:root {
    --color-bg: #FFF7FB;
    --color-surface: #ffffff;
    --color-border: #F6DDEA;
    --color-text: #3A2E38;
    /* WCAG AA(4.5:1)を満たすよう#9B8894から調整 */
    --color-text-sub: #7C6C76;

    /* WCAG AA(4.5:1)を満たすよう#FF3E9Dから調整（文字色・ボタン背景として使用するため） */
    --color-primary: #CF327F;
    --color-primary-hover: #AF2A6B;
    --color-primary-soft: #FFE3F1;

    --color-brand-1: #FF3E9D;
    --color-brand-2: #8B5CF6;

    --radius: 16px;
    --radius-pill: 999px;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-bg: #17131C;
        --color-surface: #241E2C;
        --color-border: #3A2E45;
        --color-text: #F3E9F2;
        --color-text-sub: #B8A8C2;

        --color-primary: #FF5CAE;
        --color-primary-hover: #FF7DC0;
        --color-primary-soft: #3D2036;
    }
}

:root[data-theme="dark"] {
    --color-bg: #17131C;
    --color-surface: #241E2C;
    --color-border: #3A2E45;
    --color-text: #F3E9F2;
    --color-text-sub: #B8A8C2;

    --color-primary: #FF5CAE;
    --color-primary-hover: #FF7DC0;
    --color-primary-soft: #3D2036;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "M PLUS Rounded 1c", "Hiragino Maru Gothic ProN", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

.site-header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(6px);
    border-bottom: 2px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.logo {
    font-weight: 700;
    font-size: 1.3rem;
    text-decoration: none;
    background: linear-gradient(90deg, var(--color-brand-1), var(--color-brand-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.site-nav {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.site-nav a {
    color: var(--color-text-sub);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 8px 16px;
    border-radius: var(--radius-pill);
    transition: background 0.15s ease, color 0.15s ease;
}

.site-nav a:hover {
    color: var(--color-primary);
    background: var(--color-primary-soft);
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 6px 16px;
    margin: 0;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-pill);
    background: var(--color-surface);
    color: var(--color-text-sub);
    font-size: 0.85rem;
    font-weight: 700;
    font-family: inherit;
    line-height: 1;
    cursor: pointer;
    box-shadow: none;
}

.theme-toggle:hover {
    border-color: var(--color-primary);
    transform: none;
    box-shadow: none;
}

.main-content {
    padding: 48px 20px;
    min-height: 60vh;
}

/* パンくずリスト */
.breadcrumb {
    margin-bottom: 20px;
    font-size: 0.85rem;
    color: var(--color-text-sub);
}

.breadcrumb ol {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

.breadcrumb li:not(:last-child)::after {
    content: "›";
    margin: 0 8px;
    color: var(--color-text-sub);
}

.breadcrumb a {
    color: var(--color-text-sub);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

.breadcrumb li[aria-current="page"] {
    color: var(--color-text);
    font-weight: 700;
    /* 長いページ名は1行に収めて省略 */
    max-width: 60vw;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.site-footer {
    border-top: 2px solid var(--color-border);
    padding: 28px 0;
    color: var(--color-text-sub);
    font-size: 0.85rem;
    text-align: center;
}

h1 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--color-primary);
}

.lead { color: var(--color-text-sub); margin-bottom: 32px; }

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.category-heading {
    color: var(--color-primary);
    font-size: 1.2rem;
    margin: 0 0 16px;
}

.tool-card {
    display: block;
    position: relative;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    padding: 22px;
    text-decoration: none;
    color: var(--color-text);
    transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.tool-search-box { margin-bottom: 32px; }
#tool-search.tool-search-box { background: var(--color-surface); }

.favorite-star {
    position: absolute;
    top: 10px;
    right: 10px;
    width: auto;
    background: transparent;
    border: none;
    padding: 4px;
    margin: 0;
    font-size: 1.3rem;
    line-height: 1;
    cursor: pointer;
    color: var(--color-text-sub);
    box-shadow: none;
    z-index: 2;
}

.favorite-star:hover { transform: none; color: var(--color-primary); }
.favorite-star.active { color: var(--color-primary); }

.share-row { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.share-link {
    display: inline-block;
    margin: 0;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-pill);
    background: #14171A;
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
    box-shadow: none;
}

.share-link:hover { background: #000; transform: none; }

.share-link.share-line { background: #06C755; }
.share-link.share-line:hover { background: #05a648; }

.share-link.share-copy { background: var(--color-primary); }
.share-link.share-copy:hover { background: var(--color-primary-hover); }

