* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #1e293b, #0b1120 55%);
  color: #f8fafc;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem 1rem;
}

.container {
  width: min(480px, 100%);
}

header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.card {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 12px;
  padding: 1.5rem;
  backdrop-filter: blur(12px);
  box-shadow: 0 25px 60px rgba(15, 23, 42, 0.55);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

label {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
  color: #94a3b8;
}

input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 1px solid #1f2937;
  background: #0f172a;
  color: inherit;
  font-size: 1rem;
  margin-bottom: 1rem;
}

button, .button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(120deg, #22d3ee, #2563eb);
  color: #0f172a;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

button:hover, .button:hover {
  filter: brightness(1.1);
}

.alert {
  background: #7f1d1d;
  color: #fecaca;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.muted {
  color: #94a3b8;
  margin: 0;
}

h1, h2, h3 {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.interface-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.interface-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid rgba(148, 163, 184, 0.12);
}

.link {
  color: #f87171;
  text-decoration: none;
}

.link:hover {
  text-decoration: underline;
}