/* リセットとベーススタイル */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ページローダー */
.page-loader {
  position: fixed;
  inset: 0;
  background: #000;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 99999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.page-loader img {
  width: 120px;
  height: auto;
  position: relative;
  z-index: 2;
}

.loader-ripple-container {
  position: absolute;
  width: 200px;
  height: 200px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.loader-ripple {
  position: absolute;
  width: 140px;
  height: 140px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  animation: loaderRipple 2s ease-out infinite;
}

.loader-ripple:nth-child(2) {
  animation-delay: 0.5s;
}

.loader-ripple:nth-child(3) {
  animation-delay: 1s;
}

@keyframes loaderRipple {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  100% {
    transform: scale(3);
    opacity: 0;
  }
}

/* PC版ローダーサイズ */
@media (min-width: 769px) {
  .page-loader img {
    width: 180px;
  }

  .loader-ripple-container {
    width: 300px;
    height: 300px;
  }

  .loader-ripple {
    width: 200px;
    height: 200px;
  }
}

:root {
  --primary-color: #000000;
  --secondary-color: #666666;
  --dark-gray: #32373c;
  --light-gray: #f5f5f5;
  --white: #FFFFFF;
  --text-color: #333333;
  --border-color: #e0e0e0;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  color: var(--text-color);
  line-height: 1.8;
  background-color: var(--white);
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul, ol {
  list-style: none;
}

/* PC版・SP版 改行タグ */
.br-pc {
  display: none;
}

.br-sp {
  display: inline;
}

@media (min-width: 769px) {
  .br-pc {
    display: inline;
  }
  .br-sp {
    display: none;
  }
}

/* ヘッダー */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: transparent;
  box-shadow: none;
  z-index: 1000;
  transition: background-color 0.3s ease;
}

.header.scrolled {
  background-color: rgba(0, 0, 0, 0.8);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.2rem 3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.05em;
}

.logo-img {
  width: 220px;
  height: 70px;
  background-image: url('../images/sousou_logo.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

.nav-menu {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.nav-menu a {
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--white);
  position: relative;
  padding: 0.5rem 0;
}

.nav-menu a:hover {
  opacity: 0.7;
}

.nav-menu .btn {
  padding: 0.6rem 1.8rem;
  font-size: 0.9rem;
}

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

.hamburger span {
  width: 28px;
  height: 2px;
  background-color: var(--white);
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(7px, 7px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* コンテナ */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 3rem;
}

.section {
  padding: 6rem 0;
}

.section-title {
  font-size: 2.8rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
  letter-spacing: 0.05em;
}

.section-subtitle {
  text-align: center;
  color: var(--secondary-color);
  margin-bottom: 4rem;
  font-size: 1rem;
  letter-spacing: 0.1em;
}

/* ボタン */
.btn {
  display: inline-block;
  padding: 1rem 2.8rem;
  background-color: var(--dark-gray);
  color: var(--white);
  border-radius: 4px;
  font-weight: 500;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  text-align: center;
  font-size: 0.95rem;
}

.btn:hover {
  background-color: var(--primary-color);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: var(--white);
}

/* カード */
.card {
  background-color: var(--white);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  opacity: 0.9;
}

.card-img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.card-content {
  padding: 1.5rem 0;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
  color: var(--primary-color);
}

.card-text {
  color: var(--secondary-color);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* グリッドレイアウト */
.grid {
  display: grid;
  gap: 3rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* フッター */
.footer {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-section h3 {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.footer-logo {
  width: 150px;
  height: 60px;
  background-image: url('../images/sousou_logo.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: left center;
  margin-bottom: 1.5rem;
}

.footer-section ul {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-section a {
  font-size: 0.9rem;
  opacity: 0.8;
}

.footer-section a:hover {
  opacity: 1;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.85rem;
}

.footer-social {
  display: flex;
  gap: 1.5rem;
  margin-top: 1rem;
}

.footer-social a {
  color: var(--white);
  font-size: 0.9rem;
  opacity: 0.8;
  transition: var(--transition);
}

.footer-social a:hover {
  opacity: 1;
}

.footer-social a {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.social-icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
  display: inline-block;
  vertical-align: middle;
}

/* スクロールアニメーション */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.active {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.active {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.active {
  opacity: 1;
  transform: translateX(0);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .header-container {
    padding: 1rem 1.5rem;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    right: -100%;
    width: 80%;
    height: calc(100vh - 70px);
    background-color: #ffffff;
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
    transition: right 0.3s ease;
    gap: 2rem;
  }

  .nav-menu a {
    color: var(--primary-color);
  }

  .nav-menu.active {
    right: 0;
  }

  .hamburger {
    display: flex;
  }

  .section {
    padding: 4rem 0;
  }

  .section-title {
    font-size: 2rem;
  }

  .container {
    padding: 0 1.5rem;
  }

  .grid {
    gap: 2rem;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .section-title {
    font-size: 1.8rem;
  }

  .btn {
    padding: 0.9rem 2rem;
    font-size: 0.9rem;
  }

  .logo-img {
    width: 160px;
    height: 55px;
  }

  .footer-logo {
    width: 120px;
    height: 50px;
  }

  .container {
    padding: 0 1rem;
  }
}