:root {
  color-scheme: dark;
  --bg: #06343c;
  --card: #0b4650;
  --line: #1c6d7a;
  --field: #072e35;
  --text: #e8f8f8;
  --muted: #b5dde3;
  --danger: #ffb4b4;
  --button: #12c3cf;
  --button-text: #04262b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
}

.card {
  width: min(100% - 2rem, 22.5rem);
  padding: 1.75rem 1.5rem 1.35rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1rem;
}

h1 {
  margin: 0;
  font-size: 1.8rem;
  font-weight: 650;
  letter-spacing: -0.03em;
}

.lead {
  margin: 0.45rem 0 1.35rem;
  color: var(--muted);
  line-height: 1.45;
}

form {
  display: grid;
  gap: 0.7rem;
}

label {
  font-size: 0.92rem;
}

input,
button {
  font: inherit;
}

input {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  background: var(--field);
  color: var(--text);
}

input:focus {
  outline: 2px solid var(--button);
  outline-offset: 1px;
}

button {
  padding: 0.75rem 1rem;
  border: 0;
  border-radius: 0.7rem;
  background: var(--button);
  color: var(--button-text);
  font-weight: 700;
  cursor: pointer;
}

button:disabled {
  opacity: 0.55;
  cursor: wait;
}

.error {
  min-height: 1.25rem;
  margin: 0;
  color: var(--danger);
  font-size: 0.95rem;
}