* {
    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;
    --warning: #cca700;
    --match-bg: rgba(255, 213, 0, 0.3);
    --match-border: #ffd500;
    --group-1: rgba(99, 102, 241, 0.3);
    --group-2: rgba(168, 85, 247, 0.3);
    --group-3: rgba(236, 72, 153, 0.3);
    --group-4: rgba(34, 197, 94, 0.3);
}

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: background 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);
}

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

/* パターン入力セクション */
.pattern-section {
    background: var(--bg-pane);
    border-radius: 6px;
    padding: 1rem;
}

.pattern-input-wrapper {
    display: flex;
    align-items: center;
    background: var(--bg-app);
    border: 2px solid var(--border);
    border-radius: 4px;
    padding: 0.5rem;
}

.pattern-input-wrapper:focus-within {
    border-color: var(--accent);
}

.pattern-delimiter {
    color: var(--text-secondary);
    font-size: 1.2rem;
    padding: 0 0.25rem;
}

#pattern {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--success);
    font-family: inherit;
    font-size: 1rem;
    outline: none;
}

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

.flags-group {
    display: flex;
    gap: 0.25rem;
    margin-left: 0.5rem;
}

.flag-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 3px;
    background: var(--bg-pane);
    cursor: pointer;
    transition: all 0.2s;
}

.flag-toggle input {
    display: none;
}

.flag-toggle span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.flag-toggle:hover {
    background: var(--border);
}

.flag-toggle:has(input:checked) {
    background: var(--accent);
}

.flag-toggle:has(input:checked) span {
    color: white;
}

.pattern-error {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: rgba(241, 76, 76, 0.2);
    border-radius: 4px;
    color: var(--error);
    font-size: 0.8rem;
}

.pattern-error.hidden {
    display: none;
}

/* プリセット */
.presets {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    flex-wrap: wrap;
}

.presets-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.preset-btn {
    padding: 0.25rem 0.5rem;
    background: var(--bg-header);
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text-primary);
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.2s;
}

.preset-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

/* 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;
}

.match-count {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    background: var(--accent);
    color: white;
    border-radius: 3px;
}

.match-count:empty {
    display: none;
}

/* テスト文字列 */
#testString {
    flex: 1;
    min-height: 150px;
    padding: 0.75rem;
    background: var(--bg-pane);
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    line-height: 1.6;
    resize: none;
    outline: none;
}

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

/* 結果表示 */
.result-view {
    flex: 1;
    min-height: 150px;
    padding: 0.75rem;
    overflow: auto;
    font-size: 0.9rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-all;
}

.result-placeholder, .match-placeholder {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.match-highlight {
    background: var(--match-bg);
    border-bottom: 2px solid var(--match-border);
    padding: 0 2px;
    border-radius: 2px;
}

/* マッチ詳細 */
.matches-section {
    max-height: 200px;
}

.match-details {
    padding: 0.75rem;
    overflow: auto;
    max-height: 160px;
}

.match-item {
    display: flex;
    gap: 1rem;
    padding: 0.5rem;
    background: var(--bg-header);
    border-radius: 4px;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
}

.match-index {
    color: var(--text-secondary);
    min-width: 2rem;
}

.match-value {
    color: var(--success);
    flex: 1;
    word-break: break-all;
}

.match-position {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.match-groups {
    margin-top: 0.25rem;
    padding-left: 1rem;
    border-left: 2px solid var(--border);
}

.match-group {
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.match-group-label {
    color: var(--text-secondary);
}

.match-group-value {
    color: var(--warning);
}

.match-named-groups {
    margin-top: 0.5rem;
    padding: 0.25rem 0.5rem;
    background: rgba(78, 201, 176, 0.1);
    border-radius: 4px;
    border-left: 2px solid var(--success);
}

.match-named-groups-title {
    font-size: 0.7rem;
    color: var(--success);
    margin-bottom: 0.25rem;
}

.match-group-label.named {
    color: var(--success);
    font-weight: 500;
}

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

.footer-info {
    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);
}

/* 置換セクション */
.replace-section {
    margin-top: 0;
}

.replace-content {
    padding: 0.75rem;
}

.replace-input-group {
    margin-bottom: 0.75rem;
}

.replace-input-group label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.replace-input-group input {
    width: 100%;
    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;
}

.replace-input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.replace-result label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.replace-result-text {
    background: var(--bg-app);
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 150px;
    overflow: auto;
    margin-bottom: 0.5rem;
    min-height: 2rem;
}

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

/* 履歴パネル */
.history-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-header);
    border: 1px solid var(--border);
    border-radius: 6px;
    width: 400px;
    max-width: 90vw;
    max-height: 60vh;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    z-index: 100;
}

.history-panel.hidden {
    display: none;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    background: var(--bg-pane);
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
}

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

.history-list {
    max-height: calc(60vh - 3rem);
    overflow-y: auto;
    padding: 0.5rem;
}

.history-item {
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.25rem;
    background: var(--bg-pane);
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
}

.history-item:hover {
    background: var(--border);
}

.history-item-pattern {
    font-size: 0.8rem;
    color: var(--success);
    word-break: break-all;
}

.history-item-flags {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.history-item-delete {
    background: none;
    border: none;
    color: var(--error);
    cursor: pointer;
    font-size: 1rem;
    padding: 0 0.25rem;
    float: right;
}

.history-empty {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
    padding: 2rem;
}

/* 分割セクション */
.split-section {
    margin-top: 0;
}

.split-content {
    padding: 0.75rem;
}

.split-count {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    background: var(--success);
    color: var(--bg-app);
    border-radius: 3px;
}

.split-count:empty {
    display: none;
}

.split-result-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    min-height: 2rem;
}

.split-item {
    background: var(--bg-app);
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    font-size: 0.85rem;
    border: 1px solid var(--border);
    color: var(--success);
    word-break: break-all;
}

.split-item:hover {
    border-color: var(--accent);
}

.split-item .split-index {
    color: var(--text-secondary);
    font-size: 0.7rem;
    margin-right: 0.25rem;
}

.split-placeholder {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

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

    .presets {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.5rem;
    }

    .flags-group {
        flex-wrap: wrap;
    }
}