.tool-card:hover {
    box-shadow: 0 10px 24px -8px var(--color-primary);
    transform: translateY(-4px);
    border-color: var(--color-primary-soft);
}

.tool-card h2 {
    font-size: 1.1rem;
    margin: 0 0 6px;
    padding-right: 30px;
    color: var(--color-primary);
    font-weight: 700;
}

.tool-card p { font-size: 0.85rem; color: var(--color-text-sub); margin: 0; }

.panel {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: 24px;
    padding: 28px;
    margin-bottom: 24px;
    box-shadow: 0 12px 32px -16px rgba(58, 46, 56, 0.15);
}

label {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 6px;
    margin-top: 18px;
}

label:first-child { margin-top: 0; }

.panel h2 {
    font-size: 1.1rem;
    color: var(--color-primary);
    margin: 28px 0 10px;
}

.panel h2:first-child { margin-top: 0; }

.panel ul {
    padding-left: 1.4em;
    margin: 0 0 16px;
}

.panel li { margin-bottom: 6px; }

.panel a:not(.download-link) { color: var(--color-primary); }
.panel .file-list a { color: #fff; }

.site-footer a { color: var(--color-text-sub); }
.site-footer a:hover { color: var(--color-primary); }

input[type="text"],
input[type="number"],
input[type="email"],
input[type="file"],
input[type="date"],
input[type="search"],
select,
textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-pill);
    font-size: 0.95rem;
    font-family: inherit;
    background: var(--color-bg);
    transition: border-color 0.15s ease;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="email"]:focus,
input[type="date"]:focus,
input[type="search"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

input[type="file"] { border-radius: var(--radius); }

textarea {
    border-radius: var(--radius);
    resize: vertical;
}

textarea[readonly] { background: var(--color-surface); }

.color-preview-card {
    width: 100%;
    height: 140px;
    border-radius: var(--radius);
    border: 2px solid var(--color-border);
    box-shadow: 0 12px 32px -16px rgba(58, 46, 56, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    transition: background-color 0.15s ease;
}

.color-preview-card span {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    padding: 8px 22px;
    border-radius: var(--radius-pill);
    background: rgba(255, 255, 255, 0.35);
    backdrop-filter: blur(4px);
}

.color-input-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.color-input-row input[type="text"] { flex: 1; }

input[type="color"] {
    width: 56px;
    height: 56px;
    padding: 0;
    flex-shrink: 0;
    border: 3px solid var(--color-surface);
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--color-border);
    cursor: pointer;
    overflow: hidden;
}

input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch { border: none; border-radius: 50%; }
input[type="color"]::-moz-color-swatch { border: none; border-radius: 50%; }

input[type="range"] {
    width: 100%;
    accent-color: var(--color-primary);
}

.checkbox-row { display: flex; align-items: center; gap: 8px; margin-top: 10px; }
.checkbox-row input { width: auto; accent-color: var(--color-primary); }
.checkbox-row label { margin: 0; font-weight: 400; }

button {
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
    color: #fff;
    border: none;
    padding: 14px 32px;
    border-radius: var(--radius-pill);
    font-size: 0.95rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    margin-top: 24px;
    box-shadow: 0 8px 20px -6px var(--color-primary);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px -6px var(--color-primary-hover);
}

.result-box {
    margin-top: 28px;
    padding: 24px;
    background: var(--color-primary-soft);
    border: 2px dashed var(--color-primary);
    border-radius: var(--radius);
    text-align: center;
}

.result-box img, .result-box canvas { max-width: 100%; border-radius: 12px; }

.result-box.align-left { text-align: left; }
.result-box.align-left p { margin: 8px 0; }
.hash-result span { word-break: break-all; font-size: 0.85rem; }

.note {
    font-size: 0.8rem;
    color: var(--color-text-sub);
    margin-top: 8px;
}

.file-list {
    list-style: none;
    padding: 0;
    margin: 12px 0 0;
}

.file-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    background: var(--color-bg);
    border-radius: var(--radius-pill);
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.file-info {
    display: flex;
    align-items: center;
    flex: 1;
    min-width: 0;
    gap: 12px;
}

.file-info span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-thumb {
    width: 44px;
    height: 44px;
    object-fit: cover;
    border-radius: 8px;
    flex-shrink: 0;
    border: 1px solid var(--color-border);
    background: #fff;
}

.file-list button {
    margin: 0;
    padding: 6px 14px;
    font-size: 0.75rem;
    background: #FF5C7A;
    box-shadow: none;
    flex-shrink: 0;
}

