/* About Style */
        :root {
            --primary-color: #0e0d0b;
            --accent-color: #c2a36e;
            --secondary-color: #dfd6c9;
            --background: #fdfcfa;
            --text-light: rgba(14, 13, 11, 0.8);
            --golden-ratio: 1.618;
            --space-xs: 0.5rem;
            --space-sm: 1rem;
            --space-md: calc(1rem * 1.618);
            --space-lg: calc(1rem * 1.618 * 1.618);
            --space-xl: calc(1rem * 1.618 * 1.618 * 1.618);
            --font-base: clamp(1rem, 2.5vw, 1.125rem);
            --font-md: clamp(1.125rem, 3vw, 1.25rem);
            --font-lg: clamp(1.25rem, 3.5vw, 1.5rem);
            --font-xl: clamp(1.5rem, 4vw, 2rem);
            --font-2xl: clamp(2rem, 5vw, 3rem);
            --ease: cubic-bezier(0.25, 1, 0.5, 1);
            --fade-delay-unit: 0.15s;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Noto Serif JP', 'Crimson Text', serif;
            background-color: var(--background);
            color: var(--primary-color);
            line-height: 1.8;
            overflow-x: hidden;
            width: 100%;
        }

        /* Progress Bar */
        .progress-bar {
            position: fixed;
            top: 0;
            left: 0;
            width: 0%;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-color), #daa520);
            z-index: 9999;
            transition: width 0.1s ease;
        }

        /* Header */
        header {
            position: absolute; /* ヒーローセクションの上に配置 */
            top: 0;
            left: 0;
            width: 100%;
            z-index: 100; /* スクロールバーより下、ヒーローより上 */
            padding: var(--space-md) 0;
        }

        .header-nav ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            justify-content: center; /* 中央寄せ */
            flex-wrap: wrap;
            gap: var(--space-md);
        }

        .header-nav a {
            color: var(--primary-color); /* フッターと色を変更 */
            text-decoration: none;
            font-size: var(--font-base);
            font-family: 'Crimson Text', serif; /* 英語なのでフォント指定 */
            font-weight: 600;
            opacity: 0.8;
            transition: opacity 0.3s ease;
        }

        .header-nav a:hover {
            opacity: 1;
            text-decoration: underline;
        }



    /* メインビジュアル */
    .main-visual-join {
      position: relative;
      width: 100%;
      min-height: 70vh;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
      background: linear-gradient(135deg, var(--background) 0%, #f9f7f4 100%);
      padding-top: calc(var(--space-xl) + var(--space-lg));
    }
    
    .main-visual-join video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
  opacity: 0.7;
  pointer-events: none;
  transform: translateZ(0); /* パララックス用 */
  will-change: transform; /* パフォーマンス最適化 */
}
    
/* 未来都市的なグリッド背景 */
.main-visual-join::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  background-image: 
    linear-gradient(rgba(194, 163, 110, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(194, 163, 110, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  opacity: 0.5;
  pointer-events: none;
  animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
  0% { transform: translateY(0); }
  100% { transform: translateY(50px); }
}



    /* particles.jsコンテナ - 必ず高さを指定 */

#particles-js {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  pointer-events: none;
}

/* canvasが確実に表示されるように */
#particles-js canvas {
  display: block !important;
  width: 100% !important;
  height: 100% !important;
}
    
    /* CSSフォールバックアニメーション */
    .main-visual-join .css-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 2;
      pointer-events: none;
      opacity: 0.5;
    }
    
    .particle {
      position: absolute;
      background: radial-gradient(circle, rgba(194, 163, 110, 0.6) 0%, transparent 70%);
      border-radius: 50%;
      animation: float 8s ease-in-out infinite;
    }
    
    @keyframes float {
      0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.3;
      }
      50% {
        transform: translate(20px, -30px) scale(1.1);
        opacity: 0.6;
      }
    }
    
