:root {
  --bg1: #0f172a;
  --bg2: #1e293b;
  --accent: #38bdf8;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --card: rgba(15, 23, 42, 0.55);
  --border: rgba(148, 163, 184, 0.2);
}

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

html, body {
  width: 100%;
  min-height: 100%;
}

body {
  font-family: 'Poppins', sans-serif;
  color: var(--text);
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
  overflow-x: hidden;
}

.bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(56,189,248,0.15), transparent 30%),
    radial-gradient(circle at 80% 10%, rgba(59,130,246,0.12), transparent 30%),
    radial-gradient(circle at 50% 90%, rgba(14,165,233,0.10), transparent 30%);
  filter: blur(8px);
  z-index: -1;
}

.container {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  width: min(720px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  backdrop-filter: blur(8px);
  box-shadow: 0 20px 60px rgba(2, 6, 23, 0.45);
  padding: 36px 28px;
  text-align: center;
}

.tag {
  display: inline-block;
  font-size: 0.85rem;
  color: #bae6fd;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 14px;
}

.subtitle {
  color: var(--muted);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  max-width: 560px;
  margin: 0 auto 28px;
}

.countdown {
  display: grid;
  grid-template-columns: repeat(4, minmax(70px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.box {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 10px;
}

.box span {
  display: block;
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 700;
}

.box small {
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.5px;
}

.notify-form {
  display: flex;
  gap: 10px;
  max-width: 520px;
  margin: 0 auto;
  flex-wrap: wrap;
  justify-content: center;
}

.notify-form input {
  flex: 1 1 260px;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 12px 14px;
  outline: none;
}

.notify-form input::placeholder {
  color: #64748b;
}

.notify-form button {
  border: none;
  background: linear-gradient(135deg, #0ea5e9, #38bdf8);
  color: #082f49;
  font-weight: 700;
  padding: 12px 18px;
  border-radius: 10px;
  cursor: pointer;
  transition: transform .2s ease, filter .2s ease;
}

.notify-form button:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

.footer {
  margin-top: 20px;
  color: #64748b;
  font-size: 0.85rem;
}

@media (max-width: 520px) {
  .card {
    padding: 26px 16px;
  }
  .countdown {
    grid-template-columns: repeat(2, minmax(90px, 1fr));
  }
}