:root {
    --mandal-grid-size: 9;
    --mandal-border-color: #ddd;
    --mandal-border-bold-color: #999;
    --mandal-highlight-color: #ffc;
    --mandal-completed-blur: blur(1px);
    --mandal-sidebar-bg: #ffffff;
    --mandal-active-color: #e0f7fa;
    --mandal-danger-color: #ffebee;
}

/* --- 최상위 컨테이너 --- */
.mandal-art-container {
    display: flex;
    height: 100%;
    width: 100%;
    background-color: #f4f7f6; /* 배경색 추가 */
}

/* --- 사이드바 --- */
.mandal-art-sidebar {
    width: 280px;
    background-color: var(--mandal-sidebar-bg);
    border-right: 1px solid var(--mandal-border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex-shrink: 0; /* 사이드바 너비 고정 */
}

.mandal-art-sidebar-header {
    border-bottom: 1px solid var(--mandal-border-color);
    padding-bottom: 15px;
    margin-bottom: 15px;
}

.mandal-art-sidebar h2 {
    font-size: 1.5em;
    color: #00796b;
    margin: 0;
}

.mandal-art-sidebar #mandal-list {
    list-style: none;
    padding: 0;
    margin: 0;
    flex-grow: 1;
    overflow-y: auto;
}

.mandal-art-sidebar #mandal-list li {
    padding: 15px;
    cursor: pointer;
    border-radius: 8px;
    margin-bottom: 10px;
    transition: background-color 0.2s ease-in-out;
    position: relative;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mandal-art-sidebar #mandal-list li:hover {
    background-color: #f0f0f0;
}

.mandal-art-sidebar #mandal-list li.active {
    background-color: var(--mandal-active-color);
    font-weight: bold;
}

.mandal-art-sidebar #mandal-list li.mandal-dragging {
    opacity: 0.5;
}

.mandal-art-add-btn { /* HTML의 ID/클래스 이름과 일치시킴 */
    margin-top: 20px;
    padding: 10px;
    font-size: 1.8em;
    font-weight: bold;
    color: #00796b;
    background-color: #e0f2f1;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    align-self: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.mandal-art-add-btn:hover {
    background-color: #b2dfdb;
    transform: rotate(90deg);
}

/* --- 메인 콘텐츠 및 그리드 --- */
.mandal-art-main-content { /* HTML의 클래스 이름과 일치시킴 */
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow: hidden;
}

.mandal-art-grid-container { /* HTML의 클래스 이름과 일치시킴 */
    display: grid;
    grid-template-columns: repeat(var(--mandal-grid-size), 1fr);
    grid-template-rows: repeat(var(--mandal-grid-size), 1fr);
    width: 85vmin;
    height: 85vmin;
    border: 3px solid var(--mandal-border-bold-color);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* --- 셀 스타일 (가장 중요) --- */
/* 모든 .cell 관련 스타일은 .mandal-art-grid-container 하위로 한정 */
.mandal-art-grid-container .cell {
    border: 1px solid var(--mandal-border-color);
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s;
    background-color: #fff;
}

.mandal-art-grid-container .cell.border-right-bold { border-right: 3px solid var(--mandal-border-bold-color); }
.mandal-art-grid-container .cell.border-bottom-bold { border-bottom: 3px solid var(--mandal-border-bold-color); }

.mandal-art-grid-container .cell.central-goal { font-weight: bold; }

.mandal-art-grid-container .cell.sub-goal { background-color: #f5f5f5; font-weight: bold; }
.mandal-art-grid-container .cell.sub-goal textarea { color: #555; }

.mandal-art-grid-container .cell textarea {
    width: 100%;
    /* height: 100%; */
    border: none;
    outline: none;
    resize: none;
    background-color: transparent;
    padding: 8px;
    font-size: 1em;
    text-align: center;
    font-family: inherit;
    color: inherit; /* 부모(.cell)의 글자색을 상속받도록 명시 */
    display: grid;
    place-content: center;
}

.mandal-art-grid-container .cell.completed > textarea {
    filter: var(--mandal-completed-blur);
    opacity: 0.6;
}

.mandal-art-grid-container .checkmark {
    position: absolute;
    top: 5px;
    right: 5px;
    font-size: 1.2em;
    color: #4CAF50;
    display: none;
    user-select: none; /* 체크마크 선택 방지 */
}

.mandal-art-grid-container .cell.completed .checkmark {
    display: block;
}

.mandal-art-grid-container .cell.highlighted {
    box-shadow: 0 0 0 3px var(--mandal-highlight-color) inset;
    border-color: var(--mandal-highlight-color);
}

/* --- 컨텍스트 메뉴 --- */
.mandal-art-context-menu { /* HTML의 클래스 이름과 일치시킴 */
    position: fixed; /* absolute 대신 fixed 사용하면 스크롤에 영향받지 않음 */
    display: none;
    background-color: var(--mandal-sidebar-bg);
    border: 1px solid var(--mandal-border-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 5px 0;
    z-index: 1000;
    font-size: 14px;
}

.mandal-art-context-menu ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mandal-art-context-menu li {
    padding: 10px 20px;
    cursor: pointer;
    white-space: nowrap;
}

.mandal-art-context-menu li label {
    cursor: pointer;
}

.mandal-art-context-menu li:hover {
    background-color: #f0f0f0;
}

.mandal-art-context-menu li[data-action="delete-mandal"]:hover,
.mandal-art-context-menu li[data-action="delete-content"]:hover {
    background-color: var(--mandal-danger-color);
}

/* color-picker는 ID가 구체적이므로 그대로 사용 가능 */
#mandal-color-picker {
    visibility: hidden;
    width: 0;
    height: 0;
    position: absolute;
}