    /* 各パーティクルの個別設定 */
    .particle:nth-child(1) { width: 3px; height: 3px; top: 20%; left: 10%; animation-delay: 0s; animation-duration: 7s; }
    .particle:nth-child(2) { width: 4px; height: 4px; top: 40%; left: 30%; animation-delay: 1s; animation-duration: 9s; }
    .particle:nth-child(3) { width: 2px; height: 2px; top: 60%; left: 50%; animation-delay: 2s; animation-duration: 6s; }
    .particle:nth-child(4) { width: 5px; height: 5px; top: 80%; left: 70%; animation-delay: 0.5s; animation-duration: 8s; }
    .particle:nth-child(5) { width: 3px; height: 3px; top: 30%; left: 80%; animation-delay: 1.5s; animation-duration: 7.5s; }
    .particle:nth-child(6) { width: 4px; height: 4px; top: 50%; left: 20%; animation-delay: 2.5s; animation-duration: 8.5s; }
    .particle:nth-child(7) { width: 2px; height: 2px; top: 70%; left: 40%; animation-delay: 3s; animation-duration: 6.5s; }
    .particle:nth-child(8) { width: 3px; height: 3px; top: 15%; left: 60%; animation-delay: 3.5s; animation-duration: 7s; }
    .particle:nth-child(9) { width: 4px; height: 4px; top: 45%; left: 85%; animation-delay: 4s; animation-duration: 9s; }
    .particle:nth-child(10) { width: 2px; height: 2px; top: 65%; left: 15%; animation-delay: 4.5s; animation-duration: 6s; }
    .particle:nth-child(11) { width: 5px; height: 5px; top: 85%; left: 35%; animation-delay: 5s; animation-duration: 8s; }
    .particle:nth-child(12) { width: 3px; height: 3px; top: 25%; left: 55%; animation-delay: 5.5s; animation-duration: 7.5s; }
    
    .main-visual-text-join {
      position: relative;
      z-index: 3;
      text-align: center;
      padding: var(--space-lg);
      max-width: 900px;
    }
    

/* メインビジュアルテキストに熱さを追加 */
.main-visual-text-join h1 {
  background: linear-gradient(135deg, #0e0d0b 0%, #c2a36e 50%, #0e0d0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% auto;
  animation: shimmer 8s ease-in-out infinite;
}

@keyframes shimmer {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}



        /* Main Container */


        .section {
            padding: var(--space-xl) var(--space-md);
            opacity: 0;
            transform: translateY(30px);
            transition: all 1.2s var(--ease);
        }

        .section.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
        }

        /* Hero Section */
        .hero-section {
            padding: calc(var(--space-xl) * 2) var(--space-md);
            background: linear-gradient(135deg, var(--background) 0%, #f9f7f4 100%);
            text-align: center;
            min-height: 70vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .hero-headline {
            font-size: clamp(2.5rem, 10vw, 6rem);
            font-weight: 900;
            line-height: 1.2;
            color: var(--primary-color);
            animation: fadeInUp 1.5s var(--ease) 0.5s both;
        }

        .hero-text {
            max-width: 900px;
            margin: 0 auto;
            font-size: clamp(2.3rem, 9vw, 6rem);
        }

        .hero-text p {
            font-size: clamp(1.1rem, 3.5vw, 1.8rem);
            line-height: 2.0;
            margin-bottom: var(--space-sm);
            opacity: 0;
            transform: translateY(20px);
            transition: all 0.8s var(--ease);
        }

        .hero-text.visible h1 {
            opacity: 1;
            transform: translateY(0);
        }

        .hero-text.visible h1:nth-child(1) { transition-delay: 0.1s; }
        .hero-text.visible h1:nth-child(2) { transition-delay: 0.4s; }
        .hero-text.visible h1:nth-child(5) { transition-delay: 0.7s; }
        .hero-text.visible h1:nth-child(6) { transition-delay: 1s; }
        .hero-text.visible h1:nth-child(9) { transition-delay: 1.3s; }
        .hero-text.visible h1:nth-child(10) { transition-delay: 1.6s; }

        .hero-text h1.empty {
            height: var(--space-md);
        }


        /* Opening Section */
        .opening-section {
            padding: calc(var(--space-xl) * 2) var(--space-md);
        }

        .opening-text {
            max-width: 700px;
            margin: 0 auto;
        }

