:root {
  --bg-start: #0f172a;
  --bg-end: #1e293b;
  --card-bg: rgba(255, 255, 255, 0.96);
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --ring: rgba(37, 99, 235, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(59, 130, 246, 0.35), transparent 32rem),
    linear-gradient(135deg, var(--bg-start), var(--bg-end));
}

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

.card {
  width: min(100%, 440px);
  padding: 44px 32px;
  text-align: center;
  background: var(--card-bg);
  border-radius: 24px;
  box-shadow: 0 24px 80px rgba(15, 23, 42, 0.35);
}

.logo {
  width: 92px;
  height: 92px;
  margin-bottom: 18px;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.subtitle {
  margin: 14px 0 30px;
  color: var(--muted);
  font-size: 1.05rem;
}

.login-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 52px;
  width: 100%;
  padding: 0 24px;
  border-radius: 14px;
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.login-button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 12px 30px var(--ring);
}

.login-button:focus-visible {
  outline: 4px solid var(--ring);
  outline-offset: 4px;
}

@media (max-width: 480px) {
  .card {
    padding: 36px 22px;
    border-radius: 20px;
  }
}