:root {
  --background: #05070c;
  --background-soft: #080d16;
  --panel: rgba(13, 20, 33, 0.84);
  --panel-strong: #0c1422;
  --text: #f7f9fc;
  --text-muted: #aab6c8;
  --text-soft: #7e8ba0;
  --blue: #4e8dff;
  --blue-bright: #71a9ff;
  --blue-deep: #1d4ed8;
  --line: rgba(145, 174, 218, 0.18);
  --line-strong: rgba(92, 144, 230, 0.42);
  --container: 1180px;
  --header-height: 82px;
  --radius: 22px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--background);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at 78% 5%, rgba(35, 91, 184, 0.18), transparent 25rem),
    radial-gradient(circle at 8% 38%, rgba(20, 52, 105, 0.15), transparent 27rem),
    var(--background);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  opacity: 0.58;
  background-image:
    radial-gradient(circle at 14% 18%, rgba(255,255,255,0.55) 0 0.7px, transparent 0.9px),
    radial-gradient(circle at 39% 72%, rgba(122,169,255,0.5) 0 0.8px, transparent 1px),
    radial-gradient(circle at 82% 35%, rgba(255,255,255,0.42) 0 0.7px, transparent 0.9px),
    radial-gradient(circle at 67% 88%, rgba(255,255,255,0.35) 0 0.6px, transparent 0.8px);
  background-size: 280px 280px, 390px 390px, 330px 330px, 460px 460px;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(rgba(255,255,255,0.012) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.012) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, black, transparent 75%);
}

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

a {
  color: inherit;
}

button,
input,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

::selection {
  color: white;
  background: rgba(78, 141, 255, 0.65);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 9999;
  padding: 10px 14px;
  color: white;
  background: var(--blue-deep);
  border-radius: 8px;
  transform: translateY(-160%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 48px), var(--container));
  margin-inline: auto;
}

.section {
  position: relative;
  padding: 120px 0;
  scroll-margin-top: var(--header-height);
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  height: var(--header-height);
  border-bottom: 1px solid transparent;
  transition: background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.site-header.scrolled {
  background: rgba(5, 7, 12, 0.82);
  border-color: var(--line);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(18px);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}

.brand img {
  width: clamp(220px, 25vw, 315px);
  height: auto;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: clamp(20px, 2.6vw, 38px);
}

.primary-nav a {
  position: relative;
  color: #c8d2e1;
  font-size: 0.88rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: color 180ms ease;
}

.primary-nav a:not(.nav-contact)::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -8px;
  left: 0;
  height: 1px;
  background: var(--blue-bright);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

.primary-nav a:hover,
.primary-nav a:focus-visible,
.primary-nav a.active {
  color: white;
}

.primary-nav a:not(.nav-contact):hover::after,
.primary-nav a:not(.nav-contact):focus-visible::after,
.primary-nav a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-contact {
  padding: 9px 17px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(78, 141, 255, 0.08);
}

.nav-contact:hover,
.nav-contact:focus-visible {
  border-color: var(--blue-bright);
  background: rgba(78, 141, 255, 0.16);
}

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255,255,255,0.025);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 5px 0;
  background: white;
  border-radius: 999px;
  transition: transform 180ms ease, opacity 180ms ease;
}

.hero {
  min-height: 100svh;
  padding-top: calc(var(--header-height) + 96px);
  display: grid;
  align-items: center;
}

.hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.22fr) minmax(330px, 0.78fr);
  gap: clamp(70px, 8vw, 130px);
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 790px;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--blue-bright);
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0.18em;
  line-height: 1.4;
  text-transform: uppercase;
}

.hero h1,
.section-heading h2,
.contact-copy h2 {
  margin: 0;
  font-weight: 680;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

.hero h1 {
  max-width: 830px;
  font-size: clamp(3.3rem, 7vw, 6.8rem);
}

.hero-description {
  max-width: 690px;
  margin: 30px 0 0;
  color: var(--text-muted);
  font-size: clamp(1.05rem, 1.6vw, 1.28rem);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-weight: 720;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  color: white;
  background: linear-gradient(135deg, #3a79e8, #2359c8);
  box-shadow: 0 14px 35px rgba(30, 92, 211, 0.28);
}

.button-primary:hover,
.button-primary:focus-visible {
  box-shadow: 0 18px 44px rgba(30, 92, 211, 0.42);
}

.button-secondary {
  color: white;
  border-color: var(--line-strong);
  background: rgba(255,255,255,0.025);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: var(--blue-bright);
  background: rgba(78, 141, 255, 0.08);
}

.hero-status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 34px;
  color: var(--text-soft);
  font-size: 0.83rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blue-bright);
  box-shadow: 0 0 0 6px rgba(78, 141, 255, 0.09), 0 0 20px rgba(78, 141, 255, 0.7);
}

.hero-visual {
  position: relative;
  min-height: 520px;
  display: grid;
  place-items: center;
}

.hero-glow {
  position: absolute;
  top: 11%;
  right: -15%;
  width: min(52vw, 760px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(50, 114, 226, 0.12), rgba(23, 58, 117, 0.04) 42%, transparent 70%);
  filter: blur(10px);
  pointer-events: none;
}

