:root {
  --bg: #070d14;
  --bg-soft: #0b121c;
  --bg-grid: rgba(95, 113, 136, 0.1);
  --surface: rgba(11, 20, 31, 0.56);
  --surface-soft: rgba(14, 24, 37, 0.66);
  --text: #d3dceb;
  --muted: #8b9db5;
  --line: rgba(114, 130, 152, 0.24);
  --line-strong: rgba(114, 130, 152, 0.34);
  --accent: #7792af;
  --accent-2: #5d7691;
  --shadow: 0 22px 40px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Manrope", sans-serif;
  background:
    radial-gradient(1500px 820px at 80% -12%, rgba(101, 124, 152, 0.18), transparent 62%),
    radial-gradient(980px 680px at -8% 28%, rgba(78, 97, 122, 0.13), transparent 66%),
    linear-gradient(180deg, var(--bg), var(--bg-soft));
}

.grid-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.17;
}

#pointcloud-bg {
  position: fixed;
  inset: 0;
  z-index: 1;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  opacity: 0.58;
}

.topbar,
main,
.footer {
  position: relative;
  z-index: 2;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.95rem clamp(1rem, 3vw, 2.3rem);
  border-bottom: 1px solid var(--line);
  background: rgba(8, 13, 21, 0.72);
  backdrop-filter: blur(9px);
}

.brand {
  text-decoration: none;
  color: var(--accent);
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.84rem;
  padding: 0.4rem 0.62rem;
  border-radius: 999px;
  transition: 0.2s ease;
}

.nav a:hover,
.nav a.is-active {
  color: var(--text);
  background: rgba(119, 146, 175, 0.14);
}

main {
  width: min(1220px, 94vw);
  margin: 0 auto;
  padding: 1.1rem 0 3.7rem;
}

.section {
  margin-top: 1.1rem;
}

.hero {
  display: block;
}

.hero-copy,
.skill-card,
.project-card,
.contact-card,
.timeline li {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(5px);
}

.hero-copy {
  padding: clamp(1rem, 2.4vw, 1.9rem);
  max-width: 860px;
}

.eyebrow {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

h1,
h2,
h3,
strong {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  line-height: 1.1;
}

h1 {
  margin-top: 0.75rem;
  font-size: clamp(2.4rem, 6vw, 4.3rem);
  max-width: 9ch;
}

.lead {
  margin: 0.85rem 0 0;
  color: var(--muted);
  line-height: 1.55;
  font-size: 1.03rem;
  max-width: 53ch;
}

.hero-actions {
  margin-top: 1.1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.btn {
  text-decoration: none;
  border-radius: 0.65rem;
  padding: 0.58rem 0.88rem;
  font-size: 0.84rem;
  font-weight: 700;
  border: 1px solid var(--line-strong);
}

.btn-primary {
  background: rgba(119, 146, 175, 0.24);
  color: var(--text);
}

.btn-secondary {
  background: rgba(18, 31, 47, 0.62);
  color: var(--text);
}

.hero-meta {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.hero-meta li {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  padding: 0.38rem 0.55rem;
  color: var(--muted);
  font-size: 0.78rem;
  background: var(--surface-soft);
}

.bg-controls {
  margin-top: 0.95rem;
  border-top: 1px dashed var(--line);
  padding-top: 0.75rem;
}

.bg-controls > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.74rem;
}

.shape-controls {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 0.55rem;
}

.shape-btn {
  border: 1px solid var(--line-strong);
  background: rgba(16, 26, 39, 0.74);
  color: #98abc2;
  border-radius: 999px;
  padding: 0.24rem 0.46rem;
  font-size: 0.72rem;
  font-family: "Space Grotesk", sans-serif;
  cursor: pointer;
}

.shape-btn.is-active {
  color: #d8e2ef;
  background: rgba(110, 134, 161, 0.34);
  border-color: rgba(122, 145, 171, 0.6);
  font-weight: 700;
}

.lab-foot {
  margin-top: 0.55rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.lab-foot span {
  color: #aabdd3;
  font-size: 0.72rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  padding: 0.26rem 0.45rem;
  background: rgba(17, 28, 42, 0.68);
}

.section-title {
  margin: 0.38rem 0 0;
  font-size: clamp(2rem, 4.4vw, 3.6rem);
}

.split-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.column-title {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.74rem;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.timeline {
  list-style: none;
  margin: 0.78rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.62rem;
}

.timeline li {
  padding: 0.82rem;
}

.time {
  margin: 0;
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.timeline h3 {
  margin-top: 0.33rem;
  font-size: 1.12rem;
}

