/* Reset & Base Styles */
    *, *::before, *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
      }
  
      body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        line-height: 1.5;
        color: #333;
        background-color: #f9fafb;
        overflow-x: hidden;
      }

      body.modal-open {
        overflow: hidden !important;
        height: 100% !important;
      }
  
      /* Typography */
      h1, h2, h3, h4, h5, h6 {
        margin-bottom: 0.5rem;
        font-weight: 700;
        line-height: 1.2;
      }
  
      p {
        margin-bottom: 1rem;
      }
  
      /* Layout */
      .container {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 1rem;
      }
  
      .relative {
        position: relative;
      }
  
      .absolute {
        position: absolute;
      }
  
      .fixed {
        position: fixed;
      }
  
      .inset-0 {
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
      }
  
      .z-0 {
        z-index: 0;
      }
  
      .z-10 {
        z-index: 10;
      }
  
      .z-50 {
        z-index: 50;
      }
  
      /* Flex & Grid */
      .flex {
        display: flex;
      }
  
      .items-center {
        align-items: center;
      }
  
      .justify-center {
        justify-content: center;
      }
  
      .justify-between {
        justify-content: space-between;
      }
  
      .flex-col {
        flex-direction: column;
      }
  
      .flex-wrap {
        flex-wrap: wrap;
      }
  
      .grid {
        display: grid;
      }
  
      .grid-cols-1 {
        grid-template-columns: repeat(1, minmax(0, 1fr));
      }
  
      @media (min-width: 768px) {
        .grid-cols-md-2 {
          grid-template-columns: repeat(2, minmax(0, 1fr));
        }
        
        .grid-cols-md-3 {
          grid-template-columns: repeat(3, minmax(0, 1fr));
        }
      }
  
