:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --card: #ffffff;
  --border: #d9e1ec;
  --text: #122033;
  --muted: #627086;
  --accent: #175cff;
  --danger: #c23b35;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: var(--bg);
}

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

.card {
  width: min(100%, 360px);
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--card);
}

h1 {
  margin: 0 0 8px;
  font-size: 1.6rem;
}

p {
  margin: 0 0 20px;
  color: var(--muted);
}

label {
  display: block;
  margin: 0 0 8px;
  font-size: 0.92rem;
  color: var(--muted);
}

input {
  width: 100%;
  margin: 0 0 16px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font: inherit;
  color: var(--text);
  background: #fff;
}

input:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 12px 14px;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  cursor: pointer;
}

button:disabled {
  opacity: 0.7;
  cursor: wait;
}

.form-status {
  min-height: 1.2em;
  margin: 14px 0 0;
  font-size: 0.92rem;
}

.form-status.error {
  color: var(--danger);
}