* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", "Helvetica Neue", sans-serif;
  background: #0d0d0d;
  color: #fff;
  overflow-x: hidden;
  letter-spacing: 0.02em;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Space Grotesk", sans-serif;
}

/* 追加: 花火コンテナのスタイル */
.fireworks-container {
  position: fixed;
  /* 固定位置に設定 */
  top: 0;
  /* 上部に配置 */
  left: 0;
  /* 左端に配置 */
  width: 100%;
  /* 幅を100%に */
  height: 100%;
  /* 高さを100%に */
  pointer-events: none;
  /* クリックイベントを無効化 */
  z-index: 9999;
  /* 他の要素の上に表示 */
}

/* 変更: タイトルのスタイル */
.title-highlight {
  color: #4fd1c5;
  /* 白・黄以外で見やすいシアン系アクセント */
  font-size: 2rem;
  /* フォントサイズを大きく */
  margin: 20px 0;
  /* 上下のマージンを追加 */
  font-weight: bold;
  /* 太字に設定 */
}

/* title-highlight が .concept strong に上書きされないよう特異性を確保 */
.concept strong.title-highlight,
.title-highlight {
  color: #4fd1c5;
  /* 目的の色に */
}

nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(13, 13, 13, 0.95);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 136, 68, 0.2);
}

nav .logo {
  font-size: 1.5rem;
  font-weight: bold;
  background: linear-gradient(135deg, #ffdd55, #ff8844);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-image {
  height: 50px;
  width: auto;
  max-width: 200px;
  object-fit: contain;
  cursor: pointer;
  transition: filter 0.3s;
}

.logo-image:hover {
  filter: brightness(1.1) drop-shadow(0 0 10px rgba(255, 136, 68, 0.5));
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

nav a {
  color: #fff;
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.3s;
}

nav a:hover {
  color: #ff8844;
}

header {
  height: 100vh;
  background: #0a0a1a;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding-top: 60px;
  position: relative;
  overflow: hidden;
}

/* 背景用の夜空 */
header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%);
  z-index: -1;
}

/* 花火アニメーション用のコンテナ */
.fireworks-container {
  position: fixed;
  /* 固定位置に設定 */
  top: 0;
  /* 上部に配置 */
  left: 0;
  /* 左端に配置 */
  width: 100%;
  /* 幅を100%に */
  height: 100%;
  /* 高さを100%に */
  pointer-events: none;
  /* クリックイベントを無効化 */
  z-index: 9999;
  /* 他の要素の上に表示 */
}

.firework {
  position: absolute;
  pointer-events: none;
}

.particle {
  position: absolute;
  border-radius: 50%;
}

/* 花火のアニメーション */
@keyframes explode {
  0% {
    opacity: 1;
    transform: translate(0, 0) scale(1);
  }

  100% {
    opacity: 0;
    transform: translate(var(--tx), var(--ty)) scale(0);
  }
}

h1 {
  font-family: "Space Grotesk", sans-serif;
  font-size: 3.5rem;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  animation: fadeIn 2s ease;
  position: relative;
  z-index: 10;
}

p.subtitle {
  font-size: 1.2rem;
  margin-top: 1rem;
  opacity: 0.9;
  max-width: 700px;
  line-height: 1.7;
  animation: fadeIn 2.5s ease;
  position: relative;
  z-index: 10;
}

.mission-statement {
  font-family: "Space Grotesk", sans-serif;
  /* 英語のミッションステートメントにマッチ */
  font-size: 1.3rem;
  font-weight: 300;
  color: #ffdd55;
  /* 明るい黄色で花火の輝きを表現 */
  margin-top: 2rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  animation: fadeIn 3s ease;
  position: relative;
  z-index: 10;
  text-shadow: 0 0 8px rgba(255, 221, 85, 0.6);
  /* 輝きを追加 */
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section {
  padding: 100px 20px;
  max-width: 1000px;
  margin: auto;
}