        .opening-text p {
            font-size: clamp(1.1rem, 3.5vw, 1.8rem);
            line-height: 2.0;
            margin-bottom: var(--space-sm);
            opacity: 0;
            transform: translateY(20px);
            transition: all 0.8s var(--ease);
        }

        .opening-text.visible p {
            opacity: 1;
            transform: translateY(0);
        }

        .opening-text.visible p:nth-child(1) { transition-delay: 0.1s; }
        .opening-text.visible p:nth-child(2) { transition-delay: 0.4s; }
        .opening-text.visible p:nth-child(5) { transition-delay: 1.3s; }
        .opening-text.visible p:nth-child(6) { transition-delay: 1.6s; }
        .opening-text.visible p:nth-child(9) { transition-delay: 2.5s; }
        .opening-text.visible p:nth-child(10) { transition-delay: 2.8s; }

        .opening-text p.empty {
            height: var(--space-md);
        }

        /* Five Paths Section */
        .paths-section {
            padding: calc(var(--space-xl) * 2) var(--space-md);
            background: var(--background);
        }

        .section-title {
            font-size: var(--font-2xl);
            font-weight: 700;
            text-align: center;
            margin-bottom: var(--space-md);
            color: var(--primary-color);
        }

        .section-subtitle {
            font-size: var(--font-lg);
            text-align: center;
            margin-bottom: calc(var(--space-xl) * 1.5);
            color: var(--text-light);
            font-style: italic;
        }

        .paths-container {
            display: grid;
            gap: var(--space-md);
            margin-bottom: calc(var(--space-xl) * 1.5);
        }

        .path-item {
            padding: var(--space-lg);
            border: 1px solid rgba(194, 163, 110, 0.2);
            border-radius: 8px;
            background: rgba(253, 252, 250, 0.5);
            transition: all 0.6s var(--ease);
            opacity: 0;
            transform: translateX(-50px);
        }

        .paths-container.visible .path-item {
            opacity: 1;
            transform: translateX(0);
        }

        .paths-container.visible .path-item:nth-child(1) { transition-delay: 0.3s; }
        .paths-container.visible .path-item:nth-child(2) { transition-delay: 0.6s; }
        .paths-container.visible .path-item:nth-child(3) { transition-delay: 0.9s; }
        .paths-container.visible .path-item:nth-child(4) { transition-delay: 1.2s; }
        .paths-container.visible .path-item:nth-child(5) { transition-delay: 1.5s; }

        .path-item:hover {
            background: rgba(194, 163, 110, 0.1);
            transform: translateX(10px);
            border-color: var(--accent-color);
        }

        .path-name {
            font-size: var(--font-xl);
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: var(--space-sm);
        }

        .path-description {
            font-size: var(--font-base);
            color: var(--text-light);
            line-height: 1.8;
        }

        .paths-closing {
            text-align: center;
            font-size: var(--font-lg);
            font-style: italic;
            color: var(--accent-color);
            margin-top: var(--space-xl);
        }

        /* Founder Message Section */
        .founder-section {
            padding: calc(var(--space-xl) * 2) var(--space-md);
            background: linear-gradient(135deg, #f9f7f4 0%, var(--secondary-color) 100%);
        }

        .founder-message {
            max-width: 750px;
            margin: 0 auto;
        }

        .founder-message p {
            font-size: clamp(1rem, 3vw, 1.5rem);
            line-height: 1.9;
            margin-bottom: var(--space-sm);
            opacity: 0;
            transform: translateX(-30px);
            transition: all 0.8s var(--ease);
        }

        .founder-message p.empty {
            height: var(--space-md);
        }

        .founder-message p.emphasis {
            font-size: clamp(1.5rem, 4vw, 2.2rem);
            font-weight: 700;
            color: var(--primary-color);
            margin-top: var(--space-lg);
        }

        .founder-message.visible p {
            opacity: 1;
            transform: translateX(0);
        }

