:root {
  --background: #030814;
  --background-soft: rgba(12, 20, 43, 0.78);
  --text: #edf6ff;
  --muted: #a9b9d6;
  --accent: #78f0d0;
  --accent-soft: #7aa7ff;
  --accent-purple: #9b7cff;
  --accent-green: #82f7ae;
  --hero-photo: url("images/profile-photo.png");
  --border: rgba(139, 167, 255, 0.22);
  --shadow: rgba(0, 0, 0, 0.42);
  --max-width: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 14%, rgba(120, 240, 208, 0.12), transparent 18rem),
    radial-gradient(circle at 20% 18%, rgba(122, 167, 255, 0.10), transparent 24rem),
    radial-gradient(circle at 82% 8%, rgba(155, 124, 255, 0.22), transparent 22rem),
    radial-gradient(circle at 50% 42%, rgba(40, 91, 184, 0.18), transparent 28rem),
    radial-gradient(circle at 78% 82%, rgba(130, 247, 174, 0.12), transparent 22rem),
    linear-gradient(135deg, #030814 0%, #071225 42%, #130b2d 72%, #051524 100%);
  line-height: 1.6;
  overflow-x: hidden;
}


body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 12% 24%, rgba(122, 167, 255, 0.08), transparent 14rem),
    radial-gradient(circle at 88% 20%, rgba(120, 240, 208, 0.06), transparent 18rem),
    radial-gradient(circle at 58% 70%, rgba(155, 124, 255, 0.06), transparent 20rem),
    linear-gradient(120deg, transparent 0%, rgba(122, 167, 255, 0.035) 38%, transparent 58%),
    linear-gradient(300deg, transparent 8%, rgba(120, 240, 208, 0.03) 48%, transparent 72%);
  opacity: 1;
  filter: blur(8px);
}

body::after {
  content: "";
  position: fixed;
  inset: auto -10% -35% -10%;
  height: 58vh;
  pointer-events: none;
  background: radial-gradient(ellipse at center, rgba(120, 240, 208, 0.13), transparent 65%);
  filter: blur(18px);
}

a {
  color: inherit;
}

.site-header {
  width: min(90%, var(--max-width));
  margin: 0 auto;
  padding: 1.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 2;
}

.logo {
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: lowercase;
}

.nav-links {
  display: flex;
  gap: 1.4rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
  transition: color 0.2s ease, text-shadow 0.2s ease;
}

.nav-links a:hover {
  color: var(--accent);
  text-shadow: 0 0 18px rgba(120, 240, 208, 0.52);
}

.menu-toggle {
  display: none;
  border: 0;
  background: transparent;
  color: var(--text);
  font-size: 1.7rem;
  cursor: pointer;
}

.hero {
  width: min(90%, var(--max-width));
  min-height: 78vh;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 3rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-content::before {
  content: "";
  position: absolute;
  width: min(40rem, 78vw);
  height: min(40rem, 78vw);
  left: -10rem;
  top: -8rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(122, 167, 255, 0.14) 0%, rgba(122, 167, 255, 0.07) 34%, rgba(120, 240, 208, 0.04) 52%, transparent 72%);
  filter: blur(18px);
  opacity: 0.58;
  pointer-events: none;
  z-index: -1;
}

.eyebrow,
.section-label,
.card-label {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: lowercase;
  text-shadow: 0 0 18px rgba(120, 240, 208, 0.38);
}

.hero h1 {
  margin-top: 0.9rem;
  max-width: 850px;
  font-size: clamp(2.8rem, 7vw, 5.8rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
  background: linear-gradient(115deg, #ffffff 5%, #a9c8ff 38%, #b29aff 66%, #78f0d0 95%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 46px rgba(122, 167, 255, 0.12);
}

.hero-description {
  max-width: 680px;
  margin-top: 1.4rem;
  color: var(--muted);
  font-size: 1.12rem;
}

.button-row {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.75rem 1.15rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 800;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

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

.primary-button {
  background: linear-gradient(135deg, #78f0d0, #7aa7ff 48%, #9b7cff);
  color: #030814;
  box-shadow: 0 16px 38px rgba(88, 139, 255, 0.28);
}

.primary-button:hover {
  background: linear-gradient(135deg, #82f7ae, #78f0d0 42%, #9b7cff);
  box-shadow: 0 20px 48px rgba(120, 240, 208, 0.28);
}

.secondary-button {
  border: 1px solid rgba(120, 240, 208, 0.34);
  color: var(--text);
  background: rgba(7, 18, 37, 0.56);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.secondary-button:hover {
  background: rgba(120, 240, 208, 0.12);
  border-color: rgba(120, 240, 208, 0.62);
  box-shadow: 0 14px 34px rgba(120, 240, 208, 0.12);
}

