:root {
  color-scheme: light;
  --bg-color: #ffffff;
  --word-color: #000000;
  --toggle-bg-on: linear-gradient(135deg, #3a6fe6, #2f5ad4);
  --toggle-border-on: rgba(45, 88, 213, 0.35);
  --toggle-bg-off: linear-gradient(180deg, rgba(243, 243, 244, 0.94) 0%, rgba(226, 226, 228, 0.92) 100%);
  --toggle-border-off: rgba(165, 175, 196, 0.2);
  --toggle-knob: linear-gradient(135deg, #ffffff, #f6f7fb);
  --toggle-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
}

body {
  background: var(--bg-color);
  color: var(--word-color);
  min-height: 100vh;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Poppins', ui-sans-serif, system-ui;
  position: relative;
  overflow: hidden;
  transition: background 0.6s ease;
}

body.theme-dark {
  color-scheme: dark;
  --bg-color: #000000;
  --word-color: #f8fafc;
  --toggle-bg-off: rgba(54, 60, 74, 0.55);
  --toggle-border-off: rgba(118, 128, 150, 0.22);
  --toggle-knob: linear-gradient(135deg, #f2f4ff, #dfe3f4);
}

.hero-card {
  --logo-size: min(70vw, 26rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(1.25rem, 3vw, 2.5rem);
  transform: translateY(-4vh);
}

.logo-wrapper {
  position: relative;
  width: var(--logo-size);
}

.hero-logo {
  width: 100%;
  height: auto;
  display: block;
}

.hero-tagline {
  position: absolute;
  right: 0;
  top: calc(100% + clamp(0.35rem, calc(var(--logo-size) / 36), 0.65rem));
  margin: 0;
  font-size: clamp(0.72rem, calc(var(--logo-size) / 16.5), 1rem);
  letter-spacing: 0.02em;
  line-height: 1.05;
  color: #111827;
}

body.theme-dark .hero-tagline {
  color: #ffffff;
}

.word-stage {
  position: fixed;
  inset: 0;
  pointer-events: none;
  font-family: 'Poppins', ui-sans-serif, system-ui;
  color: var(--word-color);
  z-index: 10;
}

.corner-word {
  position: absolute;
  margin: 0;
  font-weight: 600;
  font-size: clamp(1.1rem, 2vw + 0.5rem, 2rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0;
  color: inherit;
}

@media (prefers-reduced-motion: reduce) {
  [data-hero] {
    transform: none !important;
  }
}

.theme-toggle {
  position: fixed;
  top: clamp(0.08rem, 1.5vw, 0.9rem);
  right: clamp(0.85rem, 4vw, 2.75rem);
  width: 56px;
  height: 24px;
  border-radius: 9999px;
  background: var(--toggle-bg-off);
  display: inline-flex;
  align-items: center;
  padding: 2px;
  border: 1px solid var(--toggle-border-off);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.35),
    0 2px 6px rgba(15, 23, 42, 0.05),
    var(--toggle-shadow);
  transition: background 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
  cursor: pointer;
  z-index: 30;
}

.theme-toggle:focus-visible {
  outline: 2px solid rgba(10, 132, 255, 0.6);
  outline-offset: 4px;
}

.theme-toggle__knob {
  width: 30px;
  height: 20px;
  border-radius: 11px;
  background: var(--toggle-knob);
  border: none;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
  transform: translateX(0);
  transition: transform 0.35s cubic-bezier(0.22, 0.61, 0.36, 1), box-shadow 0.35s ease;
}

.theme-toggle[data-state='dark'] {
  background: var(--toggle-bg-on);
  border-color: var(--toggle-border-on);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.28), 0 4px 10px rgba(47, 90, 212, 0.18);
}

.theme-toggle[data-state='dark'] .theme-toggle__knob {
  transform: translateX(20px);
  box-shadow: 0 2px 6px rgba(45, 88, 210, 0.18);
}

@media (max-width: 520px) {
  .theme-toggle {
    width: 48px;
    height: 20px;
    padding: 1.5px;
  }

  .theme-toggle__knob {
    width: 26px;
    height: 16px;
    border-radius: 9px;
  }

  .theme-toggle[data-state='dark'] .theme-toggle__knob {
    transform: translateX(16px);
  }
}