@import url('https://fonts.googleapis.com/css2?family=Cascadia+Code:ital,wght@0,200..700;1,200..700&display=swap');

:root {
  --primary-bg: #0a0a0f;
  --accent-blue: #1f6feb;
  --accent-purple: #9b59b6;
  --text-primary: #e6e8eb;
  --text-secondary: #8b949e;
  --shadow-dark: rgba(0,0,0,0.4);
}

* {
  box-sizing: border-box;
}

body {
  font-family: "Cascadia Code", ui-monospace, monospace;
  margin: 0;
  background: var(--primary-bg);
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(31, 111, 235, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(155, 89, 182, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(139, 69, 19, 0.05) 0%, transparent 50%);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-height: 100dvh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

nav {
  background: linear-gradient(135deg, #000000 0%, #0f0f23 100%);
  width: 100%;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 
    0 4px 16px rgba(0,0,0,0.4),
    0 2px 4px rgba(31, 111, 235, 0.1);
  gap: 2rem;
  border-bottom: 1px solid rgba(31, 111, 235, 0.2);
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-logo {
  max-height: 44px;
  filter: 
    drop-shadow(0 0 8px rgba(255, 255, 255, 0.3))
    drop-shadow(0 0 16px rgba(31, 111, 235, 0.2));
  margin-left: 1.5rem;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
}

.nav-links a {
  color: #f0f2f5;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
  border-bottom: 2px solid transparent;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-links a:hover {
  color: var(--accent-blue);
  border-bottom-color: var(--accent-blue);
}

header {
  background: linear-gradient(135deg, #1a237e 0%, #4a148c 35%, #6a1b9a 70%, #1f6feb 100%);
  background-size: 200% 200%;
  width: 100%;
  padding: 3rem 2rem;
  box-shadow: 
    0 8px 32px rgba(0,0,0,0.3),
    inset 0 1px 0 rgba(255,255,255,0.1);
  position: relative;
  animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.05) 50%, transparent 70%);
  pointer-events: none;
}

.logo {
  max-width: 140px;
  margin-bottom: 1.5rem;
  filter: 
    drop-shadow(0 0 12px rgba(155, 89, 182, 0.4))
    drop-shadow(0 4px 8px rgba(0,0,0,0.3));
}

header h1 {
  margin: 0;
  font-size: 3rem;
  font-weight: 700;
  text-shadow: 
    0 2px 4px rgba(0,0,0,0.5),
    0 0 20px rgba(255,255,255,0.1);
  letter-spacing: -0.02em;
}

header p {
  font-size: 1.3rem;
  margin-top: 1rem;
  font-weight: 400;
  opacity: 0.9;
  text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

main {
  max-width: 900px;
  padding: 3rem 2rem;
  width: 100%;
  box-sizing: border-box;
}

.download-btn {
  display: inline-block;
  padding: 1.2rem 2.5rem;
  font-size: 1.4rem;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, #1f6feb 0%, #8b5cf6 50%, #9b59b6 100%);
  border: none;
  border-radius: 12px;
  text-decoration: none;
  margin-top: 2.5rem;
  box-shadow: 
    0 8px 25px rgba(31, 111, 235, 0.25),
    0 4px 12px rgba(0,0,0,0.2),
    inset 0 1px 0 rgba(255,255,255,0.2);
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.download-btn:hover {
  box-shadow: 
    0 12px 35px rgba(31, 111, 235, 0.35),
    0 6px 16px rgba(0,0,0,0.3),
    inset 0 1px 0 rgba(255,255,255,0.3);
}

footer {
  margin-top: auto;
  padding: 2rem;
  background: linear-gradient(135deg, #0f1419 0%, #161b22 100%);
  font-size: 0.95rem;
  color: var(--text-secondary);
  width: 100%;
  border-top: 1px solid rgba(48, 54, 61, 0.5);
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}