@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

        /* --- CSS: Design Definitions --- */
        :root {
            --bg-color: #f8fafc;
            --card-bg: #ffffff;
            --primary-blue: #2563eb;
            --text-main: #1f2937;
            --text-muted: #9ca3af;
            --border-color: #f1f5f9;
        }

        body {
            font-family: 'Noto+Sans+JP', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-main);
            margin: 0;
        }

        /* Layout */
        .page-header {
            background-color: white;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 50;
        }

        .container {
            max-width: 80rem;
            margin: 0 auto;
            padding: 1rem 1.5rem;
        }

        .header-flex {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .main-content {
            padding: 2rem 0;
        }

        /* Stats Section */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(1, minmax(0, 1fr));
            gap: 1.5rem;
            margin-bottom: 2rem;
        }

        @media (min-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(3, minmax(0, 1fr));
            }
        }

        .stat-card {
            background: white;
            padding: 1.5rem;
            border-radius: 1rem;
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
        }

        .stat-icon {
            padding: 0.75rem;
            border-radius: 9999px;
            margin-right: 1rem;
        }

        /* Filter Section */
        .controls-flex {
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            margin-bottom: 2rem;
            gap: 1rem;
        }

        @media (min-width: 768px) {
            .controls-flex {
                flex-direction: row;
                align-items: center;
            }
        }

        .search-box {
            position: relative;
            width: 100%;
        }

        @media (min-width: 768px) {
            .search-box {
                width: 16rem;
            }
        }

        .input-field {
            width: 100%;
            background: white;
            border: 1px solid #d1d5db;
            border-radius: 0.5rem;
            padding: 0.625rem 0.625rem 0.625rem 2.5rem;
            font-size: 0.875rem;
            outline: none;
        }

        .input-field:focus {
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 1px var(--primary-blue);
        }

        /* Trip Cards Grid */
        .trips-grid {
            display: grid;
            grid-template-columns: repeat(1, minmax(0, 1fr));
            gap: 2rem;
        }

        @media (min-width: 640px) {
            .trips-grid {
                grid-template-columns: repeat(2, minmax(0, 1fr));
            }
        }

        @media (min-width: 1024px) {
            .trips-grid {
                grid-template-columns: repeat(3, minmax(0, 1fr));
            }
        }

        /* Individual Card */
        .trip-card {
            background: white;
            border-radius: 1rem;
            overflow: hidden;
            border: 1px solid var(--border-color);
            text-decoration: none;
            color: inherit;
            display: block;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .trip-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }

        .card-image-wrapper {
            position: relative;
            height: 12rem;
            overflow: hidden;
        }

        .card-image {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .trip-card:hover .card-image {
            transform: scale(1.1);
        }

        .category-badge {
            position: absolute;
            top: 0.75rem;
            right: 0.75rem;
            background: rgba(255, 255, 255, 0.9);
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            font-size: 0.75rem;
            font-weight: 600;
        }

        .favorite-btn {
            position: absolute;
            top: 0.75rem;
            left: 0.75rem;
            width: 2rem;
            height: 2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 9999px;
            transition: all 0.2s;
        }

        .card-body {
            padding: 1.25rem;
        }

        .card-date {
            display: flex;
            align-items: center;
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-bottom: 0.25rem;
        }

        .card-title {
            font-size: 1.125rem;
            font-weight: 700;
            display: flex;
            align-items: center;
        }

        .chevron-icon {
            margin-left: auto;
            font-size: 0.75rem;
            opacity: 0;
            transform: translateX(-10px);
            transition: all 0.3s;
            color: var(--primary-blue);
        }

        .trip-card:hover .chevron-icon {
            opacity: 1;
            transform: translateX(0);
        }

        footer {
            border-top: 1px solid #e5e7eb;
            padding: 3rem 0;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.875rem;
        }