* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: #f0f2f5;
  color: #222;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}
.card {
  background: #fff;
  border-radius: 14px;
  padding: 1.75rem;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 4px 24px rgba(0,0,0,.08);
}
h1 { margin: 0 0 .5rem; font-size: 1.35rem; }
h2 { margin: 1rem 0 .75rem; font-size: 1.05rem; }
label { display: block; margin: 0 0 .75rem; font-size: .92rem; }
input, select, textarea {
  display: block; width: 100%; margin-top: .35rem;
  padding: .65rem .75rem; border: 1px solid #d0d5dd; border-radius: 8px; font: inherit;
}
.checkbox { display: flex; gap: .5rem; align-items: flex-start; }
.checkbox input { width: auto; margin-top: .2rem; }
.btn {
  display: block; width: 100%; text-align: center; text-decoration: none;
  background: #06c755; color: #fff; border: none; border-radius: 8px;
  padding: .75rem 1rem; font-weight: 600; cursor: pointer; margin: .4rem 0;
}
.btn.google { background: #4285f4; }
.btn.line { background: #06c755; }
.channels { margin: 1rem 0; }
hr { border: none; border-top: 1px solid #eee; margin: 1.25rem 0; }
.msg { margin-top: .75rem; font-size: .9rem; }
.msg.ok { color: #067647; }
.msg.err { color: #b42318; }
.muted { color: #667085; font-size: .9rem; }
.hidden { display: none; }
a { color: #06c755; }
.done-box { text-align: center; padding: 1rem 0; }
.done-box h2 { margin: 0 0 0.5rem; color: #067647; }