero-note::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
          radial-gradient(circle at top right, rgba(0, 174, 239, 0.18), transparent 11rem),
          radial-gradient(circle at bottom left, rgba(41, 24, 255, 0.12), transparent 12rem);
  pointer-events: none;
  z-index: 0;
}

.hero-note > * {
  position: relative;
  z-index: 1;
}

@keyframes liquid-float {
  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-8px);
  }
}

.liquid-mark {
  position: relative;
  width: 2.75rem;
  height: 3.5rem;
  margin-bottom: 1rem;
  flex: 0 0 auto;
  animation: liquid-mark-float 6s ease-in-out infinite;
  filter: drop-shadow(0 14px 28px rgba(41, 24, 255, 0.2));
}

.liquid-mark::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg%20viewBox%3D%270%200%2064%2080%27%20xmlns%3D%27http%3A//www.w3.org/2000/svg%27%3E%3Cdefs%3E%3ClinearGradient%20id%3D%27g%27%20x1%3D%2732%27%20y1%3D%273%27%20x2%3D%2732%27%20y2%3D%2777%27%20gradientUnits%3D%27userSpaceOnUse%27%3E%3Cstop%20stop-color%3D%27%235b3cff%27/%3E%3Cstop%20offset%3D%271%27%20stop-color%3D%27%232918ff%27/%3E%3C/linearGradient%3E%3Cfilter%20id%3D%27s%27%20x%3D%27-20%25%27%20y%3D%27-20%25%27%20width%3D%27140%25%27%20height%3D%27140%25%27%3E%3CfeDropShadow%20dx%3D%270%27%20dy%3D%274%27%20stdDeviation%3D%273%27%20flood-color%3D%27%232918ff%27%20flood-opacity%3D%270.24%27/%3E%3C/filter%3E%3C/defs%3E%3Cpath%20filter%3D%27url%28%23s%29%27%20fill%3D%27url%28%23g%29%27%20d%3D%27M32%203C23%2013%2010%2028%207%2044C4%2063%2017%2077%2032%2077C48%2077%2060%2064%2057%2045C54%2028%2041%2013%2032%203Z%27/%3E%3Cpath%20fill%3D%27%23ffffff%27%20fill-opacity%3D%270.1%27%20d%3D%27M32%208C24%2018%2014%2031%2012%2045C10%2058%2017%2069%2028%2073C17%2066%2012%2058%2014%2046C16%2033%2025%2020%2032%208Z%27/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
}

.liquid-mark::after {
  content: "";
  position: absolute;
  width: 0.42rem;
  height: 0.72rem;
  right: 0.82rem;
  bottom: 1.02rem;
  border-radius: 999px;
  background: rgba(0, 174, 239, 0.86);
  transform: rotate(18deg);
  z-index: 1;
  box-shadow: 0 0 8px rgba(0, 174, 239, 0.24);
}

@keyframes liquid-mark-float {
  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-5px);
  }
}

.narrow {
  max-width: 760px;
}

h1,
h2,
h3 {
  color: var(--text);
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin: 0 0 0.8rem;
}

h1 {
  font-size: clamp(2.45rem, 6vw, 4.9rem);
  max-width: 12ch;
}

h2 {
  font-size: clamp(1.85rem, 3vw, 2.85rem);
}

h3 {
  font-size: 1.3rem;
}

p {
  margin: 0 0 1rem;
  color: var(--muted);
}

a {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
.btn:focus-visible {
  outline: 3px solid rgba(0, 174, 239, 0.28);
  outline-offset: 3px;
}

button,
input,
textarea,
select,
.btn {
  font: inherit;
}

.btn,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.78rem 1.2rem;
  background: var(--accent-blue);
  color: #ffffff;
  cursor: pointer;
  text-decoration: none;
  font-weight: 800;
  background-clip: padding-box;
  -webkit-font-smoothing: antialiased;
  transform: translateZ(0);
  box-shadow:
          inset 0 1px 0 rgba(255, 255, 255, 0.22),
          0 10px 24px rgba(0, 174, 239, 0.18);
  transition:
          background 160ms ease,
          color 160ms ease,
          border-color 160ms ease,
          transform 160ms ease,
          box-shadow 160ms ease;
}

