:root {
  color-scheme: dark;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.page {
  width: min(100%, 760px);
  display: grid;
  gap: 20px;
}

.card {
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.35);
}

h1,
h2 {
  margin: 0 0 12px;
}

p {
  margin: 0 0 18px;
  line-height: 1.65;
  color: #cbd5e1;
}

label {
  display: block;
  margin: 16px 0 8px;
  font-weight: 600;
}

input,
textarea {
  width: 100%;
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 14px;
  padding: 14px 16px;
  background: rgba(15, 23, 42, 0.75);
  color: #e2e8f0;
  font-size: 1rem;
}

textarea {
  resize: vertical;
}

button {
  margin-top: 18px;
  width: 100%;
  border: none;
  border-radius: 14px;
  padding: 14px 16px;
  font-size: 1rem;
  cursor: pointer;
  background: linear-gradient(135deg, #6366f1, #ec4899);
  color: white;
  font-weight: 700;
}

button:hover {
  opacity: 0.95;
}

.messages {
  display: grid;
  gap: 14px;
}

.message-item {
  padding: 18px;
  border-radius: 18px;
  background: rgba(30, 41, 59, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.12);
}

.message-item strong {
  display: block;
  margin-bottom: 8px;
}

.message-item time {
  display: block;
  margin-top: 12px;
  font-size: 0.9rem;
  color: #94a3b8;
}

.alert {
  padding: 14px 16px;
  border-radius: 14px;
  margin-bottom: 14px;
  font-weight: 600;
}

.alert.hidden {
  display: none;
}

.alert.error {
  background: rgba(220, 38, 38, 0.15);
  color: #fecaca;
  border: 1px solid rgba(248, 113, 113, 0.25);
}

.alert.success {
  background: rgba(34, 197, 94, 0.15);
  color: #bbf7d0;
  border: 1px solid rgba(110, 231, 183, 0.25);
}