:root {
  --bg: #0e1710;
  --card: #16241a;
  --border: #2c4530;
  --text: #e7f3e9;
  --muted: #90a894;
  --accent: #5cb85c;
  --accent-hover: #6fce6f;
  --error-bg: #3a1616;
  --error-border: #7a2c2c;
  --success-bg: #16321c;
  --success-border: #2c7a3a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at top, #16281a 0%, var(--bg) 65%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

h1 {
  margin: 0 0 4px;
  font-size: 1.6rem;
  color: var(--accent-hover);
}

.tagline {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 0.9rem;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin: 16px 0 6px;
}

.optional { font-weight: 400; color: var(--muted); }

input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0e1a12;
  color: var(--text);
  font-size: 1rem;
}

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

.hint {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

button {
  width: 100%;
  margin-top: 24px;
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #0e1710;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
}

button:hover { background: var(--accent-hover); }

.alert {
  padding: 14px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.alert.error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
}

.alert.success {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
}

.alert ul { margin: 0; padding-left: 18px; }
.alert code {
  background: rgba(255,255,255,0.08);
  padding: 1px 6px;
  border-radius: 4px;
}

a { color: var(--accent-hover); }

footer {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}