.file-list button:hover { background: #E6446A; transform: none; }

.file-list a {
    background: var(--color-primary);
    color: #fff;
    text-decoration: none;
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

.file-list a:hover { background: var(--color-primary-hover); }

.download-link {
    display: inline-block;
    margin-top: 14px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
    color: #fff;
    font-weight: 700;
    padding: 12px 28px;
    border-radius: var(--radius-pill);
    text-decoration: none;
    box-shadow: 0 8px 20px -6px var(--color-primary);
}

.pdf-page-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 20px;
}

.pdf-page-thumb {
    width: 130px;
    border: 2px solid var(--color-border);
    border-radius: 12px;
    padding: 10px;
    text-align: center;
    background: var(--color-bg);
    cursor: pointer;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.pdf-page-thumb:hover { border-color: var(--color-primary-soft); }

.pdf-page-thumb.selected {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.pdf-page-thumb .thumb-canvas-wrap {
    overflow: hidden;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(58, 46, 56, 0.15);
    background: #fff;
}

.pdf-page-thumb canvas {
    max-width: 100%;
    display: block;
    transition: transform 0.2s ease;
}

.pdf-page-thumb .page-num {
    font-size: 0.75rem;
    color: var(--color-text-sub);
    margin-top: 8px;
}

.pdf-page-thumb .page-name {
    font-size: 0.72rem;
    color: var(--color-text-sub);
    margin-top: 4px;
    word-break: break-all;
}

.mini-btn {
    display: inline-block;
    margin: 6px 2px 0;
    padding: 5px 10px;
    font-size: 0.7rem;
    font-weight: 700;
    border: none;
    border-radius: var(--radius-pill);
    background: var(--color-primary);
    color: #fff;
    cursor: pointer;
    box-shadow: none;
}

.mini-btn:hover { background: var(--color-primary-hover); transform: none; }

.mini-btn.secondary {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.toolbar-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-top: 16px;
}

.csv-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.csv-table th,
.csv-table td {
    border: 1px solid var(--color-border);
    padding: 8px 12px;
    text-align: left;
    white-space: nowrap;
}

.csv-table th {
    background: var(--color-primary-soft);
    cursor: pointer;
    user-select: none;
}

.csv-table th:hover { background: var(--color-border); }

.csv-table tbody tr:nth-child(even) { background: var(--color-bg); }

.csv-table .col-remove {
    margin-left: 8px;
    background: transparent;
    border: none;
    color: var(--color-text-sub);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 0 4px;
    box-shadow: none;
}

.csv-table .col-remove:hover { color: #E6446A; transform: none; }

/* ==========================================================
   レスポンシブ対応（タブレット・スマートフォン）
   ========================================================== */
@media (max-width: 768px) {
    .container { padding: 0 16px; }

    .main-content { padding: 32px 16px; }

    .header-inner { padding: 12px 16px; }

    .site-nav a { padding: 6px 12px; font-size: 0.85rem; }

    h1 { font-size: 1.5rem; }

    .tool-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; }

    .tool-card { padding: 16px; }

    .panel { padding: 20px; }

    .pdf-page-thumb { width: 100px; padding: 8px; }

    /* iOSでの入力時自動ズームを防ぐため16px以上を確保 */
    input[type="text"],
    input[type="number"],
    input[type="email"],
    input[type="date"],
    input[type="search"],
    select,
    textarea {
        font-size: 16px;
    }

    /* タップ領域をWCAG推奨の44px相当に拡大 */
    .favorite-star {
        width: 40px;
        height: 40px;
        font-size: 1.4rem;
    }

    .mini-btn { padding: 8px 14px; font-size: 0.78rem; }
}

@media (max-width: 480px) {
    .header-inner { flex-direction: column; align-items: flex-start; gap: 8px; }

    .header-actions { width: 100%; justify-content: space-between; }

    .site-nav { width: auto; }

    .site-nav a { padding: 6px 10px; }

    h1 { font-size: 1.3rem; }

    .lead { margin-bottom: 24px; }

    .tool-grid { grid-template-columns: 1fr; }

    .panel { padding: 16px; border-radius: 16px; }

    button { width: 100%; padding: 14px 20px; }

    .file-list li { flex-wrap: wrap; gap: 8px; }

    .color-input-row { flex-wrap: wrap; }

    .pdf-page-thumb { width: calc(50% - 6px); }

    .toolbar-row { gap: 6px; }

    .share-row { flex-direction: column; align-items: stretch; }

    .share-link { text-align: center; }
}