.btn:hover,
.btn:focus-visible,
button:hover,
button:focus-visible {
  background: var(--accent);
  box-shadow:
          inset 0 1px 0 rgba(255, 255, 255, 0.2),
          0 12px 28px rgba(41, 24, 255, 0.22);
}

.btn:active,
button:active {
  transform: translateY(1px);
}

.btn-secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--line);
  box-shadow: none;
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  color: var(--text);
  background: var(--surface-soft);
  box-shadow: none;
}

.theme-toggle {
  position: relative;
  width: 3.25rem;
  height: 1.75rem;
  flex: 0 0 auto;
  padding: 0;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--toggle-bg);
  cursor: pointer;
  overflow: hidden;
  background-clip: padding-box;
  box-shadow:
          inset 0 0 0 1px rgba(255, 255, 255, 0.18),
          0 0 0 3px rgba(0, 174, 239, 0.12);
  transform: translateZ(0);
  transition:
          background 180ms ease,
          border-color 180ms ease,
          box-shadow 180ms ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  background: var(--toggle-bg);
  border-color: rgba(0, 174, 239, 0.45);
  box-shadow:
          inset 0 0 0 1px rgba(255, 255, 255, 0.2),
          0 0 0 3px rgba(0, 174, 239, 0.18);
}

.theme-toggle::before {
  content: "";
  position: absolute;
  inset: 0.18rem;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
  opacity: 1;
  transition: opacity 180ms ease;
}

body.dark-theme .theme-toggle::before {
  opacity: 0;
}

.theme-toggle-thumb {
  position: absolute;
  top: 50%;
  left: calc(100% - 1.25rem - 0.25rem);
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--toggle-thumb);
  box-shadow: 0 3px 10px var(--shadow);
  transform: translateY(-50%);
  transition:
          left 180ms ease,
          background 180ms ease;
  z-index: 1;
}

body.dark-theme .theme-toggle-thumb {
  left: 0.25rem;
}

.theme-toggle,
.theme-toggle:hover,
.theme-toggle:focus-visible {
  padding: 0;
  color: inherit;
}

#primary-cta {
  background: #119dff;
  border-color: rgba(255, 255, 255, 0.16);
}

#primary-cta:hover,
#primary-cta:focus-visible {
  background: #2918ff;
}

.cta-row {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

/* About / profile section */

.about-layout {
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  align-items: start;
  gap: clamp(1.4rem, 4vw, 3rem);
}

.profile-card {
  padding: 0;
  box-shadow: 0 22px 64px var(--shadow);
}

.profile-image-wrap {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 340px;
  overflow: hidden;
  background:
          radial-gradient(circle at top left, rgba(0, 174, 239, 0.24), transparent 13rem),
          linear-gradient(135deg, rgba(17, 157, 255, 0.15), rgba(89, 54, 255, 0.15)),
          var(--surface-soft);
  border-bottom: 1px solid var(--line);
}

.profile-image-wrap img {
  width: 100%;
  height: 100%;
  min-height: 340px;
  object-fit: cover;
  display: block;
}

.profile-placeholder-text {
  display: none;
  color: var(--muted);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.profile-image-wrap.is-placeholder .profile-placeholder-text {
  display: inline-flex;
  padding: 0.8rem 1rem;
  border: 1px dashed var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
}

.profile-content {
  padding: clamp(1.1rem, 2.4vw, 1.55rem);
}

.profile-content h2 {
  font-size: clamp(1.7rem, 3vw, 2.35rem);
}

.profile-title {
  color: var(--text);
  font-weight: 800;
  margin-bottom: 1rem;
}

.profile-meta {
  list-style: none;
  padding: 0;
  margin: 0 0 1.2rem;
  display: grid;
  gap: 0.55rem;
}

