:root {
  --bg: #0b1020;
  --bg-accent: #11182d;
  --card: rgba(17, 24, 45, 0.88);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #f3f6ff;
  --muted: #a9b4d0;
  --input-bg: rgba(255, 255, 255, 0.04);
  --input-border: rgba(255, 255, 255, 0.12);
  --input-focus: #6ea8fe;
  --button: linear-gradient(135deg, #4f8cff 0%, #7a5cff 100%);
  --button-hover: linear-gradient(135deg, #6aa0ff 0%, #8b70ff 100%);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(79, 140, 255, 0.18), transparent 35%),
    radial-gradient(circle at bottom right, rgba(122, 92, 255, 0.15), transparent 35%),
    linear-gradient(160deg, var(--bg) 0%, var(--bg-accent) 100%);
  color: var(--text);
}

body {
  min-height: 100vh;
  padding: 32px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  backdrop-filter: blur(2px);
  pointer-events: none;
}

body > h1,
body > p,
body > form {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  margin: 0;
}

body > h1 {
  text-align: center;
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 4px;
}

body > p {
  padding: 14px 16px;
  border: 1px solid rgba(255, 193, 7, 0.28);
  border-radius: 14px;
  background: rgba(255, 193, 7, 0.08);
  color: #ffe08a;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

form {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 24px;
  backdrop-filter: blur(14px);
}

label {
  display: block;
  margin-bottom: 18px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
  text-align: left;
}

input[type="email"] {
  width: 100%;
  margin-top: 8px;
  padding: 14px 16px;
  border: 1px solid var(--input-border);
  border-radius: 14px;
  background: var(--input-bg);
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

input[type="email"]::placeholder {
  color: #7f8aad;
}

input[type="email"]:focus {
  border-color: var(--input-focus);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 0 0 4px rgba(110, 168, 254, 0.18);
}

input[type="hidden"] {
  display: none;
}

button[type="submit"] {
  width: 100%;
  margin-top: 8px;
  padding: 14px 18px;
  border: 0;
  border-radius: 14px;
  background: var(--button);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  box-shadow: 0 12px 30px rgba(79, 140, 255, 0.28);
  transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}

button[type="submit"]:hover {
  background: var(--button-hover);
  transform: translateY(-1px);
  box-shadow: 0 16px 34px rgba(79, 140, 255, 0.34);
}

button[type="submit"]:active {
  transform: translateY(0);
  box-shadow: 0 8px 18px rgba(79, 140, 255, 0.24);
}

@media (max-width: 600px) {
  body {
    padding: 24px 16px;
    gap: 16px;
  }

  body > h1 {
    font-size: 2.2rem;
  }

  form {
    padding: 24px 18px;
    border-radius: 16px;
  }

  input[type="email"],
  button[type="submit"] {
    font-size: 0.98rem;
  }
}