/* ------------------------------
   基本設定
------------------------------ */
body {
  margin: 0;
  font-family: "Segoe UI", "Hiragino Sans", sans-serif;
  background: #f7f7f7;
  color: #333;
  line-height: 1.7;
}

img {
  max-width: 100%;
  border-radius: 8px;
}

.container {
  width: 90%;
  max-width: 1080px;
  margin: auto;
}

/* ------------------------------
   ヘッダー
------------------------------ */
.site-header {
  background: #1e88e5;
  color: #fff;
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  margin: 0;
  font-size: 24px;
  font-weight: bold;
}

.site-nav ul {
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
  display: flex;
  gap: 20px;
}

.site-nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 600;
}

.site-nav a:hover {
  opacity: 0.8;
}

/* ------------------------------
   ヒーローセクション
------------------------------ */
.hero {
  background: linear-gradient(135deg, #42a5f5, #1e88e5);
  color: #fff;
  padding: 80px 0;
  text-align: center;
}

.hero h2 {
  font-size: 32px;
  margin-bottom: 20px;
}

.hero-actions {
  margin-top: 30px;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  margin: 5px;
}

.btn.primary {
  background: #fff;
  color: #1e88e5;
}

.btn.secondary {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.btn:hover {
  opacity: 0.85;
}

/* ------------------------------
   セクション共通
------------------------------ */
.section {
  padding: 60px 0;
}

.section.alt {
  background: #ffffff;
}

.section h3 {
  font-size: 28px;
  margin-bottom: 20px;
  text-align: center;
}

/* ------------------------------
   機能グリッド
------------------------------ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.feature-item {
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  border: 2px solid #e0e0e0;
  transition: 0.2s;
}

.feature-item:hover {
  border-color: #42a5f5;
  transform: translateY(-3px);
}

/* ------------------------------
   UI スクリーンショット
------------------------------ */
.ui-screenshots {
  display: flex;
  gap: 20px;
  margin-top: 30px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ------------------------------
   ダウンロード
------------------------------ */
.download-list {
  list-style: none;
  padding: 0;
  text-align: center;
}

.download-list li {
  margin: 10px 0;
}

.download-list a {
  color: #1e88e5;
  font-weight: bold;
  text-decoration: none;
}

.download-list a:hover {
  text-decoration: underline;
}

.note {
  text-align: center;
  margin-top: 10px;
  color: #666;
}

/* ------------------------------
   フッター
------------------------------ */
.site-footer {
  background: #1e88e5;
  color: #fff;
  text-align: center;
  padding: 20px 0;
  margin-top: 40px;
}