* {
    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;
    --warning: #cca700;
}

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);
    flex-wrap: wrap;
    gap: 0.5rem;
}

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

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

.btn-primary, .btn-secondary, .btn-copy {
    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-copy {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
}

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

.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: 0.8rem;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
}

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

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

/* 入力・出力セクション */
.input-section, .output-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;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    cursor: pointer;
}

textarea {
    width: 100%;
    min-height: 100px;
    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: vertical;
    outline: none;
}

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

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

/* 変換ボタン */
.convert-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

/* 二重エンコード検出 */
.double-section {
    background: var(--bg-pane);
    border-radius: 6px;
}

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

.double-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;
}

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

.double-result {
    padding: 0 0.75rem 0.75rem;
}

.double-status {
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.double-status.ok {
    background: rgba(78, 201, 176, 0.15);
    color: var(--success);
}

.double-status.warning {
    background: rgba(204, 167, 0, 0.15);
    color: var(--warning);
}

.double-levels {
    background: var(--bg-app);
    border-radius: 4px;
    padding: 0.5rem;
}

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

.double-level:last-child {
    border-bottom: none;
}

.level-label {
    min-width: 60px;
    color: var(--text-secondary);
}

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

.level-copy {
    padding: 0.15rem 0.4rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text-secondary);
    font-size: 0.65rem;
    cursor: pointer;
}

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

/* URL解析セクション */
.parse-section, .builder-section {
    background: var(--bg-pane);
    border-radius: 6px;
}

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

.parse-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;
}

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

.parse-result {
    padding: 0 0.75rem 0.75rem;
}

.parse-result:empty::before {
    content: 'URLを入力して解析ボタンを押してください';
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.parse-actions {
    padding: 0.5rem 0;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.parse-item {
    display: flex;
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
}

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

.parse-label {
    min-width: 100px;
    color: var(--text-secondary);
}

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

/* クエリビルダー */
.base-url-row {
    padding: 0.75rem 0.75rem 0;
}

.base-url-row 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;
}

.base-url-row input::placeholder {
    color: var(--text-secondary);
}

.params-container {
    padding: 0.75rem;
}

.param-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 0.5rem;
}

.param-row:last-child {
    margin-bottom: 0;
}

.param-key, .param-value {
    flex: 1;
    padding: 0.4rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.8rem;
}

.param-key::placeholder, .param-value::placeholder {
    color: var(--text-secondary);
}

.param-eq {
    color: var(--text-secondary);
}

.param-remove {
    width: 24px;
    height: 24px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.param-remove:hover {
    background: #f14c4c;
    border-color: #f14c4c;
    color: white;
}

.builder-output {
    display: flex;
    gap: 0.5rem;
    padding: 0 0.75rem 0.75rem;
}

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

/* 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);
}

/* 参照表 */
.reference-section {
    background: var(--bg-pane);
    border-radius: 6px;
}

.reference-table {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 0.5rem;
    padding: 0.75rem;
}

.ref-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.4rem 0.6rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.ref-encoded {
    font-size: 0.75rem;
    color: var(--success);
    font-weight: 500;
}

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

    .mode-tabs {
        width: 100%;
        overflow-x: auto;
    }

    .convert-buttons {
        flex-direction: column;
    }

    .convert-buttons button {
        width: 100%;
    }

    .parse-content {
        flex-direction: column;
    }

    .param-row {
        flex-wrap: wrap;
    }

    .param-key, .param-value {
        flex: 1 1 40%;
    }
}