* {
    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;
}

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;
}

.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-primary.btn-large {
    padding: 0.6rem 2rem;
    font-size: 1rem;
}

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

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

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

/* 設定セクション */
.settings-section {
    background: var(--bg-pane);
    border-radius: 6px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.setting-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.setting-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    min-width: 80px;
}

.version-toggle {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-header);
    padding: 0.2rem;
    border-radius: 4px;
}

.version-btn {
    padding: 0.35rem 0.75rem;
    background: transparent;
    border: none;
    border-radius: 3px;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.version-btn:hover {
    color: var(--text-primary);
}

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

.count-control {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.count-btn {
    width: 28px;
    height: 28px;
    background: var(--bg-header);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.count-control input {
    width: 60px;
    height: 28px;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    text-align: center;
    font-family: inherit;
    font-size: 0.85rem;
}

.format-options {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.option-label {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.85rem;
    cursor: pointer;
}

.option-label input:checked + span {
    color: var(--success);
}

.generate-controls {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

/* 結果セクション */
.result-section, .history-section {
    background: var(--bg-pane);
    border-radius: 6px;
}

.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;
}

.result-count, .history-count {
    font-size: 0.75rem;
}

.results, .history {
    padding: 0.75rem;
    max-height: 300px;
    overflow-y: auto;
}

.result-placeholder, .history-placeholder {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
    font-size: 0.85rem;
}

.uuid-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border);
}

.uuid-item:last-child {
    border-bottom: none;
}

.uuid-text {
    flex: 1;
    font-size: 0.85rem;
    color: var(--success);
    word-break: break-all;
    font-family: inherit;
}

.uuid-copy {
    padding: 0.2rem 0.5rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text-secondary);
    font-size: 0.7rem;
    cursor: pointer;
    white-space: nowrap;
}

.uuid-copy:hover {
    background: var(--border);
    color: var(--text-primary);
}

/* 履歴 */
.history-section {
    flex: 1;
    min-height: 150px;
}

.history {
    max-height: 200px;
}

.history-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
}

.history-item:last-child {
    border-bottom: none;
}

.history-time {
    color: var(--text-secondary);
    font-size: 0.7rem;
    min-width: 50px;
}

.history-uuid {
    flex: 1;
    color: var(--text-primary);
    word-break: break-all;
}

/* バリデーション */
.validate-section {
    background: var(--bg-pane);
    border-radius: 6px;
}

.validate-content {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem;
}

.validate-content input {
    flex: 1;
    padding: 0.5rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
}

.validate-content input::placeholder {
    color: var(--text-secondary);
}

.validate-result {
    padding: 0 0.75rem 0.75rem;
    font-size: 0.8rem;
}

.validate-result.valid {
    color: var(--success);
}

.validate-result.invalid {
    color: #f14c4c;
}

.validate-info {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: var(--bg-app);
    border-radius: 4px;
    font-size: 0.75rem;
}

.validate-info div {
    padding: 0.2rem 0;
}

.validate-info .timestamp-info {
    color: #dcdcaa;
    font-weight: 500;
    background: rgba(220, 220, 170, 0.1);
    padding: 0.4rem 0.5rem;
    border-radius: 3px;
    margin-top: 0.25rem;
}

/* 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);
}

/* レスポンシブ */
@media (max-width: 600px) {
    .setting-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .format-options {
        flex-direction: column;
        gap: 0.5rem;
    }

    .generate-controls {
        flex-direction: column;
    }

    .generate-controls button {
        width: 100%;
    }
}