.profile-meta li {
  position: relative;
  color: var(--muted);
  padding-left: 1.4rem;
}

.profile-meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
  box-shadow: 0 0 14px rgba(0, 174, 239, 0.24);
}

.about-copy {
  align-self: auto;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.mini-card {
  padding: 1rem;
}

.mini-card h3 {
  font-size: 1.08rem;
  margin-bottom: 0.5rem;
}

.mini-card p {
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* Challenges */

.challenge-grid {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 0.8rem;
}

.challenge-grid li {
  padding: 0.9rem 1rem;
  font-weight: 750;
  color: var(--text);
  background:
          linear-gradient(135deg, rgba(0, 174, 239, 0.08), rgba(41, 24, 255, 0.05)),
          var(--surface);
}

/* Forms */

#contact-form {
  display: grid;
  gap: 0.85rem;
  padding: clamp(1.1rem, 2vw, 1.4rem);
  box-shadow: 0 18px 50px var(--shadow);
}

label {
  font-weight: 750;
  color: var(--text);
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem 0.85rem;
  margin-top: 0.3rem;
  color: var(--text);
  background: var(--surface-soft);
  transition:
          border-color 160ms ease,
          outline-color 160ms ease,
          background 160ms ease;
}

input::placeholder,
textarea::placeholder {
  color: color-mix(in srgb, var(--muted) 78%, transparent);
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(0, 174, 239, 0.22);
  outline-offset: 1px;
  border-color: var(--accent-cyan);
}

.form-feedback {
  min-height: 1.2rem;
  margin: 0;
  font-weight: 750;
  color: var(--accent);
}

/* Services carousel */

.service-track {
  margin-top: clamp(2rem, 5vw, 3.5rem);
}

.service-copy {
  max-width: 920px;
}

.carousel {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.9rem;
  align-items: center;
  margin-top: 1rem;
}

.carousel-viewport {
  overflow: hidden;
  border-radius: var(--radius);
  padding: 0.6rem 0;
  mask-image: linear-gradient(
          90deg,
          transparent,
          black 8%,
          black 92%,
          transparent
  );
  -webkit-mask-image: linear-gradient(
          90deg,
          transparent,
          black 8%,
          black 92%,
          transparent
  );
}

.carousel-track {
  display: flex;
  gap: 1rem;
  transition: transform 320ms ease;
  will-change: transform;
  user-select: none;
}

.service-card {
  flex: 0 0 calc((100% - 4rem) / 5);
  padding: 1.05rem;
  min-height: 224px;
  transform-origin: center;
  transition:
          transform 220ms ease,
          opacity 220ms ease,
          filter 220ms ease,
          box-shadow 220ms ease,
          border-color 220ms ease;
}

.service-card p,
.service-card h4 {
  pointer-events: none;
}

.service-card h4 {
  margin: 0 0 0.65rem;
  line-height: 1.25;
  color: var(--text);
  letter-spacing: -0.02em;
}

.service-card.is-hidden-card {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: scale(0.91);
}

.service-card.is-preview {
  opacity: 0.45;
  filter: grayscale(0.18);
  transform: scale(0.92);
  cursor: pointer;
}

.service-card.is-preview:hover,
.service-card.is-preview:focus-visible {
  opacity: 0.72;
  transform: scale(0.95);
}

.service-card.is-active {
  opacity: 1;
  filter: none;
  box-shadow: 0 16px 36px var(--shadow);
}

.service-card.is-active:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 174, 239, 0.42);
}

.carousel-btn {
  width: 2.45rem;
  height: 2.45rem;
  border-radius: 50%;
  padding: 0;
  font-size: 1rem;
  background: var(--surface);
  color: var(--accent);
  border: 1px solid var(--line);
}

.carousel-btn:hover,
.carousel-btn:focus-visible {
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  color: #ffffff;
}

