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

:root {
  --bg: #0a0a0f;
  --surface: #13131a;
  --border: #1e1e2e;
  --accent: #7c3aed;
  --accent-light: #a78bfa;
  --accent-glow: rgba(124, 58, 237, 0.25);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --white: #ffffff;
}

html, body {
  height: 100%;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Stars background */
.stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.star {
  position: absolute;
  width: 2px;
  height: 2px;
  background: white;
  border-radius: 50%;
  animation: twinkle var(--duration) infinite ease-in-out;
  opacity: 0;
}

@keyframes twinkle {
  0%, 100% { opacity: 0; }
  50% { opacity: var(--brightness); }
}

/* Header */
header {
  position: relative;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 3rem;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(10px);
}

.logo {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--white);
}

nav span {
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.05em;
  border: 1px solid var(--border);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
}

/* Main */
main {
  position: relative;
  z-index: 10;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem;
}

.badge {
  display: inline-block;
  background: var(--accent-glow);
  border: 1px solid var(--accent);
  color: var(--accent-light);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  margin-bottom: 2rem;
  animation: fadeDown 0.6s ease both;
}

h1 {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--white);
  margin-bottom: 1.5rem;
  animation: fadeDown 0.7s ease both;
}

h1 span {
  background: linear-gradient(135deg, var(--accent-light), #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  max-width: 540px;
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  animation: fadeDown 0.8s ease both;
}

/* CTA Button */
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--accent);
  color: var(--white);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 700;
  padding: 0.9rem 2.2rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  box-shadow: 0 0 30px var(--accent-glow);
  animation: fadeDown 0.9s ease both;
}

.cta-btn:hover {
  background: #6d28d9;
  transform: translateY(-3px);
  box-shadow: 0 0 50px rgba(124, 58, 237, 0.5);
}

.cta-btn:active {
  transform: translateY(0);
}

.cta-hint {
  margin-top: 0.9rem;
  font-size: 0.82rem;
  color: var(--muted);
  animation: fadeDown 1s ease both;
}

/* Stack */
.stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 4rem;
  animation: fadeUp 1s ease both;
}

.stack-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  cursor: default;
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
  position: relative;
}

.stack-item:hover {
  border-color: var(--accent);
  color: var(--white);
  transform: translateY(-2px);
}

.stack-item::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.75rem;
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.stack-item:hover::after {
  opacity: 1;
}

/* Footer */
footer {
  position: relative;
  z-index: 10;
  border-top: 1px solid var(--border);
  padding: 1.5rem 3rem;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(10px);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  max-width: 1100px;
  margin: 0 auto;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-size: 0.85rem;
}

.footer-left strong {
  color: var(--white);
}

.footer-left span {
  color: var(--muted);
}

.footer-right {
  font-size: 0.82rem;
  color: var(--muted);
  text-align: right;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--accent);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 100;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Animations */
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 600px) {
  header { padding: 1rem 1.5rem; }
  footer { padding: 1.5rem; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-right { text-align: center; }
}