        .founder-message.visible p:nth-child(1) { transition-delay: 0.4s; }
        .founder-message.visible p:nth-child(2) { transition-delay: 1.2s; }
        .founder-message.visible p:nth-child(3) { transition-delay: 1.6s; }
        .founder-message.visible p:nth-child(4) { transition-delay: 2,0s; }
        .founder-message.visible p:nth-child(5) { transition-delay: 2.0s; }
        .founder-message.visible p:nth-child(6) { transition-delay: 2.8s; }
        .founder-message.visible p:nth-child(7) { transition-delay: 3.2s; }
        .founder-message.visible p:nth-child(8) { transition-delay: 3.6s; }
        .founder-message.visible p:nth-child(9) { transition-delay: 4.0s; }
        .founder-message.visible p:nth-child(10) { transition-delay: 4.4s; }
        .founder-message.visible p:nth-child(11) { transition-delay: 4.8s; }
        .founder-message.visible p:nth-child(12) { transition-delay: 5.2s; }
        .founder-message.visible p:nth-child(13) { transition-delay: 5.6s; }
        .founder-message.visible p:nth-child(14) { transition-delay: 6.0s; }
        .founder-message.visible p:nth-child(15) { transition-delay: 6.4s; }
        .founder-message.visible p:nth-child(16) { transition-delay: 6.8s; }


        .founder-message p.empty {
            height: var(--space-md);
        }


        /* Tribal Purpose Section */
        .purpose-section {
            padding: calc(var(--space-xl) * 2) var(--space-md);
            background: var(--background);
        }

        .purpose-content {
            max-width: 650px;
            margin: 0 auto;
        }

        .purpose-content p {
            font-size: clamp(1.1rem, 3.2vw, 1.7rem);
            line-height: 2.2;
            margin-bottom: var(--space-md);
            padding-left: var(--space-md);
          /*  border-left: 3px solid var(--accent-color); */
            opacity: 0;
            transform: translateX(-30px);
            transition: all 0.8s var(--ease);
        }

        .purpose-content.visible p {
            opacity: 1;
            transform: translateX(0);
        }

        .purpose-content.visible p:nth-child(2) { transition-delay: 0.6s; }
        .purpose-content.visible p:nth-child(3) { transition-delay: 1.2s; }
        .purpose-content.visible p:nth-child(4) { transition-delay: 1.6s; }
        .purpose-content.visible p:nth-child(5) { transition-delay: 2.0s; }
        .purpose-content.visible p:nth-child(6) { transition-delay: 2.4s; }
        .purpose-content.visible p:nth-child(7) { transition-delay: 2.8s; }
        .purpose-content.visible p:nth-child(8) { transition-delay: 3.2s; }
        .purpose-content.visible p:nth-child(9) { transition-delay: 3.6s; }

        .purpose-content p.empty {
            height: var(--space-md);
        }


        /* Elemental Section */
        .elemental-section {
            padding: calc(var(--space-xl) * 3) var(--space-md);
            background: radial-gradient(circle at center, var(--secondary-color) 0%, var(--background) 100%);
            text-align: center;
        }

        .elemental-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .elemental-line {
            font-size: clamp(1.8rem, 5vw, 3rem);
            line-height: 3.0;
            color: var(--primary-color);
            opacity: 0;
            transition: all 1s var(--ease);
        }

        .elemental-content.visible .elemental-line {
            opacity: 1;
        }

        .elemental-line.wind {
            transform: translateX(-100px);
        }

        .elemental-content.visible .elemental-line.wind {
            transform: translateX(0);
            transition-delay: 0.6s;
        }

        .elemental-line.fire {
            transform: translateY(50px) scale(0.8);
        }

        .elemental-content.visible .elemental-line.fire {
            transform: translateY(0) scale(1);
            transition-delay: 1.2s;
        }

        .elemental-line.water {
            transform: translateX(100px);
        }

        .elemental-content.visible .elemental-line.water {
            transform: translateX(0);
            transition-delay: 1.8s;
        }

        .elemental-line.earth {
            transform: translateY(50px);
            font-weight: 700;
        }

        .elemental-content.visible .elemental-line.earth {
            transform: translateY(0);
            transition-delay: 2.4s;
        }