.loc {
  margin: 0.3rem 0 0;
  color: #7e95b1;
  font-size: 0.86rem;
}

.timeline p {
  margin: 0.42rem 0 0;
  color: var(--muted);
  line-height: 1.52;
  font-size: 0.88rem;
}

.timeline a {
  color: var(--accent);
  text-decoration: none;
}

.skill-grid {
  margin-top: 0.95rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.skill-card {
  padding: 0.84rem;
  --rx: 0deg;
  --ry: 0deg;
  transform: perspective(900px) rotateX(var(--rx)) rotateY(var(--ry));
  transform-style: preserve-3d;
  transition: transform 0.16s ease, border-color 0.2s ease;
}

.skill-card h3 {
  font-size: 0.94rem;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.skill-card p {
  margin: 0.48rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.47;
}

.skill-card ul {
  margin: 0.68rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.skill-card li {
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  padding: 0.25rem 0.46rem;
  font-size: 0.73rem;
  color: #9bb0c8;
  background: rgba(17, 31, 46, 0.7);
}

.section-note {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.project-controls {
  margin-top: 0.82rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.filter {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(16, 27, 40, 0.74);
  color: #8b9fb8;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.55rem;
  cursor: pointer;
}

.filter.is-active {
  color: #d9e3ef;
  background: rgba(111, 136, 163, 0.34);
  border-color: rgba(123, 146, 174, 0.6);
}

.project-count {
  margin: 0;
  color: var(--muted);
  font-size: 0.77rem;
}

.project-grid {
  margin-top: 0.86rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.project-card {
  padding: 0.88rem;
  --rx: 0deg;
  --ry: 0deg;
  transform: perspective(900px) rotateX(var(--rx)) rotateY(var(--ry));
  transform-style: preserve-3d;
  transition: transform 0.16s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  border-color: rgba(119, 146, 175, 0.48);
  box-shadow: 0 0 0 1px rgba(119, 146, 175, 0.14), 0 14px 28px rgba(0, 0, 0, 0.2);
}

.project-card .tag {
  margin: 0;
  display: inline-block;
  border: 1px solid rgba(119, 146, 175, 0.42);
  border-radius: 0.3rem;
  padding: 0.2rem 0.4rem;
  color: var(--accent);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.project-card h3 {
  margin-top: 0.52rem;
  font-size: 1.2rem;
}

.project-card p {
  margin: 0.42rem 0 0;
  color: var(--muted);
  line-height: 1.52;
  font-size: 0.88rem;
}

.project-card a {
  display: inline-block;
  margin-top: 0.64rem;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 700;
}

.card-toggle {
  margin-top: 0.62rem;
  border: 1px solid var(--line);
  border-radius: 0.34rem;
  background: rgba(18, 30, 46, 0.68);
  color: #93a8c0;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.24rem 0.45rem;
  cursor: pointer;
}

.card-toggle:hover {
  border-color: rgba(119, 146, 175, 0.45);
  color: #dbe5f3;
}

.card-expand {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.28s ease, opacity 0.28s ease, margin-top 0.28s ease;
}

.project-card.expanded .card-expand {
  max-height: 7.6rem;
  opacity: 1;
  margin-top: 0.45rem;
}

.project-card.expanded .card-toggle {
  border-color: rgba(119, 146, 175, 0.5);
  background: rgba(119, 146, 175, 0.18);
  color: #dbe5f3;
}

.project-card.is-hidden {
  display: none;
}

.repo-strip {
  margin-top: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.repo-strip a {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 0.42rem;
  padding: 0.26rem 0.48rem;
  color: #8ea6c2;
  font-size: 0.74rem;
  background: rgba(17, 29, 44, 0.74);
}

.contact-intro {
  margin: 0.55rem 0 0;
  color: var(--muted);
  max-width: 68ch;
  line-height: 1.52;
  font-size: 0.97rem;
}

.contact-grid {
  margin-top: 0.9rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.contact-card {
  display: block;
  text-decoration: none;
  padding: 0.8rem;
}

.contact-card span {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
}

.contact-card strong {
  display: block;
  margin-top: 0.38rem;
  color: var(--text);
  font-size: 1rem;
}

.footer {
  width: min(1220px, 94vw);
  margin: 0 auto 1.5rem;
  color: var(--muted);
  font-size: 0.75rem;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1020px) {
  .split-grid,
  .skill-grid,
  .project-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  #pointcloud-bg {
    opacity: 0.48;
  }
}

@media (max-width: 760px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .eyebrow {
    letter-spacing: 0.13em;
    font-size: 0.7rem;
  }

  h1 {
    font-size: clamp(2rem, 11vw, 3rem);
  }
}