      .gap-8 {
        gap: 2rem;
      }
  
      .gap-4 {
        gap: 1rem;
      }
  
      .gap-2 {
        gap: 0.5rem;
      }
  
      /* Spacing */
      .p-8 {
        padding: 2rem;
      }
  
      .p-4 {
        padding: 1rem;
      }
  
      .px-4 {
        padding-left: 1rem;
        padding-right: 1rem;
      }
  
      .py-20 {
        padding-top: 5rem;
        padding-bottom: 5rem;
      }
  
      .py-10 {
        padding-top: 2.5rem;
        padding-bottom: 2.5rem;
      }
  
      .py-3 {
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
      }
  
      .py-4 {
        padding-top: 1rem;
        padding-bottom: 1rem;
      }
  
      .px-8 {
        padding-left: 2rem;
        padding-right: 2rem;
      }
  
      .px-10 {
        padding-left: 2.5rem;
        padding-right: 2.5rem;
      }
  
      .mb-6 {
        margin-bottom: 1.5rem;
      }
  
      .mb-4 {
        margin-bottom: 1rem;
      }
  
      .mb-10 {
        margin-bottom: 2.5rem;
      }
  
      .mb-16 {
        margin-bottom: 4rem;
      }
  
      .mb-3 {
        margin-bottom: 0.75rem;
      }
  
      .mt-4 {
        margin-top: 1rem;
      }
  
      .mt-6 {
        margin-top: 1.5rem;
      }
  
      .mt-3 {
        margin-top: 0.75rem;
      }
  
      .mr-2 {
        margin-right: 0.5rem;
      }
  
      .mr-3 {
        margin-right: 0.75rem;
      }
  
      .ml-2 {
        margin-left: 0.5rem;
      }
  
      .mx-auto {
        margin-left: auto;
        margin-right: auto;
      }
  
      /* Sizes */
      .w-full {
        width: 100%;
      }
  
      .max-w-md {
        max-width: 28rem;
      }
  
      .max-w-4xl {
        max-width: 56rem;
      }
  
      .max-w-6xl {
        max-width: 72rem;
      }
  
      .h-screen {
        height: 100vh;
      }
  
      .min-h-screen {
        min-height: 100vh;
      }
  
      .h-48 {
        height: 12rem;
      }
  
      .h-5 {
        height: 1.25rem;
      }
  
      .w-5 {
        width: 1.25rem;
      }
  
      .h-12 {
        height: 3rem;
      }
  
      .w-12 {
        width: 3rem;
      }
  
      .h-16 {
        height: 4rem;
      }
  
      .w-16 {
        width: 4rem;
      }
  
      .h-8 {
        height: 2rem;
      }
  
      .w-8 {
        width: 2rem;
      }
  
      /* Colors */
      .bg-black {
        background-color: #000;
      }
  
      .bg-white {
        background-color: #fff;
      }
  
      .bg-gray-50 {
        background-color: #f9fafb;
      }
  
      .bg-gray-100 {
        background-color: #f3f4f6;
      }
  
      .bg-gray-900 {
        background-color: #111827;
      }
  
      .bg-green-100 {
        background-color: #dcfce7;
      }
  
      .bg-green-500 {
        background-color: #06C755;
      }
  
      .bg-green-600 {
        background-color: #05a847;
      }
  
      .bg-red-500 {
        background-color: #ef4444;
      }
  
      .bg-red-600 {
        background-color: #dc2626;
      }
  
      .text-white {
        color: #fff;
      }
  
      .text-gray-200 {
        color: #e5e7eb;
      }
  
      .text-gray-300 {
        color: #d1d5db;
      }
  
      .text-gray-400 {
        color: #9ca3af;
      }
  
      .text-gray-500 {
        color: #6b7280;
      }
  
      .text-gray-600 {
        color: #4b5563;
      }
  
      .text-green-400 {
        color: #4ade80;
      }
  
      .text-green-500 {
        color: #06C755;
      }
  
      .text-green-600 {
        color: #16a34a;
      }
  
      /* Typography */
      .text-center {
        text-align: center;
      }
  
      .text-xs {
        font-size: 0.75rem;
      }
  
      .text-sm {
        font-size: 0.875rem;
      }
  
      .text-lg {
        font-size: 1.125rem !important;
      }
  
      .text-xl {
        font-size: 1.25rem !important;
      }
  
      .text-2xl {
        font-size: 1.5rem;
      }
  
      .text-4xl {
        font-size: 2.25rem;
      }
  
      .text-5xl {
        font-size: 3rem;
      }
  
      @media (min-width: 768px) {
        .text-md-7xl {
          font-size: 4.5rem;
        }
        
        .text-md-2xl {
          font-size: 1.5rem;
        }
      }
  
      .font-bold {
        font-weight: 700;
      }
  
      /* Borders & Shadows */
      .rounded-lg {
        border-radius: 0.5rem;
      }
  
      .rounded-full {
        border-radius: 9999px;
      }
  
      .shadow-md {
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
      }
  
      .shadow-xl {
        box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
      }
  
      .shadow-2xl {
        box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
      }
  
      /* Buttons */
      .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border: none;
        font-size: 1.8rem;
        font-weight: 700;
        cursor: pointer;
        transition: background-color 0.3s, transform 0.2s;
        text-decoration: none;
      }
  
      .btn:hover {
        transform: translateY(-2px);
      }
  
      .btn:disabled {
        opacity: 0.5;
        cursor: not-allowed;
      }
  
      .btn-green {
        background-color: #06C755;
        color: white;
      }
  
      .btn-green:hover {
        background-color: #05a847;
      }
  
      .btn-red {
        background-color: #ef4444;
        color: white;
      }
  
      .btn-red:hover {
        background-color: #dc2626;
      }
  
      .btn-lg {
        padding: 1rem 2.5rem;
        font-size: 1.125rem;
      }
  
      .auth-btn{
        font-size:1.2rem;
      }

      /* Cards */
      .card {
        background-color: white;
        border-radius: 0.5rem;
        overflow: hidden;
        transition: box-shadow 0.3s;
        box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
      }
  
      .card-header {
        padding: 1.5rem 1.5rem 0.5rem;
      }
  
      .card-content {
        padding: 1rem 1.5rem;
      }
  
      .card-footer {
        padding: 1rem 1.5rem 1.5rem;
      }
  
      /* Badges */
      .badge {
        display: inline-block;
        padding: 0.25rem 0.75rem;
        border-radius: 9999px;
        font-size: 0.75rem;
        background-color: #f3f4f6;
        border: 1px solid #e5e7eb;
      }
  
      /* Utilities */
      .overflow-hidden {
        overflow: hidden;
      }
  
      .bg-cover {
        background-size: cover;
      }
  
      .bg-center {
        background-position: center;
      }
  
      .bg-opacity-60 {
        background-color: rgba(0, 0, 0, 0.6);
      }
  
      .bg-opacity-70 {
        background-color: rgba(0, 0, 0, 0.7);
      }
  
      .bg-opacity-90 {
        background-color: rgba(0, 0, 0, 0.9);
      }
  
      .transition-shadow {
        transition-property: box-shadow;
        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        transition-duration: 300ms;
      }
  
      .transition-transform {
        transition-property: transform;
        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        transition-duration: 500ms;
      }
  
      .transition-colors {
        transition-property: color, background-color, border-color;
        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        transition-duration: 300ms;
      }
  
