:root {
  --bg: #0f1115;
  --card: #1a1d24;
  --border: #2a2e38;
  --accent: #4c8bf5;
  --error: #ff5c5c;
  --text: #e6e8ec;
  --muted: #8b909a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: 20px;
}

.card-wrap {
  width: 100%;
  max-width: 400px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
}

h1 {
  margin: 0 0 20px;
  font-size: 20px;
  font-weight: 600;
}

.field { margin-bottom: 16px; display: flex; flex-direction: column; }

.row { display: flex; gap: 14px; }
.row .field { flex: 1; min-width: 0; }

label {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

input {
  width: 100%;
  min-width: 0;
  background: #12151b;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 11px 12px;
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color .15s;
}

input:focus { border-color: var(--accent); }
input.invalid { border-color: var(--error); }

.error {
  color: var(--error);
  font-size: 12px;
  margin-top: 5px;
  min-height: 14px;
}

button {
  width: 100%;
  margin-top: 8px;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .15s;
}

button:hover { opacity: .9; }
button:disabled { opacity: .5; cursor: not-allowed; }

.status {
  text-align: center;
  font-size: 13px;
  margin: 14px 0 0;
  min-height: 16px;
}
.status.ok { color: #3fd07f; }
.status.err { color: var(--error); }