.orbital-mark {
  position: relative;
  width: min(34vw, 440px);
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 40% 35%, rgba(111, 166, 255, 0.27), transparent 24%),
    radial-gradient(circle, rgba(34, 87, 177, 0.17), rgba(4, 10, 20, 0.12) 56%, transparent 57%);
  box-shadow: inset 0 0 90px rgba(41, 111, 230, 0.08), 0 0 100px rgba(24, 73, 155, 0.15);
}

.orbital-mark::before,
.orbital-mark::after {
  content: "";
  position: absolute;
  inset: 20%;
  border: 1px solid rgba(114, 164, 249, 0.2);
  border-radius: 50%;
}

.orbital-mark::after {
  inset: 34%;
  border-color: rgba(114, 164, 249, 0.13);
}

.orbit {
  position: absolute;
  inset: 12%;
  border: 1px solid rgba(121, 174, 255, 0.4);
  border-radius: 50%;
  transform: rotate(22deg) scaleY(0.42);
}

.orbit-two {
  inset: 5%;
  border-color: rgba(121, 174, 255, 0.25);
  transform: rotate(-42deg) scaleY(0.3);
}

.orbit-three {
  inset: 18%;
  border-color: rgba(255,255,255,0.13);
  transform: rotate(72deg) scaleY(0.58);
}

.core {
  position: absolute;
  inset: 43%;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 29%, white, #6fa8ff 18%, #2d68cc 46%, #0d1f44 100%);
  box-shadow: 0 0 28px rgba(88, 151, 255, 0.65), 0 0 80px rgba(42, 97, 190, 0.45);
}

.satellite {
  position: absolute;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #eaf2ff;
  box-shadow: 0 0 16px #74adff;
}

.satellite-one {
  top: 25%;
  right: 14%;
}

.satellite-two {
  bottom: 18%;
  left: 19%;
  width: 6px;
  height: 6px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 54px;
}

.section-heading h2,
.contact-copy h2 {
  font-size: clamp(2.3rem, 4.8vw, 4.5rem);
}

.section-heading > p:last-child,
.contact-copy > p:not(.eyebrow):not(.contact-note) {
  max-width: 690px;
  margin: 24px 0 0;
  color: var(--text-muted);
  font-size: 1.06rem;
}

.research-section {
  background: linear-gradient(180deg, rgba(8, 13, 22, 0.1), rgba(8, 13, 22, 0.75) 45%, rgba(8, 13, 22, 0.25));
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.research-card {
  position: relative;
  min-height: 300px;
  padding: 34px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(17, 27, 45, 0.82), rgba(9, 15, 25, 0.74));
  box-shadow: var(--shadow);
  transition: transform 220ms ease, border-color 220ms ease, background 220ms ease;
}

.research-card::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 190px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(68, 133, 247, 0.13), transparent 68%);
}

.research-card:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  background: linear-gradient(145deg, rgba(20, 33, 55, 0.88), rgba(9, 15, 25, 0.8));
}

.card-index {
  position: absolute;
  top: 28px;
  right: 30px;
  color: rgba(153, 184, 233, 0.4);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.14em;
}

.card-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  margin-bottom: 34px;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: rgba(53, 111, 215, 0.08);
}

.card-icon svg {
  width: 25px;
  fill: none;
  stroke: var(--blue-bright);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.research-card h3 {
  margin: 0;
  font-size: 1.42rem;
  letter-spacing: -0.025em;
}

.research-card p {
  max-width: 520px;
  margin: 15px 0 0;
  color: var(--text-muted);
}

.team-section {
  overflow: hidden;
}

.team-section::before {
  content: "";
  position: absolute;
  top: 20%;
  left: -18rem;
  width: 34rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(32, 88, 186, 0.12), transparent 70%);
  pointer-events: none;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.team-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(12, 20, 34, 0.72);
  box-shadow: var(--shadow);
  transition: transform 220ms ease, border-color 220ms ease;
}

.team-card:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
}

.team-photo-wrap {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: #171b22;
}

.team-photo-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(4, 8, 14, 0.28), transparent 38%);
  pointer-events: none;
}

.team-photo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 28%;
  filter: saturate(0.9) contrast(1.02);
  transition: transform 500ms cubic-bezier(.2,.8,.2,1), filter 300ms ease;
}

.team-card:hover img {
  transform: scale(1.025);
  filter: saturate(1) contrast(1.03);
}

.team-photo-wrap img.alexander-photo {
  object-position: center center;
}

.team-card-body {
  min-height: 132px;
  padding: 24px 25px 26px;
}

.team-card h3 {
  margin: 0;
  font-size: 1.24rem;
  letter-spacing: -0.025em;
}

.team-card p {
  margin: 8px 0 0;
  color: var(--blue-bright);
  font-size: 0.91rem;
  line-height: 1.5;
}

.publications-section {
  background: linear-gradient(180deg, rgba(7, 12, 20, 0.2), rgba(11, 18, 31, 0.78), rgba(7, 12, 20, 0.18));
}

.publications-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(400px, 1.1fr);
  gap: clamp(50px, 8vw, 110px);
  align-items: center;
}

