/* ==========================================================================
   共通CSS（リセット、基本スタイル、ユーティリティクラス）
   ========================================================================== */

/* リセットCSS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #fff;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: opacity 0.3s ease;
}

a:hover {
  opacity: 0.7;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* 基本スタイル */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 60px 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
}

.section-subtitle {
  font-size: 1.2rem;
  text-align: center;
  color: #666;
  margin-bottom: 40px;
}

/* ボタンスタイル */
.btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.btn-primary {
  background-color: #007bff;
  color: #fff;
}

.btn-primary:hover {
  background-color: #0056b3;
  opacity: 1;
}

.btn-secondary {
  background-color: #6c757d;
  color: #fff;
}

.btn-secondary:hover {
  background-color: #5a6268;
  opacity: 1;
}

.btn-outline {
  border: 2px solid #007bff;
  color: #007bff;
  background-color: transparent;
}

.btn-outline:hover {
  background-color: #007bff;
  color: #fff;
  opacity: 1;
}

/* カードスタイル */
.card {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-body {
  padding: 20px;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.card-text {
  font-size: 0.95rem;
  color: #666;
  margin-bottom: 15px;
}

/* グリッドレイアウト */
.grid {
  display: grid;
  gap: 30px;
}

.grid-col-1 {
  grid-template-columns: 1fr;
}

.grid-col-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-col-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ヘッダースタイル */
.header {
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.header-logo {
  font-size: 1.5rem;
  font-weight: 700;
}

.header-nav ul {
  display: flex;
  gap: 30px;
}

.header-nav a {
  font-size: 1rem;
  font-weight: 500;
}

/* フッタースタイル */
.footer {
  background-color: #333;
  color: #fff;
  padding: 40px 0;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 20px;
}

.footer-links a {
  color: #fff;
  font-size: 0.95rem;
}

.footer-copyright {
  font-size: 0.85rem;
  color: #aaa;
}

/* ユーティリティクラス */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }
.mt-40 { margin-top: 40px; }

.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }
.mb-40 { margin-bottom: 40px; }

.pt-10 { padding-top: 10px; }
.pt-20 { padding-top: 20px; }
.pt-30 { padding-top: 30px; }
.pt-40 { padding-top: 40px; }

.pb-10 { padding-bottom: 10px; }
.pb-20 { padding-bottom: 20px; }
.pb-30 { padding-bottom: 30px; }
.pb-40 { padding-bottom: 40px; }

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .section {
    padding: 40px 0;
  }

  .section-title {
    font-size: 1.5rem;
    margin-bottom: 30px;
  }

  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 30px;
  }

  .header-nav ul {
    flex-direction: column;
    gap: 15px;
  }

  .footer-links {
    flex-direction: column;
    gap: 15px;
  }

  .grid {
    gap: 20px;
  }
}

/* ハンバーガーメニュー */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.hamburger span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: #333;
  transition: all 0.3s ease;
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .header-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  }

  .header-nav.active {
    display: block;
  }

  .header-nav ul {
    padding: 20px;
  }
}