:root {
  color-scheme: dark;
  --bg: #050915;
  --bg-strong: #03060f;
  --bg-soft: #0b1223;
  --surface: rgba(9, 14, 24, 0.88);
  --surface-2: rgba(16, 24, 40, 0.88);
  --surface-3: rgba(24, 34, 52, 0.65);
  --text: #f6f8ff;
  --muted: #99a7c4;
  --muted-strong: #c0c9df;
  --accent: #6ddcff;
  --accent-strong: #4fc3ff;
  --line: rgba(255, 255, 255, 0.12);
  --shadow: 0 30px 80px rgba(3, 8, 21, 0.55);
  --radius: 18px;
  --font-base: "Inter", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--bg); }
body {
  margin: 0;
  min-height: 100svh;
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 20%, rgba(52, 97, 166, 0.28), transparent 55%),
    radial-gradient(circle at 80% 10%, rgba(111, 82, 214, 0.26), transparent 45%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-strong) 60%, var(--bg-soft) 100%);
  padding-top: 80px;
}
@media (max-width: 720px) {
  body { padding-top: 72px; }
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}
a:hover,
a:focus-visible {
  color: var(--accent-strong);
}
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection {
  background: rgba(111, 208, 255, 0.35);
  color: var(--text);
}

.container {
  width: min(1200px, 90vw);
  margin: 0 auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  backdrop-filter: blur(18px) saturate(140%);
  background: rgba(6, 10, 22, 0.7);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}
.site-logo {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text);
}
.site-nav {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--muted-strong);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35em;
  padding: 0.55em 1.1em;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  color: #0b111d;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-strong) 100%);
  box-shadow: 0 14px 28px rgba(49, 150, 201, 0.26);
}
.btn:hover,
.btn:focus-visible {
  color: #07101f;
  filter: brightness(1.05);
}
.btn.btn-ghost {
  color: var(--accent);
  background: transparent;
  border-color: rgba(110, 198, 255, 0.24);
  box-shadow: none;
}
.btn.btn-ghost:hover,
.btn.btn-ghost:focus-visible {
  color: var(--accent-strong);
  border-color: rgba(110, 198, 255, 0.45);
}
.btn.btn-small {
  padding: 0.4em 0.95em;
  font-size: 0.9rem;
}

.scene-wrap {
  position: relative;
  height: calc(100svh - 80px);
  min-height: 540px;
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  display: grid;
  place-items: center;
}
#scene-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.bg-title {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  user-select: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 800;
  color: color-mix(in oklab, var(--text) 12%, transparent);
  -webkit-text-stroke: 1px color-mix(in oklab, var(--text) 18%, transparent);
}
.bg-title span {
  display: block;
  line-height: 0.9;
  font-size: clamp(2.8rem, 9vw, 8.6rem);
  text-align: center;
}
.bg-title span + span { margin-top: -0.2em; }

.center-hub {
  position: relative;
  z-index: 3;
  display: grid;
  gap: 10px;
  justify-items: center;
  padding: 20px 26px;
  border-radius: var(--radius);
  background: color-mix(in oklab, var(--surface) 70%, transparent);
  border: 1px solid var(--line);
  backdrop-filter: blur(12px) saturate(170%);
  box-shadow: var(--shadow);
  text-align: center;
  max-width: min(460px, 85vw);
}
.center-hub .eyebrow {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.center-hub h1 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  letter-spacing: 0.04em;
}
.center-hub .hub-tagline {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}
.center-hub .hub-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.center-hub .hint {
  color: var(--muted);
  opacity: 0.8;
  font-size: 0.85rem;
}

.island-labels {
  position: absolute;
  inset: 0;
  pointer-events: none;
  transition: opacity 0.45s ease;
}
.island-label {
  position: absolute;
  left: var(--x);
  top: var(--y);
  transform: translate(-50%, -50%);
  pointer-events: auto;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: var(--surface-2);
  color: var(--text);
  font-size: 0.85rem;
  box-shadow: 0 10px 28px rgba(3, 8, 23, 0.35);
  text-transform: none;
}
.has-webgl .island-labels {
  opacity: 0;
  pointer-events: none;
}
.no-webgl .center-hub .hint::after {
  content: " (fallback mode)";
  color: var(--accent);
}

main {
  background: linear-gradient(180deg, rgba(6, 11, 24, 0.96) 0%, rgba(8, 15, 30, 0.94) 100%);
}

.section {
  padding: 120px 0 96px;
}
.section:nth-of-type(odd) {
  background: linear-gradient(180deg, rgba(10, 17, 32, 0.88) 0%, rgba(8, 14, 26, 0.92) 100%);
}
.section .container {
  display: grid;
  gap: 32px;
}
.section h2 {
  font-size: clamp(2rem, 4.4vw, 2.8rem);
  margin: 6px 0 0;
}

.eyebrow {
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin: 0;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.tag-controls {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(12, 20, 36, 0.76);
  color: var(--muted-strong);
  font-size: 0.95rem;
}
.tag-controls span {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.75rem;
}
.tag-controls select {
  appearance: none;
  background: none;
  border: none;
  color: var(--text);
  font-weight: 600;
  padding-right: 4px;
  font-family: inherit;
}
.tag-controls select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 12px;
}

.project-grid {
  display: grid;
  gap: 32px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.card {
  background: rgba(12, 19, 34, 0.88);
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 24px 48px rgba(4, 9, 22, 0.45);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 52px rgba(3, 10, 28, 0.55);
}
.card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.card-body {
  padding: 22px 22px 24px;
  display: grid;
  gap: 16px;
}
.card-title {
  margin: 0;
  font-size: 1.25rem;
}
.card-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.55;
}
.tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.tags li {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
  background: rgba(44, 66, 97, 0.42);
  padding: 6px 12px;
  border-radius: 999px;
}
.card-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.section-about .lede,
.section-contact .lede {
  margin: 0;
  max-width: 700px;
  color: var(--muted-strong);
  font-size: 1.05rem;
}

.about-grid {
  display: grid;
  gap: 26px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.about-grid h3 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}
.about-grid ul {
  margin: 0;
  padding-left: 1.2em;
  color: var(--muted);
  display: grid;
  gap: 10px;
}
.about-grid li {
  line-height: 1.5;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.site-footer {
  padding: 48px 0 60px;
  background: rgba(5, 9, 18, 0.9);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.site-footer small {
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 960px) {
  .site-nav { gap: 14px; }
  .scene-wrap { height: calc(100svh - 72px); }
  .center-hub { padding: 18px 20px; }
  .bg-title span { font-size: clamp(2.4rem, 12vw, 6rem); }
}
@media (max-width: 720px) {
  .site-header .container { padding: 16px 0; }
  .site-nav { gap: 12px; font-size: 0.95rem; }
  .center-hub { width: min(92vw, 440px); }
  .island-label { font-size: 0.78rem; padding: 6px 12px; }
  .section { padding: 96px 0 80px; }
  .card img { height: 160px; }
}
@media (max-width: 520px) {
  .site-nav { justify-content: flex-end; }
  .scene-wrap { min-height: 520px; }
  .center-hub .hint { display: none; }
  .tag-controls { width: 100%; justify-content: space-between; }
}