      .hover\:scale-105:hover {
        transform: scale(1.05);
      }
  
      .hover\:text-white:hover {
        color: white;
      }
  
      .space-x-4 > * + * {
        margin-left: 1rem;
      }
  
      /* Animations */
      @keyframes fadeIn {
        from { opacity: 0; transform: translateY(20px); }
        to { opacity: 1; transform: translateY(0); }
      }
  
      @keyframes spin {
        from { transform: rotate(0deg); }
        to { transform: rotate(360deg); }
      }
  
      .animate-spin {
        animation: spin 1s linear infinite;
      }
  
      .animate-fade-in {
        animation: fadeIn 0.8s ease forwards;
      }
  
      .animate-fade-in-delay-1 {
        opacity: 0;
        animation: fadeIn 0.8s ease forwards;
        animation-delay: 0.2s;
      }
  
      .animate-fade-in-delay-2 {
        opacity: 0;
        animation: fadeIn 0.8s ease forwards;
        animation-delay: 0.4s;
      }
  
      /* Authentication Overlay */
      #auth-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5); 
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 50;
        transition: opacity 0.5s ease;
      }
      
      /* 中央に表示するボックス（例） */
      #auth-overlay .auth-box {
        width: 90%;
      }
  
      #auth-overlay.hidden {
        opacity: 0;
        pointer-events: none;
      }
  
      /* Age Restriction Message */
      #age-restriction-message {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 60;
        background-color: rgba(255, 255, 255, 0.95); /* やや白透過で上に重ねる */
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 1.5rem;
        box-sizing: border-box;
        text-align: center;
        flex-direction: column;
        display: none;
      }
  
      #age-restriction-message.show {
        display: flex;
        animation: fadeIn 0.5s ease forwards;
      }
  
      /* Hidden Utility */
      .hidden {
        display: none !important;
      }
  
      /* Specific Styles */
      .hero-section {
        position: relative;
        height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        overflow: hidden;
      }
  
      /* New Photo Grid Styles */
      .photo-grid-container {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        overflow: hidden;
      }
  
      .photo-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: repeat(3, 1fr);
        width: 100%;
        height: 100%;
        transition: transform 0.3s ease-out;
      }
  
      @media (min-width: 768px) {
        .photo-grid {
          grid-template-columns: repeat(4, 1fr);
          grid-template-rows: repeat(3, 1fr);
        }
      }
  
      @media (min-width: 1024px) {
        .photo-grid {
          grid-template-columns: repeat(5, 1fr);
          grid-template-rows: repeat(3, 1fr);
        }
      }
  
      .photo-item {
        position: relative;
        overflow: hidden;
      }
  
      .photo-item img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.5s ease;
      }
  
      .photo-item:hover img {
        transform: scale(1.05);
      }
  
      .photo-overlay {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(to bottom, rgba(0,0,0,0.3), rgba(0,0,0,0.6));
      }
  
      .hero-content-overlay {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        /*background: rgba(0, 0, 0, 0.5);*/
        z-index: 5;
      }
  
      .hero-bg {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-image: url('https://source.unsplash.com/random/1920x1080/?night,city');
        background-size: cover;
        background-position: center;
        transform: translateY(0);
        transition: transform 0.1s ease-out;
      }
  
      .hero-overlay {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(to bottom, rgba(0,0,0,0.7), rgba(0,0,0,0.4));
      }
  
      .card-image {
        height: 18rem;
        background-size: cover;
        background-position: center;
        position: relative;
        overflow: hidden;
      }
  
      .card-image-inner {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-size: cover;
        background-position: center;
        transition: transform 0.5s ease;
      }
  
      .card:hover .card-image-inner {
        transform: scale(1.05);
      }
  
      .tag-container {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-bottom: 1rem;
      }
  
      .cta-section {
        position: relative;
        padding: 5rem 1rem;
        overflow: hidden;
      }
  
      .cta-bg {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-image: url('https://source.unsplash.com/random/1920x1080/?night,social');
        background-size: cover;
        background-position: center;
      }
  
      .cta-overlay {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.7);
      }
  
      /* Loading Animation */
      .loading-spinner {
        display: inline-block;
        width: 1.25rem;
        height: 1.25rem;
        margin-right: 0.75rem;
        border: 2px solid rgba(255, 255, 255, 0.3);
        border-radius: 50%;
        border-top-color: white;
        animation: spin 1s linear infinite;
      }
  
      /* LINE Icon */
      .line-icon {
        display: inline-block;
        vertical-align: middle;
        margin-right: 0.5rem;
      }