.publications-layout .section-heading {
  margin: 0;
}

.publication-panel {
  position: relative;
  padding: clamp(32px, 5vw, 54px);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(18, 31, 52, 0.9), rgba(9, 15, 25, 0.86));
  box-shadow: var(--shadow);
}

.publication-panel::after {
  content: "";
  position: absolute;
  top: -9rem;
  right: -8rem;
  width: 19rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 127, 246, 0.18), transparent 68%);
}

.publication-status {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--blue-bright);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.publication-line {
  width: 58px;
  height: 1px;
  background: var(--blue-bright);
  opacity: 0.55;
}

.publication-panel h3 {
  max-width: 500px;
  margin: 30px 0 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
  letter-spacing: -0.045em;
  line-height: 1.05;
}

.publication-panel > p {
  max-width: 610px;
  margin: 24px 0 0;
  color: var(--text-muted);
}

.publication-meta {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--text-soft);
  font-size: 0.82rem;
}

.contact-section {
  padding-bottom: 130px;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(440px, 1.2fr);
  gap: clamp(50px, 9vw, 120px);
  align-items: start;
}

.contact-copy {
  position: sticky;
  top: calc(var(--header-height) + 42px);
}

.contact-note {
  max-width: 580px;
  margin-top: 24px;
  padding-left: 16px;
  border-left: 2px solid var(--blue-deep);
  color: var(--text-soft);
  font-size: 0.86rem;
}

.contact-form {
  display: grid;
  gap: 22px;
  padding: clamp(28px, 5vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(12, 20, 34, 0.72);
  box-shadow: var(--shadow);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.contact-form label {
  display: grid;
  gap: 9px;
  color: #d8e0ec;
  font-size: 0.84rem;
  font-weight: 700;
}

.contact-form label span {
  color: var(--text-soft);
  font-weight: 500;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  color: white;
  border: 1px solid var(--line);
  border-radius: 11px;
  outline: none;
  background: rgba(3, 7, 13, 0.52);
  transition: border-color 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.contact-form input {
  height: 48px;
  padding: 0 14px;
}

.contact-form textarea {
  min-height: 150px;
  padding: 13px 14px;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--blue-bright);
  background: rgba(5, 11, 21, 0.72);
  box-shadow: 0 0 0 4px rgba(78, 141, 255, 0.1);
}

.submit-button {
  justify-self: start;
  min-width: 150px;
  margin-top: 4px;
  cursor: pointer;
}

.hidden-field {
  position: absolute;
  left: -9999px;
}

.site-footer {
  padding: 34px 0;
  border-top: 1px solid var(--line);
  background: rgba(3, 5, 9, 0.7);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 28px;
}

.footer-brand img {
  width: 190px;
}

.footer-inner p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.78rem;
}

.footer-inner p:last-child {
  justify-self: end;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 650ms ease, transform 650ms cubic-bezier(.2,.8,.2,1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  :root {
    --header-height: 74px;
  }

  .container {
    width: min(calc(100% - 38px), var(--container));
  }

  .nav-toggle {
    display: block;
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .primary-nav {
    position: fixed;
    top: var(--header-height);
    right: 18px;
    left: 18px;
    display: grid;
    gap: 4px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: rgba(7, 11, 18, 0.97);
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .primary-nav.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .primary-nav a {
    padding: 13px 14px;
    border-radius: 10px;
  }

  .primary-nav a::after {
    display: none;
  }

  .nav-contact {
    border-color: transparent;
    background: rgba(78, 141, 255, 0.1);
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--header-height) + 100px);
    padding-bottom: 110px;
  }

  .hero-visual {
    position: absolute;
    top: 17%;
    right: -20%;
    min-height: 0;
    opacity: 0.36;
    pointer-events: none;
  }

  .orbital-mark {
    width: 440px;
  }

  .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .contact-copy {
    position: static;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }

  .footer-inner > p:nth-child(2) {
    display: none;
  }
}

@media (max-width: 680px) {
  .container {
    width: min(calc(100% - 30px), var(--container));
  }

  .section {
    padding: 88px 0;
  }

  .brand img {
    width: 216px;
  }

  .hero {
    padding-top: calc(var(--header-height) + 88px);
    padding-bottom: 94px;
  }

  .hero h1 {
    font-size: clamp(2.8rem, 15vw, 4.5rem);
  }

  .hero-description {
    margin-top: 24px;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .hero-status {
    align-items: flex-start;
  }

  .status-dot {
    flex: 0 0 auto;
    margin-top: 7px;
  }

  .hero-visual {
    right: -70%;
    opacity: 0.27;
  }

  .research-grid,
  .team-grid,
  .form-row {
    grid-template-columns: 1fr;
  }

  .research-card {
    min-height: 0;
    padding: 28px;
  }

  .team-card-body {
    min-height: 0;
  }

  .publications-layout {
    gap: 42px;
  }

  .publication-meta {
    flex-direction: column;
    gap: 5px;
  }

  .contact-form {
    padding: 25px;
  }

  .submit-button {
    justify-self: stretch;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .footer-inner p:last-child {
    justify-self: start;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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