/* =====================
   ベース
===================== */
* {
  box-sizing: border-box;
  font-family: sans-serif;
}

body {
  margin: 0;
  background-color: #0f172a;
  color: #e5e7eb;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  padding: 24px;
}

h1 {
  margin: 0 0 24px;
  font-size: 24px;
  font-weight: 700;
}

/* =====================
   レイアウト
===================== */
.container {
  width: 100%;
  padding: 16px;
}

.login-form {
  background-color: #111827;
  max-width: 420px;
  margin: 0 auto;
  padding: 32px;
  border-radius: 5px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  font-size: 14px;
  margin-bottom: 6px;
  color: #cbd5f5;
}

input {
  width: 100%;
  padding: 12px;
  border-radius: 3px;
  border: none;
  background-color: #1f2937;
  color: #e5e7eb;
  font-size: 14px;
  line-height: 1.5;
}

input::placeholder {
  color: #9ca3af;
}

input:focus {
  outline: none;
  box-shadow: 0 0 0 2px #2563eb;
}

.btn-signin {
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  background-color: #2563eb;
  color: #ffffff;
  border: none;
  border-radius: 3px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

.btn-signin:hover {
  background-color: #1d4ed8;
}

.footer-text {
  margin-top: 20px;
  font-size: 14px;
  color: #9ca3af;
}

.footer-text a {
  color: #60a5fa;
  text-decoration: none;
  font-weight: 500;
}

.footer-text a:hover {
  text-decoration: underline;
}