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

:root {
  --bg-deep: #0a0e1a;
  --bg-mid: #111827;
  --ice: #7dd3fc;
  --ice-dim: #38bdf8;
  --frost: #e0f2fe;
  --text: #cbd5e1;
  --text-muted: #64748b;
}

html,
body {
  height: 100%;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg-deep);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.background {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(56, 189, 248, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 100%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-mid) 100%);
  z-index: 0;
}

.frost-overlay {
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.03) 0%, transparent 40%),
    radial-gradient(circle at 70% 60%, rgba(255, 255, 255, 0.02) 0%, transparent 35%),
    radial-gradient(circle at 50% 80%, rgba(125, 211, 252, 0.04) 0%, transparent 45%);
  z-index: 1;
  pointer-events: none;
}

.content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem;
  max-width: 36rem;
}

.logo-mark {
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1.5rem;
  color: var(--ice);
  opacity: 0.85;
}

.logo-mark svg {
  width: 100%;
  height: 100%;
}

.title {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 300;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--frost);
  line-height: 1.1;
}

.tagline {
  font-size: clamp(1rem, 3vw, 1.25rem);
  font-weight: 400;
  letter-spacing: 0.45em;
  text-transform: uppercase;
  color: var(--ice-dim);
  margin-top: 0.75rem;
}

.divider {
  width: 3rem;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--ice-dim), transparent);
  margin: 2rem auto;
}

.subtitle {
  font-size: 1rem;
  font-weight: 300;
  color: var(--text-muted);
  line-height: 1.6;
  letter-spacing: 0.02em;
}

.footer {
  position: fixed;
  bottom: 1.5rem;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.lang-switch {
  display: flex;
  gap: 0.25rem;
}

.lang-switch button {
  padding: 0.2rem 0.5rem;
  font: inherit;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 0.25rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.lang-switch button:hover {
  color: var(--ice);
}

.lang-switch button.active {
  color: var(--ice);
  border-color: rgba(125, 211, 252, 0.15);
}

@media (max-width: 480px) {
  .title {
    letter-spacing: 0.1em;
  }

  .tagline {
    letter-spacing: 0.3em;
  }
}