.carousel-btn:disabled {
  cursor: default;
  opacity: 0.45;
}

/* Published work */

.section-heading {
  max-width: 820px;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.publications-section {
  position: relative;
}

.publication-list {
  display: grid;
  gap: 0.75rem;
}

.publication-card-text-only {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(0.85rem, 2.2vw, 1.5rem);
  padding: clamp(0.85rem, 1.8vw, 1.15rem);
  min-height: auto;
  border-radius: 15px;
  background:
          radial-gradient(circle at 7% 20%, rgba(0, 174, 239, 0.1), transparent 10rem),
          radial-gradient(circle at 98% 80%, rgba(89, 54, 255, 0.08), transparent 12rem),
          var(--surface);
  transition:
          transform 180ms ease,
          border-color 180ms ease,
          box-shadow 180ms ease;
}

.publication-card-text-only:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 174, 239, 0.36);
  box-shadow: 0 12px 30px var(--shadow);
}

.publication-number {
  display: grid;
  place-items: center;
  width: 2.85rem;
  height: 2.85rem;
  border-radius: 0.9rem;
  color: #ffffff;
  font-size: 0.88rem;
  font-weight: 950;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
  box-shadow:
          inset 0 1px 0 rgba(255, 255, 255, 0.22),
          0 10px 22px rgba(0, 174, 239, 0.16);
}

.publication-content {
  padding: 0;
}

.publication-source {
  margin-bottom: 0.28rem;
  color: var(--accent);
  font-weight: 850;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
}

.publication-content h3 {
  max-width: 900px;
  margin-bottom: 0.38rem;
  font-size: clamp(1.12rem, 1.85vw, 1.55rem);
  line-height: 1.12;
  letter-spacing: -0.05em;
}

.publication-content p {
  max-width: 780px;
  margin-bottom: 0;
  font-size: 0.92rem;
  line-height: 1.45;
}

.publication-download {
  white-space: nowrap;
  align-self: center;
  font-size: 0.88rem;
}

.download-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  width: fit-content;
  margin-top: 0.2rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 850;
  border-bottom: 2px solid color-mix(in srgb, var(--accent-cyan) 55%, transparent);
  transition:
          color 160ms ease,
          border-color 160ms ease,
          transform 160ms ease;
}

.download-link:hover,
.download-link:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.section-note {
  margin-top: 1rem;
  font-size: 0.9rem;
}

code {
  padding: 0.08rem 0.32rem;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  background: var(--surface-soft);
  color: var(--text);
}

@media (max-width: 800px) {
  .publication-card-text-only {
    grid-template-columns: auto 1fr;
  }

  .publication-download {
    grid-column: 2;
    justify-self: start;
  }
}

@media (max-width: 540px) {
  .publication-card-text-only {
    grid-template-columns: 1fr;
  }

  .publication-number {
    width: 2.8rem;
    height: 2.8rem;
    border-radius: 0.85rem;
  }

  .publication-download {
    grid-column: auto;
  }
}

/* Policies */

.policy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.policy-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
}

.policy-icon {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 1rem;
  color: #ffffff;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent));
  box-shadow: 0 12px 28px rgba(0, 174, 239, 0.18);
}

.policy-card h3 {
  font-size: 1.12rem;
}

/* Scroll reveal */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  filter: blur(6px);
  transition:
          opacity 600ms ease,
          transform 600ms ease,
          filter 600ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

/* Social */

.social-section {
  margin-top: 1.6rem;
}

.social-section h3 {
  font-size: 1.15rem;
  margin-bottom: 0.85rem;
}

.social-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.social-link {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-weight: 850;
  transition:
          transform 160ms ease,
          border-color 160ms ease,
          background 160ms ease,
          box-shadow 160ms ease;
}

.social-link::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
          circle at var(--mx, 50%) var(--my, 50%),
          rgba(0, 174, 239, 0.16),
          transparent 10rem
  );
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.social-link:hover,
.social-link:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(0, 174, 239, 0.42);
  box-shadow: 0 14px 32px var(--shadow);
}