.section h2 {
  font-size: 2.5rem;
  margin-bottom: 40px;
  border-left: 6px solid #ff8844;
  padding-left: 15px;
  text-align: left;
}

.concept {
  background: linear-gradient(135deg, rgba(255, 136, 68, 0.1), rgba(255, 51, 85, 0.1));
  border: 1px solid rgba(255, 136, 68, 0.3);
  border-radius: 16px;
  padding: 40px;
  line-height: 1.9;
  box-shadow: 0 0 25px rgba(255, 80, 120, 0.15);
}

.concept strong {
  color: #ffdd55;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.feature-card {
  background: #1a1a1a;
  border: 1px solid rgba(255, 136, 68, 0.2);
  border-radius: 12px;
  padding: 30px;
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(255, 136, 68, 0.2);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 15px;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: #ffdd55;
}

.feature-card p {
  font-size: 0.95rem;
  line-height: 1.6;
  opacity: 0.85;
}

.values-list {
  list-style: none;
  margin-top: 30px;
}

.values-list li {
  padding: 12px 0;
  padding-left: 30px;
  position: relative;
  font-size: 1.05rem;
  line-height: 1.8;
}

.values-list li:before {
  content: "✨";
  position: absolute;
  left: 0;
  color: #ff8844;
}

.cta-button {
  display: inline-block;
  margin-top: 40px;
  padding: 15px 40px;
  background: linear-gradient(135deg, #ff8844, #ff3355);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: bold;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 4px 15px rgba(255, 136, 68, 0.3);
}

.cta-button:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 25px rgba(255, 136, 68, 0.5);
}

footer {
  margin-top: 80px;
  padding: 60px 20px;
  text-align: center;
  border-top: 1px solid rgba(255, 136, 68, 0.2);
  opacity: 0.7;
  font-size: 0.9rem;
  background: #0a0a0a;
}

.company-info {
  background: #1a1a1a;
  border-radius: 12px;
  padding: 40px;
  margin-top: 20px;
  box-shadow: 0 0 15px rgba(255, 136, 68, 0.2);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.info-item {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  padding: 20px;
  transition: transform 0.3s;
}

.info-item:hover {
  transform: translateY(-3px);
}

.info-item h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: #ffdd55;
}

.info-item p {
  font-size: 0.95rem;
  line-height: 1.6;
  opacity: 0.9;
}

.founder-profile {
  background: #1a1a1a;
  border-radius: 12px;
  padding: 40px;
  margin-top: 20px;
  box-shadow: 0 0 15px rgba(255, 136, 68, 0.2);
}

.founder-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid #ff8844;
  margin: 0 auto 20px;
  display: block;
  box-shadow: 0 0 20px rgba(255, 136, 68, 0.3);
}

.founder-header {
  text-align: center;
  margin-bottom: 30px;
  padding-bottom: 30px;
  border-bottom: 2px solid rgba(255, 136, 68, 0.2);
}

.founder-header h3 {
  font-size: 1.8rem;
  margin-bottom: 5px;
  background: linear-gradient(135deg, #ffdd55, #ff8844);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.founder-bio {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 36px;
  margin-top: 20px;
  align-items: start;
}

.bio-block {
  padding-right: 10px;
  line-height: 1.8;
}

.skills-block {
  background: rgba(255, 136, 68, 0.03);
  border-left: 4px solid rgba(255, 136, 68, 0.15);
  padding: 18px 20px;
  border-radius: 8px;
}

.skills-block h4 {
  margin-top: 0;
  color: #ffdd55;
}

/* レスポンシブ */
@media (max-width: 880px) {
  .founder-bio {
    grid-template-columns: 1fr;
  }

  .skills-block {
    border-left: none;
    margin-top: 18px;
  }
}

@media (max-width: 768px) {
  nav ul {
    gap: 1rem;
    font-size: 0.85rem;
  }

  h1 {
    font-size: 2rem;
  }

  .section h2 {
    font-size: 1.8rem;
  }

  .concept {
    padding: 25px;
  }

  .founder-profile {
    padding: 25px;
  }
}