:root {
  --primary: #007aff;
  --surface: #f8f9fa;
  --text-main: #1a1a1a;
  --radius: 8px;
  --border: #e1e5e9;
  /* loginform */
  --form-label: #4e4e4e;
  --form-bg: #fff;
  --error:rgb(255, 0, 0);
}
body {
  background-color: var(--surface);
  font-family: "LINE Seed JP", sans-serif;
  color: var(--text-main);
  min-height: 100vh;
  margin: 10px;
  display: flex;
}
body::-webkit-scrollbar {
  display: none;
}
/* index.html */
.login {
  margin: auto;
  padding: 2rem;
  background: var(--form-bg);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}
.login h2 {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--text-main);
  font-weight: 600;
}
.login .form-label {
  display: block;
  margin: 0.25rem 0;
  font-weight: 500;
  color: var(--form-label);
}
.login .form-control {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  transition:
    border-color 0.3s ease,
    box-shadow 0.3s ease;
  box-sizing: border-box;
}
.login .form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
}
.login .btn-login {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary));
  color: var(--surface);
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}
@media screen and (min-width: 450px) {
  .login {
    width: 300px;
  }
}
#error-message {
  font-size: 1rem;
  height: 2rem;
  color:var(--error);
  text-align: center;
  margin: 0.5rem 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}