:root {
  --green-dark: #0f6e56;
  --green-mid: #1d9e75;
  --stone: #f5f3ee;
  --ink: #1c1c1a;
  --ink-light: #888780;
  --danger: #c0392b;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #e1f5ee, #f5f3ee);
  color: var(--ink);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}
.card {
  background: #fff;
  width: 100%;
  max-width: 380px;
  border-radius: 16px;
  padding: 2.5rem 2rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
  text-align: center;
}
.logo { font-size: 3rem; margin-bottom: 0.5rem; }
h1 { font-size: 1.35rem; color: var(--green-dark); margin-bottom: 0.4rem; }
.sub { font-size: 0.88rem; color: var(--ink-light); margin-bottom: 1.75rem; line-height: 1.5; }
form { display: flex; flex-direction: column; gap: 1rem; text-align: left; }
.field span { display: block; font-size: 0.78rem; color: var(--ink-light); margin-bottom: 0.35rem; }
.field input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1.5px solid #ddd;
  border-radius: 9px;
  font-size: 1rem;
}
.field input:focus { outline: none; border-color: var(--green-mid); }
.checkbox { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; color: var(--ink); cursor: pointer; }
.checkbox input { width: 16px; height: 16px; accent-color: var(--green-mid); }
button {
  background: var(--green-dark);
  color: #fff;
  border: none;
  padding: 0.8rem;
  border-radius: 9px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.15s;
}
button:hover { background: var(--green-mid); }
button:disabled { opacity: 0.6; cursor: default; }
.error { color: var(--danger); font-size: 0.85rem; text-align: center; }