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

body {
    font-family: 'Noto Sans JP', sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f0f2f5; /* 落ち着いたライトグレー */
    color: #34495e; /* ダークなテキスト色 */
}

.container {
    max-width: 900px;
    margin: 20px auto;
    background-color: #ffffff;
    padding: 30px;
    border-radius: 10px; /* 角を少し丸く */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08); /* 影を強調 */
}

h1 {
    text-align: center;
    color: #2c3e50; /* より深い青 */
    margin-bottom: 15px;
    font-weight: 700; /* 太字 */
}

p {
    text-align: center;
    margin-bottom: 25px;
    color: #7f8c8d; /* 落ち着いたグレー */
    line-height: 1.6;
}

.search-filter-area {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 25px;
    align-items: center;
    justify-content: center; /* 中央寄せ */
}

#search-input {
    flex-grow: 1;
    padding: 12px 15px;
    border: 1px solid #dcdfe6;
    border-radius: 6px;
    font-size: 16px;
    min-width: 220px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

#search-input:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
    outline: none;
}

.filter-select {
    padding: 12px 15px;
    border: 1px solid #dcdfe6;
    border-radius: 6px;
    font-size: 16px;
    background-color: #fff;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.filter-select:hover {
    border-color: #aeb6bf;
}

#tag-filter-container {
    width: 100%;
    margin-top: 15px;
}

#tag-filter-container details {
    border: 1px solid #e0e6ed;
    border-radius: 8px;
    padding: 15px;
    background-color: #fdfdfe;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.03);
}

#tag-filter-container summary {
    font-weight: 700;
    cursor: pointer;
    padding: 5px 0;
    outline: none;
    color: #34495e;
    list-style: none; /* デフォルトの矢印を非表示 */
}

#tag-filter-container summary::-webkit-details-marker {
    display: none; /* Chrome/Safariの矢印を非表示 */
}

#tag-filter-container summary::before {
    content: '▶'; /* カスタム矢印 */
    display: inline-block;
    margin-right: 10px;
    transition: transform 0.2s ease;
}

#tag-filter-container details[open] summary::before {
    transform: rotate(90deg);
}

.tag-buttons-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding-top: 15px;
    border-top: 1px solid #eee; /* 区切り線 */
    margin-top: 10px;
}

.tag-button {
    background-color: #ecf0f1;
    color: #555;
    border: none;
    padding: 10px 15px;
    border-radius: 25px; /* より丸く */
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.tag-button:hover {
    background-color: #dce4e6;
    transform: translateY(-2px);
}

.tag-button.active {
    background-color: #3498db; /* メインカラー */
    color: #fff;
    box-shadow: 0 4px 8px rgba(52, 152, 219, 0.3);
}

#app-list-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 35px;
}

.app-card {
    background-color: #ffffff;
    border: 1px solid #e0e6ed;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.app-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.app-card h2 {
    font-size: 1.5em;
    color: #2c3e50;
    margin-top: 0;
    margin-bottom: 12px;
    line-height: 1.4;
}

.app-card .tags {
    margin-bottom: 18px;
    min-height: 45px;
}

.app-card .tag {
    background-color: #e9f2f7;
    color: #5fa2dd;
    padding: 6px 12px;
    border-radius: 18px;
    font-size: 0.85em;
    margin-right: 6px;
    margin-bottom: 6px;
    display: inline-block;
    border: 1px solid #d0e0eb;
}

.app-card a {
    display: inline-block;
    background-color: #3498db; /* メインカラー */
    color: white;
    padding: 12px 20px;
    border-radius: 6px;
    text-decoration: none;
    text-align: center;
    margin-top: auto;
    transition: background-color 0.3s ease, transform 0.2s ease;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.app-card a:hover {
    background-color: #2980b9;
    transform: translateY(-1px);
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }

    .container {
        padding: 20px;
    }

    .search-filter-area {
        flex-direction: column;
        align-items: stretch;
    }

    #search-input, .filter-select {
        width: 100%;
    }

    #app-list-container {
        grid-template-columns: 1fr;
    }
}