/* Todo 리스트 기본 스타일 */
#todo {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* 입력 그룹 */
.todo-input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

#todoInput {
    flex: 1;
    padding: 12px;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    font-size: 1em;
    transition: border-color 0.3s ease;
}

#todoInput:focus {
    outline: none;
    border-color: #4C6EF5;
    box-shadow: 0 0 0 2px rgba(76, 110, 245, 0.2);
}

/* Todo 전용 버튼 스타일 */
.todo-btn {
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95em;
    transition: all 0.3s ease;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
}

#addTodo {
    background-color: #4C6EF5;
    color: white;
    min-width: 80px;
}

#addTodo:hover {
    background-color: #3B5BDB;
    transform: translateY(-2px);
}

/* CSV 컨트롤 영역 */
.todo-csv-controls {
    display: flex;
    gap: 10px;
    margin: 15px 0;
}

#exportTodoCsv,
.todo-import-label {
    flex: 1;
    padding: 10px 15px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    text-align: center;
    min-width: 120px;
}

#exportTodoCsv {
    background-color: #37B24D;
    color: white;
}

#exportTodoCsv:hover {
    background-color: #2F9E44;
    transform: translateY(-2px);
}

#importTodoCsv {
    display: none;
}

.todo-import-label {
    background-color: #845EF7;
    color: white;
}

.todo-import-label:hover {
    background-color: #7048E8;
    transform: translateY(-2px);
}

/* Todo 리스트 */
#todoList {
    list-style: none;
    padding: 0;
    margin-top: 20px;
}

.todo-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background-color: white;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    margin-bottom: 10px;
    transition: all 0.3s ease;
}

.todo-item:hover {
    transform: translateX(5px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.todo-text {
    flex: 1;
    margin-right: 15px;
}

.todo-actions {
    display: flex;
    gap: 8px;
}

.todo-btn-toggle,
.todo-btn-delete {
    padding: 8px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s ease;
    min-width: 70px;
}

.todo-btn-toggle {
    background-color: #4C6EF5;
    color: white;
}

.todo-btn-toggle:hover {
    background-color: #3B5BDB;
}

.todo-btn-delete {
    background-color: #FA5252;
    color: white;
}

.todo-btn-delete:hover {
    background-color: #E03131;
}

/* 반응형 디자인 */
@media screen and (max-width: 768px) {
    #todo {
        padding: 15px;
    }

    #todo h2 {
        font-size: 1.3em;
        margin-bottom: 12px;
    }

    .section-description {
        padding: 15px;
        margin: 12px 0 20px 0;
    }

    .section-description p {
        font-size: 0.95em;
        margin-bottom: 12px;
    }

    .section-description li {
        font-size: 0.9em;
        margin: 6px 0;
        padding-left: 18px;
    }

    .todo-input-group {
        flex-direction: column;
        gap: 8px;
    }

    #todoInput {
        width: 100%;
        padding: 10px;
        font-size: 0.95em;
    }

    #addTodo {
        width: 100%;
        height: 40px;
        font-size: 0.95em;
    }

    .todo-csv-controls {
        flex-direction: column;
        gap: 8px;
    }

    #exportTodoCsv,
    .todo-import-label {
        width: 100%;
        height: 40px;
        font-size: 0.9em;
        min-width: unset;
    }

    .todo-item {
        padding: 12px;
    }

    .todo-text {
        font-size: 0.95em;
    }

    .todo-btn-toggle,
    .todo-btn-delete {
        font-size: 0.85em;
        min-width: 60px;
    }
}

@media screen and (max-width: 480px) {
    #todo {
        padding: 12px;
    }

    #todo h2 {
        font-size: 1.2em;
        margin-bottom: 10px;
    }

    .section-description {
        padding: 12px;
        margin: 10px 0 15px 0;
    }

    .section-description p {
        font-size: 0.9em;
        margin-bottom: 10px;
    }

    .section-description li {
        font-size: 0.85em;
        margin: 5px 0;
        padding-left: 16px;
    }

    #todoInput {
        padding: 8px;
        font-size: 0.9em;
    }

    #addTodo {
        height: 36px;
        font-size: 0.9em;
    }

    .todo-item {
        padding: 10px;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .todo-text {
        margin: 0 0 8px 0;
        font-size: 0.9em;
    }

    .todo-actions {
        flex-direction: row;
        gap: 6px;
    }

    .todo-btn-toggle,
    .todo-btn-delete {
        flex: 1;
        font-size: 0.8em;
        padding: 8px;
        min-width: unset;
    }

    #exportTodoCsv,
    .todo-import-label {
        height: 36px;
        font-size: 0.85em;
        padding: 8px;
    }
}

/* 매우 작은 화면 */
@media screen and (max-width: 360px) {
    #todo h2 {
        font-size: 1.1em;
    }

    .section-description p {
        font-size: 0.85em;
    }

    .section-description li {
        font-size: 0.8em;
        padding-left: 14px;
    }

    .todo-text {
        font-size: 0.85em;
    }

    .todo-btn-toggle,
    .todo-btn-delete {
        font-size: 0.75em;
        padding: 6px;
    }
}

/* 섹션 설명 스타일 개선 */
.section-description {
    background: linear-gradient(145deg, #f8f9fa, #ffffff);
    border-left: 4px solid #4C6EF5;
    border-radius: 8px;
    padding: 20px;
    margin: 15px 0 25px 0;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
}

.section-description p {
    color: #495057;
    font-size: 1em;
    margin-bottom: 15px;
    line-height: 1.6;
}

.section-description ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.section-description li {
    color: #666;
    margin: 8px 0;
    padding-left: 20px;
    position: relative;
    line-height: 1.5;
    font-size: 0.95em;
}

.section-description li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #4C6EF5;
    font-weight: bold;
}