:root {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --card-bg: #2a2a2a;
    --card-border: #444;
    --accent-color: #00bcd4; /* シアン系のアクセントカラー */
    --hover-color: #0097a7;
    --tag-default-bg: #4caf50; /* デフォルトのタグ色 (特定のタグ色が設定されていない場合) */
    --level-bg: #ffc107; /* 黄色系のレベル色 */
}

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header {
    background-color: var(--card-bg);
    padding: 1rem;
    text-align: center;
    border-bottom: 2px solid var(--accent-color);
}

h1 {
    margin: 0;
    color: var(--accent-color);
    font-size: 1.8rem;
}

main {
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--card-border);
}

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

.filter-group, .search-group {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.filter-group label, .search-group label {
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-size: 0.9rem;
}

#tag-filter, #keyword-search {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--card-border);
    border-radius: 4px;
    background-color: #333;
    color: var(--text-color);
    font-size: 1rem;
    box-sizing: border-box;
}

#tag-filter {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url('data:image/svg+xml;utf8,<svg fill="%23e0e0e0" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/><path d="M0 0h24v24H0z" fill="none"/></svg>');
    background-repeat: no-repeat;
    background-position: right 8px top 50%;
    background-size: 24px auto;
}

.skill-list {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.skill-card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.6);
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 0.8rem;
}

.skill-header h2 {
    margin: 0;
    font-size: 1.4rem;
    color: var(--accent-color);
}

.skill-meta {
    display: flex;
    gap: 0.5rem;
    font-size: 0.85rem;
    white-space: nowrap;
}

.skill-meta .tag {
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-weight: bold;
    color: white;
    background-color: var(--tag-default-bg);
}

/* 武器種別ごとの色分け */
.skill-meta .tag.素手\/篭手 { /* スラッシュを含むため注意 */
    background-color: #ff9800; /* オレンジ系 */
}

.skill-meta .tag.剣と盾 { /* スラッシュを含むため注意 */
    background-color: #2196f3; /* 青系 */
}

.skill-meta .tag.戦棒 {
    background-color: #9c27b0; /* 紫系 */
}

.skill-meta .tag.大剣 {
    background-color: #f44336; /* 赤系 */
}

.skill-meta .tag.杖 {
    background-color: #4caf50; /* 緑系 */
}

.skill-meta .tag.短剣 {
    background-color: #607d8b; /* 青灰系 */
}

.skill-meta .tag.弓 {
    background-color: #ffeb3b; /* 黄色系 */
    color: #333; /* 文字色を濃くして見やすく */
}

.skill-details p {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.skill-details strong {
    color: var(--accent-color);
}

.skill-active, .skill-passive {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--card-border);
}

.skill-active h3, .skill-passive h3 {
    margin-top: 0;
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
    color: var(--text-color);
}

.skill-active ul, .skill-passive ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.skill-active li, .skill-passive li {
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
}

.highlight {
    background-color: rgba(255, 255, 0, 0.3);
    color: black;
    border-radius: 3px;
    padding: 0 2px;
}

footer {
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
    border-top: 1px solid var(--card-border);
    color: #888;
    font-size: 0.8rem;
}

#page-top-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
    opacity: 0;
    visibility: hidden;
    z-index: 1001;
}

#page-top-button.show {
    opacity: 1;
    visibility: visible;
}

@media (max-width: 767px) {
    h1 {
        font-size: 1.5rem;
    }

    .skill-card {
        padding: 1rem;
    }

    .skill-header h2 {
        font-size: 1.2rem;
    }

    .skill-details p, .skill-active li, .skill-passive li {
        font-size: 0.85rem;
    }

    #page-top-button {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
        bottom: 15px;
        right: 15px;
    }
}