.hero-card,
.project-card,
.timeline,
.research-list > div {
  background: var(--background-soft);
  border: 1px solid var(--border);
  box-shadow: 0 22px 70px var(--shadow), 0 0 0 1px rgba(122, 167, 255, 0.04), inset 0 1px 0 rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(18px);
}

.hero-card {
  min-height: 420px;
  border-radius: 2rem;
  padding: 0;
  overflow: hidden;
  position: relative;
  background-image:
    linear-gradient(to top, rgba(3, 8, 20, 0.12), rgba(3, 8, 20, 0.04)),
    var(--hero-photo);
  background-size: cover;
  background-position: center 18%;
  background-repeat: no-repeat;
}

.hero-card > * {
  display: none;
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, rgba(3, 8, 20, 0.32), transparent 46%),
    radial-gradient(circle at top right, rgba(120, 240, 208, 0.12), transparent 12rem);
}

.section {
  width: min(90%, var(--max-width));
  margin: 0 auto;
  padding: 6rem 0;
  position: relative;
  z-index: 1;
}

.section-grid {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 3rem;
  align-items: start;
}

.section h2,
.section-heading h2,
.contact-section h2 {
  margin-top: 0.8rem;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

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

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  align-items: end;
}

.section-heading p {
  max-width: 430px;
}

.skills {
  margin-top: 1.7rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.skills span,
.project-tags span {
  display: inline-flex;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  color: #bfffee;
  background: rgba(120, 240, 208, 0.1);
  border: 1px solid rgba(120, 240, 208, 0.18);
  font-size: 0.82rem;
  font-weight: 800;
}

.project-grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.1rem;
}

.project-card {
  min-height: 285px;
  border-radius: 1.6rem;
  padding: 1.45rem;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  background:
    linear-gradient(155deg, rgba(13, 28, 59, 0.84), rgba(21, 13, 50, 0.78)),
    radial-gradient(circle at top right, rgba(122, 167, 255, 0.18), transparent 12rem) !important;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(120, 240, 208, 0.46);
  box-shadow: 0 28px 70px rgba(61, 91, 181, 0.34), 0 0 34px rgba(120, 240, 208, 0.08);
  background:
    radial-gradient(circle at top right, rgba(120, 240, 208, 0.16), transparent 12rem),
    linear-gradient(155deg, rgba(12, 35, 58, 0.92), rgba(36, 20, 76, 0.84)) !important;
}

.project-number {
  color: var(--accent);
  font-weight: 900;
  font-size: 0.85rem;
}

.project-card h3 {
  margin-top: 1.2rem;
  font-size: 1.25rem;
}

.project-card p {
  margin-top: 0.8rem;
  font-size: 0.95rem;
}

.project-tags {
  margin-top: auto;
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.research-list {
  display: grid;
  gap: 1rem;
}

.research-list > div {
  border-radius: 1.3rem;
  padding: 1.4rem;
  background:
    linear-gradient(145deg, rgba(12, 20, 43, 0.82), rgba(7, 18, 37, 0.68)),
    radial-gradient(circle at 92% 0%, rgba(130, 247, 174, 0.12), transparent 12rem);
}

.research-list h3 {
  margin-bottom: 0.35rem;
}

.timeline {
  margin-top: 2rem;
  border-radius: 1.6rem;
  padding: 0.5rem;
  background: rgba(12, 20, 43, 0.7);
}

.timeline-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.4rem;
  padding: 1.4rem;
  border-bottom: 1px solid rgba(122, 167, 255, 0.14);
}

.timeline-item:last-child {
  border-bottom: 0;
}

.timeline-date {
  color: var(--accent) !important;
  font-weight: 900;
}

.contact-section {
  text-align: center;
  max-width: 760px;
}

.contact-section .button-row {
  justify-content: center;
}

.site-footer {
  width: min(90%, var(--max-width));
  margin: 0 auto;
  padding: 2rem 0;
  color: var(--muted);
  font-size: 0.9rem;
  position: relative;
  z-index: 1;
}

@media (max-width: 950px) {
  .hero,
  .section-grid {
    grid-template-columns: 1fr;
  }

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

  .section-heading {
    display: block;
  }

  .section-heading p {
    margin-top: 0.8rem;
  }
}

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
  }

  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 4.7rem;
    left: 5%;
    right: 5%;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 1rem;
    border-radius: 1.2rem;
    background: rgba(7, 18, 37, 0.96);
    border: 1px solid rgba(120, 240, 208, 0.22);
    box-shadow: 0 18px 50px var(--shadow);
    backdrop-filter: blur(18px);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    padding: 0.75rem;
  }

  .hero {
    padding-top: 2rem;
  }

  .hero-card {
    min-height: 360px;
  }

  .hero-content::before {
    left: -5rem;
    top: -4rem;
    width: min(30rem, 88vw);
    height: min(30rem, 88vw);
  }

  .project-grid {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .section {
    padding: 4.2rem 0;
  }
}