        .elemental-line.calling {
            font-size: clamp(2rem, 6vw, 3.5rem);
            font-weight: 700;
            color: var(--accent-color);
            margin-top: var(--space-xl);
            transform: scale(0.5);
            text-shadow: 0 0 30px rgba(194, 163, 110, 0.3);
        }

        .elemental-content.visible .elemental-line.calling {
            transform: scale(1);
            transition-delay: 3.5s;
            animation: glow 4s ease-in-out infinite 4s;
        }

        @keyframes glow {
            0%, 100% {
                text-shadow: 0 0 20px rgba(194, 163, 110, 0.3);
            }
            50% {
                text-shadow: 0 0 40px rgba(194, 163, 110, 0.6);
            }
        }

        /* Final Message Section */
        .final-section {
            padding: calc(var(--space-xl) * 3) var(--space-md);
            background: linear-gradient(135deg, var(--primary-color) 0%, #2a2823 100%);
            text-align: center;
            min-height: 60vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .final-message {
            font-size: clamp(2.5rem, 8vw, 5rem);
            font-weight: 900;
            line-height: 1.2;
            background: linear-gradient(90deg, var(--accent-color), #daa520, var(--accent-color));
            background-size: 200% auto;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            opacity: 0;
            transform: scale(0.5) rotate(-5deg);
            transition: all 4s var(--ease);
        }

        .final-section.visible .final-message {
            opacity: 1;
            transform: scale(1) rotate(0deg);
            animation: shimmer 6s linear infinite 4s;
        }

        @keyframes shimmer {
            0% {
                background-position: 0% center;
            }
            100% {
                background-position: 200% center;
            }
        }

        /* Footer */
        footer {
            padding: var(--space-xl) 0;
            text-align: center;
            background-color: var(--primary-color);
            color: var(--secondary-color);
        }
        
        .footer-nav {
            margin-bottom: var(--space-md);
        }

        .footer-nav ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            justify-content: center;
            flex-wrap: wrap; /* モバイルでの折り返し対応 */
            gap: var(--space-md);
        }

        .footer-nav a {
            color: var(--secondary-color);
            text-decoration: none;
            font-size: var(--font-base);
            opacity: 0.8;
            transition: opacity 0.3s ease;
        }

        .footer-nav a:hover {
            opacity: 1;
            text-decoration: underline;
        }
        /* ======================== */
        
        .footer-text {
            font-size: var(--font-base);
            opacity: 0.8;
        }

        .copyright {
            font-size: var(--font-base);
            opacity: 0.7;
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(40px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            nav {
                gap: var(--space-md);
            }

            nav a {
                font-size: clamp(0.875rem, 3vw, 1rem);
            }

            .hero-headline {
                font-size: clamp(1.8rem, 8vw, 3rem);
            }

            .opening-text p {
                font-size: clamp(1rem, 4vw, 1.3rem);
                line-height: 1.8;
            }

            .section {
                padding: var(--space-lg) var(--space-sm);
            }

            .hero-section,
            .opening-section,
            .paths-section,
            .founder-section,
            .purpose-section,
            .elemental-section,
            .final-section {
                padding: var(--space-xl) var(--space-sm);
            }



            .path-item {
                padding: var(--space-md);
            }

            .elemental-line {
                line-height: 2.5;
            }

            .footer-nav {
                gap: var(--space-md);
            }
        }



        /* デフォルト（PC/広い画面）での設定 */
        .only-sp {
        /* 最初は表示しない (スマホ以外では非表示) */
            display: none; 
            }

/* 画面幅が600px以下の場合 (スマートフォンなど) */
@media (max-width: 600px) {
    .only-sp {
        /* 600px以下になったら表示する */
        display: inline; 
    line-height:50%;
    }
}



        @media (max-width: 480px) {
            header {
                padding: var(--space-sm) var(--space-md);
            }

            nav {
                gap: var(--space-sm);
            }

            .hero-headline {
                font-size: clamp(1.5rem, 9vw, 2.5rem);
            }

            .final-message {
                font-size: clamp(2rem, 9vw, 3rem);
            }

            .elemental-line.calling {
                font-size: clamp(1.5rem, 7vw, 2.5rem);
            }
        }