.social-link:hover::after,
.social-link:focus-visible::after {
  opacity: 1;
}

.social-link img {
  width: 1.55rem;
  height: 1.55rem;
  object-fit: contain;
  flex: 0 0 auto;
}

.social-link span {
  position: relative;
  z-index: 1;
}

/* Sticky quick footer */

.site-footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 18;
  transform-origin: bottom center;
  box-shadow: 0 -14px 40px var(--shadow);
}

.footer-layout {
  padding: calc(var(--footer-base-padding) * var(--footer-scale)) 0;
  transition: padding 80ms linear;
}

.footer-social-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  margin-left: 0;
}

.footer-social-link {
  display: grid;
  place-items: center;
  width: calc(var(--footer-base-icon-size) * var(--footer-scale));
  height: calc(var(--footer-base-icon-size) * var(--footer-scale));
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  text-decoration: none;
  transition:
          width 80ms linear,
          height 80ms linear,
          transform 160ms ease,
          border-color 160ms ease,
          background 160ms ease;
}

.footer-social-link:hover,
.footer-social-link:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(0, 174, 239, 0.45);
  background: var(--surface-soft);
}

.footer-social-link img {
  width: calc(1.25rem * var(--footer-scale));
  height: calc(1.25rem * var(--footer-scale));
  object-fit: contain;
  transition:
          width 80ms linear,
          height 80ms linear;
}

/* Prevent the fixed footer covering the end of the page */

body {
  padding-bottom: 5.5rem;
}

/* Responsive */

@media (max-width: 1080px) {
  .policy-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 980px) {
  .service-card {
    flex-basis: calc((100% - 3rem) / 4);
    min-height: 238px;
  }

  .about-layout {
    grid-template-columns: 1fr;
  }

  .profile-card {
    display: grid;
    grid-template-columns: minmax(220px, 0.8fr) 1fr;
  }

  .profile-image-wrap,
  .profile-image-wrap img {
    min-height: 100%;
  }

  .about-highlights {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 800px) {
  .site-header .container,
  .site-footer .container {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.7rem;
  }

  .footer-layout {
    align-items: center;
  }

  .footer-social-nav {
    order: -1;
  }

  nav {
    margin-left: 0;
  }

  .nav-list {
    justify-content: flex-start;
    padding-right: 4.4rem;
  }

  .theme-toggle {
    position: absolute;
    top: 0.8rem;
    right: 4vw;
  }

  .hero-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 4.4rem;
  }

  .publication-card {
    grid-template-columns: 1fr;
  }

  .publication-media {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 760px) {
  .carousel {
    gap: 0.45rem;
  }

  .service-card {
    flex-basis: calc((100% - 2rem) / 3);
    min-height: 248px;
  }

  .carousel-btn {
    width: 2.2rem;
    height: 2.2rem;
  }

  .profile-card {
    display: block;
  }

  .profile-image-wrap,
  .profile-image-wrap img {
    min-height: 320px;
  }
}

@media (max-width: 540px) {
  .section {
    padding: 3.5rem 0;
  }

  .nav-list {
    gap: 0.65rem;
  }

  .social-links {
    grid-template-columns: 1fr;
  }

  body {
    padding-bottom: 7rem;
  }

  .footer-layout {
    gap: 0.45rem;
  }

  .footer-social-nav {
    width: 100%;
    justify-content: flex-start;
  }

  .service-card {
    flex-basis: 82%;
    min-height: auto;
  }

  .policy-card {
    grid-template-columns: 1fr;
  }

  .publication-content {
    padding: 1.1rem;
  }

  .publication-media {
    min-height: 190px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  body::before,
  body::after,
  .hero-note,
  .liquid-mark {
    animation: none !important;
  }

  .reveal {
    opacity: 0;
    transform: translateY(5px);
    filter: blur(1px);
    transition:
            opacity 30ms ease,
            transform 30ms ease,
            filter 30ms ease;
    will-change: opacity, transform, filter;
  }
}