:root {
    --primary-color: #007aff;
    --text-color: #333;
    --background-color: #ffffff;
    --light-gray-color: #f8f9fa;
    --border-color: #e0e0e0;
    --error-color: #e53935;
    --success-color: #2e7d32;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    color: var(--text-color);
    background-color: var(--light-gray-color);
    line-height: 1.8;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary-color);
}

/* --- ヘッダー --- */
.tools-header {
    background-color: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 20px;
}

.tools-header .inner {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.tools-header .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 700;
}

.tools-header .brand img {
    height: 28px;
}

.tools-header nav a {
    text-decoration: none;
    margin-left: 16px;
    font-size: 0.95rem;
}

/* --- メイン --- */
main {
    flex: 1;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 32px 20px 64px;
}

.page-title {
    font-family: 'Poppins', 'Noto Sans JP', sans-serif;
    font-size: 1.8rem;
    margin: 0 0 8px;
}

.page-desc {
    margin: 0 0 24px;
    color: #666;
}

/* --- カード --- */
.card {
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}

/* --- ツール一覧 --- */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.tool-card {
    display: block;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    text-decoration: none;
    color: var(--text-color);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.tool-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.tool-card .icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.tool-card h2 {
    font-size: 1.15rem;
    margin: 0 0 6px;
}

.tool-card p {
    margin: 0;
    color: #666;
    font-size: 0.9rem;
}

/* --- フォーム要素 --- */
label {
    display: block;
    font-weight: 700;
    margin-bottom: 8px;
}

textarea {
    width: 100%;
    min-height: 200px;
    padding: 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'SFMono-Regular', Consolas, 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.6;
    resize: vertical;
    background-color: #fff;
    color: var(--text-color);
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

button {
    font-family: inherit;
    font-size: 0.95rem;
    padding: 10px 18px;
    border-radius: 8px;
    border: 1px solid var(--primary-color);
    background-color: var(--primary-color);
    color: #fff;
    cursor: pointer;
    transition: opacity 0.15s ease;
}

button:hover {
    opacity: 0.85;
}

button.secondary {
    background-color: transparent;
    color: var(--primary-color);
}

/* --- 統計表示（文字数カウント） --- */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 16px;
    margin-top: 20px;
}

.stat {
    text-align: center;
    padding: 16px 8px;
    background-color: var(--light-gray-color);
    border-radius: 8px;
}

.stat .value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: 'Poppins', sans-serif;
}

.stat .label {
    font-size: 0.85rem;
    color: #666;
}

/* --- ステータスメッセージ（JSON） --- */
.status {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    display: none;
}

.status.show {
    display: block;
}

.status.error {
    background-color: #fdecea;
    color: var(--error-color);
    border: 1px solid #f5c6cb;
}

.status.success {
    background-color: #e8f5e9;
    color: var(--success-color);
    border: 1px solid #c8e6c9;
}

/* --- QRコードプレビュー --- */
.qr-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    padding: 20px;
    background-color: var(--light-gray-color);
    border-radius: 8px;
}

.qr-preview canvas {
    max-width: 100%;
    height: auto;
    background-color: #fff;
}

.qr-placeholder {
    margin: 0;
    color: #999;
}

/* --- アプリアイコン作成 --- */
.dropzone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 24px;
    text-align: center;
    color: #666;
    background-color: var(--light-gray-color);
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.dropzone.dragover {
    border-color: var(--primary-color);
    background-color: rgba(0, 122, 255, 0.06);
}

.dropzone p {
    margin: 0 0 12px;
}

.crop-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 20px;
}

.crop-area canvas {
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    touch-action: none;
    cursor: grab;
    background-color: #fff;
}

.crop-area canvas:active {
    cursor: grabbing;
}

.crop-hint {
    margin: 10px 0 0;
    font-size: 0.85rem;
    color: #999;
}

.field {
    margin-top: 20px;
}

.field input[type="range"] {
    width: 100%;
}

/* --- フッター --- */
.tools-footer {
    text-align: center;
    padding: 24px 20px;
    background-color: #333;
    color: #ccc;
    font-size: 0.85rem;
}

.tools-footer a {
    color: #ccc;
}

@media (max-width: 480px) {
    .page-title {
        font-size: 1.5rem;
    }
}