/* =========================
   Base reset
   ========================= */

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

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    Inter, Helvetica, Arial, sans-serif;
  background: #000;
  color: #fff;
  overflow-x: hidden;
}

/* =========================
   Background canvas
   ========================= */

#bg {
  position: fixed;
  inset: 0;
  z-index: 0;
}

/* =========================
   Main content layout
   ========================= */

.content {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  padding: 6vh 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

/* =========================
   Wordmark
   ========================= */

.wordmark {
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  letter-spacing: 0.35em;
  font-weight: 500;
  margin: 0 0 2.5rem;
}

/* =========================
   Taglines
   ========================= */

.tagline {
  font-size: clamp(1.7rem, 4vw, 2.9rem);
  font-weight: 400;
  margin: 0 0 1.6rem;
  opacity: 0.95;
}

.sub {
  font-size: 0.95rem;
  margin: 0.35rem 0;
  opacity: 0.65;
  letter-spacing: 0.02em;
}

/* =========================
   Card
   ========================= */

.card {
  margin-top: 3.5rem;
  padding: 2.2rem 2rem;
  max-width: 520px;
  width: 100%;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 18px;
  backdrop-filter: blur(14px);
}

.card h2 {
  margin: 0 0 1rem;
  font-size: 1.3rem;
  font-weight: 500;
}

.card p {
  margin: 0 0 1.4rem;
  font-size: 0.95rem;
  opacity: 0.75;
}

.email {
  color: #fff;
  text-decoration: underline;
}

/* =========================
   Button
   ========================= */

.btn {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  background: #fff;
  color: #000;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  opacity: 0.9;
}

/* =========================
   Learning tag
   ========================= */

.learning-tag {
  margin-top: 1.2rem;
  padding-top: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.85rem;
  opacity: 0.55;
  letter-spacing: 0.03em;
}

/* =========================
   Reveal animation
   ========================= */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  animation: fadeUp 900ms ease forwards;
  will-change: opacity, transform;
}

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

/* Animation timing */
.r1 { animation-delay: 0.2s; }
.r2 { animation-delay: 0.7s; }
.r3 { animation-delay: 1.3s; }
.r4 { animation-delay: 1.9s; }
.r5 { animation-delay: 2.5s; }
.r6 { animation-delay: 3.2s; }

/* =========================
   Reduced motion
   ========================= */

@media (prefers-reduced-motion: reduce) {
  .reveal {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

/* =========================
   Small screens
   ========================= */

@media (max-width: 480px) {
  .content {
    padding-top: 5vh;
  }

  .wordmark {
    letter-spacing: 0.25em;
  }

  .card {
    padding: 1.8rem 1.5rem;
  }
}