* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-app: #1e1e1e;
    --bg-pane: #252526;
    --bg-header: #333333;
    --text-primary: #d4d4d4;
    --text-secondary: #808080;
    --border: #3c3c3c;
    --accent: #0e639c;
    --accent-hover: #1177bb;
    --success: #4ec9b0;
    --error: #f14c4c;
}

body {
    font-family: 'Consolas', 'Monaco', monospace;
    background: var(--bg-app);
    color: var(--text-primary);
    min-height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
}

.header h1 {
    font-size: 1rem;
    font-weight: 500;
}

.header-controls {
    display: flex;
    gap: 0.5rem;
}

.btn-primary, .btn-secondary {
    padding: 0.4rem 0.8rem;
    border: none;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg-pane);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-small {
    padding: 0.25rem 0.5rem;
    font-size: 0.7rem;
}

.main-content {
    flex: 1;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* モードタブ */
.mode-tabs {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-pane);
    padding: 0.25rem;
    border-radius: 6px;
    width: fit-content;
}

.mode-tab {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
}

.mode-tab:hover {
    color: var(--text-primary);
}

.mode-tab.active {
    background: var(--accent);
    color: white;
}

.mode-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.mode-content.hidden {
    display: none;
}

/* コンテンツグリッド */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    flex: 1;
}

section {
    background: var(--bg-pane);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-radius: 6px 6px 0 0;
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.url-safe-toggle {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2rem 0.4rem;
    background: var(--bg-pane);
    border: 1px solid var(--border);
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.65rem;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.url-safe-toggle:hover {
    border-color: var(--accent);
}

.url-safe-toggle input {
    display: none;
}

.url-safe-toggle:has(input:checked) {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

/* テキストエリア */
textarea {
    flex: 1;
    min-height: 200px;
    padding: 0.75rem;
    background: var(--bg-pane);
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    line-height: 1.5;
    resize: none;
    outline: none;
}

textarea::placeholder {
    color: var(--text-secondary);
}

textarea[readonly] {
    background: var(--bg-app);
}

/* ドロップゾーン */
.image-drop-zone, .file-drop-zone {
    flex: 1;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    border: 2px dashed var(--border);
    border-radius: 0 0 6px 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.image-drop-zone:hover, .file-drop-zone:hover,
.image-drop-zone.dragover, .file-drop-zone.dragover {
    border-color: var(--accent);
    background: rgba(14, 99, 156, 0.1);
}

.drop-content {
    text-align: center;
    color: var(--text-secondary);
}

.drop-content svg {
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

.drop-content p {
    font-size: 0.85rem;
}

/* 画像プレビュー */
.image-preview {
    max-width: 100%;
    max-height: 200px;
    border-radius: 4px;
}

.image-preview.hidden {
    display: none;
}

/* 出力情報 */
.output-info {
    display: flex;
    gap: 1rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.7rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
}

/* ファイル情報 */
.file-info {
    display: flex;
    gap: 1rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    color: var(--success);
    background: var(--bg-header);
    border-radius: 4px;
    margin-top: 0.5rem;
}

.file-info.hidden {
    display: none;
}

/* 統計バー */
.stats-bar {
    display: flex;
    gap: 2rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-pane);
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* フッター */
.footer {
    padding: 0.5rem 1rem;
    background: var(--bg-header);
    border-top: 1px solid var(--border);
    font-size: 0.7rem;
    color: var(--text-secondary);
}

/* トースト */
.toast {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    background: var(--success);
    color: var(--bg-app);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.2s;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* デコード画像プレビュー */
.decoded-image-preview {
    margin-top: 0.5rem;
    background: var(--bg-app);
    border-radius: 4px;
    overflow: hidden;
}

.decoded-image-preview.hidden {
    display: none;
}

.decoded-image-preview .preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.4rem 0.6rem;
    background: var(--bg-header);
    font-size: 0.7rem;
    color: var(--success);
}

.decoded-image-preview img {
    display: block;
    max-width: 100%;
    max-height: 200px;
    margin: 0.5rem auto;
    border-radius: 4px;
}

/* レスポンシブ */
@media (max-width: 768px) {
    .content-grid {
        grid-template-columns: 1fr;
    }

    .mode-tabs {
        width: 100%;
        justify-content: center;
    }

    .stats-bar {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
}