:root {
  color-scheme: dark;
  --bg: #030711;
  --bg-2: #07111e;
  --text: #f5f7ff;
  --muted: #8ea3c1;
  --primary: #7b61ff;
  --accent: #2fdcff;
  --accent-2: #3c7bff;
  --glass: rgba(10, 18, 34, 0.55);
  --border: rgba(255, 255, 255, 0.14);
  --shadow: 0 20px 80px rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: auto;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(123, 97, 255, 0.26), transparent 30%),
    radial-gradient(circle at bottom right, rgba(47, 220, 255, 0.16), transparent 30%),
    linear-gradient(135deg, var(--bg), var(--bg-2));
  min-height: 100vh;
  overflow-x: hidden;
}

body.theme-light {
  --bg: #f4f7ff;
  --bg-2: #dfe8ff;
  --text: #081224;
  --muted: #4e5d78;
  --glass: rgba(255, 255, 255, 0.58);
  --border: rgba(15, 23, 42, 0.1);
  --shadow: 0 18px 70px rgba(66, 84, 110, 0.18);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: 0;
}

#scene-canvas,
#particle-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

#particle-canvas {
  pointer-events: none;
  mix-blend-mode: screen;
}

.cursor-glow {
  position: fixed;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.35);
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 1000;
  transition: transform 0.2s ease, opacity 0.2s ease;
  backdrop-filter: blur(8px);
  opacity: 0.7;
}

.glass-panel {
  background: var(--glass);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.navbar {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: min(1160px, calc(100% - 32px));
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-radius: 999px;
  z-index: 20;
  transition: all 0.35s ease;
}

.navbar.scrolled {
  top: 12px;
  padding: 12px 20px;
  width: min(1080px, calc(100% - 24px));
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0.24em;
}

.brand__mark {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--primary));
  box-shadow: 0 0 20px var(--accent);
}

.nav-links,
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  transition: color 0.25s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

.icon-btn,
.btn {
  border-radius: 999px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.icon-btn {
  width: 42px;
  height: 42px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.icon-btn:hover,
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(47, 220, 255, 0.16);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.btn--primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
}

.btn--ghost {
  background: transparent;
  border: 1px solid var(--border);
}

.mini-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  padding: 10px 14px;
  margin-top: 12px;
}

main {
  position: relative;
  z-index: 1;
}

.section {
  position: relative;
  min-height: 100vh;
  padding: 140px 24px 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero {
  align-items: flex-start;
  padding-top: 180px;
}

.hero__content {
  max-width: 720px;
}

.eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.38em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 16px;
}

h1,
h2,
h3 {
  font-family: 'Orbitron', sans-serif;
  line-height: 1.1;
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 6rem);
  margin-bottom: 18px;
}

.hero__copy,
.section__heading p,
.card p,
.final p {
  color: var(--muted);
  max-width: 620px;
  line-height: 1.75;
  font-size: 1rem;
}

.hero__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 26px 0 34px;
}

.hero__stats {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}

.hero__stats div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero__stats strong {
  font-size: 1.2rem;
}

.hero__floating-card {
  position: absolute;
  right: 8%;
  bottom: 12%;
  padding: 18px 24px;
  border-radius: 24px;
  max-width: 280px;
}

.section__heading {
  max-width: 720px;
  margin-bottom: 32px;
}

.section__heading h2 {
  font-size: clamp(2rem, 3.4vw, 2.8rem);
  margin-bottom: 12px;
}

.era__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(220px, 1fr));
  gap: 24px;
}

.card {
  border-radius: 28px;
  padding: 24px;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.card--visual {
  min-height: 260px;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.card--visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 24px;
  display: block;
}

.chip {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
}

.fire,
.castle,
.city,
.robot {
  width: 100%;
  height: 100%;
  border-radius: 24px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
}

.fire::before,
.fire::after,
.castle::before,
.city::before,
.robot::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
}

.fire::before {
  background: radial-gradient(circle at 50% 100%, rgba(255, 166, 38, 0.8), transparent 45%);
  animation: pulse 2.3s ease-in-out infinite;
}

.fire::after {
  background: radial-gradient(circle at 50% 80%, rgba(255, 255, 255, 0.16), transparent 20%);
}

.castle::before {
  background: linear-gradient(145deg, rgba(255,255,255,0.08), transparent 70%),
    radial-gradient(circle at 30% 30%, rgba(47,220,255,0.12), transparent 30%);
}

.city::before {
  background: linear-gradient(120deg, rgba(255,255,255,0.1), transparent 70%),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.12) 0 2px, transparent 2px 48px);
}

.robot::before {
  background: linear-gradient(145deg, rgba(123,97,255,0.2), transparent 65%);
}

.final {
  align-items: center;
  text-align: center;
}

.final__content {
  padding: 48px;
  border-radius: 36px;
  max-width: 760px;
}

.footer {
  position: relative;
  z-index: 1;
  margin: 0 24px 24px;
  padding: 28px 32px;
  border-radius: 32px;
  display: grid;
  grid-template-columns: 1.2fr 1fr auto;
  align-items: center;
  gap: 20px;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(123, 97, 255, 0.12), rgba(47, 220, 255, 0.12));
  pointer-events: none;
}

.footer__intro h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.footer__intro p {
  color: var(--muted);
  max-width: 500px;
  line-height: 1.75;
}

.footer__actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__socials {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.footer__socials a {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.footer__socials a:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(47, 220, 255, 0.16);
}

.footer__back {
  width: fit-content;
}

.footer__meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: right;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer__signal {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer__signature {
  font-family: 'Orbitron', sans-serif;
  font-size: 1rem;
  color: var(--text);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  animation: signatureFloat 3.2s ease-in-out infinite;
}

@keyframes signatureFloat {
  0%,
  100% {
    transform: translateY(0px);
    text-shadow: 0 0 0 rgba(47, 220, 255, 0);
  }
  50% {
    transform: translateY(-3px);
    text-shadow: 0 0 12px rgba(47, 220, 255, 0.24);
  }
}

.era--stone {
  background: linear-gradient(135deg, rgba(255, 114, 109, 0.06), transparent 60%);
}

.era--medieval {
  background: linear-gradient(135deg, rgba(92, 182, 255, 0.06), transparent 60%);
}

.era--present {
  background: linear-gradient(135deg, rgba(123, 97, 255, 0.08), transparent 60%);
}

.era--future {
  background: linear-gradient(135deg, rgba(47, 220, 255, 0.08), transparent 60%);
}