/* ===========================
   リセット・共通
=========================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Hiragino Sans', 'Meiryo', sans-serif;
  font-size: 16px;
  color: #333;
  background: #f5f5f5;
  line-height: 1.7;
}

a {
  color: #2a6496;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===========================
   ヘッダー
=========================== */
.site-header {
  background: #333;
  color: #fff;
  padding: 12px 0;
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title a {
  color: #fff;
  font-size: 1.2rem;
  font-weight: bold;
}

.site-header nav ul {
  list-style: none;
  display: flex;
  gap: 24px;
}

.site-header nav a {
  color: #ccc;
  font-size: 0.95rem;
}

.site-header nav a:hover {
  color: #fff;
  text-decoration: none;
}

/* ===========================
   メインコンテンツ
=========================== */
.site-main {
  max-width: 800px;
  margin: 40px auto;
  padding: 0 20px;
}

/* ===========================
   フォーム
=========================== */
h1 {
  font-size: 1.4rem;
  border-bottom: 2px solid #333;
  padding-bottom: 8px;
  margin-bottom: 24px;
}

label {
  display: block;
  margin-top: 16px;
  font-weight: bold;
}

input,
textarea {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}

textarea {
  height: 120px;
  resize: vertical;
}

button {
  margin-top: 20px;
  padding: 10px 30px;
  background: #333;
  color: #fff;
  border: none;
  font-size: 1rem;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background: #555;
}

/* ===========================
   エラー・完了メッセージ
=========================== */
.error {
  color: #c0392b;
  font-size: 0.9rem;
  margin-top: 4px;
}

.box {
  background: #f0f8ff;
  border: 1px solid #99c;
  border-radius: 4px;
  padding: 20px;
  margin-top: 20px;
}

/* ===========================
   フッター
=========================== */
.site-footer {
  background: #333;
  color: #aaa;
  text-align: center;
  padding: 16px 0;
  margin-top: 60px;
  font-size: 0.85rem;
}