:root {
  --navy: #0f2f6b;
  --navy-deep: #08162f;
  --yellow: #f7b500;
  --white: #ffffff;
  --text-soft: #d7e1f3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, sans-serif;
  background:
    radial-gradient(circle at top, rgba(247, 181, 0, 0.14), transparent 28%),
    linear-gradient(180deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: var(--white);
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 560px;
  text-align: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(247, 181, 0, 0.3);
  border-radius: 24px;
  padding: 40px 28px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(12px);
}

.icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--yellow);
  color: var(--navy);
  font-size: 26px;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--yellow);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(32px, 5vw, 46px);
  line-height: 1.08;
}

.description {
  margin: 0 auto 28px;
  max-width: 420px;
  color: var(--text-soft);
  font-size: 20px;
  line-height: 1.5;
}

#countdown {
  color: var(--yellow);
  font-weight: 700;
}

.details {
  margin-bottom: 28px;
  padding: 20px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.08);
}

.lesson-title {
  margin: 0 0 10px;
  font-size: 24px;
  font-weight: 700;
}

.lesson-text {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.55;
}

.button {
  display: inline-flex;
  width: 100%;
  justify-content: center;
  align-items: center;
  min-height: 58px;
  padding: 16px 24px;
  border-radius: 16px;
  background: var(--yellow);
  color: var(--navy);
  text-decoration: none;
  font-size: 18px;
  font-weight: 700;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
  opacity: 0.92;
}

@media (max-width: 640px) {
  .card {
    padding: 32px 20px;
  }

  .description {
    font-size: 18px;
  }

  .lesson-title {
    font-size: 22px;
  }
}